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Body-in-white structure optimization design method and body-in-white structure optimization design device

An optimized design and body-in-white technology, applied in computing, instrumentation, electrical digital data processing, etc., can solve problems such as poor optimization reliability and difficulty in screening variables in body-in-white structure design

Active Publication Date: 2019-09-06
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the existing technical problems, the present invention provides a body-in-white structure optimization design method and a structure optimization design device, which solves the problems of the existing body-in-white structure design variable selection difficulty and poor optimization reliability

Method used

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Embodiment 1

[0091] see figure 1 , the present embodiment provides a weighted relative sensitivity-based optimal design method for the body-in-white structure, which includes the following four steps (steps 1 to 4), and of course other steps may also be included in some other embodiments.

[0092] Step 1. Obtain the 3D model of the body in white first, then divide the 3D model into a finite element mesh to establish a corresponding finite element model of the body in white, and finally check the mesh quality of the finite element model. In this embodiment, first, obtain the body-in-white CAD three-dimensional model, convert the file format of the body-in-white three-dimensional model into a common format.stp or.igs format (of course, in other embodiments, the common format can also be other common formats ), and then import the BIW 3D model file converted into a common format into hypermesh for finite element mesh division, and finally check the mesh quality of the divided finite element m...

Embodiment 2

[0146] This embodiment provides a body-in-white structure optimization design method based on weighted relative sensitivity, and a specific implementation case is carried out on the basis of Embodiment 1.

[0147] (1) Firstly, finite element modeling is carried out on the body-in-white by referring to the modeling standard of the enterprise, the modal and stiffness of the body-in-white are calculated, and the test is carried out to verify it, so as to ensure that the error between the simulation and test results is less than 10%, and a part of the body-in-white is obtained. The first-order torsional modal frequency is 28.17Hz, the first-order bending modal frequency is 43.50Hz, the bending stiffness is 15748.03N / mm, and the torsional stiffness is 14925.37N·m / °.

[0148] Since the frequency range of the engine idle state is 23.3-26.7Hz, the overall modal frequency of the body should be higher than the engine idle frequency by more than 2Hz, but because the first-order torsional ...

Embodiment 3

[0168]This embodiment provides a body-in-white structure optimization design device based on weighted relative sensitivity, the device includes a finite element model generation module, an analysis and verification module, a design variable screening module and an optimization design module.

[0169] The finite element model generation module is used to divide the finite element mesh of the 3D model of the body-in-white and establish the corresponding finite element model.

[0170] The analysis and verification module is used to calculate the mode and stiffness of each working condition in the finite element model, and conduct test verification on the body in white to obtain the error between the calculated value and the test value of the mode and stiffness. When the error is not less than a preset percentage, the analysis verification module adjusts the finite element model until the error is smaller than the preset percentage.

[0171] The design variable screening module is...

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Abstract

The invention discloses a body-in-white structure optimization design method and a body-in-white structure optimization design device. The body-in-white structure optimization design method comprisesthe following steps: establishing a finite element model of a body-in-white; calculating modality and rigidity of each working condition in the finite element model, carrying out test verification onthe body in white, and obtaining an error between a calculation value and a test value of the modality and the rigidity; adjusting the finite element model until the error is less than the preset percentage; according to the modality and the rigidity, a plurality of design variables for optimization design are screened out; and selecting a part of parameters in the body-in-white structure as a plurality of design variables according to the weighted relative sensitivity w of the body-in-white and the optimization cost of the body-in-white. A weighted relative sensitivity analysis method is adopted to select the design variable of the optimization design, the reliability optimization design is carried out on the white vehicle body determinacy optimization result, the white vehicle body structure meets the performance requirement, meanwhile, the vehicle body mass is reduced, and the system reliability is improved.

Description

technical field [0001] The invention relates to an optimization design method in the technical field of automobile structure design, in particular to a weighted relative sensitivity-based optimization design method for a body-in-white structure, and also relates to a weighted relative sensitivity-based optimization design device for a body-in-white structure. Background technique [0002] The optimal design of the body-in-white structure is an essential link in the process of automobile R&D and manufacturing. There are many body parts, and the mass accounts for about 30% of the whole vehicle, so the potential for lightweight body parts is great. However, there are many components in the body-in-white. From the perspective of economic cost and computer hardware capabilities, it is impossible to use the thickness of each component of the body-in-white as a design variable to optimize it. It is necessary to comprehensively select the influence on the optimized output response. ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/15
Inventor 姜平鲍娣陈无畏谢有浩赵林峰林艺龙
Owner HEFEI UNIV OF TECH
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