Use of Lower Harmonics of Pressure Oscillations for Blockage Detection in Liquid Pipelines
Publication: Journal of Hydraulic Engineering
Volume 145, Issue 3
Abstract
The transfer matrix method was applied to detect partial blockages in liquid pipelines using the first four harmonics of the pressure oscillations produced by sinusoidal opening and closing of a downstream valve. Unlike most available methods, which use a large number of harmonics to analyze the pattern of the frequency response diagram, this study uses only the first few harmonics to investigate the effect of a partial blockage on the amplitude of pressure head oscillations. A relationship between the relative blockage location and the amplitude of the pressure head oscillation was determined for each lower harmonic in the steady-oscillatory flow. The effect of steady and unsteady friction is discussed. The results of the current approach are compared with those obtained in the time domain by using the method of characteristics and with the experimental data reported in the literature; there is a satisfactory agreement.
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Acknowledgments
The authors thank the Higher Committee for Education Development in Iraq (HCED) for awarding a scholarship to the first author in coordination with the University of Basrah, the Ministry of Higher Education and Scientific Research in Iraq (MOHESR) for awarding a scholarship to the third author in coordination with the Northern Technical University, and the Iraqi Cultural Office in Washington, DC, for its continuous support.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 145 • Issue 3 • March 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Sep 28, 2017
Accepted: Aug 31, 2018
Published online: Dec 31, 2018
Published in print: Mar 1, 2019
Discussion open until: May 31, 2019
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