Journal of Navigation and Port Research (한국항해항만학회지)

Korean Institute of Navigation and Port Research (한국항해항만학회)
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Study on the Measurement System of Behavior of a Slender Structure using an Underwater Camera which is applied in DOEB

심해공학수조에 적용되는 수중카메라를 이용한 세장체의 연속 거동 측정방법에 관한 연구

  • Jung, Dong-Ho (Korea Research Institute of Ships & Ocean Engineering) ;
  • Kwon, Yong-Ju (Korea Research Institute of Ships & Ocean Engineering) ;
  • Park, Byeong-Won (Korea Research Institute of Ships & Ocean Engineering) ;
  • Jung, Jae-Hwan (Korea Research Institute of Ships & Ocean Engineering) ;
  • Choi, Jong-Su (Korea Research Institute of Ships & Ocean Engineering) ;
  • Cho, Seok-Kyu (Korea Research Institute of Ships & Ocean Engineering) ;
  • Sung, Hong-Gun (Korea Research Institute of Ships & Ocean Engineering)
  • Received : 2017.12.28
  • Accepted : 2018.02.19
  • Published : 2018.02.28
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Abstract

This study covers the selection of systems measuring the behaviour of the slender structure in the underwater environment and its performance assessment. From a comparison of an instrumentation system that can measure the continuous behaviour along the entire length of the slender structure, the underwater camera system is finally selected as the most appropriate semi-permanent measurement system for Deep-sea Ocean Engineering Basin of KRISO. An experiment on the rigid pipes for a basic performance evaluation of the underwater camera is conducted in this study. The motion of a top excited rigid pipe is measured with the utilization of the underwater camera system. The performance of the underwater camera is evaluated by comparing the movement of a pipe measured by the underwater camera with the measured input signals. Through the top excitation experiment for the slender structure, the real-time three-dimensional measurement of the underwater camera system is qualitatively evaluated in this case. The developed underwater camera system can apply to the system to measure dynamic behaviour of a slender structure and mooring line in Deep Ocean Engineering Basin.

본 연구에서는 세장체의 연속적인 거동을 전체 길이에 대하여 측정할 수 있는 계측시스템을 선정하며, 선정된 수중카메라 시스템의 성능평가를 수행한다. 수중카메라의 기초성능평가를 위하여 강체파이프의 강제가진 실험을 수행한다. 파이프의 상단을 강제가진장치에 고정시킨 후, 일정주기와 진폭으로 가진시켜 수중카메라를 이용하여 변위를 측정한다. 강제가진장치에 입력된 신호와 수중카메라에 계측된 신호를 비교하여 측정 정밀도를 평가한다. 연속체인 세장체 파이프의 강제가진 실험을 수행하여, 수중카메라 시스템의 실시간 3차원적인 측정 가능성을 정성적으로 평가한다. 본 수중카메라 시스템은 향후 국내 심해공학수조에 적용되어, 세장체구조물 및 계류선 등의 거동 측정에 활용될 것이다.

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