Study On Vibration Reduction Characteristics Of Air Sping Systems Of High Speed Passenger Cars

A dynamic model of air spring bogie with considering the leveling valve and d/p valve is set up in this paper. Through the numerical simulation by using SIMPACK combined with SIMULINK, the dynamic performance of high speed vehicle with air spring bogie is investigated. The influence of different leveling valve control methods on vehicle dynamics is compared. The effect of the main parameters of air spring and anti-roll bar stiffness on ride comfort and running safety is analyzed, and the suitable value ranges are determined. The matching problem of the orifice diameter of air spring and secondary vertical damping is studied, and the damping type of orifice plus vertical damper and their value range are determined.The simulation results for vehicle system with considering the leveling valve and d/p valve are more accurate than the results with simplified air spring model. The d/p valve normally does not act during curve negotiation, and also the leveling valve and its control methods have little effect on the vehicle dynamic performance. The 4-points control method is recommended to ensure the running performance of the high speed vehicle.The parameters of air spring have significant effect on the ride index, dynamic curving performance and safety. The parameter ranges are suggested as following:main capacity of air spring:60-70L; accessional capacity of air spring:80-100L; diameter of fixed orifice: 14-20mm; lateral stiffness:<0.2MN·m-1; vertical stiffness of emergency spring:<4MN·m-1.For 2-points leveling valve control method, the anti-roll bar should be mounted in order to increase the anti-roll ability. Except the roll motion, the anti-roll bar has less influence on the other motions of the vehicle.The diameter of fixed orifice and secondary vertical damper have less influence on the lateral ride comfort. The vertical ride quality and comfort are improved with the increase of orifice diameter. The use of secondary vertical damper restrains low-frequency vertical vibration, and improves the vertical ride index quality. In order to improve the vertical ride quality, the use of fixed orifice plus secondary vertical damper is suggested for air spring bogie. The orifice diameter is recommended as 14-22mm, and secondary vertical damper as 5-15kN·s·m-1.