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Elasto-Magnetic 센서를 이용한 강재 케이블 국부 단면 감소 손상 탐지
김주원(Ju-Won Kim),남민준(Min-Jun Nam),박승희(Seunghee Park),이종재(Jong-Jae Lee) 한국비파괴검사학회 2011 한국비파괴검사학회지 Vol.31 No.4
강재 케이블 부재는 부식, 파단 등으로 인한 단면손실이 발생할 수 있고, 이로 인한 손상부의 응력 집중으로 인해 시설물 전체의 붕괴로 이어질 수 있는 위험성을 가진다. 따라서 조기에 단면손실을 찾아 사고를 미연에 방지할 수 있는 강재 케이블 비파괴검사 기술이 필수적이다. 이에 본 연구에서는 E/M 센서를 이용한 강재 케이블 모니터링 기술을 제안하고자 한다. E/M 센서(elasto-magnetic sensor)는 본래 케이블의 장력측정을 위해 개발되었지만 본 연구에서는 강재의 국부 단면손상 검색을 위해 적용하였다. 제안된 기술의 실험적 검증을 위해 E/M 센서를 이용하여 4가지의 다른 직경을 가지는 강봉시편을 자화시켜 출력전압을 계측하였고, 그 결과 강봉의 직경이 감소함에 따라 출력전압이 감소함을 보였다. 반복실험을 통해 해상도 및 선형성이 확보되는 최적의 입력전압과 워킹포인트를 선정하였고, 선정된 조건에서 다양한 국부적인 손상이 주어진 강봉시편에서 출력전압을 계측한 결과 손상의 깊이 및 너비가 커짐에 따라 출력전압의 감소가 커짐을 확인하였다. 본 실험을 통해 제안된 E/M 센서를 이용한 강재 케이블 모니터링 기술의 적용가능성을 확인할 수 있었다. The Elasto-magnetic sensor is applied to detect the local cross-sectional loss of steel cables in this study while it was originally developed for measuring the tensile force in the previous works. To verify the feasibility of the proposed damage detection technique, steel bars which have 4-different diameters were fabricated and the output voltage value was measured at each diameter by the E/M sensor. Optimal input voltage and working point are chosen so that the linearity and resolution of results can ensure through repeated experiments, and then the E/M sensor was measured the output voltage values at the damage points of steel bar specimen that was applied the 4 types of damage condition based on the selected optimal experimental condition. This proposed approach can be an effective tool for steel cable health monitoring.
그라운드 앵커 긴장재 손상 검출을 위한 FE 시뮬레이션 기반 EM(Elasto-Magnetic) 센서 설계 및 검증
고동영 ( Ko¸ Dongyoung ),박주영 ( Park¸ Jooyoung ),이창준 ( Lee¸ Changjun ),김승우 ( Kim¸ Seung Woo ),박승희 ( Park¸ Seunghee ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2
A design process considering the electromagnetic characteristics of the materials and target object is essential for fabricating an EM(Elasto-Magnetic) sensor. However, several studies have not considered this. Therefore, in this study, the sensor parameters were initially determined through a finite element (FE) simulation, considering the size and form of an actual ground anchor. Subsequently, an indoor experiment was performed to verify the possibility of detecting tendon damage using a fabricated EM sensor by measuring the electromotive force (EMF). Finally, the experiment results were compared with the FE simulation results.
Yim, Jinsuk,Wang, Ming L.,Shin, Sung Woo,Yun, Chung-Bang,Jung, Hyung-Jo,Kim, Jeong-Tae,Eem, Seung-Hyun Techno-Press 2013 Smart Structures and Systems, An International Jou Vol.12 No.3
Recently, a novel stress sensor, which utilizes the elasto-magnetic (EM) effect of ferromagnetic materials, has been developed to measure stress in steel cables and wires. In this study, the effectiveness of this EM based stress sensors for monitoring of the cable tension force of a real scale cable-stayed bridge was investigated. Two EM stress sensors were installed on two selected multi-strand cables in Hwa-Myung Bridge, Busan, South Korea. Conventional lift-off test was conducted to obtain reference cable tension forces of two test cables. The reference forces were used to calibrate and validate cable tension force measurements from the EM sensors. Tension force variations of two test cables during the second tensioning work on Hwa-Myung Bridge were monitored using the EM sensors. Numerical simulations were conducted to compare and verify the monitoring results. Based on the results, the effectiveness of EM sensors for accurate field monitoring of the cable tension force of cable-stayed bridge is discussed.
임진석,신성우,Ming L. Wang,윤정방,정형조,김정태,음승현 국제구조공학회 2013 Smart Structures and Systems, An International Jou Vol.12 No.4
Recently, a novel stress sensor, which utilizes the elasto-magnetic (EM) effect of ferromagnetic materials, has been developed to measure stress in steel cables and wires. In this study, the effectiveness of this EM based stress sensors for monitoring of the cable tension force of a real scale cable-stayed bridge was investigated. Two EM stress sensors were installed on two selected multi-strand cables in Hwa-Myung Bridge, Busan, South Korea. Conventional lift-off test was conducted to obtain reference cable tension forces of two test cables. The reference forces were used to calibrate and validate cable tension force measurements from the EM sensors. Tension force variations of two test cables during the second tensioning work on Hwa-Myung Bridge were monitored using the EM sensors. Numerical simulations were conducted to compare and verify the monitoring results. Based on the results, the effectiveness of EM sensors for accurate field monitoring of the cable tension force of cable-stayed bridge is discussed.