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www.klippel.de扬声器振膜的振动和辐射分析扬声器振膜的振动和辐射分析,1扬声器振膜的振动和辐射分析扬声器振膜的振动和辐射分析VibrationandRadiationAnalysisofLoudspeakerConesVibrationandRadiationAnalysisofLoudspeakerConesWolfgangKlippelKLIPPELGmbHwww.klippel.de扬声器振膜的振动和辐射分析扬声器振膜的振动和辐射分析,2Abstract:Abstract:•Loudspeakerconesaremoreorlessflexiblestructuresperformingbendingandmembranemodesathigherfrequencies.Theconebreak-upisadesiredmechanismgivingmoreSPLoutputandabetterdirectivitypatternthanarigidconeorpiston.ThemeasurementofthemechanicalvibrationbyusingLaserscanningtechniquesisthebasisforgettingadeeperinsightintothemechanicalvibrationandtheirrelationshiptotheacousticalradiation.Displacementsensorsbasedontriangulationtechniqueareaninterestingalternativetocost-intensiveDopplerInterferometrybecausenotonlythevibrationbutalsothegeometryoftheconeismeasuredathighprecision.ThisdatacanbeusedforconedesignwithFEAandisrequiredforpredictingtheSPLoutput.Anewvibrationandradiationanalysisispresented.Itrevealsradialandcircularmodesandseparatesvibrationcomponentswhichgeneratesoundfromotherotherswhichreducetheacousticaloutput.Thistechniqueopensnewwaysforloudspeakerdiagnosticsandconeoptimizationwhichisillustratedonwoofers,tweeters,headphonesandmicro-speakers.www.klippel.de扬声器振膜的振动和辐射分析扬声器振膜的振动和辐射分析,3扬声器扬声器--一个动态系统一个动态系统LoudspeakerLoudspeaker--aadynamicdynamicsystemsystemConebreakup振膜分裂运动Lengthofsoundwave振动波长30cm15mm3mResonance共振Frequency振动频率1kHz20kHz100Hz1HzCreep蠕动变化Timeconstant时间常数1ms0.05ms10ms1s1hheattransfer热传导lumpedmodelusefulCRL集合模式distributedmodelrequired分散模式Audioband音频范围www.klippel.de扬声器振膜的振动和辐射分析扬声器振膜的振动和辐射分析,4扬声器设计的新工具扬声器设计的新工具NewToolsNewToolsforforLoudspeakerDesignLoudspeakerDesign软件分析AnalyzerSoftware•振膜振动运动可视化Visualizationofconevibration•输出声压的预测Predictionofsoundpressureoutput•指向性Directivity•可分解Decomposition扫描设备ScannerHardware•致力于扬声器设计Dedicatedtoloudspeakers•经济的价格Priceeffective•扫描几何形状Scanninggeometry•更多其它的应用Manyotherapplicationswww.klippel.de扬声器振膜的振动和辐射分析扬声器振膜的振动和辐射分析,5zphir扫描系统SCNScanningSystem•8分钟扫描(对于轴对称振膜)8minscan(foraxisymmetricalcones)•过夜扫描Overnightscan(3000个点3000points)扫描过程从外缘开始逐渐向里推进Thescanningstartsattheoutsiderimandproceedsinwards机械扫描系统带一个转动和二个线性致动器Mechanicalscanningsystemwithonerotational(φ)andtwolinearactuators(r,z)自动化扫描过程AutomaticScanningProcesswww.klippel.de扬声器振膜的振动和辐射分析扬声器振膜的振动和辐射分析,6扫描模式扫描模式ScanningModesScanningModes剖面扫描ProfileScan概况扫描ExploreScan细节扫描DetailedScan8min8hours扫描时间ScanningTime1hour有益于Goodfor•辐射仅对于轴对称几何形状Radiationofaxial-symmetricalGeometriesonly有益于Goodfor•辐射所有振膜Radiationallcones•摇摆模式Rockingmodes有益于Goodfor•辐射Radiation•环状模式Circularmodes•不固定性Irregularitieswww.klippel.de扬声器振膜的振动和辐射分析扬声器振膜的振动和辐射分析,7剖面扫描是很有用的！剖面扫描是很有用的！AAProfileProfileScanScanisalreadyusefulisalreadyuseful!!剖面扫描ProfileScan细节扫描DetailedScan8分钟8min8小时8hourswww.klippel.de扬声器振膜的振动和辐射分析扬声器振膜的振动和辐射分析,8测量几何形状测量几何形状Me...