JP4448368B2 - Wire shape predicted shape calculation method, apparatus and program thereof - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a method for calculating a predicted shape of a wire constituting a wire harness, an apparatus thereof, and a program therefor, and more particularly, a method for calculating a predicted shape of a short wire and a long wire in which an exterior member such as a tape is not attached , The apparatus and the program thereof.

  In vehicles and the like, a plurality of electrical components are mounted, and these are connected by a so-called wire harness in which wires such as a plurality of electric wires and communication wires are bundled by a binding member such as an insulation lock or an exterior member such as a tape. Has been. 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 differs fundamentally in the number and kind of each comprised wire rod, the thickness of each branch line, length, elasticity The density is also various.

  Conventionally, a 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) or CAE (Computer Aided Engineering), or the designer's experience. It was often done by intuition. However, there are a wide variety of wire harnesses, and simply using the above-mentioned general-purpose analysis software or relying on the designer's experience, it is not possible to accurately predict and design the rigidity against bending and torsion at each part. It was very difficult.

  Therefore, the present applicant uses the finite element method in the following Patent Document 1 and the like, so that the physical characteristics of the wire structure such as a wire harness, that is, the material and the rigidity against bending and torsion in each part, etc. A method to support the optimal wiring design by making it possible to calculate the predicted shape of the line structure in consideration of this was proposed.

Here, documents cited in the present specification are shown below.
Japanese Patent Application No. 2003-308509 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

  By the way, as shown in FIG. 3, in the vicinity of the end of the wire harness 1 (corresponding to, for example, the vicinity of the connector 2a in FIG. 1), the exterior member 12 is not attached. The wires 11S, 11L and the like are in a state where they are stripped, and the tip is connected to a terminal member 20 such as an LA terminal (for example, corresponding to the connector 2a in FIG. 1). For example, the tips (precisely, core wires) of the wire rods 11S and 11L are fixed to the connection portions 20S and 20L of the terminal member 20 by caulking or soldering. Further, the vicinity of the non-mounting start portion R from the exterior member 12 of the wire rods 11S and 11L is fixed by a support member such as various clips. The terminal member 20 is finally fixed at a predetermined angle by fixing a fixing hole 20H drilled in the center of the terminal member 20 to a vehicle body or the like.

  In the vicinity of the end portion of the wire harness 1, the terminal member 20 before fixing depends on the length of the wire rods 11S and 11L in which the exterior member is not attached and the distance between the connection portions 20S and 20L. Thus, a predetermined swing angle θt is generated. Here, the swing angle θt is, for example, an angle formed between the line K connecting the connection portions 20S and 20L and the non-mounting start portion R, but the line K and other reference lines not shown here It may be the angle formed by And it is very effective for predicting the shape of the wire rods 11S and 11L in the vicinity of the end portions and predicting the swing angle θt of the terminal member 20 for optimal wiring harness wiring design. .

  Even when it is known in advance that the terminal member 20 is fixed at a predetermined swing angle θt, the shapes of the two wires 11S and 11L are predicted, or the length relationship between the two wires 11S and 11L is determined in advance. It is very effective to grasp this for the optimal wiring design of the wire harness.

  The method of the above-mentioned Patent Document 1 is extremely advantageous in that the predicted shape of the linear structure can be accurately calculated in consideration of the physical characteristics of the linear structure, that is, the material and the rigidity against bending and torsion in each part. Although it is excellent, it predicts the shape and length relationship of the wire member in which the exterior member is not attached in the vicinity of the end of such a wire harness, and also calculates the swing angle of the terminal member. It was found that there is room for further improvement.

  Therefore, in view of the present situation described above, the present invention can predict the shape and length relationship of the wire rod in which the exterior member is not attached in the vicinity of the end portion of the wire harness, and can calculate the swing angle of the terminal member. It is an object to provide a method, an apparatus thereof, and a program thereof.

The method for calculating a predicted shape of a wire rod according to claim 1, which has been made to solve the above-described problem, uses a computer including a finite element model creating means, a predicted shape calculating means, and a result output means. A method of calculating a predicted shape of a short wire and a long wire longer than that of a short wire in which an exterior member that bundles a plurality of wires constituting the wire harness is not attached using the method, and the finite element model creating means A short wire length that is a distance from one end of the short wire to a fixed end, a long wire length that is a distance from one end to the fixed end of the long wire, and a width between the fixed ends of the short wire and the long wire. A finite element model that creates a finite element model corresponding to an elastic body in which a plurality of beam elements are combined with the short wire, the long wire, and a member connecting the fixed ends with reference to a fixed end width. Element mode And Le forming step, by the predicted shape calculating unit, the finite element given model, the short wire length, said length wire length, the fixed end width and the short wire other than the above, the long wire, and the A predicted shape calculation step for calculating a predicted shape which is a physically balanced state of the finite element model according to physical properties and constraint conditions of the member, and a calculation result in the predicted shape calculation step by the result output means. A result output step for outputting, and in the predicted shape calculation step, one end of the short wire and one end of the long wire are forcibly displaced so as to coincide with a non-mounting start portion of the exterior member, respectively. The predicted shape of the short wire and the long wire is calculated.

Moreover, the predicted shape calculation method for a wire according to claim 2 made to solve the above problem is the predicted shape calculation method for a wire according to claim 1, wherein the computer further includes a swing angle calculation means, A swing angle calculation step of obtaining, as the swing angle, an angle formed by a line connecting the fixed ends in a predetermined reference shape and a line connecting the fixed ends in the predicted shape by the swing angle calculation means. It is further characterized by including.

