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CWT-Based Method for Identifying the Location of the Impact Source in Buried Pipes

연속웨이브렛 변환을 이용한 충격음 위치 규명

  • Kim, Eui-Youl (Dept. of Mechanical Engineering, Inha Univ.) ;
  • Kim, Min-Su (Dept. of Mechanical Engineering, Inha Univ.) ;
  • Lee, Sang-Kwon (Dept. of Mechanical Engineering, Inha Univ.) ;
  • Koh, Jae-Pil (School of Mechanical and Aerospace Engineering, Seoul Nat‘l Univ.)
  • 김의열 (인하대학교 기계공학과) ;
  • 김민수 (인하대학교 기계공학과) ;
  • 이상권 (인하대학교 기계공학과) ;
  • 고재필 (한국가스공사 연구개발원)
  • Received : 2009.08.17
  • Accepted : 2010.08.19
  • Published : 2010.11.01

Abstract

This paper presents a new method for indentifying the location of impact source in a buried duct. In a gas pipeline, the problem of leakage occurs due to the mechanical load exerted by construction equipment. Such leakage can cause catastrophic disasters in gas supply industries. Generally, the cross-correlation method has been used for indentifying the location of impact source in a pipeline. Since this method involves the use of the dispersive acoustic wave, it derives an amount of error in process of estimating the time delay between acoustic sensors. The object of this paper is to estimate the time delay in the arrival of the direct wave by using the wavelet transform instead of the dispersive wave. The wavelet transform based method gives more accurate estimates of the impact location than the cross-correlation method does. This method is successfully used to identify the location of impact force in an actual buried gas duct.

Keywords

Continuous Wavelet Transform;Impact Location;Acoustic Wave;Duct;Dispersive Wave

Acknowledgement

Supported by : 한국연구재단

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