JP5400638B2 - Wiring design method, wiring simulation apparatus and program - Google Patents

Description

The present invention relates to a wiring design method for simulating a wire harness manufacturing process by a computer . In particular, the present invention relates to a wiring design method and the like that can simulate a manufacturing process in which electric wires are wired one by one and packed.

  The wire harness is bundled together with related parts for the purpose of compactly mounting an electric wire mounted on a vehicle or the like. Since the wire harness has a relatively flexible property, it is manufactured on a plane called a manufacturing board (also referred to as an ASSY board or a jig board). When the wire harness manufactured in this way is mounted on a vehicle or the like, there are cases where escape or twisting more than expected occurs and the product does not function as a product. Therefore, trial production was indispensable in designing the wire harness. However, since only a prototype method requires time and cost, a simulation apparatus for analyzing and designing a wire harness has been proposed.

  Patent Document 1 discloses a deformation analysis apparatus that analyzes a deformation of an entire wire harness to be analyzed by a finite element method and can be confirmed on a screen when a specific portion between the restraint points of the wire harness is moved. ing. In the deformation analysis apparatus of Patent Document 1, the finite element method is used in response to the three-dimensional coordinate value data of the specific part and the movement position specified on the screen using the physical property data, shape data, and constraint conditions of the wire harness as constraint conditions. The deformation analysis model is created by analyzing the deformation of the analysis model in the initial state as the specific part moves.

  Patent Document 2 discloses a harness design device that can automatically design an optimal bundling position with less load on a wire harness. The harness design device disclosed in Patent Document 2 includes a condition setting unit that acquires a binding position on the wire harness, or a constraint condition that the wire harness itself should satisfy, and a binding position condition indicated by the acquisition unit. A bundling position acquisition unit configured to change a bundling position and obtain a position where the mechanical energy of the entire wire harness is minimized as a bundling position; As a result, it is possible to obtain an optimum binding position with a small load on the wire harness.

Japanese Patent No. 4266783 JP 2009-134369 A

By the way, in the manufacture of a wire harness, electric wires are arranged one by one in a plurality of jigs embedded in a production board, and a plurality of electric wires are bundled and packed with a tape or the like. Therefore, in order to accurately simulate the manufacturing process of the wire harness, it is necessary to simulate from the initial shape of each electric wire wired on the manufacturing board.
However, in the finite element method adopted in Patent Document 1, it is necessary to specify the shape of the initial state as a constraint condition, so it is suitable as a solution for the problem of simulating the shape of the initial state of each electric wire laid on the production board is not.

In addition, in the related art including Patent Document 2, various analyzes are performed using a bundle (hereinafter referred to as “sub-harness”) in which a plurality of electric wires are bundled as a minimum unit. Therefore, it is impossible to simulate the state before being bundled as a sub-harness, that is, the state where the wires are wired one by one. Specifically, it is impossible to analyze the influence of the selection of the electric wires to be bundled as the sub-harness, the order in which the electric wires are bundled as the sub-harness, and the like.
Also, in the prior art, all the wires included in the same sub-harness are expressed as the same wire length and the same rigidity, so express variations in the wire length and layout of each wire that occur in the actual product. I can't.
In addition, in the analysis based on the prior art using the sub-harness as the smallest unit, the sub-harness shape, position, etc. are simulated so as to satisfy the product dimensions, so the dimensions of the branch points and the like must be accurately represented in reality. Cannot be verified to meet the tolerances of product dimensions.

  As described above, in the prior art, it is not possible to accurately simulate the manufacturing process of the wire harness until the electric wires are wired one by one and packed.

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a wiring design method and the like that can accurately simulate a wire harness manufacturing process by a computer .

The first invention to achieve the above object, the computer, a wiring designing method of performing wiring design of the wire harness, the control unit of the computer, is embedded in the input produced Release Osamu ingredients of the shape information, the arrangement information of the jig, physical property information of the wires forming the wire harness, and the analytical model to the route information constraints of the wire, the connections defined between every jig smooth interval functions Table with a first simulated process energy applied to each wire in a jig within the plane of the jig to simulate the wiring work of the electric wire by obtaining the shape function of the wire through the points with the smallest, the control unit Is a wiring design method characterized by including an output step of controlling the output of a simulation result in the first simulation step .

