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- 2012-12-04
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- 张力
Description: Higher order time-frequency representation introduced the field of mechanical fault diagnosis. Wigner higher order moment spectrum (WHOS) introduced the concept of definition. Wigner higher order moment spectrum of multi-component signal cross terms will produce " false signal" , combined with local wave method, a new method of an inhibitory the WHOS cross items. First of complex signal preprocessing, local wave decomposition method to decompose into a finite number of single component characteristics the basic mode component, and then for each mode component calculated WHOS. This method can effectively inhibit WHOS cross terms of the frequency distribution. Experiment by simulation and the fault of the rotor, Wigner bispectrum, for example, verify the usefulness of the method, provided a new tool for the fault diagnosis feature extraction
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