Journal of the Korean Society for Railway (한국철도학회논문집)

The Korean Society for Railway (한국철도학회)
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Structural Damage Detection by Using the Time-Reversal Process of Lamb Waves and the Imaging Method

Lamb파의 시간-반전과정 및 이미지기법을 이용한 손상탐지

  • 전용주 (인하대학교 공과대학 기계공학과) ;
  • 이우식 (인하대학교 공과대학 기계공학과)
  • Received : 2011.03.17
  • Accepted : 2011.05.16
  • Published : 2011.08.26
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Abstract

This paper proposes a baseline-free SHM technique in which the time-reversal process of Lamb waves and the imaging method are used. The proposed SHM technique has three distinct features when compared with the authors' previously proposed one: (1) It use the reconstructed signal for damage diagnosis, without need to extract the damage signal as the difference between reconstructed signal and initial input signal; (2) It use the imaging method based on the time-offlight information from the reconstructed signal, instead of using a pattern comparison method; (3) In order to make the damage image more clear, the modified mathematical definition of damage image in a pixel is used. The proposed SHM technique is evaluated through the damage detection experiment for an aluminum plate with damage at different locations.

본 연구에서는 Lamb파에 대한 시간-반전과정과 이미지기법을 기반으로 하여 기준 데이터를 사용하지 않는 구조물 건전성 모니터링(SHM) 기술을 제안하였다. 제안된 기술이 갖는 주요 세가지 특징은 다음과 같다: (1) 제안된 기술에서는 귀환신호를 직접 손상진단에 사용하기 때문에 귀환신호와 초기 입력신호의 차이로부터 손상신호를 구할 필요가 없다; (2) 기존의 기술에서 널리 사용되는 형상비교법을 사용하지 않고 귀환신호에서 얻는 비시간 정보를 활용하는 이미지기법을 사용하였다; (3) 손상 이미지를 보다 뚜렷하게 얻기 위하여 이미지에 대한 개선된 수학적 정의를 사용하였다. 본 연구에서 제안한 SHM기술은 손상을 평판의 몇몇 위치에 부가한 경우에 대한 손상탐지 실험을 수행함으로써 검증하였다.

Keywords

References

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