不确定短时延网络控制系统的故障检测

针对远程被控对象为线性模型,且网络诱导时延小于一个采样周期的一类网络控制系统(NCS),假设可能发生执行器故障,对系统进行故障检测。将随机时延对系统的影响转化为未知有界条件下的不确定项,建立了系统的离散数学模型。按照时延补偿策略设计了系统的故障观测器,并基于Lyapunov稳定性定理和线性矩阵不等式理论,推导出了整个观测器系统全局渐近稳定的充分条件。仿真例子验证了方法的有效性。

Fault Detection of Networked Control Systems with Uncertain Short Time-delay

To a class of network control systems with linear remote controlled object and the time-delay less than one sampling period,the fault detection is carried out when actuator faults are supposed.The impact of random time-delay on the system is converted to the unknown bounded uncertain disturbance and the discrete mathematic model is set up.The fault state observers of system is designed according to the time-delay compensation strategy.And on the basis of Lyapunov stability theory and LMI theory,the sufficient condition of globally asymptotic stability of the whole system is deduced.Finally,the result of simulation shows the effectiveness of the proposed method.