@article{ref1,
title="Leak location in gas pipelines by extraction of single non-dispersive mode from leakage-induced acoustic emission signal",
journal="Yi Qi Yi Biao Xue Bao",
year="2017",
author="Yang, Lili and Xie, Haofei and Li, Shuaiyong and Li, Weixiong and He, Mingfeng",
volume="38",
number="4",
pages="969-976",
abstract="The correlation-based leak location errors are large due to the multi-modal and dispersive characteristics of leakage-induced acoustic emission. One kind of leak location in the gas pipelines by extracting the single non-dispersive mode is proposed in this study. The cross-power spectrum of the single modal and non-dispersive component in the leak acoustic emission can be obtained by applying the weighing window with parameters of the wave number of the relative mode. Then, the cross-power spectrum of a single modal and non-dispersive component is analyzed by the inverse Fourier-transformed to acquire the cross-correlation for estimating the time delay. Hence, the acoustic velocity of a single modal and non-dispersive component can be used for calculating the leak position more accurately. The experiments of leak location indicate that the relative error is reduced at least 7%. The reason is the enhancement of correlativity of a single modal and non-dispersive component in leak acoustic emission and the adoption of a more accurate acoustic velocity. It shows that the time-delay estimation by extracting the single-modal and non-dispersive component in the cross-power spectrum of leakage-induced acoustic emission signals will enhance the leak detection and location.  Keywords: Pipeline transportation <p /> <p>Language: zh</p>",
language="zh",
issn="0254-3087",
doi="",
url="http://dx.doi.org/"
}