Leakage source locating of safety valve based on improved KDE algorithm

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (11) : 277-284.

LI Shuxun1,2, HOU Jianjun1,2, KANG Yunxing1,2, WANG Zhihui1,2

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Abstract

Aiming at the problem of it being difficult to accurately locate tiny leakage holes of safety valve, a leakage source locating method based on improved approximate kernel density estimation (KDE) algorithm was proposed.With this algorithm, firstly, the combination of signal-to-noise ratio (SNR) tracking and coherence test (CT) was introduced to extract the time-frequency support domain less affected by environmental noise and with dominant leakage sound source energy so that the KDE algorithm could be applied in the safety valve leakage source locating.Then, the high frequency aliasing was suppressed by using the frequency division fusion processing, the approximate kernel density function was calculated, and 3-D spectrogram bases of the approximate kernel density function were reduced.Through simulation computing with the software MATLAB, according to the peak value of the improved KDE spectrogram, locating coordinates of safety valve’s leakage source were obtained.The results showed that relative errors of safety valve leakage locating results under working pressures of 0.72 MPa, 0.75 MPa and 0.77 MPa, respectively are all less than 10%; the method of combining acoustic emission testing and improved KDE algorithm can more accurately locate leakage source of safety valve; with increase in working pressure of safety valve, the locating accuracy increases accordingly.

Key words

safety valve / leak source locating / signal-to-noise ratio (SNR) tracking / coherence test (CT) / frequency division fusion processing

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LI Shuxun1,2, HOU Jianjun1,2, KANG Yunxing1,2, WANG Zhihui1,2. Leakage source locating of safety valve based on improved KDE algorithm[J]. Journal of Vibration and Shock, 2021, 40(11): 277-284

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