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1、AstudyofvibrationandvibrationcontrolofshipstructuresTianRanLin1,a,JiePan1,b,PeterJ.O’Shea1,caSchoolofEngineeringSystems,QueenslandUniversityofTechnology,2GeorgeStreet,Brisbane,Queensland4001,AustraliabSchoolofMechanicalEngineering,UniversityofWesternAustralia,35StirlingHighway,Nedlands,WesternAu
2、stralia,AustraliacDepartmentofMechanicalandMaterialEngineering,QueensUniversity,Kingston,OntarioK7LKeywords:Mobility;Vibrationcontrol;Shipstructures;Vibrationcontrol;Beams;Wavecon?nement.Abstract.Thispaperexaminesthevibrationcharacteristicsandvibrationcontrolofcomplexshipstructures.Itisshownthat
3、inputmobilitiesofashipstructureatenginesupports,duetoout-of-planeforceorbendingmomentexcitations,aregovernedbytheflexurestiffnessoftheenginesupports.Thefrequencyaveragedinputmobilitiesoftheshipstructure,duetosuchexcitations,canberepresentedbythoseofthecorrespondinginfinitebeam.Thetorsionalmoment
4、inputmobilityattheenginesupportcanbeestimatedfromthetorsionalresponseoftheenginebedsectionunderdirectexcitation.Itisfoundthattheinclusionofshiphullanddeckplatesintheshipstructuremodelhaslittleeffectonthefrequency-averagedresponseoftheshipstructure.Thisstudyalsoshowsthatvibrationpropagationincomp
5、lexshipstructuresatlowfrequenciescanbeattenuatedbyimposingirregularitiestotheringframelocationsinships.Vibrationresponsesofshipstructuresduetomachineryexcitationsathigherfrequenciescanbecontrolledbystructuralmodi?cationsofthelocalsupportingstructuressuchasenginebedsinships.1.IntroductionAnunwant
6、edsideeffectofbuildingfasterandlightershipsistheincreasingnoiseandvibrationinships.Inordertoretainthefullbene?tofbuildingfastershipswithoutcompromisingtheridecomfortandsafety,effectivenoiseandvibrationcontrolneedstobeimplementedtoshipstructures.Nonetheless,duetothecomplexityofshipstructuresandth
7、ecouplingofdifferentwavetypesinthestructure,controlofwavepropagationinshipstructuresbyactivecontrolmethodsisexpensiveandineffective,whiletraditionalpassivevibrationcontrolmethodssuchasaddingdampingmaterialsisonlyeffectiveath
