JP4516303B2 - WIRING DESIGN SUPPORT METHOD FOR LINE STRUCTURE, ITS DEVICE, AND ITS PROGRAM - Google Patents

Description

  The present invention relates to a method for supporting wiring design of a wire structure such as a wire harness, an apparatus therefor, and a program therefor.

  In a vehicle or the like, a plurality of electrical components are mounted, and these are the above-described filament structure in which a plurality of wire materials such as electric wires and communication wires are bundled by a binding member such as an insulation lock or an exterior member such as a tape. As a so-called wire harness. As shown in FIG. 1, the wire harness 1 has connectors 2 a, 2 b, 2 c, and 2 d connected to electrical components and the like at each end. In addition, various clips 3a, 3b, 3c, and 3d are attached to the middle portion, and a branch point 4 is further provided. In addition, since each branch line of the wire harness 1 which comprises from each edge part to the branch point 4 is fundamentally different in the number and kind of each constituent line material, the thickness of each branch line, length, elasticity The density is also various. Conventionally, the design for wiring such a wire harness to a vehicle or the like is calculated using general-purpose analysis software called CAD (Computer Aided Design) and CAE (Computer Aided Engineering), or the experience of the designer It was often done by intuition.

Here, documents cited in the present specification are shown below.
B. "Matrix Finite Element Method" by Nath, published by Brain Book Publishing Co., Ltd., August 10, 1978, p. 7-15 Yoshihiko Yasuda, "Mode Analysis and Dynamic Design", published by Corona Co., Ltd., November 10, 1993, p. 54-56

  There are a wide variety of wire structures such as wire harnesses as described above. By simply using the above-mentioned general-purpose analysis software or relying on the experience of the designer, the rigidity to bending and torsion at each part is accurate. It was very difficult to design in anticipation. In other words, since there is no effective design support method and support apparatus, it is often difficult to assemble as designed or become an unrealistic shape. Therefore, conventionally, in order to obtain an optimal wiring shape, design and assembly are repeated by trial and error, and a great deal of time is wasted.

  Therefore, in view of the present situation described above, the present invention provides a wiring design support method, an apparatus thereof, and a program thereof that enable easy and accurate wiring design of a wire structure such as a wire harness. It is said.

The wiring design support method according to claim 1, which has been made to solve the above problem, uses a computer functioning as a drawing means, an outer shape parameter extracting means, a constraint condition extracting means, a non-outer shape parameter calculating means, and a predicted shape calculating means. By modeling the target line structure as an elastic body in which a plurality of beam elements that maintain linearity are combined, and predicting the shape of the line structure using the finite element method A method for supporting optimal wiring design of the line structure, wherein the drawing means draws a line structure of an arbitrary shape according to a manual operation by the drawing means, and the outline parameter extraction means the external parameter is a physical property determined directly contour of linear structure, a contour parameter extraction step of extracting from said rendered linear structure, the constraint extraction The stage, the constraints of the linear structure, a constraint extraction step of extracting from said rendered linear structure, wherein the non-profile parameter calculation means, for calculating the shape prediction by the finite element method A non-outer shape parameter calculation step for calculating a non-outer shape parameter that is a physical characteristic of the linear structure other than the required outer shape parameter based on the outer shape parameter, and the predicted shape calculating means, the constraint condition, the outer shape parameter And a predicted shape calculation step of calculating a predicted shape that is physically balanced by applying the non-outline parameter to the finite element method.

  Further, the wiring design support method according to claim 2, which has been made to solve the above-mentioned problem, is the wiring design support method according to claim 1, wherein the linear structure is formed of a plurality of linear wires by a predetermined exterior member. It is a wire harness in which materials are bundled, and the external parameter includes the type of the exterior member and the thickness of the wire harness, and associates the relationship between the type, the thickness, and the non-external parameter. A characteristic table is stored in advance, and in the non-outline parameter calculation step, the non-outline parameter is calculated by applying the type and the thickness to the characteristic table.

  Further, the wiring design support method according to claim 3, which has been made to solve the above-described problem, is the wiring design support method according to claim 2, wherein the characteristic table includes the type, the thickness, and the non-external parameters. Relationship between longitudinal elastic modulus and transverse elastic modulus, relationship between the type and thickness and longitudinal elastic modulus and Poisson's ratio as the non-external parameter, or transverse elastic modulus as the type and thickness and the non-external parameter And the relationship with the Poisson's ratio.

The wiring design support method according to claim 4, which has been made to solve the above-described problem, is the wiring design support method according to any one of claims 1 to 3, wherein the computer also functions as a warning output unit. When it is impossible to calculate the predicted shape, which is in a physically balanced state, from the linear structure created according to the manual operation by the warning output means, a warning to that effect is given. A warning output step.

Moreover, the wiring design support apparatus for a linear structure according to claim 5, which has been made in order to solve the above-described problem, is an elasticity in which a plurality of beam elements in which linearity is maintained in the target linear structure are combined. It is a device that supports the optimal wiring design of the line structure by predicting the shape of the line structure using a finite element method using a finite element method, and has an arbitrary shape according to manual operation A drawing means for drawing the line structure , an outer shape parameter extracting means for extracting an outer shape parameter, which is a physical characteristic for directly determining the outer shape of the line structure, from the drawn line structure; The constraint condition extracting means for extracting the constraint condition of the line structure from the drawn line structure, and the line structure other than the external parameters necessary for calculation of shape prediction by the finite element method Non-outline parameters that are physical properties of And calculating the predicted shape in a physically balanced state by applying the constraint condition, the outer shape parameter, and the non-outer shape parameter to the finite element method. And a predicted shape calculation means.

A wire structure support program for a line structure according to claim 6, which has been made to solve the above-described problem, is an elasticity in which a plurality of beam elements in which linearity is maintained in a target line structure are combined. In order to support the optimal wiring design of the line structure by predicting the shape of the line structure using a finite element method, the computer may be operated according to manual operation. drawing means for drawing a linear structure shapes, the outer shape parameter is a physical property determined directly contour of linear structure, external shape parameter extracting means for extracting from said rendered linear structure, the line Constraint condition extraction means for extracting the constraint condition of the line structure from the drawn line structure, the physics of the line structure other than the external parameters necessary for calculation of shape prediction by the finite element method Non-outside characteristic Non-external parameter calculation means for calculating parameters based on the external parameters, the constraint conditions, the external parameters, and the non-external parameters are applied to the finite element method to calculate a predicted shape that is physically balanced It is made to function as a predicted shape calculation means to perform.

  According to the first, fifth, and sixth aspects of the present invention, the target line structure is modeled as an elastic body in which a plurality of beam elements that maintain linearity are combined, and the finite element method is used. The shape of the lever line structure is predicted. In addition, physical properties and constraint conditions necessary for the finite element method calculation are automatically calculated from the line structure drawn according to the manual operation, and a predicted shape that is balanced using the finite element method is calculated. Is done.

  According to the invention described in claim 2, the characteristic table in which the relationship between the type of the exterior member, the thickness of the wire harness, and the non-external parameter is stored in advance, and the extracted external parameter is stored in the characteristic table. Is applied to the non-outline parameters.

  According to the invention of claim 3, the relationship between the type of the exterior member and the thickness of the wire harness and the longitudinal elastic modulus and the transverse elastic modulus, the type of the external member and the thickness of the wire harness, the longitudinal elastic modulus and the Poisson's ratio Or the relationship between the type of the exterior member and the thickness of the wire harness, the lateral elastic modulus, and the Poisson's ratio.

  Further, according to the invention described in claim 4, when it is impossible to calculate a predicted shape that is in a physically balanced state from a linear structure created in accordance with a manual operation, that effect Is warned.

  According to the first, fifth and sixth aspects of the invention, since the linear structure is modeled as an elastic body in which a plurality of beam elements having linearity are maintained, a general mesh is assigned. Compared with the finite element model, the amount of calculation is significantly reduced. Therefore, reliable shape prediction in a short time becomes possible. Further, since the data necessary for the calculation of the finite element method is automatically calculated from the line structure drawn according to the manual operation, it is not necessary to input a numerical value for calculating the predicted shape. Therefore, special skill acquisition and skill are not required.

  According to the second aspect of the present invention, a line drawn in response to a manual operation is stored by storing in advance a characteristic table that associates the types of exterior members, the thickness of the wire harness, and the non-external parameters. It is possible to easily and reliably obtain the non-external parameters necessary for the calculation of the finite element method from the strip structure.

  According to the invention described in claim 3, by referring to the characteristic table, the Poisson's ratio, the longitudinal elastic modulus and the transverse elastic modulus necessary for the calculation of the finite element method can be obtained from the linear structure drawn according to the manual operation. Can be obtained easily and reliably.

  According to the invention described in claim 4, when it is impossible to calculate a predicted shape that is in a physically balanced state from a linear structure created according to a manual operation, a warning to that effect is given. Therefore, it is possible to design an accurate route in a shorter time.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the whole shape and typical support member of the wire harness as a linear structure used as object by this invention are demonstrated using FIG.1 and FIG.2. FIG. 1 is a diagram schematically showing the overall shape of a wire harness that is a subject of the present invention. FIG. 2 is a diagram illustrating a relationship between a typical support member attached to the wire harness and a degree of freedom of restraint.

  As described above, the connector 1a, 2b, 2c, and 2d to be connected to electrical components (not shown) are attached to both ends of the wire harness 1 that is the subject of the present invention, and various clips 3a, 3b, and 3c are attached to the middle portion thereof. 3d is attached and further has a branch point 4. Since each branch line of the wire harness 1 basically has a different number and type of constituent wire members, the thickness, length, elasticity, density, and the like of each branch line are also different.

  Each of the connectors 2a, 2b, 2c, and 2d is detachably fixed at a predetermined position according to the fixing position of the mating connector on the electrical component side and the mounting direction thereof, and completely restrains the end of the wire harness. Each of the clips 3a, 3b, 3c, and 3d is completely or rotationally constrained at a predetermined position of the wire harness at a predetermined position such as a vehicle body or a stay.

  Here, the clip will be described. The clip basically includes a long hole clip and a round hole clip. The round hole clip is also called a rotary clip, and is composed of a pedestal portion that holds the wire harness and a support leg that is inserted into a round hole-shaped attachment hole provided in a stay or the like. The round hole clip is rotatable around the Z axis (perpendicular to the attachment site).

  On the other hand, the long hole clip is also called a fixed clip, and is composed of a pedestal portion that holds the wire harness and a support leg that is inserted into a long hole-shaped attachment hole provided in a stay or the like. The cross-sectional shape of the support leg is a long hole shape that is substantially the same as the mounting hole. The long hole clip cannot rotate around the Z axis.

  Further, the long hole clip and the round hole clip include a corrugated long hole clip and a corrugated round hole clip that can rotate around the X axis (longitudinal direction of the wire harness). FIG. 2 shows the degree of freedom of restraint in each axial direction and around each axis of each clip.

  In FIG. 2, the X axis, the Y axis, and the Z axis correspond to three orthogonal axes in the right-hand local coordinate system at each node (or node) on the wire harness. For example, the Z axis coincides with the clip axis, but these determination methods can be appropriately changed depending on the function to be used. In the figure, the degree of freedom of constraint at the branch point is also shown for reference. Further, although not shown here, the nodes on the wire harness arbitrarily set other than the constraint points are basically completely free. Such a degree of freedom of constraint is set for each node prior to calculation of the predicted path, reaction force, etc., as will be described later.

  Next, with reference to FIG. 3 to FIG. 5, an assumption condition, a theory used, and an outline of a basic formula, which are prerequisites in the present invention, will be described. This is common to the first to fifth embodiments. FIG. 3 (A) is a diagram showing the appearance of the wire harness, FIG. 3 (B) is a diagram showing a state where the wire harness of FIG. 3 (A) is discretized, and FIG. It is the figure which represented the wire harness of FIG. 3 (A) with the beam element and the node. FIG. 4 is a diagram for explaining the degree of freedom in the wire harness represented by beam elements and nodes. FIG. 5A is a diagram illustrating the wire harness with three beam elements, and FIG. 5B is a diagram illustrating a state in which the three beam elements in FIG. 5A are coupled.

First, in the present invention, the following assumptions are made when the finite element method is used for designing a wire harness.
(1). The wire harness is assumed to be an elastic body.
(2). Assume that the wire harness is a combination of beam elements.
(3). Assume that each beam element is kept linear.

  Note that assuming a beam element also means that the wire harness is assumed to have a uniform cross section, that is, a homogeneous cross section. Moreover, although the cross section is assumed to be circular, it is not always necessary. However, in the following description, the wire harness will be described assuming a circular cross section.

  In the present invention, by making such an assumption, it becomes possible to apply the finite element method to the wire harness which has not been made conventionally.

