线性多变量离散系统全程滑模变结构控制

讨论线性多变量离散不确定系统滑模变结构控制问题。利用全程滑动模态的思想，通过构造切换函数，使系统的轨线一开始便落在切换面上，缩短了到达时间，增强了系统的鲁棒性；利用系统的摄动、干扰与采样时间的关系，改进了控制律的设计，使结论条件更符合物理意义。仿真实例说明了该方法的有效性。

Global sliding mode control for uncertain discrete time systems

A switching surface for multi-variable uncertain discrete time systems is designed by using global sliding mode method. This approach guarantees that the trajectory of the system arrives at the switching surface at the very beginning. The reaching time is reduced and the system robustness is improved. The research also deduces the design of control law via the relationship among the parameter variation, uncertain disturbance and sampling time, which makes the conclusion more valuable in physics and is easy to design the control law. The simulation results show that the approach is effective.