Title :
Disturbance observer based fault diagnosis
Author :
Jinya Su ; Wen-Hua Chen ; Baibing Li
Author_Institution :
Dept. of Aeronaut. & Automotive Eng., Loughborough Univ., Loughborough, UK
Abstract :
This paper investigates the differences between disturbance observer techniques and residual generation method in fault diagnosis. We firstly point out the possible limitations of residual based approach compared with fault estimation based approach through sensors fault diagnosis of a linear motor driving system. On the one hand, it may produce a residual insensitive to the fault due to the self-correction feature of the observer. On the other hand, the diagnosis logic of it is complicated and does not work when the observability conditions do not hold. On this basis, the nonlinear disturbance observer is further introduced to perform actuator fault diagnosis for a nonlinear system. Simulation results of a linear motor driving system and a nonlinear missile system illustrate the efficiency of fault estimation based diagnosis approach.
Keywords :
fault diagnosis; linear motors; machine control; motor drives; nonlinear systems; observers; actuator fault diagnosis; diagnosis logic; disturbance observer based fault diagnosis; fault estimation based approach; linear motor driving system; nonlinear disturbance observer; nonlinear missile system; residual generation method; sensor fault diagnosis; Actuators; Fault diagnosis; Mathematical model; Missiles; Observers; Sensors; Fault Diagnosis; Missile System; Motor System; Nonlinear Disturbance Observer; Robustness;
Conference_Titel :
Control Conference (CCC), 2014 33rd Chinese
Conference_Location :
Nanjing
DOI :
10.1109/ChiCC.2014.6897123