Fault Diagnosis For Networked Control System With Delays

With the development of network technology, more and more control systems adopt communication network to realize close-loop, which means information exchange and control signal transmission between components such as controller. sensor and actuator is completedby communication network. This is the research object in this dissertation------networkedcontrol system. Because of the complexity of network, this is kind of system has higher level of demands for safety and reliability than general system. Therefore to research on fault diagnosis of networked control system has great theoretical and applied value.Now the research of the fault detection for the networked control system is building mathematical models, or making some method of the fault diagnosis to the normal networked control system. But not do the fault diagnosis for networked control system with delays. So I will test the model by the MATLAB/Simulink.In this dissertation, through the theory of the fault detection for the networked control system is studied, the present research situation of network control system is introduced. The internal and international research results, thoughts and methods of fault diagnosis is summarized. On basis of the deferent delay causes, four deferent mathematical models are introduced in the 2nd part. In 3rd part the algorithm of augment model observer, equative input observer and Kalman filter for input-delay model are analyzed. and the expression of residue is given. At last base on the simulate software MATLAB/Simulink, the input-delay model of I and IV are tested, then the test results of simulation are analyzed. The test result of simulation indicates that the observer for input-delay model of Augment model observer, equative input observer and an input-delay Kalman filter evidently improves the dynamic property of control system.