中文摘要：

为研究车体与动力包结构耦合振动特性,计算车体固有模态以及低阶振型,建立了包含车下吊挂动力包的城轨车辆刚柔耦合振动模型,优化分析了动力包结构吊挂参数对车体振动特性的影响。计算结果表明：车体一阶弯曲频率对车辆垂向性能的影响要大于二阶弯曲频率。将动力包的振动以周期激励形式输入模型,当激振频率达到9.5 Hz和16.5 Hz时分别与车体的一阶和二阶弯曲频率相叠加,在此频率下车体的平稳性指标迅速恶化,因此在车辆设计过程中应尽量避免发生该频率下共振。

英文摘要：

In order to study the coupling vibration characteristics between the carbody and power package structure and calculate the carbody inherent ti-equency and low-order type, the urban rail vehicles coupling vibration model with power pack structure hanging under the carbody was derived, and the influence of hanging parameters on character of carbody vibration was analyzed. The results showed that： the influence of the first order vertical bending frequency of carbody on vertical stability was larger than the second order; when the vibration of the power package was input to model as periodically excited, and the excitation frequency reached 9.5 Hz or 16.5 Hz,which would superimpose with the first and second order benging frequency range, the ride index rapidly deteriorated. Therefore, vehicle design should try to avoid these resonance frequencies.