JP2010117765A - System for analyzing movement pathway of wire harness - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for analyzing movement pathway of a wire harness, which predicts the range of deflection of wire harness, and determining deflection of wire harness closer to the actual value. <P>SOLUTION: In a movement pathway display system for calculating and displaying a pathway Wa of deflection of wire harness W including the outermost point Mpx using FEM analysis, a means for predicting movement range of wire harness includes a correction part 7 for correcting the pathway Wa by a regression expression determined by measuring the actual deflection of the wire harness. The correction part 7 is provided with a regression expression storage means 76 for storing a regression expression h or condition data a to f; an outermost point calculation means 77 for calculating the outermost point correction value by applying the condition data a to f to the regression expression h; and an outermost point correction means 78 for calculating a new pathway Wa corrected by applying the calculated outermost point correction value to the pathway Wa. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a linear flexible object, for example, a wire harness, which is wired while being constrained at a distance from each other by a restraining tool and performs wiring of an electric system in a manufacturing process of an apparatus such as an automobile or a home appliance that requires the electric system. , The movable range that can be forcibly moved from the reference routing path corresponding to the line-shaped analysis model composed of the node group analyzed by the FEM analysis is analyzed by the FEM analysis and displayed as the wire harness movable range surface. The wire harness movable range prediction method is used, the outermost point corresponding to an arbitrary maximum movable position in the movable range plane is selected, the movable path of the wire harness including the outermost point is displayed, and the wire is displayed. The present invention relates to a wire harness movable path display system capable of preventing interference with peripheral components due to harness vibration.

In general, the wiring of an electric system disposed inside an automobile, home appliance, or the like is connected by a wire harness. This wire harness is a long and thin linear flexible object, which is a bundle of electric wires that supply electricity to automobile equipment and electrical equipment, etc. It is stretched around.
In order to facilitate the work when connecting this wire harness, the wire harness length or It was important to consider the wire harness support. Considering this support part and how much extra length to keep, etc., it is possible to reduce the manufacturing cost and facilitate the installation work. There is a need to minimize the time required.
Therefore, a method for predicting the movable range when the wire harness swings between the restraints by FEM analysis and displaying the predicted movable range on a display means such as a liquid crystal display has been sought. The “movable range predicting method and apparatus for the wire-like structure” (Japanese Patent Application Laid-Open No. 2004-119613, hereinafter referred to as Conventional Example 1).

  In Conventional Example 1, a wire composed of a plurality of wire rods is regarded as an elastic body in which a plurality of beam elements whose linearity is maintained in a circular cross section is combined, and by calculation using FEM analysis by a computer, A method of predicting the movable range of a wire routed at a predetermined location, which is predetermined in a predetermined direction with respect to a node that is a connection point of a plurality of beam elements other than a constrained portion in a stable wire. A method for predicting the movable range of a wire-like structure is disclosed, in which the movable range of the wire when the force is applied is calculated using FEM analysis so as to satisfy the shape characteristics, material characteristics and constraint conditions of the wire.

  That is, with respect to the wire harness clamped at both ends, with the restraint position and direction as restraint conditions, the node or beam element translates in three axes and has six degrees of freedom around the three axes according to the hook law. In other words, assuming that there are 12 degrees of freedom at each node of each beam element, the shape characteristics of the length and cross-sectional area of the wire harness and the cross-sectional area, cross-sectional moment of inertia, density, longitudinal elastic modulus and transverse elastic modulus of the beam element It is assumed that a relationship corresponding to a force vector of 12 rows is established by a product of a stiffness vector of 12 rows and 12 columns corresponding to material characteristics and a displacement vector of 12 rows of translation and rotation. Then, for a wire harness in which three or more nodes are continuous, on the premise that the continuity and force of displacement between the nodes are balanced, the routing path function corresponding to the hook law of the following equation (1) The wiring route of the wire harness is analyzed.

[K] {x} = {F} Expression (1)
K: rigidity vector calculated or measured based on the above-described shape characteristics and material characteristics and corresponding to the above-described spring constant, x: displacement vector, F: force vector.

  As a result, on the premise of restraint conditions that define the restraint position and restraint direction of both ends of the wire harness, the beam element as an elastic body is interposed according to the shape characteristics and material properties of the length and circular cross-sectional shape of the wire harness. The standard routing route is analyzed in a state where the forces in the three-dimensional directions of each node are balanced, and the routing route when force is applied to the nodes, that is, gravity, engine drive, vibration during running The displacement from the standard routing route caused by the above, etc. was analyzed, and the force against the displacement became analyzable.

  As another conventional example, there is a “flexible material deformation analysis apparatus” (Japanese Patent Laid-Open No. 2005-149055, hereinafter referred to as Conventional Example 2). This conventional example 2 includes an image display means for performing graphic display imitating a three-dimensional shape of a flexible object such as a wire harness on the screen, a specific part designated on the screen of the flexible object, and a moved movement position. A coordinate value recognition means that recognizes a 3D virtual space as a 3D coordinate value, and a node setting that sets multiple nodes that divide between constrained parts including a specific part recognized for an analysis model of a flexible object In response to the movement of a specific part by FEM analysis in response to the recognized movement position and the set node three-dimensional coordinate value data using the means and the material property data, shape data and constraint conditions of the flexible object as input conditions And a deformation analysis means for analyzing the deformation of the analysis model in the initial state and creating a deformation analysis model, and for displaying a graphic display imitating the three-dimensional shape of the deformed flexible object. Analyzer is disclosed. Thus, when the connector attached to one end of the wire harness is removed, the movement path and the positional relationship with respect to surrounding interference can be confirmed.

The inventor of the present invention invented “a method and apparatus for analyzing the movable range of a wire harness” (Japanese Patent Application No. 2007-228579, hereinafter referred to as Conventional Example 3).
This conventional example 3 is “a linear analysis model in which a beam element as an elastic body is interposed between each node group in a wire harness that is constrained and arranged with a restraint at a distance from each other. On the other hand, the wire harness for analyzing the movable range for which the wire harness can be forcibly moved from the reference routing route analyzed in accordance with the shape characteristic, the material characteristic and the constraint condition of the wire harness by the FEM analysis. A movable range analysis method,

Arbitrary plural so as to form a vertex of a triangle having a straight reference line between the constraint points on both sides as a base and a line length of the analysis model as two sides on a flat analysis surface including the reference line Geometrically position each node at the vertex,
As a node analysis path to analyze whether or not the node belonging to each vertex can move from the reference routing path, each line is set with a perpendicular to the reference line from each vertex, and each vertex is set as the limit of the movable range. Analyzes the maximum movable position according to whether or not deformation of the wire harness corresponding to the shape characteristics of the wire harness, the material characteristics, and the constraint conditions can be allowed at the set position of the belonging node on the route. The present invention relates to a movable range analysis method for a wire harness, characterized in that position analysis is performed for each of a plurality of analysis surfaces rotated at predetermined rotation angles about a reference line.

  That is, as shown in FIG. 9, in the conventional example 3, the wire harness W routed on the vehicle instrument panel or the like is displayed on the personal computer 101 for analyzing the maximum movable range from the analyzed routing route. A display unit 102 as a unit and an input / output unit 106 including a keyboard 103, a mouse 104, a disk drive 105, and the like as input units are attached. The disk drive 105 is a device in which a recording medium is set for input / output.

The personal computer 101 includes a CPU, a RAM, a hard disk drive as a storage device, and the like, and operates a program stored in advance in the hard disk drive by the CPU and other means, and includes the following means. These means are constructed and processed at any time by means usually provided in a computer device such as a CPU, RAM, hard disk drive and the like.
The analysis condition storage unit 111 stores analysis conditions such as material characteristics and shape characteristics of the wire harness W and constraint conditions such as a three-dimensional coordinate value and a constraint direction of the constraint part. The routing path analyzing means 110 is constrained at a distance from each other by the restraint CL based on the analysis conditions of the analysis condition storage means 111, and a stable reference routing path of the wire harness W is formed in a line shape of the center line by FEM analysis. Analyze the analysis model. The display control unit 112 displays a three-dimensional virtual space on the screen 102a of the display unit 102 in response to the input image display data, and performs graphic display imitating a three-dimensional shape. The movable range analysis unit 120 includes a vertex setting unit 121, an analysis path setting unit 122, a movable position determination unit 123, and a movable range data creation unit 124, and is configured to be able to analyze the movable range of the wire harness.

And the said prior art example 3 operate | moves according to the flowchart which processes sequentially the movable range analysis method of a wire harness, as shown in FIG. The operation of Conventional Example 3 will be described below along the flowchart.
First, the related analysis software is loaded from the input / output unit 105 to input analysis conditions and the like, and the routing path analysis unit 110 according to the analysis conditions of the analysis condition storage unit 111 registered in advance for the wire harness W. The standard stable routing is analyzed. The analyzed routing route is displayed on the screen 102a by imitating the three-dimensional shape of the routing shape in which the display control unit 112 is fleshed in a cylindrical shape corresponding to the circular cross section of the wire harness W. And about the routing route between restraints CL1 and CL2 shown by FIG. 11, the analysis of the movable range is instruct | indicated. Then, step S101 shown in FIG. 12 is executed. In step S101, the movable range analysis unit 120 analyzes vertices forming a triangle for each of the nodes b1 to b10 for each reference plane. FIG. 10B shows this analysis state. Subsequent to step S101, step S102 is executed.

