Power Flow Transfer Characteristic And Vibration Reduction For Railway Vehicle Vibration Isolation Systems

With the increase of the vehicle speed,the vehicle vibration caused by the track excitation will increase,moreover in the high-speed vehicle,the underneath active equipment will cause the local vibration of the vehicle body,and further affect the performance of the vehicle system.Therefore,it is necessary to study the vibration transfer of the vehicle vibration isolation system and reduce the influence of track excitation and equipment excitation on the vibration of the vehicle system.Based on the theory of power flow,and from the viewpoint of vibration energy transfer,and combined with the theoretical derivation and numerical calculation,the effects of vibration isolation system parameters on the system power flow are analyzed and summarized.A multi-rigid body model of the vehicle system is established,and the power flow transfer characteristics of the system is derived.The influence of system parameters on the power flow transmission in the multi-rigid body model is studied.The results show that the reasonable primary and second suspension parameters can effectively reduce the power flow of the system,and the bogie frame mass has a great effort on the transmission of high frequency power flow.Considering the elasticity of the carbody,a coupled vibration model of the carbody and the underneath active suspension device is established.The power flow expressions of the carbody and the underneath active equipment are deduced using the four-pole parameters method.Through analyzing the power flow of the system,the effort law of the underneath active equipment on the vibration of the carbody is obtained.It is found that the smaller suspension stiffness can reduce the influence of equipment excitation on the power flow of the carbody,and change the elastic carbody structural parameters can significantly change the system power flow transfer curve.By analyzing the measured vibration data on the actual line,the magnitudes of the vibration acceleration at different speeds are compared.Based on the power flow theory,evaluating the vibration isolation effect of the active equipment suspension system at different speed is implemented by using the power flow transmission rate and the power flow gap flow,and the vibration transmission rules of the underneath active equipment and carbody are analyzed.