Based On State Observer Robust Fault Diagnosis Of Research

Fault diagnosis and robust fault-tolerant control problem, have been put forward fromthe popular with Chinese and foreign scholars’ attention, it has a good application prospect.With the improvement of science and technology, the application range of the controlsystem is expanding constantly, system of complex program increases day by day andpeople to control the requirements is increasing day by day, make people on the systemfault diagnosis technology and the fault-tolerant control technology of the output,accuracy, reliability, safety requirements also increasing. In our life there many practicalexamples show once produced fault, even small fault, will also destroy the security andstability of the system, it can bring about great loss and damage. So robust fault diagnosistechnology and the fault-tolerant control technology the great attention to by the people,for the actual dynamic system model is not easy to build, this makes the performance ofthe system requirements are difficult to reach people expected, so people pay more andmore attention to the robust fault diagnosis and fault-tolerant control technologydevelopment, to ensure that the control system can reach people of the expectations ofvarious performance indicators, has very important practical significance.This paper for the linear and nonlinear dynamic system based on state observermethod and adaptive technology the diagnosis and fault tolerant control problem. Themain work is as follows:1According to the linear dynamic systems with disturbance, and improve theefficiency and accuracy of the fault estimates, fault tolerant of the feasibility and highefficiency. Using a new fast adaptive failure estimation algorithm to design the adaptivefault diagnosis observer, the disturbance of linear systems with fault estimates, so as toenhance the disturbance of linear system with the failure of the estimate efficiency andrate. In fault detection and diagnosis independent, under the premise of disturbance in thelinear with dynamic system, the design of a new control scheme in the past to avoidmention that these fault-tolerant control scheme of some typical faults, this design has astrong bill the practicability and feasibility.2For a class of nonlinear and with external disturbance system, based on theanalysis of the model fault estimation scheme and prominent fault-tolerant control. Putforward based on the observer adaptive fault diagnosis of the existence conditions, it canbe used to prove whether there are adaptive fault diagnosis observer; Using a new fast adaptive failure estimation algorithm to design the adaptive fault diagnosis observer, thedisturbance of the nonlinear systems with fault estimates, so as to enhance the disturbanceof the nonlinear system fault with estimated the rapidity and the accuracy; Adaptive faultdiagnosis based on the observer observer and controller in fault tolerant nature can bedivided on the basis of the design can be alone.3Nonlinear satellite attitude control system, the design is unknown input observer.Based on the given with unknown input nonlinear satellite attitude control system model,with lyapunov stability method gives unknown input observer conditions of existence.Based on this condition, puts forward the unknown input observer design problem.Simulation examples are presented to illustrate the feasibility and effectiveness of themethod.