Fatigue Analysis of the Taut-Wire Mooring System Applied for Deep Waters

Abstract：Precisely predicting the fatigue life of taut-wire mooting systems has become an interesting and important problem for scientists and engineers since there are still difficulties in the inspection and maintenance of mooting lines in a rough sea environment especially in deep waters.In this paper,a comprehensive fatigue analysis is performed for a polyester taut-wire mooring system of an FPSO based on the time domain dynamic theory,rainflow cycle counting method and linear damage accumulation rule of Palmgren-Miner.Three influential factors in the fatigue analysis including the pre-tension,dynamic stiffness and T-N curve are investigated in detail.Two polyester T-N curves,one is from the DNVOS-E301 and the other is from the API-RP-2SM,are adopted in the calculation.The fatigue analysis of the mooring system after one-line failure is also carried out.The calculation results indicate that the fatigue life is significantly affected by the T-N curve.The fatigue life decreases with increasing pre-tension,and is largely reduced if taking into account the dynamic stiffness caused by cyclic loading.The analysis also proves that one-line failure has remarkable effects on the fatigue lives of other mooring lines.The present parametric and comparative study is believed to be meaningful to further understanding of the taut-wire mooring system for deepwater applications. 作者： Author： HUANG Wei  LIU Hai-xiao  SHAN Gui-min  HU Cun 作者單位： School of Civil Engineering, Tianjin University, Tianjin 300072, China 期 刊： 中國海洋工程（英文版）   ISTICEISCI Journal： China Ocean Engineering 年，卷(期)： 2011, 25(3) 分類號： U653.2 Keywords： taut-wire mooring system    fatigue analysis    T-N curve    dynamic stiffness    pre-tension    one-line failure    機標分類號： P7 TV1 機標關鍵詞： Deep    Mooring System    fatigue analysis    mooring system    fatigue life    dynamic theory    comparative study    sea environment    understanding    difficulties    time domain    maintenance    interesting    inspection    especially    decreases    results    factors    account    paper 基金項目： Fatigue Analysis of the Taut-Wire Mooring System Applied for Deep Waters[期刊論文]  中國海洋工程（英文版） --2011, 25(3)Precisely predicting the fatigue life of taut-wire mooting systems has become an interesting and important problem for scientists and engineers since there are still difficulties in the inspection and ...

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