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Fatigue Life Assessment of Top Tensioned Risers Under Vortex-Induced Vibrations 被引量:11
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作者 LI Xiaomin GUO Haiyan MENG Fanshun 《Journal of Ocean University of China》 SCIE CAS 2010年第1期43-47,共5页
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 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. 展开更多
关键词 top tensioned riser (TTR) internal flow vortex-induced vibration (VIV) fatigue life
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Numerical Prediction of Vortex-Induced Vibrations on Top Tensioned Riser in Consideration of Internal Flow 被引量:15
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作者 郭海燕 李效民 刘晓春 《China Ocean Engineering》 SCIE EI 2008年第4期675-682,共8页
In consideration of the effect of the internal flowing fluid and the external marine environmental condition on the vortex-induced vibration (VIV) of top tensioned riser (Till), the differential equation is derive... In consideration of the effect of the internal flowing fluid and the external marine environmental condition on the vortex-induced vibration (VIV) of top tensioned riser (Till), the differential equation is derived based on work-energy principles and the riser near wake dynamics is modeled by Facchinetti' s wake oscillator model. Then Galerkin' s finite element approximation is implemented to derive the nonlinear matrix equation of the coupled equations and file corresponding numerical programs are compiled which solve the coupled equations directly in the time domain. The comparison of the predicted results with the recent experimental results and the prediction of SHEAR7 is performed. The results show the validity of the proposed method on the prediction of VIV of deep water risers. The effect of internal flow on the dynamic characteristics and dynmnic response of the riser is analyzed and several valuable conelusions are drawn. 展开更多
关键词 top tensioned riser TTR) internal flow vortex-induced vibration V/V) dynamic characteristics dynamic response
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Stress Analysis of Top Tensioned Riser Under Random Waves and Vessel Motions 被引量:11
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作者 LI Xiaomin GUO Haiyan MENG Fanshun 《Journal of Ocean University of China》 SCIE CAS 2010年第3期251-256,共6页
The bending stresses of top tensioned riser(TTR) under combined excitations of currents,random waves and vessel motions are presented in this paper,and the effect of the internal flowing fluid on the riser stresses is... The bending stresses of top tensioned riser(TTR) under combined excitations of currents,random waves and vessel motions are presented in this paper,and the effect of the internal flowing fluid on the riser stresses is also considered.The computation programs which are used to solve the differential equations in the time domain are compiled and the principal factors of concern including the angular movements at the upper and lower ends of the riser,lateral displacements and bending stresses are presented.Then the effects of current velocity,random wave,top tension,vessel mean offset,low frequency motion and internal flow velocity on the bending stresses of the riser are analyzed in detail. 展开更多
关键词 top tensioned riser (TTR) internal flow vessel motion dynamic response
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Nonlinear Coupled in-Line and Cross-Flow Vortex-Induced Vibration Analysis of Top Tensioned Riser 被引量:4
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作者 李效民 郭海燕 孟凡顺 《China Ocean Engineering》 SCIE EI 2010年第4期749-758,共10页
The fluctuating furces of the fluid exerted on the top terrsioned riser ('FIR) in the in-line and cross-flow directions are both modeled by van del Pol wake oscillator model and the nonlinear coupled dynamics of th... The fluctuating furces of the fluid exerted on the top terrsioned riser ('FIR) in the in-line and cross-flow directions are both modeled by van del Pol wake oscillator model and the nonlinear coupled dynamics of the in-line and cross-flow vortex-induced vibrations (VIV) of the riser are analyzed in time domain in this papar. The numencal shnulation results of the riser's in-line and cross-flow displacements and curvatures are compared with experimental measurements and the comparison shows the validity of this method in modeling some main features of the riser's VIV. Finally, the effects of the riser's top tensions and internal flow velocities on the coupled vibrations of the riser are investigated. 展开更多
关键词 top tensioned riser (TFR) vortex-induced vibration (VIV) wake oscillator model in-line and cross-flowvibration
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Design and Analysis of Tapered Stress Joint for Top Tensioned Riser System 被引量:2
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作者 张日曦 张崎 黄一 《China Ocean Engineering》 SCIE EI 2012年第3期507-520,共14页
Stress Joint (SJ) plays a key role in the Top Tensioned Riser (TTR) system for deep water engineering. A preliminary design method of tapered SJ is proposed in the paper, which could help designers obtain accurate... Stress Joint (SJ) plays a key role in the Top Tensioned Riser (TTR) system for deep water engineering. A preliminary design method of tapered SJ is proposed in the paper, which could help designers obtain accurate design data. After a further sensitive analysis is carried out, the related parameters choice and control methods are recommended in the engineering practice. By taking the extreme environment conditions into consideration, the effects of bending stress reduction and curve control are analyzed, and the 3-D FE models are established by ABQOUS for numerical evaluation to verify the correctness of design results. At last, dynamic analysis and fatigue analysis, based on actual project, are carried out with designed stress joint. The analysis results prove the feasibility and guidance of this method in the practical engineering applications. 展开更多
关键词 stress joint (S J) top tensioned riser (TTR) design method parameters sensitivities dynamic analysis fatigue analysis
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