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1、JBraz.Soc.Mech.Sci.Eng.(2016)38:1103–1111DOI10.1007/s40430-015-0428-zTECHNICALPAPERAnalysisoftheacousticalbehaviorofcavitiesusingimpedancefunctionsGustavoPaulinelliGuimarães1·RogérioPirk2,3·CarlosD’AndradeSouto2,3·LuizCarlosSandovalGóes4Received:7April2015/Acce
2、pted:5September2015/Publishedonline:25September2015©TheBrazilianSocietyofMechanicalSciencesandEngineering2015AbstractTheacousticdesignofcavitiesisanimportantoftheimpedancefunctionstoanalyzetheacousticbehav-taskinavarietyofengineeringapplications,fromautomo-ioro
3、fcavities,aswellastocomposethebackgroundintiveoraerospaceindustriestoequipmentcoatingdesigns.ordertodevelop,inthefuture,anacousticmodelingpro-Inthiswork,theacousticimpedancefunctions(afrequencycessusingimpedancefunctions.domainmodel)werecalculatedusinganalytica
4、l,numeri-cal,andexperimentalmethods.ThosedifferentapproachesKeywordsAcoustics·Acousticcavity·Experimentalwerepresentedinaunifiedmannerinordertoallowmodalanalysis·Impedancefunction·AcousticFEMcomparisonsamongthem.Therelationshipoftheimped-ancefunctionandaclassic
5、alfrequencyresponsefunction(FRF)wasalsoestablished.Acircularductofrigidwalls1Introductionwasassumedwithdifferentboundaryconditionsasclosedend,aswellasopenedandabsorbedextremities.ThreeTheacousticdesignofcavitiesispresentinavarietyofductconfigurationswereimpleme
6、ntedinordertocompareengineeringapplicationsaspassenger’scompartments(auto-analytical,numerical,andexperimentalresults.Finally,itmobiles[1],aircrafts[2]),combustionchambers(internalcouldbepossibletoevaluatesomeaspectsthatarecharac-combustionengines[3],rocketengi
7、nes[4,5]),equipment’steristicofalargerangeofacousticsystemsapplicationsascoating[6],mufflersandspacesystemsasfairings[7],andtheexistenceofcomplexmodesandfrequency-dependentequipmentbays[8](launchervehicles).Inthoseapplica-behaviorofabsorptionmaterial.Thisstudya
8、imstheusagetions,theimprovingofthesystem’soperationalefficiency,theprotectionofequipments,andthereductionofnoiseTechnicalEditor:FernandoAlvesRochinha.emission(occupationalhe
