Application of spectral kurtosis to the detection of tip vortex cavitation noise in marine propeller

In marine propeller, the tip vortex cavitation and its relevant noise has been the subject of extensive researches up to now. Among the most cases of experimental approaches, accurate and objective detection of cavitation inception is primary, which is the main topic of this paper. While radiating a...

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Bibliographic Details
Published in:Mechanical systems and signal processing 2013-10, Vol.40 (1), p.222-236
Main Authors: Lee, Jeung-Hoon, Seo, Jong-Soo
Format: Article
Language:English
Subjects:
Cavitation
DEMON
Envelopes
Inception
Kurtosis
Marine
Noise
Propellers
Spectra
Spectral kurtosis
Tip vortex cavitation
Wing tip vortices
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Summary:In marine propeller, the tip vortex cavitation and its relevant noise has been the subject of extensive researches up to now. Among the most cases of experimental approaches, accurate and objective detection of cavitation inception is primary, which is the main topic of this paper. While radiating an explosive-bursting noise into the surrounding medium, the cavitation occurs whenever the propeller blade passes through so-called wake-peak zone. Likewise the faulty bearing cases, hence, periodic occurrence of bursting noise induced from tip vortex cavitation provides a confirmative diagnostic proof, whereby the DEMON analysis(DEtection of envelope MOdulation on Noise or sometimes referred as Envelope analysis) can be effectively employed. Recently, the concept of spectral kurtosis significantly resolved an enhancement of such impulsiveness in a signal with a strong additive noise, which is a prerequisite for the DEMON processing. By taking advantage of the benefit, this paper deals with its applicability to the detection of tip vortex cavitation in propeller. For an acoustic measurement in water cavitation tunnel, the optimum filtration band from 65kHz to 130kHz could be obtainable by the spectral kurtosis. Also subsequent DEMON analysis showed a satisfactory result in detecting the cavitation inception. •Detecting tip vortex cavitation in propeller is of importance for commercial or military purposes.•Impulsive noise characteristics induced by cavitation was extracted by spectral kurtosis.•Following DEMON analysis pointed out the presence of cavitation.•Illustrations were given by experimental measurements in water cavitation tunnel.
ISSN:0888-3270
1096-1216
DOI:10.1016/j.ymssp.2013.04.002