The jig shape information is the shape of a plane (= jig plane) that supports the electric wire. For example, when the jig is constituted by a support column embedded in the production board and a U-shaped support part disposed at the upper end of the support column, the jig plane is an area inside the U-shaped support part. .
The jig arrangement information includes the jig arrangement position, the normal direction of the jig plane, and the like.
The physical property information of the electric wire includes a diameter, a rigidity value, a wire length and the like of the electric wire.
The wire route information includes the positions (fixed positions) of connectors and clips connected to the wires, the order of jigs through which the wires should pass, and the like. In addition, the wire route information includes a group of wires bundled as a sub-harness, an order of bundles as a sub-harness, and the like.

According to the first invention, it is possible to simulate the state in which the electric wires are wired one by one, and to accurately simulate the manufacturing process of the wire harness.
In the first simulation process according to the first aspect of the present invention, a passing point passing through the jig plane of each jig is determined by a computer so that energy is minimized with respect to each electric wire, and passes through the arrangement point. Since the curve is interpolated, it is possible to accurately simulate the wiring operation of the electric wire at a processing speed that can withstand use at the manufacturing site. That is, since the jig plane of each jig is a two-dimensional space, the calculation time of the optimization problem can be shortened. In addition, since the result of considering the energy on the jig plane of each jig is reflected between the jigs, the shape considering the energy can be calculated for the entire wire path.

In the first invention, the control unit calculates the centers of a plurality of electric wires to be packed in the same jig plane of each jig based on the simulation result in the first simulation step, and A second simulation step of simulating the packing operation of the electric wire by applying a predetermined pressure from the center toward the center, and the output step includes a simulation result obtained by the control unit in the second simulation step. It is desirable to control the output of .
As a result, the wire packing operation can be accurately simulated. In particular, the cross-sectional shape and arrangement position of the sub-harness can be expressed in accordance with the actual product in each jig, and it is possible to verify whether or not the tolerances of the product dimensions are satisfied at the branch points.

Moreover, it is desirable that the analysis model in the first simulation step is such that the opposing jigs of each electric wire are connected by a spring element, and the electric wires are connected by a spring element in the jig plane.
By using an analysis model in which the jigs of each electric wire are connected by a spring element and the electric wires are connected by a spring element in the jig plane, a realistic result can be obtained while simplifying the model.

The energy in the first simulation step is preferably the sum of bending energy, tension energy, and gravity energy.
This makes it possible to accurately simulate a path with less load when the electric wires are wired.

In the first simulation step, the control unit calculates a line length for each electric wire based on the shape function of the electric wire, and in the output step, the control unit calculates the layout and the line length for each electric wire . It is desirable to control the display .
Thereby, the wire length of the electric wire can be tuned. Further, the cause of the variation in the layout of the electric wires can be specified.

Further, for example, in the first invention, before Symbol modeled first step, the control section, of the wire so that the sum of the line lengths of all the lines within the allowable range of the input energy is minimized fabric You may make it simulate line work.
As a result, the cost can be suppressed as long as it functions as a product.

2nd invention is a wiring simulation apparatus for simulating the manufacturing process of a wire harness, Comprising: The shape information of the jig | tool embed | buried in a manufacturing board, the arrangement | positioning information of a jig | tool, The physical property of the electric wire which comprises a wire harness information, and an acquisition unit for acquiring path information of the wire, in the analysis model to information obtained constraints by the acquisition unit, and display the connection defined between every jig smooth interval functions, each Osamu A first simulation means for simulating the wiring work of the electric wire by obtaining a shape function of the electric wire passing through a point where the energy applied to each electric wire is minimum in the jig plane of the jig, and a simulation by the first simulation means And an output means for outputting a result.
According to the second invention, it is possible to simulate the state in which the electric wires are wired one by one and accurately simulate the manufacturing process of the wire harness.

A third invention is a program for causing a computer to function as the wiring simulation device of the second invention.
By installing the program of the third invention in a computer, the wiring simulation device of the second invention can be obtained, simulating the state of wiring one by one, and the manufacturing process of the wire harness It can be simulated accurately.

According to the present invention, it is possible to provide a wiring design method and the like that can accurately simulate the manufacturing process of a wire harness by a computer .

