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Open AccessArticle

Evaluation of the Continuous Wavelet Transform for Detection of Single-Point Rub in Aeroderivative Gas Turbines with Accelerometers

1
Department of Applied Mathematics, Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid, Calle de José Gutiérrez Abascal 2, 28006 Madrid, Spain
2
Department of Mechanical Engineering, Escuela Técnica Superior de Ingenieros Industriales, Universidad Politécnica de Madrid, Calle de José Gutiérrez Abascal 2, 28006 Madrid, Spain
3
Baker Hughes, a GE Company—Bently Nevada, Calle Josefa Valcárcel 26, 28027 Madrid, Spain
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(6), 1931; https://doi.org/10.3390/s18061931
Received: 10 May 2018 / Revised: 5 June 2018 / Accepted: 11 June 2018 / Published: 13 June 2018
(This article belongs to the Section Physical Sensors)
A common fault in turbomachinery is rotor–casing rub. Shaft vibration, measured with proximity probes, is the most powerful indicator of rotor–stator rub. However, in machines such as aeroderivative turbines, with increasing industrial relevance in power generation, constructive reasons prevent the use of those sensors, being only acceleration signals at selected casing locations available. This implies several shortcomings in the characterization of the machinery condition, associated with a lower information content about the machine dynamics. In this work, we evaluated the performance of Continuous Wavelet Transform to isolate the accelerometer signal features that characterize rotor–casing rub in an aeroderivative turbine. The evaluation is carried out on a novel rotor model of a rotor–flexible casing system. Due to damped transients and other short-lived features that rub induces in the signals, the Continuous Wavelet Transform proves being more effective than both Fourier and Cepstrum Analysis. This creates the chance for enabling early fault diagnosis of rub before it may cause machine shutdown or damage. View Full-Text
Keywords: machine fault diagnosis; rotordynamics; rub; aeroderivative turbines; accelerometers; early fault detection; Fourier analysis; real cepstrum; continuous wavelet transform machine fault diagnosis; rotordynamics; rub; aeroderivative turbines; accelerometers; early fault detection; Fourier analysis; real cepstrum; continuous wavelet transform
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Silva, A.; Zarzo, A.; Munoz-Guijosa, J.M.; Miniello, F. Evaluation of the Continuous Wavelet Transform for Detection of Single-Point Rub in Aeroderivative Gas Turbines with Accelerometers. Sensors 2018, 18, 1931.

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