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中文摘要：
分析了不确定离散时间系统变结构控制的常用设计方法的优缺点，提出了一种新的离散趋近律，并利用它设计了变结构控制器；对不确定部分建立灰色估计模型，估计出参数值．该方法缩短了系统到达滑模面的时间，有效地减弱了抖振强度和不确定因素的影响．理论分析和仿真结构表明，此方法是可靠的，使所得到的变结构控制系统具有良好的性能，保证了系统的稳定性．
英文摘要：
Features of some usual design methods of variable structure control for uncertain discrete time systems are analyzed. A new discrete reaching law is presented and the variable structure controller is obtained. A grey estimating model is built for the uncertain part and thus presented values are obtained. The method reduces reaching time and eliminates system chattering effectively. The theory analysis and simulation demonstrate that the method is feasible and guarantees good performance of variable structure control systems. It retains the stability of the system.
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