  In step S102, a perpendicular analysis path is set. This setting may be stored in a hard disk drive or stored in a memory. Next, step S103 is executed.

In step S103, on the analysis path set in step S102, the outermost movable positions Mh111 to Mh1011 where the movement of the belonging nodes b1 to b10 are permitted from the reference routing path are analyzed by FEM analysis. This state is a state shown in FIG.
In FIG. 10C, the symbol X represents the apex, and the symbol O represents the outermost movable position. That is, the nodes b1 to b10 are moved toward the apex along the analysis path to which the nodes belong, and whether or not the solution of the analysis model M1 can be obtained, that is, the limit position where the routing path function according to the above equation (1) converges Are determined as the maximum movable positions Mh111 to Mh1011 and stored in the same manner as described above. Next, step S104 is executed.

  In step S104, the maximum movable positions Mh111 to Mh1011 stored in step S103 are read out, and the maximum movable positions Mh1 to Mh10 are connected to each reference plane, and the common vertex maximum positions Mh1 to Mh10 are also connected in order. In response to the outermost movable range data, a mesh-like three-dimensional image for confirming the maximum movable range from the reference routing route is displayed on the screen 2a in a state where an arbitrary reference plane is viewed from the front. This displayed state is shown in FIG. A rotational position necessary for confirmation can be designated by the input device 104, and a front-view image of the region can be displayed.

  However, with the wire harness movable range analysis method of Conventional Example 3, the movable range in which the wire harness can swing was predicted, but the route until the wire harness swings to any one outermost point where the problem actually occurs is determined. It could not be shown, and the path of the run was unknown. For this reason, since it is difficult to predict the path in which the actual wire harness swings, there is a problem in that it is difficult to take measures in design or the like when the wire harness is actually disposed. Therefore, the inventor further invented a “wire harness movable path display system” (Japanese Patent Application No. 2008-011098, hereinafter referred to as Conventional Example 4).

Conventional example 4 will be described below.
Conventional example 4 is described in claim 1 as follows: “In a wire harness that is constrained and arranged with a restraint spaced apart from each other, a line element that is considered to have a beam element as an elastic body between each of the nodes For the above analysis model, the movable range is analyzed by analyzing the movable range in which the wire harness can be forcibly moved from the reference routing route analyzed in accordance with the shape characteristic, material characteristic and constraint condition of the wire harness by FEM analysis. In addition to the method of predicting the movable range of the wire harness that predicts and displays the movable range surface,
An outermost point automatic display means for creating and displaying a plurality of outermost points at arbitrary positions of the maximum movable position of the movable range surface of the displayed wire harness;
Outermost point route analysis condition assigning means for assigning route analysis conditions to the outermost point created and displayed;
Selection instruction means for selecting any one of the displayed outermost points;
A wire characterized by comprising: a path display means for performing FEM analysis according to an analysis condition given to the outermost point selected by the selection instruction means and displaying a vibration path of the wire harness including the outermost point. Harness moving path display system. Is disclosed.

Further, according to claim 2, the method for predicting the movable range of the wire harness is such that the linear reference line between the restraint points on both sides is a base, and the line length of the analysis model is set on a planar analysis surface including the reference line. Arbitrary multiple nodes are geometrically positioned at the vertices so as to form triangle vertices with two sides in length,
As a node analysis path for analyzing whether or not the nodes belonging to each vertex can move from the reference routing path, a perpendicular to the reference line is set from each vertex.
Whether the deformation of the wire harness corresponding to the shape characteristics, material characteristics and restraint conditions of the wire harness is allowed or not at the setting position of the belonging node on each analysis path, with the apex being the limit of the movable range, Analyze the maximum movable position,
A wire harness movable range prediction method for creating a movable range surface of a wire harness by performing analysis of the maximum movable position for each of a plurality of analysis surfaces rotated at predetermined rotation angles around a reference line. Item 4. The wire harness movable path display system according to Item 1. Is disclosed.

  This conventional example 4 is based on the wire harness movable range predicting means (FIG. 12E) described in the conventional example 3, and the movable range analysis used in the movable range predicting method of the wire harness which is the conventional example 4. The apparatus is shown in FIG. 9 and described below.

  The movable range analysis device analyzes, for example, the maximum movable range from the analyzed routing route for the wire harness that is intermittently restrained and routed in the instrument panel of the automobile or the surrounding body. Further, a display unit 102, a keyboard 103 and a mouse 104 as input units, and an input / output unit 105 such as an input / output disk drive 106 in which a recording medium such as a CD is set are attached. In addition, the following units are configured by incorporating a CPU, a memory, and the like and operating according to a program.

  That is, the analysis condition storage means 111 for storing analysis conditions such as the material characteristics and shape characteristics of the wire harness, the constraint conditions such as the three-dimensional coordinate value and the constraint direction of the constraint part, and the mutual spacing between the constraint tools based on the analysis conditions The routing path analyzing means 110 for analyzing a stable reference routing path of the wire harness that is restrained by the FEM analysis with respect to the line-shaped analysis model of the center line, and the display unit 102 in response to the input image display data A display control unit 112 that performs graphic display imitating a three-dimensional shape in a three-dimensional virtual space of the screen 102a, a movable range analyzing unit 120 that analyzes a movable range of the wire harness, and a wire harness movable path display unit 130 Is done.

  This movable range analysis unit forms triangular vertices with the base line of the straight line between the constraint points on both sides as the base and the line length of the analysis model as two sides on the flat analysis surface including the base line As described above, the vertex setting means 121 for geometrically setting any of a plurality of nodes as vertices, and whether or not the nodes belonging to each of the geometric vertices are movable from the reference routing path As analysis paths of nodes for analysis, analysis path setting means 122 for setting a perpendicular to the reference line from each vertex, and a wire at the set position of the belonging node on each analysis path with the vertex as the limit of the movable range A maximum movable position determining means 123 for analyzing the maximum movable position according to whether or not the deformation of the wire harness can be allowed based on the shape characteristics, material characteristics and constraint conditions of the harness, and a reference line For multiple analysis surfaces rotated at a predetermined rotation angle in the center, the analyzed maximum movable positions of a plurality of nodes on each analysis surface are connected in order, and common vertexes with different rotation angles are connected. The movable range data creating unit 124 creates movable range data in a three-dimensional space that sequentially connects the maximum movable positions.

  For example, as shown in FIG. 10 (A) and FIG. 11, the routing path analyzing means 110 is circular with respect to the wire harness 109 to be routed by being completely restrained by restraints CL1 and CL2 in different directions. By considering a plurality of beam elements that maintain the linearity of the cross section as an elastic body joined at a node, the length and shape characteristics of the circular cross section of the wire harness 109, a node group at intervals of, for example, 5 mm along the center line Based on the above-mentioned equation (1), using the three-dimensional coordinate values of b1 to b10, the cross-sectional area of the beam element, the secondary moment of section, the material properties such as the density, the longitudinal elastic modulus, the transverse elastic modulus, and the restraint position / direction as analysis conditions Based on the routing path function, the constraint point a1 is analyzed by analyzing the torsional rotation amount in which the forces are balanced and the translational three-dimensional position around the center line for each node. To create a linear analytical model M1 that defines the stable reference routing path between a2. In this way, the routing route in the three-dimensional space is analyzed for the entire area of the wire harness 109.

  As shown in FIGS. 10 (A) and 10 (B), the vertex setting means 121 of the movable range analysis unit 120 uses the line length of the line-shaped analysis model M1 for the nodes b1 to b10 between the constraint points a1 and a2 on both sides. For example, the vertex position is calculated by assuming that L1 is about 110 mm that is longer by the amount of curvature than the distance of 100 mm of the reference line B1. That is, assuming that the length of the base and the sum of the lengths of the two sides on both sides of the vertex are known, the constraint points on both sides of the nodes b1 to b10 are assumed on the assumption that the triangle, that is, the vertex position can be defined. A linear reference line B1 between a1 and a2 is used as a base, and the vertex position of a triangle defined according to the line length L1 and the line segment length on both sides of any node on the line is set.

  As shown in FIG. 10C, the analysis path setting unit 122 analyzes the intersections h1 to h10 that are the legs of the perpendicular to the reference line B1 from each vertex position, and sets each perpendicular. For each reference plane, the movable position determining means 123 at a minute interval from the reference routing path (FIG. 10 (A)) to the geometric vertex in the vertical analysis path to which the nodes b1 to b10 belong. The maximum positions Mh <b> 1 to Mh <b> 10 that converge when sequentially moved are analyzed using the analysis software of the above-described equation (1) that constitutes the routing route analysis unit 110.

  That is, in the process of sequentially moving the analysis path to which the nodes b1 to b10 belong by a minute amount, as described above with reference to FIG. 13, the nodes on both sides of the common position belonging to the node b1 and the both sides of the node b2 The maximum position is analyzed in a range in which the displacements between the nodes,... On both sides of the node b10 are equal and the forces are balanced. Incidentally, the displacement vector {x} corresponding to the amount of movement cannot be equal due to the difference in stiffness vector [K] on both sides, or the displacement due to the change in the surrounding routing shape. If the vector {F} cannot be balanced, the relationship of Expression (1) is not established, that is, does not converge.

