曾群：风扇噪音分析

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1、风扇噪音分析曾群Analysisofmotor-driventhinbladefannoiseZengQunAbstract:Foralongtime,thereisnotamethodtopredictingthenoiselevelofmotor-drivenblade.Inordertosatisfy,wedevelopedamethodforcalculatingthesoundgeneratedwhenarotatingbladeisexcitedbythetorquepulsationofamotor.Thesoundpressurevaluescalculatedbyt

2、henewmethodforarotatingbladewerefoundtocorrespondwellwithexperimentallymeasuredones・i7.65e*017.20e^)1e.7S^O15.S6«4015.42«>01^53^014.08e>013.64O013.10e*012.74«>01230•心14U4.01X£.13.00z7.05e-010iPhaseofvelocityatithnode(rad);qMassdensity(kg/m3);xAngularfrequency(rad/s);ListofsymbolsdsReferencesmal

3、larea(m2);riInstantaneousdistancefromithnodetoP(m);jImaginaryunit;SAreaofsoundradiator(m2);kFreefieldwavenumberofplanewave(1/m);VVelocitydistributionofsoundradiator(m/s);PFieldpoint(m);ViAmplitudeofvelocityatithnode(m/s);pSoundpressurelevel(Pa);.qAngleofsoundradiator(rad);RObservedradius(m);rDi

4、stancefromreferencesmallareads(m);xrAngularvelocityofrotatingradiator(rad/s);1IntroductionAmethodforpredictingtheelectromagneticnoiseofathinbladefandrivenbyanelectricmotorhasbeendeveloped.Electricmotorsareusedasactuatorsinvariouskindsofmachinery.Vibratingmotionsandnoiseinthemachineryarisewhenth

5、eexcitationforcesofelectricmotorsactonelasticpartsofmachinery.Forinstance,anairconditionerhasafanstructureattachedtothemotorshaft.Thethinbladefanvibratesandradiateselectromagneticnoisewhenthetorquepulsationactsontherotatingblades.Anumberofinvestigatorshavestudiedvibrationandnoisecausedbymotors.

6、Hereweproposeanewnoisecalculationmethodforrotatingbladesthatareexcitedbythetorquepulsationofacapacitormoto匚Thecalculationmethodiscomposedoftwomainmodules,oneforanalyzingthevibrationresponseoftheblades,andoneforcalculatingtheelectromagneticnoiseofarotatingblade.Intheanalyzingmodule,thevibrationr

7、esponseofarotatingthinbladeisanalyzedusingbothtorquepulsationandthemeshmodeloftheblade・Tocalculatethemotortorquepulsation,weemployedanequivalentelectriccircuitcorrespondingtothemoto匚Thecalculatedtorquepulsationwasusedtoobtainthev