【作者】 郭妍旭；

【导师】 张波；

【作者基本信息】 辽宁工学院 ， 机械电子工程， 2007， 硕士

【摘要】 空气弹簧作为汽车悬架中重要的承载部件,对于汽车行驶的平顺性、乘坐舒适性等都有着很重要的影响。而空气弹簧检测试验台作为一个典型的位置交流伺服系统,传统的PID控制并不能满足其控制的要求。究其原因主要是:一方面该系统作为一个非线性系统,其内部存在着滞环、非线性等特点,不能满足PID控制对控制对象精确数学模型的要求;另一方面交流伺服系统缺乏辅助设计手段,通常只凭经验进行设计;另外,控制策略及控制参数的取值与否一般只能在系统完成后,根据现场实际运行效果来判断,若不合理只能做局部的调整和修改,难以实现最优控制。针对以上的不足,本课题主要从控制策略入手,通过对空气弹簧工作原理和试验台结构的研究,使用MATLAB/SIMULINK来辅助分析设计控制系统。借助MATLAB软件提供的系统控制工具箱,运用模糊控制理论,建立模糊控制器对试验台控制的稳定性、快速跟踪性、控制参数的取值、PID参数的整定和优化进行了全面的仿真,并利用MATLAB对系统的被控对象(电机的电流控制器、速度控制器、位置控制器)进行分析和建模。通过仿真结果证明了模糊控制具有快速响应和较强的鲁棒性,控制精度高等特点,从而验证了模糊控制在空气弹簧检测试验台的应用要优越于其他的控制策略。更多还原

【Abstract】 The air-spring test bench has important influence on vehicle performances, such as stability of driving, comfort of riding and so on. The AC servo test bench is a test device of air-spring capability and it is developed according to the exterior characters of that. The conventional PID control can not attain the precision, because of the existence of characteristics of dead zone , lag circle and nonlinearity in the AC servo system. A fuzzy PID controller is designed based on scientific study of Fuzzy Control Theory and applied to the AC position servo system.Aimed at the practical problem in AC control field above described, this paper brought forward to apply a system analysis-design software namely MATLAB/SIMULINK, which is prevalent in control field, to design and analysis of the system. By means of the Control System Tools supplied by MATLAB, the paper analysis stability, dynamic performance and steady-state performance of the control system and compare the two-control theory such as PID and fuzzy control through simulation in Simulink all side. It has been establish their mathematical model by using with MATLAB function in this paper. At last by analyzing and emulating the method for the test bench, the characteristic of fast response and excellent robustness can be showed, and the superiority of the fuzzy control method is also proved.更多还原