中文摘要：

本文中基于原有副车架结构,通过材料替换和结构改进,并充分考虑镁合金的加工工艺,改进设计出新型镁合金副车架。首先,对原有结构进行镁合金材料替换,进行了正常载荷、疲劳载荷和过载工况下的强度分析,计算得到副车架各阶频率与振型;接着结合副车架动刚度特性,对镁合金副车架结构进行了改进设计,在确保满足使用要求的前提下,副车架质量减轻50%。本文中采用的综合强度、模态与动刚度分析的设计方法,可为汽车其它承载结构件的设计提供参考。

英文摘要：

In this paper,based on the original structure of subframe and through material substitution and structural modification,with consideration of the manufacturing technology of magnesium alloy,a nvel magnesium alloy subframe is redesigned. Firstly the material of original structure is substituted by magnesium alloy and a strength analysis is conducted on subframe under the conditions of normal load,fatigue load and overload to calculate the frequencies and vibration modes of different orders. Then combined with the dynamic stiffness characteristics of subframe,the structure of magnesium alloy subframe is redesigned. As a result the mass reduction rate of subframe reaches more than 50%. The design method of comprehensive strength,modal and dynamic stiffnes analyses adopted in the paper provides a reference for the design of other load-bearing components of vehicles.