Transient analysis on machinery condition monitoring

In this research, three main time-frequency/time-scale (TF/TS) analysis algorithms-windowed Fourier transform (WFT), Wigner-Ville distribution (WVD), and wavelet analysis (WA), have been studied and implemented. We compare the different algorithms using an identical set of synthetic signals, from which one can realize their individual features. To justify the effectiveness and to highlight the requisite of using TF/TS analysis, two test-benches have been conducted and investigated. One is to analyze transient vibration signals measured on the end-effector of an industrial robot during plane motion and the other is to analyse the nonstationary vibration response of a rotor-dynamic system with both an electro-mechanical clutch and brake.