China Ocean Engineering

, Volume 31, Issue 2, pp 141–150 | Cite as

Impact analysis of air gap motion with respect to parameters of mooring system for floating platform

  • Zhong-xiang Shen
  • Fa-li Huo
  • Yan Nie
  • Yin-dong Liu
Article
  • 48 Downloads

Abstract

In this paper, the impact analysis of air gap concerning the parameters of mooring system for the semi-submersible platform is conducted. It is challenging to simulate the wave, current and wind loads of a platform based on a model test simultaneously. Furthermore, the dynamic equivalence between the truncated and full-depth mooring system is still a tuff work. However, the wind and current loads can be tested accurately in wind tunnel model. Furthermore, the wave can be simulated accurately in wave tank test. The full-scale mooring system and the all environment loads can be simulated accurately by using the numerical model based on the model tests simultaneously. In this paper, the air gap response of a floating platform is calculated based on the results of tunnel test and wave tank. Meanwhile, full-scale mooring system, the wind, wave and current load can be considered simultaneously. In addition, a numerical model of the platform is tuned and validated by ANSYS AQWA according to the model test results. With the support of the tuned numerical model, seventeen simulation cases about the presented platform are considered to study the wave, wind, and current loads simultaneously. Then, the impact analysis studies of air gap motion regarding the length, elasticity, and type of the mooring line are performed in the time domain under the beam wave, head wave, and oblique wave conditions.

Key words

mooring system air gap floating platform 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bitner-Gregersen, E.M., 2005. Joint probabilistic description for combined seas, Proceedings of the 24th International Conference on Offshore Mechanics and Arctic Engineering, Halkidiki, Greece, OMAE2005-67382, 169–180.Google Scholar
  2. DNV, 2010. Environmental Conditions and Environmental Loads, DNV-RP-C205, Veritasveien, Norway, Det. Norske Verital AS.Google Scholar
  3. DNV, 2012a. Column-Stabilised Units, DNV-RP-C103, Veritasveien, Norway, Det. Norske Verital AS.Google Scholar
  4. DNV, 2012b. Structural Design of Column Stabilised Units (LRFD Method), DNV-OS-C103, Veritasveien, Norway, Det. Norske Veritas.Google Scholar
  5. Huo, F.L., Zhang, H.X. and Suo, J., 2015. Sensitivity analysis of wave slamming load with respect to wind load for semi-submersible platform design, Journal of Shanghai Jiaotong University (Science), 20(4), 385–394.CrossRefGoogle Scholar
  6. Huo, F.L., Nie, Y., Yang, D.Q., Dong, G. and Cui, J., 2016. Sensitivity analysis of air gap motion with respect to wind load and mooring system for semi-submersible platform design, China Ocean Eng., 30(4), 535–547.CrossRefGoogle Scholar
  7. Kazemi, S. and Incecik, A., 2007. Theoretical and experiment analysis of air gap response and wave-on-deck impact of floating offshore structures, Proceedings of the 26th International Conference on Offshore Mechanics and Arctic Engineering, San Diego, California, USA, OMAE2007-29288, 297–304.Google Scholar
  8. Kazemi, S. and Inceik, A., 2005. Numerical prediction of air gap response of floating offshore structures using direct boundary element method, Proceedings of the 24th International Conference on Offshore Mechanics and Arctic Engineering, Halkidiki, Greece, OMAE2005-67399, 803–809.Google Scholar
  9. Liang, X.F., Yang, J.M., Xiao, L.F., Li, X. and Li, J., 2010. Numerical study of air gap response and wave impact load on a moored semisubmersible platform in predetermined irregular wave train, Proceedings of the ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering, Shanghai, China, OMAE2010-20260, 515–524.Google Scholar
  10. Lwanowski, B. and Wemmenhove, R., 2009. CFD simulation of wave run-up on a semi-submersible and comparison with experiment, Proceedings of the 28th International Conference on Offshore Mechanics and Arctic Engineering, Honolulu, Hawaii, USA, OMAE 2009-79052, 19–29.Google Scholar
  11. Matsumto, F.T., Watai, R.A. and Simos, A.N., 2010. Wave run-up and air gap prediction for a large-volume semi-submersible platform, Proceedings of the 29th International Conference on Offshore Mechanics and Arctic Engineering, Shanghai, China, OMAE2010-20165, 151–159.Google Scholar
  12. Simos, A.N., Sparano, J.V. and Aranha, J.A.P. and Matos, V.L.F., 2008. 2nd order hydrodynamic effects on resonant heave, pitch and roll motions of a large-volume semi-submersible platform, Proceeding of the 27th International Conference on Offshore Mechanics and Arctic Engineering, Estoril, Portugal, OMAE2008-57430, 229–237.Google Scholar
  13. Sweetman, B. and Winterstein, S.R., 2001. Air gap prediction: Use of second-order diffraction and multi-column models, Proceedings of the 14th International Offshore and Polar Engineering Conference, Stavanger, Norway, 390–397.Google Scholar
  14. Winterstein, S., Ude, T.C., Cornell, C.A., Bjerager, P. and Haver, S., 1993. Environmental parameters for extreme response inverse FORM with omission sensitivity, Proceedings of International Conference on Structural Safety and Reliability, Innsbruck, ICOSSAR-93.Google Scholar

Copyright information

© Chinese Ocean Engineering Society and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Zhong-xiang Shen
    • 1
  • Fa-li Huo
    • 2
  • Yan Nie
    • 3
  • Yin-dong Liu
    • 1
  1. 1.Transportation Equipments and Ocean Engineering CollegeDalian Maritime UniversityDalianChina
  2. 2.School of Naval Architecture and Offshore EngineeringJiangsu University of Science and TechnologyZhenjiangChina
  3. 3.Grenland Group (China) Ltd.ShanghaiChina

Personalised recommendations