As for the node b1, the deformation curvature of the wire harness 109 is reduced in the process of moving to the geometric maximum position, and the maximum position Mh1 within a converging range is determined at a position lower than the vertex v1 indicated by the x mark. . For the nodes b2 to b8, the maximum positions Mh2 to Mh8 coincide with the vertices to which they belong, which are indicated by x marks. The node b9 is greatly deformed from the routing position on the analysis surface of the reverse rotation phase with respect to the reference line B1 due to the restraining direction at the restraint point a2, and reaches the vertex v9. However, the maximum position Mh9 slightly exceeding the reference line B1 is determined. As for the node b10, the deformation is further restricted by the restriction of the restriction point a2 at the closest position, and the maximum position Mh10 is determined on the analysis surface of the reverse rotation phase.
It should be noted that the setting to the analysis path to which the nodes b1 to b10 belong in the movable position determining means 123 is not converged by confirming whether or not it converges at the vertex position in the opposite direction to moving sequentially toward the vertex. In some cases, it may be possible to move from the apex to the reference line B1 on the analysis path.

  As shown in FIG. 10 (D), the movable range data creating means 124 displays the maximum movable positions Mh11 to Mh102 on the analysis surface shown in FIGS. For example, the maximum movable positions Mh12 to Mh102 connected in the order of the analysis plane rotated by 30 ° and the points of the maximum movable positions of the common vertices are connected in order, and the common is similarly rotated by a predetermined angle over a range of 360 °. The points of the maximum movable position of the vertices are connected in order, and movable range data connecting the points of the last Mh111 to Mh1011 and the first maximum movable position Mh11 to Mh102 is created (FIG. 10 is omitted).

  In response to the movable range data, the display control unit 112 graphically displays a three-dimensional mesh image indicating the maximum movable range in the three-dimensional virtual space on the screen 102a of the display unit 102. The display is performed by a known method including a state in which the reference line B1 is viewed in front in the three-dimensional virtual space on the screen 102a with respect to the three-dimensional coordinate system of the CAD for analyzing the routing shape of the movable range data. In accordance with an operation command from the outside, it is converted into image display data viewed from an arbitrary direction, and graphic display is performed. As a modification of the movable range data creation means, when the points for displaying the maximum movable position are not connected, the display control means 112 displays the maximum movable range as a point cloud or a plot image instead of a mesh image. indicate.

  The wire harness movable range prediction means described above will be described based on the flowchart shown in FIG. When the prediction of the movable range of the wire harness W is started, each node is positioned at the apex of a triangle having the base line between the constraint points as the base and the line segment length on both sides of the node as two sides. Next, a perpendicular line is set from the vertex to the reference line. Next, the outermost movable position where the movement of the node from the reference routing path is allowed on the analysis path with the vertex as a limit is analyzed by FEM analysis. Next, the outermost movable positions of the nodes are analyzed by FEM analysis for a plurality of analysis planes rotated at predetermined rotation angles around the reference line. Finally, the outermost movable position on each analysis plane is connected with a line in order, and the outermost movable position of common vertices with different rotation angles are connected in order to create movable range data in a three-dimensional space. The movable range image is displayed in virtual three dimensions.

Using the movable range surface A of the wire harness 109 displayed on the screen of the display unit 102 by the wire harness movable range predicting means (FIG. 12E), the wire harness movable path display unit 130 then uses the wire harness movable path display unit 130 to 109 movable paths are predicted and displayed in advance. The wire harness movable route display unit 130 includes an outermost point automatic display unit 130, an outermost point route analysis condition assigning unit 131, a route display unit 132, and a selection instruction unit 104.
A plurality of arbitrary outermost points Mp are created by the outermost point automatic display means 131 at an arbitrary position of the maximum movable position Mh1--n of the movable range plane A of the wire harness 109 displayed on the screen of the display unit 102. This is displayed (see FIG. 12F and FIG. 14).
A route analysis condition is assigned to each displayed outermost point Mp by the outermost point route analysis condition assigning means 131 (FIG. 12 (F)).

  Next, as shown in FIG. 13 and FIG. 14, any one of the outermost points Mpx displayed on the screen 102 a is selected by the selection instruction means (mouse) 104 of the wire harness movable path display unit 130 to perform path analysis. Give instructions. In FIG. 14, reference numeral 109a denotes an analysis source path of the wire harness including the outermost point Mpx that is selected and instructed to analyze the path.

Next, the finite element method analysis is performed according to the analysis condition given to the outermost point Mpx instructed to be selected by the selection instructing means 104, and the wire harness 109 including the outermost point Mpx as shown in FIG. The route Wa can be displayed on the screen 2a by the route display means 32.
JP 2004-119613 A JP 2005-149055 A

According to Conventional Example 4, in Conventional Example 1 to Conventional Example 3, the movable range of the wire harness can be predicted, but the route until the wire harness swings to any one outermost point where the problem actually occurs is shown. It became possible to solve the problem of being unable to show. Since the vibration path is unknown, it is difficult to predict the actual vibration path, and it is difficult to take measures in advance when the wire harness is actually disposed.
And it became possible to easily display the movable path of the swing of the automobile wire harness that could not be displayed by the prediction means.

  However, even in the conventional example 4, the physical characteristics of the wire harness set in performing the FEM analysis are limited, such as the type and diameter of the wire harness. The number of wires to be used, the type of protective material that protects the wires and bundles and covers the wires, and the strength of the protective material coating (the degree of freedom of each wire inside) are not considered. This causes an error in specifying the movable range, which is the range that can be taken by each part of the wire harness that occurs when actually attaching the cable, so that problems such as interference and excessive countermeasures are discovered at the stage of routing to the actual vehicle Has a point.

  In view of the above problems, the present invention enables the specification of the movable range by adding a condition for specifying the characteristics of the wire harness in addition to the specification of the movable range of the wire harness shown in the conventional example 4. In addition to this, a wire harness movable path analysis system that enables FEM analysis close to the actual routing is provided.

Therefore, in the present invention, in order to solve the above-described problem, the wire harness that is constrained and arranged at a distance by a restraining tool is divided into a plurality of node groups, and an elastic body is provided between each of the node groups. From the reference routing route, the wire harness is analyzed using the FEM analysis means based on the shape data of the wire harness, the material characteristics, and the condition data that is the constraint condition. The outermost point that can analyze and predict the movable range that can be forcibly moved and create and display multiple outermost points at any position of the maximum movable position of the displayed movable range of the wire harness An automatic display means, an outermost point path analysis condition assigning means for assigning a route analysis condition to the created outermost point, and a selection instruction means for selecting any one outermost point to be created A path display means for causing the FEM analysis means to perform analysis based on the analysis condition assigned to the outermost point selected by the selection instruction means, and to display the deflection route of the wire harness including the outermost point. In the system with
Condition data that can be changed for each component is stored in advance for each of a plurality of components constituting the wire harness, and the data can be read out by selecting by the input instruction means. A regression equation storage means that stores in advance as a regression equation a function equation that calculates the degree of contribution when each condition data is changed from the results obtained by experimenting the degree of contribution to deformation for each condition data;
It is possible to select the condition data that is each component stored in the regression equation storage means, and includes an input instruction means that can read out the selected condition from the storage means to the correction point calculation means,
Each condition data selected by the input instruction means is read and acquired from the regression equation storage means, and a regression equation stored in advance in the regression equation storage means is acquired from the regression equation storage means, and each condition data acquired in the regression equation And a correction point calculation means for calculating the outermost point correction value from the regression equation by applying
The outermost point analyzed by the FEM analyzing means is acquired, the outermost point correction value calculated by the correction point calculating means is acquired, and the outermost point corrected value is applied to the outermost point analyzed by the FEM analyzing means for correction. The outermost point is calculated, and the outermost point automatic display means displays the outermost point displayed by the outermost point automatic correction means.
Proposed is a wire harness movable route analysis system characterized in that the route display means can display the deflection route of the wire harness including the outermost point, with the corrected outermost point as the outermost point.

Moreover, the creation of the movable range surface of the wire harness in the movable path analysis system of the wire harness,
When analyzing and predicting the movable range in which the wire harness can be forcibly moved, with respect to the wire harness, on the plane analysis surface including the reference line, with the straight reference line between the restraint points on both sides as the base Arbitrary nodes are geometrically positioned at the vertices so as to form triangle vertices with the line length of the analysis model as two sides,
As a node analysis path for analyzing whether or not the nodes belonging to each vertex can move from the reference routing path, a perpendicular to the reference line is set from each vertex.
Whether the deformation of the wire harness corresponding to the shape characteristic, material characteristic and constraint condition of the wire harness can be allowed at the set position of the node belonging to each analysis path with the apex being the limit of the movable range, the above calculation is performed. Analyze the maximum movable position with the outermost point correction value,
Provided is a wire harness movable path analysis system for performing analysis of the maximum movable position for each of a plurality of analysis surfaces rotated at predetermined rotation angles around a reference line.

  Therefore, according to the present invention, it is possible not only to display the movable path of the automobile wire harness that could not be displayed by the conventional prediction means, but also to predict the movable path by an experiment in advance. Because it is possible to predict the movable path by taking into account the influence on the analysis data due to changes in the condition data such as material properties and restraint conditions of the wire harness in the movable path of the actual wire harness obtained, There is an effect that it is possible to predict a movable path close to an actually measured value.

  Therefore, wiring that prevents interference with peripheral parts due to runout of the wire harness due to traveling of an automobile, etc. becomes possible more than before, and it is possible to prevent disconnection of the wire harness, occurrence of abnormal noise, etc. Has an effect.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 4 are explanatory views of a wire harness movable range prediction method used in the wire harness movable path display system according to the embodiment of the present invention, and FIG. 6 is an explanatory diagram showing a state in which any one of the outermost points in FIG. 5 is selected and instructed by the selection instruction means, and FIG. 7 shows a state in which the path of the analysis result in FIG. 5 is displayed. FIG.

