JP4993505B2 - Validity verification device for body parts design - Google Patents

Description

The present invention relates to an apparatus for verifying the validity of design of a vehicle body part, and more particularly to an apparatus for verifying the validity of a design when designing a vehicle body part made of resin by CAE taking into account its own weight deformation.

  In recent years, for the purpose of reducing the weight of a vehicle body or reducing material costs, for example, materials for large parts such as bumpers and instrument panels have been replaced with steel materials.

  In this case, since the resin material is less rigid than the metal material such as steel, it is necessary to consider the influence of the deflection deformation due to the weight of the vehicle body part on the design surface of the vehicle body when it is attached to the vehicle body.

  In particular, when large parts such as bumpers are made of resin material, the influence on the design surface of the car body due to its own weight deformation becomes significant.For example, the gap between other parts becomes conspicuous. The design or appearance may be deteriorated. For this reason, for this type of parts, in order to reduce the cost of part design by reducing the number of times the mold is modified / changed, part design that takes into account its own weight deformation at the time of mounting the vehicle body has been studied.

As a means for performing the above design, for example, Patent Document 1 below discloses a prediction method and apparatus for a self-weight deformation amount generated when a resin molded product such as a bumper is assembled to a support such as a metal frame. Yes.
JP 2007-38600 A

  Thus, although self-weight deformation prediction of a resin molded product by simulation is known, means for effectively using this kind of simulation, specifically, for evaluating and verifying the validity of the simulation result. Currently, no means have been established yet. Especially for parts such as bumpers with complicated three-dimensional shapes, it is difficult to accurately predict the deformation, and the molding accuracy of resin parts varies depending on the actual molding conditions. Establishment of an evaluation method capable of appropriately performing quantitative evaluation of self-weight deformation of a resin molded product is desired.

  In view of the above circumstances, it is a technical problem to be solved by the present invention to appropriately evaluate and verify the validity of body part design by CAE.

  The present invention has been made to solve the above problems. That is, the verification method of the validity of the vehicle body part design according to the present invention evaluates the deformation due to the weight of the vehicle body part when the resin vehicle body part is attached to the corresponding vehicle body, and the design of the vehicle body part is based on this evaluation. A method for verifying validity, wherein a self-weight deformation of a vehicle body part is evaluated using a jig provided with a support portion capable of supporting the vehicle body part at a mounting position on the vehicle body, and the following steps: A first stage for identifying a position at which the self-weight deformation is offset by lifting the body part in the support state based on the displacement data of the support part acquired with the state before supporting the body part as a reference position; The second stage of acquiring the body weight deformation data of the vehicle body part based on the position data of the body part in the support state and the position data of the body part at the position where the weight deformation is offset, and the CAE of the body part By the the self-weight deformation prediction data comparison of the obtained self-weight deformation data in the second stage, characterized with a point and a third step of quantitative evaluation of the deviation from its own weight deformation prediction data.

  As described above, in the present invention, first, the body part can be supported by the jig at the position where it is actually attached to the vehicle body, and the self-weight deformation that occurs when the body part is actually attached to the vehicle body is reproduced. In addition, the displacement data of the support portion of the jig used at this time is acquired as the reference position from the state before supporting the vehicle body parts, and the weight deformation is performed by lifting the supported vehicle body parts based on the displacement data. By identifying the position where the offset is offset, it became possible to quantitatively evaluate the actual weight deformation of the body parts. That is, since the support portion receives all the weight of the supported vehicle body part, the displacement data of the support portion corresponds to the vehicle body part when the displacement data in the state before the vehicle body part is attached. Can be considered as if no deformation has occurred due to its own weight. Therefore, in the subsequent stage (second stage), it is possible to acquire the position data of the body parts when there is no weight deformation, and thereby quantitatively evaluate the deformation due to the weight of the actual body parts. Can do. Therefore, in the third stage, the deviation from the self-weight deformation prediction data can be quantitatively and accurately evaluated by comparing the self-weight deformation prediction data acquired by CAE and the self-weight deformation data acquired in the second stage. Thereby, it becomes possible to easily determine whether or not the design change of the vehicle body part is necessary. Further, since the contents of correction of the corresponding molding die can be quantified, the number of times of correction of the die can be reduced.