  In the present invention, first, the wire harness is discretized. That is, as shown in FIG. 3A, the wire harness 1 in which a plurality of electric wires 11 are bundled by an exterior member such as a tape 12 can be regarded as a continuous body. Next, as shown in FIG. 3B, such a wire harness 1 is divided (discretized) into several beam elements C1, C2, C3,. That is, since the wire harness is like a single rope, it can be considered that a finite number of beam elements are connected.

Therefore, as shown in FIG. 3C, the wire harness can be represented as a plurality of beam elements C1, C2, C3,... Coupled by a plurality of nodes N1, N2, N3,. The characteristic values required for the beam elements are as follows.
Length l (see Fig. 3 (B))
Cross section A (See Fig. 3 (B))
Sectional secondary moment I
Sectional secondary pole moment J (also called torsional resistance coefficient)
Longitudinal elastic modulus E
Transverse elastic modulus G
Although not directly appearing in the above characteristic values, density ρ, Poisson's ratio μ, and the like are also used for obtaining them.

  In the present specification, parameters relating to physical properties that directly determine the outer shape of the linear structure, such as the length l and the cross-sectional area A, are referred to as outer parameters, and other cross-sectional secondary moments I Parameters relating to physical properties such as the cross-sectional secondary pole moment J, the longitudinal elastic modulus E, the transverse elastic modulus G, the density ρ, the Poisson's ratio μ, and the like are referred to as non-external parameters. In the first embodiment, the external shape parameter includes the type of the exterior member.

  As shown in FIG. 4, each beam element C (C1, C2, C3,...) Has two nodes α and β. In the three-dimensional space, the node α has three translation components and three rotation components, and thus has a total of six degrees of freedom. The same applies to the node β. Therefore, the beam element C has 12 degrees of freedom.

In the figure,
F _xi : Nodal force in the xi-axis direction of the i-th element F _yi : Nodal force in the yi-axis direction of the i-th element F _zi : Nodal force in the zi-axis direction of the i-th element M _xi : Around the xi axis of the i-th element End moment (right screw direction is positive)
M _yi : End moment about the yi axis of the i-th element (right screw direction is positive)
M _zi : End moment around the zi-axis of the i-th element (right screw direction is positive)
U _xi : displacement of the i-th element in the xi-axis direction U _yi : displacement of the i-th element in the yi-axis direction U _zi : displacement of the i-th element in the zi-axis direction θ _xi : angular displacement of the i-th element around the xi axis ( (The right screw direction is positive.)
θ _yi : Angular displacement around the yi axis of the i-th element (right screw direction is positive)
θ _zi : Angular displacement around the zi axis of the i-th element (right screw direction is positive)
α is the left node and β is the right node.

By the way, in structural mechanics with large deformation such as a wire harness, the equilibrium equation of the finite element method is generally in the form of the following equation.
([K] + [K _G ]) {x} = {F} (1)
Where [K]: overall stiffness matrix, [K _G ]: overall geometric stiffness matrix, {x}: displacement vector, {F}: load vector (also referred to as force vector)

However, since equation (1) is algebraically a nonlinear simultaneous equation, it cannot be solved as it is in actual numerical analysis. Therefore, an incremental method in which the load values are subdivided and sequentially added is employed (the same applies to forced displacement). Therefore, the equilibrium equation of equation (1) is also expressed in the following incremental form.
([K] + [K _G ]) {Δx} = {ΔF} − {R} (1) ′
Here, {ΔF}: Value of load increment, {Δx}: Incremental displacement in increment step, {R}: Correction vector of load vector

  In each increment interval, the balance equation is calculated as a linear equation, and the resulting unbalance force (vector {R} in equation (1) ′) is made to an allowable range by an iterative method before proceeding to the next step. Will be reduced. As a series of these algorithms, for example, a known method such as Newton-Raphson method or arc length method is used.

Note that when forced displacement is specified as in shape prediction, it is often benign to omit the overall geometric stiffness matrix [K _G ] in the second term from the left side of the equilibrium equation. Yes.

  Further, the overall stiffness matrix [K] in the first term on the left side is obtained by converting the stiffness matrix of each element that can be rewritten while changing the coordinate value every moment in each incremental step into the overall coordinate system and tabulating. The specific expression content of the basic element stiffness matrix is the following expression (2).

  Here, the matching condition and the balancing condition will be described. Here, for the sake of simplicity, as shown in FIG. 5A, the wire harness is represented by three beam elements C1, C2, and C3. In this case, the displacements of the node 1β of the beam element C1 and the node 2α of the beam element C2 are equal, and the forces applied to these nodes are also balanced. Similarly, the displacements of the node 2β of the beam element C2 and the node 3α of the beam element C3 are also equal, and the forces applied to these nodes are also balanced. Therefore, the beam elements C1 and C2 and the beam elements C2 and C3 can be coupled as shown in FIG. 5B by satisfying the condition of the balance between the continuity of the displacement and the force.

In the figure,
F _xi : Nodal force in the xi-axis direction of the i-th element F _yi : Nodal force in the yi-axis direction of the i-th element F _zi : Nodal force in the zi-axis direction of the i-th element M _xi : Around the xi axis of the i-th element End moment M _yi : End moment of the i-th element around the yi axis M _zi : End moment of the i-th element around the zi axis U _xi : Displacement of the i-th element in the xi-axis direction U _yi : Y-axis direction of the i-th element U _zi : Displacement of the i-th element in the zi-axis direction θ _xi : Angular displacement of the i-th element around the xi axis θ _yi : Angular displacement of the i-th element around the yi axis θ _zi : Around the zi-axis of the i-th element Indicates the angular displacement of
i = 1α, 1β, 2α, 2β, 3α, 3β.

  Then, when the continuity of the displacement and the balance of force in the beam elements C1, C2, and C3 shown in FIG. 5B are shown in the same form as the above equation (2), the following equation (3) is obtained. Become.

  Here, the matrixes M1, M2, and M3 of 12 rows and 12 columns in the formula (3) are the same as those shown in the formula (2). However, the portions M12 and M23 where the matrices M1, M2 and M3 are overlapped are the components of each matrix added together.

  In addition, it can handle similarly about four or more beam elements. In this manner, a mathematical model of a wire harness that is divided into an arbitrary number of beam elements can be created.

By the way, when the above formula (3) is simply expressed,
[K] {x} = {F} (4)
It becomes.

  Therefore, the path, that is, the shape of the wire harness can be calculated by obtaining each element of the displacement vector {x} based on the above (3) and formula (4). Conversely, by obtaining the force vector {F} at each node, that is, strain, stress, reaction force, moment, etc. can be calculated. Furthermore, the natural frequency and the natural vibration mode can also be calculated by calculating the natural value as described later. The general matrix finite element method as described above is also introduced in Non-Patent Document 1, for example.

  Next, an example of how to obtain the Poisson's ratio, the longitudinal elastic modulus and the transverse elastic modulus necessary for shape prediction in the present invention will be shown below. FIG. 6A is a diagram illustrating a state in which the cross-sectional secondary moment and the longitudinal elastic modulus are measured, and FIG. 6B is a diagram illustrating a state in which the cross-sectional secondary polar moment and the transverse elastic modulus are measured. . FIG. 7 is a diagram illustrating an example of the characteristic table.

The longitudinal elastic modulus E can be expressed by the following equation (5) when the measurement method shown in FIG.
^{E = FL 3 / 3XI ... (} 5)
Moreover, since the wire harness is assumed to have a circular cross section as described above, the cross sectional secondary moment I can be expressed by the following equation (6).
^{I = πD 4/64 ... (} 6)
Therefore,
E = 64FL ³ / 3XπD ⁴ (7)
It becomes.
In this measurement,
E = (F / X) × (64L ³ / 3πD ⁴ )
As a result, the longitudinal elastic modulus E can be obtained by measuring the relationship between F and x.

  By the way, in this invention, the longitudinal elastic modulus E is calculated | required for every kind of exterior member and the thickness of a wire harness. That is, as shown in FIG. 7, W / H (wire harness) diameter 1-5, W / H diameter 6-10 for exterior types such as no exterior, tape winding 1, tape winding 2,. , W / H diameter 11-15,..., Etc., the longitudinal elastic modulus E is obtained as described above for each thickness of the wire harness. 7, values such as 10, 12,... Are values of the longitudinal elastic modulus E of the wire harness corresponding to the predetermined exterior type and the W / H diameter.

  In FIG. 7, the term “without exterior” refers to a wire harness without an exterior member such as an insulation lock or tape. The tape winding 1 indicates, for example, a wire harness in which a predetermined type of tape is roughly wound, and the tape winding 2 indicates, for example, a wire harness in which a predetermined type of tape is half-wrapped. In addition to this, although not shown in FIG. 7, various exterior types are assumed depending on combinations of winding methods such as double half wrap and sushi winding, tape types, and winding thicknesses.

  In FIG. 7, W / H diameter 1-5, W / H diameter 6-10, and W / H diameter 11-15 represent the thickness of each wire harness in millimeters. As described above, the longitudinal elastic modulus E is obtained as described above for all combinations of realistic exterior types and W / H diameters, and is stored in a database.

On the other hand, the transverse elastic modulus G can be expressed by the following equation (8) when the measurement method shown in FIG.
G = (TL / θJ) × 2 (8)
The cross-section secondary pole moment J can be expressed by the following equation (9) because the wire harness is assumed to have a circular cross section.
^{J = πD 4/32 ... (} 9)
The twisting force is
T = FS (10)
It becomes.
Therefore,
G = (32FSL / θπD ⁴ ) × 2 = (F / θ) (32SL / πD ⁴ ) × 2 (11)
Therefore, the transverse elastic modulus G can be obtained by measuring the relationship between F and θ.

  Similarly to the longitudinal elastic modulus E, the transverse elastic modulus G can be obtained for each type of exterior member and each thickness of the wire harness. In this case, each value in FIG. 7 is the transverse elastic modulus G of the wire harness corresponding to the predetermined exterior type and the W / H diameter. Then, the lateral elastic modulus G is obtained as described above and stored in a database for all possible combinations of exterior types and W / H diameters.

However, the transverse elastic modulus G and the longitudinal elastic modulus E have a relationship as shown in the following equation (12).
G = E / 2 (1 + μ) (12)
Here, μ: Poisson ratio is shown.

  Therefore, the lateral elastic modulus G is derived from the equation (12) including the longitudinal elastic modulus E and the Poisson ratio μ by previously creating a database of the types of exterior members and the relationship between the thickness of the wire harness and the Poisson ratio μ. It is also possible to do. Conversely, the longitudinal elastic modulus E can be derived from the transverse elastic modulus G and Poisson's ratio μ. That is, the relationship between the type of the exterior member and the thickness of the wire harness and the longitudinal elastic modulus E and the transverse elastic modulus G, or the relationship between the type of the exterior member and the thickness of the wire harness, the longitudinal elastic modulus E and the Poisson's ratio μ, or If any of the types of exterior members, the thickness of the wire harness, and the relationship between the transverse elastic modulus G and the Poisson's ratio μ is stored in a database, the longitudinal elastic modulus E and the transverse elastic modulus G can be obtained. The above measurement method is an example, and each value of the transverse elastic modulus G and the longitudinal elastic modulus E may be obtained by a method other than the above measurement example.

  In addition, since the cross-sectional shape of the wire harness may not necessarily be a complete circle, the cross-sectional shape and parameters (for example, the vertical and horizontal sizes if rectangular), the above-described longitudinal elastic modulus E, transverse elastic modulus G, Poisson's ratio If the relationship with μ is made into a database, versatility is further enhanced.

  Next, a hardware configuration according to the present invention that supports the design by calculating and outputting the predicted shape of the wire harness according to the processing procedure described later using the theory, the basic formula, and the measured value will be described. FIG. 8 is a block diagram showing a hardware configuration according to all the embodiments of the present invention.

  As shown in FIG. 8, in the present invention, a microcomputer 21, an input device 22, a display device 23, a printing device 24, a storage device 25, a communication interface 26, and a read / write device 27 are configured. Is used. Needless to say, a desktop computer or a super computer other than a personal computer may be used. The microcomputer 21 includes a CPU 21a (central processing unit), a ROM 21b that stores a boot program and the like, and a RAM 21c that temporarily stores various processing results. The input device 22 is a keyboard, mouse or the like for inputting the above values, the display device 23 is an LCD or CRT for displaying the processing results, and the printing device 24 is a printer for printing the processing results.

  In addition, the storage device 25 stores the characteristic table 25a having the contents as shown in FIG. 7 (in the case of the first embodiment), the installed wiring design support program 29a (in the case of the first to fifth embodiments), and the processing by this program 29a. The communication interface 26 is, for example, a modem board for performing data communication with an external device using the Internet, a LAN line, or the like. The read / write device 27 is a device that reads a wiring design support program 29 a according to the present invention stored in a recording medium 29 such as a CD or a DVD, and writes a calculation result by the wiring design support program 29 a to the recording medium 29. Each of these components is connected via an internal bus 28.

