Numerical simulation of nonlinear propagation of sound waves in a finite horn-中国期刊网

摘要 Nonlinearacousticpropagationgeneratedbyapistoninafinitehornisnumericallystudied.Aquasi-one-dimensionalnonlinearmodelwithvaryingcross-sectionuseshigh-orderlow-dispersionnumericalschemestosolvethegoverningequation.Becauseofthenonlinearwavedistortionandreflectedsoundwavesatthemouth,broadbandtime-domainimpedanceboundaryconditionsareemployed.Theimpedanceapproximationcanbeoptimizedtoidentifythecomplex-conjugatepole-residuepairsoftheimpedancefunctions,whichcanbecalculatedbyfastandefficientrecursiveconvolution.Thenumericalresultsagreeverywellwithexperimentaldatainthesituationsofweaknonlinearwavepropagationinanexponentialhorn,itisshownthatthemodelcandescribethebroadbandcharacteristicscausedbynonlineardistortion.Moreover,finite-amplitudeacousticpropagationintypesofhornsissimulated,includinghyperbolic,conical,exponentialandsinusoidalhorns.Itisfoundthatsoundpressurelevelsatthehornmoutharestronglyaffectedbythehornprofiles,thedrivingvelocityandfrequencyofthepiston.Thepaperalsodiscussestheinfluenceofthehorngeometryonnonlinearwaveformdistortion.

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Numerical simulation of nonlinear propagation of sound waves in a finite horn

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Numerical simulation of nonlinear propagation of sound waves in a finite horn

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