Research On High-Speed Vehicle Steering Stability In Side-Wind Based On Multi-Body Dynamics

With the increasing of vehicle speed, the effect of the aerodynamics on the vehicle handling and stability becomes more and more important. The experiments cost a lot of money and time. The developing process and experiment times of a new automobile could be reduced by computer simulation. So the research of the high-speed vehicle side-wind stability with computer simulation is significantly helpful. To study the dynamics of vehicle, the key point is to build a accurate model. With the great improvement of the computer technique and the maturation of the multi-body dynamics, the multi-DOF of the automobile model was presented and the simulation results were more accurate.In this thesis, a 17 DOF vehicle model in the cross-wind, which based on the high-speed aerodynamics characters and non-linear tire model, was built, the performance of high-speed vehicle running in straight line in the crosswind have been simulated with some results and a few analyses of them have been given. Using the ADAMS, a vehicle dynamic model of multi-rigid bodies including suspension system, steering system and power system was built. The performance of high-speed vehicle which turning during the crosswind which including various C.P., velocity and vehicle style has been simulated with some simulation results and a few analysis have been given.Based on the simulation results, the vehicle stability in side-wind has been improved, present the way on aerodynamic parameter, automotive structural parameter and vehicle style to improve vehicle stability in side-wind.