Hardware configuration diagram of the wiring simulation device 1 Diagram showing the outline of the wiring design process Diagram explaining jig shape information Diagram explaining jig placement information Diagram explaining the physical property information and route information of electric wires Flow chart showing the flow of processing for simulating the wiring work of electric wires The figure explaining the handling between the jigs of the electric wire The figure explaining the handling of the electric wires in the jig plane The figure explaining the position coordinates of an electric wire Diagram explaining the coordinate system for defining the weight of the wire Flow chart showing the flow of processing for simulating wire packing work The figure explaining the process which simulates the packing work of an electric wire The figure which shows an example of the simulation result of the wiring work AA sectional view of FIG. A figure showing an example of simulation result of packing work AA sectional view of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a hardware configuration diagram of the wiring simulation apparatus 1. Note that the hardware configuration in FIG. 1 is an example, and various configurations can be adopted depending on applications and purposes.

  In the wiring simulation device 1, a control unit 11, a storage unit 12, a media input / output unit 13, a communication control unit 14, an input unit 15, a display unit 16, a peripheral device I / F unit 17, etc. are connected via a bus 18. Is done.

  The control unit 11 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like.

The CPU calls and executes a program stored in the storage unit 12, ROM, recording medium, or the like to a work memory area on the RAM, drives and controls each device connected via the bus 18, and the wiring simulation device 1. The process to be described later is realized.
The ROM is a non-volatile memory and permanently holds a computer boot program, a program such as BIOS, data, and the like.
The RAM is a volatile memory, and temporarily stores programs, data, and the like loaded from the storage unit 12, ROM, recording medium, and the like, and includes a work area used by the control unit 11 for performing various processes.

The storage unit 12 is an HDD (hard disk drive), and stores a program executed by the control unit 11, data necessary for program execution, an OS (operating system), and the like. With respect to the program, a control program corresponding to an OS (operating system) and an application program for causing a computer to execute processing described later are stored.
Each of these program codes is read by the control unit 11 as necessary, transferred to the RAM, read by the CPU, and executed as various means.

The media input / output unit 13 (drive device) inputs / outputs data, for example, media such as a CD drive (-ROM, -R, -RW, etc.), DVD drive (-ROM, -R, -RW, etc.) Has input / output devices.
The communication control unit 14 includes a communication control device, a communication port, and the like, and is a communication interface that mediates communication between a computer and a network, and performs communication control between other computers via the network. The network may be wired or wireless.

The input unit 15 inputs data and includes, for example, a keyboard, a pointing device such as a mouse, and an input device such as a numeric keypad.
An operation instruction, an operation instruction, data input, and the like can be performed on the computer via the input unit 15.
The display unit 16 includes a display device such as a CRT monitor and a liquid crystal panel, and a logic circuit (such as a video adapter) for realizing a video function of the computer in cooperation with the display device.

The peripheral device I / F (interface) unit 17 is a port for connecting a peripheral device to the computer, and the computer transmits and receives data to and from the peripheral device via the peripheral device I / F unit 17. The peripheral device I / F unit 17 is configured by USB, IEEE 1394, RS-232C, or the like, and usually includes a plurality of peripheral devices I / F. The connection form with the peripheral device may be wired or wireless.
The bus 18 is a path that mediates transmission / reception of control signals, data signals, and the like between the devices.

  FIG. 2 is a diagram showing an outline of the wiring design process. In the wiring design process according to the present embodiment, for example, optimal wiring design is performed based on initial design information (CAD information) created by a customer such as an automobile manufacturer.

  The designer inputs initial design information to the wiring simulation device 1 (step 101). The initial design information includes jig shape information, jig arrangement information, electric wire property information, electric wire route information, and the like. The input initial design information is stored in the storage unit 12 of the wiring simulation device 1. Details of the initial design information will be described later.

  Next, the control unit 11 of the wiring simulation device 1 simulates the wire wiring work using an analysis model that uses the input initial design information as a constraint (step 102). Details of the process for simulating the wiring operation of the electric wire will be described later.

  Next, the control unit 11 of the wiring simulation device 1 simulates the wire packing operation based on the simulation result in step 102 (step 103). Details of the process for simulating the wire packing operation will be described later.

  Next, the control unit 11 of the wiring simulation device 1 outputs the simulation results in steps 102 and 103 to the display unit 16 and the like (step 104). Details of the simulation result display process will be described later.

  The designer confirms the simulation result and determines whether or not to finish the wiring design (step 105). When continuing the wiring design, the designer appropriately changes the initial design information and inputs the initial design information to the wiring simulation apparatus 1. The controller 11 of the wiring simulation device 1 repeats Step 102 to Step 104.

  Next, the initial design information will be described with reference to FIGS.

