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논문 기본 정보

자료유형
학술대회자료
저자정보
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대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2004도 춘계학술대회 강연 및 논문 초록집
발행연도
2004.4
수록면
798 - 803 (6page)

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초록· 키워드

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Leak noise is a good source to identify the exact location of a leak point of underground water pipelines. Water leak generates broadband sound from a leak location and this sound propagation due to leak in water pipelines is not a non-dispersive wave any more because of the surrounding pipes and soil. However, the necessity of long-range detection of this leak location makes to identify low-frequency acoustic waves rather than high frequency ones. Acoustic wave propagation coupled with surrounding boundaries including cast iron pipes is theoretically analyzed and the wave velocity was confirmed with experiment. The leak locations were identified both by the acoustic emission (AE) method and the cross-correlation method. In a short-range distance, both the AE method and cross-correlation method are effective to detect leak position. However, the detection for a long-range distance required a lower frequency range accelerometers only because higher frequency waves were attenuated very quickly with the increase of propagation paths. Two algorithms for the cross-correlation function were suggested, and a long-range detection has been achieved at real underground water pipelines longer than 300m.

목차

Abstract
1. Introduction
2. Leak noise and its propagation
3. Detection algorithms
4. Experiment by acoustic emission
5. Experiment by cross-correlation
6. Conclusions
Acknowledgement
References

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UCI(KEPA) : I410-ECN-0101-2009-550-016016633