Vibration Analysis for Machine Monitoring and Diagnosis: A Systematic Review

Table 7

The advantages and disadvantages of frequency domain methods.

Frequency domain methods		Advantages	Disadvantages
FFT		Easy to implement, fast technique	Cannot efficiently analyze transient features in time
Cepstrum Analysis		Easy to implement, useful in side band analysis	Can only be applied to the well separated harmonics, the fluctuations of the curve of the spectrum are averaged-out due to the filtering
Envelope analysis	Excellent application in bearing system, works well even in the presence of a small random fluctuation			Can lead to a gross diagnosis error, not suitable to be applied in the gear system
Spectrum analysis	Useful in detecting signal that changes significantly over a short period of time, higher spectral estimation performance compared to the FFT			Require experts’ skills due to its complexity