Adaptability study of yaw damper with through piston rod in railway vehicles
Since the piston rod occupies the same cross-sectional area in the upper and lower operating chambers of the piston,and the parameters of the rebound damping valve and compression damping valve on the piston are consistent.Therefore,the flow of the hydraulic oil in the operating chambers through the damping valves is the same during the rebound stroke and compression stroke,thereby generating the same damping force.The yaw damper with through piston rod has highly symmetrical dynamic and static performance,which can compensate for the poor symmetry of the static performance of yaw damper with oil double orientation flowing and the dynamic performance of yaw damper with oil single orientation flowing.Firstly,based on the operating principles and structural parameters of the yaw damper with through piston rod and the yaw damper with oil double orientation flowing and the yaw damper with oil single orientation flowing,three numerical simulation models of the yaw dampers were respectively established.Then the models were validated by the yaw damper performance tests.The dynamic performance symmetry and the static performance symmetry of the three types of the yaw dampers were compared by simulation.Finally,the dynamic co-simulation of the vehicle model and the yaw damper models was carried out using Simulink,comparing the curve stability of the railway vehicle equipped with the yaw damper with through piston rod and the yaw damper with oil double orientation flowing under low wheel-rail equivalent conicity and on a curved track.The straight-line stability of the railway vehicle equipped with the yaw damper with through piston rod and the yaw damper with oil single orientation flowing under high wheel-rail equivalent conicity and on a straight track.The research results are shown as follows.The dynamic performance symmetry and the static performance symmetry of the yaw damper with through piston rod are excellent and superior to those of the yaw damper with oil double orientation flowing and the yaw damper with oil single orientation flowing.Under low wheel-rail equivalent conicity and on curved track conditions,the vehicle equipped with the yaw damper with through piston rod compared with the yaw damper with oil double orientation flowing can increase the nonlinear critical speed,further suppressing the bogie's yaw vibration at about 1.2 Hz,and improving the vehicle's curve stability.Under high wheel-rail equivalent conicity and on straight track conditions,the vehicle equipped with the yaw damper with through piston rod compared with the yaw damper with oil single orientation flowing can increase the nonlinear critical speed,further significantly suppressing the bogie's yaw vibration below 8 Hz,and improving the vehicle's straight-line stability.The research results can provide a theoretical basis for the advantages of the adaptability of the yaw damper with through piston rod in railway vehicles.
yaw damper with through piston rodnumerical simulation modelperformance symmetryco-simulationvehicle stability
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