Transactions of the Korean Society for Noise and Vibration Engineering (한국소음진동공학회논문집)

The Korean Society for Noise and Vibration Engineering (한국소음진동공학회)
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Monitoring Pipe Thinning Using Time-frequency Analysis

시간-주파수 기법을 이용한 배관 감육 감시 방법

  • 손창호 (울산대학교 컴퓨터정보통신공학부) ;
  • 박진호 (한국원자력연구소 기계공학연구부) ;
  • 윤두병 (한국원자력연구소 기계공학연구부) ;
  • 정의필 (울산대학교 컴퓨터정보통신공학부) ;
  • 최영철 (한국원자력연구소 기계공학연구부)
  • Published : 2006.12.20
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Abstract

Pipe thinning is one of the major issues for the structural fracture of pipes of nuclear power plants. Therefore a method to inspect a large area of piping systems quickly and accurately is needed. In this paper, we proposed the method for monitoring pipe thinning. Our basic idea come from that a group velocity of impact wave is different as wall thickness. If the group velocity is measured, wall thickness can be estimated. To obtain the group velocity, time -frequency analysis is used. This is because an arrival time difference can be measured easily in time-frequency domain rather than time domain. To test the performance of this technique, experiments have been performed for a plate and U type pipe. Results show that the proposed technique is quite powerful in the monitoring pipe thinning.

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References

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