JP2005258643A - Device for assessing tolerance of path of linear, flexible object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for assessing the tolerance of the path of a linear, flexible object such as wire harness that allows analyzing the tolerance range of a laying path between constraint points using a finite element method and thus confirming the positional relationship of the path with respect to surrounding parts on a screen. <P>SOLUTION: The device includes a laying path analyzing means 10 for analyzing the standard laying path of the linear, flexible object using a finite element method while using shape data and constraint conditions as input conditions; a tolerance data storage means 11 for storing tolerance data included in the input conditions; a tolerance range analyzing means 12 for analyzing the tolerance range of the laying path with respect to the standard laying path using the finite element method on the basis of the input conditions and the tolerance data; and an image display means 14 for providing a graphic display of the three-dimensional shapes of the linear, flexible object and the surrounding parts along the standard laying path analyzed and a display of the tolerance range. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention analyzes a tolerance of a routing route of a linear flexible object to be routed by restraining a plurality of restrained portions spaced apart from each other to a restraint portion of a routing portion, and displays the tolerance on the screen of the image display device. Path tolerance evaluation of linear flexible objects for evaluating the possibility of mutual interference by displaying the linear flexible objects along the routing route and the three-dimensional shape of the peripheral part in the three-dimensional virtual space displayed on It relates to the device.

Stiffness analysis by the finite element method has been widely performed conventionally. For example, according to Patent Document 1, in order to reduce the number of prototypes when manufacturing automobile tires, the number of elements and the number of nodes are reduced to improve efficiency. A method of creating a tire analysis model that simulates overall tire performance in a mounted state such as deformation analysis is disclosed. On the other hand, in order to reduce the calculation load of deformation analysis and evaluate deformation analysis on the screen without relying on the finite element method, according to Patent Literature 2, the three-dimensional wire harness routed in the vehicle A data input process for design data, an image display process for displaying an image of reference wiring data in a 3D virtual space, a 3D design data display process for displaying 3D design data superimposed on a background image, and depending on the input A three-dimensional data transformation process for changing and displaying the shape of the wire harness, for example, by moving the three-dimensional design data in the three-dimensional virtual space with a mouse and corresponding to the reference wiring data image by polygon processing / display A three-dimensional virtual assembly method is disclosed. As a result, an attempt is made to avoid the occurrence of insufficient dimensions and unreasonable mounting angles when wiring to the vehicle as much as possible, and to set the routing state without repeating the trial production. According to Patent Document 3, the operation range of each part is calculated and each part exists in the display device so that the assembly error of the machine structure is recognized on the screen and the dimensional tolerance of each part is appropriately set. A CAD apparatus that displays a possible area has been proposed.
JP 2002-82998 A JP 2002-373533 A JP 07-287719 A

  Regardless of whether the analysis is based on the analysis finite element method including the analysis method of Patent Document 1 or Patent Document 2, the rigidity analysis generally obtains a specific analysis result for a specific input condition. For deformation analysis of linear flexible objects such as wire harnesses, pipes, etc., the deformation shape corresponding to the input conditions is uniquely confirmed. There is no analysis device that visually confirms deformation of a flexible object.

  Therefore, according to Japanese Patent Application No. 2003-189201, the present applicant specifies an image display unit that performs graphic display imitating the three-dimensional shape of a flexible object in a three-dimensional virtual space on the screen, and specifies a flexible object constrained at a predetermined part. Coordinate value recognition means for recognizing the movement position where the part is instructed and moved on the screen as the three-dimensional coordinate value of the three-dimensional virtual space, and the physical property data, shape data, and constraint conditions of the flexible object as input conditions Deformation analysis model is sequentially created by analyzing the deformation model of the initial state of flexible object with the movement of the specific part by the finite element method in response to the three-dimensional coordinate value data of the moved position An apparatus for analyzing deformation of a flexible object, wherein the image display means sequentially performs graphic display imitating the three-dimensional shape of the deformed flexible object in response to the analyzed deformation analysis model. The proposal.

  As a result, the deformation process of the entire shape of the object to be analyzed when moving a specific part of a linear flexible object that deforms with bending elasticity or bending is sequentially analyzed with a finite element method with high accuracy. The screen is designed to resemble the original shape. Therefore, there are problems associated with deformation such as interference with peripheral components when mounting flexible parts, or interference with peripheral components due to variations in the mounting state. It becomes possible to evaluate with high accuracy. However, including the CAD device that displays the operation range of the parts in consideration of the dimensional tolerance according to Reference 3, the routing path accompanying the tolerance of the linear flexible object is analyzed to evaluate the possibility of interference on the screen. No device has been proposed.

