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PS 텐던 강종별 긴장력 변화에 따른 자기 이력 모니터링
유병준 ( Yu Byoung Joon ),김준경 ( Kim Jun Kyeong ),박지환 ( Park Ji Hwan ),박승희 ( Park Seung Hee ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.2
In this paper, an magnetic hysteresis monitoring result for various PS tendon is indtoduced to apply the EM sensing technique to measure the tensile force of PSC bridge. The tensile force of PS tendon is a very important factor in the performance evaluation of PSC bridges. To measure the tensile force of PS tendons, the EM sensing based NDT method was developed but the proposed method cannot be applied to various class of PS tendons. The permeability of specimen was gradually decreased according to increase of tensile force.
능동 스테레오 Depth 카메라 기반 구조물 처짐 추정 방법
신수정(Soojung Shin),이동환(Donghwan Lee),차기춘(Gichun Cha),유병준(Yu Byoung Joon),박승희(Seunghee Park) 한국비파괴검사학회 2020 한국비파괴검사학회지 Vol.40 No.2
구조물의 변위응답은 구조물의 현재 상태 및 안전성을 판단할 수 있는 주요한 지표이다. 본 연구에서는 비접촉식 방법인 Depth Camera를 통해 취득된 데이터를 이용하여 구조물의 수직 변위를 추정하는 방법을 제안하였다. Box 거더에 일정 하중을 가하여 처짐이 발생하면 Active IR Stereo Vision방식의 Depth Camera를 통해 깊이데이터와 적외선데이터를 취득하고 Point Cloud 데이터로 변환하였다. 변환된 데이터는 중앙 부분을 데이터 알고리즘을 통하여 처짐을 추정하였다. 제안한 방법으로부터 추정된 처짐 값과 Linear Variable Differential Transformer(LVDT)로부터 계측된 처짐 값의 비교를 통하여 Depth Camera의 처짐 추정치 정밀도를 검증하였다. LVDT 값과 Depth Camera 값의 상대 오차 값은 ±0.14mm 미만으로 Depth Camera를 사용하여 구조물의 처짐 계측이 가능할 것으로 판단된다. Deflection is a significant indicator of the condition and safety of structures. In this study, an estimation method of structural deflection is proposed using data collected from a non-contact depth camera. When the box girder deflected due to the applied load, depth data was collected using the depth camera through the active infrared stereo vision method. The acquired data was then transformed into point cloud data, and the deflection of the transformed data was estimated through a data algorithm that uses the central part of the structure. The accuracy of the depth camera was verified by comparing the actual values obtained using a linear variable differential transformer (LVDT) with the estimated deflection values obtained using the proposed method. The error between the LVDT value and the depth camera value was less than ± 14 mm. Hence, a depth camera can be used to measure the deflection of a structure.
김주원 ( Kim Ju-won ),박지환 ( Park Ji Hwan ),유병준 ( Yu Byoung Joon ),박승희 ( Park Seunghee ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
In this study, a magnetic flux leakage (MFL) method that is known as a suitable non-destructive evaluation (NDE) method for continuum ferromagnetic members was applied to detect the various types of local damages of the steel wire ropes. 3types of artificial damages, such as cutting, corrosion and compression, were formed on wire rope specimen. A multi-channel MFL sensor head that can maintain the constant lift-off was fabricated to scan the wire rope specimen. The fabricated MFL sensor head measured the magnetic flux signals from the three types of damaged specimens. The capability of damage detection according to damage type was verified from the measured MFL signals from each type of damage. And, the characteristics of the MFL signals were compared and analyzed by type of damage.