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http://dx.doi.org/10.5050/KSNVE.2010.20.6.568

Comparison of Window Functions for the Estimation of Leak Location for Underground Plastic Pipes  

Lee, Young-Sup (인천대학교 임베디드시스템공학과)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.20, no.6, 2010 , pp. 568-576 More about this Journal
Abstract
It is widely known that the leak locating of underground plastic pipelines is much more difficult than that of cast iron pipelines. The precision of the leak locating depends upon the speed of leak signal and the time delay estimation between the two sensors on the pipeline. In this paper, six different windowing filters are considered to improve the time delay estimation especially for the plastic pipelines. The time delay is usually estimated from the peak time of cross-correlation functions. The filtering windows including rectangle, Roth, Wiener, SCOT, PHAT and maximum likelihood are applied to derive the generalized cross-correlation function and compared each other. Experimental results for the actual plastic underground water supply pipeline show that the introduction of the filtering windows improved the precision of time delay estimation. Some window functions provide excellent leak locating capability for the plastic pipe of 98 m long, which is less than 1 % of the pipe lengths. Also a new probabilistic approach that the combinations of all results from each filtering window is suggested for the better leak locating.
Keywords
Leak Location Detection; Time Delay Estimation; Cross-correlation Function; Window Function; Plastic Pipe;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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