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《Application of Wavelet Packet Transform in Metal Magnetic Memory Signal Processing 》
ZHANG Xi-yong;ZHANG Yong-xiang;MING Ting-tao
2010, 30 (3):
123-125.
DOI: 10.3969/j.issn.1006-1355.2010.03.032
The metal magnetic memory technique is very effective in early damage detection for metal parts. However, information of disturbing magnetic fields also exists in the magnetic memory signals so that the characteristic signals in the stress concentration area can not be recognized easily. This paper puts forward a new filtering method based on wavelet packet decomposition and reconstruction. Wavelet packet decomposes signals according to different frequency ranges. The goal to filter the disturbing signals can be achieved through intercepting the interested frequency ranges and reconstructing signals. Simulation analysis verifies the feasibility of this method. Then, this method is used to decompose and reconstruct actual magnetic memory signals and a preferable effect is gained. It makes the signal characters in stress concentration area more clear and depresses the probability of damage misjudgment.
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