| Ride is one of the prime performances of modern vehicle. Now, with the development of heavy tractor, how to improve vehicle ride has been paid more and more attention. With the wide application of the cab suspension system, particularly the application of the air suspension system, it is even more important to select the suspension parameters. Therefore, selecting the appropriate parameters of cab suspension system can effectively improve vehicle ride.Firstly, a 6-DOF half-car model is established by using MATALAB in this dissertation. It includes full-floating air spring suspension, full floating coil spring suspension, semi-floating air spring suspension and so on. Three kinds of effect of vehicle ride are carried out through the contest of different suspensions ways. And then, the matching analysis of the suspension parameters is carried out.Secondly, a whole multi-body model is established by using ADAMS in this dissertation. It includes front suspension, rear suspension, the steering system, chassis, air spring, leaf spring and so on. Under different speeds, series of simulation analyses of vehicle ride are carried out. Compared with the experimental values of the real vehicle, we can make sure the validity of the multi-body model.Thirdly, in this dissertation, the Design of Experiment(DOE)technology and orthogonal test method are described. With the method of relating DOE technology and orthogonal test in ADAMS/Insight, the optimal design of full-vehicle cab air spring suspension parameters(stiffness and damper)is studied, and an optimal design program was also brought out. At last, a simulation with the modified full vehicle model is processed and the results show that the optimized air suspension system can improve ride of the vehicle. The objective of the study was reached.
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