Characterization of Wire Rope Defects From Magnetic Flux Leakage Signals
Cherdpong Jomdecha, Asa Prateepasen, W. Methong · Thammasat International Journal of Science and Technology · 2003
When using magnetic flux leakage to inspect wire rope, fwo fypes of signals are produced for analysis, nurn.l-y, Lo=calized Fault (LF) and Loss of Magnetic Cross-section Area (LMA)' However, these signals contain a lot of other noises which makes the defects difficult to perfectly analyze. Therefore, this paper rs written to characterize and analyze signals of the wire rope defects obtained from the magnetic flux leakage equipment. The implementation of a wavelet transform is the main goal to chara=cterize the wire iope-inipection signal. The advantages are able to.represent the defect 'i-ocations in time-frequency d-omain based, de-noise and decompose the different frequency constituents. Time and frequency localizations of the defects then can be explored by using the continuous wavelet transform to enhance a visualization of the inspection signal. The discrete wavelet transform is implemented for de-noising as a result of the frequency constituent decompositions.