Research on Complex Three Order Cumulants’ Coupling Features in Fault Diagnosis

Compared with bispectrum, three-order cumulants have a lower computing complexity, and complex threeorder cumulants formally includes different coupling information of signals, in the experiment, through these different coupling modes, features of fault signals and normal signals are fetched by 2-D wavelet in different directions, then these features are used to diagnose fault. The experiment shows that the method can achieve satisfactory result through different selections in fault diagnosis. Compared with the same dimensions of corresponding complex three-order cumulants as the feature extracted by 2-D wavelet, and the real three-order cumulants obtained by the same signals, the results prove that the method in the experiment is effective.