In order to accurately analyze the vibration characteristics and transfer rules of rail vehicles in the wide frequency domain,a scheme for operational transfer path analysis(OTPA)based on a dynamics simulation model of a flexible vehicle system was proposed.A dynamics model of a flexible vehicle system including flexible wheelsets,frame,and vehicle body,as well as a rigid body model with identical structural parameters was established.The vibration characteristics of the wheelset,frame,and vehicle body were studied from the perspective of time domain.The simulation results were compared with the measured data to explore the effect of flexible treatment on vehicle vibration.The attenuation law of vibration energy was obtained.Meanwhile,the vibration characteristics of the flexible vehicle system under the excitation of measured vertical irregularities of steel rails were investigated from the perspective of the frequency domain.The OTPA method was used to simulate and analyze the main transfer path of vertical vibration in the bottom-up vibration transfer process of the vehicle system from wheelset to frame and vehicle body under complex condition of vertical irregularities of steel rails combined with wheel polygon.Research results indicate that the flexible treatment method of the vehicle system has a significant impact on vehicle vibration.Compared with the rigid body model,the vibration accelerations of wheelsets,frame,and vehicle body in the flexible vehicle system model are closer to measured values in the mid-to-low frequency range.The maximum vibration amplitudes of axle box,frame,and vehicle body are 250-450,30-40,and 3-4 m·s-2,respectively.The vibration amplitude attenuates by an order of magnitude from the wheelsets to the frame and vehicle body.The sperling index of the flexible vehicle system model is greater than that of the rigid body model,and the trend becomes more obvious as the speed increases.The impact of a vehicle's flexible vibration on the operational performance increases with the increase in speed.Under complex working conditions,the vibration of the vehicle system is mainly transferred to the frame through a series of steel springs,and then transferred to the interior floor through air springs and traction rods.4 tabs,30 figs,32 refs.
rail transitflexible vehicle systemOPTAvertical irregularity of steel railwheel polygonrigid body modeltransfer path
维普
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