Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
On the effects of reflections on time delay estimation for leak detection in buried plastic water pipes
This paper is concerned with the way in which wave reflections in a fluid-filled pipe affect the cross-correlation function of two leak noise signals used to detect and locate leaks in buried water pipes. Propagating waves generated by leak noise reverberate in a pipe network system, as they encounter features such as changes in section, and resistance such as valves, and pipe junctions. A theoretical model of a straight pipe with discontinuities, which cause reflections, is developed and incorporated into a model of the cross-correlation function. The reasons why the reflections and the low-pass filtering properties of the pipe can be largely removed by the generalised cross-correlation (GCC) phase transform (PHAT) are determined. Using the analytical model, theoretical predictions of the basic cross-correlation function (BCC) and the GCC PHAT are compared with experimental data from a specially constructed test site in Canada.
On the effects of reflections on time delay estimation for leak detection in buried plastic water pipes
This paper is concerned with the way in which wave reflections in a fluid-filled pipe affect the cross-correlation function of two leak noise signals used to detect and locate leaks in buried water pipes. Propagating waves generated by leak noise reverberate in a pipe network system, as they encounter features such as changes in section, and resistance such as valves, and pipe junctions. A theoretical model of a straight pipe with discontinuities, which cause reflections, is developed and incorporated into a model of the cross-correlation function. The reasons why the reflections and the low-pass filtering properties of the pipe can be largely removed by the generalised cross-correlation (GCC) phase transform (PHAT) are determined. Using the analytical model, theoretical predictions of the basic cross-correlation function (BCC) and the GCC PHAT are compared with experimental data from a specially constructed test site in Canada.
On the effects of reflections on time delay estimation for leak detection in buried plastic water pipes
Über den Einfluss von Reflexionen auf die Abschätzung der Verzögerungszeit für die Lecksuche in unterirdischen Kunststoffwasserrohren
Gao, Y. (Autor:in) / Brennan, M.J. (Autor:in) / Joseph, P.F. (Autor:in)
Journal of Sound and Vibration ; 325 ; 649-663
2009
15 Seiten, 14 Bilder, 19 Quellen
Aufsatz (Zeitschrift)
Englisch
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