JP4542007B2 - Wire harness routing shape analyzer - Google Patents

Description

  The present invention relates to the physical properties of a wire harness by a finite element method for an analysis model composed of nodes on the center line of a wire harness routed by being restrained at a distance from each other by a restraint. Analyzing the torsional rotation amount and three-dimensional position around the center line for each node using the data, shape data and constraint conditions as analysis conditions, create a deformation analysis model corresponding to torsional deformation between the constraint positions. The present invention relates to a wiring harness analyzing apparatus for displaying a wiring shape in a three-dimensional virtual space displayed on a screen of a display unit by a cylinder corresponding to the outer diameter of the wire harness in response to a model.

  According to Patent Document 1, the applicant of the present invention specifies a wire harness constrained at a predetermined site by assuming that the wire harness is an elastic body in which a plurality of beam elements having a circular cross section are combined by the finite element method. Coordinate value recognizing means for recognizing a moving position where a part is instructed on the screen and moved on the screen as a three-dimensional coordinate value of the three-dimensional coordinate system for analysis, and physical property data, shape data, and constraint conditions of the wire harness As an input condition, in response to the recognized three-dimensional coordinate value data of the final and intermediate movement positions, an analysis model consisting of nodes on the central line of the wire harness as the specific part moves by the finite element method The deformation analysis model is sequentially created by analyzing the deformation of the wire, and in response to the deformation analysis model, the wire position in which the final and intermediate movement positions are deformed is displayed in the three-dimensional virtual space on the screen. The three-dimensional shape of Ness proposed a deformation analysis apparatus of the wire harness graphically displaying the cylindrical imitating.

In other words, the routing route when moving a specific part of the wire harness can be confirmed on the screen by analyzing and displaying the torsional rotation amount and the three-dimensional position around the center line for each node by the finite element method. Therefore, interference with peripheral parts of the wire harness or interference with peripheral parts due to variations in the mounting state can be evaluated with high accuracy, and the dependence on the prototype can be reduced or eliminated when designing the wiring harness. it can.
JP 2005-22574 A

  On the other hand, when wiring such a wire harness, when restraining the restraint position with a restraint such as a connector or a clamp, if the rotational position of the attachment does not correspond to the torsional deformation of the wire harness, the wire after the routing There is a problem that an excessive torsional load is applied to the harness or that the restraint must be reattached. That is, it is preferable to appropriately adjust the rotational position of the attachment of the restraint tool when the restraint direction is changed even if the next restraint position is on the same plane as the previous routing surface.

In view of the above, the present invention provides a wiring harness arrangement that enables a wire harness to be twisted and deformed on the screen from the immediately preceding restraint position to the next restraint position during the wiring harness routing operation. It aims at providing a cable shape analysis apparatus .

In order to achieve the above-mentioned object, the present invention focuses on the fact that the amount of twisted rotation of the wire harness becomes an analysis element when analyzing the wiring shape of the wire harness by the finite element method. For a cylindrical wire harness that is routed by being restrained at a distance from each other with a tool, analyze the routing shape between the restrained positions and display it in the three-dimensional virtual space on the screen of the display unit In the routing shape analyzer, for the analysis model composed of the nodes on the center line of the wire harness, the center line for each node is analyzed using the physical property data, shape data and constraint conditions of the wire harness as the analysis conditions by the finite element method. A deformation analysis means for analyzing a twist rotation amount and a three-dimensional position centered on the surface to create a deformation analysis model for defining a cabling shape between restraint positions; It sets the reference point on the surface of the cylindrical portion surrounding the nodes in the vicinity of the restrained position on the surface of the cylindrical portion surrounding each a predetermined number of nodes for the next restrained position from a reference point corresponding to each of the torsion rotation amount Between the predetermined number of nodes, torsion point data creation means for obtaining the rotation position of the torsion points in order, torsion line data creation means for creating torsion line data passing through the associated torsion points along the longitudinal direction of each cylindrical portion, and a predetermined number of nodes Cylinder data creating means for creating a cylinder data defining a unit cylinder having a vertical width corresponding to the interval of the wire and the outer diameter of the wire harness, and a unit cylinder on a straight line connecting in order between a predetermined number of nodes of the deformation analysis model data di to the central axis of a cylindrical analysis model data creating means for creating a cylindrical deformation analysis model data by positioning a cylindrical column in this order, a cylindrical deformation analysis model data, the cylindrical column And model data converting means for converting the projected cylindrical image data defining a projected cylindrical image projected to the projection plane corresponding to the screen of the playing unit, three-dimensional between restraining position in response to the projected cylindrical image data on a screen And a display control means for displaying a twisted line on the surface of the cylindrical row in response to the twisted line data belonging to each cylindrical portion .