  The microcomputer 21 installs the wiring design support program 29 a read by the read / write device 27 in the storage device 25. When the power is turned on, the microcomputer 21 is activated in accordance with the boot program stored in the ROM 21b and starts up the installed wiring design support program 29a. Then, the microcomputer 21 performs processing related to shape prediction according to the wiring design support program 29a, outputs the processing result from the display device 23 or the printing device 24, and outputs the processing result to the storage device 25 or the recording medium 29. Save it. In the case of the first embodiment, the characteristic table 25a is referred to when predicting the shape. The wiring design support program 29a can be installed in another personal computer or the like having the above basic configuration, and after the installation, the computer is caused to function as a wiring design support device. The wiring design support program 29a may be provided not only via the recording medium 29 but also via a communication line such as the Internet or a LAN.

[Embodiment 1]
As described above, the shape prediction or path design of the wire harness may be performed by a combination with general-purpose analysis software called CAD and CAE. In this case, conventionally, after drawing and drawing the detailed shape of the wire harness reflecting the thickness, length, type, etc. of the wire using CAD, the necessary data is numerically input to a predetermined general purpose CAE and predicted shape After evaluating the calculation result, the predicted shape is drawn again using CAD. Conventionally, such a cycle has been repeated on a trial and error basis by designers who are familiar with operations such as CAD and general-purpose CAE.

  However, since CAD and general-purpose CAE are separated by software, it is necessary to frequently input numerical values necessary for general-purpose CAE. In addition, the operation of inputting necessary numerical values is complicated, and it takes a lot of time to acquire the technology for mastering general-purpose CAE. Furthermore, according to the general-purpose CAE, there is a problem that the lead time for simulating the deformation of the wire harness, that is, the time required for shape prediction becomes very long. Therefore, in the first embodiment, in particular, these problems are solved so that an optimal wiring design of a linear structure such as a wire harness can be easily and accurately performed.

  A processing procedure according to the first embodiment will be described with reference to FIGS. FIG. 9 is a flowchart showing a main processing procedure according to the present invention, which is performed using the hardware configuration shown in FIG. FIG. 10 is a flowchart showing a non-outline parameter calculation subroutine in the main processing procedure of FIG. FIG. 11A to FIG. 11E are diagrams illustrating states in which the wire harness is deformed in each processing step of FIG. 9.

First, in step S1 shown in FIG. 9, according to a manual operation of a mouse or the like, that is, a manual operation using a mouse and input means equivalent thereto (hereinafter referred to as “manual operation” in this specification). A wire harness of an arbitrary shape is drawn. This step S1 is the same as the design and drawing method using the well-known CAD. That is, a mouse or the like as the input device 22 is used for the shape of the wire harness in a straight state on the display device 23 as shown in 1a of FIG. The end is displaced from 1a5 to 1b5. And the shape of the wire harness of desired length and thickness as shown to 1b of the same figure is drawn on the assumption that it arranges in the predetermined | prescribed three-dimensional space in a vehicle (in fact, For example, in the image as shown in FIG. At this time, drawing is performed so that the exterior type described with reference to FIG. 7 can also be discriminated (actually, for example, with an image as shown in FIG. 3A). A support member such as a clip is also drawn. Here, for the sake of simplicity, it is assumed that only the end portion indicated by 1a1 is completely restrained and the end portion indicated by 1a5 is displaceable. The other sites are completely free.

  In addition, the site | part shown by 1a1-1a5 in FIG. 11 (A) is represented as what this wire harness was couple | bonded with several beam elements, and respond | corresponds to the typical node assigned when modeled. It is a part. The portions corresponding to the respective portions indicated by 1a1 to 1a5 are represented by 1b1 to 1b5, 1c1 to 1c5, 1d1 to 1d5, and 1e1 to 1e5 in FIGS. 11 (A) to 11 (E). Step S1 corresponds to a drawing step and drawing means in the claims. Note that the wire harness drawn in advance by CAD or the like may be stored, read out as needed, and proceed to the subsequent processing.

  Subsequently, in step S2, external parameters are extracted from the shape 1b of the wire harness drawn in step S1. Specifically, the type of the exterior member, the thickness of the wire harness, the length thereof, and the like are extracted from the shape 1b. These are temporarily stored in the work area of the RAM 21c for later processing. Step S2 corresponds to the outer shape parameter extracting step and the outer shape parameter extracting means in the claims.

  Subsequently, in step S3, a non-outline parameter is calculated from the shape 1b of the wire harness drawn in step S1. Here, the non-external parameters are the cross-sectional area A, the cross-sectional secondary moment I, the cross-sectional secondary pole moment J, the longitudinal elastic modulus E, and the transverse elastic modulus G included in each element of the stiffness matrix [K]. Step S3 corresponds to the non-external parameter calculation step and the non-external parameter calculation means in the claims.

  Specifically, in the calculation of the non-outline parameter in step S3, as shown in FIG. 10, first, in step S31, the cross-sectional area A is calculated. This cross-sectional area A can be calculated from the thickness of the wire harness extracted in step S2.

  Next, in step S32, the sectional secondary moment I is calculated. This cross-sectional secondary moment I can be calculated according to the cross-sectional area A calculated in step S31 and the above equation (6). Next, in step S33, the cross-sectional secondary pole moment J is calculated. This cross-sectional secondary pole moment J can be calculated according to the cross-sectional area A calculated in step S31 and the above equation (9).

  Next, in step S34, the longitudinal elastic modulus E is acquired by referring to the characteristic table 25a stored in advance in the storage device 25. That is, by referring to the characteristic table 25a, the longitudinal elastic modulus E according to the type of the exterior member extracted in step S2 and the thickness of the wire harness can be easily and reliably acquired.

  In step S35, the characteristic table 25a is referred to and the lateral elastic modulus G is acquired. That is, the longitudinal elastic modulus E corresponding to the type of the exterior member extracted in step S2 and the thickness of the wire harness can be acquired. Of course, as described above, the longitudinal elastic modulus E may be derived using the equation (12).

  When the calculation of such non-outline parameters is completed, extraction of constraint conditions is subsequently performed in step S4. The constraint condition is the type of constraint (complete constraint, rotational constraint, complete freedom, etc.) as shown in FIG. 2 at each assigned node, and particularly important are the coordinates of the end portion 1b1 to be completely constrained, m1 This is the end 1b5 of the displacement destination due to. Each value set here relates to each element in the displacement vector {x} in the above equation (3). Step S4 corresponds to the constraint condition extraction step and the constraint condition extraction means in the claims.

  Subsequently, in step S5, a predicted shape is calculated using a finite element method. That is, since the shape 1b of the wire harness shown in FIG. 11A is simply drawn using CAD, it is physically balanced so as to satisfy the above physical characteristics and constraint conditions. Since it is not necessarily in a state, a predicted shape that is in a balanced state as shown by 1c in FIG. 11B is calculated using the finite element method. Step S5 corresponds to the predicted shape calculation step and the predicted shape calculation means in the claims.

  In the calculation using the finite element method, the wire harness is modeled as a combination of a plurality of beam elements as in the above equation (3), and the physical characteristics such as the external parameters and the non-external parameters are Constraints are applied and unknowns in this model are calculated. That is, when an unknown number in the displacement vector {x} is calculated, a balanced shape of the wire harness as shown in 1c is obtained.

  However, there may be a case where a solution that satisfies the physical characteristics and the constraint conditions cannot be obtained. That is, it may be impossible to calculate a predicted shape that is physically balanced as shown in 1c. Assuming such a case, in step S6, the success / failure of the predicted shape calculation is determined.

  If it is determined in step S6 that the predicted shape calculation has been successful (Y in step S6), the process proceeds to step S7, for example, instead of the shape indicated by 1b being drawn, the predicted shape indicated by 1c is drawn. . That is, when the end of the wire harness is displaced by the input device 22, the shape physically balanced by the finite element method is automatically calculated and redrawn. That is, following a shape design by a known operation by CAD, a physically balanced shape is automatically calculated and drawn in the background.

  On the other hand, if it is determined in step S6 that the predicted shape calculation is unsuccessful (N in step S6), the process proceeds to step S8, and a warning to that effect is output. This warning may be displayed as characters on the display device 23, or an alarm sound may be emitted by a sounding device (not shown). In this case, the shape of the wire harness being drawn indicated by 1b remains displayed on the display device 23. In this way, when it is impossible to calculate a predicted shape that is in a physically balanced state, a warning to that effect is given, so that an accurate route design in a shorter time becomes possible. Step S8 corresponds to the warning output step and the warning output means in the claims.

  Subsequently, in step S9, it is determined whether or not the shape has been changed according to the manual operation. For example, since an obstacle such as an electrical component exists on the predicted shape indicated by 1c, the input device 22 is operated and the end portion is displaced from 1c5 to 1d5 as indicated by m2 in FIG. 11C. Shall be. If it does so, it will return to step S4 (Y of step S9), and a new restraint condition will be extracted. That is, the coordinates of the end 1c5 are updated to the coordinates of the end 1d5. Then, the process proceeds to step S5, and the calculation using the finite element method is performed again, and a shape satisfying a new constraint condition as shown in 1e of FIG. 11D is calculated.

  Then, as shown in FIG. 11E, the shape of the wire harness shown in 1e is drawn on the display device 23 instead of the shape shown in 1d. Of course, if there is a shape change according to the manual operation again for some reason, the processing of steps S4 to S8 is repeated. When it is determined that there is no shape change according to the manual operation (N in step S9), a series of processing ends. At the end, the predicted shape 1e may be stored in a hard disk or the like as the storage device 25, or may be printed on paper from the printing device 24.

  In the above embodiment, the nodes other than the end portions are completely free, but the predicted shape may be calculated in consideration of the influence of gravity. The influence of gravity is related to each element in the force vector {F} in the above equation (3).

  As described above, according to the first embodiment, the wire harness is modeled as an elastic body in which a plurality of beam elements that maintain linearity are combined, so that the amount of calculation is greatly reduced, and in a short time. It is possible to reliably predict the shape. Moreover, since the data required for the calculation of the finite element method is automatically calculated from the wire harness drawn according to the manual operation, it is not necessary to input a numerical value for calculating the predicted shape. Therefore, special skill acquisition and skill are not required. The first embodiment corresponds to the first to sixth aspects.

[Embodiment 2]
A processing procedure according to the second embodiment will be described with reference to FIGS. 12 and 13. FIG. 12 is a flowchart illustrating a processing procedure according to the present embodiment performed using the hardware configuration illustrated in FIG. 8. FIG. 13A to FIG. 13F are diagrams illustrating output results in the course of each process shown in FIG.

  First, based on the initial value set in step S1 shown in FIG. 12, an initial shape is calculated in step S2, and in step S3, the calculated initial shape 33 is output as shown in FIG. 13B. The As initial values for obtaining this initial shape 33, for example, as shown in FIG. 13A, restraint positions 31a and 31z to which connectors at both ends of the wire harness to be designed are attached, restraint directions 32a and 32z, and The minimum bending radius or the like of this wire harness is used, and the initial shape 33 that is a curve having a bending radius larger than the minimum bending radius or the like passes through the constraint position in the constraint direction. You may make it also use the coordinate of a clip, the restraint direction, etc. to be attached. Note that the minimum bending radius is a value that depends on the material characteristics of the wire harness, and it may be assumed that the normal bending force of the operator who performs the assembly work of the wire harness cannot be bent to the minimum bending radius. Therefore, it is more practical to obtain the initial shape 33 by using a bending radius that can be bent with the normal force of the operator, rather than the minimum bending radius. The bending radius is slightly larger than the minimum bending radius depending on the material characteristics, and can be obtained in advance by a test or the like for each typical wire harness. In addition, the “bending radius” in the following (b1) to (b9) includes both the bending radius depending on the material characteristics and the operator's force. Further, the restraining direction is a specific direction in which the direction in which the wire harness extends from the restraining position is restricted or restrained by the support member. The method for obtaining the initial shape 33 is not limited to such a method, and other methods may be used. The shape calculation process is performed by the microcomputer 21, and the input device 22 is used to set the initial value, and the display device 23 is used to output the initial shape. Also in the subsequent processing, the shape calculation processing is performed by the microcomputer 21, the input device 22 is used for setting each value, and the display device 23 is used for outputting the calculation result. Step S2 and related hardware correspond to the first calculation means in the following (b1) to (b9).