  In addition, the wire shape predicted shape calculation device according to claim 3, which has been made to solve the above-described problem, uses the finite element method, and the exterior member that bundles a plurality of wire materials constituting the wire harness is in a non-mounted state. An apparatus for calculating a predicted shape of a short wire and a longer long wire, the short wire length being a distance from one end of the short wire to a fixed end, and a length being a distance from one end of the long wire to a fixed end With reference to a wire length and a fixed end width that is a width between fixed ends of the short wire and the long wire, a plurality of beam elements are connected to the short wire, the long wire, and a member connecting the fixed ends. Finite element model creating means for creating a finite element model corresponding to the coupled elastic body, the short wire length, the long wire length, the fixed end width given to the finite element model, and these Other than the short wire, A predicted shape calculating means for calculating a predicted shape which is a physically balanced state of the finite element model according to the physical properties and constraint conditions of the wire, and the member, and a calculation result in the predicted shape calculating means is output. Including a result output means, and in the predicted shape calculation means, the one end of the short wire and the one end of the long wire are forcibly displaced so as to coincide with the non-mounting start portion of the exterior member, The predicted shape of the short wire and the long wire is calculated.

  The wire shape predicted shape calculation program according to claim 4, which has been made to solve the above problem, uses a finite element method, and the exterior member for bundling a plurality of wire materials constituting the wire harness is not attached. In order to calculate the predicted shape of the short wire and the longer wire, the computer is used to calculate the short wire length, which is the distance from one end of the short wire to the fixed end, and the distance from one end of the long wire to the fixed end. With reference to the long wire length and the fixed end width which is the width between the short wire and the fixed end of the long wire, the short wire, the long wire, and a member connecting between the fixed ends, a plurality of beam elements Finite element model creating means for creating a corresponding finite element model as an elastic body coupled thereto, the short wire length given to the finite element model, the long wire length, the fixed end width, and these Before Predicted shape calculation means for calculating a predicted shape which is a physically balanced state of the finite element model according to physical characteristics and constraint conditions of the short wire, the long wire, and the member, and calculation in the predicted shape calculation means In the predicted shape calculation means, the one end of the short wire and the one end of the long wire are forcibly displaced so as to coincide with the non-mounting start portion of the exterior member. The predicted shape of the short wire and the long wire is calculated.

Moreover, the predicted shape calculation method for a wire according to claim 5, which has been made to solve the above problem, uses a computer including a finite element model creation means, a predicted shape calculation means, and a result output means. Using the finite element method, a method for calculating a predicted shape of a short wire and a long wire longer than the short wire in which an exterior member that bundles a plurality of wires constituting the wire harness is not attached, and creating the finite element model Based on the short wire length, which is the distance from one end of the short wire to the fixed end, the fixed end width, which is the width between the short wire and the fixed end of the long wire, the short wire length, and the fixed end width. With reference to a long wire length that is a distance from one end of the long wire calculated to the fixed end, a plurality of beam elements are joined to the short wire, the long wire, and a member connecting the fixed ends. As an elastic body A finite element model creation step of creating a finite element model corresponding thereto, by the predicted shape calculating unit, the finite element given model, the wire length, the fixed end width and the short wire other than the above, A predicted shape calculation step of calculating a predicted shape that is a physically balanced state of the finite element model according to the physical characteristics and constraint conditions of the long wire material and the member, and the predicted shape by the result output unit A result output step of outputting a calculation result in a calculation step, and in the predicted shape calculation step, the short wire when the member is forcibly displaced to rotate by an angle given as a swing angle, and The predicted shape of the long wire is calculated.

Moreover, the prediction shape calculation method of the wire of Claim 6 made | formed in order to solve the said subject is as follows.
6. The predicted shape calculation method for a wire according to claim 5 , wherein the computer further includes a line length difference calculating unit, and the line length difference calculating unit causes one end of the short wire in the predicted shape to be extracted from the exterior member. Line length difference calculation for obtaining the distance between one end of the long wire rod and the non-mounting start portion of the long wire rod from the exterior member as the line length difference between the two wire rods when matched with the non-mounting start portion of the short wire rod The method further includes a step.

  In addition, the wire shape predicted shape calculation apparatus according to claim 7, which has been made to solve the above-described problem, uses the finite element method, and the exterior member that bundles a plurality of wire materials constituting the wire harness is in a non-mounted state. An apparatus for calculating a predicted shape of a short wire and a long wire longer than the short wire, a short wire length which is a distance from one end of the short wire to a fixed end, a width between the short wire and a fixed end of the long wire With reference to a long wire length, which is a distance from one end of the long wire calculated to the fixed end, based on a fixed end width, the short wire length, and the fixed end width, the short wire, the long wire, and A member connecting the fixed ends as an elastic body in which a plurality of beam elements are combined, a finite element model creating means for creating a finite element model corresponding to the elastic body, and the wire length given to the finite element model The fixed end width, and Predicted shape calculation means for calculating a predicted shape that is a physically balanced state of the finite element model according to the physical characteristics and constraint conditions of the short wire material, the long wire material, and the member other than these, and A result output means for outputting a calculation result in the predicted shape calculation means, wherein the predicted shape calculation means causes the short when the member is forcibly displaced to rotate by an angle given as a swing angle. A predicted shape of the wire and the long wire is calculated.

  In addition, the wire shape predicted shape calculation program according to claim 8, which has been made to solve the above-described problem, uses a finite element method, and the exterior member for bundling a plurality of wires constituting the wire harness is in a non-mounted state. In order to calculate the predicted shape of the short wire and the longer long wire, the computer calculates the short wire length, which is the distance from one end of the short wire to the fixed end, the width between the short wire and the fixed end of the long wire. With reference to the long wire length, which is the distance from one end of the long wire calculated to the fixed end, based on the fixed end width, the short wire length and the fixed end width, the short wire, the long wire, And a member connecting the fixed ends as an elastic body in which a plurality of beam elements are combined, a finite element model creating means for creating a finite element model corresponding thereto, and the wire length given to the finite element model The above Predicted shape calculation that calculates a predicted shape that is a physically balanced state of the finite element model according to the fixed width and the physical characteristics and constraint conditions of the short wire material, the long wire material, and the member other than these. Means for outputting the calculation result in the predicted shape calculation means, and the predicted shape calculation means when the member is forcibly displaced to rotate by a given angle as a swing angle. The predicted shapes of the short wire and the long wire are calculated.

