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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

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.

Acknowledgement

Supported by : 한국연구재단

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