輕外殼對雙層殼體結(jié)構(gòu)水下輻射聲影響研究

1、哈爾濱工程大學(xué)碩士學(xué)位論文輕外殼對雙層殼體結(jié)構(gòu)水下輻射聲影響研究姓名：孫磊申請學(xué)位級別：碩士專業(yè)：水聲工程指導(dǎo)教師：李琪20070301哈爾濱工程大學(xué)碩士學(xué)位論文ABSTRACT111euppermostcharacterofsubmarineistheflexibilityandthestealthwhichhavedecideditsadvantageofsuddenstrikeanditseffectsofterrorizingS

2、othatitisthekeypointofreducingsubmarine’SacousticforhidingitsbodyinnavalbattletoensurethecombateffcctivenessThevibrationandthesoundradiationfromthestructurehaveimportanteffectonthestealthofsubmarineReducingthevibrationan

3、dthesoundradiationofasubmarineCannotonlyimproveitsconceal，butalsoCanenhanceitssonarproperties，improveitsunderseaantagonismabilitytherebygreatlyTherefore，thetheoreticalresearchofunderwatermonolayerorbilayersheUstructureis

4、veryvaluableBasedonthesound—vibrationradiationtheories，numericalanalysisofvibrationandsoundradiationefficiencyaboutthreegroupsincludingthecylinder，theconewithcap，theellipsoidofmonolayerandbilayershell$trUctUleSinthefluid

5、aredisusedandtheFEM(FiniteElementMethod)andBEM(BoundaryElementMethomanalysismodelsarebuiltThenumericalanalysesofvibrationandacousticradiationfromthethreegroupsofmonolayerandbilayershellstructuremodelsarecarriedoutbyusing

6、FEMsoftwareANSYSandBEMsoftwareSYSNOISEFirstthecoupledvibrationoftheshellandwateriscalculatedandthenormaldisplacementofthenodesiSobtained，Thenbytransferringthemeshoftheshellsandthedisplacementvalueson也enodesintosoftwareSY

7、SNOISE，thesoundpressuretheradiatedsoundpowerandtheradiantefficiencyarecarriedoutbySYSNOISEByUSeofthetwosoftwares，theresponseofthesoundandvibrationofshellsarecomputedtheinfluenceofthelightoutercoveringtOthesoundradiationa