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

The Korean Society of Mechanical Engineers (대한기계학회)
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Three-Dimensional Shape Estimation of Beam Structure Using Fiber Bragg Grating Sensors

광섬유 브래그 격자 센서를 이용한 보 구조물의 3차원 형상 추정

  • Lee, Jin-Hyuk (Graduate School of Energy and Environment, Seoul Nat'l Univ. of Science and Technology) ;
  • Kim, Heon-Young (Dept. of Mechanical Engineering, Graduate Schools of Seoul Nat'l Univ. of Science and Technology) ;
  • Kim, Dae-Hyun (Dept. of Mechanical & Automative Engineering, Seoul Nat'l Univ. of Science and Technology)
  • 이진혁 (서울과학기술대학교 에너지환경대학원) ;
  • 김헌영 (서울과학기술대학교 대학원 기계공학과) ;
  • 김대현 (서울과학기술대학교 기계.자동차공학과)
  • Received : 2014.06.10
  • Accepted : 2015.01.22
  • Published : 2015.03.01
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Abstract

Deflection and deformation occur easily in structures with long length, such as bridges and pipelines. Shape monitoring is required for ensuring their structural health. A fiber Bragg grating (FBG) sensor can be used for monitoring a large-scale structure because of its advantage of multiplexing. In this study, FBG sensors were used for monitoring a composite beam structure, and its strains were measured at multiple points. Thereafter, a shape estimation technique based on the strains was studied. Particularly, a three-dimensional shape estimation technique was proposed for accurate structural health monitoring. A simple experiment was conducted to verify the performance of the shape estimation technique. The result revealed that the estimated shape of the composite beam structure was in agreement with the actual shape obtained after the deformation of the specimen. Additionally, the deflection at a specific point was verified by comparing the estimated and actual deformations measured using a micrometer.

교량이나 배관과 같이 긴 길이의 구조물은 처짐 및 변형이 발생하기 쉽다. 이러한 구조물의 건전성 감시를 위해서는 국부적인 물리량 측정뿐만 아니라 전체의 형상 감시가 필요하다. 광섬유 브래그 격자(Fiber Bragg Grating; FBG) 센서는 광섬유에 다수의 센서 적용이 가능하여 대형 구조물 감시에 효과적이다. 본 연구에서는 FBG를 이용하여 구조물의 다점에서 변형률을 측정하고, 이를 바탕으로 구조물 전체의 형상 추정을 위한 연구를 수행하였다. 구조물의 정확한 감시가 가능하도록 3차원의 형상 추정을 연구하고 실험적 검증을 수행하였다. 실험 결과 구조물의 변형에 따른 형상 변화의 추정이 가능함을 확인하였고, 추가로 특정 위치에서의 처짐량을 실제 마이크로미터로 측정한 값과 예측된 값을 비교하여 검증하였다.

Keywords

References

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