  In view of these points, the present invention analyzes the tolerance range of the routing route between the constraining points of the linear flexible object by the finite element method and makes it possible to confirm the positional relationship with the peripheral portion on the screen. An object of the present invention is to provide a path tolerance evaluation device for a flexible object.

  In order to achieve this object, according to the present invention, according to claim 1, the arrangement of a linear flexible object that is arranged by constraining a plurality of constrained parts spaced apart from each other to the restricting parts of the wiring part Analyzing path tolerances and displaying linear flexible objects along the routing path and the three-dimensional shape of the surrounding area in the three-dimensional virtual space displayed on the screen of the image display device. The linear flexible object path tolerance evaluation apparatus for evaluating the linear flexible object using the finite element method as the input condition of the physical property data, shape data and constraint conditions of the linear flexible object A route analysis means for analyzing the route, a tolerance data storage means for storing tolerance data of the input conditions, and analyzing the tolerance range of the route for the standard route by the finite element method based on the input conditions and tolerance data Tolerance range analysis means and 3D virtual space The linear flexible object along the analyzed standard installation path and the three-dimensional shape of the peripheral portion, characterized in that an image display means for causing the display of the graphic display as well as the tolerance range imitating.

  On the three-dimensional virtual space of the screen, the linear flexible objects along the analyzed standard routing route and the three-dimensional shape of the peripheral portion are displayed, and the tolerance range of the routing route is also displayed. Therefore, it is possible to evaluate the possibility of mutual interference from the positional relationship between the tolerance range and the peripheral portion on a three-dimensional display screen simulating an actual routing state.

  In order to make it possible to more accurately evaluate the possibility of interference, according to claim 2, the image display means replaces the display in the three-dimensional virtual space with a line viewed from the side along the interference surface in the peripheral portion. The flexible object is displayed as a two-dimensional image on the screen together with the peripheral portion and the tolerance range, or according to claim 3, there is provided an interference area determination means for determining the interference area of the tolerance range where the peripheral area interferes. Thus, the interference area is displayed on the screen by providing the interference area determination means for determining the interference area.

  In the case where the linear flexible object is an automobile wire harness and analysis is performed in consideration of a tolerance factor having a particularly large influence, according to claim 4, the linear flexible object is an instrument panel of the automobile or a body around it. A wire harness routed in the cable section, and the tolerance data storage means stores tolerance data of the distance between the constrained parts constrained to the constrained parts of a predetermined interval, so that the tolerance range analyzing means provides the tolerance. Analyzing the tolerance range of the wiring route of the wire harness as data input conditions.

  According to the invention of claim 1, the routing path of the linear flexible object is displayed on the three-dimensional virtual space together with its tolerance range and the peripheral portion, and the actual routing state can be confirmed together with the peripheral portion. Therefore, the possibility of interference with the surrounding area considering the tolerance of the routing route when mounting linear flexible objects or the interference during vibration assumed in the mounting state is also possible. The possibility can be evaluated on the screen. According to the invention of claim 2, the interference state can be accurately evaluated by allowing the linear flexible object to be viewed from the side in the direction along the interference surface in the peripheral portion. According to the invention of claim 3, the interference area of the linear flexible object is displayed on the screen, so that the possibility of interference can be easily evaluated. According to the invention of claim 4, the tolerance range of the wiring route of the wire harness of the automobile can be easily analyzed using only the variation that has a substantial influence as an input condition.

  A path tolerance evaluation apparatus for a wire harness that is a linear flexible object according to an example of an embodiment of the present invention will be described with reference to FIGS. 1 to 3. This apparatus is a wire harness 5 that is a bundle of wires having flexibility, bending elasticity, etc., which is routed on the back surface of the instrument panel of the automobile itself or on the routing portion of the body part around the instrument panel. This is to analyze the tolerance of the routing route with respect to the variation in the position setting of the constrained part. By using a computer, the image display device 1 displays on the screen 1a, the keyboard 2, the mouse 3, and the storage medium reader 4. And a CPU, a memory, and the like as a data processing device, and the following units are configured by operating according to a program.

