Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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A Study on Motion Response of Small Fishing Vessels According to Various Tonnage in Regular Waves

소형어선의 크기에 따른 규칙파 중 운동응답 특성에 관한 연구

  • Im, Nam-Kyun (Division of Navigation Science, Mokpo National Maritime University) ;
  • Lee, Sang-Min (Division of Marine Industry Transportation Science and Technology, Kunsan National University)
  • 임남균 (목포해양대학교 항해학부) ;
  • 이상민 (군산대학교 해양산업.운송과학기술학부)
  • Received : 2021.10.08
  • Accepted : 2021.10.28
  • Published : 2021.10.31
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Abstract

Recently, reports of marine accidents of small fishing vessels less than 10 tons have been increasing. In this study, the characteristics of the motion response in regular waves were analyzed using computations for these ships. Small vessels less than 10 tons are classified by size and used for marine accident investigations. Therefore, the motion response analysis was performed on three small fishing vessels of different sizes. In the case of the head sea, it was confirmed that as the speed of the vessel increased in the long wavelength region, the motion responses of heave and pitch became large. The motion response of the smallest 3-ton fishing vessel was greater than that of the other sizes of fishing vessels. The maximum value of the roll motion shifted to the long wavelength region as the speed gradually increased in the bow sea, regardless of the size of the ship. In all the three small fishing vessels, it was found that the roll motion was the greatest at 15 knots, the highest speed in both bow and beam seas. When sailing in the head sea and bow sea conditions, lowering the speed is one of the effective approaches to reduce the effects of the vertical and lateral plane motions. The roll motion caused by the beam wave showed a tendency to increase rapidly only at a specific wavelength regardless of the speed and the size of the vessel. It was confirmed that the roll motion was significantly reduced with forward speed in the stern wave compared to the bow wave. As there is a specific region where the maximum value of the hull motion response appears depending on the size and speed of the ship, an operation method that can minimize the effect of this motion should be considered and implemented.

본 연구는 최근 해양사고가 점차 증가하고 있는 10톤 미만 소형어선의 규칙파 중 운동응답 특성에 대하여 수치해석을 통하여 분석하였다. 10톤 미만의 소형선박들을 크기별로 구분하여 해양사고 분석에 이용되고 있기 때문에 본 연구에서도 서로 다른 크기의 소형어선 3척을 대상으로 운동응답 해석을 이행하였다. 선수파인 경우 장파장 영역에서 속력이 높아질수록 상하동요 및 종동요 응답도 커지고 있는 현상을 확인하였다. 가장 작은 3톤급 어선의 운동응답이 다른 크기의 어선보다 더 크게 나타나는 특성을 보여주었다. 선수사파 상태에서의 횡동요 운동은, 선박의 크기와 관계없이 점차 속력이 높아질수록 운동응답의 최대값이 장파장 영역으로 이동되는 특성을 확인할 수 있었다. 선수사파와 횡파에서 3척의 소형어선 모두 속력이 가장 높은 15노트에서 횡동요 운동이 가장 크게 나타나는 것을 알 수 있었다. 선수파 및 선수사파를 받으면서 항행할 경우 속력을 낮추는 것이 종운동과 횡운동 영향을 감소시킬수 있는 방법이라고 보여진다. 횡파에 의한 횡동요는 속력 및 선박의 크기와 관계없이 특정 파장에서만 급격히 커지는 경향을 보여 주었다. 전진속력이 있을 경우 선수 사파에 비해서 선미사파에서의 확연한 횡동요 감소 현상을 확인할 수 있었다. 선박의 크기 및 속력에 따라 선체운동응답의 최대값이 나타나는 특정 영역이 있으므로 이 운동 영향을 최소화 시킬 수 있는 운항방법이 고려되어 실행되어야 한다.

Keywords

Acknowledgement

본 과제는 행정안전부 지역맞춤형 재난안전 연구개발 사업의 지원을 받아 수행된 연구임(20015029).

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