整备状态下的轨道交通车辆车体模态计算分析

推导了多自由度刚体振动系统振动频率和特征向量的解析方法,研究了轨道交通车辆车体设备悬挂方式及其垂向悬挂刚度与车体系统振动频率和车体各阶振幅之间的关系。以某轨道交通车辆车体模态分析为例,对车体模态分析过程中悬挂设备的模拟方法、车体内装和设备的刚度,以及乘客质量对车体一阶垂弯和扭转频率的影响进行了深入分析和试验对比。研究结果表明,设备悬挂方式和悬挂刚度的选择对车体频率有非常显著的影响;与试验相比,考虑设备悬挂刚度、内装和设备自身刚度时对车体主要振动模态有显著提升,应在车体结构设计时予以注意;乘客质量对车体主要振动模态频率几乎没有影响。

Carbody Modal Analysis for Rail Transit Vehicle under Preparation Conditions

The analytic method of vibration frequency and characteristic vector for multi-degree of freedom rigid body system is deduced,and the relationship between equipment suspension style,vertical suspension stiffness,carbody vibration frequency and vibration amplitude are studied.A railway vehicle carbody modal is taken as an example,the influence of the simulation method of equipment suspension,stiffness of car interior and equipment decoration,as well as the passenger weight to the first order vertical bending and torsion frequencies are analyzed in depth,and compared with test result.This research shows that the selection of equipment suspension style and suspension stiffness has significant effect on carbody frequency.By comparing with the test result,and considering of the equipment suspension stiffness,car interior and equipment decoration stiffness,the main vibration modal stiffness of carbody should have obvious improvement during the carbody structure design,while the passenger weight has little impact on carbody main vibration modal frequency.