Gas turbine performance analysis programs convert raw measurements (thrust, fuel flow, gas path temperatures, and pressures) into engine and component figures of merit (e.g., specific fuel consumption, component efficiencies). The derived parameters allow a diagnostician to recognize a poorly performing engine and help to identify the root cause for the problem. These goals can be foiled by measurement problems or by analysis assumptions embedded in the programs. A gifted analyst learns to recognize measurement or assumption problems via characteristic “fingerprints” in the program output. The latest data analysis tools tackle the same issues using a weighted-least-squares algorithm which estimates sensor errors at the same time component health is being determined. The weighted-least-squares algorithm modifies the “fingerprint” of a measurement problem and also that of a problem-free solution. To develop intuition for these new programs, the analyst must understand how weighted-least-squares works and how normal and problem situations are reflected in the output. This paper describes the weighted-least-squares algorithm, as implemented in GE’s TEMPER program, with the goal of stimulating a new intuition for interpreting gas path analysis results.
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July 2003
Technical Papers
Interpretation of Weighted-Least-Squares Gas Path Analysis Results
D. L. Doel
D. L. Doel
GE Aircraft Engines, One Neumann Way, Evendale, OH 45215-6301
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D. L. Doel
GE Aircraft Engines, One Neumann Way, Evendale, OH 45215-6301
Contributed by the International Gas Turbine Institute (IGTI) of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Paper presented at the International Gas Turbine and Aeroengine Congress and Exhibition, Amsterdam, The Netherlands, June 3–6, 2002; Paper No. 2002-GT-30025. Manuscript received by IGTI, December 2001, final revision, March 2002. Associate Editor: E. Benvenuti.
J. Eng. Gas Turbines Power. Jul 2003, 125(3): 624-633 (10 pages)
Published Online: August 15, 2003
Article history
Received:
December 1, 2001
Revised:
March 1, 2002
Online:
August 15, 2003
Citation
Doel, D. L. (August 15, 2003). "Interpretation of Weighted-Least-Squares Gas Path Analysis Results ." ASME. J. Eng. Gas Turbines Power. July 2003; 125(3): 624–633. https://doi.org/10.1115/1.1582492
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