高速列车设备舱底板的振动特性研究

为了优化设备舱底板的振动疲劳特性,建立了刚柔耦合多体动力学模型,分析了在武广谱载荷谱的线路条件激励下,底板关键位置的振动和车速的关系。研究发现,车辆设备舱底板的振动总体趋势是随着速度的增加而增加,但是在250km/h的时候,纵向振动幅值会比300km/h的要大。根据动力学仿真结果提取出载荷的大小,进行了有限元强度分析,得到了底板的最大应力和开孔位置的最大应力。滚动台试验数据和仿真结果一致,验证了模型的正确性。最后对底板进行了优化,加厚设备舱底板的厚度。对比发现,优化后的整体最大应力由8.78 MPa减小到4.79MPa,开孔处的最大应力由1.65MPa减小到0.95MPa,底板的强度性能得到了大幅度提高。

Vibration Characteristics of Equipment Cabin Bottom PlaTe

In order to optimize the vibration fatigue characteristics of the equipment cabin bottom plate, a rigid-flexible coupled multi-body dynamic model is established, and the relationship between the vibration of the key position of the floor and the vehicle speed is analyzed under the Wuguang spectrum. It is found that the overall vibration of vehicle equipment cabin bottom plate is increasing with the speed, but at 250km/h, the longitudinal acceleration amplitude is larger than 300km/h. Then according to the dynamic simulation results, the loads is extracted and the finite element strength analysis is performed. The maximum stress of the whole bottom plate and the maximum stress around the hole are obtained. The rolling table test data is consistent with the simulation results. Finally, the bottom plate is optimized to thicken the plate thickness. By comparison, the overall maximum stress after optimization is reduced from 8.78 MPa to 4.79 MPa, and the maximum stress around the hole is reduced from 1.65 MPa to 0.95 MPa. The strength performance of the bottom plate has been greatly improved.