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In this paper, a new adaptive lifting wavelet transform scheme is proposed. The main idea of the scheme is that the choice of predicting operator is triggered by local gradient information of the signal. Such an adaptive scheme can adapt itself well to the analyzed signal, and both the smooth properties and the sharp transition characteristics of the signal can be reserved perfectly by using this...
Partial discharge(PD) signal is used to diagnose the faults of power transformer. But it is often affected by external noise. A method, which can remove narrow-band interference and white noise in PD signal effectively, is put forward. Because the chaotic motion of the duffing oscillator is sensitive to the narrow-band interference signal and immune to the white noise, the method of detecting narrow-band...
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