  In addition, the verification device for the validity of design of a vehicle body part according to the present invention, which has been made in order to solve the above problems, evaluates deformation due to the weight of the vehicle body part when the resin vehicle body part is attached to the corresponding vehicle body. , An apparatus for verifying the validity of the design of the vehicle body part based on this evaluation, a jig provided with a support portion capable of supporting the vehicle body part at a mounting position on the vehicle body, and a state before supporting the vehicle body part Displacement data acquisition means for acquiring displacement data of the support portion with reference position as a reference position, lifting means for lifting the supported body part, position data acquisition means for acquiring position data of the body part, and displacement data of the support part Based on the above, the position where the weight deformation is canceled by lifting the supported body part is determined, and the position data of the body part in the supported state and the position of the body part at the position where the weight deformation is canceled By comparing the weight deformation data acquisition means for acquiring the weight deformation data of the vehicle body part based on the data and the weight deformation prediction data acquired by the CAE of the body part and the weight deformation data, the deviation from the weight deformation prediction data is quantitatively determined. It is characterized by the point provided with the evaluation means to evaluate.

  By using the verification device having such a configuration, deformation due to its own weight when the vehicle body part is actually attached to the vehicle body is reproduced. In addition, by lifting the body part in a supported state based on the displacement data of the support part, the lifting force and the weight of the body part cancel each other, and the body part is not deformed by its own weight. It can create a state that can be regarded as something. Therefore, it is possible to obtain the same operational effect as that obtained by the verification method according to the present invention described above.

  Here, the displacement data of the support part to be acquired may be a displacement amount of the actual support part in a vertically downward direction, or may be a strain in a predetermined region of the support part. This is because the purpose is not to quantify the deformation of the support portion during the deformation of its own weight, but to specify the position where the lifting force and the weight of the body parts are balanced. For this reason, the type of the displacement data is not limited as long as the position of the vehicle body part when it matches the displacement data in the state (reference position) before supporting the vehicle body part can be accurately grasped. Of course, in practice, the amount of deformation of the support portion due to only the weight of the vehicle body part is not so large, so in consideration of this point, the strain amount at a predetermined position of the support portion may be acquired as displacement data. . In this case, for example, a strain gauge is attached to the surface of the support portion, and a strain value (electric resistance as strain) measured by the strain gauge at the reference position is used as a reference value. Then, by lifting from the supported state, it is possible to evaluate the self-weight deformation with the position of the body part when the strain value matches the reference value as the position where the self-weight deformation is offset. In this way, since the weight of a large resin molded product such as a bumper can be detected with high accuracy within the range of elastic deformation, the position where the deformation due to the weight is offset by lifting the body part is accurately specified. be able to.

  The shape of the support portion is not particularly limited. For example, if displacement data is acquired using a strain gauge as described above, the support portion is in a cantilever shape and is arranged along the longitudinal direction of the beam. A directional strain gauge can also be attached. In this way, it is possible to measure the amount of deformation of the support portion accompanying the mounting of the vehicle body as large and accurately as possible. From the same point of view, the support part does not require bending rigidity as much as the jig body, and as long as it can accurately detect its own weight deformation, it can be made thinner or made of a less rigid material. It is also possible to change.

  For example, a jack mechanism can be cited as a means for lifting the body parts. As an example, there can be mentioned a structure in which a jack mechanism is arranged at the lower part of a bumper which is a resin molded product, and a supported body part is supported and lifted from the lower part. At this time, the lifting positions and the number of the body parts are preferably set appropriately according to the type and shape of the body parts. For example, when the body parts are bumpers, the bottom part of the bumper or the air intake port (bumper It is also possible to lift a middle step portion or the like serving as an opening) by a plurality of jack mechanisms. Further, in order to accurately reproduce the state in which the body part is not deformed by its own weight, the part directly under the center of gravity of the body part may be lifted. Of course, in addition to supporting and lifting at a plurality of points, if possible, it may be supported and lifted by a surface.

  In terms of the relationship with the support portion, for example, a position as far as possible from the position supported by the support portion of the vehicle body parts may be supported and lifted. When a large body part has a considerable weight, if the body part is partially supported and lifted by a jack or the like, the support part is locally deformed, and the displacement data acquired by the support part is adversely affected. This is because there is a risk that the weight will be lifted above the position where the dead weight is actually canceled. In this regard, for example, when a bumper is used as a vehicle body part, the upper part thereof is mainly supported. Therefore, the lower part of the bumper (the lowermost surface or the like) may be lifted by a jack mechanism. In this case, since the region that affects the design surface is mainly the region from the upper part of the bumper to the side part, local deformation at the lower part is preferable in that it hardly affects the design surface.

