Complex Shifted Morlet Wavelets (CSMW) can be used for the demodulation of the vibration response of defective rolling element bearings, as they present a number of advantages. The most important is that according to this method, the maximal time-frequency resolution is obtained, while the magnitudes of the complex wavelet coefficients in the time domain lead directly to the required envelope. However, the key element for the successful application of the method is the optimal selection and location of the corresponding necessary time-frequency window both in the time and in the frequency domains. For this reason, a Peak Energy Criterion (PEC) is proposed in order to tune the relevant wavelet window by choosing simultaneously in an optimal way and automatically both the center frequency and the bandwidth. A number of application cases are presented and the criterion demonstrates excellent behavior as it combines the benefits of energy based criteria, with criteria characterizing the spikiness of the response.
展开▼
