Simulation Of Vehicle Ride Comfort And Optimization Of Suspension Parameters

Vehicle ride comfort is one of the most important factors, which influence passenger's comfort. At the same time, excellent vehicle ride comfort has a great advantage in the fierce market competition. Therefore the study to improve vehicle ride performance is attached more and more attention. With the development of science and technology, the dynamics analysis software is applied in the design, manufacture and etc of vehicle.First, in this paper, a multi-body dynamic model is established by means of ADAMS, which includes suspensions, steering system, person-chair system, tires and road. Second, basing on the theory of harmony superposition and the road format of ADAMS, one software to produce random roads has been developed. Third, simulations of the model under stochastic road input and pulse input are carried out successfully. And the affect of the vehicle parameters, such as the stiffness and damper of the suspension and the tires, is analyzed. Last making use of test optimization, vehicle ride comfort is executed.The stochastic road is used as the input of the system. The changing rule of vertical acceleration of person-chair system is used as the output of the system. The results show that the higher the speed of the vehicle is or the worse the road condition is, the greater the vibration response of the person-chair system is. The results of the simulation pulse input reveal that the higher the speed of the vehicle is, the the greater the vibration response of the person-chair system is.Considering the stiffness and damper of the suspension as design variables and regarding vertical acceleration of person-chair system as target value, the optimization design of vehicle ride comfort is executed. The results show that the vibration response of the model after optimization is lower than that of the former. Therefore the ride comfort of the vehicle has been developed.Basing on the application of virtual technology, the vehicle ride comfort performance is simulated on the computer. It is significant to improve the vehicle ride comfort performance, cut down the design and manufacture cost and shorten the time to design the new vehicle.