Some Issues Of Network Control System Research

Along with the rapid development of the three disciplines of the computer science, networkscience and communication science and technology and the network control system circuit of thenecessary development of a variety of hardware structure tending to automation, thedevelopment of high speed Ethernet technology and fieldbus technology have successfullypromoted the network control system into practical life. Limited network access width, however,leads to delay or loss of the data signals. The actual environment of the interference signal andthe vulnerability of actuators model leads to actuator failure, which often lead to reason thatmakes system performance is not good, even is not stable. So, for these specific problems,carrying out a detailed analysis to effectively control system can promote the development oftheoretical and practical significance.Two typical model of the general and the singular controlled object (under the actualenvironment of the interference signal) are mainly aimed in our paper. In design to improve theutilization rate of signal resources effectively, the thought of event trigger is applied to the modeltransformation. The use of passive fault tolerant control is method to deal with the case ofactuator fragile failure failure situation. The effective Lyapunov function matrix and liberty for anetwork control system are constructed for H_∞performance analysis. The theory of LMItechnology is used to meet the initial requirements of design and performance of the controllereffectively.Paper specific research section part is as follows:(1) Because of the limit of time-delay in the network control system, in view of theuncertainty of the network induced delay, system model is modeled by the information packetloss, wrong sequence problems into consideration. Based on the matrix, Lyapunov stabilityanalysis and liberty, the discrete time signal will be as the input of the controller. The stability ofthe system not only is discussed related to time-delay system and the LMI theory that can makethe system satisfy the performance requirements of stabilization controller design method will begiven.(2) In view of the system of the actuator fragile something unexpected happens (refers tothe fault phenomenon) and the external disturbances, the method of setting and variable changelaw in order to consider in the transmission channel induction time-delay of the minimum value to avoid its value to zero to the circuit of the induction time delay to network into a variable timedelay and a small sum of long time delay, using the theory of mathematical integral inequality,the system can be asymptotically and H_∞performance meet stable with the worst condition thesufficient conditions. The H_∞fault-tolerant controller, which can tolerate the above conditionsand meet the corresponding performance, is established.(3) The controlled object is extended to the singular characteristic of object, in order toavoid unnecessary waste of information resources, the thought of event trigger mechanism isjoined in the control system design. The delay integral method and the setting method are appliedto the change of the system model. The network control system is transformed into thetime-delay of singular system with time-delay. The singular system is proved to be regular, nopulse. Then, the theory of comparative perfect time-delay and liberty matrix theory are used tostudy the problem which how to achieve stability condition under the condition of disturbanceand use the theory to solve the topic which will meet certain performanceH controller designproblem.