  Next, in step S4, the nodes 31a to 31z as shown in FIG. 13C are assigned to the output initial shape 33, and the nodes 31a to 31z are forcibly displaced. Each constraint condition is set. As the constraint condition, a constraint type (complete constraint, rotational constraint, complete freedom, etc.) as shown in FIG. 2 for each node 31a to 31z, local coordinates, and the like are set. These constraint conditions correspond to the displacement destination. As each of the nodes 31a to 31z, a part to which a support member such as a connector or a clip is attached is assigned. In addition, as shown in FIG. 2, support member names such as connectors and clips may be used for setting the constraint type. Each value set here relates to each element in the displacement vector {x} in the above equation (3).

  At the same time, in step S4, the external parameters and non-external parameters of the predicted wire harness are also set. The length l and the cross-sectional area A are set as the external parameters, and the non-external parameters are the secondary moment I of the cross section, the secondary pole moment J, the Poisson's ratio μ, the density ρ, the longitudinal elastic modulus E, and the transverse elastic modulus. G is set. For these, values measured or calculated in advance as described above are used. The value set here relates to each element in the stiffness matrix [K] in the above equation (3). Step S4 and related hardware correspond to setting means in the following (b1) to (b9). Further, the outer shape parameter and the non-outer shape parameter correspond to the physical characteristics in the following (b1) to (b9).

  When the setting of each value is completed, the process proceeds to step S5, and the currently displayed path shape is deleted. Next, in step S6, a finite element method is applied to calculate a new predicted shape. That is, in step S6, each value set in step S4 is applied to the above equation (3), and each unknown in the above equation (3) is calculated. Specifically, when the unknown number of the displacement vector {x} in Equation (3) is calculated, a new predicted shape of the wire harness is obtained. Step S5 and related hardware correspond to the calculation means and the second calculation means in the following (b1) to (b9).

  Next, in step S7, as shown in FIG. 13D, the calculated new predicted shape 35 is displayed. It should be noted that the nodes 31b ', 31c', 31d ', and 31e' of the new predicted shape 35 shown in FIG. 13D are respectively connected to the nodes 31b, 31c, 31c in the initial shape 33 shown in FIG. It corresponds to 31d and 31e. Here, the positions of the nodes 31a and 31z are not moved, and the other nodes are forcibly displaced. Step S7 and related hardware correspond to the output means in the following (b1) to (b9). In addition, the output described in the following (b1) to (b9) is not limited to the display by the display device 23, and includes printing by the printing device 24 and the like.

  Next, in step S8, it is determined whether or not the set value has been changed. For example, as shown in FIG. 13E, if it is determined that the new predicted shape 35 interferes with the obstacle 36 caused by various electrical components or stays as a result of the forced displacement, for example, a new The bending radius, the position to be forcibly displaced, and the like are reset using the input device 22 and the like. The elements to be reset and changed are not limited to these, and may be other elements in the formula (3). If it is determined that the set value has been changed, the process returns to step S5 to calculate the next new predicted shape (Y in step S8).

  When returning to step S5 to step S7, the next new predicted shape is calculated and displayed. Such a verification process is repeated, and for example, a predicted shape 37 that satisfies the given condition is displayed while avoiding the obstacle 36 as shown in FIG. When a predicted shape that satisfies the predetermined set value is obtained, the series of processes is terminated (N in step S8). Steps S8 and S5 to S7 correspond to verification means in the following (b1) to (b9).

  As described above, according to the second embodiment, it is possible to always obtain a predicted shape of a linear structure such as a wire harness with stable accuracy without depending on the skill level of the designer. Therefore, the optimal wiring design of the line structure can be easily and accurately performed. In particular, according to the present embodiment, the present invention can be applied to a wire harness that changes thickness and rigidity, and a wire harness having a branch point, which has conventionally been difficult to design accurately. In addition, the present embodiment has a great influence on the path shape of the wire harness, and is also useful when considering the optimum path shape by arbitrarily changing the constraint point, the constraint direction, etc., which are the main points of the design. .

  The technical ideas (b1) to (b9) that can be grasped from the second embodiment will be described below together with the effects thereof.

  In the wiring design support method for a linear structure of (b1), the target linear structure is regarded as an elastic body in which a plurality of beam elements that maintain linearity are combined, and using a finite element method, A method for supporting optimal wiring design of the linear structure by predicting and outputting the shape of the linear structure satisfying a predetermined condition, wherein the physical property of the linear structure as the predetermined condition Applying characteristics and constraint conditions to the finite element method, calculating a predicted shape when the linear structure is forcibly displaced so as to satisfy this condition, and outputting the calculation result, To do.

  Further, the wiring design support method for a linear structure in (b2) uses the finite element method by regarding the target linear structure as an elastic body in which a plurality of beam elements having linearity are connected. Predicting and outputting the shape of the linear structure satisfying a predetermined condition, thereby supporting optimal wiring design of the linear structure, the linear structure set as an initial value An initial shape of the filament structure is calculated based on a predetermined bending radius of the object, a constraint position, and a constraint direction with respect to the filament structure at the constraint position, and the initial shape of the filament structure is calculated with respect to the initial shape. Given physical properties and constraint conditions, using the finite element method, calculate the predicted shape when the linear structure is forcibly displaced so as to satisfy the given condition, and output the calculation result It is characterized by.

  Further, the wiring design support method for the line structure of (b3) is the change of the physical characteristics and the constraint condition with respect to the output predicted shape in the wiring design support method of (b1) or (b2). The information about the finite element method is used, the predicted shape when the linear structure is forcibly displaced is calculated again, the calculation result is output again, and the optimal linear structure It is possible to verify the shape of the image.

  Moreover, the wiring design support method for a linear structure in (b4) is the wiring design support method for a linear structure in any one of (b1) to (b3), in which the linear structure is applied to a vehicle. It is a wire harness to be wired, and the constraint condition is a coordinate of each vertex of the plurality of beam elements and a degree of freedom at each vertex, and the physical characteristics are a cross-sectional area, a length, a cross-section of the linear structure It is a value based on secondary moment, cross-sectional secondary pole moment, density, Poisson's ratio, longitudinal elastic modulus and transverse elastic modulus.

  Further, the wiring design support device for a linear structure in (b5) regards the target linear structure as an elastic body in which a plurality of beam elements having linearity are combined, and uses a finite element method. Predicting and outputting the shape of the linear structure satisfying a predetermined condition, thereby supporting an optimal wiring design of the linear structure, wherein the linear structure as the predetermined condition A setting means for setting the physical characteristics and the constraint condition, and applying the predetermined condition to the finite element method to calculate a predicted shape when the linear structure is forcibly displaced to satisfy the condition And output means for outputting the predicted shape calculated by the calculation means.

  In addition, the wiring structure support device for a linear structure in (b6) regards the target linear structure as an elastic body in which a plurality of beam elements that maintain linearity are combined, and uses a finite element method. Predicting and outputting the shape of the linear structure satisfying a predetermined condition, thereby supporting an optimal wiring design of the linear structure, the linear structure set as an initial value A first calculating means for calculating an initial shape of the filament structure based on a predetermined bending radius of the object, a constraint position, and a constraint direction with respect to the filament structure at the constraint position; A setting means for setting physical properties and constraint conditions of the line structure, and a predicted shape when the line structure is forcibly displaced so as to satisfy the set condition by using the finite element method. Second calculating means for calculating and second calculating means An output means for outputting the predicted shape calculated Te characterized in that it comprises a.

  In addition, the wiring structure support device for a linear structure in (b7) is the wiring structure support device for a linear structure in (b5) or (b6) with respect to the predicted shape output by the output means. , Giving information on the change of the physical characteristics and the constraint conditions, using the finite element method, recalculating the predicted shape when the linear structure is forcibly displaced, and outputting the calculation result to the output It is further characterized by further comprising verification means for causing the means to output again and enabling verification of the optimum shape of the linear structure.

  Further, the wiring design support program for a linear structure in (b8) considers the target linear structure as an elastic body in which a plurality of beam elements having linearity are connected, and uses a finite element method. In order to support the optimal wiring design of the line structure by predicting and outputting the shape of the line structure satisfying a predetermined condition, the computer uses the line structure as the predetermined condition. Setting means for setting physical properties and constraint conditions of an object, calculation for calculating a predicted shape when the linear structure is forcibly displaced so as to satisfy the condition by applying the predetermined condition to the finite element method And an output means for outputting the predicted shape calculated by the calculating means.

  In addition, the wiring structure support program for a linear structure in (b9) regards the target linear structure as an elastic body in which a plurality of beam elements having linearity are connected, and uses a finite element method. In order to support optimal wiring design of the line structure by predicting and outputting the shape of the line structure satisfying a predetermined condition, a computer is set as the initial value. A first calculating means for calculating an initial shape of the filament structure based on a predetermined bending radius of the structure, a constraint position, and a constraint direction with respect to the filament structure at the constraint position; A setting means for setting physical properties and constraint conditions of the line structure, and using the finite element method, a predicted shape when the line structure is forcibly displaced so as to satisfy the set condition is calculated. Second calculating means, Output means for outputting the predicted shape calculated by the calculating means to function as, and wherein the.

  According to (b1), (b5) and (b8), the finite element method is given the physical characteristics and constraint conditions of the linear structure, and the linear displacement is forced so that the linear structure satisfies these physical characteristics and constraint conditions. The shape of the line structure predicted when it is done is output.

  Further, according to (b2), (b6), and (b9), first, the initial shape is calculated based on the restraint position, restraint direction, and predetermined bending radius of the linear structure set as the initial values. Furthermore, the physical properties and restraint conditions of the linear structure are given to the initial shape, and the filaments predicted when the linear structure is forcibly displaced so as to satisfy the physical properties and the restraint conditions are given. The shape of the structure is output.

  In addition, according to (b3) and (b7), the output predicted shape is given information on changes in physical properties and constraint conditions, and the linear structure is forcibly displaced using the finite element method. The predicted shape is calculated again, and the calculation result is output again, so that the optimum shape of the line structure can be verified.

  Further, according to (b4), the constraint condition is the coordinates of a plurality of nodes and the degree of freedom of constraint at each node, and the physical characteristics are cross-sectional area, length, cross-sectional secondary moment, cross-sectional secondary pole moment, density, The values are based on Poisson's ratio, longitudinal elastic modulus and transverse elastic modulus.

[effect]
According to (b1), (b5) and (b8), the finite element method is given the physical characteristics and constraint conditions of the linear structure, and the linear displacement is forced so that the linear structure satisfies these physical characteristics and constraint conditions. The shape of the line structure predicted when it is done is output. By using the finite element method in this way, it is possible to always obtain a predicted shape of the linear structure with stable accuracy without depending on the skill level of the designer. Therefore, the optimal wiring design of the line structure can be easily and accurately performed.

  Also, according to (b2), (b6) and (b9), first, the initial shape is calculated based on the restraint position, restraint direction and predetermined bending radius of the linear structure set as the initial value. An approximate line structure can be obtained immediately. Furthermore, the physical properties and restraint conditions of the linear structure are given to the initial shape, and the filaments predicted when the linear structure is forcibly displaced so as to satisfy the physical properties and the restraint conditions are given. Since the shape of the structure is output, it is possible to always obtain the predicted shape of the linear structure with stable accuracy without depending on the skill level of the designer. Therefore, the optimal wiring design of the line structure can be performed more easily and accurately.

  In addition, according to (b3) and (b7), the output predicted shape is given information on changes in physical properties and constraint conditions, and the linear structure is forcibly displaced using the finite element method. The predicted shape is calculated again, and the calculation result is output again, so that the optimal shape of the linear structure can be verified. Therefore, the optimal wiring design of the linear structure is more accurate. Will be able to do.

  Further, according to (b4), the constraint condition is the coordinates of a plurality of nodes and the degree of freedom of constraint at each node, and the physical characteristics are cross-sectional area, length, cross-sectional secondary moment, cross-sectional secondary pole moment, density, The values are based on the Poisson's ratio, the longitudinal elastic modulus, and the transverse elastic modulus, and all of these values can be obtained in advance from the wire harness wired to the vehicle. Therefore, a realistic and accurate route that assumes actual assembly work. Can be considered.

[Embodiment 3]
A processing procedure according to the third embodiment will be described with reference to FIGS. 14 and 15. FIG. 14 is a flowchart showing a processing procedure according to the present embodiment performed using the hardware configuration shown in FIG. FIGS. 15A to 15D are diagrams each illustrating an output result in the process of each process illustrated in FIG. 14.

