Abstract: Because of the large and complex structure of the metro car-body, its local modification will lead to a large number of rework in finite element modeling and analysis. Taking into account the modular manufacturing characteristics of the aluminum-alloy metro car-body, modal analysis of this model was performed based on the dynamic substructure method. Results of computation were compared with those from the conventional finite element method. It is shown that the finite element model can be quickly established and the accuracy of the solution can also be guaranteed with the use of dynamic substructure method.

Key words: vibration and wave, dynamic substructure, super element, component mode synthesis(CMS), aluminum alloy metro car-body, modularization

摘要： 地铁车辆尺寸大、结构复杂，车体结构的局部修改会导致有限元建模过程的大量返工并需要对分析过程重新计算。根据铝合金地铁车体模块化制造的特点，利用动态子结构方法完成车体计算模型的构建和动态特性的计算，并与一般有限元分析过程进行比较。结果表明，动态子结构方法不仅能够实现计算模型的快速建立而且能够保证良好的求解精度。

关键词: 振动与波, 动态子结构, 超单元, 模态综合法（CMS）, 地铁铝合金车体, 模块化