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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/68167完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 黃心豪 | |
| dc.contributor.author | Jia-Hao He | en |
| dc.contributor.author | 何家豪 | zh_TW |
| dc.date.accessioned | 2021-06-17T02:13:53Z | - |
| dc.date.available | 2023-01-04 | |
| dc.date.copyright | 2018-01-04 | |
| dc.date.issued | 2017 | |
| dc.date.submitted | 2017-11-22 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/68167 | - |
| dc.description.abstract | 本研究中提出一多組態之可調控式聲學二極體，該結構是由兩種尺寸之金屬鋁棒所組成，本研究使用方法：其中數值模擬部分使用有元素法分析藉由商用軟體COMSOL Multiphysics 5.0，包含特徵頻率計算與聲壓場計算，而實驗部分則是在無響室中進行聲學實驗量測該結構之穿透損失，由上述兩方法所得之實驗與模擬結果呈現了良好之吻合程度。進一步分析下列項目：各組態下之調控性能與比較、大小角度轉動所帶來之效益、容許小角度調控誤差以及聲學薄膜之設計討論。本研究之設計將改善現有之聲學二極體存在之問題，並透過薄膜設計將有希望可以應用於非破壞檢測以及醫用超聲波，舉凡聲學成像清晰與避免聲學儀器損壞。 | zh_TW |
| dc.description.abstract | In this research, the sonic-crystal-based tunable acoustic diode is proposed. This proposed acoustic diode can tune working frequency ranges by transforming its configurations. The acoustic characteristics of nonlinear transmission in proposed structure have favorable agreement between numerical results and experimental results. For these results, all the numerical results are calculated by using COMSOL Multiphysics 5.0 and the experiment results are measured in anechoic chamber. Moreover, effects of rotating angles and allowable errors of rotating angles are discussed to indicate that the proposed structure is a promising acoustic device for applications in the future. The proposed structure is designed as an acoustic membrane and this membrane shows its favorable tunability for controlling unidirectional transmission. All analyses for the proposed structure are beneficial to acoustic applications. The proposed acoustic membrane can alleviate the problems of acoustic imaging and non-destructive testing, and keep acoustic device from damages. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T02:13:53Z (GMT). No. of bitstreams: 1 ntu-106-R04525079-1.pdf: 4880785 bytes, checksum: 4e6d3945b8994bae038fbeb8148f857e (MD5) Previous issue date: 2017 | en |
| dc.description.tableofcontents | 口試委員會審定書 #
誌謝 i 中文摘要 ii ABSTRACT iii 目錄 iv 圖目錄 vii 表目錄 xi 第1章 簡介 1 1.1 研究動機 1 1.2 研究背景 1 1.3 研究目的 2 1.4 重要性與貢獻 3 1.5 名詞對照與符號說明 4 1.5.1 英文專有名詞與中文翻譯對照 4 1.5.2 符號說明表 6 第2章 文獻探討 8 2.1 超穎材料 8 2.2 聲子晶體 9 2.3 聲學二極體 11 第3章 方法 14 3.1 研究架構與流程 14 3.2 晶格結構與晶格諧振理論 15 3.2.1 布拉格定律 15 3.2.2 倒晶格與布里淵區 16 3.2.3 布洛赫函數與能隙 18 3.3 聲學調控機制 20 3.4 多組態聲子晶體聲學二極體 21 3.5 穿透損失、穿透率與對比率 23 3.6 有限元素數值模擬 25 3.6.1 模擬方法之驗證 25 3.6.2 模擬方法與其理論 27 3.7 聲壓實驗 28 3.7.1 試體製作與組裝 28 3.7.2 儀器與實驗裝置 30 3.7.3 實驗架設 33 3.7.4 實驗量測 35 3.7.5 實驗數據處理 37 第4章 結果 39 4.1 模擬結果 39 4.1.1 頻散曲線模擬結果 39 4.1.2 穿透率與對比率模擬結果 40 4.1.3 穿透損失與局部能隙 42 4.2 實驗結果 45 4.2.1 背景噪音與喇叭聲源 45 4.2.2 實驗重現性 46 4.2.3 穿透損失實驗結果 47 第5章 討論 51 5.1 數值計算與實驗結果討論 51 5.1.1 模擬與實驗之結果比較 51 5.1.2 誤差討論與改良方法 53 5.2 調控機制討論 54 5.2.1 局部能隙與穿透損失討論 54 5.2.2 四組態之調控討論 60 5.3 參數討論 61 5.3.1 結構尺寸 62 5.3.2 結構角度 65 5.3.3 結構小角度誤差 71 5.4 設計與應用討論 74 第6章 結論與未來展望 77 6.1 結論 77 6.2 未來展望 78 參考文獻 79 附錄 82 A 特徵頻率模擬分析 82 B 聲壓場模擬分析 84 | |
| dc.language.iso | zh-TW | |
| dc.subject | 可調控式聲學二極體 | zh_TW |
| dc.subject | 多組態結構 | zh_TW |
| dc.subject | 聲學薄膜 | zh_TW |
| dc.subject | 非線性傳輸 | zh_TW |
| dc.subject | non-linear transmission | en |
| dc.subject | tunable acoustic diode | en |
| dc.subject | acoustic membrane | en |
| dc.subject | Multi-configuration typed structure | en |
| dc.title | 多組態聲子晶體之聲學二極體於可調控單向聲波傳輸 | zh_TW |
| dc.title | Tunable unidirectional sound wave propagation though multi-configuration sonic-crystal-based acoustic diode | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 106-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王昭男,吳文中,宋家驥 | |
| dc.subject.keyword | 多組態結構,可調控式聲學二極體,聲學薄膜,非線性傳輸, | zh_TW |
| dc.subject.keyword | Multi-configuration typed structure,tunable acoustic diode,acoustic membrane,non-linear transmission, | en |
| dc.relation.page | 85 | |
| dc.identifier.doi | 10.6342/NTU201704397 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2017-11-23 | |
| 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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