Abstract
Abstract: The vibration signal carries the signature of faults in most rotating equipments, and early fault detection is possible by analyzing the signal using different signal processing techniques. In this paper we consider a gearbox as a typical representation of a rotating or cyclo-stationary process. Faults in gearboxes leave their signature on the vibration signal and generally manifest themselves as a non-linear transformation in the signal. Bicoherence analysis detects and quantifies the presence of non-linearity in the signal and thus indicates the severity of the fault in the gearbox. In this work, time synchronous averaging is used to find the proper representation of one period of the cyclo-stationary vibration signal. A pilot scale gearbox case study is presented to demonstrate the practicality and utility of the proposed technique.
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