Fault Detections Of Networked Control Systems With Communication Constraints

For large-scale networked control systems (NCSs), numerous communicationcomponents (sensors, actuators, controllers and filters) are located in different spatiallocations, the transmission of information via a shared communication networks withlimited bandwidth, which leads to the problem of so-called communication constraints.Therefore, the design of reasonable scheduling strategy to make full of limited bandwidth,especially, co-design of scheduling and control has important theoretical and practicalsignificance. In this paper, for NCSs with communication constraints, the mainachievements are listed as follows:(1) Firstly, for the limited communication network, the data transmissioncharacteristics of multi-channel in both from sensor to controller (S/C) channel and fromcontroller to actuator (C/A) channel are investigated; two independent Markov chains areintroduced to describe the dynamic scheduling strategy of multi-channel in both S/Cchannel and C/A channel. Based on co-design of controller and scheduling strategy, weestablish a Markov jump system model.(2) Based on the model of NCSs with communication constraints, with the help oflinear matrix inequality method and Lyapunov stability theory, the fault detection problemof NCSs in the H-infinity framework is investigated. The sufficient condition whichsatisfies the stochastic stability and H-infinity prescribed attenuation level is satisfiedsimultaneously. Especially, the desired fault detection filters are constructed in terms ofcertain linear matrix inequalities (LMIs), and explicit parameters are characterized if theseLMIs are feasible. The effectiveness of the proposed method is demonstrated bysimulation examples.(3) By using the Turetime2.0toolbox, we build two simulation platforms inMatlab/Simulink. With the help of simulations, we show the impact of scheduling strategyon the system performance. In the same time, co-design of control and scheduling strategyis considered in the section, and its effect on stability is highlighted.