Analysis of filtering methods of leaky acoustic wave based on blind source separation technology

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (24) : 192-199.

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Analysis of filtering methods of leaky acoustic wave based on blind source separation technology

LiuGuangxiao1, MengLingya2, LiuCuiwei1, QianHaocheng1, LiYuxing1

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Abstract

In the natural gas pipeline leak detection field, acoustic leak detection technology has the advantage of high sensitivity, strong real-time and high accuracy of leakage location. Acoustic method is limited by wave filtering technology and has not been used widely. To solve the problem, the main filtering methods in time and frequency domain was summarized, the typical methods of Wavelet and Wiener filtering was chosen, the principle of the two methods was listed, the actual filtering effect was studied. Filtering methods cannot attain satisfying effect under some situations, the reason is explained and the shortcoming of filtering methods was analyzed. A rapidly developing method-the blind source separation technology was introduced, the theory of signal separation was discussed. By separating structured signals, the blind source separation technology was proved to have better applicability and filtering effect. The separating results of experimental leaky acoustic wave indicates this technology has practical application value.

Key words

Acoustic leak detection technology / wavelet filtering / Wiener filtering / blind source separation.

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LiuGuangxiao;MengLingya;LiuCuiwei;QianHaocheng;LiYuxing. Analysis of filtering methods of leaky acoustic wave based on blind source separation technology[J]. Journal of Vibration and Shock, 2014, 33(24): 192-199