  The wire harness movable path display system according to the embodiment of the present invention is based on the wire harness movable range predicting means (FIG. 4E) described in the prior art 3. A movable range analysis system used for predicting the movable range of the wire harness will be described in detail with reference to FIG.

  The movable range analysis device is used to analyze the maximum movable range from the analyzed routing route, for example, for a wire harness that is intermittently constrained and routed to an automobile instrument panel or its surrounding body. A personal computer 1 is used, and a display unit 2, a keyboard 3 and a mouse 4 as input units, and an input / output unit 5 such as an input / output disk drive 6 in which a recording medium such as a CD is set are attached. The following units are configured by incorporating a CPU, a memory and the like and operating according to a program.

  In other words, the analysis condition storage means 11 for storing analysis conditions based on the material characteristics and shape characteristics of the wire harness, the constraint conditions such as the three-dimensional coordinate value and the constraint direction of the constraint part as condition data, and the constraint based on the analysis condition The routing route analyzing means 10 for analyzing the center line of the wire harness virtually as a line-shaped analysis model by FEM analysis of the stable reference routing route of the wire harness which is restrained at a distance from each other by the tool, and is input In response to the image display data, the display control means 12 for performing graphic display imitating a three-dimensional shape using the screen 2a of the display unit 2 as a three-dimensional virtual space, a movable range analyzing unit 20 for analyzing the movable range of the wire harness, The wire harness movable path display unit 30 is configured.

  In addition, as shown in FIGS. 2A and 3, for example, the routing route analyzing means 10 is routed when the wire harness W is completely restrained by the restraining tools CL1 and CL2 in different directions. On the other hand, the length / circular cross-sectional shape characteristics of the wire harness 9 and the center line thereof are considered by considering the plurality of beam elements having the linearity of the circular cross-section as elastic bodies connected at the nodes b1 to b10. For example, the analysis conditions include the three-dimensional coordinate values of the node groups b1 to b10 at intervals of 5 mm, the cross-sectional area of the beam element, the cross-sectional secondary moment, the density, the longitudinal elastic modulus, the transverse elastic modulus, and the like, and the constraint position / direction. Based on the routing path function according to the above equation (1), the calculation means capable of analyzing the torsional rotation amount in which the forces are balanced and the three-dimensional position resulting from the translation around the center line for each node. In addition, by calculating the calculation means, it is possible to create a line-shaped analysis model M1 that defines a stable reference routing path between the constraint points a1 and a2, and to store data of the generated analysis model M1 This can be stored by storing means. In this way, the routing route analyzing means 10 analyzes the routing route in the three-dimensional space for the entire area of the wire harness 9.

  The movable range analysis unit 20 includes calculation means that can calculate a straight line connecting between the constraint points on both sides as a reference line, and on the analysis surface that is a plane including the reference line with the reference line calculated by the calculation means as a base. In addition, a triangle having the base line as the base and the line length of the analysis model as the length of the other two sides is formed, the vertices of the other two sides of the triangle are formed, The movable range analysis unit 20 includes vertex setting means 21 that can geometrically set the nodes as vertices. The vertex setting means 21 has a computing means capable of calculating each node position and a storage unit capable of storing the computation result in association with a preset calculation formula. In the vertex setting means 21, since the wire harness has a sufficient length between the restraining tools on both sides, it becomes longer than the reference line, so that a triangle is formed with the vertex.

  Then, as shown in FIGS. 2A and 2B, the vertex setting means 21 determines that the line length L1 of the line-shaped analysis model M1 is, for example, the reference line for each of the nodes b1 to b10 between the constraint points a1 and a2 on both sides. The vertex position is calculated with respect to the distance B1 of 100 mm as about 110 mm which is longer by the amount of curvature. That is, assuming that the length of the base and the sum of the lengths of the two sides on both sides of the vertex are known, the constraint points on both sides of the nodes b1 to b10 are assumed on the assumption that the triangle, that is, the vertex position can be defined. A linear reference line B1 between a1 and a2 is used as a base, and the vertex position of a triangle defined according to the line length L1 and the line segment length on both sides of any node on the line is set.

  In addition, the movable range analysis unit 20 includes analysis path setting means 22. The analysis path setting means 22 reads the geometric vertex positions set and stored by the vertex setting means 21 from the vertex setting means 21 and analyzes whether or not the belonging node can move from the reference routing path. As a nodal analysis path for this purpose, the calculation means included in the analysis path setting means 22 calculates the perpendicular to the reference line from each vertex set by the vertex setting means 21 according to a predetermined calculation formula. Each perpendicular line is set by enabling the storage unit 22 to store.

Then, as shown in FIG. 2C, the analysis path setting unit 22 analyzes the intersections h1 to h10 that are the legs of the perpendicular to the reference line B1 from each vertex position, and sets each perpendicular.
For each reference plane, the movable position determination means 23 at a minute interval from the reference routing path (FIG. 2 (A)) to the geometric vertex in the vertical analysis path to which the nodes b1 to b10 belong. The maximum positions Mh <b> 1 to Mh <b> 10 that converge when sequentially moved are analyzed using the analysis software of the above-described equation (1) that constitutes the routing route analysis means 10.

  That is, in the process of sequentially moving the analysis path to which the nodes b1 to b10 belong by a minute amount, as described above with reference to FIG. 5, the nodes on both sides of the common position belonging to the node b1 and the both sides of the node b2 The maximum position is analyzed in a range in which the displacements between the nodes,... On both sides of the node b10 are equal and the forces are balanced. Incidentally, the displacement vector {x} corresponding to the amount of movement cannot be equal due to the difference in stiffness vector [K] on both sides, or the displacement due to the change in the surrounding routing shape. If the vector {F} cannot be balanced, the relationship of Expression (1) is not established, that is, does not converge.

  As for the node b1, the deformation curvature of the wire harness 9 is reduced in the process of moving to the geometric maximum position, and the maximum position Mh1 within a converging range is determined at a position below the vertex v1 indicated by the x mark. . For the nodes b2 to b8, the maximum positions Mh2 to Mh8 coincide with the vertices to which they belong, which are indicated by x marks. The node b9 is greatly deformed from the routing position on the analysis surface of the reverse rotation phase with respect to the reference line B1 due to the restraining direction at the restraint point a2, and reaches the vertex v9. However, the maximum position Mh9 slightly exceeding the reference line B1 is determined. As for the node b10, the deformation is further restricted by the restriction of the restriction point a2 at the closest position, and the maximum position Mh10 is determined on the analysis surface of the reverse rotation phase.

  Further, the movable range analyzing unit 20 includes a maximum movable position determining unit 23. The maximizing same position determining means 23 sets the vertex set by the vertex setting means 21 as the limit of the movable range, and sets the shape characteristic, material characteristic, and constraint condition of the wire harness at the set position of the belonging node on each analysis path. The maximum movable position can be analyzed based on whether or not the deformation of the wire harness can be allowed based on certain condition data, and the analysis result can be stored. Therefore, the maximum movable position determination means 23 includes a calculation means and a storage means.

  It should be noted that the setting to the analysis path to which the nodes b1 to b10 belong in the movable position determining means 23 confirms whether or not the nodes b1 to b10 are converged at the vertex position in the opposite direction to the sequential movement toward the vertex, and does not converge. In some cases, it may be possible to move from the apex to the reference line B1 on the analysis path.

Further, the movable range analysis unit 20 includes movable range data creating means 24.
The movable range data creation unit 24 includes a calculation unit and a storage unit, and a plurality of analysis planes rotated at a predetermined rotation angle around the reference line with respect to a plurality of nodes on each analysis plane. It is possible to create movable range data in a three-dimensional space in which the analyzed maximum movable positions are connected in order, and the maximum movable positions of common vertices having different rotation angles are connected in order. The maximum movable position of each node stored in is read, the calculation means performs FEM analysis, and the storage means sequentially stores the results. Then, the movable range data created by the movable range data creating means 24 is output to 71.

  As shown in FIG. 2D, the movable range data creating means 24 displays the maximum movable positions Mh11 to Mh102 on the analysis surface shown in FIGS. For example, the maximum movable positions Mh12 to Mh102 connected in the order of the analysis plane rotated by 30 ° and the points of the maximum movable positions of the common vertices are connected in order, and the common is similarly rotated by a predetermined angle over a range of 360 °. The maximum movable position point between the vertices is connected in order, and the movable range data connecting the last Mh111 to Mh1011 and the first maximum movable position Mh11 to Mh102 is created. In FIG. 2, the created data is omitted.

The movable range data analyzed by the movable range data creating unit 24 is output to the correction unit 7.
The correcting unit 7 includes a movable range correcting unit 7a capable of correcting the movable range data and a movable path correcting unit 7b capable of correcting the movable path. The movable range data input from the movable range data creating unit 24 is: It is corrected by the movable range correction unit 7a.

  That is, the actual measurement obtained in advance by moving the nodes b1 to b10 of the wire harness W actually restrained by the restraining tools CL1 and CL2 to the movable range data created by the movable range data creating means 24. In order to correct the movable range data obtained by FEM analysis using the regression formula obtained from the movable range so as to approach the measured value, the movable range regression formula storage unit 71, the movable range calculation unit 72, the movable range correction unit 73, and condition input The movable range data of the wire harness W obtained by the movable range data creation means 24 is corrected by the condition data by the movable range correction means 7a provided in the correction unit 7 comprising the means 74.

