Event Trigger Based Fault Detection For Nonlinear Switched System

The switched system is composed of multiple switched subsystems and a set of switched rules.In the daily life and industrial field,many complex systems can be modeled as nonlinear switched systems to study,such as network control system,power system,aircraft control system,mechanical system,etc.The main purpose of this paper is to design a suitable fault detection device to detect the system fault in time and effectively in the network environment.Due to the introduction of network,there will be network induced phenomena in data transmission in the network,suchsaslpacketsloss,delay,quantization error,etc.,which sometimes seriously affect the performance of the system.Theref ore,these factors need to be considered in the actual research.The bandwidth of the net work is limited,resulting in network congestion and waste of resources.The event tri-ggering mechanism makes the system reduce the amount of data transmission under the premise of ensuring certain performance,and effectively alleviate this problem.Based on the above analysis,this paper first models the discrete switch ed system with sector nonlinearity,introduces event triggers,and reduces the amount of data packets by judging whether the triggering conditions are met at each sampling time.The fault detection device is designed with filter,taking into account the filter caused by event triggering and the mode of the original switch ed system Based on the state mismatches,an asynchronous switched model is established.The stability and performance of the system are guaranteed by using Lyapunov function method and average dwell time technology.Secondly,on the basis of the previous chapter,the network ind uced factors such as packet loss and quantization error are added in turn.The network packet loss is modeled as Bernoulli random process.The log quantizer is used to quantize the data.The event trigger and fault filter are also designed,and the asynchr onous switched model of the system is established.With the help of Lyapunov function met-hod and average residence time method The stability and performance conditions of the system are analyzed by linear matrix inequality technique,and the correctness o f the theorem proposed in this paper is verified by an example of a dual-mode switched system.