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湍流边界层脉动压力激励潜艇模型振动声辐射.docx

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湍流边界层脉动压力激励潜艇模型振动声辐射 Abstract Thestudyofthevibrationandsoundradiationcausedbyturbulentboundarylayerfluctuatingpressureexcitationonsubmarinemodelsisofgreatsignificancetothemarineengineeringfield.Inthispaper,thefactorsaffectingthevibrationandsoundradiationofsubmarinemodelsareanalyzedbasedonthetheoryoffluidmechanicsandacoustics.Throughnumericalsimulationandexperimentalresearch,thevibrationandsoundradiationofsubmarinemodelsunderdifferentturbulentflowconditionsareanalyzed,andthecorrespondingcountermeasuresareproposedtoreducethevibrationandsoundradiation. Keywords:turbulentboundarylayer,fluctuatingpressureexcitation,submarinemodel,vibration,soundradiation Introduction Withthecontinuousdevelopmentofmarinetechnology,submarineshavebecomeimportantweaponsformanycountries.However,thevibrationandsoundradiationcausedbysubmarinesduringoperationhavebecomeamajorproblemthataffectstheirperformanceandconcealment.Theturbulentboundarylayerfluctuatingpressureexcitationisoneofthemainsourcesofsubmarinevibrationandsoundradiation.Therefore,itisofgreatsignificancetostudythevibrationandsoundradiationcausedbyturbulentboundarylayerfluctuatingpressureexcitationonsubmarinemodels. FactorsInfluencingSubmarineModelVibrationandSoundRadiation Thevibrationandsoundradiationofsubmarinemodelsareaffectedbymanyfactors,mainlyincludingfluidproperties,geometricparameters,flowconditions,andstructuralparameters. 1.Fluidproperties Thefluidproperties,suchasviscosityanddensity,haveasignificantimpactontheturbulenceintensityoftheboundarylayerandtheconsequentfluctuatingpressure. 2.Geometricparameters Thegeometricparametersofthesubmarinemodel,suchasthelength,diameter,andshape,affectthespeedanddirectionoftheflow,andthenaffecttheturbulenceintensityandfluctuatingpressureoftheboundarylayer. 3.Flowconditions Theflowconditions,suchasfreestreamvelocityandturbulenceintensity,haveasignificantimpactontheturbulenceintensityoftheboundarylayerandtheconsequentfluctuatingpressure. 4.Structuralparameters Thestructuralparametersofthesubm