![]() Sidebands are grouped around gear mesh frequency and harmonics as intervals in multiples of modulating frequencies, and determining these modulation frequencies is very useful in diagnosing the error. Because a series of errors tend to cause modulation of the vibration pattern that results from tooth meshing, and this modulation leads to sidebands in the frequency spectrum. The presence of such sidebands is intriguing in the analysis of gearbox vibration signals. In vibration analysis, it can be used to identify gearbox faults, especially where the carrier frequencies and equally-spaced sidebands in the spectrum are produced. The Cepstral Analysis is a tool for detecting periodicity in the frequency spectrum and it is mainly used in pitch detection, radar and sonar applications, speech analysis, and diagnostics. We examine the periodicity that occurs with certain frequency spacings in the spectrum with Cepstral Analysis. When we put the raw signal into the Fourier Transform, we get the “Spectrum”. The spectrum provides information about the periodic behavior in the raw signal. ![]() Spectral analysis generates the vibration signature of the machines as well. ![]() The most common of these is the spectral analysis that we study in the frequency domain. When doing vibration analysis, the signals received from accelerometers in time waveform are examined in different domains by various mathematical transformations.
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