  The jig shape information is the shape of a plane (= jig plane) that supports the electric wire. For example, when the jig is constituted by a support column embedded in the production board and a U-shaped support part disposed at the upper end of the support column, the jig plane is an area inside the U-shaped support part. .

  FIG. 3 is a diagram for explaining jig shape information. FIG. 3 is a view of the production board viewed from the horizontal direction. In FIG. 3, the jig 21 is indicated by a thick line, and the jig plane 23 is indicated by an oblique line. In an actual manufacturing board, when the electric wire passes through the jig plane 23, the electric wire is supported by the jig 21. On the other hand, when the electric wire does not pass through the jig plane 23, the electric wire is not supported by the jig 21. That is, the jig plane 23 indicates a range in which the electric wire can freely move while being supported by the jig 21. In order to simulate this, in this analysis model, the jig plane 23 is treated as a constraint condition.

  The jig arrangement information includes the jig arrangement position, the normal direction of the jig plane, and the like. You may make it calculate the arrangement | positioning position of a jig | tool based on the space | interval of the jig | tool arrange | positioned on a manufacturing board. In this case, an interval between jigs arranged on the production board may be input as initial design information.

  FIG. 4 is a diagram illustrating jig arrangement information. FIG. 4 is a view of the manufacturing board viewed from the vertical direction. In FIG. 4, jigs 21a to 21e and connectors 25a to 25c are shown as an example.

The dotted line portion of the jig indicates the side that is the upper end of the jig plane. The arrow of a connector has shown the extension direction when an electric wire is connected.
In an actual manufacturing board, the normal direction of the jig plane varies. Moreover, the position which can connect an electric wire with respect to a connector is limited. In order to simulate this, in this analysis model, the normal direction of the jig plane and the position where the electric wire can be connected to the connector are treated as constraints.

The physical property information of the electric wire includes the diameter and rigidity value of the electric wire.
Wire routing information includes the position (fixed position) of connectors and clips connected to the wire, the order of jigs through which the wire should pass, the order in which the wires are routed, the group of wires bundled as a subharness, etc. It is.

  FIG. 5 is a diagram for explaining physical property information and route information of an electric wire. FIG. 5 shows the route of the electric wire with respect to the arrangement of the jig shown in FIG. In FIG. 5, the electric wires 27a and 27b are shown as an example. The diameter of the electric wire 27b is larger than the diameter of the electric wire 27a.

The wire route information is in a list format. In the example shown in FIG. 5, the path information of the electric wire 27a is (connector 25a, jig 21a, jig 21b, jig 21c, connector 25b), and the path information of the electric wire 27b is (connector 25a, jig 21a, jig 21b). Jig 21d, jig 21e, connector 25c).
Further, the route information of the electric wire includes information such as which of the electric wire 27a and the electric wire 27b is wired first, and whether the electric wire 27a and the electric wire 27b are bundled as the same sub-harness.
In an actual manufacturing board, the jig | tool 23 which passes for every electric wire differs. In addition, the final product form changes depending on the order in which the wires are arranged. In addition, the diameter and rigidity of the electric wire are different for each electric wire. In order to simulate this, in this analysis model, physical property information and route information are given for each electric wire.

Next, the flow of processing for simulating the wiring work of electric wires by a computer will be described with reference to FIG.
FIG. 6 is a flowchart showing a flow of processing for simulating the wiring operation of electric wires. In FIG. 6, the variable of the electric wire is assumed to be L, and the subscript indicating the wiring arrangement order of the electric wire is assumed to be i.

  The control unit 11 of the wiring simulation device 1 substitutes 1 for the subscript i (step 201), and determines an arrangement point in each jig plane through which the electric wire L (i) passes (step 202). The determination of the arrangement point is based on the energy minimum principle spline method described later.

  Next, the control unit 11 of the wiring simulation device 1 interpolates a curve passing through the arrangement point in each jig plane determined in step 202, and determines the path of the electric wire L (i) (step 203). The path is determined based on the energy minimum principle spline method described later.

Next, the control unit 11 of the wiring simulation device 1 substitutes i + 1 for the subscript i (step 204) and confirms whether or not the routes of all the wires have been determined (step 205).
When the routes of all the electric wires have not been determined (No in Step 205), the control unit 11 of the wiring simulation device 1 repeats from Step 202.
When the routes of all the wires have been determined (Yes in step 205), the control unit 11 of the wiring simulation device 1 ends the process.

  As described above, the control unit 11 of the wiring simulation device 1 determines the path of the electric wires one by one based on the energy principle spline described later, and simulates the wiring operation of the electric wires.

