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For the problem of denoising incomplete phenomenon appeared in the existing wavelet threshold methods, a new kind of threshold function and denoising method of parameter adjustable wavelet threshold is proposed. The traditional hard threshold and soft threshold wavelet had problems such as continuity and constant deviation. Firstly, to construct a new threshold function and theoretically proves the...
This paper proposes a method for noise removal from power system disturbance signals based on wavelet packet transform (WPT). One of the major problems in detecting disturbances in power system signals is the presence of noise. To enhance the standard WPT technique in processing the noise-riding signals, this paper proposes a noise removal algorithm. The denoising of the signals is performed by applying...
Due to the weak energy and nonstationarity, incipient fault characteristic signals are usually submerged by vibration signals of rotary machine and noise. Based on the multi-resolution feature and time-frequency localization feature of Wavelet Transform, a method to extract fault characteristic signals by decomposing them into corresponding time-frequency segmentations is presented. The noise is attenuated,...
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