Fatigue life prediction of mooring chains for a floating tidal current power station

Abstract

As a kind of clean and renewable energy, tidal current energy is becoming increasingly popular all over the world with the shortage of energy and environmental problems becoming more and more severe. A floating tidal current power station is a typical type of tidal current power transformers which can sustain the loads of wind, waves, and current, and even the extreme situation of a typhoon. Therefore, the mooring system must be reliable enough to keep the station operating normally and to survive in extreme situations. The power station examined in this paper was installed at a depth of 40 m. A 44 mm-diameter R4-RQ4 chain was chosen, with a 2 147 kN minimum break strength and 50 kN pretension. Common studless link chain was used in this paper. Based on the Miner fatigue cumulative damage rule, S-N curves of chains, and MOSES software, a highly reliable mooring system was designed and analyzed. The calculation results show that the mooring system designed is reliable throughout a 10-year period. It can completely meet the design requirements of American Petroleum institution (API). Therefore, the presented research is significant for advancing the design of this kind of power station.

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References

  1. API Recommend Practice 2P (1987). Analysis of spread mooring system for floating drilling units. 2nd ed, May, 30–40

  2. API Recommend Practice 2SK (2005). Design and analysis of stationkeeping system for floating structures. 3nd ed, October, 33–42.

  3. Cao Hao (2007). The mooring system design of 130kW floating tidal current power station. Master thesis, Harbin Engineering University, Harbin, 67. (in Chinese) DNV (2005). Anchor manual. 6–9.

    Google Scholar 

  4. Gao Z, Moan T (2006). Wave-induced fatigue damage of mooring chain under combined non-Gaussian low and wave frequency loads. Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering (OMAE), Hamburg.

  5. Geir OH, Moan T (1997). Fatigue and overload reliablility of mooring systems. Proceedings of the International Offshore and Polar Engineering Coference, Los Angeles, 4, 145–152.

    Google Scholar 

  6. Krock HJ (1989). Ocean energy recovery. The American Society of Civil Engineers, New York, 18–23.

    Google Scholar 

  7. Larsen K, Mathisen J (1996). Reliablility-based fatigue analysis of morring lines. Proc First 90 Eur Offshore Mech Symp, 213–220.

  8. Lassen T, Syvertsen K (1996). Fatigue reliability and life cycle cost analysis of mooring chains. Proceedings of the International Offshore and Polar Engineering Conference, Los Angeles, 4, 418–422.

    Google Scholar 

  9. Liu Xiangchun, Feng Guoqing, Ren Huilong (2006). Study on the application of spectral fatigue analysis. Journal of Marine Science and Application, 5(2), 42–46.

    Article  Google Scholar 

  10. Ma Enjian, Li Fenglai (1996). The design and research on multipoint mooring system. The Ocean Engineering, 14, 55–61. (in Chinese)

    Google Scholar 

  11. Memo to API RP 2SK Work Group (2003). Studlink and studless fatigue curve for mooring lines. ExxonMobil Upstream Research Company, 15–21

  12. MOSES Users Manual (1989).

  13. NERL (1997). Renewable data overview. Renewable Energy Annual, 8–12.

  14. The European Commission (1996). The exploration of tidal and marine current energy, Technical Report, 23–31.

  15. Vazquez-Hernandez AO, Ellwanger GB, Sagrilo LVS (1998). Fatigue analysis and reliability of floating production systems mooring lines in deepwater. Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering (OMAE), Lisbon, 7.

  16. Zhang Huanfen (1987). Ocean energy-the future energy. Guangzhou Institute of Energy Conversion. The Fourth Seminar of Energy Resources in China, 1–12. (in Chinese)

  17. Zhang Jian, Ren Huilong, Zhang Lijie (2012). A nonlinear restoring effect study of mooring system and its application. Journal of Marine Science and Application, 11, 74–82.

    Article  Google Scholar 

Download references

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Correspondence to Fengmei Jing.

Additional information

Foundation item: Supported by the National “863” Program (Grant No.2007AA05Z450), the National S&T Program (Grant No.2008BAA15B04), 2010 Ocean Special Funds (Grant No. ZJME2010GC01, No. ZJME2010CY01), Fundamental Research Funds for the Central Universities (GK2010260106), and “111 Project” Foundation (Grant No. B07019) from State Administration of Foreign Experts Affairs of China and Ministry of Education of China.

Fengmei Jing was born in 1982. She is a lecturer of Harbin Engineering University. She is a PhD candidate for ship fluid mechanics. She graduated from the Politechnico di of Milano in August 2008. Her research is focouses on ocean energy and fluid dynamics.

Liang Zhang was born in 1959. He is a professor, PhD supervisor of Harbin Engineering University. He got the British Royal Fellowship in 1997 with professor R. Eatock Taylor. He is amember of the Chinese Society of Naval Architects and Marine Engineers and was a member of Society of Naval Architects and Marine Engineers (USA) in 1993–1998. He is a Observer of the IEA-OES. He has published over 110 papers in the international and domestic journals. His research is focouses on computational fluid dynamics and development and utilization of renewable ocean energy.

Zhong Yang was born in 1989. He is a master candidate of Harbin Engineering University. His current research interest is mooring system analysis of offshore structure.

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Jing, F., Zhang, L. & Yang, Z. Fatigue life prediction of mooring chains for a floating tidal current power station. J. Marine. Sci. Appl. 11, 216–221 (2012). https://doi.org/10.1007/s11804-012-1125-2

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Keywords

  • floating tidal current power station
  • mooring system
  • mooring chain
  • fatigue analysis