Welsh DSP Estimate and EMD Applied to Leak Detection in a Water Distribution Pipeline
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Date
2019-12
Journal Title
Journal ISSN
Volume Title
Publisher
Université de M'sila
Abstract
This work deals to introduce a new idea inspired from the empirical mode decomposition
(EMD) technique in order to detect a leak in water distribution networks (WDN). Welsh’s
power spectral density (WPSDE) is used to locate the frequency band in which leaks occur.
Leaks produce acoustic and vibration signals propagating along the pipeline, which have
nonlinear and non-stationary characteristics. Hydraulic pressure, the nature and diameter
of the pipe as well as the size of the leak are considered as sources acting on the leakage
signals. The analysis of such leakage signals using conventional methods is limited by the
choice of the narrow bands and cause therefore the loss of useful information. EMD is a
technique that allows the decomposition of a signal in the time domain as stationary
oscillatory signals called intrinsic mode functions (IMFs), which can be processed
separately. Experiments were carried out to verify the validity of the proposed method.
That shows its best performances in detecting leaks. For the localization, we applied the
Short-Time Fourier Transform (STFT) technique that has the potential to locate leaks at
greater distances from a measurement point and proved its efficiency
Description
Keywords
leak, vibration sensor, EMD, WPSDE, detection