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The Fault Diagnosis Technology Based on Models and It’s Application in the Electro-mechanical Actuator

Author: WuBin
Tutor: LiaoZuo
School: Xiangtan University
Course: Control Theory and Control Engineering
Keywords: Fault Diagnosis Electromechanical Actuator Model-based Observer Kalman filter
CLC: TP277
Type: Master's thesis
Year: 2008
Downloads: 262
Quote: 2
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Abstract


The object of this thesis is the electromechanical actuator system , the main purpose is to study the electromechanical actuator system fault diagnosis technology , in order to achieve the purpose of improve steering gear system failure diagnosis and the level of intelligence . Steering gear system fault diagnosis using decomposition into subsystems replace the test method , low detection efficiency of this method , and can not identify potential failure , the need to conduct further studies on the electric steering gear fault diagnosis method . The fault diagnosis method based on the analytical model , find potential failures and easy separation of the failure to apply it to the electric steering gear fault diagnosis can effectively improve the efficiency of diagnosis . In this paper, both theoretical and practical aspects of the model-based fault diagnosis technology to carry out a more systematic and in-depth research , the main work is as follows : First, based on the model theory of fault diagnosis , control system under normal and fault conditions to generate residual difference method and threshold selection , system failure can be diagnosed . Then, create a mathematical model of the electric servo system , the establishment of a system under normal circumstances, the simulation model , and the integrated amplifier failure, motor failure and potentiometer failure common electric steering gear failure mode analysis and simulation . Next, the construction method of the fault detection observer fault detection observer and the actual system error diagnosis and correction amplifier fault structure detection observer under ideal conditions . Outside influence and modeling errors as unknown input observer servo system sensor fault diagnosis, theory and simulation to verify the effectiveness of the method . Finally, the study of the fault diagnosis technology based on Kalman filtering , Kalman filter to generate residuals online fault diagnosis , design a residual generator based on Kalman filtering , missile electromechanical actuator fault diagnosis process simulation show that the method arrival. The conclusions of this study engineering electromechanical actuator system fault diagnosis provides an important reference .

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Monitoring, alarm,fault diagnosis system
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