As a result, assuming that the twist rotation amount of each node constituting the analysis model of the central line of the wire harness is analyzed in the routing shape analysis process, this twist rotation amount is converted into the three-dimensional shape of the wire harness peripheral surface. Is displayed at the corresponding rotational position on the surface of each cylindrical portion of the cylindrical row corresponding to, and the state in which the wire harness is gradually twisted toward the next restrained position is displayed as an image of the amount of rotation of the cylinder. . The cylindrical row is created by sequentially positioning the central axis of the unit cylinder on a straight line that sequentially connects a predetermined number of nodes of the deformation analysis model data.

In this case, in order to facilitate the confirmation of the torsion line, according to claim 2, in the torsion line data creation means, the reference point is set to the outermost position of the cylindrical portion surrounding the node near the restraint position in the three-dimensional virtual space. At the same time, the display control means distinguishes and displays the twist lines on the front side and the back side of the cylindrical row.

According to the first aspect of the present invention, the twisted state when the wire harness is routed from the immediately preceding restraint position to the next restraint position and restrained can be confirmed on the screen, and therefore the wire harness is attached at the same rotational position. The torsional load on the wire harness when restrained by the restrained tool can be evaluated. In other words, it is possible to perform a comfortable routing operation by adjusting the mounting rotation position of the restraint tool while checking the twisted state on the screen . When displaying the wiring shape on the two-dimensional screen in the form of a three-dimensional cylindrical shape according to the analysis result of the wiring shape based on the analysis model of the center line of the wire harness by the finite element method By converting the cylindrical deformation analysis model data by a series of cylindrical parts , i.e., cylindrical rows , into projection data, it becomes unnecessary to perform arithmetic processing using a large number of functions for curves at the graphic processing stage, Memory capacity is greatly reduced. In that case, according to the invention of claim 2, the twisted state can be surely confirmed over the entire area.

  A routing shape analyzing apparatus according to an embodiment of the present invention will be described with reference to FIGS. This apparatus uses a personal computer 1 to carry out the wiring harness routing shape analysis method of the present invention, and further includes a display unit 2, a keyboard 3 and mouse 4 as input units, and a recording medium such as a CD. An input / output unit 5 such as an input / output disk drive 6 is attached.

  The personal computer 1 functions to include the following means by operating a built-in memory, CPU and the like by a program for analyzing the wiring shape of the wire harness (W / H) read by the disk drive 6. That is, the CAD data storage means 19 for storing the CAD data directly taken in through the disk drive 6 or from the CAD device, the CAD data necessary for analyzing the routing shape by the finite element method, and especially the physical properties are inputted. An analysis condition setting means 12 that takes in and sets an analysis condition input by an operation, and a center line of a wire harness that is routed by being constrained by a restraint in order based on the analysis condition For the analysis model composed of the nodes along the line, the amount of twist rotation about the center line and the 3D position of the CAD 3D coordinate system are analyzed for each node, and the allocation between the constraint positions is analyzed. Deformation analysis means 13 for creating a deformation analysis model for defining the shape of the rope, and surrounding a node near the restraint position with respect to a cylinder corresponding to the outer diameter of the wire harness Set a reference point on the surface of the cylindrical part on the radial position, and twist the rotation position from the reference point corresponding to the amount of torsional rotation on the surface of the cylindrical part surrounding each node group toward the next constraint position. On the screen 2 a of the display unit 2, the torsion point data creating means 14 for obtaining the points in order, the torsion line data creating means 15 for creating the torsion line data passing through the associated torsion points along the longitudinal direction of each cylindrical portion, In response to the analyzed W / H deformation analysis model and torsion line data stored in the display data storage unit 10a together with the data necessary for graphic processing on the three-dimensional virtual space displayed according to the CAD coordinate system. And a display control means 10 for graphically displaying a cylinder simulating a three-dimensional routing shape and graphically displaying a twist line on the surface of the cylinder.

