必威体育精装版自动原理论文.docxVIP

自动控制原理课程研究 —车辆悬架系统数学建模及时域分析 学院： 汽车与交通工程学院 班级： XXXXXXX 学号： XXXXXXX 姓名： XXXXXX【摘要】：悬架是汽车上的重要总成,其任务是传递作用在车轮和车架之间的力和力矩,缓冲由不平路面传给车架或车身的冲击力,并衰减由此引起的振动,以保证汽车能平顺行驶。但随着汽车的发展，人们对汽车的舒适性要求越来越高，即对悬架的要求也越来越高。如果降低弹簧的刚度，则车体加速度减少使平顺性变好，但同时会导致车体位移的增加。由此产生车体重心的变动将引起轮胎负荷变化的增加，对操纵稳定性产生不良影响；另一方面，增加弹簧刚度会提高操纵稳定性，但硬的弹簧将导致汽车对路面不平度很敏感，使平顺性降低。所以，理想的悬架应该在不同的使用条件下具有不同的弹簧刚度和减振器阻尼，既能满足平顺性要求又能满足操纵稳定性要求。因此，必须对悬架系统弹簧的硬度系数K和阻尼器阻尼系数Cs进行匹配研究，然后根据最佳弹簧硬度和阻尼匹配进行设计，保证车辆行驶安全的要求前提下，使车辆达到最佳减震效果。本课题将对弹簧系数K、阻尼系数Cs分别控制下进行时域分析并用MATLAB仿真绘制正弦输入下的系统输出响应。【关键词】 : 被动悬架 弹簧系数 阻尼系数 数学建模时域分析【Abstract】：The suspension fork is on the automobile important unit, its duty is transmits the function between the wheel and the frame strength and the moment of force, the cushion does not pass to the frame or the automobile body impulse by the level road surface, and weakens the vibration which causes from this, guaranteed the automobile can go smoothly .But along with automobile development, the people are more and more high to the automobile comfortable request, namely more and more is also high to the suspension fork request .If reduces the spring the rigidity, then the chassis acceleration reduction makes smoothness to improve, but simultaneously can cause the chassis displacement the increase.From this will have the chassis center of gravity change to cause the tire load change increase, to will operate the stability to produce affects not good; On the other hand, will increase the spring rigidity to be able to enhance the operation stability, but the hard spring will cause the automobile to be very sensitive to the road surface undulation, causes smoothness to reduce.Therefore, the ideal suspension fork should have the different spring rigidity and the shock absorber damping under the different exploitation conditions, both can satisfy the smooth request and to be able to satisfy the operation stability request.Therefore, must conducts the match research to suspension fork system spring coefficient of hardness K and attenuator da