  First, based on the initial value set in step S1 shown in FIG. 14, the initial shape is calculated in step S2, and in step S3, the calculated initial shape 1a is output as shown in FIG. The As an initial value for obtaining this initial shape 1a, for example, the positions at which connectors at both ends of the target wire harness (corresponding to the positions of nodes 1a1 and 1a8 in the figure) are attached are used. The operator bends with normal force when assembling the restraint direction, the coordinates and restraint direction of the clip attached to the middle part of this wire harness, or the minimum bending radius or wire harness depending on the material properties of this wire harness. A bending radius or the like that can be used may be used. In any case, it is preferable to output the initial shape reflecting the shape before the assembly of the target wire harness. The shape calculation process is performed by the microcomputer 21, and the input device 22 is used to set the initial value, and the display device 23 is used to output the initial shape. Also in the subsequent processing, the shape calculation processing is performed by the microcomputer 21, the input device 22 is used for setting each value, and the display device 23 is used for outputting the calculation result.

  Next, in step S4, nodes 1a1 to 1a8 as shown in FIG. 15B are assigned to the output initial shape 1a, and predetermined constraint conditions at these nodes 1a1 to 1a8 are set. Is done. As the constraint condition, a constraint type (complete constraint, rotational constraint, complete freedom, etc.) as shown in FIG. 2 for each of the nodes 1a1 to 1a8, local coordinates, and the like are set. These constraint conditions correspond to the displacement destination. As each of the nodes 1a1 to 1a8, a part to which a support member such as a connector or a clip is attached is assigned. In addition, as shown in FIG. 2, the name of a support member such as a connector or a fixing clip may be used for setting the constraint type. Each value set here relates to each element in the displacement vector {x} in the above equation (3).

  At the same time, in step S4, the external parameters and non-external parameters of the predicted wire harness are also set. The length l and the cross-sectional area A are set as the external parameters, and the non-external parameters are the secondary moment I of the cross section, the secondary pole moment J, the Poisson's ratio μ, the density ρ, the longitudinal elastic modulus E, and the transverse elastic modulus. G is set. For these, values measured or calculated in advance as described above are used. The value set here relates to each element in the stiffness matrix [K] in the above equation (3).

  Furthermore, in step S4, as shown in FIG. 15B, a force f applied to a predetermined portion of the wire harness, for example, a node 1a8 corresponding to a position where the connector is attached may be set. This force f is based on, for example, the movement of the worker expected at the time of assembly. The value set here relates to each element in the force vector [f] in the above equation (3). By setting the force f in this way, it becomes possible to examine the state of deformation of the wire harness that accurately reflects the movement of the worker expected at the time of assembly. In addition, it is possible to examine the deformation state of the wire harness when the predetermined part is arbitrarily pulled or bent. In step S4, various control values related to the calculation process are also set. This step S4 corresponds to the setting means and the second setting means in the following (c1) to (c9). Further, the outer shape parameter and the non-outer shape parameter correspond to the physical characteristics in the following (c1) to (c9).

  After the setting of each value necessary for shape calculation is completed, if there is a predetermined trigger for starting calculation, the initial shape 1a is erased from the display device 23 in step S5, and then the process proceeds to step S7 and subsequent steps. . In step S7 and subsequent steps, the state of deformation until the initial shape of the wire harness is displaced to the final shape that is balanced to satisfy the set constraint conditions and the like is sequentially updated and output on the display device 23. This state corresponds to, for example, a plurality of time points t1, t2,..., Ti assigned between the initial shape and the final shape. For example, the time from the initial shape to the final shape is set to 10 seconds, for example, and the state of deformation every second is output. This process will be described below.

  First, after setting the time point ti to the time point t1 in step S6, the process proceeds to step S7 and subsequent steps. In the processing loop of step S7 to step S11, the shape of the wire harness at the time points t1, t2,..., Ti is calculated sequentially using the finite element method, and the state of deformation of the wire harness until the time point td is reached. Are updated and output.

  That is, in step S7, the predicted shape at the time point ti is calculated by applying each value necessary for shape calculation set in step S4 to the finite element method, particularly, the above equation (3). Next, in step S8, the predicted shape (intermediate shape) at the time point ti calculated in step S7 is output on the display device 23. In step S9, after counting up the time point ti, it is determined in step S11 whether the time point ti has reached the final time point td. The step S7 corresponds to the calculation means in the following (c1) to (c9).

  Further, if it is determined in step S10 that the time point ti has not yet reached the final time point td (N in step S10), the predicted shape at the time point ti is deleted in step S11, and then the process returns to step S7. The predicted shape at the next time point ti is calculated in the same manner as described above. That is, until the time point ti reaches the final time point td, the calculation and output process of the intermediate shape is repeated in steps S7 and S8. By such processing, the state of deformation of the wire harness as shown in FIG. 15C is sequentially output. That is, the state of deformation from the initial shape 1a through the intermediate shapes 1b and 1c to the final shape 1d described later is output. In the figure, the positions of the nodes 1z1, 1z2, 1z3, 1z4, 1z5, 1z6, 1z7, and 1z8 of the final shape 1d are the nodes 1a1, 1a2, 1a3, 1a4, 1a5, 1a6, 1a7 in the initial shape 1a, respectively. , And 1a8. Further, the nodes 1b8 and 1c8 of the intermediate shapes 1b and 1c correspond to the node 1a8 in the initial shape 1a.

  According to the above processing, the intermediate shape at each time point is automatically and successively updated and output, but the update output of step S11 is temporarily stopped between step S10 and step S11. May be inserted (corresponding to the temporary stop control means in (c1) to (c9) below). In other words, the current shape may be stationary on the display device 23 and output until a predetermined trigger is generated by the input device 22. By doing so, the user of the present apparatus can stop the state of the wire harness being deformed at an arbitrary point in time, and can examine the positional relationship between the wire harness and the interference, the degree of distortion, and the like.

  On the other hand, if it is determined in step S10 that the time point ti has reached the final time point td (Y in step S10), the process proceeds to step S12, where the predicted shape at the final time point td as shown in FIG. After the final shape 1z is output on the display device 23, the series of processes is terminated. This final shape 1z is a stable state that is dynamically balanced so as to satisfy the set constraint conditions and the like. The final shape 1z may be output to the printing device 24 as well. Steps S8 and S12 correspond to the output means in the following (c1) to (c9).

  Thus, according to the third embodiment, it is possible to know in advance the state of deformation until the wire harness is displaced to the final shape before performing the assembly work. As a result, the optimal wiring design of the wire harness can be easily and accurately performed in a short period of time without depending on the skill level of the designer. In particular, it is possible to apply the finite element method by assuming that the wire harness is an elastic body in which a plurality of beam elements having a circular cross-section and maintaining linearity are combined, thereby realizing more accurate shape prediction. .

  The technical ideas (c1) to (c8) that can be grasped from the third embodiment will be described below together with the effects thereof.

  In the wiring design support method for a linear structure in (c1), the target linear structure is regarded as an elastic body in which a plurality of beam elements that maintain linearity are combined, and a finite element method is used. A method for supporting optimal wiring design of the linear structure by predicting and outputting the shape of the linear structure satisfying a predetermined condition, wherein the physical property of the linear structure as the predetermined condition Applying characteristics and constraint conditions to the finite element method, and sequentially calculating how the linear structure is deformed from an arbitrary initial shape to a final shape that satisfies the predetermined condition The result is sequentially output.

  In addition, the wiring design support method for the line structure of (c2) is displaced by applying a predetermined force to a predetermined portion of the line structure in the wiring design support method of the line structure of (c1). The state of deformation of the linear structure at the time is sequentially calculated, and the results are sequentially output.

  Further, the wiring design support method for a linear structure in (c3) is the wiring design support method for a linear structure in (c1) or (c2), in which the linear structure is a wire harness wired to a vehicle. The constraint condition is the coordinates of the vertices of the plurality of beam elements and the degrees of freedom at the vertices, and the physical characteristics are a cross-sectional area, a length, a cross-sectional secondary moment, a cross-section of the linear structure. It is a value based on secondary pole moment, density, Poisson's ratio, longitudinal elastic modulus and transverse elastic modulus.

  In addition, the wiring design support method for a linear structure in (c4) is a target in the method for supporting the optimal wiring design of the linear structure by calculating a predicted shape related to the wiring of the linear structure. It is characterized by sequentially calculating how the linear structure is deformed from an arbitrary initial shape to a balanced final shape and sequentially outputting the result.

  Further, the wiring design support device for a linear structure of (c5) regards the target linear structure as an elastic body in which a plurality of beam elements having linearity are combined, and uses a finite element method. Predicting and outputting the shape of the linear structure satisfying a predetermined condition, thereby supporting an optimal wiring design of the linear structure, wherein the linear structure as the predetermined condition A setting means for setting the physical characteristics and constraint conditions, and a final shape in which the predetermined condition is applied to the finite element method and the linear structure is balanced so as to satisfy the predetermined condition from an arbitrary initial shape. A calculating means for sequentially calculating the deformation state, and an output means for sequentially updating and outputting the deformation state of the linear structure based on the calculation result by the calculating means. .

  In addition, the wiring design support device for a linear structure in (c6) sets a force applied to a predetermined part of the linear structure as the predetermined condition in the wiring design support device for a linear structure in (c5). And a second setting unit that sequentially calculates the deformation state of the linear structure when the force is applied and displaced.

  Further, the wiring structure support device for a linear structure of (c7) is a device that temporarily outputs the output by the output means by a trigger based on a manual operation in the wiring design support device of the linear structure of (c5) or (c6). It further includes a temporary stop control means for stationary.

  Further, the wiring design support program for a linear structure in (c8) regards the target linear structure as an elastic body in which a plurality of beam elements having linearity are connected, and uses a finite element method. In order to support the optimal wiring design of the line structure by predicting and outputting the shape of the line structure satisfying a predetermined condition, the computer uses the line structure as the predetermined condition. Setting means for setting physical properties and constraint conditions of an object, applying the predetermined condition to the finite element method, and a final shape in which the linear structure is balanced from an arbitrary initial shape to satisfy the predetermined condition A calculation means for sequentially calculating the deformation state, and an output means for sequentially updating and outputting the deformation state of the linear structure based on a calculation result by the calculation means. .

  According to (c1), the target linear structure is regarded as an elastic body in which a plurality of beam elements that maintain linearity are combined. Then, using the finite element method, the predicted shape of the line structure satisfying the predetermined condition is output. In particular, the finite element method is used to sequentially calculate how the linear structure deforms from the initial shape to the balanced final shape while satisfying the physical characteristics and constraint conditions of the linear structure. The results are output sequentially.

  Further, according to (c2), the deformation state of the linear structure when it is displaced by applying a force to a predetermined part of the linear structure is sequentially calculated, and the result is sequentially output.

  Further, according to (c3), the constraint condition is the coordinates of each vertex of a plurality of beam elements constituting the linear structure and the degree of freedom at each vertex, and the physical characteristics are the cross-sectional area, length, The values are based on the cross-section secondary moment, cross-section secondary pole moment, density, Poisson's ratio, longitudinal elastic modulus, and transverse elastic modulus.

  Further, according to (c4), the state in which the target linear structure is deformed from the initial shape to the final shape balanced is sequentially calculated and the results are sequentially output.

  In addition, according to (c5), the target linear structure is regarded as an elastic body in which a plurality of beam elements that maintain linearity are combined. Then, using the finite element method, the predicted shape of the line structure satisfying the predetermined condition is output. In particular, the finite element method is used to show the deformation of the linear structure when the linear structure is displaced from the initial shape to the balanced final shape while satisfying the physical characteristics and constraint conditions of the linear structure. It is used to calculate sequentially and output the results sequentially.

  Further, according to (c6), the deformation state of the linear structure when it is displaced by applying a force to a predetermined part of the linear structure is sequentially calculated, and the result is sequentially output.

  According to (c7), the output by the output means is temporarily stopped by a trigger based on a manual operation.

  According to (c8), using the finite element method, the computer is caused to output the predicted shape of the line structure satisfying the predetermined condition. In particular, the finite element method is used to show the deformation of the linear structure when the linear structure is displaced from the initial shape to the balanced final shape while satisfying the physical characteristics and constraint conditions of the linear structure. It is made to calculate sequentially using and to output the result sequentially.

[effect]
According to (c1), (c5), and (c8), the target line structure is regarded as an elastic body in which a plurality of beam elements that maintain linearity are combined, and using a finite element method, The predicted shape of the line structure satisfying the predetermined condition is output. In particular, while satisfying the physical properties and constraint conditions of the linear structure, the state in which the linear structure is deformed from the initial shape to the balanced final shape is sequentially calculated using the finite element method. The results are output sequentially. Therefore, the state of deformation of the linear structure until the linear structure is displaced to the final shape can be known in advance before the assembly operation. As a result, optimal wiring design or routing design of the line structure can be easily and accurately performed in a short period of time without depending on the skill level of the designer.

  Further, according to (c2) and (c6), the deformation state of the linear structure when the predetermined portion of the linear structure is displaced by applying a force is sequentially calculated, and the result is sequentially output. Therefore, it becomes possible to examine the state of deformation of the linear structure that accurately reflects the movement of the worker expected at the time of assembly. Moreover, it becomes possible to examine the deformation state of the linear structure when the predetermined part is arbitrarily pulled or bent.

