numerical+estimation+of+roll+damping+and+prediction+of+ship+motions+using+strip+theory

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1、NUMERlCALESTIMATIONOFROLLDAMPINGANDPREDICllONOFSHlPMOTlONSUSINGSTRIPTHEORYII摘要本文包括三部分。第一部分主要是基于切片法的船舶水动力数值预报，包括采用二维频域格林函数获得剖面水动力系数，三维辐射水动力系数、兴波阻尼和波浪力(矩)的获得等。论文第二部分，采用了由池田良穗提出的横摇阻尼经验公式和在该经验公式基础上拟合得到的新的船舶横摇阻尼估算公式进行横摇阻尼预报。在池田良穗提出的经验公式中，横摇阻尼分为了摩擦阻尼、兴波阻尼、兴涡阻尼、升力阻尼、舭龙骨阻尼五个分量。本文最

2、后一部分，对数学船型WigleyI的垂向运动，一条原油运输船的水平运动进行了数值计算，结果同模型试验结果进行了比较，两者符合较好。数值结果比较分析表明本文所采用的切片理论方法准确、稳定、计算效率高，是船舶设计和船行路径优化的一个实用工具。关键词：耐波性：船舶运动：横摇阻尼：池田良穗方法rNUMERICALESTIMATIONOFROLLDAMPINGANDPREDICTIONOFSHIPMOTIONSUSINGSTRlP1HEORYAbstractThispaperconsistsofthreepaas．Inthefirstpart，pre

3、dictofhydrodynamicsbasedonlinearstriptheory(STF)forobtainedthethreedimensionaladdedmass，dampingandalsotheexcitingforcesandmomentswhereFrankclose-fitmethodisusedtogetthetwodimensionalhydrodynamiccoefficients．IIlthesecondpartofthispaperweestimatedampingcoefficientswithorigin

4、alIkedamethodandthenewpredictionmethod(,proposedbyIkeda)．Dampingcoefficientisbrokendownintovariouscategoriessuchasfriction，wavemaking，eddymaking，lift，andbilgekeel·Influenceofforwardspeedisalsocarriedinthispaper．InthelastpartWeobtainedtheverticalmotionssuchUSheaveandpitchmo

5、tionsforWigleyIandalsohorizontalmotionssuchassway，rollandyawmotionsforaCrudeOilCarrier”Maeoma”andcomparealltheoreticalresultswithexperimentalresults．Theresultsobtainedshowgoodagreementwithpreviouscomputationalandexperimentalresults·Themethodusedisaccurate，robust，verycomput

6、ationallyandefficient．Itiswellsuitedtobeusedasatoolinshipdesignoraspartofapathoptimizationmodel．●，，Keywords：Seakeeping；Striptheory；Shipmotions；Rolldamping；IkedamethodCHAPTER1lNTRODUCTION1．1Introduction1INTRODUCTIONTherearevariousaspectstoshipdesign，suchasstrength，stability

7、，resistanceandpropulsion，seakeeping，manoeuvringandcontrols．Toolsandtechniquesareavailabletoassessthequalitiesorcharacteristicsofthesecomponents，butveryfewofthemoverlapandtakeothercomponentsintoconsideration．Thereare“total’’designpackageswhichestimatealloftheseaspectsatthem

8、ostprimitivelevelandofferawell—balanceddesign．Incertaincases，itisperhapsunnecessaryorimpr