Abstract：To slow down the vibration of automobile suspension for the car passing speed humps of expressway, the automobile suspension model and the speed humps-speed coupling incentive model were established. The root mean square value of acceleration in the vertical direction caused by the acceleration of vehicle suspension was taken as evaluation index, and the Simulink was used to simulate and analyze the vibration incentive characteristics for the automobile passing through speed humps at a certain speed. The speed humps of a downhill section of a fast road in Zhenjiang were selected and compared before and after optimization. The results show that when the speed limit is 80 km?h-1 with speed hump width of 1.0 m, the speed decline rate of mini-car is 14.3%. When other parameters remain unchanged with adjustment width of 1.4 m, the speed drop rate of small cars reaches 21.4% with resonance phenomenon for vehicle suspension. The optimized speed hump can significantly increase the speed limit effect and improve the driving comfort of driver and passenger.
2019, Vol. 40 
