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DINAME2019
DINAME2019
Comparison of Two Methods of Excitation for Leak Noise Velocity Measurement in Buried Plastic Water Pipes
Submission Author:
Fábio Kroll de Lima , SP , Brazil
Co-Authors:
Fábio Kroll de Lima, Michael Brennan, Fabricio Cesar Lobato de Almeida, Pedro Christian Ayala Castillo, Daniel Henrique de Sousa Obata, Oscar Scussel, Amarildo Tabone Paschoalini
Presenter: Fábio Kroll de Lima
doi://10.26678/ABCM.DINAME2019.DIN2019-0169
Abstract
The detection and location of leaks in underground water distribution pipelines has been one of the major problems faced by water companies. In order to reduce the high rate of water loss, acoustic techniques have been developed to detect and locate leaks. Moreover, the cross-correlation method has produced good results in the estimation of the leak location. This technique uses the estimate of the time delay (cross-correlation) between the signals acquired at two different measurement positions (usually hydrants) together with the speed at which the leak noise propagates (wave-speed) along the pipe. However, there are factors that jeopardize the estimation of such parameters, for example the pipe system dynamics. In recent years, the determination of increasingly accurate values of time delay has been the subject of study by many researchers in the field of leak detection. Although the value of wave-speed is obtained by tabulated values according to the type of material and the length of the pipe, such values do not always correspond to the actual velocity in the pipe section. One way of estimating the velocity of leak noise propagation is to use an external source of excitation to generate vibratory signals in the pipeline section of interest. This article, describes ways to estimate the leak noise velocity along a section of the pipe in a real condition using two different types of sources of excitation. The first one uses an external leak located outside of the section (out-of-bracket excitation) where the sensors are located. The second type of excitation uses an actuator to generate controlled impacts on the pipe system at one of the measurement positions.
Keywords
Leak detection, cross-correlation method, wave-speed estimation