  That is, the movable range regression equation storage means 71 can store various information on a hard disk (not shown) of the computer system. The information stored in the movable range regression equation storage means 71 is condition data that is a physical component of the wire harness W for FEM analysis of the movable range data. Specifically, it is necessary for FEM analysis of the movable range. The wire diameter information a of the single wire constituting the wire harness W, the wire type information b representing the type of the wire constituting the wire harness W, and the occupation ratio that is the proportion of the wire in the cross section of the wire harness W c, diameter information d when the wire harness W is cut at right angles to the length direction, protective material type information e indicating the type of protective material that covers and bundles the wires constituting the wire harness W, and wire This is the number f of electric wires constituting the harness W. Further, the movable range regression equation storage means 71 stores a regression equation h for correction. The regression equation h is read by the movable range recalculation unit 72 and calculated by substituting the stored condition data selected by the condition input unit 74 into the regression equation h.

  The regression equation h stored in the movable range regression equation storage means 71 can calculate the degree to which each condition data contributes to the FEM analysis in order to specify the movable range data, that is, the correction value based on the condition data in the FEM analysis. Yes, while changing the condition data using the actual wire harness W in advance, the nodes b1 to b10 of the wire harness W restrained by the restraint tool CL1 and the restraint tool CL2 are moved to the outermost point, and the measured data is obtained. In the same way as before, the difference from the movable range data analyzed by FEM when there is no correction by the condition data is compared for each condition data, and the degree to which each condition data contributes to the movable range data is measured. It is obtained by calculating an approximate expression in which a coefficient is given to the contribution degree of each condition data. Since the regression equation h varies depending on the positions of the nodes b1 to b10, the regression equation h is prepared for each of the nodes b1 to b10, and is calculated and stored for each of the nodes b1 to b10. If there is a correlation between the nodes b1 to b10 and the positions of the nodes from the constraint tool CL1 or the constraint tool CL2, the positions of the nodes b1 to b10 are set in advance as part of the condition data. As a result, one regression equation h is sufficient. In this embodiment, a regression equation as shown in FIG. 8 is used as the regression equation h, but other regression equations may be used, and a correction value for obtaining movable range data close to the actually measured movable range data is calculated. Any expression is possible if possible.

Each condition data is displayed in a list at a predetermined position of the display unit 2 by the display control unit 12 and is selectively input by the condition input unit 74 (also used as the input / output unit 5). Then, the value selected by the operator using the condition input means 74 is read from the movable range regression equation storage means 71 and output to the movable range calculation means 72, and the movable range calculation means 72 is also read from the movable range regression expression storage means 71. The value is substituted into the regression equation and the calculation is performed.
For example, in the wire diameter information a, the diameter of the input single wire, for example, a diameter such as 1.25 mm may be directly input from the keyboard 3 of the condition input means 74, and the value may be used in this embodiment. The display control means 12 displays a list on the display unit 2 so that the wire diameter information a can be selected, and by clicking the mouse 3 of the condition input means 74, a value can be selected from the table. Therefore, the values to be displayed in the list are stored in advance in the movable range regression equation storage means 71, and the condition input means 74 causes the display control means 12 to display and select the values, and the values are displayed in the movable range regression equation storage means. 71 is read from 71, and is calculated to be substituted into the regression equation by the movable range calculating means 72.
Further, the wire type information b is a value representing the physical properties such as stiffness of the electric wire, which is an element wire constituting the wire harness W, depending on the thickness, the outer covering, etc. The information of various strands to be stored in advance is stored in the movable range regression equation storage means 71 and, like the length information a, can be substituted into the regression equation h by being displayed and selected on the display unit 2. The line type information b may be read from a list printed by the operator and directly input by the keyboard 3 of the condition input means 74. In this case, the input value is temporarily returned to the movable range regression. What is necessary is just to make it memorize | store in the formula memory | storage means 71 grade | etc., And to substitute to the regression equation h when the movable range calculating means 72 calculates.
Similarly, the number of wires f is also preliminarily stored in the movable range regression equation storage means 71 from “1” to “30”, for example, and displayed on the display unit 2 to select a desired number, The value is read from the movable range regression equation storage unit 71 and substituted when the movable range calculation unit 72 performs the calculation. The wire number information f may be directly input by the condition input means 74. In this case, the number is input and the number is temporarily calculated as it is in the storage means such as the movable range regression equation storage means 71. What is necessary is just to be memorize | stored and used as the electric wire number information f used at the time.
The occupancy rate c is the same, and the occupancy rate, which is the proportion of the electric wire in the cross section of the wire harness W assumed in advance, is determined, and the occupancy rate of the wire harness W assumed in the movable range regression equation storage means 71 Is stored numerically. Then, it is displayed and selected on the display unit 2 in the same manner as described above, and is read out as the occupied ratio c and used for the calculation of the regression equation h. This occupation ratio c may also be used by directly inputting the value.
The diameter information d is also the same, the diameter of the wire harness W assumed in advance is stored in the movable range regression equation storage means 71, and the display control means 12 displays the stored diameter on the display unit 2, The diameter selected and input by the condition input means 74 is read from the movable range regression equation storage means 71 and output to the movable range calculation means 72. For the diameter information d, a numerical value is directly input from the keyboard 3, and the value is temporarily stored in a storage unit such as the movable range regression equation storage unit 71, and is read and used during the calculation of the movable range regression equation storage unit 71. In this embodiment, it is formed so that it can be directly input.
The same applies to the protective material type information e. Since the movement of the wire harness W is restricted by the type of the protective material, it is information for specifying the type of the protective material covering the wire harness W assumed in advance and is movable. The contribution degree corresponding to the type of the protective material assumed in the range regression equation storage means 71 is numerically stored in various ways. Then, the display control unit 12 displays the stored type on the display unit 2, the selection is input by the condition input unit 74, and a numerical value representing the degree of contribution stored corresponding to the type of the selected protective material Is read from the movable range regression equation storage means 71 and output to the movable range calculation means 72.

In this embodiment, the length information a between the restraining tool CL1 and the restraining tool CL2 of the wire harness W, the line type information b representing the type of electric wire constituting the wire harness W, the restraining tool CL1, and the restraining tool CL2 are configured. The clamp type information c, the diameter information d of the wire harness W, the protective material type information e indicating the type of the protective material of the wire harness W, and the number of electric wires information f constituting the wire harness W are the nodes b1 of the wire harness W, respectively. Thru | or the factor which contributes to the movable range data of the position of b10, and it was used as condition data, but other regression formulas, such as reducing the thing with a low contribution degree among these, or adding the conditions which contribute to others etc. You may make it calculate using the approximate expression used as h.
In this embodiment, the condition input means 74 is formed by the input / output unit 5. That is, the input / output unit 5 also functions as the condition input unit 74. The condition data other than the clamp type information c and the protective material type information e are input and used as real values from the keyboard 3 of the input / output unit 5 and are temporarily stored in a storage unit such as the regression equation storage unit 71. The clamp type information c and the protective material type information e are selected by the mouse 4 provided in the input / output unit 5 in the display unit 2 so as to be output to the movable range calculation unit 72 during the calculation of the movable range calculation unit 72. A numerical value representing the constraint contribution stored in the regression equation storage unit 71 corresponding to the one selected from the display is read out and output to the movable range calculation unit 72 when the movable range calculation unit 72 calculates. To form.

  In this embodiment, the condition data related to the protective material type information e indicating the type of the protective material of the wire harness W is stored in the protective material data storage means 75 provided separately and stored in the movable range regression equation storage means 71. The other condition data a to condition data d and condition data f are stored separately, and when the value of the protective material type information e displayed on the display unit 2 is selected by the mouse 4 of the input / output unit 5 The corresponding protective material type information e is configured to be output to the movable range calculation means 72 via the movable range regression equation storage means 71, but may be stored in the movable range regression expression storage means 71. In addition, the movable range regression equation storage unit 71 and the protective material data storage unit 75 are provided separately from the analysis condition storage unit 11, but substantially the analysis condition storage unit 11 and the movable range regression equation storage as the entire computer system. The means 71 and the protective material data storage means 75 function as a hard disk drive, and each data is stored in advance in the hard disk drive.

  Reference numeral 8 denotes a regression equation accuracy selection unit. Since the calculation based on the regression equation h differs depending on the accuracy of the correction value to be calculated, the regression equation accuracy selection unit 8 is a value displayed by the display control unit 12 so as to be selectable by the input / output unit 5 so as to have the required accuracy. The selected value is output to the movable range calculating means 72. The regression equation accuracy selection unit 8 can be selected from the values displayed by the display control means 12 so as to be selectable by the input / output unit 5 similarly from the condition data a to the condition data f used by substituting into the regression equation h. It is possible to cause the movable range calculating means 72 to calculate the regression equation h using only the selected value and not using other condition data. By providing the regression equation accuracy selection unit 8 in this way, calculation can be performed without using condition data having a low contribution degree as a condition for bringing it closer to an actual measurement value among the condition data, so that the analysis time can be shortened. It becomes. Specifically, the diameter information d that is substantially the diameter of the protective material, the wire information b that represents the wire type, and the like have little influence on accuracy, and therefore are not selected by the regression equation accuracy selection unit 8 and are used in the regression equation h. For example, the movable range calculating means 72 calculates without using the terms using.

