提升多速率系统无波纹问题研究

On ripple-free problem of lifted multirate control systems

对于多速率采样控制系统,在应用提升技术进行分析设计时闭环输出存在采样点间波纹的现象,首先总结了控制器为比例环节时,各种被控对象在不同参考输入信号作用下系统输出中有无波纹及相应消除波纹的方法;然后应用极点配置法,分析并给出了控制器含有动态环节时消除波纹的方法,并结合实例在MATLAB环境下编程实现.

In allusion to the phenomena that there exist intersample-ripples in closed-loop outputs of multirate system when analyzing or designing the system using lifting technology, firstly, whether there existing intersample-ripples and the methods to eliminate the existing intersample-ripple are summarized for diversified plants under different reference signals in proportional controller case. Then, by applying pole-placement approach, an approach to avoid intersample-ripples in dynamic controller case is proposed. The concrete examples are realized under MATLAB environment.