Fatigue Life Assessment of Top Tensioned Risers Under Vortex-Induced Vibrations  

作　　者：LI Xiaomin GUO Haiyan MENG Fanshun 

机构地区：[1]College of Engineering, Ocean University of China, Qingdao 266100, P. R. China [2]College of Marine Geo-seience, Ocean University of China, Qingdao 266100, P. R. China

出　　处：《Journal of Ocean University of China》2010年第1期43-47,共5页中国海洋大学学报（英文版）

基　　金：supported by the High Technology Research and Development Program of China (863 Program,Grant Nos.2006AA09Z356 and 2007AA09Z313)

摘　　要：The fatigue life of top tensioned risers under vortex-induced vibrations (VIVs) with consideration of the effect of internal flowing fluid on the riser is analyzed in the time domain.The long-term stress histories of the riser under VIVs are calculated and the mean stresses,the number of stress cycles and amplitudes are determined by the rainflow counting method.The Palmgren-Miner rule for cumulative damage theory with a specified S-N curve is used to estimate the fatigue life of the riser.The corresponding numerical programs numerical simulation of vortex-induced vibrations (NSVIV) which can be used to calculate the VIV response and fatigue life of the riser are compiled.Finally the influences of the riser's parameters such as flexural rigidity,top tension and internal flow velocity on the fatigue life of the riser are analyzed in detail and some conclusions are drawn.The fatigue life of top tensioned risers under vortex-induced vibrations （VIVs） with consideration of the effect of internal flowing fluid on the riser is analyzed in the time domain. The long-term stress histories of the riser under VIVs are calculated and the mean stresses, the number of stress cycles and amplitudes are determined by the rainflow counting method. The Palmgren-Miner rule for cumulative damage theory with a specified S-N curve is used to estimate the fatigue life of the riser. The corresponding numerical programs numerical simulation of vortex-induced vibrations （NSVIV） which can be used to calculate the VIV response and fatigue life of the riser are compiled. Finally the influences of the riser＇s parameters such as flexural rigidity, top tension and internal flow velocity on the fatigue life of the riser are analyzed in detail and some conclusions are drawn.

关 键 词：top tensioned riser （TTR） internal flow vortex-induced vibration （VIV） fatigue life 

分 类 号：O346.2[理学—固体力学] TU311.3[理学—力学]