Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Time Domain Analysis on Deck Wetness of a Caisson Wet-towed in Irregular Waves

불규칙 파랑 중 직접 예인하는 케이슨의 상판침수에 대한 시간 영역 해석

  • Received : 2015.11.10
  • Accepted : 2016.01.23
  • Published : 2016.02.29
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Abstract

A numerical analysis on deck wetness is carried out for a large caisson directly wet-towed by tugs in irregular waves. A constant panel method is used for linear analysis in frequency domain and a statistical post-processing for the deck wetness is presented. Hydrodynamic coefficients obtained from the frequency domain computation are imported for time domain analysis which enables complete modeling for towing equipment, environment, etc. Both frequency and time domain computations over two sea states are performed and comparison is made. In the time domain analysis, towing systems of various arrangements of tugs are investigated from short-term prediction for the largest deck wetness and the number of occurrences of deck wetness.

불규칙 파랑 중에서 직접 예인하는 케이슨의 상판침수에 대한 수치해석을 수행하였다. 패널법을 이용하여 주파수 영역에서의 선형 운동해석을 수행하였고, 통계적 방법을 통해 상판침수를 예측하였다. 시간영역 해석에서는 예인시스템, 환경하중 등을 상세히 구현하여 운동해석을 수행하였고, 상판침수 결과를 주파수 영역에서의 결과와 비교하였다. 또한, 시간 영역 해석에서는 예인선의 수 및 배치에 대한 검토를 수행하여 상판침수 측면에서 예인시스템이 미치는 영향과 운송조건을 고찰하였다.

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References

  1. DNV-RP-C205. (2014). Environmental conditions and environmental loads. Det Norske Veritas. 115-130.
  2. Faltinsen, O. M. (1993). Sea Loads on Ships and Offshore Structures. 23-25.
  3. GL Noble Denton 0031/ND. (2013). Guidelines for float-over installations/removals. GL Noble Denton. 16-21.
  4. Kim, Y.J. (2005). Estimation of impact loads of slamming and green water and its application to design. Bulletin of the Society of Naval Architects of Korea. 42(2), 26-40.(in Korean)
  5. Lee, C.-H. (1995). WAMIT theory manual. MIT.
  6. NATO. (1998). STANAG 4154 (edition 3)-Common procedures for seakeeping in the ship design process.
  7. Nielsen, F.G. (2007). Lecture notes in marine operations. Norwegian University of Science and Technology. 48-56.
  8. NORDFORSK. (1987). Assessment of ship performance in a seaway.
  9. Pan, Z.Y., Vada, T., and Hassen, F.-C. W. (2013). A mesh dependency study for the mean drift forces by pressure integration. Proc. ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. OMAE 2013-10249.
  10. Park, J.C. (2014). Analysis on floating and towing stability for a large caisson. Pusan National University.(in Korean)
  11. Seok, J., Park, J.-C., Heo, J.-K., Kang, H.-Y., Bae, Y.-H., Kim, M.-H., and Kang, Y.-K. (2010). Stability evaluation during transportaion of caisson for breakwater. J. Ocean Engineering and Technology, 24(4), 13-22.(in Korean)
  12. SIMO. (2015). SIMO Theory manual ver. 4.4. Marintek.
  13. Wadam. (2014). Wadam User manual. ver. 9.1. Det Norske Veritas.