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Non-linearity and intermodulation phenomena tracking as a method for detecting early stages of gear failures

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An understanding of vibroacoustic signal is required for the robust and more effective detection of early stage gear failure. In the paper, the possibility and method of time varying vibration decomposition are discussed. It is shown that by analysing the coupling between the frequency spectrum components, it is possible to observe relationship changes from linear to nonlinear or changes of degree of non-linearity and modulations, which can be used as measures in structural health monitoring.

In addition, an analytical connection is investigated between the tracking method and the physics of the gear contact process based on the idea of higher-order spectra analysis, bispectral analysis especially.
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Keywords: Vibroacoustic diagnostics; bispectrum; gears; modulation phenomena

Document Type: Research Article

Affiliations: Institute of Machine Designs Fundamentals, Warsaw University of Technology.

Publication date: August 1, 2008

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