  Further, from another viewpoint, for example, when supporting a vehicle body part with a plurality of support portions, displacement data of all of the plurality of support portions is acquired, and the self-weight deformation is canceled based on all the displacement data. The position may be specified. In other words, the arrangement position and the number of jack mechanisms may be set so that all of the displacement data in the plurality of support portions can be reproduced in a state where the displacement data acquired at the reference position of the vehicle body part matches. Good. In the case of a body part of a size in which its own weight deformation is a problem, just because one support part has been restored to the reference position, it cannot be said that the whole body part has been restored to the position or shape in which its own weight deformation has been offset. This is because the case may be considered. Therefore, as described above, by specifying the position where the self-weight deformation is canceled based on the displacement data in the plurality of support portions, the accuracy with respect to the self-weight deformation canceling position is improved, and more reliable evaluation and verification are performed. be able to.

  As described above, according to the present invention, it is possible to appropriately evaluate and verify the validity of the vehicle body part design by CAE, so that it is possible to effectively and efficiently correct or change the molding die. Become.

  Hereinafter, an embodiment of a method for verifying validity of vehicle body part design according to the present invention will be described with reference to the drawings. In this embodiment, a case where the bumper is a resin body part will be described as an example.

  FIG. 1 is a flowchart showing the procedure of the verification method in this embodiment. As shown in this chart, the present verification method obtains position data at the weight deformation position of the bumper that is fixed to the support portion in step S1 of starting strain measurement of the support portion (so-called nest) before the bumper is attached. Step S2, lifting bumper at its own weight deformation position to a position where its own weight deformation is canceled, step S3, obtaining bumper position data at its own weight deformation canceling position, and position data of the bumper at its own weight deformation position and its own weight deformation cancellation Step S5 for obtaining bumper weight deformation data based on position data at the position, Step S6 for obtaining bumper weight deformation prediction data by CAE, and weight change data obtained in step S5 and weight change obtained in step S6 Quantitative evaluation of deviation from self-weight deformation prediction data by comparison with prediction data And a stage S7 that. In the present verification method, it is assumed that the bumper 11 designed based on the self-weight deformation prediction data acquired in advance by the CAE in step S6 is used as the measurement target of the self-weight deformation.

  FIG. 2 is an overall configuration diagram of the verification apparatus 10 used in the verification method. As shown in the figure, the verification apparatus 10 acquires a jig 13 provided with a support portion 12 capable of supporting a bumper 11 to be verified at a mounting position on the vehicle body, and displacement data of the support portion 12. The displacement data acquisition means 14, the lifting means 15 for lifting the bumper 11 supported by the support portion 12 vertically upward, and the position data acquisition means 16 for acquiring the position data of the bumper 11 are main components. Prepare. Further, based on the displacement data of the support portion 12, the position where the weight deformation is canceled by lifting the supported bumper 11 vertically upward is specified, and the bumper 11 in a state where the bumper 11 is supported with its own weight deformation is identified. Self-weight deformation data acquisition means for acquiring the self-weight deformation data of the bumper 11 based on the position data and the position data of the bumper 11 at a position where the self-weight deformation is canceled, and the self-weight deformation prediction data acquired by the CAE of the bumper 11; Each of the evaluation means for quantitatively evaluating the deviation of the bumper 11 from the self-weight deformation prediction data by comparison with the self-weight deformation data acquired by the self-weight deformation data acquisition means is installed in the attached computer 17 as a program. Of course, each of the arithmetic processing means may be separately provided as a computer including these processing programs.

  Here, the details of each component will be described. First, the support portion 12 is provided in the jig 13 at a position corresponding to the mounting position of the bumper 11 on the vehicle body, and is thus attached to the support portion 12. The bumper 11 can reproduce the deformation of its own weight when it is actually attached to the vehicle body. Here, as shown in FIG. 2 and FIG. 3A, the support portion 12 is substantially beam-shaped, and the free end side of the beam-shaped portion 18 connected to the jig 13 is bent vertically upward. Has a shape. Then, by fixing the bent portion 19 to the vehicle body mounting portion 20 provided at the upper end of the bumper 11 with the crimping pin 21, the bumper 11 is supported by each support portion 12 while allowing its own weight deformation. It has become.

