汽车动力总成悬置支架的多目标拓扑优化

Multi-objective Topology Optimization for the Mount Bracket of Vehicle Powertrain

汽车动力总成悬置支架设计是一个静动态多性能指标的优化过程。为克服单目标拓扑优化的局限性,以静态多工况下刚度和动态特征值为性能指标,采用折衷规划法定义目标函数,构建多目标连续体结构拓扑优化数学模型,进行悬置支架多目标拓扑优化。依据拓扑优化结果并考虑制造工艺性等要求,对悬置支架进行详细设计。最后对支架设计模型进行强度校核、模态仿真分析和耐久性试验验证,结果表明,采用所提出的方法进行悬置支架的概念设计可行且有效。

The design of an automotive engine mount bracket is an optimization process of static and dynam-ic multi-performance indicators. In order to overcome the limitation of single objective topology optimization, a math-ematical model for multi-objective topology optimization of continuum structure is constructed first with static stiffness in multi-conditions and dynamic eigenvalues as performance indicators to define objective function by compromise programming,and a multi-objective topology optimization for engine mount bracket is conducted. Then according to the results of topology optimization with consideration of manufacturing process requirements,the detailed design of engine mount bracket is performed. Finally,strength check,modal analysis and durability test verification are car-ried out. The results demonstrate that the method adopted is feasible and effective for the concept design of engine mount bracket.