Reference : Constrained sparse estimation for improved fault isolation

	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Engineering, computing & technology : Aerospace & aeronautics engineering
	To cite this reference:	http://hdl.handle.net/2268/87142

Title :	Constrained sparse estimation for improved fault isolation
Language :	English
Author, co-author :	Borguet, Sébastien [Université de Liège - ULg > Département d'aérospatiale et mécanique > Turbomachines et propulsion aérospatiale >]
	Léonard, Olivier [Université de Liège - ULg > Département d'aérospatiale et mécanique > Turbomachines et propulsion aérospatiale >]
Publication date :	2011
Main document title :	Proceedings of ASME Turbo Expo 2011
Audience :	International
Event name :	ASME Turbo Expo
Event date :	June 6-10 2011
Event organizer :	International Gas Turbine Institute
Event place (city) :	Vancouver
Event country :	BC, Canada
Keywords :	[en] gas path analysis ; fault isolation ; quadratic programming ; constrained estimation
Abstract :	[en] Least-squares-based methods are very popular in the jet engine community for health monitoring purpose. Their isolation capability can be improved by using a prior knowledge on the health parameters that better matches the expected pattern of the solution i.e., a sparse one as accidental faults impact at most one or two component(s) simultaneously. On the other hand, complimentary information about the feasible values of the health parameters can be derived in the form of constraints. The present contribution investigates the effect of the addition of such constraints on the performance of the sparse estimation tool. Due to its quadratic programming formulation, the constraints are integrated in a straightforward manner. Results obtained on a variety of fault conditions simulated with a commercial turbofan model show that the inclusion of constraints further enhance the isolation capability of the sparse estimator. In particular, the constraints help resolve a confusion issue between high pressure compressor and variable stator vanes faults.
Permalink :	http://hdl.handle.net/2268/87142
Commentary :	Paper GT2011-45711

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