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1、第39卷第8期舰船科学技术Vol.39,No.82017年8月SHIPSCIENCEANDTECHNOLOGYAug.,2017VibrationisolationperformanceofpolyurethaneinterlayerandmodeltestJIFang,WANGFeng,WANGKai,GUOXin,WUMing(ChinaShipResearchandDevelopmentAcademy,Beijing100192,China)Abstract:Thevibrationisolationperforma
2、ncesoftypicalhullstructurewithviscoelasticinterlayerareanalyzedac-cordingtowavetheory,andtheinfluencesofinterlayerYoung’smodulusandlengthonthevibrationreductionaredis-cussed.Thetheoreticalanalysisshowsthatcombinationofpolyurethaneinterlayerwithblockingmasscanenhan
3、cethevibra-tionisolationperformanceandexpandisolationfrequencyband.Inordertoverifytheeffectivenessofpolyurethaneinterlay-er,themodeltestofpowercabin’svibrationiscarriedout.Thetestdatashowsthatthereductionof20–1000Hzvariationacousticlevelathullshellismorethan5dB.Ke
4、ywords:polyurethaneinterlayer；vibrationisolationperformance；wavetheory；modeltest中图分类号：U611文献标识码：A文章编号：1672–7649(2017)08–0055–04doi：10.3404/j.issn.1672–7649.2017.08.0121INTRODUCTIONtionalongthewidthdirection.Thelongitudinalwaveincid-entsfromx= 1speedv1,astheFig.1sh
5、own.BecauseofThereductionofvibrationandnoiseisfullofattentiontheimpedancemismatchatmutationssection,theincidentandchallenging.Theresearchoftransferlawandattenuationwavenotonlytransformsintothetransmissionandreflection,measuresofstructuralnoiseinvesselsisimportant[
6、1].Forthebutalsoproducesthenear-fieldwaveattenuationandwaveship,whichassembledbysteelplateandsteelsection,theconverter.Forthesimplifiedcalculation,thetime-relatedhar-dampingcoefficientofmaterialislow.Andtheobstructionofmonicfactorejωtisomitted.Thevelocityfieldofst
7、ructureasstructureitselfislimitedatstructuralbreak[2–5](suchasphys-following:icalpropertiesofmaterial,thicknessandstructure).InorderThetransmissionvelocitywhichpassedaninterfaceis:togethighersoundinsulation,themeasuremustbeeffect-iveandassembletechnologyreasonably
8、.That’stosay,2Z1vx21=vx1，(1)therigidisolationcombineswithelasticlaminatedintheshipZ1+Z2structure.Where:vx21isparticlevelocityininfiniteviscoelasticmediu
