基于强度拓扑优化的乘用车轮毂轻量化设计

Lightweight Design of a Passenger Car Wheel Hub Based on Strength-Based Topology Optimization Method

提出使用考虑强度的拓扑优化方法对某乘用车轮毂进行结构优化,在提高结构强度的同时,降低其总质量。首先,根据原设计确定设计空间,使用P范数建立全局应力函数并将其作为优化的目标函数,以体积分数为约束函数,对轮毂进行拓扑优化。基于拓扑优化结果,重新设计轮毂,分别建立原设计和优化后轮毂的有限元模型,并对比其结构性能。结果表明,与原设计相比,优化后的设计方案应力分布更均匀,最大von Mises应力下降11.4%,总质量下降4.5%。本文使用的考虑强度拓扑优化方法可为设计强度更好更轻质的轮毂结构提供参考。

A strength-based topology optimization method is proposed for the design of a passenger car wheel hub.The method aims to improve the strength of the wheel hub and reduce its total mass simultaneously.Firstly,the design space is determined based on the original design.The topology optimization problem is to minimize the global stress measure constructed based on P-norm function considering the volume constraint.Subsequently,a new wheel hub is designed based on the topology optimization result.The finite element models of the original and the new wheel hub are respectively established and analyzed.The results show that,compared with the original design,the new wheel hub has a more uniform stress distribution.The maximal von Mises stress and the total mass are reduced by 11.4%and 4.5%,respectively.The wheel hub determined by the proposed method has better mechanical performance.The presented strength-based topology optimization method can provide useful reference for the lightweight wheel hub.