【摘要】 采用滑模变结构控制时不可避免会产生抖振问题,尤其是对于那些变参数及具有不可测量持续扰动的系统,通过常规方法难以克服抖振对系统控制性能带来的不利影响。为此将模糊控制与滑模变结构控制相结合,设计了一种模糊变结控制器,既保持了变结构控制的鲁棒性及快速性,又能较好地消除抖振现象,并利用描述函数法分析了该控制系统的稳定性。最后通过一个具体的导弹变系数二阶控制系统的应用实例验证了该控制器的性能。更多还原

【Abstract】 Chattering is inevitable to sliding mode variable structure control (VSC). Common methods are not efficient to reduce chattering, especially for those systems with variable parameters or which are exposed to unmeasurable durative disturbance. For this reason a fuzzy variable structure controller (FVSC) is designed which combines the advantages of fuzzy control and VSC. The controller not only keeps good robustness and sensitivity, but also can efficiently reduce chattering. The stability of the FVSC system is analyzed by applying the method of describing function. Finally an example of missile control system with the second-order variable coefficient is give to test the performance of the controller.更多还原