  Next, the energy minimum principle spline method will be described with reference to FIGS. The energy minimum principle spline method extends the spline function and applies the energy minimum principle.

  FIG. 7 is a diagram illustrating the handling between the jigs of the electric wire. In FIG. 7, as an example, connectors 25a to 25b, jigs 21a to 21c, electric wire arrangement points 31a to 31e, and spring elements 33a to 33d are shown. The arrangement points 31a and 31e are fixed because they are connection points between the connectors 25a and 25b and the electric wires. The arrangement points 31b, 31c, 31d can freely move within the jig plane of the jigs 21a, 21b, 21c. In step 202 described above, the position of the movable arrangement point is determined for each electric wire. Here, the position of the arrangement point is expressed as two-dimensional coordinates on the jig plane.

  It is assumed that all the opposing jigs are connected by a spring element generally used in the finite element method. For example, the arrangement point 31a and the arrangement point 31b are connected by a spring element 33a. The spring elements 33a to 33d are for modeling the restoring force when the electric wire is displaced. By incorporating the jigs as spring elements into the calculation, it is possible to obtain realistic results while simplifying the model. For example, when a force is applied to an electric wire in a certain jig, it can be simulated that the arrangement point of another jig is also changed in conjunction.

  FIG. 8 is a diagram for explaining the handling of the electric wires in the jig plane. In FIG. 8, a jig 21f, a jig plane 23f, arrangement points 31f to 35h, and spring elements 35a to 35c are shown as an example.

In the above-described step 202, when the second and subsequent wires are laid out, another wire arrangement point may already exist in the jig plane. Considering such a case, it is assumed that the electric wires in the jig plane are connected by a spring element generally used in the finite element method. For example, the arrangement point 31f and the arrangement point 31g are connected by a spring element 35a. The spring elements 35a to 35c are for modeling the contact force between the electric wires in the jig plane. When the electric wires are arranged so as to overlap each other in the jig plane, a contact force corresponding to the overlapping area is applied to both the electric wires to correct the arrangement position. By incorporating the contact force between the wires as a spring element in the calculation, a realistic result can be obtained while simplifying the model. For example, when wiring the second and subsequent wires, the wires can be arranged so as not to overlap with the already arranged wires.
The arrangement point is expressed by a circle whose diameter is the diameter of the electric wire. Since it can consider that a diameter changes for every electric wire by this, the result according to the reality is obtained.

In the following, the formulation of the energy minimum principle spline method will be described.
In the energy minimum principle spline method, for example, shearing force, tension, and gravity are considered as the force applied to the electric wire. And the position of the arrangement point of the electric wire which minimizes the energy by these three forces is calculated. Further, a curve is interpolated so as to pass through the position of the calculated arrangement point, and the route of the electric wire is calculated.

FIG. 9 is a diagram for explaining the position coordinates of the electric wire.
In the energy minimum principle spline method, the position coordinates (three-dimensional coordinates) on the electric wire are represented by (x (t), y (t), z (t)).
In the example shown in FIG. 9, the position coordinates of the electric wire 27c at t = t1 are (x (t1), y (t1), z (t1)) = (x1, y1, z1), and the electric wire 27c is at t = t2. The position coordinates of (x (t2), y (t2), z (t2)) = (x2, y2, z2).

The bending rigidity of the wire is EI, the bending strain is εb, and the energy (bending energy) due to the shearing force is E1. The bending rigidity EI can be given for each electric wire.
The bending strain εb is defined by the following equation.
The bending energy E1 is defined by the following equation.

The tension of the electric wire is T, the elongation strain (green strain) is εe, and the energy related to the tension T (tensile energy) is E2. The tension T can be given for each electric wire.
The elongation strain εe is defined by the following equation.
The tension energy E2 is defined by the following equation.

FIG. 10 is a diagram illustrating a coordinate system for defining the own weight of the electric wire. In FIG. 10, the manufacturing board 41 is shown as an example. It is assumed that the manufacturing board 41 is inclined by an angle θ with respect to the XY plane in the coordinate XYZ system.
The weight of the wire in the coordinate XYZ system is w, the weight in the y direction in the coordinate xyz system is wy, the weight in the z direction in the coordinate xyz system is wz, and energy related to the weight ( The self-weight energy) is E3. The own weight w can be given for each electric wire.
The own weight wy in the y direction in the coordinate xyz system is defined by the following equation.
The own weight wz in the z direction in the coordinate xyz system is defined by the following equation.
The self-weight energy E3 is defined by the following equation.

