传感器饱和约束下网络化系统的故障检测

Fault Detection for Networked Systems with Sensor Saturation

针对通信带宽受限和传感器饱和约束的网络环境,通过引入一种基于事件触发机制的传输策略,研究一类网络化动态系统的故障检测问题。首先,以全阶滤波器作为残差发生器并利用状态增广的方法将原系统故障检测问题转化为H∞滤波问题;然后,利用Lyapunov稳定性理论和时滞系统自由权阵分析方法建立了故障检测滤波器的存在条件,并基于此条件求解凸优化问题得到最优滤波器参数;最后,通过数值仿真验证所提出事件触发机制故障检测方法的有效性。

The fault detection problem is investigated for a class of networked systems with sensor saturation and communication constraint.A novel event-triggered mechanism is introduced to save limited network resource in the sensor-to-filter channel.After properly augmenting the states of the original system and the fault detection filter,the addressed fault detection problem is converted into an auxiliary H∞filtering problem.By utilizing Lyapunov stability theory and free-weighting matrix technique,the sufficient conditions for the existence of the fault detection filter is established in terms of linear matrix inequalities,and the corresponding optimal filter parameters can be easily derived by solving a convex optimization problem via a semi-definite program method.Finally,a numerical example is provided to illustrate the validity of the event-triggered fault detection scheme.