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Development of Multi-objective Optimization Module in Vehicle Body Structure Concept Design System

Author: LiuBaoYue
Tutor: HouWenBin
School: Dalian University of Technology
Course: Vehicle Engineering
Keywords: Body in white Conceptual design Multi-objective optimization Secondary development
CLC: U463.82
Type: Master's thesis
Year: 2011
Downloads: 153
Quote: 1
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Abstract


The modern body design, including conceptual design and detailed design of the two phases in the conceptual design stage, to estimate and optimize the structure and properties of the body repeatedly revised body design can avoid late. In the car body design, the the body static structure stiffness (flexural rigidity and torsional rigidity) and dynamic low modes (overall bending modal frequency and the overall torsional vibration mode frequency) is an important structural performance evaluation index, in order to achieve the body of the optimization design, to achieve a lightweight body and reduce costs, the need to optimize the design of the body performance. Optimization design is just one indicator of the optimization of a single target, it is difficult to meet the needs of the actual body design optimal structural parameters, hence the need for multiple structural performance optimization as a multi-objective optimization objectives. In this paper, a mathematical model, based on the body concept of the structure of multi-objective optimization by means of secondary development of in UG NX5.0 CAD platform programming and interface design, development and build of the design system based on the concept of body structure VCD-ICAE (Vehicle Concept Design Intelligent CAE) multi-objective optimization module. The module can be fast parametric geometry model and finite element model of the car body in white, meet the quality requirements of constraints, the thickness of the body panels and cross-sectional shape as design variables to achieve more structural rigidity and low order modes indicators multi-objective optimization analysis to improve the structural performance of the overall concept of body, to help designers get the optimal design parameters and model design. The first chapter describes the significance of the important role of the body conceptual design stage and at this stage of the body conceptual model for multi-objective optimization design. The second chapter describes the body structure performance analysis theory and multi-objective optimization the module objective function mathematical model establishing. The third chapter introduces the key technology and main functions of the body conceptual design system (VCD-ICAE). Chapter by using UG / OPEN secondary development tools the UG NX5.0 CAD software secondary development, VCD-ICAE-based system development to build a multi-objective optimization module. Chapter, based on a detailed model of the body structure of a specific model, the establishment of a body panel structure conceptual model and beam structure conceptual model, conceptual model of the structure of the body panels stiffness multi-objective optimization design and the use of a detailed model of the body structure benchmarking tests to prove the effectiveness and practicality of the VCD-ICAE system of multi-objective optimization module. Three types of multi-objective optimization design of the the body beam structure concept model to meet quality constraints, improve the body structure of multiple performance indicators, the guiding role of the optimized design results improved with a detailed model of the body. In addition, Chapter VI of this article also detailed model of the body structure Windshield hole deformation optimize the design to meet the design requirements of allowable limits, to improve the performance of the stiffness of the body structure so that each hole deformation.

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CLC: > Transportation > Road transport > Automotive Engineering > Automotive structural components > Cab and body > Car body
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