搜索
:1006-1355(2006)03-0049-03,,(,710072):ANSYSSYSNOISE,,:,,,:;;;;:O427;TB561:ATheNumericalAnalysisofSoundandVibrationfromaSubmergedCylindricalShellCoatedwithViscoelasticLayerbyFEMandBEMHAOCheng2zhi,WANGMin2qing,HUWei2qiang(CollegeofMarine,NorthwesternPolytechnicalUniversity,Xian710072,China)Abstract:ThenumericalanalysisofsoundandvibrationfromasubmergedcylindricalshellcoatedwithdifferentviscoelasticlayerhavebeencarriedoutbyusingFEMsoftwareANSYSandBEMsoft2wareSYSNOISE.Numericalresultsaregiventhattheinfluenceofdifferentviscoelasticlayeronthevibro2acousticsbehaviorofthestructure.Itisshownthattheviscoelasticlayercanreducethesoundradiationofthestructure.Itcanobtainbettereffectonsoundradiationreductionofthestructurebychoosingappropriatethicknessofthelayer.Thevibrationreductionwithviscoelasticlayercoatedin2sidetheshellisbetterthanthatwithviscoelasticlayercoatedoutsidetheshell.Keywords:acoustics;damp;vibration;acousticradiation;elasticshell:2005208201:(50375121);(10574105);(M016628):(1980-),,,,,[1-2],[3],,,,,,,,;+,AN2SYSSYSNOISE1ANSYSSYSNOISE,ANSYS,SYSYNOISE,,SYSNOISE,1.1,MSU+CSÛU+KSU=FS(1)MS,KS,CS,FS[]=[{1}{2}{N}](2)9412[Q]=i[]=[{Q1}{Q2}{QN}](3)[B]=[G]T(i[])=[{B1}{B2}{BN}](4)[H]=[E]-1[D][G]T(i[])=[{H1}{H2}{HN}](5),,1.2S5p5n=-jn(6)Sommerfeldlimxr5p5r+jkp=0(7),HelmholtzsPQ5G(P,Q)5n+jnG(P,Q)dsQ=P(r);rE12P(r);rS0;rI(8)ESI;Q,P;G(P,Q)=e-jkd4dGreen,d=|P-Q|;n;;;n;c;k=/c;S(8),kIknIkn=12Re[pk(kn)](9)WsWs=ksIndS=12ksRe[ps(n)3]dS(10)Fs,WmWm=12Re[Fsu](11)uu,Fs=WsWm(12)22.1,,,1L=2790mm,2R=324mm,h1=6mm,h2=6mm;:s=7800kg/m2,E=2.11011N/m2,s=0.3;:v=1200kg/m3,Ev=3109N/m2,v=0.4,v=0.01;:w=1030kg/m3,c=1460m/s,,,,,22.2h1=6mm33(a),500Hz,500Hz,,,,200663,3(b)800Hz,,800Hz,,,3(a)3(b)2.343mm6mm12mm,:,,,,4(a)4(b)2.45,[5]Flugge531.;(54)15,J1,Matlab,12121LW=10lgWW0,W0=10-12W=0,=/2,=/4,,,12(2)3,,,,,,,:[1]MaidanikG.Vibrationalandradiativeclassificationsofmodesofabaffledfinitepanel[J].SoundVib.,1974,4.[2]Fahy,F.,Foundationsofengineeringacoustical[M].A2cademicPress,London,2001.[3]Wang,B.T.,Fuller,C.R.andDimitriadis,E.K.,Activecontrolofnoisetransmissionthroughrectangularplatesusingmultiplepiezoelectricorpointforceactuators[J].AcoustSoc.Am.1991,90.[4]Wodtke,H.W.andKoopmann,G.H..Quietingplatemodewithoptimallysizedpointmasses2avolumevelocityapproach[A].DesignEngineeringTechnicalConfer2ences,Vol.3(B),ASME,1995.[5]Hashimoto,N.,Measurementofsoundradiationefficien2cybythediscretecalculationmethod[J].AppliedAcous2tics,2001,62.(51)2.,,,;3.,:[1]LaulagnetB,GuyaderJL.Soundradiationfromfinitecylindricalcoatedshells,bymeansofasymptoticexpan2sionofthree2dimensionalequation[J].Acoust.Soc.Am.1994;96(1):277-286.[2]LiuYN,TuckerAJ.Thedistributionofradiatedandvibratorypowersofapoint2infinitecylindricalshellwithacompliantlayer(Noise2Con,WestLafayette,IN,1988).[3],,[J]..1998.[4],.[J].,2001,26(3):193-201.[5],.[J].,1996,(2):133.200663