汽车横风下的动力学仿真分析及横摆稳定性研究

Study on the Influence of Different Tire Pressure on Vertical Acceleration of Vehicle

目前随着汽车行业的发展,对于汽车的稳定性能要求也越来越高。本论文以某款车型为研究对象,探讨在高速的行驶的情况下,汽车结构参数、底盘参数等20个参数对于汽车横风稳定性的影响。首先利用CFD软件计算车辆气动力系数,并通过Carsim软件建立整车动力学仿真模型,将气动力系数导入Carsim气动力学模型中。在专家工程师所设定可接受程度的参数进行动力学仿真分析,并将汽车的横摆角速度作为车辆的稳定性能指标评估。仿真结果表明,汽车前、后载荷对于横摆稳定性能影响最大,针对此款后驱车辆,前/后载荷增大,横摆稳定性能越好;风压中心位于质心或质心稍微靠后的位置,横摆角速度较小,具有较好横摆性能。

At present,with the development of the automobile industry,the requirements for the stability of the car are getting higher and higher.In this paper,a car is taken as the research object,and the influence of 20 parameters such as vehicle structure parameters and chassis parameters on the crosswind stability of the vehicle is discussed under the condition of highly speed driving.Firstly,the aerodynamic coefficient of the vehicle is calculated by CFD software,and the vehicle dynamics simulation model is established by Carsim software,and the aerodynamic coefficient is imported into the Carsim aerodynamic model.The dynamic simulation analysis is carried out with the acceptable parameters set by the expert engineer,and the yaw rate of the vehicle is used as the stability performance index of the vehicle.The simulation results show that the front and rear loads of the vehicle have the greatest influence on the yaw stability performance.For this rear-drive vehicle,the yaw stability performance is better when the front/rear loads increase.The wind pressure center is located at the center of mass or the center of mass slightly back,and the yaw rate is small,which has good yaw performance.