  The CAD data storage unit 19 includes a three-dimensional model of the W / H routing shape to be analyzed designed by the CAD device, the coordinate value on the CAD coordinate system of each constraint position, the shape data of each constraint tool, It is stored as CAD data together with the respective restraining directions and W / H property data.

  W / H is a plurality of bundled electric wires, a resin sheathed cable having a plurality of core wires, a plurality of bundled cables, etc. Therefore, the bending rigidity is remarkably smaller than the longitudinal and transverse rigidity, and the length direction Since the expansion and contraction of the beam is limited, it can be regarded as an elastic body in which a plurality of beam elements are equivalently coupled, and this coupling point can be used as a node of the analysis model. That is, the positions of adjacent nodes are sequentially analyzed based on the analyzed torsion amount of each node, and a deformation analysis model is created by connecting each node in turn with a straight line. Accordingly, the deformation analysis means 13 uses the W / H outer diameter / length shape, restraint position / direction, Young's modulus / Poisson ratio / density in the CAD data set by the analysis condition setting means 12 as analysis condition data. A deformation analysis model corresponding to torsional deformation between restraint positions is created by the finite element method. Physical property data not considered by the CAD device is separately input and set on the personal computer 1 side. For example, as shown in FIG. 2, a deformation analysis model M1 is created for the final area of W / H arranged on the back side of the instrument panel of a car, and the twist line data creation process described below is performed. Then, as shown in FIG. 3, the W / H routing shape is displayed by the cylinder 20.

That is, as shown in FIG. 2, the mounting hole is restrained vertically upward by the clamp 21 at the immediately preceding restraining position, and the connector 22 at the tip is twisted from the vertical direction to the connector seat 23 at the next restraining position in the horizontal direction. When the plugged, deformed position defining a wiring shape for nodes b of a predetermined distance between the nodes a ₀ and node a ₁ belongs to the restraining position of the next final belonging to the final restraining position immediately before (x _b1, y _b1 , z _b1 ), (x _b2 , y _b2 , z _b2 )... (x _bn−1 , y _bn−1 , z _bn−1 ), (x _bn , y _bn , z _bn ) are analyzed, A deformation analysis model M1 is created. At that time, as shown in the figure, the twisted point data creating means 14 has a node a ₀ on the circular shape with a radius corresponding to W / H centered on this point, that is, the outermost position of the surface of the associated cylindrical portion. The reference point _Pa0 is set at (the position swelled most on the monitor side). In the following, the twist points P _b1 , P _b2 ... P _n− on the surface of the associated cylindrical portion according to the torsional rotation amount obtained on the circle surrounding each node b in order toward the next constraint position a _{1. 1, P bn,} three-dimensional coordinate values of _{P a1} is calculated.

  The torsion line data creation unit 15 creates torsion line data Lt that passes through the torsion points linearly along the longitudinal direction of the surface of the associated cylindrical portion having a vertical width corresponding to the interval between adjacent nodes. Is done. As a result, the display control means 10 takes the deformation analysis model M1 and the torsion line data Lt into the display data storage unit 10a, and performs curved graphic processing based on the W / H outer diameter data and the shape data of the restraint. The cylinder 20 is displayed together with the restraint tool, and the torsion line data Lt is displayed on the surface of the cylinder 20 by graphic processing according to the straight line or curve of the cylinder 20. indicate. At this time, the twist line 29 can be displayed as a straight line in a cylindrical portion unit corresponding to the node group without performing a curve process.

  The operation of the thus configured W / H routing shape analyzer will be described. In the personal computer 1, the CAD data of the desired stored three-dimensional model of the W / H routing shape is selected by the input operation of the keyboard 3 or the mouse 4 and the routing shape is analyzed. Further, as shown in FIG. 3, when an instruction to display the final range is given in the three-dimensional virtual space corresponding to the CAD coordinate system of the XYZ axes by the input operation, the connector 22 attached to the clamp 21 and the connector seat 23 and A cylinder 20 corresponding to the twisted and deformed W / H arrangement shape is displayed, and a twist line 29 is displayed as a continuous line on the surface. As a result, the W / H restrained vertically upward by the clamp 21 is identical to the connector seat 23 at the next restraining position by the connector 22 based on the twist line 29 hidden on the back surface so as to display a dotted line from the outermost position. When restrained in the horizontal W / H direction at a position off the surface, the torsional deformation during the display with the dotted line is confirmed.