  The displacement data acquisition means 14 includes the same number of strain gauges 23 as the support portions 12 and a strain amplifier 24 for amplifying the electrical resistance as displacement data acquired by the strain gauges 23 to generate displacement data. In this embodiment, the strain gauge 23 is not a beam-like portion 18 extending in the horizontal direction from the jig 13 in the support portion 12, but is thinner than the beam-like portion 18 and is bent at the free end of the beam-like portion 18. Attached to the surface of the part 19. Further, if a one-way type is used, it is applied to the surface of the bent portion 19 along the direction in which the bumper 11 undergoes its own weight deformation, for example, along the vertical direction in FIG. You can do it. Of course, a multi-direction type strain gauge may be used.

  The lifting means 15 is constituted by a jack mechanism as shown in FIG. 2, for example, and supports the center in the left-right direction of the lowermost portion 22 (see FIG. 3A) of the bumper 11 as shown in FIG. Are arranged so as to push upward vertically. In the case of using one jack mechanism as in this embodiment, the jack mechanism is provided directly below the center of gravity of the target vehicle body part (bumper 11) or directly below the support portion 12 closest to the center of gravity. Can be arranged. Further, if a plurality of jack mechanisms are used, the jack mechanisms can be arranged directly below all the support portions 12.

  The position data acquisition unit 16 includes an imaging device for imaging the bumper 11 supported by the jig 13 via the support unit 12. For example, each of the position data acquisition unit 16 includes a plurality of image data obtained by imaging the same object. By extracting coordinate data at a predetermined position specified in advance, the movement amount or movement direction of the corresponding position can be accurately acquired. In addition, although illustration is abbreviate | omitted, the corresponding predetermined marker etc. can also be used for the specification of the position which can extract coordinate data, for example. In this case, it is possible to obtain the three-dimensional coordinates of the marker position by pasting the marker on the surface of the object (bumper) and imaging it with a dedicated imaging device (camera). At the same time, it is possible to easily and accurately specify the three-dimensional coordinates by reflecting the scale bar serving as the absolute coordinate reference in the image data.

  Hereinafter, a method of evaluating the bumper's own weight deformation using the verification apparatus 10 having the above configuration and a method of verifying the validity of the bumper design by CAE based on this evaluation will be described.

  First, measurement of strain (electric resistance) of the support portion 12 before mounting the bumper 11 is started (step S1). At this stage, since the bumper 11 is not attached to any of the support portions 12, the deformation (strain) due to the weight of the bumper 11 is naturally zero. Therefore, as shown in FIG. 3B, the strain value at this time is set to zero, and the strain measurement is continuously performed thereafter.

  Next, the position data at the position where the bumper 11 is fixed to the support 12 at its own weight deformation position is acquired (step S2). Specifically, the bumper 11 supported by each support unit 12 and deformed by its own weight is imaged by the imaging device of the position data acquisition means 16, and the three-dimensional coordinate data at a predetermined position is obtained from the image data obtained by imaging. obtain. The strain generated in the support 12 at this time varies as shown in FIG. That is, in step S1 before mounting the bumper 11, the strain was zero, but when the bumper 11 is fixed to the support portion 12 and deformation due to its own weight occurs, the support portion 12 is also deformed in accordance with the deformation of its own weight. . Therefore, a considerable amount of strain occurs in the strain measurement region of the support portion 12.

  In this way, when the position data acquisition of the bumper 11 at the self-weight deformation position is completed, the bumper 11 at the position is moved to a position where the self-weight deformation of the bumper 11 is canceled using the jack mechanism (lifting means 15). Push up (step S3). Here, the position at which the deformation of the bumper 11 is canceled is performed based on the strain value measured at the support portion 12. That is, as shown in FIG. 4B, the strain value that was zero in the support portion 12 before the bumper 11 is attached temporarily rises to a predetermined value as the bumper 11 is attached. Accordingly, by pushing up the bumper 11 to a position where the strain value becomes zero again (see FIG. 4B), the weight of the bumper 11 and the pushing force by the jack mechanism are balanced, and there is no deformation due to the weight. The bumper 11 can be placed in a state that can be considered.

