Pinpointing of Leakage Location Using Pipe-fluid Coupled Vibration

이영섭,; Jin, Yoon Dong

doi:10.5050/ksnvn.2004.14.2.095

Transactions of the Korean Society for Noise and Vibration Engi

2004

DOI: 10.5050/ksnvn.2004.14.2.095

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Pinpointing of Leakage Location Using Pipe-fluid Coupled Vibration

이영섭 이영섭¹,

Yoon Dong Jin²

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Cited by 6 publications

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Effects of windowing filters in leak locating for buried water-filled cast iron pipes

Lee

2009

J Mech Sci Technol

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Arrival time difference or time delay estimation is critically important for detection of leak location in buried water supply pipes. Because the exact leak locating depends upon the precision of the arrival time difference estimation between leak signals measured by sensors and the propagation speed of the leak-related elastic wave, the research on the estimation of time delay has been one of the key issues in leak locating. The arrival time difference was estimated with the peak time of cross correlation functions of the measured signals. In this study six different window functions, including the basic rectangular, Roth, Wiener, SCOT, PHAT and maximum likelihood windows were applied. Experimental results against an actual buried pipe made of cast iron showed that the introduction of the window functions improved the precision of time delay estimation. In this paper, a new statistical approach, that combines all results of each window function, is suggested for better leak locating. Apart from the experiment, an intensive theoretical analysis in terms of signal processing is described.

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Effects of windowing filters in leak locating for buried water-filled cast iron pipes

Lee

2009

J Mech Sci Technol

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The leak signal characteristics and estimation of the leak location on water pipeline

Park¹,

Kim²,

Seo³

et al. 2018

J. Korean Soc. Water Wastewater

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A Basic Experimental Study on Analysis of Leak Signal and Monitoring Method for Water Supply Pipe

Kim¹,

Jung²,

Ryou

et al. 2021

Applied Sciences

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Water supply systems are essential elements for human life and industry, and water leaks and water supply cut-off may cause major problems. Local water leaks and pipe failures in the water supply system are inevitable problems due to the aging of pipes. Therefore, leakage detection and prevention are required to monitor the integrity of the water supply system. This paper is a fundamental study on the applicability of the smart bolt, which was developed as a monitoring system to detect water leakage in water supply monitoring. Detection experiments were conducted using a smart bolt with a built-in strain sensor and an accelerometer. Through finite element analysis using ANSYS 2019 R2 and tensile strength testing, the strength of the smart bolt was confirmed to have the acceptable tensile strength. The smart bolt used in this study was verified to meet the allowable criteria of torque and tensile stress for a municipal water supply system. The frequency responses of the simulated leakage pipe system, according to the leakage of the valve and the main pipe, were analyzed, and a leak signal at the valve leak point was detected in the 60-Hz band. The main pipe leaking point was observed to produce a leak signal with a much higher-order mode than that of the valve leak point. Therefore, the smart bolt can be applied to detect warning leak signs from water supply valves and to monitor for loosening of the bolts.

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Pinpointing of Leakage Location Using Pipe-fluid Coupled Vibration

Cited by 6 publications

References 5 publications

Effects of windowing filters in leak locating for buried water-filled cast iron pipes

Effects of windowing filters in leak locating for buried water-filled cast iron pipes

The leak signal characteristics and estimation of the leak location on water pipeline

A Basic Experimental Study on Analysis of Leak Signal and Monitoring Method for Water Supply Pipe

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