Coupled dynamic model of rack vehicle-track(rack)system and basic vibration characteristics
To study the dynamic characteristics of the rack vehicle-track(rack)system,based on the vehicle-track coupled dynamics theory and gear dynamics principle,a spatially coupled dynamic model of the rack vehicle-track(rack)system considering the nonlinear meshing behavior of the gear-rack and nonlinear contact characteristics of the wheel-rail is established.The effectiveness of the model is verified by the engineering line dynamics test.The basic vibration characteristics of the rack vehicle-track(rack)system and the influence mechanism of track random irregularity on the dynamic meshing behavior of the gear-rack system are investigated on this premise.The results demonstrate that the dynamic model of the rack vehicle-track(rack)system established in this paper has good accuracy and reliability.The random irregularity excitation has little effect on the vertical and longitudinal vibrations of the gear-rack system,but it has a substantial effect on the lateral vibration.The gear-rack system is less sensitive to vertical and roll irregularities,while the irregularities of the lateral and gauge make the gear-rack system unstable.Therefore,it is advised to increase the stability of the gear-rack system by reducing the transverse irregularity of the track to ensure the safe and stable operation of the rack vehicle.
rack railwayvehicle dynamicswheel-rail dynamic contactgear dynamicstrack irregularitygear-rack system stability
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