舱内液体对VLCC舷侧结构碰撞性能的影响

以300kDWT超大型油轮(VLCC)货舱区舷侧结构为研究对象,利用有限元软件MSC.Dytran对该VLCC在满载和压载工况下的碰撞损伤机理及耐撞性能进行研究,通过对碰撞过程中液货与结构之间的流-固耦合力、碰撞力、结构变形、结构吸能等进行计算分析,并将这些参数与空载工况下的计算结果进行了对比分析,阐述舱内液体对结构损伤机理及碰撞性能的影响。研究表明,舱内液货对VLCC舷侧结构碰撞后期的损伤变形、碰撞力等产生一定影响,对整体碰撞性能影响较小;压载水对结构的损伤机理、耐撞性能均产生显著影响,结构的变形模式发生明显改变,碰撞力显著增大,系统吸能大幅增加,其耐撞性能显著提高。

Effects of liquid cargo on side structure behaviors of a VLCC in collision

Thedouble-sidedstructureofaverylargecrudecarrier(VLCC)cargoholdwaschosenastheresearchobject.Thenonlinearfiniteelementcode,MSC.Dytranwasappliedtoinvestigatenumericallythecollisiondamagemechanismandcrashworthinessofthisstructureunderfullloadandballastconditions.Andthecorrespondingparameters,includingfluid-structureinteractionpressure,collisionforce,deformationandenergyabsorbing,werecomputedandcomparedwiththeresultsunderlightloadconditions.Theresultsshowthattheliquidcargoaffectstoacertainextentthestructuraldamagedeformationandcollisionforceinthelaterstageofcollisinbutinfluencesweaklythewholecrashworthinessofthisstructure.Ballastwaterhasremarkableeffectondamagemechanism,crashworthinessperformanceanddeformationpatterns.Thefluid-structureinteractionforcecancausesignificantchangesindeformationpatterns,remarkableincreaseinimpactforceandenergyabsorption,evidentimproveincrashworthiness.