  According to the invention of claim 1, claim 3 and claim 4, the short wire length which is the distance from one end of the short wire to the fixed end, the long wire length which is the distance from one end of the long wire to the fixed end, Referring to the fixed end width which is the width between the fixed ends of the short wire and the long wire, the short wire, the long wire, and the member connecting the fixed ends are formed as an elastic body in which a plurality of beam elements are combined. A finite element model corresponding to is created. And the predicted shape which is a physically balanced state of the finite element model according to the short wire length, long wire length, fixed end width, and other physical characteristics and constraint conditions given to this finite element model Is calculated and the calculation result is output. In particular, the predicted shapes of the short wire and long wire when one end of the short wire and one end of the long wire are forcibly displaced so as to coincide with the non-mounting start portion of the exterior member are calculated and output.

  According to the invention of claim 2, the angle formed by the line connecting the fixed ends in the predetermined reference shape and the line connecting the fixed ends in the predicted shape is obtained as the swing angle.

  According to the invention of claim 5, claim 7 and claim 8, the short wire length which is the distance from one end of the short wire to the fixed end, the width between the short wire and the fixed end of the long wire is fixed. A member connecting the short wire, the long wire, and the fixed end with reference to the long wire length, which is the distance from one end of the long wire calculated from the end width, the short wire length and the fixed end width to the fixed end, As an elastic body in which a plurality of beam elements are coupled, a finite element model corresponding to this is created. The finite element model is physically balanced according to the physical properties and restraint conditions of the wire length, fixed end width, and other short wires, long wires, and members given to the finite element model. The predicted shape is calculated and the calculation result is output. In particular, the predicted shapes of the short wire and the long wire when the member connecting the fixed ends is forcibly displaced so as to rotate by the angle given as the swing angle are calculated and output.

  According to the sixth aspect of the invention, the length relationship between the short wire and the long wire corresponding to an arbitrary swing angle of the member can be grasped.

  According to the invention of claim 1, claim 3 and claim 4, the short wire length which is the distance from one end of the short wire to the fixed end, the long wire length which is the distance from one end of the long wire to the fixed end, Referring to the fixed end width which is the width between the fixed ends of the short wire and the long wire, the short wire, the long wire, and the member connecting the fixed ends are formed as an elastic body in which a plurality of beam elements are combined. A finite element model corresponding to is created. And the predicted shape which is a physically balanced state of the finite element model according to the short wire length, long wire length, fixed end width, and other physical characteristics and constraint conditions given to this finite element model Is calculated and the calculation result is output. In particular, the predicted shapes of the short wire and long wire when one end of the short wire and one end of the long wire are forcibly displaced so as to coincide with the non-mounting start portion of the exterior member are calculated and output. Therefore, since it becomes possible to grasp the shape of both wires up to the fixed end, it is very effective for optimal wiring design of the wire harness.

  Further, according to the invention of claim 2, the angle formed by the line connecting the fixed ends in the predetermined reference shape and the line connecting the fixed ends in the predicted shape is obtained as the swing angle. This is also effective for examining terminal members attached to the ends.

  According to the invention of claim 5, claim 7 and claim 8, the short wire length which is the distance from one end of the short wire to the fixed end, the width between the short wire and the fixed end of the long wire is fixed. A member connecting the short wire, the long wire, and the fixed end with reference to the long wire length, which is the distance from one end of the long wire calculated from the end width, the short wire length and the fixed end width to the fixed end, As an elastic body in which a plurality of beam elements are coupled, a finite element model corresponding to this is created. The finite element model is physically balanced according to the physical properties and restraint conditions of the wire length, fixed end width, and other short wires, long wires, and members given to the finite element model. The predicted shape is calculated and the calculation result is output. In particular, the predicted shapes of the short wire and the long wire when the member connecting the fixed ends is forcibly displaced so as to rotate by the angle given as the swing angle are calculated and output. Therefore, it becomes possible to grasp the shapes of the two wires up to the fixed end corresponding to an arbitrary swing angle of the member, which is very effective for optimal wiring harness wiring design.

  In addition, according to the invention described in claim 6, since the length relationship between the short wire and the long wire corresponding to the arbitrary swing angle of the member can be grasped, the examination of the constituent wire of the wire harness, etc. It becomes effective.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, in order to understand the present invention more accurately, an example of a wire harness composed of a plurality of wires including a short wire and a long wire that are objects of shape prediction and a representative example will be described with reference to FIGS. 1 and 2. The support member will be described. FIG. 1 is a diagram schematically illustrating an example of a wire harness. 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, for example, connectors 2a, 2b, 2c, and 2d connected to electrical components (not shown) are attached to both ends of the wire harness 1, and various clips 3a, 3b, 3c, and 3d are attached to an intermediate portion thereof. Furthermore, it has a branch point 4. Since each branch line of the wire harness 1 basically has a different number and type of constituent wires, 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. In addition, 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 restriction is set for each node when calculating the predicted path of the wire harness or wire.

  In addition, the short wire and long wire used as the object of the shape prediction mentioned later exist in the vicinity of the connector 2a in FIG. 1, for example.

  Next, with reference to FIG. 4 to FIG. 6, an assumption condition, a theory to be used, and an outline of a basic formula, which are prerequisites in the present invention, will be described. 4A is a diagram illustrating an appearance of the wire, FIG. 4B is a diagram illustrating a state where the wire of FIG. 4A is discretized, and FIG. 4C is a diagram illustrating FIG. It is the figure which represented the wire of (A) with the beam element and the node. FIG. 5 is a diagram for explaining the degree of freedom in the wire represented by beam elements and nodes. FIG. 6A is a diagram showing a wire rod with three beam elements, and FIG. 6B is a diagram showing a state in which the three beam elements in FIG. 6A are coupled. Note that a wire harness in which a plurality of wires are bundled can also be handled in the same manner as a wire by considering it as one wire.

