A lightweight forward design method and system for automobile structure based on multiple performance constraints

A technology of automobile structure and design method, which is applied in the field of automobile CAE simulation, can solve the problems of lack of systematic and overall design methods, and achieve the effect of improving design efficiency, shortening design cycle, and improving the level of forward development

Active Publication Date: 2018-12-21
CHONGQING CHANGAN AUTOMOBILE CO LTD
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AI Technical Summary

Problems solved by technology

Although in each subsystem design project, advanced design methods and optimization methods can be used to achieve the "best" performance of each subsystem, however, due to failure to fully consider the coupling, constraints and synergistic effects between performances, the Such a design method lacks systematic and overall

Method used

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  • A lightweight forward design method and system for automobile structure based on multiple performance constraints
  • A lightweight forward design method and system for automobile structure based on multiple performance constraints
  • A lightweight forward design method and system for automobile structure based on multiple performance constraints

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Experimental program
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Embodiment Construction

[0041] The flow process that the inventive method realizes is as figure 1 Shown:

[0042] Step 1: Build a CAE simulation analysis model

[0043] Build the finite element analysis model of the body structure, and carry out the simulation analysis of the body performance.

[0044] Step 2: Topology Optimization

[0045] Using topology optimization technology, taking the bending / torsional stiffness performance of the car body as the constrained working condition, the material distribution in the design area is obtained, and the typical force transmission path of the automobile structure is identified;

[0046] Step 3: Sensitivity Analysis

[0047] Use sensitivity analysis technology to carry out strain energy analysis and material thickness sensitivity analysis respectively to find the weak link and critical design area of ​​the car body;

[0048] Step 4: Shape Ribbing / Size Optimization

[0049] Perform morphology optimization, determine the optimal structural morphology sche...

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Abstract

A lightweight forward design method and system of automobile structure based on multi-performance constraints is disclosed. The finite element analysis model of automobile body structure is established by using finite element modeling technology. The typical force transfer path of automobile structure is identified by using topology optimization technology and the bending/torsional rigidity performance of automobile body is taken as constrained working condition, and lightweight design in conceptual stage is carried out. Then the strain energy analysis and the material thickness sensitivity analysis are carried out by using the sensitivity analysis technology, and the weak links and the critical design area of the vehicle body are found. Topography optimization is used to improve vehicle performance; Finally, based on business integration optimization software, The multi-performance target of automobile body is analyzed by integrated simulation, and the correlation between design parameters and performance, performance and performance is studied by using DOE sampling and data mining technology, and then the lightweight design of automobile body structure considering multi-disciplinary performance is carried out, which reduces the quality of automobile body structure, improves product performance, shortens R D and manufacturing cycle, and saves cost.

Description

technical field [0001] The invention belongs to the technical field of automobile CAE simulation, and in particular relates to a lightweight design method for automobile structures. Background technique [0002] According to statistics, for every 10% reduction in the total mass of a car, the fuel consumption can be reduced by 6% to 8%. It can be seen that the light weight of the car structure has very positive significance for saving energy and reducing exhaust emissions. The automotive design process involves multiple disciplines such as NVH, stiffness, strength fatigue, and collision. It is necessary to comprehensively weigh various performance indicators among disciplines and carry out optimal design with multi-objective and multi-performance constraints. With the continuous improvement of the research and development level of domestic OEMs, the traditional design method based on reference cars can no longer fully meet the market demand of shortening the research and deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/15Y02T10/40
Inventor 李学亮彭磊许春铁王卓徐孝坤苏永雷
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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