Acoustic Waveguides

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1、AcousticWaveguidesJohnPriceUniversityofColorado,BoulderVersiondate:January22,2008TableofContents1.Introduction.........................................................................................................11.1WhyAcousticWaveguides?...............

2、...................................................11.1WaveguideMeasurementSystems........................................................42.ElementaryAcoustics.........................................................................................62.1Hel

3、mholtzWaveEquation.....................................................................62.2SoundVelocity......................................................................................92.3PlaneWaves....................................................

4、....................................112.4SphericalWaves..................................................................................133.AcousticWaveguides........................................................................................143.1Prop

5、agatingModes.............................................................................143.2AcousticCircuitElements...................................................................163.3ReflectionCoefficient..............................................

6、............................243.4WaveguideScatteringMatrix.............................................................283.5AttenuationinWaveguides.................................................................30i1.Introduction1.1WhyAcousticWaveguides?Le

7、tussupposethatwewanttoknowhowmuchacousticpowercanbeproducedbyabugle.Weinviteacooperativebugleplayerintoaroomoutfittedwithacalibratedmicrophoneandrecordingequipment(Figure1.1).Suspectingthathighnotesarethemostpowerful,weaskhertoblastawayasloudlyaspossiblein

8、theupperrangeoftheinstrument.Figure1.1.Measuringtheacousticpowerofabugle.Toanalyzeourdatawecouldapproximatethebuglebellasapointsourceemittingasphericalwave,andinferthetotalpowerfromtheacousticpressuremeasured