  Subsequently, position data of the bumper 11 placed in the above state, that is, the bumper 11 placed at a position where the self-weight deformation is canceled is acquired (step S4). Specifically, as in the case of step S2, the bumper 11 at the self-weight deformation canceling position is imaged by the imaging device of the position data acquisition means 16, and the three-dimensional coordinate data at the predetermined position is obtained from the image data obtained by imaging. Get.

  In this way, after obtaining the position data of the bumper 11 at its own weight deformation position and the position data at its own weight deformation canceling position, the weight deformation data of the bumper 11 is obtained based on these data (step S5). That is, in this embodiment, since each position data is a set of three-dimensional coordinate data at a predetermined position on the same and a plurality of bumper 11 surfaces, the three-dimensional coordinates for each data acquisition position on the corresponding bumper 11 surface. By taking the difference in data, particularly the difference in the vertical direction component, the quantitative deformation amount in the vertical direction at the data acquisition position can be acquired. In addition, at this time, a quantitative deformation amount (protruding amount or retreating amount) of the bumper 11 in the longitudinal direction of the vehicle body can be acquired by taking the difference in the longitudinal direction component of the vehicle body.

  The self-weight deformation data of the bumper 11 acquired through the above steps (steps S1 to S5) is used for comparison with the self-weight deformation prediction data of the bumper 11 acquired by the means described below. Here, the weight deformation prediction data of the bumper 11 can be obtained by using a known CAE program with the shape, weight of the bumper 11 or its mounting mode (boundary conditions, etc.) as parameters (steps). S6). In this case, it is important that the self-weight deformation prediction data to be acquired includes data that can be compared with the self-weight deformation data at each data acquisition position acquired in step S5. That is, in this embodiment, it is necessary to acquire the own weight deformation prediction data at the same position as the predetermined position on the surface of the bumper 11 from which the three-dimensional coordinate data and the own weight deformation data are acquired in steps S1 to S5.

  The self-weight deformation data of the bumper 11 thus obtained is compared with the self-weight deformation prediction data, and the deviation from the actual prediction data of the free deformation of the bumper 11 is quantitatively evaluated by this comparison (step S7). Specifically, by calculating the difference between the self-weight deformation data for each predetermined position on the surface of the bumper 11 and the self-weight deformation prediction data, the magnitude of deviation from the actual free deformation prediction data for each point is calculated. . Accordingly, it is possible to determine whether or not the design change of the bumper 11 is necessary based on the magnitude of the deviation amount or the portion where the deviation amount is large. In this case, the large amount of deviation is a problem mainly because it is likely to affect the design surface of the bumper 11, so that it is adjacent to the bumper 11 such as a fender, a headlamp, and a hood (bonnet) in advance. It is preferable to acquire three-dimensional coordinate data at a location close to the part to be processed. In addition, an appropriate threshold is set for the magnitude of the difference between these three-dimensional coordinate data, and when the difference value exceeds this threshold (when a considerable amount of deviation is observed), a design for correcting the deviation is provided. It goes without saying that a process for automatically determining that a change should be made may be further incorporated into the evaluation program.

  As described above, one embodiment of the method for verifying the design validity of the vehicle body part according to the present invention has been described by taking a case where the bumper is a resin body part, but the present invention is not limited to this form. Of course, other specific forms can be adopted within the scope of the invention.

  For example, in the above-described embodiment, the case where the position data at the self-weight deformation position is acquired before the position data at the self-weight deformation canceling position of the bumper 11 has been described, but it is not particularly necessary to be in this order. After obtaining the position data at the self-weight deformation canceling position, the jack mechanism is removed, the bumper 11 is lowered to the self-weight deformation position, and the position data of the bumper 11 in that state, that is, the position data at the self-weight deformation position is obtained. Also good.

  Further, regarding the position and number of the support portions 12 on the jig 13, it is possible to accurately determine the self-weight deformation canceling position that the support portions 12 are disposed at all the mounting positions of the bumper 11 on the actual vehicle body. However, it is not always necessary to provide the support portions 12 at all the attachment positions. As long as the reproducibility of the self-weight deformation can be ensured, the number of support portions 12 to be disposed may be minimized. Further, as long as the self-weight deformation offset position can be specified, the position where the strain gauge 23 is attached (strain measurement location) may be minimized. For example, in the case of the bumper 11 having the shape shown in FIG. 2, it is sufficient if the support portions 12 are respectively disposed at the upper mounting positions (three locations) of the vehicle body. Further, it is sufficient that the strain value at least at the center support portion 12 can be measured. Of course, you may provide the support part 12 in the position corresponding to other actual vehicle body attachment positions, such as a lower part and a middle step part. Further, the specific support mode of the support portion 12 and the bumper 11 is not limited to the illustrated mode, and is appropriately set according to the shape of the body part to be supported or according to the actual mounting mode. be able to.

