The application of wavelet analysis to diagnosing faults in gas turbines is examined in the present paper. Applying the wavelet transform to time signals obtained from sensors placed on an engine gives information in correspondence to their Fourier transform. Diagnostic techniques based on Fourier analysis of signals can therefore be transposed to the wavelet analysis. In the paper the basic properties of wavelets, in relation to the nature of turbomachinery signals, are discussed. The possibilities for extracting diagnostic information by means of wavelets are examined, by studying the applicability to existing data from vibration, unsteady pressure, and acoustic measurements. Advantages offered, with respect to existing methods based on harmonic analysis, are discussed as well as particular requirements related to practical application.

Issue Section:
Gas Turbines: Controls and Dynamics
Topics:
Gas turbines, Wavelets, Signals, Acoustics, Engines, Fourier analysis, Fourier transforms, Pressure, Sensors, Turbomachinery, Vibration, Wavelet transforms
1.
Cempell, C., 1991, Vibroacoustical Condition Monitoring, Ellis Horwood Limited, ISBN 0-13-931718-X.
2.
Collacott, R. A., 1977, Mechanical Fault Diagnosis and Condition Monitoring, Chapman and Hall Ltd, ISBN 0-412-12930-2.
3.
Loukis, E., Wetta, P., Mathioudakis, K., Papathanasiou, A., and Papailiou, K., 1991, “Combination of Different Unsteady Quantity measurements for Gas Turbine Blade Fault Diagnosis,” ASME paper 91-GT-201.
4.
Mathioudakis
K.
,
Papathanasiou
A.
,
Loukis
E.
, and
Papailiou
K.
,
1991
, “
Fast Response Wall Pressure Measurement as a Means of Gas Turbine Blade Fault Identification
,”
ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER
, Vol.
113
, pp.
269
–
275
.
5.
Meyer, Y., 1993, Wavelets: Algorithms & Applications, SIAM, Philadelphia.
6.
Meher-Homji, C. B., 1995, “Blading Vibration and Failures in Gas Turbines, Part C: Detection and Troubleshooting,” ASME Paper No. 95-GT-420.
7.
Newland, D. E., 1993, An Introduction to Random Vibrations, Spectral & Wavelet Analysis, Longman, Harlow; Wiley, New York.
8.
Newland
D. E.
,
1994
a, “
Wavelet Analysis of Vibration, Part 1: Theory
,”
ASME Journal of Vibration and Acoustics
, Vol.
116
, pp.
409
–
416
.
9.
Newland
D. E.
,
1994
b, “
Wavelet Analysis of Vibration, Part 2: Wavelet Maps
,”
ASME Journal of Vibration and Acoustics
, Vol.
116
, pp.
417
–
425
.
10.
Simmons, H. R., and Smalley, A. J., 1989, “Effective Tools for Diagnosing Elusive Turbomachinery Dynamic Problems in the Field,” ASME Paper No. 89-GT-71.
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