  That is, the physical property data, shape data, and constraint conditions of the wire harness 5 (FIG. 3) are input from the input unit 1b, and the standard routing route with respect to the center line of the wire harness 5 is analyzed by a well-known finite element method. The routing route analysis means 10 for creating the standard routing analysis model M1 (FIG. 2), the tolerance data storage means 11 for storing tolerance data of the input conditions affecting the routing route analysis results, and the input conditions and tolerances Tolerance range analysis means 12 for inputting the data and analyzing the tolerance range of the routing route with respect to the standard routing route by the finite element method, and the tolerance range for the peripheral part of the body or parts in response to the judgment result The interference area determination means 13 for determining an interference area that may interfere with the wire harness 5 in the screen, and the tertiary of the screen 1a corresponding to the CAD three-dimensional coordinate system used for the analysis by the finite element method In the original virtual space, a graphic display imitating the three-dimensional shape of the wire harness 5 responding to the standard routing analysis model M1, a graphic display imitating the three-dimensional shape of a known peripheral part that may interfere, and a tolerance range A three-dimensional image for performing a three-dimensional graphic display of the tolerance range in consideration of the outer diameter of the wire harness 5 responding to the analysis result of the analysis means 11 and a graphic display of the interfered area responding to the analysis result of the interfered area determination means 13 An image display unit 14 having a display unit 14a and a two-dimensional image display unit 14b for performing two-dimensional display of the wire harness 5 from the side along a direction along the interference surface of the peripheral part and two-dimensional display of the tolerance range and the interfered area; Is provided.

  The routing path analyzing means 10 is a unit data of the wire harness 5 and physical properties data such as Young's modulus, Poisson's ratio, density, etc. of the unit wire, and their cross-sectional shape, number, shape data such as cross-section and length of the entire wire harness, and Constraint conditions such as the three-dimensional position of the restraint part of the wire harness 5, the standard distance between the restrained parts restrained by the restraint tool on the restraint part, and the routing direction at the restraint part defined by the structure of the restraint tool Is set as an input condition, for example, a standard routing analysis model M1 between the restrained portions of the wire harness 5 at intervals of 20 to 30 cm, for example, is created. At that time, the weight of the wire harness 5 is also set as an analysis condition based on the density and cross-sectional shape of the unit electric wire and the entire cross-sectional shape data.

  The tolerance data storage means 11 takes into account that the entire length of the wire harness 5 or the variation in the position of the restrained part to which the restraint is attached affects the tolerance range of the routing route in particular. For example, tolerance data of 1 cm, which is a variation in the distance between the constrained parts belonging to, is stored. Thereby, the tolerance range analyzing means 11 creates a tolerance analysis model M2 distributed around the standard routing analysis model M1 with respect to the wire harness length between the constrained parts corresponding to the error ± 0.5 cm, and further the wire Tolerance range data D1 having a wider range than the tolerance analysis model M2 corresponding to the outer diameter of the harness 5 is created. That is, as shown in FIG. 2, when the standard routing analysis model M1 is viewed in cross section, the weight is also an analysis condition. Therefore, the tolerance analysis model M2 has a lateral tolerance range with respect to a tolerance range of a perfect circle. Correspondingly, the tolerance range data D1 is narrower than the vertical direction, and the wire harness 5 indicated by the two-point difference line at the standard position is surrounded and widened in the vertical direction.

  As shown in FIG. 3A, the three-dimensional image display unit 14a intermittently displays a group of loop-shaped tolerance indicating lines L1 along the tolerance range data D1 with a solid line, and also displays the interference area determination unit 13 In response to the analysis result, the tolerance indicating line L1 is replaced with a dotted line in the interference area with the peripheral component 8 and displayed. As shown in FIG. 3B, the two-dimensional image display unit 14b displays a two-dimensional image in which the wire harness 5 is viewed from the side along the surface 8a serving as an interference surface of the peripheral component 8, and the tolerance range data D1. In response, the tolerance indication line L2 on both sides that is the widest perpendicular to the side view direction is displayed two-dimensionally with a solid line, and the interfered area is replaced with a dotted line.

  The operation of the wire harness path tolerance evaluation apparatus configured as described above will be described with reference to FIG. In the three-dimensional virtual space of the screen 1a, for example, the termination region of the routing portion is displayed by a selection command of the keyboard 2, and as shown in FIG. 3A, the wire harness 5 is provided by a clamp 6 attached in advance to the constrained portion. The connector 7 which is restrained by a counterpart clamp provided at the restraining part P1 of the routing portion and further attached to the tip is detachably restrained by the connector seat 7a of the next last restraining part P2. The deformed shape of the wire harness 5 between the restraint site P1 and the restraint site P2 has a wiring direction in which the tip of the wire harness 5 is bent about 90 ° with respect to the routing direction along the routing portion at the approach position of the restraint site P2. As a result of the analysis as a constraint condition, the distal region of the wire harness 5 is bent in a state of being greatly bent corresponding to the standard routing analysis model M1 and is graphically displayed along with the peripheral component 8 in a three-dimensional shape.

