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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 宋家驥(Chia-Chi Sung) | |
dc.contributor.author | Chen-Che Tsai | en |
dc.contributor.author | 蔡政哲 | zh_TW |
dc.date.accessioned | 2021-06-13T04:19:02Z | - |
dc.date.available | 2021-07-27 | |
dc.date.copyright | 2011-08-01 | |
dc.date.issued | 2011 | |
dc.date.submitted | 2011-07-27 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/32918 | - |
dc.description.abstract | 近年來,於聲子晶體領域之研究發現了重要的特殊形式物理特性。有別於在早期聲子晶體的研究與探討主要集中於能隙的應用與計算,如濾波器、波導或共振腔的設計,根據近期文獻研究發現在其傳導區擁有異常之頻散現象,發現聲子晶體具有負折射特性,使得該方面之研究更成為最近學術界的熱門話題。
本文旨在研究利用此異常頻散現象以及調整幾何形狀排列的改變應用於定向聲源、減噪模組等討論,並以有限元素法( Finite Elementary Method )模擬其波傳結果。 在定向聲源的工作中,為了使點波源自我準則現象更明顯,我們改變了二維聲子晶體排列方式以及選擇其中較佳的結果和文獻中利用共振腔定向聲源方式作比較,使其便於實作上架置於並且達到更好的效果;減噪模組方面我們將三組填充率、填充物半徑、晶格常數皆不同的聲子晶體作組合,由於此三組聲子晶體各自的濾波頻段不同,將其疊合在一起以達到寬頻段濾波的效果,將人耳可聽到的頻段能量過濾掉。有別於以往設計聲子晶體來產生窄頻濾波效果,這種擁有寬頻濾波效果的多層聲子晶體可應需求不同應用於傳統研究領域外的地方。 本論文將藉由可調式二維聲子晶體改變其原始規則形態探討週期性結構所衍伸出的多種特殊物理現象發展適用的二維聲子晶體波傳理論。 這些二維聲子晶體波傳理論進可發展至三維聲子晶體以及應用在未來的生醫領域與機械領域上。 | zh_TW |
dc.description.abstract | Many dispersion characteristics of phononic crystal are investigated. Such as negative refraction have become hot topics of scientific research in recent years.
The arrayed arrangement tunable dispersion characteristics of phononic crystals are observed. By controlling the arrayed arrangement, we can tune the refractive direction and adjust the location of focus and then the tunable acoustic superlens can be designed. There has been much research into the collimation of light source beams by photonic crystals. However, this effect has seldom been achieved using phononic crystals (PCs). On the other hand, it has been shown that acoustic waves may be collimated by resonant cavities in 2D PCs to obtain high directivity. We focuses on the collimation of an acoustic point source by negative refraction in 2D PCs. The advantages of this method are: experiment apparatus is uncomplicated; the divergence angle is only about 5° in the far region; and it has low attenuation when propagating energy. And we also combine three different form 2D PCs become a multilayered PCs to obtain wide frequency bandwidth(20Hz~20kHz) effect. In this method, we can reduce noise which people can hear. It is anticipated that this collimating beam method and multilayered PCs may be applied in 2D and 3D acoustic assembled devices or in ultrasonic and sonar detection devices. | en |
dc.description.provenance | Made available in DSpace on 2021-06-13T04:19:02Z (GMT). No. of bitstreams: 1 ntu-100-R98525028-1.pdf: 3592674 bytes, checksum: c9fe15bb4fefd5d0754f3458ad48449c (MD5) Previous issue date: 2011 | en |
dc.description.tableofcontents | 摘要..............................................................................................................................Ⅰ
Abstract........................................................................................................................Ⅱ 目錄..............................................................................................................................Ⅲ 表目錄..........................................................................................................................Ⅴ 圖目錄..........................................................................................................................Ⅵ 符號..............................................................................................................................Ⅷ 第一章 緒論................................................................................................................1 1-1研究動機..............................................................................................................1 1-2文獻回顧..............................................................................................................2 1-3本文內容架構......................................................................................................4 第二章 數值方法......................................................................................................10 2-1 前言...................................................................................................................10 2-2 布拉菲晶格空間...............................................................................................10 2-3 晶體繞射...........................................................................................................11 2-4 倒晶格...............................................................................................................13 2-5 布里淵區...........................................................................................................14 2-6 布洛克定理.......................................................................................................15 2-7 平面波展開法...................................................................................................16 2-8 有限元素法.......................................................................................................20 2-8-1 聲學模組之有限元素法推導.......................................................................20 2-8-2 邊界條件.......................................................................................................23 2-8-3 結構模組與聲學模組之耦合.......................................................................24 第三章 二維聲子晶體的負折射現象......................................................................33 3-1 前言...................................................................................................................33 3-2 聲子晶體之負折射現象分析與模擬...............................................................33 3-2-1 改變入射角度...............................................................................................34 3-3 二維聲子晶體聚焦現象..................................................................................36 第四章 利用二維聲子晶體定向聲源......................................................................46 4-1 前言...................................................................................................................46 4-2 利用共振腔方法定向聲源...............................................................................46 4-3 利用負折射原理定向聲源...............................................................................48 4-3-1 理論公式推導...............................................................................................49 4-3-2 三角晶格排列之聲子晶體不同入射頻率的聲壓強度等位圖...................50 4-3-3 正方晶格排列之聲子晶體不同入射頻率的聲壓強度等位圖...................51 4-3-4 利用負折射定向聲源不同排列方式的比較...............................................52 4-3-5 共振腔定向聲源法以及直接利用負折射定向聲源法之比較...................52 4-4 結論 .................................................................................................................53 第五章 利用多層二維聲子晶體設計出寬頻頻溝區段..........................................68 5-1 前言...................................................................................................................68 5-2 多層二維聲子晶體...........................................................................................68 5-3 寬頻段中以不同頻率入射於多層聲子晶體聲壓強度等位圖.......................69 5-4 模擬結果討論...................................................................................................70 第六章 結論與未來展望............................................................................................78 6-1 結論...................................................................................................................78 6-2 未來展望...........................................................................................................79 參考文獻......................................................................................................................80 | |
dc.language.iso | zh-TW | |
dc.title | 可調式二維聲子晶體波傳現象 | zh_TW |
dc.title | Acoustic wave propagation of tunable two-dimensional
phononic crystal | en |
dc.type | Thesis | |
dc.date.schoolyear | 99-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 黃維信,羅如燕,黃智勇 | |
dc.subject.keyword | 聲子晶體,填充率,定向聲源,負折射,共振腔,頻溝, | zh_TW |
dc.subject.keyword | phononic crystal,filling ratio,collimating acoustic wave beam,negative refraction,resonant cavity,band gap, | en |
dc.relation.page | 83 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2011-07-28 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 工程科學及海洋工程學研究所 | zh_TW |
顯示於系所單位: | 工程科學及海洋工程學系 |
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