Research on application of wavelet denoising into broken wire damage detection of mine steel wire rope

Through introduction into design of damage detection system of mine steel wire rope, the basic principles of wavelet analysis and denoising methods, the evaluation criterion for selecting optimal wavelet basis is given out. Through theoretic analysis on broken wire damage signal characters and wavelet systems of steel wire rope and conversion of specific wavelet basis through Matlab wavelet analysis toolbox, it's found that the effect of extracting the signal characters of broken wire through db4 wavelet basis is most evident. The testing result indicates that the decomposition and reconstruction of broken wire's damage signal characters based on wavelet MRA (multiresolution analysis), the aberrant points, power frequency interference and other numerous noises are eliminated effectively and the deficiency in traditional filtering methods are overcome, thus the reliable basis for quantitative recognition of broken wire signal of mine steel wire rope is laid.