Research on wavelet basis construction based on the characteristics of acoustic emission signals in gas pipe leakage

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (10) : 128-135.

GAO Lin1,2，CAO Jianguo1,3

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Abstract

As a kind of noise reduction method, wavelet analysis is universally applied in test of pipe leakage. But the wavelet basis functions used are almost general ones which can’t effectively match specific acoustic emission signals of pipe leakage, thereby lowering effects of noise reducing. Aiming at this problem, analogue acoustic emission signals are firstly obtained theoretically by calculation through mathematical analytical model, then based on the analogue signals, wavelet basis suited to the character of pipe leakage is constructed. Utilizing constructed wavelet to reduce the noises of experiment signals and then through cross correlation calculation, the results show that the wavelet basis with vanish moment 3 or 4 and filter support length 8 minimizes the error of leakage localization, only 3.62%. The experimental leakage signals are denoised and cross-correlated by using the constructed wavelet basis and the universal wavelet basis. The results show that the leakage location error is minimum when using the constructed wavelet basis. It shows that the constructed wavelet basis conforms to the basic characteristics of acoustic emission signals in pipe leakage, thereby more effectively suppress noise and reduce the location error of pipe leakage.

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pipe / leakage / acoustic emission / wavelet basis

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GAO Lin1,2，CAO Jianguo1,3. Research on wavelet basis construction based on the characteristics of acoustic emission signals in gas pipe leakage[J]. Journal of Vibration and Shock, 2023, 42(10): 128-135

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