First, the following assumptions are made when the finite element method is used to predict the shape of the wire.
(1). Assume that the wire is an elastic body.
(2). Assume that the wire is a combination of beam elements.
(3). Assume that each beam element is kept linear.

  Note that assuming the beam element also means that the wire 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 is assumed to have a circular cross section.

  By making such an assumption, the finite element method can be applied to the wire.

  First, the wire is discretized. That is, as shown to FIG. 4 (A), the wire 11 can be considered as a continuous body. Next, as shown in FIG. 4B, such a wire 11 is divided (discretized) into several beam elements C1, C2, C3,. That is, since the wire is like a single rope, it can be considered that a finite number of beam elements are connected.

  Therefore, as shown in FIG. 4C, the wire can be expressed as a plurality of beam elements C1, C2, C3,... Connected by a plurality of nodes N1, N2, N3,. The characteristic values required for the beam elements are as follows.

Length l (see Fig. 4 (B))
Cross section A (See Fig. 4 (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.

  As shown in FIG. 5, 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 rod, the equilibrium equation of the finite element method generally takes the form of the following equation.
([K] + [K _G ]) {x} = {F} (1)
Here, [K]: Overall stiffness matrix, [K _G ]: Overall geometric stiffness matrix, {x}:
Displacement vector, {F}: Load vector (also called 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, the wire is represented by three beam elements C1, C2, and C3 as shown in FIG. 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. 6B by satisfying the condition of the continuity of displacement and the balance of forces.

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. 6B 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 way, a mathematical model of a wire 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, by obtaining each element of the displacement vector {x} based on the above (3) and formula (4), the predicted shape of the path, that is, the wire can be calculated. 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. 7A is a diagram showing a state of measuring the cross-sectional secondary moment and the longitudinal elastic modulus, and FIG. 7B is a diagram showing a state of measuring the cross-sectional secondary polar moment and the transverse elastic modulus. .

  First, the length l, the cross-sectional area A, and the density ρ can be obtained by simple calculation after measuring the target wire using a caliper, a measure, a weight scale, or the like.

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)

Further, the cross-sectional secondary moment I can be expressed by the following equation (6) because the wire is assumed to have a circular cross-section as described above.
^{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.

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-sectional secondary pole moment J can be expressed by the following formula (9) because the wire 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.

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

  In addition, the said measuring method is an example, You may make it acquire each value of the transverse elastic modulus G and the longitudinal elastic modulus E by methods other than the said measuring example.

  Next, a hardware configuration according to the present invention for calculating and outputting a predicted shape of a wire according to a processing procedure described later using the above theory, basic formula, and measurement 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.

  The storage device 25 is a hard disk drive that stores the installed predicted shape calculation program 29a according to the present invention and the processing results of the program 29a. The communication interface 26 is connected to an external device such as the Internet or the like. A modem board for performing data communication using a LAN line or the like. The read / write device 27 is a device that reads a predicted shape calculation program 29a 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 predicted shape calculation program 29a to the recording medium 29. Each of these components is connected via an internal bus 28.

  The microcomputer 21 installs the predicted shape calculation 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 a boot program stored in the ROM 21b and starts up the installed predicted shape calculation program 29a. The microcomputer 21 performs processing related to wire shape prediction according to the predicted shape calculation 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. The predicted shape calculation 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 apparatus. Note that the predicted shape calculation 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.

  The hardware exemplified above is common to the following first and second embodiments.

[First embodiment]
Subsequently, a processing procedure according to the first embodiment of the present invention will be described with reference to FIGS. 9 and 10. FIG. 9 is a flowchart showing a processing procedure according to the first embodiment of the present invention. 10 (A) to 10 (D) are diagrams showing states in which the wire is deformed in accordance with the processing steps shown in FIG. Here, the vicinity of the end of the wire harness as shown in FIG. 3 is assumed. In this embodiment, basically, when the length of the short wire 11S, the length of the long wire 11L, and the fixed end width of the terminal member 20 are given, the short wire 11S, the predicted shape of the long wire 11L, and the terminal The swing angle of the member 20 is obtained.

  First, in step S101 and step S102 shown in FIG. 9, the wire length and the fixed end width are designated, respectively. As shown in FIG. 10A, the wire length is a short wire length XS that is the length of the short wire 11S in which the exterior member 12 (see FIG. 3) that bundles a plurality of wires constituting the wire harness is not attached. This is the long wire length XL which is the length of the long wire 11L longer than this. The fixed end width W is a distance between the connection portions 20S and 20L of the terminal member 20. The wire length and the fixed end width may be manually input using the input device 22 or CAD data may be used.

  Subsequently, in step S103, as shown in FIG. 10B, a finite element model corresponding to the wire rods 11S and 11L and the terminal member 20 shown in FIG. The 11S ′, 11L ′, and 20 ′ in FIG. 10B correspond to the wire rods 11S, 11L and the terminal member 20 in FIG. 10A, respectively.

  Specifically, 11S ′ is a wire 11S represented by a plurality of beam elements joined at nodes 1a0, 1a1, 1a2, 1a3, 1a4, and 1a5. 11L ′ is a wire 11L represented by a plurality of beam elements joined at nodes 1a10, 1a11, 1a12, 1a13, 1a14, 1a15, 1a16, and 1a17. Reference numeral 20 ′ denotes the terminal member 20 represented by nodes 1a6, 1a7, 1a8, and 1a9. Each node is assigned an end portion of the wire rods 11S and 11L, a connection portion 20S and 20L of the terminal member 20, and the like. Step S103 corresponds to the finite element model creating step and the finite element model creating means in claims 1 to 4.