The movable range correction unit 7 a configured as described above stores the regression formula in the movable range calculation unit 72 when the input of the condition data from the movable range regression type storage unit 71 and the protective material data storage unit 75 by the input / output unit 5 is completed. The regression equation h stored in the means 71 is read out, the condition data is substituted into the regression equation h, and a movable range correction value for correcting the movable range data is calculated.
As described above, the regression equation h for calculating the movable range correction value differs depending on the nodes b1 to b10. The regression equation h for the node b1 is the regression equation with the highest correction accuracy as illustrated in FIG. 8A. Uses all the condition data a through condition data f, and the coefficients Ka through Kf represent coefficients representing the contributions of the condition data a through condition data f, respectively. In the example shown in FIG. 8A, the accuracy of the movable range correction value has a matching rate of 95% with measured data. In addition, the example shown in FIG. 8B represents a regression equation h when only the condition data a and the condition data e are used in order to speed up the arithmetic processing, and the coefficient and the condition data are relatively contributed. Only the length information a and the protective material type information e having a large degree are used. In the example using the regression equation h shown in FIG. 8B, the accuracy of the correction value has a matching rate with the measured data of about 70%. Then, when the match rate of 90% is selected as the threshold, as shown in FIG. 8C, the regression equation h using the condition data a, the condition data e, and the condition data f is obtained. In this case, the correction value The accuracy is 90%, which is the desired match rate with the measured data.

73 is a movable range correction means. The movable range correcting unit 73 is connected so as to be able to acquire the calculation result from the movable range data creating unit 24 and is connected so as to be able to acquire the calculation result from the movable range calculating unit 72, and the movable range acquired from the movable range data creating unit 24. Using the data and the movable range correction value acquired from the movable range calculating means 72, the movable range data calculated by the movable range data creating means 24 can be corrected and output to the outermost point automatic display means 31 as new movable range data. It is.
Accordingly, the movable range correcting means 73 corrects the movable range data analyzed by the conventional movable range data creating means 24 so as to approach the actual wire harness attached, and provides corrected new movable range data.

In response to the movable range data created by the movable range data creating unit 24, the display control unit 12 displays a three-dimensional mesh image indicating the maximum movable range on the screen 2a of the display unit 2 in the three-dimensional virtual space. Display as a graphic. The display includes a state in which the reference line B1 is viewed in front in the three-dimensional virtual space on the screen 2a with respect to the three-dimensional coordinate system of the CAD for analyzing the movable range of the movable range data by a known method, In accordance with an operation command from the outside, it is converted into image display data viewed from an arbitrary direction, and graphic display is performed. As a modification of the movable range data creating means, when the points for displaying the maximum movable position are not connected, the display control means 12 displays the maximum movable range as a point cloud or a plot image instead of a mesh image. indicate.
In other words, the display control means 12 can convert the input information into information that can be displayed on the display unit 2 and display it on the screen 2a. For example, when information on a wire harness swing path Wa output from the path display means 33 is input, the information can be displayed on the screen of the current display unit 2 and displayed. It is also possible to control whether to display the image or display it alone. This control is performed by inputting an instruction signal from the operator. Note that frame data generation and video signal output by the display control means 12 are not different from the usual video graphics technology, and thus detailed description thereof is omitted.

The operation of each means of the wire harness movable range prediction means described above will be described based on the flowchart shown in FIG. When the prediction of the movable range of the wire harness W is started, the vertex setting means 21 positions each node at a vertex of a triangle having the reference line between the constraint points as the base and the line segment length on both sides of the node as two sides. Next, the analysis path setting means 22 sets a perpendicular from the apex to the reference line. When the setting of the perpendicular line is completed, the movable position determining means 23 then analyzes the outermost movable position where the movement of the node from the reference routing path is allowed on the analysis path by the FEM analysis with the apex as a limit. Then, based on the outermost movable position determined by the movable position determining means 23, the outermost movable positions of the nodes on the plurality of analysis planes rotated by the movable range data creating means 24 about the reference line at every predetermined rotation angle. Are each analyzed by FEM analysis.
In addition, the movable range data creating means 24 connects the outermost movable positions on the respective analysis planes with lines in order, and connects the outermost movable positions of the common vertices with different rotation angles in order in the three-dimensional space. Movable range data is created, and the movable range data specified by the movable range data creating means 24 is output to the movable range correction unit 7a, and further corrected by the movable range correction unit 7a to be closer to the actual measurement value. The display control means 12 displays this as a movable range image on the display unit 2 as a virtual three-dimensional image. Further, new movable range data output from the movable range correction unit 7 a is output to the wire harness movable path display unit 30.

  Next, as shown in FIG. 4F, the wire harness movable path display unit 30 predicts and displays the movable path of the wire harness W in advance. That is, the wire harness movable path display unit 30 is movable by using the data of the movable range surface A of the wire harness W displayed on the screen 2a of the display unit 2 by the wire harness movable range prediction unit shown in FIG. Predict and display the route. The wire harness movable path display unit 30 includes an outermost point automatic display means 30, an outermost point path analysis condition giving means 31, a path display means 32, and a selection instruction means 4.

The outermost point automatic display means 31 creates an arbitrary plurality of outermost points Mp at arbitrary positions of the maximum movable position Mh1--n of the movable range surface A of the wire harness W displayed on the screen 2a of the display unit 2. Computable computing means, and storage means capable of storing the computed results. Then, the stored outermost point Mp can be output to the display control means 12, and the data of the outermost point Mp can also be output to the outermost point path analysis condition assigning means 32.
And the display control means 12 which inputted the data of the outermost point Mp produces the display image which displays the outermost point Mp shown in FIG.4 (F) and FIG. 6, and displays the wire harness W on the screen 2a of the display part 2. FIG. Display with

As shown in FIG. 4F, the outermost point path analysis condition assigning means 32 acquires the data of the outermost point Mp calculated by the outermost point automatic display means 31, and outputs the outermost point Mp to the outermost point Mp. Path analysis conditions necessary for analyzing the path of the outer point can be assigned, and calculation means that can analyze the path of the outermost point Mp by FEM analysis based on the assigned analysis condition is stored, and the analyzed data is stored. Possible storage means.
That is, in the outermost point path analysis condition assigning means 32, as shown in FIGS. 5 and 6, the operator designates one arbitrary outermost point Mpx displayed on the screen 2 a by the selection instruction means (mouse) 4. When the selection is made, the position is recognized (details are omitted because it is a function normally provided by a computer), a route analysis instruction is issued, condition data stored in advance in the analysis condition storage means 11 is read, FEM analysis is performed on the outermost point Mpx, and the path of the outermost point Mp is analyzed.
Then, the outermost point path analysis condition assigning means 32 outputs data relating to the analyzed path of the outermost point Mp to the outermost point correcting means 78.
In this embodiment, the selection instruction means 4 is the mouse 4 of the personal computer 1, and the act of selecting and instructing is a click of the mouse 4. As another embodiment of the selection instruction means 4, any member that can perform the same action as a mouse such as a keyboard of a personal computer or a touch panel is possible. In that case, the act of selecting and instructing is touching the keyboard or touch panel. In FIG. 6, 9a shows the analysis origin path | route of the wire harness containing the outermost point Mpx selected and instruct | indicated path | route analysis.

  In the FEM analysis performed by the outermost point path analysis condition assigning means 32, the outermost point Mp created by the outermost point automatic display means 31 is a wire harness that is actually restricted by the restraining tools CL1 and CL2, which is a feature of the present invention. Regression equation storage means 76 for correcting the outermost point path FEM-analyzed using the regression equation obtained in advance from the outermost point position obtained by moving each of the nodes b1 to b10 of W so as to approach the measured value; When the outermost point path analysis condition applying unit 32 performs FEM analysis by the correction unit 7 including the outer point calculation unit 77, the outermost point correction unit 78, and the condition input unit 79, the correction based on the condition data of the wire harness W is performed. ing. The regression equation storage unit 76, the outermost point calculation unit 77, the outermost point correction unit 78, and the condition input unit 79 form a path correction unit 7 b of the correction unit 7.

  That is, the regression equation storage means 76 can store various information on a hard disk (not shown) of the computer system. The information stored in the regression equation storage means 76 is condition data that is a physical component of the wire harness W for FEM analysis of the outermost point path, and specifically, is necessary for FEM analysis of the movable range. The wire diameter information a of the single wire constituting the wire harness W, the line type information b representing the type of the wire constituting the wire harness W, and the occupation ratio c that is the ratio of the wire in the cross section of the wire harness W Diameter information d when the wire harness W is cut at right angles to the length direction, protective material type information e indicating the type of protective material that covers and bundles the wires constituting the wire harness W, and the wire harness It is the number information f of electric wires constituting W. Further, the regression equation storage means 76 stores a regression equation h for correction. The regression equation h is read by the outermost point calculation means 77 and is calculated by substituting the stored condition data selected by the condition input means 79 into the regression equation h.

