Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
권호 표지
DOI QR코드

DOI QR Code

A Calculation Method of the Ship's Posture Based on the Static Equilibrium for the Refloating Plan of the Stranded Ship

좌초선의 이초 계획 수립을 위한 정적 평형 기반의 자세 계산 방법

  • Lee, Woo-yong (Department of Naval Architecture and Marine Engineering, Changwon National University) ;
  • Ham, Seung-Ho (Department of Naval Architecture and Marine Engineering, Changwon National University) ;
  • Ku, Namkug (Department of Naval Architecture and Ocean Engineering, Dong-eui University)
  • 이우용 (창원대학교 조선해양공학과) ;
  • 함승호 (창원대학교 조선해양공학과) ;
  • 구남국 (동의대학교 조선해양공학과)
  • Received : 2021.10.20
  • Accepted : 2022.01.09
  • Published : 2022.02.20
Download PDF
⟨ Previous Next ⟩

Abstract

A stranded ship means a ship which is stuck on a rock or a seabed, and cannot move by itself. The lightening plan is required to refloat the stranded ship. For this, we have to understand the forces and moments acting on the ship, which is composed of the gravity, buoyancy, and reaction force due to the touched area below the ship. This study defines those forces and moments, and proposed the calculation method to find the posture based on the static equilibrium. It is divided by two steps. In the first step, the magnitude and position of the reaction force are obtained based on the known information such as initial trim angle and draft of the ship. In the second step, the reaction force and the posture is calculated due to the three cases such as addition, reduction, and movement of the cargo. It is applied to three examples in order to calculate the reaction force, and the trim angle due to changes of the cargo. As a results, we successfully obtain the magnitudes and positions of forces acting on the stranded ship and to check the posture of the stranded ship.

Keywords

Acknowledgement

본 연구는 (a) 정부(과학기술정보통신부)의 재원으로 한국연구재단 (No. 2019R1G1A1100187), (b) 2022년도 정부(산업통상자원부)의 재원으로 한국산업기술진흥원 (P0017006, 2022년 산업혁신인재성장지원사업), (c) 2021년도 교육부의 재원으로 한국연구재단의 지원을 받아 수행된 지자체-대학 협력기반 지역혁신 사업 (2021RIS-003)의 지원을 받아 수행된 연구임을 밝히며 이에 감사드립니다.

References

  1. Bartholomew, C.A., 1992. US Navy Salvage Engineer's Handbook. Naval Sea Systems Command, Washington D.C.
  2. Beer, F.P., Johnston, Jr. E.R. & Mazurek, D.F., 2016. Vector mechanics for engineers: static, 11th Ed in SI Units. Translated from English by Han, B.K et al. McGraw-Hill Education Korea, Ltd, Inc.
  3. Byun, S.H. Choi & Chum, T.B., 2001. Calculation of lifting force for a sunken ship considering the bottom soil property. Journal of the Korea Society for marine Environment and Energy, 4(2), pp.135-139.
  4. Choi, K., Lee, S.G., Sohn, K.H. & Shin, M.K., 2000. Calculation of 4 crane lifting force for a sunken ship. Journal of the Korea Society for marine Environment and Energy, 14(1), pp.17-22.
  5. Ham, S.H. et al,, 2015. Physics-based salvage simulation for wrecked ship considering environmental loads. Journal of the Society of Naval Architects of Korea. 52(5). pp.387-394. https://doi.org/10.3744/SNAK.2015.52.5.387
  6. HECSALV, URL: https://www.herbert-abs.com/hecsalv [Accessed 10 April 2021].
  7. Lee, C.S., 2014. A study on the evaluation of lifting force and salvage method of submerged ship. Ph.D. Thesis. Interdisciplinary Program of Ocean Industrial Engineering, Graduate School, Pukyong National University.
  8. Lee, K.Y. et al., 2016. Naval architectural calculation. Textbooks, Inc.
  9. Wilkins, J.R., 2021. U.S. Navy salvor's handbook, Naval Sea Systems Command.
  10. Varsami, A.E., Chircor, M., Popescu, C. & Hanzu-Pazara, R., 2012. Refloating a ship using her own means. Proceedings of the 23rd International Daaam Symposium, pp.0263-0266.