基于综合灵敏度的转向节轻量化设计研究

LIGHTWEIGHT DESIGN OF STEERING KNUCKLE BASED ON COMPREHENSIVE SENSITIVITY

转向节轻量化设计过程中,由于随机变量过多,同时考虑多种因素时易造成优化结果欠佳。本文考虑随机参数变量对转向节应力与总体积的影响,提出综合灵敏度的概念。通过动力学仿真得到三种典型工况下转向节的承载,并由有限元分析确定极限工况并得到初始静力学及可靠性指标,运用综合灵敏度分析理论得到最终设计变量,最后通过建立数学模型完成轻量化设计。结果表明,运用综合灵敏度的轻量化设计方法,合理有效的减轻了转向节质量并保持较好的静力学及疲劳可靠性要求,具有工程应用背景。

In the process of designing lightweight of the steering knuckle,because of too many random variables and various factors,it is easy to result in poor optimization results. We consider the effect of the random parameter variable on stress and total volume and put forward the concept of comprehensive sensitivity. Through the dynamic simulation we get the steering knuckle bearing under three typical working conditions. By the finite element analysis,we obtain extreme load condition data and the initial static and reliability indicators. We use comprehensive sensitivity analysis theory to get the final design variables. Finally,we complete the lightweight design by establishing mathematical model. The results show that the lightweight design method based on comprehensive sensitivity can reduce steering knuckle weight and maintain good static and fatigue reliability effectively and can be applied in the engineering field.