三向耦合非线性重型汽车建模及动力学分析  

Modeling and dynamic analysis of a non-linear heavy vehicle with three-directional coupled motions

作　　者：李韶华[1] 杨绍普[1] 陈立群[2] 

机构地区：[1]石家庄铁道大学机械工程学院,石家庄050043 [2]上海大学力学系,上海200444

出　　处：《振动与冲击》2014年第22期131-138,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(11072159);河北省自然科学基金(E201221002);教育部新世纪人才支持计划(NCET-13-0913)

摘　　要：分析汽车各向运动的耦合作用规律,建立23自由度三向耦合重型汽车整车模型,推导系统运动微分方程。将非线性Gim模型与垂向点接触轮胎模型结合描述三向非线性轮胎力,建立6个一阶常微分方程,以实时计算各车轮转速计算滑移率。通过数值积分计算车辆转向制动、匀速直线及方向盘角跃阶时的动态响应,并与传统的操纵稳定性模型、平顺性模型、虚拟样机模型及试验数据比较,验证所建模型的有效性。通过分析耦合作用对汽车响应影响表明,该耦合模型可同时研究汽车在复杂工况的平顺性、操纵稳定性及制动性。The coupling relationships of vehicle motions in different directions were analyzed.A heavy vehicle model of 23-DOF with coupled three directional motions was built and the equations of motion of the vehicle were deduced.The nonlinear tire forces in different directions were calculated by using the nonlinear Gim model together with the vertical single dot contact model.Six one-order ordinary differential equations were deduced to calculate the wheel rotating speed at real time and to get the slip ratios.Under the turning-braking combined condition,the uniform straight running condition and the steering wheel angle step condition,the dynamic responses of the vehicle were simulated respectively by numerical integration.The validity of the new vehicle model was verified by comparing the dynamic responses calculated with these by the traditional handling and stability model,the traditional ride comfort model,the functional virtual prototyping model and test data.The effects of coupling action on vehicle responses were also analyzed. The results show that the proposed three-directional coupled model is suitable to investigate simultaneously the ride comfort,handling stability and brake properties of vehicles in complicated driving conditions.

关 键 词：三向耦合 重型汽车 建模 非线性轮胎力 整车动力学 

分 类 号：U461.2[机械工程—车辆工程]