Title: Fault actuators detection based on inputs-outputs data mapping: application to a robot manipulator

Authors: Lilia Sidhom; Inès Chihi

Addresses: Laboratory of Automation Research (LA. RA), National School of Engineering of Tunis, University Tunis El Manar, Rue Béchir Salem Belkhiria, BP 37, 1002, Le Bélvédère, 1002, Tunis, Tunisia ' Laboratory of Automation Research (LA. RA), National School of Engineering of Tunis, University Tunis El Manar, Rue Béchir Salem Belkhiria, BP 37, 1002, Le Bélvédère, 1002, Tunis, Tunisia

Abstract: This paper deals with a fault estimation algorithm to reconstruct faulty inputs of a process under actuators faults. This approach is based on a generic model with outputs/inputs data mapping to reconstruct the faulty inputs. The key idea consists on dynamic parameters identification of this generic model in real time for abrupt and intermittent faults. To apply this approach, these dynamic parameters are estimated basing on the recursive least squares solution obtained from the sampling of the dynamic model along a closed loop tracking trajectory. Indeed, the control loop requires information about the state derivative of the outputs system. For this aim, a dynamic gains sliding mode differentiator is introduced. By using measured signals, the proposed approach is validated on a bi-axis robot manipulator to evaluate its usefulness on actuators faults detection.

Keywords: detection and isolation fault; online estimation; dynamic gains sliding mode differentiator; robot manipulator; experimental results.

DOI: 10.1504/IJAMECHS.2017.095891

International Journal of Advanced Mechatronic Systems, 2017 Vol.7 No.5, pp.328 - 336

Received: 18 Jan 2018
Accepted: 04 Jul 2018
Published online: 25 Oct 2018 *

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