Research On The Method Of Fault Diagnosis And Fault-tolerant Control For The F-16 Fighter Model

Fixed-wing aircraft is one of the most frequently used aircraft in the world so that the requirements for the safety and reliability of the aircraft control system are increasing day by day,and in the last few decades,fault diagnosis and fault-tolerant control technology is an effective way to improve the reliability of the aircraft.Among them.F-16 fighter as one of the world's most successful light fighter,with complex aircraft control system,has a strong applicability for the research of fault diagnosis and fault-tolerant control method.In this paper,a new fault diagnosis and fault-tolerant control method is designed for the simplified linear state space model of F-16 fighter,and the control stability and control performance of F-16 fighter control system are improved.The main work of this paper is as follows:Firstly,the actuator's multiplicative fault model is designed for fault diagnosis and H? fault-tolerant controller design,which is based on the simplified linear state space model of F-16 fighter.The F-16 fighter model has five actuators,each of which can be divided into three states:normal,inefficient and completely ineffective.The state of the five actuators can form a diagonal matrix as an actuator's multiplicative fault model to facilitate fault model identification and the corresponding H? fault-tolerant controller design.Secondly,based on the control law re-scheduling method,the H? fault-tolerant controller corresponding to each fault model is designed by H? fault-tolerant control theory for the actuator multiplicative fault model to form an alternative fault-tolerant controller set.Then,an optimization strategy of selecting the H? fault-tolerant controller is designed to dispatch the controller for the case of fault misdiagnosis.This strategy selects the fault-tolerant controller according to the severity of the fault model,which optimizes the robustness and control performance of the system and improves the control stability of the system.Finally,the integrated design method of fault diagnosis and fault-tolerant control is studied.By designing the improved unknown input observer,the actuator fault and external disturbance are decoupled in the fault observer to ensure that the actuator fault can be detected and diagnosed.And an actuator efficiency threshold is designed to judgment the actuator fault model.Then,according to the actuator fault model information,a select strategy of fault-tolerant controller is used to select the appropriate fault-tolerant controller to ensure the system stability.