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1、第35卷第6期海洋工程Vol.35No.62017年11月THEOCEANENGINEERINGNov.2017文章编号:1005-9865(2017)06-0028-09海洋输流立管耦合动力分析1,21,21,21,21,2刘晓强,余杨,余建星,樊志远,王华昆(1.天津大学水利工程仿真与安全国家重点实验室,天津300072;2.高新船舶与深海开发装备协同创新中心,上海200240)摘要:综合考虑黏性内流以及立管轴向和流向的耦合效应等多种因素对立管动力响应的影响,基于Hamilton原理推导得出海洋立管耦合振动方程,采用Galerkin法进行数值求解。首先分析波流载荷与平台运动联合激励和仅
2、在平台运动作用下立管动力响应的差异,然后讨论黏性内流和顶部张力对立管动力特性和响应峰值的影响。计算结果表明:波流与平台运动耦合作用和仅在平台运动作用下的立管各阶振动模态和振动峰值存在明显差异,波浪和海流对立管的直接作用不可忽略;内流运动黏性会改变立管振型峰值,立管流向一阶固有频率随内流流速增大而减小,流向和垂向振动峰值分别随之增加和减小,但这种影响很有限,且可以通过增大立管顶部预张力来抵消。关键词:海洋立管;动力响应;Galerkin法;非线性梁模型;耦合作用;黏性内流中图分类号:P756.2文献标志码:ADOI:10.16483/j.issn.1005-9865.2017.06.004C
3、oupleddynamicanalysisofmarineriserconveyingfluid1,21,21,21,21,2LIUXiaoqiang,YUYang,YUJianxing,FANZhiyuan,WANGHuakun(1.StateKeyLaboratoryofHydraulicEngineeringSimulationandSafety,TianjinUniversity,Tianjin300072,China;2.CollaborativeInnovationCenterforAdvancedShipandDeep-SeaExploration,Shanghai20024
4、0,China)Abstract:Thevibrationequationofmarineriserwasderivedwithconsiderationofsuchfactorsastheinfluenceofinternalviscousflow,thecoupledin-lineandaxialmotionandsoon,basedonHamiltonprinciple.TheGalerkinmethodwasimplementedforsolvingtheequationandsomeparameterstudieswereconductedthroughnumericaleffo
5、rts.Firstly,thedynamicresponseofriserobtainedundercouplingexcitationofwave,currentandplatformmotionwasanalyzed.Secondly,theinfluenceoftheviscousinternalflowandthetopforcesonthedynamicresponseofriserwasdiscussed.Itisobservedthattheriservibrationmodesandvibrationpeakarefoundtobeverydifferentunderabo
6、vetwoexcitations,sothedirecteffectofwaveandcurrentonthemarinerisercan’tbeignored.Thekinematicviscosityoftheinnerflowcanchangethemodepeakvalueoftheriser.Withtheincreaseofinternalflowvelocity,thefirstordernaturalfrequencyofriserandthepeakvalueofaxialdisplacementdecrease,andthepeakvalueofin-linedispl
7、acementincreases.Buttheeffectislimited,increasingtoppre-tensionoftherisercancounteractthiseffect.Keywords:marineriser;dynamicresponse;Galerkin’smethod;nonlinearbeammodel;couplingaction;viscousinternalflow海洋立管是海洋油