  Further, according to (c3), the constraint condition is the coordinates of each vertex of a plurality of beam elements constituting the linear structure and the degree of freedom at each vertex, and the physical characteristics are the cross-sectional area, length, The values are based on the cross-section secondary moment, the cross-section secondary pole moment, the density, the Poisson's ratio, the longitudinal elastic modulus, and the transverse elastic modulus, all of which can be obtained in advance from a wire harness wired to the vehicle. Therefore, wiring simulation of the wire harness that assumes actual assembly work can be performed.

  Further, according to (c4), the state in which the target linear structure is deformed from the initial shape to the final shape balanced is sequentially calculated and the results are sequentially output. Therefore, the state of deformation of the linear structure until the linear structure is displaced to the final shape can be known in advance before the assembly operation. As a result, a more optimal wiring design of the line structure can be easily and accurately performed.

  According to (c7), the output by the output means is temporarily stopped by a trigger based on a manual operation. Therefore, the user of this apparatus can stop the output of the linear structure in the middle of deformation at an arbitrary point in time, and examine the positional relationship between the linear structure and the interfering object, the degree of distortion, and the like.

[Embodiment 4]
A processing procedure according to the fourth embodiment will be described with reference to FIGS. 16 and 17. FIG. 16 is a flowchart showing a processing procedure according to the present embodiment performed using the hardware configuration shown in FIG. FIG. 17A to FIG. 17D are diagrams illustrating output results in the course of each process shown in FIG.

  First, based on the initial value set in step S1 shown in FIG. 16, the initial shape is calculated in step S2, and in step S3, the calculated initial shape 31 is output as shown in FIG. The As an initial value for obtaining the initial shape 31, for example, the positions at which the connectors at both ends of the target wire harness are attached are used. The restraint direction of the connector and the clip attached to the intermediate portion of the wire harness. Coordinates and restraint directions, or a minimum bending radius depending on the material characteristics of the wire harness, a bending radius that can be bent by a normal force by an operator when the wire harness is assembled, or the like may be used. In any case, it is preferable to output the initial shape reflecting the shape before the assembly of the target wire harness. The shape calculation process is performed by the microcomputer 21, and the input device 22 is used to set the initial value, and the display device 23 is used to output the initial shape. Also in the subsequent processing, the shape calculation processing is performed by the microcomputer 21, the input device 22 is used for setting each value, and the display device 23 is used for outputting the calculation result.

  Next, in step S4, nodes 33a to 33z as shown in FIG. 17B are assigned to the output initial shape 31, and predetermined constraint conditions are set at the nodes 33a to 33z. Is done. As the constraint condition, a constraint type (complete constraint, rotation constraint, complete freedom, etc.) as shown in FIG. 2 for each of the nodes 33a to 33z, local coordinates, and the like are set. These constraint conditions correspond to the displacement destination. As each of the nodes 33a to 33z, a part to which a support member such as a connector or a clip is attached is assigned. In addition, as shown in FIG. 2, support member names such as connectors and clips may be used for setting the constraint type. Each value set here relates to each element in the displacement vector {x} in the above equation (3).

  At the same time, in step S4, the external parameters and non-external parameters of the predicted wire harness are also set. The length l and the cross-sectional area A are set as the external parameters, and the non-external parameters are the secondary moment I of the cross section, the secondary pole moment J, the Poisson's ratio μ, the density ρ, the longitudinal elastic modulus E, and the transverse elastic modulus. G is set. For these, values measured or calculated in advance as described above are used. The value set here relates to each element in the stiffness matrix [K] in the above equation (3). The outer shape parameter and the non-outer shape parameter correspond to the physical characteristics in the following (d1) to (d10).

  Next, in step S5, the magnitude and direction of the force f applied to the predetermined part of the wire harness are set. The magnitude and direction of the force f to be applied may be a value for displacing the wire harness to an intermediate point from the initial shape to the final shape, or a value for displacing the wire harness to the final shape at once. Also good. As shown in FIG. 17B, the part to which the force f is applied may be, for example, only the node 33z, all of the nodes 33b to 33z other than the node 33a, or any one of them. Also good. The force f to be applied may be equal to all portions where the force is applied, or may have a difference as appropriate. Further, the force f to be applied is more realistic if the gravity G of the wire harness itself is included.

  Further, the force f to be applied may be based on, for example, an operator's movement expected at the time of assembly. The value set here relates to each element in the force vector [f] in the above equation (3). By setting the force f in this way, it becomes possible to examine the state of deformation of the wire harness that accurately reflects the movement of the worker expected at the time of assembly. In addition, it is possible to examine the deformation state of the wire harness when the predetermined part is arbitrarily pulled or bent.

  When the setting of each value is completed, the process proceeds to step S6, and the currently displayed path shape is deleted. Next, the finite element method is applied, a new predicted shape is calculated in step S7, strain and stress are calculated in step S8, and reaction force and moment generated at the constraint point are calculated in step S9.

  That is, in steps S7 to S9, the values set in steps S4 and S5 are applied to the equation (3), and the unknowns in the equation (3) are calculated. Specifically, when the unknown number of the displacement vector {x} in Equation (3) is calculated, a new predicted shape of the wire harness is obtained. Furthermore, when the unknown in the force vector {F} in the equation (3) is calculated, strain, stress, reaction force, and moment for the wire harness can be calculated. As is well known, since stress is expressed as (external force / cross-sectional area) and strain is expressed as (elongation / length), these relational expressions are also used when calculating stress and strain. Steps S7 and S8 correspond to strain stress calculation means in the following (d1) to (d10), and steps S7 and S9 correspond to reaction force moment calculation means in the following (d1) to (d10).

  Next, in step S10, as shown in FIG. 17C, the calculated new predicted shape is displayed. Note that the nodes 35a, 35b, 35c, 35d, 35e, 35f, 35g, and 35z of the new predicted shape 36 shown in FIG. 17C are the nodes 33a and 33b in the initial shape 31 shown in FIG. , 33c, 33d, 33e, 33f, 33g and 33z. The position of the node 33a coincides with the position of the node 35a, and the other nodes are displaced by the applied force f and gravity G.

  Next, in step S <b> 11, the calculated strain and stress are displayed on the display device 23 together with the new predicted shape 36. The display form may be a numerical value, but preferably, the distortion and stress are displayed in multiple colors according to those values. For example, as shown in FIG. 17D, the part 36b of the wire harness having a large strain or stress value is displayed in red, and the part 36a having a small value is displayed in green. As described above, the multicolor display makes it possible to easily and intuitively recognize the strain and stress on the wire harness. In addition, said step S10 and step S11 respond | correspond to the distortion stress output means in following (d1)-(d10).

  In step S12, the calculated reaction force and moment are displayed on the display device 23 together with the new predicted shape 36. The display form may be numerical values, but preferably the reaction force and moment are displayed by arrows 37a, 37b and 38a, 38b, respectively. Thus, by displaying the arrow, it is easy to examine the arrangement and durability of the restraining members such as connectors and clips. Steps S10 and S12 correspond to reaction force moment output means in the following (d1) to (d10).

  Next, in step S13, it is determined whether or not there is an end trigger due to a predetermined operation or the like of the input device 22, and if there is an end trigger, the above-described series of processing ends (Y in step S13), but unless there is an end trigger. The process returns to step S5 (N in step S13). When returning to step S5, a value for displacing to the next intermediate point until reaching the final shape or a value for displacing the wire harness to the final shape at once is set, and the same processing procedure as above is performed. , Along with the next new predicted shape, the corresponding strain, stress, reaction force and moment are redisplayed. Such processing can be arbitrarily repeated. By doing this, from the initial shape to the final shape, the wire harness is displaced while applying a predetermined force, and based on the force applied at that time, it is possible to examine whether the work can actually be performed. It becomes possible.

  As described above, according to the fourth embodiment, it is possible to use the finite element method for the route design of the wire harness, and the strain, stress, and restraint point generated when the wire harness is displaced while applying a force are generated. Make reaction forces and moments accurately predictable. Therefore, according to the present embodiment, it is possible to easily design a route design and work procedure that do not impose an excessive load, and to examine the optimal arrangement and durability of the restraint member without depending on the skill level of the designer. And it can be done accurately.

  The technical ideas (d1) to (d10) that can be grasped from the fourth embodiment will be described below together with the effects thereof.

  In the wiring design support method for a linear structure in (d1), the target linear structure is regarded as an elastic body in which a plurality of beam elements that maintain linearity are combined, and using a finite element method, Optimum wiring of the linear structure by predicting and outputting a phenomenon that occurs when the initial shape of the linear structure is displaced to satisfy a predetermined condition while applying a predetermined force A method for supporting design, wherein physical properties and constraint conditions of the linear structure as the predetermined condition, and information on the magnitude and direction of the force are applied to the finite element method, and the linear element is applied. The predicted shape of the structure and the strain and stress generated in the linear structure are calculated, and the calculation results are output.

  Further, the wiring design support method for a line structure of (d2) is the method for supporting the wiring design of a line structure of (d1), wherein the strain and stress are displayed in multiple colors according to their values. Features.

  In addition, the wiring design support method for a linear structure in (d3) is generated at the restraint point of the linear structure in place of the strain and stress in the wiring design support method for the linear structure in (d1). The reaction force and moment are calculated, and the calculation result is output together with the predicted shape.

  Further, the wiring design support method for a linear structure in (d4) is characterized in that the reaction force and moment are displayed by arrows in the wiring design support method for a linear structure in (d3).

  Further, the wiring design support method for a linear structure in (d5) is the same as the wiring design support method for a linear structure in (d1), in which the strain and stress are generated at the restraint point of the linear structure. Forces and moments are also calculated, and the calculation results are output together with the predicted shape.

  Moreover, the wiring design support method for a linear structure in (d6) is the wiring design support method for a linear structure in any one of (d1) to (d5), in which the linear structure is applied to a vehicle. It is a wire harness to be wired, and the constraint condition is a coordinate of each vertex of the plurality of beam elements and a degree of freedom at each vertex, and the physical characteristics are a cross-sectional area, a length, a cross-section of the linear structure It is a value based on secondary moment, cross-sectional secondary pole moment, density, Poisson's ratio, longitudinal elastic modulus and transverse elastic modulus.

  Also, the wiring design support device for a linear structure in (d7) regards the target linear structure as an elastic body in which a plurality of beam elements having linearity are connected, and uses a finite element method. By predicting and outputting a phenomenon that occurs when the predetermined shape is displaced so as to satisfy a predetermined condition while applying a predetermined force to the initial shape of the linear structure, An apparatus for supporting a simple wiring design, applying physical property and constraint conditions of the linear structure as the predetermined condition, and information on the magnitude and direction of the force to the finite element method, Predicted shape of the line structure, strain stress calculating means for calculating strain and stress generated in the line structure, the predicted shape calculated by the strain stress calculating means, and the strain and stress Strain stress output means for outputting And wherein the Mukoto.

  In addition, the wiring structure support device for a linear structure in (d8) regards the target linear structure as an elastic body in which a plurality of beam elements that maintain linearity are combined, and uses a finite element method. By predicting and outputting a phenomenon that occurs when the predetermined shape is displaced so as to satisfy a predetermined condition while applying a predetermined force to the initial shape of the linear structure, An apparatus for supporting a simple wiring design, applying physical property and constraint conditions of the linear structure as the predetermined condition, and information on the magnitude and direction of the force to the finite element method, A predicted shape of the linear structure, and a reaction force moment calculating means for calculating a reaction force and a moment generated at a constraint point of the linear structure, and the predicted shape calculated by the reaction force moment calculating means, And the reaction force and moment Characterized in that it comprises a reaction force moment output means for outputting.

  In addition, the wiring structure support program for a linear structure in (d9) regards the target linear structure as an elastic body in which a plurality of beam elements having linearity are connected, and uses a finite element method. By predicting and outputting a phenomenon that occurs when the predetermined shape is displaced so as to satisfy a predetermined condition while applying a predetermined force to the initial shape of the linear structure, In order to support simple wiring design, a computer is applied to the finite element method with information on physical characteristics and constraint conditions of the linear structure as the predetermined condition, and the magnitude and direction of the force, Predicted shape of the linear structure, strain stress calculating means for calculating strain and stress generated in the linear structure, predicted shape calculated by the strain stress calculating means, and the strain and stress Output strain stress Force means, to function as, and wherein the.

