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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。
In order to study the coupling vibration characteristics between body and power pack, calculate the natural modes and low-order vibration modes of the vehicle body, a rigid-flexible coupled vibration model of urban rail transit vehicle with power package underneath the vehicle is established, Effect of Hanging Parameters on Vibration Characteristics of Car Body. The calculation results show that the first-order bending frequency of the vehicle body affects the vertical performance of the vehicle more than the second-order bending frequency. When the excitation frequency reaches 9.5 Hz and 16.5 Hz, it is respectively superposed with the first and second order bending frequencies of the vehicle body, and the stability index of the vehicle body rapidly deteriorates at this frequency , So in the vehicle design process should try to avoid the frequency of resonance.