  Subsequently, in step S104, constraint conditions, external parameters, non-external parameters, etc. are set for the finite element model expressed as described above. As the constraint conditions set here, for each of the nodes 1a0 to 1a17, the constraint type (complete constraint, rotational constraint, complete freedom, etc.) as shown in FIG. 2, coordinates corresponding to the initial shape, and the like are set. The Specifically, complete restriction is set as a restriction type for the nodes 1a0 and 1a17 (however, the node 1a17 is a control point that is forcibly displaced), and complete freedom is set as a restriction type for the nodes 1a0 and 1a17. Each value set here relates to each element in the displacement vector {x} in the above equation (3).

  Further, as the external parameters set in step S104, the cross-sectional area A which is a parameter other than the lengths XS and XL and the width W which have already been specified is set, and as the non-external parameters, the cross-sectional secondary moment I, the cross-section The secondary pole moment J, Poisson's ratio μ, density ρ, longitudinal elastic modulus E, and transverse elastic modulus G are set. Supplementally, external parameters and non-external parameters corresponding to the wire 11S are set for the nodes 1a0 to 1a5, and external parameters and non-external parameters corresponding to the wire 11L are set for the nodes 1a10 to 1a17. In 1a9, external parameters and non-external parameters corresponding to the terminal member 20 are set. For these, values measured or obtained 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 external parameter and the non-external parameter correspond to the physical characteristics in the claims. Although not shown, various control values related to this calculation are also set.

  Subsequently, in step S105, a predicted shape which is a physically balanced state of the finite element model according to such a set value, that is, an initial shape 1a as shown in FIG. 10B is calculated.

  Here, the constraint condition is set so that the target wire has an initial shape that is straightened, but the constraint condition may be set so that the initial shape is a different shape. For example, when a wire harness taken out from a container is routed to a vehicle, the initial shape changes depending on how the wire harness or wire is bent in the container. By reflecting such a bent initial shape as a starting point in the predicted shape, a more realistic predicted shape can be calculated.

  Note that it is not always necessary to use the finite element method in order to calculate the initial shape. In any case, it is preferable to output an initial shape that reflects the shape of the target wire before assembly. The shape calculation process is performed by the microcomputer 21, the input device 22 is used to set each value, and the display device 23 and / or the printing device 24 are used to output the predicted shape. In the subsequent processes, the shape calculation process 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.

  Subsequently, in step S106, the base of the long wire 11L is forcibly displaced to the reference position. That is, as indicated by an arrow in FIG. 10C, the node 1a17 corresponding to the root of the long wire 11L is forcibly displaced to a position corresponding to the reference position. The reference position corresponds to the non-mounting start portion R from the exterior member 12 of the wire rods 11S and 11L.

  Subsequently, in step S107, a predicted shape 1z as shown in FIG. In this calculation, the values set in step S101, step S102, and step S104 are applied except that the node 1a17 is forcibly displaced to the reference position. Note that the nodes 1z0, 1z1, 1z2, 1z3, 1z4, 1z5, 1z6, 1z7, 1z8, 1z9, 1z10, 1z11, 1z12, 1z13, 1z14, 1z15, 1z16, and 1z17 shown in FIG. It shows that the nodes 1a0, 1a1, 1a2, 1a3, 1a4, 1a5, 1a6, 1a7, 1a8, 1a9, 1a10, 1a11, 1a12, 1a13, 1a14, 1a15, 1a16 and 1a17 shown in FIG. 10 (B) are displaced. . Step S107 corresponds to the predicted shape calculation step and the predicted shape calculation means in claims 1 to 4.

In step S108, the swing angle θt of the terminal member 20 is calculated. As described with reference to FIG. 3, the swing angle θt is an angle formed by the line K connecting the connection portions 20S and 20L and the non-mounting start portion R. It may be an angle formed with the reference line. Step S108 corresponds to the swing angle calculation step and swing angle calculation means in claim 2 .

  In step S109, the result calculated as described above is output to the display device 23 in a shape conforming to the predicted shape 1z shown in FIG. That is, the predicted shape 1z shown in FIG. 10D is replaced with a wire or terminal member as shown in FIG. The calculation result is preferably output not only to the display device 23 but also to the printing device 24 or recorded on the recording medium 29. In addition, it is preferable to output the shape according to the initial shape 1a to the display device 23.

  As described above, according to the first embodiment of the present invention, when the length of the short wire 11S, the length of the long wire 11L, and the fixed end width of the terminal member 20 are given, the short wire 11S and the long wire 11L are provided. The predicted shape and the swing angle of the terminal member 20 can be obtained. Therefore, since the shape of the wire material leading to the terminal member 20 and the swing angle of the terminal member 20 can be grasped, it is very effective for optimal wiring design of the wire harness. Further, it is also effective for examining the terminal member 20.

[Second Embodiment]
Subsequently, a processing procedure according to the second embodiment of the present invention will be described with reference to FIGS. 11 and 12. FIG. 11 is a flowchart showing a processing procedure according to the second embodiment of the present invention. 12 (A) to 12 (D) are diagrams showing a state where the wire is deformed in accordance with each processing step of FIG. Here, the vicinity of the end of the wire harness as shown in FIG. 3 is assumed. In this embodiment, basically, when the fixed end width of the terminal member 20, the swing angle, and the default length of the short wire are given, the short wire, the predicted shape of the long wire, and the wire length of the short wire and the long wire Difference is required.

  First, in step S201 and step S202 shown in FIG. 11, a swing angle and a fixed end width are designated, respectively. As described with reference to FIG. 3, the swing angle is, for example, an angle formed by a line K connecting the connection portions 20 </ b> S and 20 </ b> L and the non-mounting start portion R. Here, as shown in FIG. 12A, it is assumed that the final swing angle θr is designated. The fixed end width W is a distance between the connection portions 20S and 20L of the terminal member 20. The designation of the swing angle and the fixed end width may be manually input using the input device 22 or CAD data may be used.