From the above, E1, E2, and E3 are defined, and an overall function E (t, x (t), y (t), z (t)) = E1 + E2 + E3 is defined.
The shape function c (t) = (x (t), y (t), z (t)) of the electric wire can be expressed by an Euler-Lagrange equation that minimizes energy. Therefore, if a component of c is described as c again, the governing equation is defined by the following equation which is a constant coefficient fourth-order differential equation.
However, it is ^{_{σ 1 2 = T / EI,}} σ 2 = w / EI, w = w y or _{w z.}
The solution of the governing equation of equation (8) is a solution that satisfies the following equation.
However, a and b are constants.

Here, the shape function c (t) is represented by a section function C _i (t) (i = 1, 2,...) Defined for each section (between jigs) assuming a spline condition. The spline condition is a smooth connection between the interval functions at points on the jig plane. That is, each interval functions is a function of C ² class, is that the second derivative of interval functions adjacent equal.
The constants a and b in Expression (9) can be determined for each section (between jigs) from the spline condition. Moreover, the general solution of the inhomogeneous equation of equation (9) can be obtained by obtaining the special solution of the inhomogeneous equation of equation (9) by the undetermined coefficient method. That is, a general solution of the shape function c (t) of the electric wire is derived. Then, the shape function c (t) that minimizes the energy is determined based on c ′ (t).

  As described above, the shape function c (t) of the electric wire derived as a solution of the equation (9) is represented by a section function having a smooth connection defined for each jig, and is within the jig plane of each jig. It passes through the point where the energy applied to each wire is minimum. In this way, the shape function c (t) of the electric wire can be expressed by a section function, and the shape can be determined for each jig, as described with reference to FIG. This is because an optimization result of a certain jig propagates to an adjacent jig.

Although the actual product jig forming surface has a three-dimensional shape, in the embodiment of the present invention, each jig plane is configured in a two-dimensional plane space for efficient calculation. Assume that Then, after calculating a solution (arrangement position) in each jig plane (two-dimensional local coordinate system, see jig plane 23 in FIG. 3), the calculated solution is converted into a manufacturing board (three-dimensional global coordinate system, diagram). 10 (refer to the manufacturing board 41 of FIG. 10), and the solution (shape of the electric wire) in the manufacturing board is calculated. As a result, the calculation time of the optimization problem can be shortened as compared with the case where the solution (the shape of the electric wire) is directly calculated in the three-dimensional space. Furthermore, it is possible to analyze the arrangement behavior of the electric wires in the jig plane.
In the above description, three forces of shearing force, tension, and gravity are considered as the force applied to the electric wire, but any one or two may be used.

Next, the flow of processing for simulating a wire packing operation will be described with reference to FIG.
FIG. 11 is a flowchart showing a flow of a process for simulating a wire packing operation. In FIG. 11, the subharness variable is S, the subscript identifying the subharness is j, the jig plane variable is P, and the subscript identifying the jig plane is k. Since there may be a plurality of sub-harnesses for one jig plane, the variable P indicating the jig plane is determined depending on j and k.

  The control unit 11 of the wiring simulation device 1 substitutes 1 for the subscripts j and k (step 301), and simulates the packing of the sub-harness S (j) on the jig plane P (j, k) (step 302). ). Here, a plurality of electric wires to be packed in the sub-harness S (j) on the jig plane of the jig P (j, k) are selected to simulate the electric wire packing operation. Details of the process for simulating the wire packing operation will be described later.

Next, the control unit 11 of the wiring simulation device 1 substitutes k + 1 for the subscript k (step 303), and whether the processing target sub-harness S (j) has been simulated for packing on all jig planes. Confirm whether or not (step 304).
When not simulating all the jig planes (No in Step 304), the control unit 11 of the wiring simulation device 1 repeats from Step 302.
When all the jig planes have been simulated (Yes in Step 304), the control unit 11 of the wiring simulation device 1 substitutes j + 1 for the subscript j (Step 305), and has been simulated for all the sub-harnesses. (Step 306).
When not simulating all the sub-harnesses (No in Step 306), the control unit 11 of the wiring simulation device 1 repeats from Step 302.
When all the sub-harnesses have been simulated (Yes in Step 306), the control unit 11 of the wiring simulation device 1 ends the process.