As a result, an intersection position 29a between the ellipse E of the W / H terminal area and the twisted line 29 that is a dotted line is assumed on the screen 2a, and the torsional rotation with respect to the base point 29b of the nearby twisted line 29 corresponding to the reference point _Pa0. The quantity is confirmed along with its direction of rotation. Therefore, if the mounting position of the connector 22 at the distal end of the W / H in the natural state with the clamp 21 as a base point is shifted by about 90 ° in advance in the direction of the distal end of the W / H, the connector seat 23 can be used. It is understood that you are restrained by. Similarly, when confirming the mounting position of the clamp 21, the screen 2a is scrolled with the mouse 4 to display the routing range shown in FIG. In this case, it is restrained in the horizontal direction by the clamp 25 at the immediately preceding restraint position, and torsional deformation when restraining vertically upward by the clamp 21 at the next restraint position with this restraint position as a base point is confirmed by the twist line 29. . Thus, it can be seen that the attachment position of the clamp 21 may be rotated clockwise by an appropriate rotation angle with respect to the attachment position of the clamp 25 when viewed from the tip direction of W / H.

As described above, the torsional deformation between the restraint positions can be confirmed on the screen 2a, so that when the wire harness is routed by the restraint tool in order from the base end to the last connector 22, The twisting load applied to the wire harness is eliminated by adjusting the rotational position of the restraint tool while checking the amount of torsional rotation of the restraint tool at the next restraint position relative to the restraint position in order from the base end side. Or it becomes possible to reduce and route.

As an improvement plan for reducing the memory capacity required for the graphic display processing of the cylindrical wire harness when checking the twist deformation in such a wire harness, the personal computer 1 shown in FIG. Each part is programmed to be added. That is, for the nodes of the standard deformation analysis model data before analysis, cylinder data defining a unit cylinder having a vertical width corresponding to a predetermined number of intervals between nodes and an outer diameter corresponding to the outer diameter of W / H is created. Cylindrical data generation means 31 and a cylindrical deformation analysis model data defining a series of cylindrical portions , ie, cylindrical rows, in which the central axis of the unit cylinder is sequentially positioned on a straight line connecting between a predetermined number of nodes subjected to deformation analysis. a cylindrical model data creating unit 32, model data for converting the cylindrical deformation analysis model data, the projection cylindrical image data defining a projected cylindrical image projected to the projection plane cylindrical columns corresponding to the two-dimensional screen 2a Conversion means 33 is added.

That is, as shown in FIG. 6A, the cylindrical data creating means 31 has W / H outer diameter data set by the longitudinal width and analysis condition setting means 12 corresponding to, for example, a distance of 2 mm between two adjacent nodes b. The cylinder data defining the unit cylinder Me having a vertical width of 2 mm and having the outer diameter is created. As shown in FIG. 6B for the three adjacent nodes, the cylindrical model data creation means 32 positions the central axis of the unit cylinder Me in order on a straight line connecting the two nodes displaced according to the analysis result. Create model deformation analysis model data. In response to the cylindrical deformation analysis model data, the torsion line data creation unit 15 generates torsion line data Lt that passes through the torsion points linearly along the longitudinal direction of the surface of the cylindrical row , as shown in FIG. 6B. create.

The model data conversion unit 33 responds to the projection direction designated by the input operation at the input / output unit 5 corresponding to the routing shape, and displays the projection plane defined by any two of the three axes on the screen 2a. Assuming that, the cylindrical row by the unit cylinder Me is projected together with the restraint tool, and converted into projected cylindrical image data defining each contour position. For example, in FIG. 3 described above, the YZ-axis plane is set as the projection plane along the X-axis, or the projection direction onto the YZ-axis plane is indicated from 45 ° obliquely moved in the X-axis direction.

  In response to the projection cylindrical image data, the display control means 10 creates image data for displaying the cylindrical row corresponding to the routing shape together with the outer shape of the restraint tool, and stores it in the attached display data storage unit 10a. An image is displayed in the three-dimensional virtual space displayed in 2a, and a linear twist line c along the vertical direction is displayed on the surface of each cylindrical portion in response to the twist line data Lt. At that time, based on the display control data for graphic display stored in the storage unit, the surface of each unit cylinder Me is colored, and its orthogonal end faces are displayed separately by changing the brightness, etc. When the end face positions of the unit cylinders Me coincide, the end face image is omitted and continuously displayed, and a shadow with respect to parallel light from the projection direction is displayed by a change in luminance. The twist line is colored with a color different from that of the unit cylinder Me. Of course, the straight line area may be divided and displayed in units of the unit cylinder Me, and each cylindrical surface may be displayed with a contour without being colored, or the coloring may be displayed not only in color but also in gray scale. It is done.

