Novel Leak Detector Based on DWT an Experimental Study
(1) * Sabir Meftah Mail (Mohamed Boudiaf University, Algeria)
(2) Miloud Bentoumi Mail (Mohamed Boudiaf University, Algeria)
(3) Dirman Hanafi Burhanuddin Mail (Universiti Tun Hussein Onn Malaysia, Malaysia)
(4) Haddi Bakhti Mail (Mohamed Boudiaf University, Algeria)
(5) Chaima Chabira Mail (Mohamed Boudiaf University, Algeria)
*corresponding author

Abstract


We always face water leakage problems in underground distribution water networks (DWNs). Existing leak detectors suffer from false alarms due to poor leak signal quality affected by external noise, often collected by acoustic or vibratory sensors. This paper introduces a novel Discrete Wavelet Transform Detector (DWTD) that leverages precise pressure signals non-influenced by environmental noise. Using a prototype of a 100m PEHD pipeline and a diameter of 40mm, Data from two pressure transmitters were collected using a dSPACE MicroLabBox unit. The main idea is to apply the Discrete Wavelet Transform (DWT) with a DONOHO threshold law to cancel noises due to water turbulence fluctuations, ensuring high-quality signals for accurate leak detection and localization. As benchmarks to assess the quality of denoising signals three parameters were calculated, Signal to Noise Ratio (SNR > 26.6763 dB), Normalized Cross-Correlation (NCC≈1), and Mean Square Error (0.20573 < MSE < 48.4761). The denoised temporal signals are obtained from the Inverse Discrete Wavelet Transform (IDWT). A Cross-correlation is employed to these signals to determine the leak’s location. The experimental validation involves positioning the first and second transmitters at specific distances on both sides of the leak position. This allows for comparison between the actual leak position in advance known and calculated positions at various points and leak sizes. With only a few exceptions where the maximum error rate reached 5 meters from the actual leak position, the detector's effectiveness was proven across tests involving four different leak sizes.

Keywords


Leak; Pressure Signal; DWT; DONOHO Threshold; Detector

   

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https://doi.org/10.31763/ijrcs.v4i3.1458 		      

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