改善闭环系统性能的方法  

Methods of Improving the Performance of Closed Loop System

作　　者：王勇[1] 张新政[1] 张荣明[1] 

机构地区：[1]广东工业大学自动化学院

出　　处：《广东工业大学学报》2005年第3期59-63,共5页Journal of Guangdong University of Technology

基　　金：国家自然科学基金(60274030);国际合作项目(2003C50302);广东省科技攻关项目(C31801)

摘　　要：提出I-变速趋近律和m-变速趋近律.利用该趋近律方法,设计了基于离散时间线性定常系统的变结构控制(VSC).系统在该变结构控制的作用下,趋近运动和滑动运动的速度是可变的;保证了趋近模态和滑动模态的品质,并能削弱闭环系统的抖振,从而改善了闭环系统的品质.通过实例仿真,验证了该设计方法是有效和可行的.In this paper, two novel approach laws called I-variable speed reaching law and m-variable speed reaching law are brought forward and the design method of VSC is given which is obtained straightforward by the reaching law method, based on the discrete time linear constant system. It is shown that under the action of the VSC on the system the reaching mode and sliding mode have changeable speeds, the good performance of reaching mode is kept and the chatter of quasi-sliding mode is weakened very well. Therefore, the performance of the closed loop system is improved. The simulation results have revealed that the design methods are effective and feasible.

关 键 词：变速趋近律 变结构控制(VSC) 准滑动模态带 离散系统 

分 类 号：TP13[自动化与计算机技术—控制理论与控制工程]