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Bispectral Analysis in Vibroacoustic Diagnostics of Gears

Radkowski S.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2001

vol. 49, nr 2

249-265

The work concerns diagnosis of the origins and development of early stages of defects based on information found in the vibroacoustic signal. At the beginning the necessity of selection of diagnostic parameters dependent upon the amount of dissipated energy and related defect development is proven. Assuming that the basic role in transmission of such diagnostic information is played by the phenomena of amplitude and phase modulation of the vibroacoustic signal and non-linear effect of system, it is points to the significance of the signal non-linear components. For that reason in this work a model of signal in the form of a Volterra series is assumed, which enables examination of the influence that disturbances have upon non-linear components. On the basis of exemplary analysis of the contact condition disturbances, the possibility of generation of a bilinear component is presented. What serves this purpose is the model of non-linear and instantaneous contact. Simultaneously problems of selection of signal analysis methods that enable realisation of assumed aims are presented. Emphasising the fact that defect development does not always lead to a significant growth of the vibroacoustic signal power, the author has shown importance of methods of higher-order spectral analysis like, bispectrum and Wigner's distribution.