Research on Metal Magnetic Memory Forecasts the Malfunction of Borehole Casing Based on Wavelet Singularity Detection

Metal magnetic memory technique is an effective method to find stress concentration zone of casing. The micro-damage of component is estimated based on the maximal graduate, which is sensitive to noises. Wavelet transform is just localized, which is popularly used in detection and localization of singularity. Using the signal singularity detection theory of wavelet transform, the computation of the methods is presented based on detection of modulus maxima. The singularity of signal can be obtained, and which are used as feature parameters for quantitative recognition. The validity and feasibility of the method is demonstrated by experiment.