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Analysis versus synthesis for trending of gas-path measurement time series
Borguet, Sébastien; Léonard, Olivier; Dewallef, Pierre
2014In Proceedings of ASME Turbo Expo 2014
Peer reviewed
 

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Keywords :
time series filtering; quadratic programming; gas-path analysis
Abstract :
[en] Gas-path measurements used to assess the health condition of an engine are corrupted by noise. Generally, a data cleaning step occurs before proceeding with fault detection and isolation. Classical linear filters such as the exponentially weighted moving average filter are traditionally used for noise removal. Unfortunately, these low-pass filters distort trend shifts indicative of faults, which increases the detection delay. The present paper investigates two new approaches to non-linear filtering of time series. On one hand, the synthesis approach reconstructs the signal as a combination of elementary signals chosen from a pre-defined library. On the other hand, the analysis approach imposes a constraint on the shape of the signal (e.g., piecewise constant). Both approaches incorporate prior information about the signal in a different way, but they lead to trend filters that are very capable at noise removal while preserving at the same time sharp edges in the signal. This is highlighted through the comparison with a classical linear filter on a batch of synthetic data representative of typical engine fault profiles.
Disciplines :
Aerospace & aeronautics engineering
Author, co-author :
Borguet, Sébastien ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Turbomachines et propulsion aérospatiale
Léonard, Olivier ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Turbomachines et propulsion aérospatiale
Dewallef, Pierre ;  Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes de conversion d'énergie pour un dévelop.durable
Language :
English
Title :
Analysis versus synthesis for trending of gas-path measurement time series
Publication date :
June 2014
Event name :
ASME Turbo Expo 2014
Event organizer :
American Society of Mechanical Engineers
Event place :
Düsseldorf, Germany
Event date :
16-20 juin 2014
Audience :
International
Main work title :
Proceedings of ASME Turbo Expo 2014
Pages :
GT2014-26029
Peer reviewed :
Peer reviewed
Available on ORBi :
since 08 July 2014

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