【摘要】 以某越野车非承载式刚性车架为研究对象，首先基于刚度与强度分析结果，选取关键连续体区域开展多轮局部拓扑优化；随后结合直接灵敏度与相对灵敏度分析方法，对设计变量进行系统筛选，并将车架各部件壁厚作为可变参数；在此基础上，依托HyperMesh平台，以质量最小化为目标，对筛选后的设计变量实施多工况尺寸优化，最终实现车架结构的轻量化设计。该研究有效融合了结构力学分析、灵敏度评估与参数优化技术，为越野车辆车架的高性能轻量化开发提供了可行路径。更多还原

【Abstract】 The paper takes the body-on-frame rigid frame of a off-road vehicle as the research object, first selects the key continuum regions to carry out multiple rounds of local topology optimization based on the results of stiffness and strength analysis. Then, it uses direct sensitivity and relative sensitivity analysis methods to screen design variables systematically,with the wall thicknesses of each frame component as variable parameters. On this basis, relying on the HyperMesh platform,with mass minimization as the objective, multi-condition size optimization is implemented on the screened design variables,ultimately achieving the lightweight design of the frame structure. This study effectively integrates structural mechanics analysis, sensitivity evaluation and parameter optimization techniques, providing a feasible path for the high-performance lightweight development of off-road vehicle frames.更多还原