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Experimental investigation on the use of bispectral analysis in detecting nonlinear faults in hydraulic machines

Leong, Mohd. Salman and Somia Alfatih, M. S. and Hee, L. M. (2014) Experimental investigation on the use of bispectral analysis in detecting nonlinear faults in hydraulic machines. Applied Mechanics and Materials, 606 . pp. 147-151. ISSN 1660-9336

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Official URL: https://dx.doi.org/10.4028/www.scientific.net/AMM....

Abstract

Bispectral analysis is one of the relatively more recent tools in signal processing used for detection and identification of higher harmonics in a signal. It is also acknowledged to be one of Higher Order Spectral Analysis (HOSA) effective tools for detecting nonlinear behavior in mechanical systems. In this study, vibration sources in a hydraulic machine which may have features of nonlinear behavior were investigated. An experimental study was undertaken to formulate a more sensitive and effective method using bispectral analysis to diagnose cavitation in a centrifugal pump facility. Cavitation was induced on the suction side of the pump. The cavitation signal was analyzed with and without induced cavitation conditions at different locations on the pump, and analyzed using FFT and bispectrum methods. It was observed that bispectral analysis could be used as an early indicator of cavitation with changes for severity of cavitation.

Item Type:Article
Uncontrolled Keywords:bispectral analysis, cavitation, vibration signal analysis
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Others
ID Code:52806
Deposited By: Siti Nor Hashidah Zakaria
Deposited On:01 Feb 2016 03:53
Last Modified:04 Jul 2018 11:51

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