  Moreover, regarding the displacement data acquisition means 14, in the said embodiment, although the strain value produced in the support part 12 was measured using the strain gauge 23, of course, it is not limited to this means. The means is arbitrary as long as data on the displacement of the entire support part 12 or a part thereof can be acquired, and various strain measurement means (contact type or non-contact type. If non-contact type, laser displacement meter, etc.) In addition, it is possible to use means capable of indirectly measuring strain, such as stress measurement by X-rays.

  Moreover, although the case where the jack mechanism was used was illustrated as the lifting means 15 in the above-described embodiment, it is not particularly limited to this means. Any lifting means can be used as long as the bumper 11 supported by the support portion 12 can be pushed up. Alternatively, it is possible to employ means for lifting the bumper 11 in a mode other than pushing up from below, such as picking up or holding a part of the bumper 11 and lifting it. Further, the lifting means 15 may be configured to support and push up the entire surface of the lowermost part 22 of the bumper 11 if possible. It is not always necessary to lift the bumper 11 vertically upward. This is because, depending on the shape of the bumper 11 and the contact state with the vehicle body, the bumper 11 may hang down by its own weight slightly obliquely rather than vertically downward.

  Further, the position data acquisition means 16 is not limited to the means disclosed in the above embodiment. For example, a vertical direction of a predetermined point on the surface of the bumper 11 using a non-contact displacement meter such as a laser displacement meter instead of the imaging device. It is also possible to measure the displacement component.

  Further, for example, in the above embodiment, the case where the bumper is a resin body part has been described. However, the present invention is not limited to this part. Other than bumpers, for example, inner panels and back doors, as long as they are large parts that are actually molded from resin (regardless of whether they are interior parts or exterior parts), or large parts that can be molded from resin As long as it is a component, the verification method or verification apparatus according to the present invention can be applied. In this case, the description in the case where the vehicle body part is made of the resin bumper 11 is similarly applied to the other large resin body parts.

It is a flowchart of the verification method of the design validity of the vehicle body part which concerns on one Embodiment of this invention. It is a whole block diagram of the verification apparatus of the design validity of a vehicle body part. (A) is principal part sectional drawing in the periphery of a support part when a bumper is supported by the support part in the state which carried out weight change, (b) is until a bumper is supported by the support part and the state which carried out self-weight deformation is reached. It is a graph which shows the time fluctuation of the strain value in a support part. (A) is a cross-sectional view of the main part around the support part when the bumper is pushed up to its own weight deformation canceling position, and (b) is the support part until the bumper is pushed up to its own weight deformation canceling position. It is a graph which shows the time fluctuation | variation of the distortion value in.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Verification apparatus 11 Bumper 12 Support part 13 Jig 14 Displacement data acquisition means 15 Lifting means 16 Position data acquisition means 22 Bottom part 23 Strain gauge

Claims (1)

A device for evaluating deformation due to the weight of the vehicle body part when the resin vehicle body part is attached to a corresponding vehicle body, and verifying the validity of the design of the vehicle body part based on this evaluation,
A jig provided with a support portion capable of supporting the vehicle body part at a mounting position on the vehicle body;
Displacement data acquisition means for acquiring displacement data of the support portion with a state before supporting the vehicle body part as a reference position;
Lifting means for lifting the body parts in a supported state;
Position data acquisition means for acquiring position data of the vehicle body parts;
Based on the displacement data of the support part, identify the position where the weight deformation is canceled by lifting the body part in the support state,
Self-weight deformation data acquisition means for acquiring the self-weight deformation data of the vehicle body part based on the position data of the vehicle body part in a support state and the position data of the vehicle body part at a position where the self-weight deformation is offset;
Validity verification apparatus for vehicle body part design comprising evaluation means for quantitatively evaluating a deviation from the self-weight deformation prediction data by comparing the self-weight deformation prediction data obtained by CAE of the vehicle body part and the self-weight deformation data .

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