Pseudo Wigner-Ville Time-Frequency Distribution and Its Application to Machinery Condition Monitoring
Article (6.080Mb)Abstract
Machinery operating in a nonstationary mode generates a signature that at each
instant of time has a distinct frequency. A Time-frequency domain representation is
needed to characterize such a signature. Pseudo Wigner-Ville distribution is ideally
suited for portraying a nonstationary signal in the time-frequency domain and is
carried out by adapting the fast Fourier transform algorithm. The important parameters
affecting the pseudo Wigner-Ville distribution are discussed and sensitivity analyses
are also performed. Practical examples of an actual transient signal are used to
illustrate its dynamic features jointly in time and frequency.
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