阻尼层对水下圆柱壳辐射声场的去耦特性影响-论文.pdf

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1、第34卷第2期噪声与振动控制Vol34No.22014年4月NOISEANDVIBRATIONCONTROLApr.2014文章编号：1006-1355(2014)02-0022-06阻尼层对水下圆柱壳辐射声场的去耦特性影响1，21，21，2张超，商德江，李琪（1.哈尔滨工程大学水声技术重点实验室，哈尔滨150001；2.哈尔滨工程大学水声工程学院，哈尔滨150001）摘要：基于模态叠加法，采用Navier方程描述阻尼层，建立敷设粘弹性阻尼层的水下圆柱壳振动声辐射模型。与数值计算结果比对，验证了计算模型的可靠性。分析圆柱壳的径向均方振速和辐射声功率，研究了粘弹性阻尼层对水下圆柱壳

2、辐射声场的去耦特性影响。结果表明，粘弹性阻尼层的径向均方振速频响曲线可以分作三个频段，当频率较高时，粘弹性阻尼层能降低辐射声功率；与壳体厚度相比，阻尼层厚度对阻尼层去耦特性的影响更大。关键词：振动与波；粘弹性阻尼层；模态叠加法；水下圆柱壳；去耦特性中图分类号：TB532文献标识码：ADOI编码：10.3969/j.issn.1006-1335.2014.02.006DecouplingCharacteristicofViscoelasticDampingLayerandItsInfluenceonSoundRadiationFieldofUnderwaterCylindrical

3、Shell1，21，21，2ZHANGChao,SHANGDe-jiang,LIQi(1.ScienceandTechnologyonUnderwaterAcousticLaboratory,HarbinEngineeringUniversity,Harbin150001,China;2.CollegeofUnderwaterAcousticEngineering,HarbinEngineeringUniversity,Harbin150001,China)Abstract:Basedonmodalsuperpositionmethod,amodelofvibrationands

4、oundradiationofunderwatercylindricalshellwithviscoelasticdampinglayerisestablished.Inthismodel,thebehaviorofthedampinglayerisdescribedwithNavierequation.Numericalresultsofthismodelareobtained.Thedecouplingcharacteristicoftheviscoelasticdampinglayertothesoundradiationfieldoftheunderwatercylind

5、ricalshellisinvestigatedbyanalyzingthemeansquarevelocityofradialvibrationandthesoundradiationpowerofthecylindricalshell.Theresultsshowthatthefrequencyresponsecurveofthemeansquarevelocityoftheradialvibrationoftheviscoelasticdampinglayercanbedividedintothreeintervalsaccordingtothefrequencies.On

6、lyintheintervalofsignificantlyhighfrequencies,thesoundradiationpowercanbereducedbytheviscoelasticdampinglayer.Thicknessofthedampinglayerhaslargerinfluenceonthedecouplingeffectthanthethicknessoftheshelldoes.Keywords:vibrationandwave;viscoelasticdampinglayer;modalsuperpositionmethod;underwaterc

7、ylindricalshell;decouplingcharacteristic[3][4]圆柱壳是水下航行体的典型结构，其声振性能现。陶猛和白振国将覆盖层看作液体层，用流分析和减振降噪问题受到广大学者的持续关体波动方程描述覆盖层的运动，分别计算了覆盖层[1,2][5]注。敷设声学覆盖层已成为降低圆柱壳水下振对单层和双层圆柱壳的降噪作用。Laulagnet将覆动和声辐射的重要手段，诸多相应的研究也不断涌盖层看作无质量弹簧，仅用一个复刚度描述覆盖层[6][7]的作用。后来，Laul