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手机音腔及出音孔的设计计算.ppt

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OptimalSoundMatchingSolutionthroughHelmholtzresonatortheory

Basictheory HelmholtzResonatorwasinventedforsoundanalysisbyH.VONHelmholtz(1821~1894) Itsapplicationsarevariousfrombell,violin,guitarandbassspeakercabinet. Itfeaturesshorterneckandvolumebottlethanwaveasshownbelow. Specificfrequencydependsonairvolumeinneck(weight)andvolumeinthebottle(spring) Sospecificfrequencyiscalculatedasbelow. a?:Neck’sarea(㎡) V:Resonatorvolume(?) L:Neck’slength(m) C:Soundvelocity(344m/s) ???? ThereforeanyshapesofresonatorisnotaffectingResonantFrequency. Ifthevolumeneck’slengthissame,theresonatorhassameresonantfrequencyevenindifferentshape.

Ex.1)What’stheresonantfrequencyincaseofabottlewithouterdia.9.8cm,necklength10cm,neckouterdia.3cm?OptimalSoundMatchingSolutionthroughHelmholtzresonatortheory

2.Application(1)Insidestructureofhandseta:Holetotalarea(m2)SpeakerLCASEV:FrontVolumea:AirHoleBackVolumeL:Casethickness(m)V:Frontvolume(m3)C:344m/s(RT20℃)ApplicationOptimalSoundMatchingSolutionthroughHelmholtzresonatortheory

(2)Examplemodel:SS1534P-008-SIZE:Φ15mmX3.4H-Fo:850Hz-Ze:8ohm(3)Testconditions*Inputpower:0.1Wat5cmOptimalSoundMatchingSolutionthroughHelmholtzresonatortheory

A:FrequencyResponse,MagndBre20.00Pa/V1002005001k2k5k10kHz60708090100110dBX:900.00HzY:98.92dBZA:LiveCurveTSRfund.SS1534P-008GRAPHinBAFFLEOriginaltestresultOptimalSoundMatchingSolutionthroughHelmholtzresonatortheory

(4)TESTaccordingtosomevariationsTestconditionOptimalSoundMatchingSolutionthroughHelmholtzresonatortheoryBasicStructure01AirHolequantityvariation02Casethicknessvariation03FrontVolumevariation04BackVolumevariation05

①Basicstructurea:Φ1.55mmX4eaL:1.55mm

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