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Sharma & Aldeen Fault and Disturbance Reconstruction in Nonlinear Systems using a Network of
 

Summary: Sharma & Aldeen
Fault and Disturbance Reconstruction in Nonlinear Systems using a Network of
Interconnected Sliding Mode Observers
R. Sharma and M. Aldeen
National ICT Australia
Victoria Research Laboratory
Department of Electrical and Electronic Engineering
The University of Melbourne, Parkville, VIC 3010, Australia
(r.sharma@ee.unimelb.edu.au, m.aldeen@ee.unimelb.edu.au)
Abstract--A new technique for fault diagnosis and estimation of unknown inputs in a class of
nonlinear systems is presented in this paper. The novelty of the approach is based on utilization of
a network of two interconnected sliding mode observers, the first is used for fault diagnosis and the
second is used for estimation of unknown inputs. The two observers exchange information about
their respective reconstructed signals online and in real time. Conditions and proofs of conversion
are presented. A salient feature of the proposed approach is that the state trajectories do not leave
the sliding manifold even in presence of unknown disturbances and faults. This allows for faults
and unknown inputs to be reconstructed based on information retrieved from the equivalent
output error injection signal.
Keywords: Fault reconstruction, sliding mode, nonlinear observer.
I. INTRODUCTION

  

Source: Aldeen, Mohammad - Department of Electrical and Electronic Engineering, University of Melbourne

 

Collections: Engineering