  Thus, the control part 11 of the wiring simulation apparatus 1 selects the some electric wire used as the same packing object in the jig | tool plane of each jig | tool, and simulates a packing operation | work.

  Below, the detail of the process which simulates the packing operation | work of an electric wire is demonstrated. FIG. 12 is a diagram for explaining a process for simulating the packing operation of electric wires. FIG. 12A shows a state before simulation, and FIG. 12B shows a state after simulation.

In FIG. 12, as an example, a sub harness 43 a that bundles four electric wires and a sub harness 43 b that bundles three electric wires are shown. Moreover, 45a, 45b has shown the center of the some electric wire contained in subharness 43a, 43b, respectively.
The control unit 11 of the wiring simulation device 1 calculates the centers of a plurality of electric wires that are the same packing target. The arrangement point of the electric wire is expressed by a circle whose diameter is the diameter of the electric wire. Therefore, for example, the centers of the plurality of electric wires are points that are equidistant from the centers of the plurality of circles or the circumference. Further, for example, the centers of the plurality of electric wires may be calculated by weighting with the weight of the electric wires.

  Next, the control part 11 of the wiring simulation apparatus 1 applies a predetermined pressure toward the center of a some electric wire from the outer side of a some electric wire, and calculates the position of an arrangement | positioning point. The pressure to be applied varies depending on the exterior member to be packed. Examples of the exterior member include a tube, a sheet, and a tape. The circle indicating the arrangement point may be deformed by pressure in consideration of the rigidity of the electric wire.

In this way, as a method of arranging a plurality of circles in a predetermined region, for example, known documents (Makoto Arai, Takeshi Miyazawa, Yasunobu Kaji, Masaaki Minagawa, "Problem placement within a rectangle of a large number of discs", There is a method called a vibration control method described in the Transactions of the Japan Society of Mechanical Engineers (C) (Vol. 64, 627, 1998).
The vibration control method generally uses a “sieving” operation as a calculation model in which a fine adjustment of the position of an object is repeatedly performed by applying vibration when the object is packed in a container.
In the vibration control method, disk movement due to vibration, vibration control, collision between disks, collision at the boundary surface of the arrangement space, force acting on the disk, and the like are considered. In addition, the arrangement space is reduced as the disc moves.

  As shown in FIG. 12B, in the state after simulating the wire packing operation, the cross-sectional shape of the sub-harness is not limited to a circle, but the position where the wire to be packed is wired, the rigidity of the wire, and the like. According to this, various shapes such as an ellipse and a polygon are formed. Therefore, it is possible to obtain a simulation result that matches the reality.

Next, details of the simulation result display process will be described.
FIG. 13 is a diagram illustrating an example of a simulation result of the wiring work. FIG. 13 is a gray scale image of a color image. In the original drawing, the electric wires are color-coded.

  The control unit 11 of the wiring simulation device 1 displays a CG (Computer Graphics) image in which the curve form of the wire is expressed in three dimensions one by one on the display unit 16 as a simulation result of the wiring work. The wiring simulation device 1 according to the embodiment of the present invention can realistically represent each electric wire. In addition, the control unit 11 of the wiring simulation device 1 can calculate the wire length for each electric wire and display it on the display unit 16.

  As can be seen from FIG. 13, for example, all the electric wires are not wired on a virtual straight line connecting the jigs, but are greatly bent off the virtual straight line connecting the jigs. It is expressed that there is an electric wire to be wired.

  14 is a cross-sectional view taken along line AA in FIG. As can be seen from FIG. 14, even when passing through the same jig, it is expressed that the position of passing through the jig plane is different for each electric wire. Moreover, it is expressed that the diameters of the electric wires are also different. As described above, the wiring simulation apparatus 1 can represent variations in layout that occur in the actual product.

  FIG. 15 is a diagram illustrating an example of the simulation result of the packing operation. FIG. 15 is a gray scale image of a color image, and the sub-harness is color-coded in the original drawing.

  The control unit 11 of the wiring simulation device 1 displays on the display unit 16 a CG (Computer Graphics) image representing the sub-harness after packing in three dimensions as a simulation result of the packing operation. The wiring simulation device 1 according to the embodiment of the present invention can realistically represent the product form of the sub-harness.

  As can be seen by comparing FIG. 13 and FIG. 15, the difference between the state before the wire is wired and packed (wire state) and the state where the wire is packed into a sub-harness (product state) is expressed. ing.

