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


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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Corresponding author

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