  Subsequently, in step S203, the default length XS is specified for the short wire 11S, and based on this, the line length of the long wire 11L (for example, default length XS + fixed end width W) is specified. As a default length of the short wire, a wire length in a state where a normally assumed exterior member is not attached is appropriately set. Moreover, although the wire length of the long wire 11L is the default length XS + the fixed end width W of the short wire 11S, it may be another wire length longer than the short wire 11S.

  Subsequently, in step S204, a finite element model corresponding to the wire rods 11S and 11L and the terminal member 20 shown in FIG. 12A is created as shown in FIG. The 11S ′, 11L ′, and 20 ′ in FIG. 12B correspond to the wire rods 11S, 11L and the terminal member 20 in FIG.

  Specifically, 11S ′ is represented by a plurality of beam elements in which a wire 11S having a line length XS is coupled at nodes 1a0, 1a1, 1a2, 1a3, 1a4, and 1a5. Further, 11L ′ is a wire 11L having a wire length XS + W represented by a plurality of beam elements joined at nodes 1a10, 1a11, 1a12, 1a13, 1a14, 1a15, 1a16, and 1a17. Reference numeral 20 'denotes a terminal member 20 having a width W represented by nodes 1a6, 1a7, 1a8, and 1a9. Each node is assigned an end portion of the wire rods 11S and 11L, a connection portion 20S and 20L of the terminal member 20, and the like. Step S204 corresponds to the finite element model creating step and the finite element model creating means in claims 5-8.

  Subsequently, in step S205, constraint conditions, external parameters, non-external parameters, etc. are set for the finite element model expressed as described above. As the constraint conditions set here, for each of the nodes 1a0 to 1a17, the constraint type (complete constraint, rotational constraint, complete freedom, etc.) as shown in FIG. 2, coordinates corresponding to the initial shape, and the like are set. The Specifically, complete restriction is set as a restriction type for the nodes 1a0 and 1a17 (however, the node 1a17 is a control point that is forcibly displaced), and complete freedom is set as a restriction type for the nodes 1a0 and 1a17. Each value set here relates to each element in the displacement vector {x} in the above equation (3).

  In addition, the cross-sectional area A, which is a parameter other than the lengths XS, XS + W, and the width W that have already been specified, is set as the outer shape parameter set in step S205, and the cross-sectional secondary moment I, the cross-section moment are set as the non-outer shape parameters. The secondary pole moment J, Poisson's ratio μ, density ρ, longitudinal elastic modulus E, and transverse elastic modulus G are set. Supplementally, external parameters and non-external parameters corresponding to the wire 11S are set for the nodes 1a0 to 1a5, and external parameters and non-external parameters corresponding to the wire 11L are set for the nodes 1a10 to 1a17. In 1a9, external parameters and non-external parameters corresponding to the terminal member 20 are set. For these, values measured or obtained 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 external parameter and the non-external parameter correspond to the physical characteristics in the claims. Although not shown, various control values related to this calculation are also set.

  Subsequently, in step S206, a predicted shape that is in a physically balanced state of the finite element model, that is, an initial shape 1a as shown in FIG.

  Here, the constraint condition is set so that the target wire has an initial shape that is straightened, but the constraint condition may be set so that the initial shape is a different shape. Further, it is not always necessary to use the finite element method in order to calculate the initial shape. In any case, it is preferable to output an initial shape that reflects the shape of the target wire before assembly. The shape calculation process is performed by the microcomputer 21, the input device 22 is used to set each value, and the display device 23 and / or the printing device 24 are used to output the predicted shape. In the subsequent processes, the shape calculation process 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.

  Subsequently, in step S207, the root of the long wire 11L is forcibly displaced by a predetermined amount. That is, as indicated by an arrow in FIG. 12C, the node 1a17 corresponding to the base of the long wire 11L is forcibly displaced so as to be pushed out to the node 1b17. The forced displacement amount needs to prevent the current swing angle θt (current swing angle) from exceeding the specified swing angle θr (designated swing angle) at once. For example, the forced displacement amount of the node 1a17 is set so that the swing angle θt reaches the swing angle θr when displaced about 10 to 30 times.

  The nodes 1b0, 1b1, 1b2, 1b3, 1b4, 1b5, 1b6, 1b7, 1b8, 1b9, 1b10, 1b11, 1b12, 1b13, 1b14, 1b15, 1b16, and 1b17 shown in FIG. It shows that the nodes 1a0, 1a1, 1a2, 1a3, 1a4, 1a5, 1a6, 1a7, 1a8, 1a9, 1a10, 1a11, 1a12, 1a13, 1a14, 1a15, 1a16 and 1a17 shown in FIG. .

  Then, until the angle difference between the current swing angle θt and the designated swing angle θr falls within a predetermined allowable range (step S209, step S210, step S211), the node 1a17 corresponding to the root of the long wire 11L is pushed out. Such calculation of forced displacement and predicted shape (step S207, step S208) or calculation of forced displacement and predicted shape (step S212, step S213) for pulling back node 1a17 is repeated. Note that the forced displacement that pulls back the node 1a17 in step S212 is the forced displacement in the opposite direction to the forced displacement that pushes out in step S207, but the displacement amount during the pull-back process is to end the process. Each time the pull-back process is repeated, the amount of displacement is gradually reduced. Steps S208 and S213 correspond to the predicted shape calculation step and the predicted shape calculation means in claims 5-8.

If it is determined in step S210 or step S211 that the angle difference between the current swing angle θt and the specified swing angle θr falls within a predetermined allowable range (Y in step S210 or Y in step S211), step S214 Proceed to, and the wire length difference between both wires is calculated. In step S215, the difference between the wire lengths calculated in step S214 and the predicted shape calculated in steps S208 and S213 are output. Step S214 corresponds to the line length difference calculating step and the line length difference calculating means in claim 6 .