  Further, the wiring design support program for a line structure in (d10) regards the target line structure as an elastic body in which a plurality of beam elements having linearity are connected, and uses a finite element method. By predicting and outputting a phenomenon that occurs when the predetermined shape is displaced so as to satisfy a predetermined condition while applying a predetermined force to the initial shape of the linear structure, In order to support simple wiring design, a computer is applied to the finite element method with information on physical characteristics and constraint conditions of the linear structure as the predetermined condition, and the magnitude and direction of the force, The predicted shape of the linear structure, and the reaction force moment calculating means for calculating the reaction force and moment generated at the restraint point of the linear structure, the predicted shape calculated by the reaction force moment calculating means, And the anti And reaction force moment output means for outputting moment, to function as, and wherein the.

  According to (d1), (d7), and (d9), the finite element method is given information on the physical characteristics and restraint conditions of the line structure, and the magnitude and direction of the applied force. The predicted shape and strain and stress generated in the linear structure are calculated, and these calculation results are output.

  In addition, according to (d2), distortion and stress are displayed in multiple colors according to their values.

  Further, according to (d3), (d8) and (d10), the finite element method is given information on the physical characteristics and restraint conditions of the linear structure, and the magnitude and direction of the force. The predicted shape and the reaction force and moment generated in the linear structure are calculated, and the calculation results are output.

  Further, according to (d4), the reaction force and moment are displayed by arrows.

  Further, according to (d5), using the finite element method, the reaction force and the moment generated at the restraint point of the linear structure are calculated together with the strain and stress, and the calculation results are output together with the predicted shape. .

  Further, according to (d6), the constraint condition is the coordinates of a plurality of nodes and the degree of freedom of constraint at each node, and the physical characteristics are the cross-sectional area, length, cross-sectional secondary moment, cross-sectional secondary pole moment, density, The values are based on Poisson's ratio, longitudinal elastic modulus and transverse elastic modulus.

[effect]
According to (d1), (d7), and (d9), the finite element method is given information on the physical characteristics and restraint conditions of the line structure, and the magnitude and direction of the applied force. The predicted shape and strain and stress generated in the linear structure are calculated, and these calculation results are output. As described above, by using the finite element method, it is possible to accurately predict the strain and stress generated when the linear structure is displaced while applying a force.

  Moreover, according to (d2), since distortion and stress are displayed in multiple colors according to these values, the distortion and stress on the linear structure can be easily and intuitively recognized.

  Further, according to (d3), (d8) and (d10), the finite element method is given information on the physical characteristics and restraint conditions of the linear structure, and the magnitude and direction of the force. The predicted shape and the reaction force and moment generated in the linear structure are calculated, and the calculation results are output. Thus, by using the finite element method, it is possible to accurately predict the reaction force and moment generated at the restraint point of the linear structure generated when the linear structure is displaced while applying a force.

  Further, according to (d4), since the reaction force and moment are displayed by arrows, the reaction force and moment generated at the restraint point on the linear structure can be recognized easily and intuitively.

  Further, according to (d5), using the finite element method, the reaction force and the moment generated at the restraint point of the linear structure are calculated together with the strain and stress, and the calculation results are output together with the predicted shape. Therefore, it is possible to accurately grasp the influence on the linear structure when the linear structure is displaced while applying a force.

  Further, according to (d6), the constraint condition is the coordinates of a plurality of nodes and the degree of freedom of constraint at each node, and the physical characteristics are the cross-sectional area, length, cross-sectional secondary moment, cross-sectional secondary pole moment, density, The values are based on the Poisson's ratio, the longitudinal elastic modulus, and the transverse elastic modulus, and all of these values can be obtained in advance from the wire harness wired to the vehicle. Therefore, a realistic and accurate route that assumes actual assembly work. Can be considered.

[Embodiment 5]
When a wire structure such as a wire harness is wired to a vehicle, vibrations caused by the engine or running are frequently generated, so it is necessary to design the wire harness so as not to cause these vibrations and resonance phenomena. preferable. Therefore, in the fifth embodiment, in particular, the eigenvalues relating to the vibration with respect to the predicted shape of the linear structure such as the wire harness are also output so that more accurate wiring design of the linear structure can be easily and accurately performed. Make it possible.

  In the fifth embodiment, eigenvalue analysis related to vibration with respect to the predicted shape of the wire harness, that is, calculation of the natural frequency and the natural vibration mode is also performed. Therefore, the theory and basic formulas used at that time will be briefly described. Keep it.

That is, the equation of motion for the above equation (4) is expressed by the following equation (12) when Newton's second law is applied.
[M] {x ″} − [K] {x} = 0 (12)
Here, [M]: inertia matrix, {x ″}: second-order time differentiation of displacement vector {x} is shown.

Now
{X} = [X] e ^j ω ^t (13)
Then,
{X ′} = jω [X] e ^j ω ^t (14)
{X ″} = − ω ² [X] e ^j ω ^t (15)
It becomes.
Here, {x ′} represents the first-order time differentiation of the displacement vector {x}.

Substituting Equation (13), Equation (14) and Equation (15) into Equation (12) above,
[M] (ω ² ) (− ω ² [X] e ^j ω ^t ) − [K] ([X] e ^j ω ^t ) = 0
When this is further modified, the following formula (16) is finally obtained.
(−ω ² [M] − [K]) [X] e ^j ω ^t = 0
(−ω ² [M] − [K]) [X] e ^j ω ^t = 0
(−ω ² [M] − [K]) [X] = 0
(−ω ² [I] − [M] ⁻¹ [K]) [X] = 0 (16)
Here, [I]: unit matrix ω: natural frequency [X]: natural vibration mode are shown.

  The general eigenvalue analysis as described above is also shown in Non-Patent Document 2, for example.

  Therefore, it is possible to calculate the natural frequency and the natural vibration mode with respect to the predicted shape of the wire harness using the theory and basic equation as described above.

  A processing procedure according to the fifth embodiment will be described with reference to FIGS. 18 and 19. FIG. 18 is a flowchart showing a processing procedure according to the present embodiment, which is performed using the hardware configuration shown in FIG. FIGS. 19A to 19C are diagrams illustrating output results in the processes shown in FIG.

  First, in step S1 shown in FIG. 18, a constraint condition is set at a portion to which a connector or clip of the target wire harness is attached as shown by nodes 1a1, 1a2, and 1a3 in FIG. As the constraint condition, a constraint type (complete constraint, rotational constraint, complete freedom, etc.) as shown in FIG. 2 for each node 1a1, 1a2, and 1a3, local coordinates, and the like are set. These constraint conditions correspond to the displacement destination. As each node 1a1, 1a2, and 1a3, a part to which a support member such as a connector or a clip is attached is assigned. In addition, as shown in FIG. 2, the name of a support member such as a connector or a fixing clip may be used for setting the constraint type. Each value set here relates to each element in the displacement vector {x} in the above equation (3).

  At the same time, in step S1, the external parameter and the non-external parameter of the predicted wire harness are also set. The length l and the cross-sectional area A are set as the external parameters, and the non-external parameters are the secondary moment I of the cross section, the secondary pole moment J, the Poisson's ratio μ, the density ρ, the longitudinal elastic modulus E, and the transverse elastic modulus. G is set. For these, values measured or calculated in advance as described above are used. The value set here relates to each element in the stiffness matrix [K] in the above equation (3). The input device 22 is used for setting each value. Also in the subsequent processing, the input device 22 is used for setting each value, the shape calculation processing is performed by the microcomputer 21, and the display device 23 is used for outputting the calculation result.

  Further, in step S1, a force f applied to a predetermined part of the wire harness, for example, the node 1a3 corresponding to the position where the connector is attached may be set. This force f is based on, for example, the movement of the worker expected at the time of assembly. The value set here relates to each element in the force vector [f] in the above equation (3). Note that an initial shape may be calculated in advance before step S1. The initial values for obtaining the initial shape include, for example, the position where the connectors at both ends of the target wire harness are attached and the restraining direction, the minimum bending radius depending on the material characteristics of this wire harness, and work when assembling the wire harness. A bending radius that can be bent by a normal force can be used. In step S1, various control values related to the calculation process are also set. This step S1 corresponds to the setting means in the following (e1) to (e7). Further, the outer shape parameter and the non-outer shape parameter correspond to the physical characteristics in the following (e1) to (e7).

  After the setting of each value necessary for shape calculation is completed, if there is a predetermined trigger for starting the calculation, the above-described constraint conditions and the like are satisfied using the finite element method in step S2 and subsequent steps. A balanced predicted shape is calculated, the eigenvalue analysis is performed, and these results are output. Then, it is possible to repeatedly output a predicted shape by changing the setting of each value until a predetermined end trigger is present. This process will be described below.

  In other words, in step S2, each value necessary for the shape calculation set in step S1 is applied to the finite element method, in particular, the above equation (3), and the mechanical as shown in FIG. The predicted shape 1a in a balanced state is calculated. The predicted shape 1a as shown in FIG. 19B may be output together with the calculation result of the natural frequency and the natural vibration mode as described later, or only the predicted shape 1a can be output alone. Also good. This step S2 corresponds to the predicted shape calculation means in the following (e1) to (e7).

  Next, in step S3, the natural frequency and natural vibration mode for the predicted shape 1a calculated in step S2 are calculated. For this calculation process, the above equation (16) or the like is used. In step S4, as shown in FIG. 19C, the predicted shape 1a, natural frequency, and natural vibration mode calculated in steps S2 and S3 are output on the display device 23. As an output result of the natural frequency and the natural vibration mode, as shown by a dotted line 1b and a broken line 1c in FIG. 19C, the waveform of the wire harness predicted from the calculated natural frequency and the natural vibration mode, in particular, It is preferable to include information such as the maximum amplitude value. From such an output result, it is possible to intuitively grasp whether or not a wire harness wired to satisfy a predetermined constraint condition interferes with various obstacles due to vibration. For this purpose, various obstacles and the like may be output on the display device 23 together with output results of the predicted shape 1a, the natural frequency, and the natural vibration mode. Further, the natural frequency and the natural vibration mode may be output as numerical values. By doing so, the comparison with the vibration frequency from the vibration source caused by the vehicle engine or the like is facilitated, and the resonance phenomenon can be effectively prevented. Step S3 corresponds to the natural frequency calculation means and natural vibration mode calculation means in the following (e1) to (e7). Further, the output processing of the natural frequency and the natural vibration mode in step S4 corresponds to the first output means and the second output means in the following (e1) to (e7), respectively.

  Next, in step S5, the presence / absence of a predetermined end trigger is determined, and unless there is an end trigger, the process proceeds to step S6 (N in step S5), and if there is an end trigger, the series of processing ends (Y in step S5). ). Note that the end trigger is, for example, a keyboard operation of the input device 22.

  In step S6, the values set in step S1 are changed and reset in consideration of interference with various obstacles due to vibration, resonance phenomenon, and the like. That is, the constraint condition, the outer shape parameter, and the non-outer shape parameter are changed so as not to resonate under the influence of the vibration source. Next, in step S7, the current predicted shape 1a on the display device 23 is deleted, and the process returns to step S2. Then, until it is determined in step S5 that there is an end trigger, calculation processing of the predicted shape, natural frequency, and natural vibration mode using the finite element method is performed based on each value changed in steps S2 to S4. , And the output processing of the result is performed.

  In step S5, if there is an end trigger, only the final predicted wire harness shape 1a as shown in FIG. 19B may be output.

  As described above, according to the fifth embodiment, it is possible to know in advance the influence of the predicted shape and vibration of the wire harness before performing the assembly work. In particular, since vibrations caused by the engine, vibrations caused by running, and the like frequently occur in the vehicle, this embodiment is very effective in designing a wire harness that does not cause resonance with these vibrations. As a result, the optimal wiring design of the wire harness can be easily and accurately performed in a short period of time without depending on the skill level of the designer. Of course, it is possible to apply the finite element method by assuming that the wire harness is an elastic body in which a plurality of beam elements having a circular cross-section and maintaining linearity are combined, thereby realizing more accurate shape prediction. Needless to say.

  In addition, the method and apparatus of this invention are not limited to the wire harness wired in a vehicle, It can apply similarly to the wire harness wired to the various apparatuses etc. which generate | occur | produce a vibration. Further, in order to prevent the resonance phenomenon, the vibration may be suppressed by applying a large attenuation other than that described in the above embodiment.

  The technical ideas (e1) to (e7) that can be grasped from the fifth embodiment will be described below together with the effects thereof.

  In the wiring design support method for a linear structure of (e1), the target linear structure is regarded as an elastic body in which a plurality of beam elements that maintain linearity are combined, and using a finite element method, A method of supporting optimal wiring design of the linear structure by outputting a predicted shape of the linear structure satisfying a predetermined condition, wherein the predetermined condition includes a line structure Applying physical characteristics and constraint conditions to the finite element method to calculate a predicted shape that is balanced, and also calculating eigenvalues related to vibrations for the calculated predicted shape, and calculating these results Is output.

