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TECHNICAL PAPERS: Gas Turbines: Controls, Diagnostics, and Instrumentation

The Use of Probabilistic Reasoning to Improve Least Squares Based Gas Path Diagnostics

[+] Author and Article Information
C. Romessis

Laboratory of Thermal Turbomachines, National Technical University of Athens, P.O. Box 64069, Athens 15710, Greececristo@mail.ntua.gr

Ph. Kamboukos

Laboratory of Thermal Turbomachines, National Technical University of Athens, P.O. Box 64069, Athens 15710, Greecephkambou@central.ntua.gr

K. Mathioudakis

Laboratory of Thermal Turbomachines, National Technical University of Athens, P.O. Box 64069, Athens 15710, Greecekmathiou@central.ntua.gr

J. Eng. Gas Turbines Power 129(4), 970-976 (Jul 28, 2006) (7 pages) doi:10.1115/1.2436548 History: Received June 15, 2006; Revised July 28, 2006

A method is proposed to support least square type of methods for deriving health parameters from a small number of independent gas path measurements. The method derives statistical information using sets of solutions derived from a number of data records, to produce sets of candidate solutions with a lesser number of parameters. These sets can then be processed to derive an accurate component fault diagnosis. It could thus be classified as a new type of "concentrator" approach, which is shown to be more effective than previously existing schemes. The method's effectiveness is demonstrated by application to a number of typical jet engine component faults.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic representation of diagnostic procedure

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Figure 2

Flowchart of the overall procedure of the proposed diagnostic method

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Figure 3

Estimation of PDF of variable Δf from a sample of values

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Figure 4

Calculation of DIi from the estimated PDF(Δfi)

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Figure 5

Faulty component detection from estimation of PDFs

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Figure 6

Flowchart of the two-pass procedure for the improvement of the health parameter estimation

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Figure 7

Layout and station numbering and measurements of the considered turbofan engine.

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