Research on the location of the micro pressure pipeline leak based on the EMD and wavelet packet
WANG Jianguo
LIU Pengzhen
WANG Shaofeng
GAO Lin
Abstract：In order to de-noise acoustic emission signal generated by crack of the pressure pipeline micro leakage and locate the leakage source accurately,the acoustic emission signal noise of the micro leakage source is processed based on the method of empirical mode decomposition (EMD) and wavelet packet transform.Results show that the method can solve the problem of reduction the continuous acoustic emission signal noise.Firstly,EMD was used to decompose the acoustic emission signal of the leakage source to refine the details of the high frequency background noise signal in the leakage source signal,and then based on the correlation degree of the EMD decomposition of each intrinsic mode function (IMF) and the original signal,the IMF that contains the mainly characteristics of source signal is determined.Meanwhile,de-noising and EMD refactoring is done by using the wavelet packet to further weaken the background of high frequency noise interference.Finally,the signal is made to de-noised and reconstructed and do cross-correlation calculation.The accurate positioning of the press pipeline of the leakage source is achieved.
Keywords：pressure pipingmicro leakageacoustic emission signalsthe wavelet packetEMD
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 83-88 )