  Further, the wiring design support method for a linear structure in (e2) is the wiring design support method for a linear structure in (e1), wherein the eigenvalue relating to the vibration includes at least one of a natural frequency and a natural vibration mode. Is included.

  The wiring design support method for a linear structure in (e3) is the wiring design support method for a linear structure in (e1) or (e2), in which the linear structure is a wire that is wired to a vehicle. It is a harness, and the constraint condition is the coordinates of each vertex of the plurality of beam elements and the degree of freedom at each vertex, and the physical characteristics are a cross-sectional area, a length, a cross-sectional secondary moment of the linear structure, It is a value based on the cross-sectional secondary pole moment, density, Poisson's ratio, longitudinal elastic modulus, and transverse elastic modulus.

  Further, the wiring design support method for a linear structure in (e4) is a method for supporting an optimal wiring design of a linear structure by calculating a predicted shape related to the wiring of the linear structure. An eigenvalue analysis related to vibration is performed, and the analysis result is output.

  Further, the wiring design support device for a linear structure in (e5) regards the target linear structure as an elastic body in which a plurality of beam elements having linearity are connected, and uses a finite element method. Output a predicted shape of the linear structure satisfying a predetermined condition, thereby supporting an optimal wiring design of the linear structure, wherein the physical property of the linear structure as the predetermined condition Setting means for setting characteristics and constraint conditions, and prediction shape calculation for calculating a predicted shape in a balanced state by applying the physical characteristics and constraint conditions set by the setting means to the finite element method Means, natural frequency calculation means for calculating the natural frequency for the predicted shape calculated by the predicted shape calculation means, and first output means for outputting the predicted shape and the natural frequency. Features.

  Further, the wiring structure support device for a line structure of (e6) is calculated by the predicted shape calculation device in place of the natural frequency calculation device in the wiring design support device of the wire structure of (e5). A natural vibration mode calculating means for calculating a natural vibration mode for the predicted shape, and a second output means for outputting the predicted shape and the natural vibration mode instead of the first output means. To do.

  Further, the wiring design support program for a linear structure in (e7) regards the target linear structure as an elastic body in which a plurality of beam elements having linearity are connected, and uses a finite element method. In order to support optimal wiring design of the line structure by outputting a predicted shape of the line structure satisfying a predetermined condition, a computer is used as the predetermined condition for the line structure. Setting means for setting physical characteristics and constraint conditions, predictive shape calculation for calculating a predicted shape in a balanced state by applying the physical characteristics and constraint conditions set by the setting means to the finite element method Means, a natural frequency calculation means for calculating a natural frequency for the predicted shape calculated by the predicted shape calculation means, and an output means for outputting the predicted shape and the natural frequency. That.

  According to (e1), (e2), (e5), (e6), and (e7), the target linear structure is regarded as an elastic body in which a plurality of beam elements that maintain linearity are combined. Then, by applying the physical characteristics and constraint conditions of the linear structure to be predicted to the finite element method, a predicted shape that is in a balanced state is calculated, and the vibration with respect to the calculated predicted shape is also related. Eigenvalues are also calculated, and these calculation results are output.

  Moreover, according to (e3), it is applied to the wire harness wired to the vehicle, and the constraint condition is the coordinates of each vertex of a plurality of beam elements constituting the linear structure and the degrees of freedom at each vertex, and the physical characteristics are The values are based on the cross-sectional area, length, second-order moment, second-order pole moment, density, Poisson's ratio, longitudinal elastic modulus and transverse elastic modulus of the linear structure.

  Further, according to (e4), in the method for supporting the optimum wiring design of the line structure by calculating the predicted shape related to the wiring of the line structure, the eigenvalue analysis regarding the vibration with respect to the predicted shape is performed. And the analysis result is output.

[effect]
According to (e1), (e2), (e5), (e6), and (e7), the target linear structure is regarded as an elastic body in which a plurality of beam elements that maintain linearity are combined. Then, by applying the physical characteristics and constraint conditions of the linear structure to be predicted to the finite element method, a predicted shape that is in a balanced state is calculated, and the vibration with respect to the calculated predicted shape is also related. A natural value, that is, a natural frequency and a natural vibration mode are also calculated, and these calculation results are output. Therefore, it is possible to know in advance the resonance phenomenon or the like when the vibration is generated in the object to which the linear structure is attached before performing the assembling work. As a result, more accurate wiring design of the line structure can be easily and accurately performed without depending on the skill level of the designer.

  Moreover, according to (e3), it is applied to the wire harness wired to the vehicle, and the constraint condition is the coordinates of each vertex of a plurality of beam elements constituting the linear structure and the degrees of freedom at each vertex, and the physical characteristics are Since the values are based on the cross-sectional area, length, secondary moment of section, secondary pole moment of cross-section, density, Poisson's ratio, longitudinal elastic modulus and transverse elastic modulus of the wire structure, Design simulation is possible. In particular, since vibrations caused by the engine, running vibrations, and the like frequently occur in the vehicle, the present invention is very effective in designing a wire harness that does not cause resonance with these vibrations.

  Further, according to (e4), in the method for supporting the optimum wiring design of the line structure by calculating the predicted shape related to the wiring of the line structure, the eigenvalue analysis regarding the vibration with respect to the predicted shape is performed. Since the analysis result is output, the resonance phenomenon when the vibration is generated on the object to which the linear structure is attached can be known in advance before the assembly work. As a result, a more accurate wiring design of the line structure can be performed.

  As described above, according to the embodiment of the present invention, it is possible to easily and accurately perform an optimal wiring design of a linear structure such as a wire harness.

  In addition, in the said embodiment, although the wire harness wired in a vehicle was illustrated and demonstrated as a linear structure, this invention is not only such a wire harness but a structure simpler than a wire harness. Needless to say, the present invention can be similarly applied to hoses and tubes wired outside the vehicle, general electric wires, one electric wire, and the like. That is, the wire structure of the present invention includes these hoses, tubes, general electric wires, one electric wire, and the like. Moreover, this invention is applicable also to the wire harness etc. which have a branch line. Further, the present invention can be similarly applied not only to a circular cross section but also to a linear structure such as a rectangular cross section, an annular cross section, an elliptical cross section, and an H-shaped cross section. That is, the linear structure to which the present invention is applied is not limited to a circular cross section.

It is a figure which shows roughly the whole shape of the wire harness used as object in this invention. It is a figure which shows the relationship between the typical support member attached to a wire harness, and a freedom degree of restraint. FIG. 3 (A) is a diagram showing the appearance of the wire harness, FIG. 3 (B) is a diagram showing a state where the wire harness of FIG. 3 (A) is discretized, and FIG. It is the figure which represented the wire harness of FIG. 3 (A) with the beam element and the node. It is a figure for demonstrating the freedom degree in the wire harness represented with the beam element and the node. FIG. 5A is a diagram illustrating the wire harness with three beam elements, and FIG. 5B is a diagram illustrating a state in which the three beam elements in FIG. 5A are coupled. FIG. 6A is a diagram illustrating a state in which the cross-sectional secondary moment and the longitudinal elastic modulus are measured, and FIG. 6B is a diagram illustrating a state in which the cross-sectional secondary polar moment and the transverse elastic modulus are measured. . It is a figure which shows an example of the characteristic table which concerns on Embodiment 1. FIG. It is a block block diagram which shows an example of the hardware constitutions which concern on all embodiment. 3 is a flowchart illustrating a main processing procedure according to the first embodiment. FIG. 10 is a flowchart showing a non-outline parameter calculation subroutine in the main processing procedure of FIG. FIG. 11A to FIG. 11E are diagrams illustrating states in which the wire harness is deformed in each processing step of FIG. 9. 10 is a flowchart illustrating a processing procedure according to the second embodiment. FIG. 13A to FIG. 13F are diagrams illustrating output results in the course of each process shown in FIG. 10 is a flowchart illustrating a processing procedure according to the third embodiment. FIGS. 15A to 15D are diagrams each illustrating an output result in the process of each process illustrated in FIG. 14. 10 is a flowchart illustrating a processing procedure according to the fourth embodiment. FIG. 17A to FIG. 17D are diagrams illustrating output results in the course of each process shown in FIG. 10 is a flowchart illustrating a processing procedure according to the fifth embodiment. FIGS. 19A to 19C are diagrams illustrating output results in the processes shown in FIG.

Explanation of symbols

1 Wire harness (wire structure)
2a, 2b, 2c, 2d connector 3a, 3b, 3c, 3d clip 4 branch point 21 microcomputer 22 input device 23 display device 24 printing device 25 storage device 26 communication interface 27 read / write device 28 internal bus C1 to C7 beam element N1 N8 nodes

Claims (6)

Using a computer that functions as a drawing unit, an outer shape parameter extracting unit, a constraint condition extracting unit, a non-outer shape parameter calculating unit, and a predicted shape calculating unit, a plurality of beam elements in which linearity is maintained for a target line structure A method for supporting optimal wiring design of the line structure by predicting the shape of the line structure using a finite element method, assuming that the elastic body is a combined elastic body,
A drawing step of drawing a linear structure of an arbitrary shape according to a manual operation by the drawing means ;
By the contour parameter extraction unit, a contour parameter extraction step of extracting a contour parameter, from the drawn linear structure is a physical property determined directly contour of linear structure,
A constraint condition extracting step of extracting the constraint condition of the filament structure from the drawn filament structure by the constraint condition extracting unit ;
The non-outer shape parameter calculation means calculates a non-outer shape parameter that is a physical characteristic of the linear structure other than the outer shape parameter necessary for calculation of shape prediction by the finite element method based on the outer shape parameter. Outline parameter calculation process,
By the predicted shape calculating unit, the constraint condition, the outer shape parameter and by applying the non-profile parameters to the finite element method, include the predicted shape calculating step of calculating a predicted shape is physically balanced condition A wiring design support method for a line structure characterized by the above. The wiring design support method according to claim 1,
Said linear structure, a wire harness comprising a plurality of wire members are bundled at a predetermined exterior member,
The profile parameters, and those containing the type and thickness of the wire harness of the outer member, and,
The type, said have you previously stored the thickness and correlated characteristic table the relationship between the non-profile parameter, wherein the non-profile parameter calculation step, by applying the type and the thickness in the characteristic table, the A wiring design support method for a line structure characterized by calculating a non-outline parameter. In the wiring design support method according to claim 2,
The characteristic table is a relationship between the type and thickness and the longitudinal elastic modulus and transverse elastic modulus as the non-external parameter, the relationship between the type and thickness and the longitudinal elastic modulus and Poisson's ratio as the non-external parameter, Alternatively, a wiring design support method for a line structure characterized by associating the type and the thickness with a relationship between a transverse elastic modulus and a Poisson's ratio as the non-external parameters. In the wiring design support method according to any one of claims 1 to 3,
The computer also functions as a warning output means,
When it is impossible to calculate the predicted shape that is in a physically balanced state from the linear structure created according to the manual operation by the warning output means, a warning that warns that effect A wiring design support method for a linear structure, further comprising an output step. The target line structure is regarded as an elastic body in which a plurality of beam elements that maintain linearity are combined, and the shape of the line structure is predicted by using a finite element method. A device that supports optimal wiring design of structures,
A drawing means for drawing a linear structure of an arbitrary shape according to a manual operation;
External parameter extraction means for extracting external parameters, which are physical characteristics that directly determine the external shape of the linear structure, from the drawn linear structure;
A constraint condition extracting means for extracting the constraint condition of the filament structure from the drawn filament structure;
Non-outer shape parameter calculating means for calculating a non-outer shape parameter that is a physical characteristic of the linear structure other than the outer shape parameter necessary for calculation of shape prediction by the finite element method, based on the outer shape parameter;
A linear shape structure characterized by including a predicted shape calculation means for calculating a predicted shape in a physically balanced state by applying the constraint condition, the outer shape parameter, and the non-outer shape parameter to the finite element method Wiring design support device for objects. The target line structure is regarded as an elastic body in which a plurality of beam elements that maintain linearity are combined, and the shape of the line structure is predicted by using a finite element method. To support the optimal wiring design of the structure, the computer
A drawing means for drawing a linear structure of an arbitrary shape according to a manual operation;
Outline parameter extraction means for extracting an outline parameter, which is a physical characteristic that directly determines the outline of the filament structure, from the drawn filament structure,
Constraint condition extracting means for extracting the constraint condition of the filament structure from the drawn filament structure,
Non-outer shape parameter calculating means for calculating a non-outer shape parameter that is a physical characteristic of the linear structure other than the outer shape parameter necessary for calculation of shape prediction by the finite element method based on the outer shape parameter; and
A linear structure characterized in that the constraint condition, the outer shape parameter, and the non-outer shape parameter are applied to the finite element method to function as a predicted shape calculation unit that calculates a predicted shape in a physically balanced state. Wiring design support program for objects.

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