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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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金属圆柱结构中声聚焦效应的研究
DOI: 10.13232/j.cnki.jnju.2015.06.006, PP. 1132-1138
Keywords: 声聚焦,圆柱,本征模式
Abstract:
研究浸没在水中金属空心圆柱结构的声聚焦效应及其物理机制,并探索声聚焦频率与圆柱结构参数之间的关系.研究表明:当超声波源从外侧入射到圆柱结构表面时,在圆柱结构中心会出现声聚焦效应.这种声聚焦效应源于金属圆柱结构中的位移本征模式,与之前研究利用负折射机制实现声聚焦效应完全不同,是一种全新的物理机制.在圆柱结构的位移本征模式作用下,入射声波的传播方向在圆柱结构内部发生重建,均沿着圆柱径向指向圆心,同时相位波形也呈现出同心圆分布,从而在圆柱结构中心聚焦成一个完美的圆形焦点,焦点在水平方向与垂直方向均表现出优异的聚焦性能.此外,基于声散射理论推导得到系统的特征方程,计算出声聚焦的特征频率,理论与数值结果符合很好.结果表明:圆柱结构可在多个频率出现声聚焦效应,相邻的两个声聚焦频率的间隔相同,且焦点的尺寸随着聚焦频率增加而变小.当金属圆柱结构的内外半径同时增大时,圆柱结构的声聚焦频率会减小,且声聚焦频率与圆柱的尺寸成反比关系.本研究为新型声聚焦器件的研制提供有效的设计思路及理论依据.
| [1] | 任悦，刘杰惠，刘晓宙等.基于有限元分析的超声弹性成像仿真研究，南京大学学报(自然科学),2015,51(1):7-13.
|
| [2] | linscs,huangtj,sunjh,etal.gradient-indexphononiccrystals.physicalreviewb,2009,79(9):094302.
|
| [3] | torrentd,sánchez-dehesaj.acousticmetamaterialsfornewtwo-dimensionalsonicdevices.newjournalofphysics,2007,9(9):323-335.
|
| [4] | pengss,hezj,zhangaq,etal.acousticfar-fieldfocusingeffectfortwo-dimensionalgradednegativerefractive-indexsoniccrystals.appliedphysicsletters,2010,96(26):263502.
|
| [5] | zhangs,yinl,fangn.focusingultrasoundwithanacousticmetamaterialnetwork.physicalreviewletters,2009,102(19):194301.
|
| [6] | zhoux,hug.superlensingeffectofananisotropicmetamaterialslabwithnear-zerodynamicmass.appliedphysicsletters,2011,98(26):263510.
|
| [7] | hezj,jiah,qiucy,etal.acoustictransmissionenhancementthroughaperiodicallystructuredstiffplatewithoutanyopening.physicalreviewletters,2010,105(7):074301.
|
| [8] | sunhx,zhangsy,shuixj.atunableacousticdiodemadebyametalplatewithperiodicalstructure.appliedphysicsletters,2012,100(10):103507.
|
| [9] | xiajp,sunhx.acousticfocusingbymetalcircularringstructure.appliedphysicsletters,2015,106(6):063505.
|
| [10] | dengk,dingyq,hezj,etal.gradednegativeindexlenswithdesignablefocallengthbyphononiccrystal.journalofphysicsd:appliedphysics,?2009,42(18):185505.
|
| [11] | martintp,nicholasm,orrisgj,etal.sonicgradientindexlensforaqueousapplications.appliedphysicsletters,2010,97(11):113503.
|
| [12] | martintp,laymancn,moorekm,etal.elasticshellswithhigh-contrastmaterialpropertiesasacousticmetamaterialcomponents.physicalreviewb,2012,85(16):161103.
|
| [13] | zigoneanul,popabi,cummersa.designandmeasurementsofabroadbandtwo-dimensionalacousticlens.physicalreviewb,2011,84(2):024305.
|
| [14] | liy,liangb,taox,etal.acousticfocusingbycoilingupspace.appliedphysicsletters,2012,101(23):233508.
|
| [15] | wangw,xiey,konnekera,etal.designanddemonstrationofbroadbandthinplanardiffractiveacousticlenses.appliedphysicsletters,2014,105(10):101904.
|
| [16] | sunhx,zhangsy.enhancementofasymmetricacoustictransmission.appliedphysicsletters,2013,102(11):113511.
|
| [17] | weiq,chengy,liuxj.acousticomnidirectionalsuperabsorberwitharbitrarycontour.appliedphysicsletters,2012,100(9):094105.
|
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