简介：Thesimulationofthewholeship-bridgecollisionprocesscanbeeffectivelycarriedoutbynonlineardynamicfiniteelementmethod.Basedonthesimpledescriptionofthetheory,ascenarioofa40000DWToiltankercollidingwithabridgeacrosstheYangtzeRiverisdesignedforsimulation.Thetechnologyofstructuremodelingandthedeterminationofrelatedparametersareintroduced.Thedeformationofthebulbbow,thehistoryofcollisionforcechange,theexchangeofcollisionenergyandthestressdistributionofthebridgepieraredescribedindetail,whichareofgreatvaluetobridgede-signandbridgepierdamageestimation,Somemechanicalcharactersintheprocessofship-bridgecollisionaredescribed.Moreaccurateresultscanbeproducedbyfiniteelementmethodthanthatbyempiricalformulasandsimplifiedanalyticalmethods.

简介：Inthepresentstudy,theformulacalculatingshipimpactforcesonlightwharfstructuresispresentedwhentheelasticdeformationofthehullandthepierstructuresaswellasthenonlineardeformationofthefenderaretakenintoaccount.TheshipimpactforcesarestatisticallyanalyzedwiththeMonte-Carlomethodaccordingtotheknownprobabilitydistributiontypesofrandomvariables.Basedonthesimulatedresults,thedistributionofshipimpactforceswhichischaracterizedbybimodaldistributioncanbeexpressedasthecombiningprobabilitydensityfunctionofbetadistributionandnormaldistribution.Thecorrespondingparametersoftheprobabilitydensityfunctioncanbeestimatedwiththemaximumlikelihoodmethod.TheresultsshowthatshipimpactforcesonlightwharfstructuresfollowthedistributionoftypeIextremevalue.Themeancoefficientandvariationcoefficientare1.11and0.008respectivelyduring50yearsofdesignreferenceperiod.

简介：在常规波浪的轮船漂浮状况是计算的。漂浮的轮船调节的新方程控制任何东西被向量操作的使用建议。这种形式是能与经常的系数用惩罚功能方法被解决的一个非线性的优化问题。并且解决的过程被两分加速。在解决的过程期间，轮船排水量和快活的中心被轮船表面的集成根据吃水线计算了。轮船表面用一个积聚的弦长度理论被描述以便决定排水量，快活中心和吃水线。在每个车站形成吃水线的风能被计算轮船表面和波浪表面的交叉发现。一个例子的结果显示这个方法准确、有效。漂浮能计算轮船在常规波浪调节以及简化计算并且改进计算效率和结果的精确。

简介：作为一艘轮船的可操作性，近遨游到一个银行被sidewall影响，对调遣稳定性的轮船的评价是重要的。平面运动机制(PMM)测量的水动力学衍生物测试提供一个方法预言轮船可操作性的变化。这份报纸由使用不稳定的RANS方程与变体距离介绍PMM模型测试的数字模拟给一个垂直银行。一种混合动态网孔技术被开发认识到网孔配置并且当轮船接近银行时，动态PMM测试重新协调。建议方法被把数字结果与一条传播的水隧道的PMM测试的结果作比较验证。轮船的一阶的水动力学衍生物从侧面的力量的时间历史被分析并且偏航时刻根据多重跑的模仿过程和有ship-sidewall距离的水动力学衍生物的变化被给。直线稳定性和方向性的稳定性也被讨论并且稳定或不稳定的地区比例衍生物(PD)为方向性的稳定性的控制器参数被显示出，它能是为当航行在一条河岸附近时，保留操作的路线的引用。

