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介绍了结构模态分析和稳定性分析的基本理论;利用I-deas分析软件建立某新型地铁铝合金车体详细的有限元模型,对车体结构进行模态和稳定性仿真计算,通过模态分析得到了两种工况下车体的前六阶固有频率及其相应的振型;通过稳定性分析得到了车体结构发生屈曲失稳时的临界载荷和失稳部位。分析结果表明该铝合金车体满足动态设计要求,且在各种工况条件下结构稳定性良好。
The basic theory of structural modal analysis and stability analysis is introduced. I-deas analysis software is used to establish a detailed finite element model of a new type of metro aluminum alloy car body. The modal and stability simulation of car body structure is carried out. The first six natural frequencies and their corresponding modes are obtained under two different working conditions. The critical loads and the destabilized parts of the car body under buckling failure are obtained by the stability analysis. The analysis results show that the aluminum alloy body meets the dynamic design requirements and has good structural stability under various working conditions.