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| 复杂工程约束下基于NSGA-Ⅲ的车身梁截面优化设计 |
| Optimal Design of Car Body Beam Section Based on NSGA-Ⅲ under Complex Engineering Constraints |
| 投稿时间：2020-12-23 修订日期：2021-02-20 |
| DOI： |
| 中文关键词: 薄壁梁 概念设计 结构优化 NSGA-Ⅲ |
| 英文关键词:Thin-walled beam Conceptual Design Structure optimization NSGA-Ⅲ |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要: |
| 在汽车概念设计阶段，车身常由薄壁梁简化而成，其截面对轿车白车身刚度有直接影响。多室的薄壁梁截面极其复杂，在设计过程中不仅需考虑其力学性能，还需符合制造加工过程的各种工艺约束。本文基于薄壁梁截面设计中的装配性与制造性等实际工程约束，提出一种梁截面形状控制方法以兼容多种工程约束。定义了梁截面多目标优化模型，以基于参考点的遗传算法NSGA-Ⅲ作为高维多目标优化问题算法，实现了相应的软件模块、对截面惯性矩、扭转常量等参数进行优化。最终通过算例测试证明此方法的有效性。 |
| 英文摘要: |
| Abstract: In the car concept design stage, the car body is often simplified by thin-walled beams, and its section has a direct effect on the rigidity of the car body in white. The cross-section of multi-chamber thin-walled beams is extremely complex. In the design process, it is not only necessary to consider its mechanical properties, but also to meet various constraints of the manufacturing process. This paper fully considers the engineering constraints such as assemblability and manufacturability in the design of the car body section, and proposes a special beam section shape control method to be compatible with multiple engineering constraints. A cross-section multi-objective optimization model is defined, and NSGA-Ⅲis used as a high-dimensional multi-objective optimization problem algorithm to optimize parameters such as the section moment of inertia and torsion constant. Based on this method, the corresponding software modules are implemented. Finally, an example is used to prove the effectiveness of the method. |
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