Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Damage Detection on Thin-walled Structures Utilizing Laser Scanning and Standing Waves

레이저 스캐닝 및 정상파를 이용한 평판 구조물의 손상탐지

  • Kang, Se Hyeok (School of Mechanical Engineering, Chonnam Nat'l Univ.) ;
  • Jeon, Jun Young (School of Mechanical Engineering, Chonnam Nat'l Univ.) ;
  • Kim, Du Hwan (School of Mechanical Engineering, Chonnam Nat'l Univ.) ;
  • Park, Gyuhae (School of Mechanical Engineering, Chonnam Nat'l Univ.) ;
  • Kang, To (Nuclear Convergence Technology Division, Korea Atomic Energy Research Institute) ;
  • Han, Soon Woo (Nuclear Convergence Technology Division, Korea Atomic Energy Research Institute)
  • Received : 2016.11.29
  • Accepted : 2017.01.04
  • Published : 2017.05.01
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Abstract

This paper describes wavenumber filtering for damage detection using single-frequency standing wave excitation and laser scanning sensing. An embedded piezoelectric sensor generates ultrasonic standing waves, and the responses are measured using a laser Doppler vibrometer and mirror tilting device. After scanning, newly developed damage detection techniques based on wavenumber filtering are applied to the full standing wave field. To demonstrate the performance of the proposed techniques, several experiments were performed on composite plates with delamination and aluminum plates with corrosion damage. The results demonstrated that the developed techniques could be applied to various structures to localize the damage, with the potential to improve the damage detection capability at a high interrogation speed.

본 연구에서는 레이저 스캐닝 및 단일 주파수 정상파 가진과 파수 분석을 통해 구조물의 손상을 탐지하는 기법을 개발하였다. 구조물에 부착된 압전소자를 통해 단일 주파수로 가진하고, 이때 발생한 구조물의 정상상태 응답을 레이저 도플러 속도계와 거울 방향조절 장치를 통해 측정하였다. 구조물의 결함을 탐지하기 위해 정상상태 응답에서 파수 필터링을 이용한 손상 탐지 기법을 개발 및 적용하였다. 부식결함이 발생한 알루미늄 평판과 층간 분리가 발생한 복합재료 구조물에 대한 손상 탐지를 수행하여 손상의 위치와 크기를 정확히 파악할 수 있었다.

Keywords

References

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