一类介质访问约束下的网络控制系统设计

针对多输入多输出的网络控制系统,传感器和执行器为时间驱动,由于网络资源的有限性,在每个传输周期内,系统往往只有部分传感器和执行器得到网络介质访问权,与远程控制器进行数据传输,这称为网络控制系统的介质访问约束性,它极大地影响到系统的稳定性和控制性能,成为网络控制中亟待解决的问题。针对这一问题将网络控制系统建模为输出矩阵和输入矩阵随介质约束改变的切换系统,并利用切换系统分析方法和稳定性理论,设计了切换观测器和基于观测器的状态反馈控制器,分析了周期调度下该网络控制闭环系统的稳定性,最后通过仿真验证了这种方法的有效性。

Class of networked control systems design under medium access constraints

The plant of MIMO networked control systems(NCSs) are considered,of which the sensors and actuators are time-driven.Because of limited network resource,only some of sensors and actuators are accessing the communication medium and exchanging information with the remote controller at every transmission period.This is so called network medium access constraints.It affects the stability and control performance of the system extremely,which becomes a problem needs to be solved urgently in the NCSs.This class of NCSs is modeled as switched systems whose output matrixes and input matrixes can vary under medium access constraints.Based on the analytical methods and stability theory of switched systems,a straightforward approach is proposed to design switched observer and state feedback controller,then to analyze stability of closed-loop NCSs under periodic scheduling.Finally,an example is given to support the method.