骆翠芳，陈国强，孙晶晶

潍柴动力股份有限公司发动机技术研究院，山东潍坊261061

摘要：基于有限元分析方法对空压机支架结构设计进行验证，采用Abaqus软件对空压机支架进行模态分析，结果显示：支架安全系数较低，刚度不足；1阶模态频率与激振频率接近，易产生共振。结合拓扑优化方法对刚度不足处进行结构改进设计；对改进后结构进行强度及连接可靠性分析，均满足要求。采用Femfat分析软件对支架进行高周疲劳计算，其最小安全系数不满足限值要求，对支架进行加强筋增厚处理后满足疲劳强度要求。改进后的空压机支架已完成样机开发并通过耐久试验验证，表明优化方法有效。

关键词：空压机支架；有限元方法；优化设计

Abstract:The structural design of the air compressor bracket is verified based on the finite element analysis method, and the modal analysis of the air compressor bracket is carried out by using Abaqus software. The results show that the first mode frequency is close to the excitation frequency, easy to produce resonance. The structural topology optimization is carried out, and the direction of the reinforcement rib at the bottom of the bracket is changed. After the optimization, the mode of the bracket meets the requirements. The net strength and connection reliability analysis of the improved structure meet the requirements. The minimum safety factor does not meet the requirements of the limit value when the high cycle fatigue of the bracket is calculated by using the Femfat analysis software, and the fatigue strength requirement is satisfied after the bracket is thickened. The prototype of the improved air compressor bracket has been developed and verified by durability test, and the optimization method is feasible.

Keywords:air compressor bracket; finite element method; optimal design