平台架构概念设计阶段车身结构优化方法

针对平台架构概念设计阶段的车身结构优化问题，创造性地提出一种新的方法，包含3个阶段：第1阶段为考虑真实碰撞载荷，利用多模型优化法（MMO）进行综合工况下的车身全局拓扑优化，解读不同的传力路径；第2阶段为考虑平台架构高低姿态车型，利用SFE CONCEPT软件建立不同传力路径下的车身参数化模型，进行不同动力下的结构对比分析及优化，确定车身传力路径形式；第3阶段为基于近似模型法的车身截面优化和基于等效静态载荷（ESL）法的车身料厚优化，并将优化方案代入高低姿态车型，在不同动力类型下进行验证及优化，保证车身结构处于平台架构目标性能带宽下。在某车企的平台架构概念设计阶段，利用该方法对车身结构进行了优化，验证了该方法的工程可实施性。

Optimization method of vehicle body structure in conceptual design stage of platform architecture

To optimize vehicle body structure in the conceptual design stage of platform architecture, a new method was proposed. The method includes three stages. In the first stage, considering the real collision load, the multi-model optimization method was used to carry out the global topology optimization under the comprehensive working condition, and the different force transmission paths were interpreted. In the second stage, considering the high and low vehicles of the platform architecture, the body parameter models of different transmission paths were established using SFE CONCEPT. Comparative analysis and optimization were conducted under different power types to determine the form of transmission path of the platform architecture. In the third stage, the approximate model method was adopted to optimize the body section and the equivalent static load method was adopted to optimize the body material thickness, and the optimization scheme was put into different vehicle and power types for verification and optimization, so as to ensure that the body structure was under the target performance bandwidth of platform architecture. In the conceptual design stage of the platform architecture of an automobile enterprise, the proposed method was used to optimize the body structure, and the engineering feasibility of this method was verified.