转向节直接影响汽车的操作稳定性和行驶安全性，为使转向节在实现轻量化的同时满足汽车动力学要求，运用SIMP （solid isotropic material with punishment）密度函数插值模型以及带权重的折衷优化法定义综合目标函数，对某太阳能赛车转向节进行多目标拓扑优化，使其一阶振动频率和静态工况下的刚度达到综合最优值。优化后该转向节的一阶振动频率提高76.87%，静态工况下的刚度提高90.25%，质量减轻44.47%，轻量化效果显著。

Steering knuckle has a direct influence on the vehicle's operating stability and driving safety. In order to meet the requirements of lightweight of steering knuckle and automobile dynamics simultaneously, interpolation model of SIMP(solid isotropic material with punishment) density function and weighted compromise optimization method are applied to define synthesis objective function and carry out multi-objective topology optimization of a solar car's steering knuckle. The purpose of the optimization is to make the first order vibration frequency and the stiffness of the static working condition reach the comprehensive optimum value. After optimization, the first order vibration frequency of the steering knuckle is increased by 76.87%, the stiffness under the static working condition is increased by 90.25%, the mass is reduced by 44.47%, and the effect of lightweight is remarkable.

TH122

中央高校基本科研业务费科研专项资助项目（CDJZR14115501）。