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1、ProceedingsoftheAcoustics2012NantesConference23-27April2012,Nantes,FranceNoisesourceidenti?cationtechniques:simpletoadvancedapplicationsK.B.GinnandK.HaddadBr¨uel&Kj?rSound&VibrationA/S,Skodsborgvej307,2850N?rum,Denmarkkevinbernard.ginn@bksv.com178123-27Apri
2、l2012,Nantes,FranceProceedingsoftheAcoustics2012NantesConferenceThenumberofnoisesourceidentification(NSI)techniquesavailabletoengineersworkingonnoise,vibrationandharshnessproblemshasincreasedconsiderablyinrecentyears.Thechoiceofthemostappropriatetechniquede
3、pendsupontheapplicationandtheinformationrequired.Thispaperreviewstechniquesfornoisesourceidentificationandquantificationrangingfromsimplehand-heldsoundintensitysystems,hand-heldarraysystemstolargegroundbasedmicrophonearrays.ThemethodsincludeBeamforming,Sphe
4、ricalBeamformingandAcousticHolography.Guidelinesaregiventohelptheengineerchooseasuitabletechniquebasedonthefrequencyrangeofinterest,thedistancefromthemeasurementarraytothetestobjectandtheresolutionrequired.Practicalapplicationexamplesrangingfromhearingaidst
5、owindturbinesarepresentedtoillustratethevariousNSItechniques.1IntroductionSincethe1980?sthesoundintensitytechniquebasedonaphase-matchedpairofmicrophones,hasbeenusedtoNoisesourceidentification(NSI)techniquesareusedtomeasuretheacousticenergyflow.Thisyieldsnot
6、onlytheoptimisethenoiseemissionfromawiderangeofproductsamplitudebutalsothedirectionofthesoundenergy.Theincludingvehicles,householdgoodsandwindturbines.ThemethodhasbeenincorporatedintoanumberofgoalofNSIistoidentifythemostimportantsub-sourcesoninternationalst
7、andardstodeterminesoundpower.anobjectintermsofposition,frequencycontentandsoundSoundintensitymappinginvolvesthemeasurementofpowerradiation.Rankingofthesub-sourcescanthenbesoundintensityspectraatanumberofdiscretepointsonausedtoidentifywheredesignchangeswillm
8、osteffectivelygridclosetotheobjectundertest.Acontourplotisthenimprovetheoverallnoiseradiation.Withaconsiderableproducedandsuperimposedonaphotographtoenablenumberoftechniquesavailable,NVHengineersmighth
