Multi-thresholds for fault isolation in the presence of uncertainties

Youcef Touati; Mohamed Arezki Mellal; Djamel Benazzouz

doi:10.1016/j.isatra.2016.02.012

Multi-thresholds for fault isolation in the presence of uncertainties

ISA Trans. 2016 May:62:299-311. doi: 10.1016/j.isatra.2016.02.012. Epub 2016 Feb 28.

Authors

Youcef Touati¹, Mohamed Arezki Mellal², Djamel Benazzouz³

Affiliations

¹ LMSS, Faculty of Engineering Sciences (FSI), M׳Hamed Bougara University, Boumerdes 35000, Algeria. Electronic address: touati.youcef@umbb.dz.
² LMSS, Faculty of Engineering Sciences (FSI), M׳Hamed Bougara University, Boumerdes 35000, Algeria. Electronic address: mellal.mohamed@univ-boumerdes.dz.
³ LMSS, Faculty of Engineering Sciences (FSI), M׳Hamed Bougara University, Boumerdes 35000, Algeria.

PMID: 26928518
DOI: 10.1016/j.isatra.2016.02.012

Abstract

Monitoring of the faults is an important task in mechatronics. It involves the detection and isolation of faults which are performed by using the residuals. These residuals represent numerical values that define certain intervals called thresholds. In fact, the fault is detected if the residuals exceed the thresholds. In addition, each considered fault must activate a unique set of residuals to be isolated. However, in the presence of uncertainties, false decisions can occur due to the low sensitivity of certain residuals towards faults. In this paper, an efficient approach to make decision on fault isolation in the presence of uncertainties is proposed. Based on the bond graph tool, the approach is developed in order to generate systematically the relations between residuals and faults. The generated relations allow the estimation of the minimum detectable and isolable fault values. The latter is used to calculate the thresholds of isolation for each residual.

Keywords: Diagnosis; Dynamic systems; Fault detection and isolation; Uncertainties.