High-speed Vehicle Stability. Side Of The Wind Environment, Research And Analysis

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 paper, various evaluation index for handling and stability of vehicle were introduced, a 18 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 4 kinds of unsteady wind has been simulated with some simulation results and a few analysis have been given.For the performance of closed-loop system can represent the vehicle characters very well, a driver-vehicle-road closed-loop model based on the preview-follower method with PID driver model and 2 DOF vehicle model has been created and some simulations have been done. The above simulation results were hi agreement with the reference.