HYBRID UNKNOWN INPUT OBSERVER FOR ACTUATOR FAULT DETECTION AND COMPENSATION

2011 ◽  
Vol 44 (1) ◽  
pp. 4356-4361
Author(s):  
Denis Efimov ◽  
Ali Zolghadri ◽  
Tarek Raïssi
Keyword(s):  
Fault Detection ◽  
Unknown Input ◽  
Actuator Fault ◽  
Unknown Input Observer

scholarly journals Robust nonlinear observer design for actuator fault detection in diesel engines

2013 ◽  
Vol 23 (3) ◽  
pp. 557-569 ◽  
Author(s):  
Boulaid Boulkroune ◽  
Issam Djemili ◽  
Abdel Aitouche ◽  
Vincent Cocquempot
Keyword(s):  
Nonlinear Systems ◽  
Fault Detection ◽  
Estimation Error ◽  
Nonlinear Observer ◽  
Disturbance Attenuation ◽  
Mean Value Theorem ◽  
Unknown Input ◽  
Actuator Fault ◽  
Unknown Input Observer ◽  
Varying Coefficients

Abstract This paper is concerned with actuator fault detection in nonlinear systems in the presence of disturbances. A nonlinear unknown input observer is designed and the output estimation error is used as a residual for fault detection. To deal with the problem of high Lipschitz constants, a modified mean-value theorem is used to express the nonlinear error dynamics as a convex combination of known matrices with time-varying coefficients. Moreover, the disturbance attenuation is performed using a modified H∞ criterion. A sufficient condition for the existence of an unknown input observer is obtained using a linear matrix inequality formula, and the observer gains are obtained by solving the corresponding set of inequalities. The advantages of the proposed method are that no a priori assumption on the unknown input is required and that it can be applied to a large class of nonlinear systems. Performances of the proposed approach are shown through the application to a diesel engine model.

scholarly journals 4-mecanum wheeled mobile robot actuator fault detection & isolation using unknown input observer-based approach

2020 ◽  
Author(s):  
Samia MELLAH ◽  
Guillaume GRATON ◽  
El Mostafa EL ADEL ◽  
Mustapha OULADSINE ◽  
Alain PLANCHAIS
Keyword(s):  
Fault Detection ◽  
Mobile Robot ◽  
Wheeled Mobile Robot ◽  
Unknown Input ◽  
Actuator Fault ◽  
Unknown Input Observer

Fault Detection and Isolation in Power Systems Using Unknown Input Observer

2019 ◽  
pp. 38-58 ◽  
Author(s):  
Hassan Haes Alhelou
Keyword(s):  
Fault Detection ◽  
Power Systems ◽  
Frequency Control ◽  
Load Frequency Control ◽  
Fault Detection And Isolation ◽  
Unknown Input ◽  
Unknown Input Observer ◽  
Control Loops ◽  
Interconnected Power Systems ◽  
Unknown Disturbance

Unknown input observers (UIO) find application in many cases for successful fault detection and isolation (FDI). In this chapter, a scenario where the unknown input observer is applied to load frequency control loops in interconnected power systems is analyzed. A UIO was chosen because load demand is not always constant and it can be considered to introduce an unknown disturbance to the system. Mathematical formulations on how to detect and isolate sensor faults are presented which are then implemented in MATLAB Simulink for simulations. Based on this historical survey on the application of UIO, a thesis on UIO application in FDI in distributed generation is done.

Design of Nonlinear Unknown Input Observer for Process Fault Detection

2010 ◽  
Vol 49 (22) ◽  
pp. 11443-11452 ◽  
Author(s):  
Jafar Zarei ◽  
Javad Poshtan
Keyword(s):  
Fault Detection ◽  
Unknown Input ◽  
Unknown Input Observer
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