Research On Vibration Of The Tamping Vehicle Cab Based On Rigid-Flexible Coupling

In order to adapt to the development of high speed, heavy haul and the track structure heavy of the railway, the railway department of all over the world have used large track maintenance machine, in the railway construction, repair and maintenance mechanization of the whole operation, tamping vehicle workload is the largest, and it plays a decisive role in the quality of track. But as for Chinese railway rapid development, the running velocity of tamping vehicle has been improved, with the special structure of carbody so that its stiffness is smaller, when the vehicle on the track with a high-speed, it will increase the excitation frequency between the wheel and rail, which lead to the generation of high frequency vibration, and it will be transferred to the carbody through the bogie, which may cause severe structure vibration of carbody, the cab is rigid connection on the carbody in the past, so the cab will absorb the vibration directly, then worsen the vibration of cab. So it is necessary to research the influence of the carbody elastic vibration on the tamping vehicle dynamic performance, And through the use of vibration damping device between the cab and carbody to attenuate the vibration of the cab so that to achieve damping effect.This paper bases on finite element analysis method and multibody system dynamics theory. Rigid flexible coupled vehicle system dynamic models were built up by ANSYS and SIMPACK corresponding, and the carbody were considered as flexible bodies in the models, then analyze dynamic response of the tamping vehicle. Setting the two models to be under the same condition, simulate and calculate their dynamic performance indexes to analysis the differences between them owing to the carbody flexibility. The results show that the vibration displacement and acceleration of elastic vehicle larger than the vibration displacement and acceleration of rigid vehicle especially in the high frequency range. It also indicates that the carbody flexibility can lower the vehicle’s critical speed and the vehicle’s running stability. The maximum acceleration and the vehicle’s riding index of cab is larger than the Multi-rigid-body vehicle system, and the vehicle’s safety index is also increase. It indicates that the tamping vehicle dynamic performance can be influenced by the carbody flexibility.Secondly, the vehicle system dynamic model is established with cab’s vibration damping device, and then, based on a research of the suspension parameters of the cab’s vibration damping device which may be influence on the vehicle riding quality, in order to select the reasonable stiffness of the cab’s vibration damping device of ideal value range.Finally, analysis of the vibration damping device effect on vehicle’s riding index. The results show that the reasonable selection of vibration damping device parameters can improve vehicle’s riding index effectively and the tamping vehicle cab’s ride comfort.