  In the personal computer 1, when the projection direction to the YZ axis plane is instructed from the above-mentioned 45 ° obliquely upward direction with respect to the analysis result of the routing range shown in FIG. 4 by the input operation, as shown in FIG. A projection image 20a of a series of cylindrical portions (longitudinal width is enlarged for simplicity) corresponding to the torsionally deformed W / H1 arrangement shape between 25 is displayed, and on the surface of each cylindrical image, A twist line 29c along a straight line connecting the nodes is displayed.

  In the above-described embodiment, the vertical width of the unit cylinder Me is set corresponding to the interval between two adjacent nodes, but the vertical width is set to correspond to three or more node intervals, It may be possible to create twist line data corresponding to the amount of twist rotation of the node and perform graphic processing more easily.

It is a figure explaining the circuit structure of the apparatus which enforces the wiring shape analysis method of the wire harness by embodiment of this invention. It is a figure explaining the analysis principle of the apparatus. It is a figure explaining the screen display state of the wiring shape of the last area | region of the wire harness by the same apparatus. It is a figure explaining the screen display state of the wiring shape of the wire harness of the area | region immediately before the last area | region by the same apparatus. It is a figure explaining the circuit structure as an improvement plan for displaying the cylindrical wire harness in the apparatus graphically . It is a figure explaining the operation principle of the circuit structure by FIG. It is a figure which simplifies a cylindrical row | line and demonstrates the screen display state of the wiring shape of the wire harness by the circuit structure of FIG.

1 personal computer 2 display unit 2a screen 3 keyboard 4 mouse 20 cylindrical 21 and 25 clamp 22 connector 23 connector seat 29,29c twisting lines a ₀ corresponding to the wire harness, _a 1, b node Lt twist line data M1 deformation analysis model Me Unit cylinder

Claims (2)

Wire harness that is arranged in a three-dimensional virtual space on the screen of the display unit by analyzing the wiring shape between the restrained positions of a cylindrical wire harness that is routed by being restrained at a distance from each other by a restraint In the routing shape analyzer of
For an analysis model consisting of a group of nodes on the center line of the wire harness, the twist about the center line for each node using the physical property data, shape data and constraint conditions of the wire harness as analysis conditions by the finite element method A deformation analysis means for creating a deformation analysis model for defining the routing shape between the constraint positions by analyzing the rotation amount and the three-dimensional position, and setting a reference point on the surface of the cylindrical portion surrounding the node near the constraint position And twist point data creating means for sequentially obtaining, as twist points, rotational positions from the reference points corresponding to the respective torsional rotation amounts on the surfaces of the cylindrical portions respectively surrounding the predetermined number of nodes toward the next restraint position. Twist line data creating means for creating twist line data passing through the twist points belonging along the longitudinal direction of each cylindrical portion; and the predetermined number of the nodes Connecting the cylinder data producing means for producing cylindrical data defining unit cylinder having an outer diameter of the vertical width and the wire harness corresponding to the spacing between, between the nodes of said predetermined number of said deformation analysis model data in order Cylindrical analysis model data creation means for creating cylindrical deformation analysis model data by a cylindrical row in which the central axis of the unit cylinder is positioned on a straight line in order, the cylindrical deformation analysis model data, and the cylindrical row of the display unit Model data conversion means for converting the projection cylindrical image projected onto the projection plane corresponding to the screen into projection cylindrical image data, and a three-dimensional space between the constraint positions on the screen in response to the projection cylindrical image data. The routing shape is displayed by the cylindrical row, and a twisted line is formed on the surface of the cylindrical row in response to the twist line data belonging to each cylindrical portion. Wiring shape analysis apparatus of the wire harness characterized by comprising a display control means for displaying. In the twist line data creation means, the reference point is set at the outermost position of the cylindrical portion surrounding the node near the restraint position in the three-dimensional virtual space, and the display control means distinguishes the twist line on the front side and the back side of the cylindrical row. The wire harness routing shape analysis apparatus according to claim 1, wherein the wiring harness routing shape analysis apparatus displays the wiring harness.

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