简介：轮船的Ince-Strutt稳定性图表在不规则的波浪的参量的转动回声在不规则的波浪为参量的转动回声的探索被进行并且利用。参量的转动回声将导致的轮船大振幅转动运动甚至失事。第一，在不规则的波浪描述参量的转动回声的方程根据Grims有效理论被导出，相应Ince-Strutt稳定性图表被获得。第二，为在不规则、常规的波浪的参量的转动回声的稳定性图表的差别被比较。第三，波浪阶段和高峰时期被考虑获得一个更现实主义的海条件。当分析的点在不稳定性边界附近被定位时，随机的波浪阶段的影响应该被考虑。为不同波浪高峰时期的稳定性图表是各种各样的。稳定性图表对在设计舞台的参数决心有用更好适应驾驶状况。最后，轮船变量被一条统计途径根据稳定性图表分析。metacentric高度的增加将帮助改进轮船稳定性。

简介：Thispaperpresentsthetestofashipmodelforthedesignofabackward-bentductoscillatingwatercolumntypewaveenergyconversionsystem,tosupplyelectricpowerforalightship.Thissystemsuggestsanewwaytoproduceelectricpowerautomaticallyforlargelightships.

简介：Inordertoanalyzetheice-goingship’sperformanceunderthepackiceconditions,syntheticicewasintroducedintoatowingtank.Abarrierusingfloatingcylinderinthetowingtankwasdesignedtocarryouttheresistanceexperiment.Thetestresultsindicatedthattheencounteringfrequencybetweentheshipmodelandthepackiceshiftstowardsahigh-velocitypointastheconcentrationofthepackiceincreases,andthisencounteringfrequencycreatesanunstableregionoftheresistance,andtheunstableregionshiftstothehigherspeedwiththeincreasingconcentration.Theresultsalsoshowedthatforthesamespeedpoints,theratioofthepackiceresistancetotheopenwaterresistanceincreaseswiththeincreasingconcentration,andforthesameconcentrations,thisratiodecreasesasthespeedincreases.Motioncharacteristicsshowedthatthemeanvalueoftheheavemotionincreasesasthespeedincreases,andthepitchmotiontendstoincreasewiththeincreasingspeed.Inaddition,thetotalresistanceofthefullscalewaspredicted.

简介：WhiletheAntarcticSlopeCurrent(ASC)hasbeenintensivelystudiedfortheEastAntarcticaslopeareaandtheWeddellSea,itsfateinthewesternAntarcticPeninsula(WAP)regionremainsmuchlessknown.DatafromtwocruisesconductedneartheSouthShetlandIslands(SSIs)andtheElephantIsland(EI),oneinaustralsummerof2004andoneinaustralwinterof2006,wereanalyzedtoprovideabroadpictureofthecirculationpatternoverthecontinentalslopeofthesurveyedarea,andaninsightintothedynamicalbalanceofthecirculation.Theresultsindicatethatsouthwestwardcurrentsarepresentovertheupperslopeinthestudyarea,indicatingtheASCintheWAPregion.NeartheShackletonGap(SG)northoftheEI,thesouthwestwardslopecurrentsneartheshelfbreakarecharacterizedbyawatermasscolderandfresherthantheambientwater,whichproducescross-slopedensitygradientsandthenverticalshearofthealong-slope(oralong-isobath)velocity.Theverticalshearisassociatedwithareversalofthealong-slopecurrentfromnortheastwardatsurfacetosouthwestwardindeeperlayers,oradepth-intensificationofthesouthwestwardslopecurrents.ThewatermasswithtemperatureandsalinitycharacteristicssimilartotheobservedcoldandfreshwaterisalsorevealedonthesouthernslopeoftheScotiaSea,suggestingthatthiscoldandfreshwaterisoriginatedfromtheScotiaSeaslopeandflowssouthwestwardthroughtheSG.OvertheshelfnorthoftheSSIs,thecoldandfreshwatermassisalsoobservedandoriginatesmainlyfromtheBransfieldStrait.Inthisarea,verticalstructureofthesouthwestwardslopecurrentsisassociatedwiththeonshoreintrusionoftheupperCircumpolarDeepWaterthatcreatescross-slopedensitygradients.