  The regression equation h stored in the regression equation storage means 76 depends on the degree to which each condition data contributes to the analysis when the FEM analysis is performed by the outermost point path analysis condition assigning means 32, that is, the condition data in the FEM analysis. A correction value can be calculated, and the nodes b1 to b10 of the wire harness W restrained by the restraint tool CL1 and the restraint tool CL2 are changed to the outermost points while changing the condition data in advance using the actual wire harness W. Compared with the outermost point path analyzed by FEM when there is no correction by the condition data as before, the measured data is moved and compared for each condition data, which condition data is in the outermost point path The degree of contribution is measured, and an approximate expression in which a coefficient is given to the degree of contribution of each condition data is calculated. Since the regression equation h varies depending on the positions of the nodes b1 to b10, the regression equation h is prepared for each of the nodes b1 to b10, and is calculated and stored for each of the nodes b1 to b10. If there is a correlation between the nodes b1 to b10 and the positions of the nodes from the constraint tool CL1 or the constraint tool CL2, the positions of the nodes b1 to b10 are set in advance as part of the condition data. As a result, one regression equation h is sufficient. In this embodiment, a regression equation as shown in FIG. 8 is used as the regression equation h. However, other regression equations may be used, and an analysis outermost point route close to the actually measured outermost point route can be calculated. Any expression may be used.

  Each condition data is displayed in a list at a predetermined position on the display unit 2 by the display control means 12 and is selectively input by the condition input means 79. Then, the value selected by the operator using the condition input means 79 is read from the regression equation storage means 76 and output to the outermost point calculation means 77, and the outermost point calculation means 77 is also read from the regression expression storage means 76. It is formed so that an operation is performed by substituting the value into an expression. For example, in the wire diameter information a, the diameter of the input single wire, for example, a diameter such as 1.25 mm may be directly input from the keyboard 3 of the condition input means 79, and the value may be used. The display control means 12 causes the display unit 2 to display a list so that the wire diameter information a can be selected, and by clicking the mouse 3 of the condition input means 79, a value can be selected from the table. Therefore, the values to be displayed in the list are stored in advance in the regression equation storage unit 76, and the condition input unit 79 displays the values on the display control unit 12 to select them, and the values are read from the regression equation storage unit 76. The outermost point calculation means 77 is formed so as to be substituted into the regression equation.

  Further, the wire type information b is a value representing the physical properties such as stiffness of the electric wire, which is an element wire constituting the wire harness W, depending on the thickness, the outer covering, etc. The information of various strands to be stored in advance is stored in the regression equation storage means 76, and can be substituted into the regression equation h by being displayed and selected on the display unit 2 like the length information a. The line type information b may be read from a list printed by the operator and directly input by the keyboard 3 of the condition input means 79. In this case, the input value is temporarily stored in the regression equation. It may be stored in the means 76 or the like and substituted into the regression equation h when the outermost point calculating means 77 calculates.

  Similarly, the number of wires f is also preliminarily stored in the regression equation storage means 76 from “1” to “30”, for example, and is displayed on the display unit 2 in the same manner as described above to select the desired number. At the time of calculation by the point calculation means 77, the value is read from the regression equation storage means 76 and substituted. The number of wires f may be directly input by the condition input unit 79. In this case, the number is input and the number is temporarily used as it is in the storage unit such as the regression equation storage unit 76 during calculation. What is necessary is just to be memorize | stored and used as the electric wire number information f to do.

  The occupancy rate c is the same, and the occupancy rate, which is the proportion of the electric wire in the cross section of the wire harness W assumed in advance, is determined, and the occupancy rate of the wire harness W assumed in the movable range regression equation storage means 71 Is stored numerically. Then, it is displayed and selected on the display unit 2 in the same manner as described above, and is read out and used as the selected occupation ratio c for calculation of the regression equation h. This occupation ratio c may also be used by directly inputting the value.

  The diameter information d is the same, and the diameter of the wire harness W assumed in advance is stored in the regression equation storage means 76, and the display control means 12 displays the stored diameter on the display unit 2 for condition input. The selected diameter is selected and input by the means 79, and the selected diameter is read from the regression equation storage means 76 and output to the outermost point calculation means 77. For the diameter information d, a numerical value is directly input from the keyboard 3, the value is temporarily stored in a storage means such as the regression equation storage means 76, and is read out and used in the calculation of the regression expression storage means 76. In this embodiment, it is formed so that it can be directly input.

  The same applies to the protective material type information e. Since the movement of the wire harness W is restricted by the type of the protective material, it is information for specifying the type of the protective material covering the wire harness W that is assumed in advance. The degree of contribution corresponding to the type of protective material assumed in the expression storage means 76 is numerically stored. Then, the display control unit 12 displays the stored type on the display unit 2, the selection is input by the condition input unit 79, and the numerical value indicating the contribution degree stored in correspondence with the selected type of the protective material Is read from the regression equation storage means 76 and output to the outermost point calculation means 77.

  In this embodiment, the length information a between the restraining tool CL1 and the restraining tool CL2 of the wire harness W, the line type information b representing the type of electric wire constituting the wire harness W, the restraining tool CL1, and the restraining tool CL2 are configured. The clamp type information c, the diameter information d of the wire harness W, the protective material type information e indicating the type of the protective material of the wire harness W, and the number of electric wires information f constituting the wire harness W are the nodes b1 of the wire harness W, respectively. To b10, which is a factor contributing to the outermost point path and used as the condition data. Of these, other regressions such as reducing the low contribution or adding a condition contributing to the other are used. You may make it calculate using the approximate expression used as Formula h.

  In this embodiment, the condition input means 79 is formed by the input / output unit 5. That is, the input / output unit 5 also functions as the condition input unit 79. The condition data other than the clamp type information c and the protective material type information e are input and used as real values from the keyboard 3 provided in the input / output unit 5 and are temporarily stored in a storage unit such as the regression equation storage unit 76. The clamp type information c and the protective material type information e are formed so as to be output to the outermost point calculation means 77 at the time of calculation by the outermost point calculation means 77. The numerical value representing the constraint contribution stored in the regression equation storage unit 76 corresponding to the one selected from the selected values is read out, and the outermost point calculation unit 77 calculates the outermost point calculation unit 77 during calculation. 77 to output to 77.

  Further, in this embodiment, the condition data regarding the protective material type information e indicating the type of the protective material of the wire harness W is stored in the protective material data storage means 75 provided separately, and is stored in the regression equation storage means 76. The other condition data a to condition data d and condition data f are stored separately, and correspond when the value of the protective material type information e displayed on the display unit 2 is selected by the mouse 4 of the input / output unit 5. The protective material type information e is configured to be output to the outermost point calculation means 77 via the regression equation storage means 76, but may be stored in the regression expression storage means 76. Further, although the regression equation storage unit 76 and the protective material data storage unit 75 are provided separately from the analysis condition storage unit 11, the analysis condition storage unit 11 and the regression equation storage unit 76 are substantially protected as the entire computer system. The material data storage means 75 is a hard disk drive that functions as a storage means, and each data is stored in advance in the hard disk drive.

  Reference numeral 8 denotes a regression equation accuracy selection unit. Since the calculation based on the regression equation h differs depending on the accuracy of the correction value to be calculated, the regression equation accuracy selection unit 8 is a value displayed by the display control unit 12 so as to be selectable by the input / output unit 5 so as to have the required accuracy. The selected value is output to the outermost point calculation means 77. The regression equation accuracy selection unit 8 can be selected from the values displayed by the display control means 12 so as to be selectable by the input / output unit 5 similarly from the condition data a to the condition data f used by substituting into the regression equation h. It is possible to cause the outermost point calculation means 77 to calculate the regression equation h using only the selected value and not using other condition data. By providing the regression equation accuracy selection unit 8 in this way, calculation can be performed without using condition data having a low contribution degree as a condition for bringing it closer to an actual measurement value among the condition data, so that the analysis time can be shortened. It becomes. Specifically, the diameter information d that is substantially the diameter of the protective material, the wire information b that represents the wire type, and the like have little influence on accuracy, and therefore are not selected by the regression equation accuracy selection unit 8 and are used in the regression equation h. For example, the outermost point calculation means 77 performs the calculation without the terms using the.

The correction unit 7 configured as described above stores in the regression equation storage unit 76 when the outermost point calculation unit 77 completes the input of the condition data from the regression equation storage unit 76 and the protective material data storage unit 75 by the input / output unit 5. The stored regression equation h is read out, the condition data is substituted into the regression equation h, and the outermost point correction value for correcting the outermost point path is calculated.
As described above, the regression equation h for calculating the outermost point correction value differs depending on the nodes b1 to b10. The regression equation h of the node b1 is the regression having the highest correction accuracy as illustrated in FIG. 8A. The equation uses all the condition data a to condition data f, and the coefficients Ka to Kf represent the coefficients representing the contributions of the condition data a to the condition data f, respectively. In the example shown in FIG. 8A, the accuracy of the correction value is 95% in agreement with the measured data. In addition, the example shown in FIG. 8B represents a regression equation h when only the condition data a and the condition data e are used in order to speed up the arithmetic processing, and the coefficient and the condition data are relatively contributed. Only the length information a and the protective material type information e having a large degree are used. In the example using the regression equation h shown in FIG. 8B, the accuracy of the correction value has a matching rate with the measured data of about 70%. Then, when the match rate of 90% is selected as the threshold, as shown in FIG. 8C, the regression equation h using the condition data a, the condition data e, and the condition data f is obtained. In this case, the correction value The accuracy is 90%, which is the desired match rate with the measured data.

