【作者】 罗文水；

【导师】 谷正气；

【作者基本信息】 湖南大学 ， 车辆工程， 2007， 硕士

【摘要】 随着汽车的普及,交通事故也日趋频繁,汽车的安全性研究已是摆在汽车专家们面前的一个严峻的课题。人们对汽车的要求也越来越高,在获得良好的动力性和燃油经济性的同时,还要求获得良好的操纵稳定性和行驶平顺性。对于这些要求,只有通过对汽车系统动力学的深入研究才能实现。为尽快推出高性能的新车,全球各大汽车厂家纷纷引入了计算机虚拟样车技术,使得设计者在汽车设计阶段便能很好地了解该车的性能,并能根据需要,修改相关的零部件或性能参数,得到最优的整车性能。在多体系统动力学分析软件中,ADAMS是车辆动力学中应用最广,最为著名的一个软件。本文在ADAMS/CAR环境下建立了某跑车的135自由度整车多体系统开环模型,按照标准要求,以该模型为基础对稳态转向特性、瞬态转向特性、回正特性、直线制动、转弯制动等进行了仿真分析。并编制了驾驶员控制文件,对该车的蛇行性能、转向轻便性进行了仿真分析。通过对仿真结果的评价分析可知:该车具有较好的回正性能、蛇行性能、转向轻便性、直线制动以及转弯制动性能,但其稳态回转性能和瞬态转向性能一般。本文以整车质量、前轴轴荷、后横向稳定杆扭转刚度这3个参数作为优化设计参数,对整车多体系统进行了优化分析,优化后该车的转向特性得到了明显的改善。更多还原

【Abstract】 With the popularization of automobile, Traffic accident becomes more and more.The research of automobile security has turned into a very important task for vehicle experts. With the deeper understand of the automobile, the consumer have higher require to the quality, not only its dynamics and economics, but also handling and ride. More powerful technology and methods meet them, and they all based on betterly studing system dynamics of automobile.In ordering to improve the capability of automobile, more and more vehicle factorys around the world make use of virtual prototype technology. The applications of virtual prototype technology help the designers to betterly understand the characteristic of ride comfort, controllability, stability and brake performance, so that they can judge if the performances of the vehicle meet the requirements. And we can prove the performances of the vehicle through amending the capability parameters. The software ADAMS, which developed with multi-body system dynamics, is the most fashionable and authoritative software in the field of mechanical dynamics simulation.In this thesis, using the software ADAMS/CAR ,a 135 DOF multi-body system dynamics open loop control model was built. And according to the requests of standards, lots of simulation research of open loop control test, such as steady state cornering test, braking on curve test and so on, were carried on. Then simulation research of closed loop control test, such as slalom test and“8”form driving test, were carried on with the driver control document.Based on the simulation results, we can find that the car possess better returnability, braking performance and so on. But steady state cornering performance and transient response performance is not good. In this thesis, the multi-body system was optimized with three parameters of automobile amending. And the steering performance of automobile was improved obviously.更多还原