  16 is a cross-sectional view taken along the line AA in FIG. As can be seen from FIG. 16, it is expressed that the sub-harness is configured by bundling wires having different diameters and rigidity. As described above, since the cross-sectional shape of the sub-harness is calculated based on the simulation result of the packing operation, it can be expressed that the sub-harness is not limited to a perfect circle but can be various shapes such as an ellipse and a polygon.

In the conventional technology for simulating each sub-harness, since the simulation is performed so that the shape of the sub-harness satisfies the product dimensions, variation in dimensions cannot be expressed. Therefore, when the wires are actually wired and packed one by one on the production board, the situation that the shape of the sub-harness does not satisfy the tolerance of the product dimensions has occurred.
On the other hand, in the embodiment of the present invention, since the packing operation is simulated by laying one electric wire at a time, it is possible to express a variation in dimensions that actually occurs. Therefore, by repeating the design until the tolerance of the product dimension is satisfied, it is possible to avoid a situation in which the shape of the sub-harness does not satisfy the tolerance of the product dimension at the time of manufacturing.

  In the above, the wiring design which fixes the arrangement information of a jig | tool, the shape information of a jig | tool, the physical property information of an electric wire, and the routing information of an electric wire, and outputs the layout and wire length for every electric wire was demonstrated. However, the wiring design using the wiring simulation apparatus 1 according to the embodiment of the present invention is not limited to this.

  The designer, for example, inputs a predetermined allowable range for the energy applied to the electric wire, and simulates the wiring operation of the electric wire so that the total sum of the wire lengths of all the electric wires is minimized with the energy within the input allowable range. You may do it. As a result, it is possible to perform a wiring design with reduced costs within the range of functioning as a product.

  The preferred embodiments of the wiring design method and the like according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these naturally belong to the technical scope of the present invention. Understood.

DESCRIPTION OF SYMBOLS 1 ......... Wiring simulation apparatus 21 ......... Jig 23 ......... Jig plane 25 ......... Connector 27 ......... Electric wire 31 ......... Arrangement point 33, 35 ......... Spring element 41 ......... Manufacturing Panel 43 ......... Sub-harness 45 ......... Center of multiple wires

Claims (8)

A wiring design method in which a computer performs wiring design of a wire harness,
An analysis model in which the control unit of the computer uses the input information on the shape of the jig embedded in the manufacturing board, the arrangement information of the jig, the physical property information of the electric wire constituting the wire harness, and the path information of the electric wire as constraints. in the wire by a connection which is defined between every jig table smooth interval functions to determine the shape function of the wire through the points where the energy applied to each wire in a jig within the plane of the jigs is minimized A first simulation process for simulating the wiring work of
The wiring design method , wherein the control unit includes an output step of controlling an output of a simulation result by the first simulation step . Based on the simulation result in the first simulation step , the control unit calculates the centers of the plurality of electric wires that are the same packing target in the jig plane of each jig, and goes from the outside of the electric wires toward the center. A second simulation step of simulating the wire packing operation by applying a predetermined pressure;
The wiring design method according to claim 1, wherein in the output step , the control unit controls output of a simulation result in the second simulation step.   The analysis model in the first simulation process is characterized in that the jigs facing each electric wire are connected by a spring element, and the electric wires are connected by a spring element in the jig plane. The wiring design method according to claim 1 or 2.   The wiring design method according to claim 3, wherein the energy in the first simulation step is a sum of bending energy, tension energy, and gravity energy. In the first simulation step, the control unit calculates a wire length for each electric wire based on a shape function of the electric wire,
The wiring design method according to claim 1, wherein in the output step, the control unit controls display of a layout and a line length for each electric wire. Before SL modeled first step, the control unit, characterized in that the sum of the line lengths of all the lines within the allowable range of the input energy to simulate the wiring work of the electric wire so as to minimize The wiring design method according to claim 1. A wiring simulation device for simulating a manufacturing process of a wire harness,
An acquisition means for acquiring shape information of a jig embedded in the production board, arrangement information of the jig, physical property information of the electric wire constituting the wire harness, and route information of the electric wire,
In the analysis model, a connection is defined between every jig table smooth interval functions, energy applied to each wire in a jig within the plane of the jig minimum to constraint the information acquired by the acquisition means A first simulation means for simulating the wiring work of the electric wire by obtaining the shape function of the electric wire passing through the point,
Output means for outputting a simulation result by the first simulation means;
A wiring simulation device comprising: A program for causing a computer to function as the wiring simulation device according to claim 7.