  When the angle difference between the current swing angle θt and the designated swing angle θr falls within a predetermined allowable range, the finite element model is physically predicted with a predicted shape 1z as shown in FIG. It will be in a state that is balanced. Nodes 1z0, 1z1, 1z2, 1z3, 1z4, 1z5, 1z6, 1z7, 1z8, 1z9, 1z10, 1z11, 1z12, 1z13, 1z14, 1z15, 1z16 and 1z17 shown in FIG. B) indicates that the nodes 1a0, 1a1, 1a2, 1a3, 1a4, 1a5, 1a6, 1a7, 1a8, 1a9, 1a10, 1a11, 1a12, 1a13, 1a14, 1a15, 1a16, and 1a17 are displaced.

  The wire length difference between the long wire 11L and the short wire 11S can be calculated as XD in FIG. In the output of the calculation result in step S215, a shape conforming to the predicted shape 1z shown in FIG. That is, the predicted shape 1z shown in FIG. 12D is replaced with a wire or terminal member as shown in FIG. The calculation result is preferably output not only to the display device 23 but also to the printing device 24 or recorded on the recording medium 29. In addition, it is preferable that a shape according to the initial shape 1 a or the predicted shape 1 b in the middle is also output to the display device 23.

  Thus, according to the second embodiment of the present invention, when the fixed end width of the terminal member 20, the swing angle, and the default length of the short wire are given, the short wire, the predicted shape of the long wire, and the short wire And the wire length difference of a long wire can be calculated | required. Therefore, since it becomes possible to grasp the shapes of both wires corresponding to an arbitrary swing angle of the terminal member 20 up to the fixed end, it is very effective for optimal wiring harness wiring design. Moreover, it becomes effective also for the examination of the constituent wire material of a wire harness, etc.

  In addition, this invention is applicable similarly when not only the illustrated short wire and long wire, but three or more wires are connected to the terminal member. In this case, the terminal member corresponds to three or more wires such as a connector. As shown in FIG. 13, the finite element model can be represented by a portion 20 ′ corresponding to a terminal member such as a connector, a portion 11S ′ corresponding to each wire, and the like. Assignment of nodes and beam elements, constraint conditions, external parameters, non-external parameters, and the like can also be set in the same manner as in the first and second embodiments. For example, the predicted shape and the swing angle when the nodes 1a0, 1a19, 1a20, and 1a18 are forcibly displaced to the non-mounting start portion R can be similarly obtained.

  Further, the present invention can be similarly applied not only to a wire having a circular cross section but also to a wire having a rectangular cross section, an annular cross section, an elliptic cross section, an H cross section, and the like. That is, the wire to which the present invention is applied is not limited to a circular cross section.

It is a figure which shows the example of a wire harness roughly. It is a figure which shows the relationship between the typical support member attached to a wire harness, and a freedom degree of restraint. It is a figure which shows the edge part vicinity of a wire harness. 4A is a diagram illustrating an appearance of the wire, FIG. 4B is a diagram illustrating a state where the wire of FIG. 4A is discretized, and FIG. 4C is a diagram illustrating FIG. It is the figure which represented the wire of (A) with the beam element and the node. It is a figure for demonstrating the freedom degree in the wire represented with the beam element and the node. FIG. 6A is a diagram showing a wire rod with three beam elements, and FIG. 6B is a diagram showing a state in which the three beam elements in FIG. 6A are coupled. FIG. 7A is a diagram showing a state of measuring the cross-sectional secondary moment and the longitudinal elastic modulus, and FIG. 7B is a diagram showing a state of measuring the cross-sectional secondary polar moment and the transverse elastic modulus. . It is a block block diagram which shows an example of the hardware constitutions which concern on all embodiment. It is a flowchart which shows the process sequence which concerns on 1st Embodiment of this invention. 10 (A) to 10 (D) are diagrams showing states in which the wire is deformed in accordance with the processing steps shown in FIG. It is a flowchart which shows the process sequence which concerns on 2nd Embodiment of this invention. 12 (A) to 12 (D) are diagrams showing a state where the wire is deformed in accordance with each processing step of FIG. It is a figure for demonstrating the example of application of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wire harness 2a, 2b, 2c, 2d Connector 3a, 3b, 3c, 3d Clip 4 Branch point 11 Wire material 20 Terminal member 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-C7 Beam element N1-N8 Node (node)

Claims (8)

