Research on De-noising of Fault Signal Based on Improved Multi-wavelets
1 Air Defense and Antimissile Institute, Air Force Engineering University, Xi’an, 710051, China
2 The 302ed Institute of the Tenth Academy of China Aerospace Science & Industry Corporation ; Guiyang 550009, China
3 School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China
a Corresponding author: email@example.com
Aiming at signal de-noising of fault diagnosis, we need obtain fault signal of high signal to noise ratio with multi-wavelets which need little prior knowledge and are uninfluenced by waveform matching. Here, this paper determines the wavelet basis through contrast experiment, and the decomposition level is confirmed by the principles of making noise fraction from details and making low energy from general picture, threshold is ensured by the method of midpoint optimization. The simulation shows that this method can enhance signal to noise ratio obviously.
© Owned by the authors, published by EDP Sciences, 2016
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