1、華中科技大學碩士學位論文艦船塔式桅振動特性研究姓名：何慶林申請學位級別：碩士專業(yè)：船舶與海洋結構物設計制造指導教師：趙耀段宏2002.5.3華中科技大學碩士學位論文ABSTRACTIllisthesis1Sapracticeengineeringprojectderivedfromatypeofimportantnavalship’Skey。techniqueitemresearchoftheback—maststaticanddyna

2、micalanalysis，whichasksthefollowingworksbeinvolved：themast’sfigureandstructuralform，thecalculationalloads，thestaticanddynamicanalysisThispapermainlvdescribestheworksOilnatl／lalfrequencyandtheeffectivefactorsWiththeaidoft

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4、ulatedcontinuoussystemnaturalfrequencyaredescribedandanalyzed，meanwhilethecalculafionalmethodsusedinsomerepresentativevesselmastarepresentedBymeansofcomputerFEMsoftwareANSYSafiniteelementmodeloftheback—mastiSgenerate正the

5、generatedmodeltakesintoaccouiltsbothhullandsuperstructure，staticanddynamicalanalysisiScarriedoutThetowermastofnavalship，accordingtOitsfigure，iSsimplifiedtoanonuniformTimoshenkobeamwithelasticsupportingandconcentratemassT

6、heassembletransfermatrixesisformedforthecombinationdynamicsy’stem111enaturalfrequencyoftowermastisderivedbysolutionoffrequencyequationwithsteppingtechniqueanddichotomyComparedwiththeFEM，也emethoddescribedinthepaperiSeffic

7、ientinevaluatingthenaturalfrequencyoftowermastonthephaseofship’sschemedesign111eIl’comparetheresultsoftheauthorwiththatofanothertwocollaboratorsReliabilityanalysisiSinvestigatedby也emethodofstaffstic，andaconclusioniSmade也

8、atthedesignedmastmeets也edemandforapplicationInord盯tofindoutthebasicprinciplesofthewarship’stowermastfactorsrelatedtothenaturalfrequencyⅥ吧realsoproposedinthispaperThatlayafoundationforthefollowingd囂ignphasetectifythestruc

9、tureandschemeFinallyaftertheworksdestinedwerefulfille‘LaccordingtoarecurrequestofequlpmeminshipmastaddtheresearchabouttheharlllOnicresponseofmastvibrationdiscusscdhowtochooseharmonicexcitationfoDeeanddampingcoe伍cient111e

10、workslayafoundationforavessel’StowermastinengineeringdesignalSOprovideareferenceintheshipassemblylayoutdesigmAswellas，theconclusioninthispaperarevaluableinguidingtheapplicationoftowetmastinhomogeneouswarshipsKeywords：nav