Using a computer equipped with a finite element model creation means, a predicted shape calculation means, and a result output means, the exterior member that bundles a plurality of wires constituting the wire harness is not attached using the finite element method A method for calculating a predicted shape of a short wire and a longer wire longer than
By the finite element model creating means , a short wire length that is a distance from one end of the short wire to a fixed end, a long wire length that is a distance from one end of the long wire to a fixed end, and the short wire and the long wire With reference to the fixed end width, which is the width between the fixed ends of the above, the short wire, the long wire, and the member connecting the fixed ends are handled as an elastic body in which a plurality of beam elements are combined. A finite element model creation process for creating a finite element model;
Given to the finite element model by the predicted shape calculation means, the short wire length, the long wire length, the fixed end width, and other physical properties of the short wire, the long wire, and the member other than these A predicted shape calculation step of calculating a predicted shape which is a physically balanced state of the finite element model according to the constraint condition;
A result output step of outputting a calculation result in the predicted shape calculation step by the result output means ,
In the predicted shape calculation step,
One end of the short wire and one end of the long wire are calculated by predicting the short wire and the predicted shape of the long wire when forcedly displaced so as to coincide with the non-mounting start portion of the exterior member,
A method for calculating a predicted shape of a wire. In the prediction shape calculation method of the wire according to claim 1,
The computer further comprises a swing angle calculation means,
A swing angle calculation step of obtaining, as the swing angle, an angle formed by a line connecting the fixed ends in a predetermined reference shape and a line connecting the fixed ends in the predicted shape by the swing angle calculation means. In addition,
A method for calculating a predicted shape of a wire. Using the finite element method, an apparatus for calculating a predicted shape of a short wire and a long wire longer than the short wire in which the exterior member that bundles a plurality of wires constituting the wire harness is in an unmounted state,
The short wire length, which is the distance from one end of the short wire to the fixed end, the long wire length, which is the distance from one end of the long wire to the fixed end, and the width between the short wire and the fixed end of the long wire. A finite element that creates a finite element model corresponding to the short wire, the long wire, and a member connecting the fixed ends as an elastic body in which a plurality of beam elements are coupled with reference to the fixed end width. Model creation means;
The short wire length, the long wire length, the fixed end width given to the finite element model, and the other short wire, the long wire, and the physical properties and constraint conditions of the member, A predicted shape calculation means for calculating a predicted shape which is a physically balanced state of the finite element model;
A result output means for outputting a calculation result in the predicted shape calculation means,
In the predicted shape calculation means,
Calculate the predicted shape of the short wire and the long wire when one end of the short wire and the one end of the long wire are forcibly displaced so as to coincide with the non-mounting start portion of the exterior member, respectively.
An apparatus for calculating a predicted shape of a wire. In order to calculate a predicted shape of a short wire and a longer wire longer than this by using a finite element method, an exterior member that bundles a plurality of wires constituting the wire harness is not attached.
The short wire length, which is the distance from one end of the short wire to the fixed end, the long wire length, which is the distance from one end of the long wire to the fixed end, and the width between the short wire and the fixed end of the long wire. A finite element that creates a finite element model corresponding to the short wire, the long wire, and a member connecting the fixed ends as an elastic body in which a plurality of beam elements are coupled with reference to the fixed end width. Model creation means,
The short wire length, the long wire length, the fixed end width given to the finite element model, and the other short wire, the long wire, and the physical properties and constraint conditions of the member, A predicted shape calculation means for calculating a predicted shape which is a physically balanced state of the finite element model;
Function as a result output means for outputting a calculation result in the predicted shape calculation means,
In the predicted shape calculation means,
One end of the short wire and one end of the long wire are calculated for each of the predicted shapes of the short wire and the long wire when forcedly displaced so as to coincide with the non-mounting start portion of the exterior member.
A predictive shape calculation program for a wire rod characterized by that. Using a computer equipped with a finite element model creation means, a predicted shape calculation means, and a result output means, the exterior member that bundles a plurality of wires constituting the wire harness is not attached using the finite element method A method for calculating a predicted shape of a short wire and a longer wire longer than
By the finite element model creating means , a short wire length that is a distance from one end of the short wire to a fixed end, a fixed end width that is a width between the short wire and the fixed end of the long wire, the short wire length and the Referring to a long wire length that is a distance from one end of the long wire calculated to the fixed end based on a fixed end width, a plurality of members connecting the short wire, the long wire, and the fixed end A finite element model creating step for creating a finite element model corresponding to the elastic body combined with the beam elements;
According to the predicted shape calculation means according to the physical properties and constraint conditions of the wire length, the fixed end width, and the other short wire, the long wire, and the member given to the finite element model. A predicted shape calculation step of calculating a predicted shape which is a physically balanced state of the finite element model;
A result output step of outputting a calculation result in the predicted shape calculation step by the result output means ,
In the predicted shape calculation step,
Calculating the predicted shape of the short wire and the long wire when the member is forcibly displaced to rotate by an angle given as a swing angle;
A method for calculating a predicted shape of a wire. In the method for calculating a predicted shape of a wire according to claim 5 ,
The computer further comprises a line length difference calculating means,
When the one end of the short wire in the predicted shape is matched with the non-mounting start portion of the short wire from the exterior member by the wire length difference calculating means, the end from the long wire and the exterior member A wire length difference calculating step for obtaining a distance from the non-mounting start portion of the long wire as a wire length difference between the two wires;
A method for calculating a predicted shape of a wire. Using the finite element method, an apparatus for calculating a predicted shape of a short wire and a long wire longer than the short wire in which the exterior member that bundles a plurality of wires constituting the wire harness is in an unmounted state,
Calculated based on the short wire length which is the distance from one end of the short wire to the fixed end, the fixed end width which is the width between the short wire and the fixed end of the long wire, the short wire length and the fixed end width. An elastic body in which a plurality of beam elements are coupled to each other with reference to a long wire length that is a distance from one end of the long wire to a fixed end, and the short wire, the long wire, and a member connecting the fixed ends. As a finite element model creation means for creating a finite element model corresponding to this,
The physical properties of the finite element model according to the physical properties and constraint conditions of the wire length, the fixed end width, and the other short wire material, the long wire material, and the member given to the finite element model. Predicted shape calculation means for calculating a predicted shape that is in balance with
A result output means for outputting a calculation result in the predicted shape calculation means,
In the predicted shape calculation means,
Calculating the predicted shape of the short wire and the long wire when the member is forcibly displaced to rotate by an angle given as a swing angle;
An apparatus for calculating a predicted shape of a wire. In order to calculate a predicted shape of a short wire and a longer wire longer than this by using a finite element method, an exterior member that bundles a plurality of wires constituting the wire harness is not attached.
Calculated based on the short wire length which is the distance from one end of the short wire to the fixed end, the fixed end width which is the width between the short wire and the fixed end of the long wire, the short wire length and the fixed end width. An elastic body in which a plurality of beam elements are coupled to each other with reference to a long wire length that is a distance from one end of the long wire to a fixed end, and the short wire, the long wire, and a member connecting the fixed ends. As a finite element model creating means for creating a corresponding finite element model,
The physical properties of the finite element model according to the physical properties and constraint conditions of the wire length, the fixed end width, and the other short wire material, the long wire material, and the member given to the finite element model. Predicted shape calculation means for calculating a predicted shape that is in balance with
Function as a result output means for outputting a calculation result in the predicted shape calculation means,
In the predicted shape calculation means,
Calculating the predicted shape of the short wire and the long wire when the member is forcibly displaced to rotate by an angle given as a swing angle;
A predictive shape calculation program for a wire rod characterized by that.

Images