Effects of viscoelastic properties of engine cover sealing system on noise and vibration attenuation.pdf

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1、IntJMechMaterDes(2006)3:277–284DOI10.1007/s10999-007-9030-6EffectsofviscoelasticpropertiesofenginecoversealingsystemonnoiseandvibrationattenuationY.CharlesLuReceived:8February2007/Accepted:27April2007/Publishedonline:25May2007ÓSpringerScience+BusinessMediaB.V.2

2、007AbstractAutomobileenginecamcoversealsarefunctionbeingsealingtheoilinsidetheenginefrommadeofelastomericmaterialsandusedtosealtheleaking,thecamcoveralsohasthefunctionofinterfacesbetweencoverandunderlyingstructures.attenuatingnoisecausedbyenginevibration.DuetoT

3、hedesignofenginecamcoversealshasbeenitslargesurfaceareaandrelativelysmallthickness,traditionallyfocusedonthesealabilityaspects.thecamcoverhasbeenidentifiedasoneofthemajorRecently,therehasbeenadditionaldemandthatcontributorstoradiatedenginenoise(Challen1982;these

4、sealsbedesignedasvibrationisolatorstoHongetal.2001;LuandAnderson2002;Luandattenuatetheradiatednoisefromtheengine.ToD’Souza2004;Nashif1982).accomplishthisgoal,thefrequency-dependentvis-Thecamcoverassemblyincludesprimarilythecoelasticpropertiesofthesealingcompone

5、ntswillcoveritselfandelastomericsealingsystem,e.g.,thehavetobeconsideredduringthedesignprocess.Thisgasketsandgrommets.Thegasketsarelongrubberarticleexaminesthefrequency-dependentviscoelas-stripssittingbetweencoverflangeandengineheadorticpropertiesofsomecommonlyu

6、sedelastomericspark-plugtowers,whilethegrommetsaretypicallysealsatvariousmountingconfigurations.Ananalyt-rubberdoughnutspre-installedonmetalfasteners.icalspatialtransmissibilitymethodisusedforTheserubbercomponentsareusedoriginallyasevaluatingthedesignofelastomer

7、icsealingsystemsealingcomponents,thusmuchofthedesignconsid-forreducingvibrationandradiatednoise.erationhasbeengiventothesealabilityaspect.TheelastomericsealsareknowntoexhibitstrongKeywordsElastomer
Viscoelasticity
Vibrationfrequency-dependentviscoelasticpropert

8、ies,i.e.,theisolation
Enginenoise
Finiteelementdynamicmodulusincreasesmonotonicallywiththeincreaseoffrequencyandthelossfactordisplaysawidepeak.Thesepropertiesmayhavenegligen