Improvement of Cross-Correlation Technique for Leak Detection of a Buried Pipe in a Tonal Noisy Environment

Yoon, Doo-Byung; Park, Jinho; Shin, Sung‐Hwan

doi:10.5516/net.09.2011.067

Cited by 16 publications

(1 citation statement)

References 9 publications

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“…It is also very noteworthy that the frequency band (93 Hz to 200 Hz) is similar as the result of "type 2" experiment measured In the absence of leakage (Figure 6a), three prominent spikes (signatures) are realized in the frequency spectrum, 237, 800, and 1597 Hz, respectively. A number of investigations and related studies revealed that these notable signatures occurred as a result of the pump (for example see [45]); which was installed in a test rig near the device launching segment. Therefore, it has generated consistently momentous vibrations.…”

Section: For the Analysis Of Leakage And Related Interfering Noises Smentioning

confidence: 99%

The Free-Swimming Device Leakage Detection in Plastic Water-filled Pipes through Tuning the Wavelet Transform to the Underwater Acoustic Signals

Kumar

Zhu

et al. 2017

Water

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Abstract:The conventional fixed acoustic sensors leak detection methods have been demonstrated to be very practical for locating leakages in water distribution pipelines. However, these methods demand proper installation of sensors, and therefore cannot be implemented on buried long water distribution pipelines for condition assessment, early leak detection, and the estimation of leak size effect. Due to these limitations, a free-swimming device is developed. The free-swimming device with the potential of high acoustic sensitivity is capable of detecting the small underwater leakages in the plastic water-filled pipes. Despite the fact that a number of factors influence the underwater acoustic signals, such as water flow noise. Therefore, the interpretation of the leakage and influence of leakage size is considerably challenging from the underwater measured signals. The new method is proposed for reliable leakage detection by tuning the wavelet transform to underwater water acoustic signals. In this method, firstly, Short-Time Fourier Transforms (STFT) of underwater acoustic signals over a relatively long time-interval is monitored to capture the leakage-signals signature. The captured signals efficiently lead in the selection of mother wavelet (tuned wavelet) for the excellent signal localization in the time-frequency domain. Finally, the acoustic signals are analyzed in the tuned wavelet transform to detect the events. In this paper, the practical application of the proposed method, the controlled experiments are designed, and acoustic signals are collected from an experimental setup by launching the free-swimming device. The measured acoustic signals are used to identify the leakage-signals signature from unwanted interfering signals (instantaneous pipe vibrations, water flow noise, pipe's natural frequencies, and background noise). The evaluation of results validated that the free-swimming device and the tuned wavelet transform together can efficiently lead to reliable underwater leakage detection, as well as the influence of the leakage size in plastic water-filled pipes.

show abstract

Section: For the Analysis Of Leakage And Related Interfering Noises Smentioning

confidence: 99%

The Free-Swimming Device Leakage Detection in Plastic Water-filled Pipes through Tuning the Wavelet Transform to the Underwater Acoustic Signals

Kumar

Zhu

et al. 2017

Water

View full text Add to dashboard Cite

show abstract

Stability improvement of noise analysis method in the case of random noise contamination for subcriticality measurements

Kong

Lee

2014

Annals of Nuclear Energy

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A Novel Monitoring System For Haptic Belt Control To Augment Human-Machine Interaction

2020

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Improvement of Cross-Correlation Technique for Leak Detection of a Buried Pipe in a Tonal Noisy Environment

Cited by 16 publications

References 9 publications

The Free-Swimming Device Leakage Detection in Plastic Water-filled Pipes through Tuning the Wavelet Transform to the Underwater Acoustic Signals

The Free-Swimming Device Leakage Detection in Plastic Water-filled Pipes through Tuning the Wavelet Transform to the Underwater Acoustic Signals

Stability improvement of noise analysis method in the case of random noise contamination for subcriticality measurements

A Novel Monitoring System For Haptic Belt Control To Augment Human-Machine Interaction

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