  In this embodiment, the outermost point calculation means 77 only calculates the outermost point correction value, but acquires the data of the outermost point Mp calculated by the outermost point automatic display means 31 and obtains the outermost point correction value. A path analysis condition necessary for analyzing the path of the outermost point can be assigned to the outer point Mp, and the path of the outermost point Mp is provided with a function of FEM analysis based on the assigned analysis condition. The means may be combined with the outer point path analysis condition assigning means 32, and it is sufficient if the system includes means having the functions of the outermost point path analysis condition giving means 32 and the outermost point calculation means 77.

  Reference numeral 78 denotes outermost point correction means. The outermost point correction means 78 is connected so as to be able to acquire the calculation result from the outermost point path analysis condition assigning means 32 and is connected so as to be able to acquire the calculation result from the outermost point calculation means 77, and the outermost point path analysis condition. The wire harness deflection path Wa is corrected using the wire harness deflection path Wa acquired from the applying means 32 and the outermost point correction value acquired from the outermost point calculation means 77, and the newly corrected wire harness The shake path Wa can be calculated and output to the path display means 33.

Accordingly, the outermost point correction means 78 corrects and corrects the new wire harness runout to correct the wire harness runout path Wa analyzed by the conventional outermost point path analysis condition assigning means 32 when the wire harness is actually attached. The route Wa is provided.
The route display means 33 inputs the wire harness deflection path Wa corrected by the outermost point correction means 78, generates the wire harness deflection path Wa as CAD data based on the analyzed result, and displays the display unit 2 Is output to the display control means 12 as information that can be displayed. As a result, the swing path Wa of the wire harness is finally displayed on the display unit 2 by the display control means 12.

  In the above embodiment, for the sake of explanation, the correction unit 7 is formed of the movable range correction unit 7a and the path correction unit 7b, and each has the same calculation or storage function. The correction unit 7a may have a function of the path correction unit 7b, and the same means may have a function of the movable range correction unit 7a and the path correction unit 7b. Such a configuration is sufficient.

  The present invention can be used for the design of wire harnesses used in automobiles, home appliances, etc., and verification of work processes of these products.

The block diagram explaining the structure of the movable range analyzer which implements the wire harness movable range prediction method used for the wire harness movable path | route display system which is embodiment of this invention Explanatory drawing explaining operation | movement of the movable range analyzer of FIG. The front view which shows the wire harness used as the analysis object of the movable range analyzer of FIG. The flowchart explaining operation | movement of the movable range analyzer of FIG. The flowchart of the wire harness path | route display part used for the wire harness movable path | route display system which is embodiment of this invention Explanatory drawing showing the state of clicking one of the displayed outermost points with the mouse Explanatory drawing which similarly shows the state which displayed the wire harness deflection | deviation path | route of the analysis result of FIG. It is explanatory drawing showing the regression equation which calculates an outermost point correction value, (a) is an example of the regression equation with the highest correction accuracy but requires work time, (b) is the lowest correction accuracy but the most work time. An example of a regression equation that becomes shorter, (c) is an example of a regression equation in which the correction accuracy and working time are in a good state The block diagram explaining the structure of the movable range analyzer which implements the wire harness movable range prediction method used for the conventional wire harness movable path | route display system Explanatory drawing explaining operation | movement of the movable range analyzer of FIG. 9 which is a prior art example figure. Front view showing a wire harness to be analyzed by the movable range analyzer of FIG. 9 is a flowchart for explaining the operation of the movable range analyzing apparatus of FIG. Flow chart of wire harness path display unit used in conventional wire harness movable path display system Explanatory drawing which shows the state which clicks one of the conventional displayed outermost points with a mouse. Explanatory drawing which similarly shows the state which displayed the wire harness deflection | deviation path | route of the analysis result of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 PC 2 Display part 3 Keyboard 4 Mouse 5 Input / output part 6 Disk drive 7 Correction | amendment part 7a Movable range correction | amendment part 71 Movable range regression type memory | storage means 72 Movable range calculation means 73 Movable range correction means 74 Condition input means (input / output part 5) )
75 Protection material data storage unit 7b Movable path correction unit 76 Regression equation storage unit 77 Outermost point calculation unit 78 Outermost point correction unit 79 Condition input unit (input / output unit 5)
DESCRIPTION OF SYMBOLS 10 Arrangement route analysis means 11 Analysis condition storage means 12 Display control means 20 Movable range analysis part 21 Apex setting means 22 Analysis path setting means 23 Movable position determination means 24 Movable range data creation means 30 Wire harness path display part 31 Outermost point Automatic display means 32 Outermost point path analysis condition assigning means 33 Route display means
a1, a2 restraint point B1 reference line b1-b10 node CL1, CL2 restraint tool h1-h10 intersection L1 line length M1 analysis model
Mh1 to Mh10 Maximum movable position A Wire harness movable prediction range Mp1 to Mpn Outermost point of wire harness movable predicted range Mpx One arbitrary outermost point selected and instructed W Wire harness Wa Wire harness analysis source path a Length information b Line type information c Clamp type information d Diameter information e Protective material type information f Number of wires information

Claims (3)

A wire harness that is constrained at a distance from each other by a restraining tool and divided into a plurality of node groups, and a line analysis that assumes that a beam element as an elastic body is interposed between each node group Movable range is analyzed by analyzing the range in which the wire harness can be forcibly moved from the standard routing route analyzed by the FEM analysis means based on the condition data that is the shape characteristics, material characteristics and constraint conditions of the wire harness. In the wire harness movable range prediction system that can predict and display the movable range surface,
Condition data that can be changed for each component is stored in advance for each of a plurality of components constituting the wire harness, and the data can be read out by selecting by the input instruction means. A regression equation storage means that stores in advance as a regression equation a function equation that calculates the degree of contribution when each condition data is changed from the results obtained by experimenting the degree of contribution to deformation for each condition data;
It is possible to select the condition data that is each component stored in the regression equation storage means, and includes an input instruction means that can read out the selected condition from the storage means to the correction point calculation means,
Each condition data selected by the input instruction means is read and acquired from the regression equation storage means, and a regression equation stored in advance in the regression equation storage means is acquired from the regression equation storage means, and each condition data acquired in the regression equation And a correction point calculation means for calculating the outermost point correction value from the regression equation by applying
The outermost point analyzed by the FEM analyzing means is acquired, the outermost point correction value calculated by the correction point calculating means is acquired, and the outermost point corrected value is applied to the outermost point analyzed by the FEM analyzing means for correction. The outermost point is calculated, and the outermost point automatic display means displays the outermost point displayed by the outermost point automatic correction means.
The wire harness movable range prediction system, characterized in that the route display means can display the deflection route of the wire harness including the outermost point with the corrected outermost point as the outermost point. A wire harness that is constrained at a distance from each other by a restraining tool and divided into a plurality of node groups, and a line analysis that assumes that a beam element as an elastic body is interposed between each node group Analyze and predict the movable range in which the wire harness can be forcibly moved from the standard routing route analyzed by the FEM analysis means based on the shape data of the wire harness, the material properties and the constraint data. It is equipped with an outermost point automatic display means that creates and displays a plurality of outermost points at arbitrary positions of the maximum movable position on the movable range surface of the displayed wire harness. Provided with outermost point path analysis condition assigning means for assigning path analysis conditions, with selection instruction means for selecting any one outermost point to be created, and attached to the outermost point selected by the selection instruction means. Is to perform the analysis in the FEM analysis means on the basis of the analysis conditions are, in a system comprising a route display means for displaying a path of deflection of the wire harness including the outermost point,
Condition data that can be changed for each component is stored in advance for each of a plurality of components constituting the wire harness, and the data can be read out by selecting by the input instruction means. A regression equation storage means that stores in advance as a regression equation a function equation that calculates the degree of contribution when each condition data is changed from the results obtained by experimenting the degree of contribution to deformation for each condition data;
It is possible to select the condition data that is each component stored in the regression equation storage means, and includes an input instruction means that can read out the selected condition from the storage means to the correction point calculation means,
Each condition data selected by the input instruction means is read and acquired from the regression equation storage means, and a regression equation stored in advance in the regression equation storage means is acquired from the regression equation storage means, and each condition data acquired in the regression equation And a correction point calculation means for calculating the outermost point correction value from the regression equation by applying
The outermost point analyzed by the FEM analyzing means is acquired, the outermost point correction value calculated by the correction point calculating means is acquired, and the outermost point corrected value is applied to the outermost point analyzed by the FEM analyzing means for correction. The outermost point is calculated, and the outermost point automatic display means displays the outermost point displayed by the outermost point automatic correction means.
A wire harness movable route analysis system, characterized in that the route display means can display the deflection route of the wire harness including the outermost point with the corrected outermost point as the outermost point. When analyzing and predicting the movable range in which the wire harness can be forcibly moved, with respect to the wire harness, on the plane analysis surface including the reference line, with the straight reference line between the restraint points on both sides as the base Arbitrary nodes are geometrically positioned at the vertices so as to form triangle vertices with the line length of the analysis model as two sides,
As a node analysis path for analyzing whether or not the nodes belonging to each vertex can move from the reference routing path, a perpendicular to the reference line is set from each vertex.
Whether the deformation of the wire harness corresponding to the shape characteristic, material characteristic and constraint condition of the wire harness can be allowed at the set position of the node belonging to each analysis path with the apex being the limit of the movable range, the above calculation is performed. Analyze the maximum movable position with the outermost point correction value,
The movable range surface of the wire harness is created according to claim 1 or 2, wherein the analysis of the maximum movable position is performed for each of a plurality of analysis surfaces rotated at predetermined rotation angles around a reference line. Wire harness movable path analysis system.

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