  Overlaid on such a virtual three-dimensional image, a loop-like tolerance indicating line L1 that surrounds the wire harness 5 is graphically displayed at a predetermined interval, and an area to be interfered with the surface 8a of the peripheral component 8 That is, the intrusion area into the peripheral component 8 is clearly displayed with a dotted line. In order to confirm the degree of interference accurately, for example, when the display of the screen 1a is switched by an input command from the keyboard 2, as shown in FIG. 3B, the wire harness 5 is viewed from the side along the surface 8a serving as an interference surface. The two-dimensional image to be displayed is displayed, and the interfered area is displayed with a dotted line, so that the interference state between the wire harness 5 and the peripheral component 8 can be accurately confirmed.

  By switching the screen 1a, the tolerance range of the routing route in the routing direction along the routing portion between the clamps 6 of the wire harness 5 on the proximal end side can be evaluated, and the interference edge portion in the vertical direction can also be evaluated. Alternatively, the same analysis can be performed for the interference surface. As a result, for the wire harness 5 that is set and arranged at a predetermined interval along the routing portion by setting the rigidity or restraint portion of the wire harness, the distance between the restrained portions to which the restraint is attached or Taking into account variations in the overall length of the wire harness, etc., it is possible to easily and accurately evaluate whether or not it will interfere with surrounding parts or bodies, reducing the number of prototypes when manufacturing vehicles can do.

  The present invention can also be applied to a case where pipes exhibiting bending elasticity as a linear flexible object are intermittently assembled with a clamp, and if necessary, tolerance data such as a cross-sectional shape or physical properties is used as an input condition for the routing route. It is also conceivable to analyze the variation with higher accuracy.

It is a figure which shows the structure of the path | route tolerance evaluation apparatus of the linear flexible object by embodiment of this invention. It is a figure explaining the principle of operation of the device. It is a figure explaining the screen display state of the same apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Screen 5 Wire harness 6 Clamping tool 7 Connector 8 Peripheral part 8a Surface of peripheral part used as interference surface D1 Tolerance range data L1, L2 Tolerance indication line M1 Standard routing analysis model M2 Tolerance analysis model

Claims (4)

Analyzed the tolerance of the routing route of the linear flexible object that is constrained by the restrained part of the routing part at several places that are spaced apart from each other, and displayed on the screen of the image display device In a linear flexible object path tolerance evaluation apparatus for evaluating the possibility of mutual interference by displaying the three-dimensional shape of the linear flexible object and the peripheral part along the routing path in a three-dimensional virtual space There,
The routing data analyzing means for analyzing the standard routing path of the linear flexible object by the finite element method using the physical property data, the shape data and the constraint condition of the linear flexible object as input conditions, and the tolerance data of the input conditions Tolerance data storage means for storing, tolerance range analysis means for analyzing a tolerance range of the routing path with respect to the standard routing path by a finite element method based on the input condition and the tolerance data, and on the three-dimensional virtual space And a graphic display imitating the three-dimensional shape of the linear flexible object and the peripheral portion along the analyzed standard routing route, and an image display means for displaying the tolerance range. A path tolerance evaluation device for linear flexible objects.   Instead of displaying in the three-dimensional virtual space, the image display means displays a linear flexible object viewed from the side along the interference surface of the peripheral portion as a two-dimensional image on the screen together with the peripheral portion and the tolerance range. The apparatus for evaluating a path tolerance of a linear flexible object according to claim 1.   The line according to claim 1 or 2, wherein the interfered area is displayed on a screen by providing an interfered area determining means for determining an interfered area in a tolerance range in which a peripheral part interferes. Path tolerance evaluation device for flexible objects. A wire harness in which a linear flexible object is routed to a routing portion that is a body of an instrument panel or its surroundings,
The tolerance data storage means stores the tolerance data of the distance between the constrained parts constrained by the constrained parts of a predetermined interval, so that the tolerance range analysis means can also route the wire harness using the tolerance data as an input condition. The path tolerance evaluation apparatus for linear flexible objects according to any one of claims 1 to 3, wherein a path tolerance range is analyzed.

Images