請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/87601完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 黃心豪 | zh_TW |
| dc.contributor.advisor | Hsin-Haou Huang | en |
| dc.contributor.author | 林偉智 | zh_TW |
| dc.contributor.author | Wei-Chih Lin | en |
| dc.date.accessioned | 2023-06-20T16:18:04Z | - |
| dc.date.available | 2023-11-09 | - |
| dc.date.copyright | 2023-06-20 | - |
| dc.date.issued | 2023 | - |
| dc.date.submitted | 2023-02-16 | - |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/87601 | - |
| dc.description.abstract | 本研究以空腔吸音結構為基礎，考慮不同材料組合對吸音係數的影響，此吸音材結合了斜面、雙橡膠、空腔的概念實現具有單向傳輸性能的水下超穎聲學二極體結構，為水下超穎材料提出一種新的設計方向。本研究所使用之吸音材先由簡易均質的純材料結構進行嘗試製作，並以實際的材料參數以及有限元素模擬進行輔助建構阻抗管尺度的試片驗證實驗及模擬結果是吻合的。透過有限元素模擬進行模型優化後決定以丁腈橡膠及三元乙丙橡膠組合進行二極體結構試體製作與吸音係數量測。將製作出的最佳化試片使用本實驗室建置的充水阻抗管進行三參數校正法的實驗量測，實驗量測結果顯示在3000到10000 Hz之內皆達到正向入射吸音係數有達0.6以上，而反向入射吸音係數皆在0.2以下，且由正反向入射有明顯的單向傳輸結果，而有限元素模擬也獲得相同的趨勢。最終透過實驗與有限元素模擬證明模型具有二極體效果，說明本研究所提出的結構設計有實際上應用之潛力。 | zh_TW |
| dc.description.abstract | This study based on cavity sound-absorbing structure, consider effect of different material combinations for sound absorption coefficient. The structure uses idea of bevel, double rubber, and cavity to realize an underwater acoustic diode metamaterial structure with unidirectional transmission performance. Propose a new design direction for underwater sound-absorbing materials. The sound-absorbing materials used in this study are firstly made from homogeneous material structure, and use actual material parameters and finite element simulation to construct test sample of impedance tube scale to verify that the experimental and simulation results are consistent. After optimizing model through finite element simulation, we selected combination of NBR and EPDM rubber for diode structure test sample to production and measured sound absorption coefficient. The test sample uses water-filled impedance tube built in this laboratory to carry out experimental measurement of the three-parameter calibration method. The results of finite element analysis and experimental measurement show that sound absorption coefficient of forward incidence is above 0.6 and backward incidence is below 0.2 in range of 3000 to 10000 Hz. And there is an obvious unidirectional transmission result from the forward and backward incidence, and the finite element simulation also obtains the same trend.
Finally, through experiments and finite element simulation, it is proved the model has diode effect, indicating the design structure proposed in this study has potential for practical application. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2023-06-20T16:18:04Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2023-06-20T16:18:04Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 口試委員會審定書 i
誌謝 ii 摘要 iii Abstract iv 目錄 v 圖目錄 viii 表目錄 xi 第一章 緒論 1 1.1 研究動機與背景 1 1.2 研究目的 2 1.3 重要性與貢獻 2 1.4 名詞對照與符號說明 2 1.4.1 英文專有名詞與中文翻譯對照 2 1.4.2 符號說明表 4 第二章 文獻探討 7 2.1 聲學超穎材料 7 2.2 水下吸音材 14 第三章 研究方法 18 3.1 研究架構與流程 18 3.2 聲波方程式 19 3.2.1 狀態方程式 19 3.2.2 連續方程式 19 3.2.3 尤拉方程式 20 3.2.4 線性聲波方程式 21 3.3 波傳現象 24 3.3.1 平面波 24 3.3.2 聲阻抗 25 3.3.3 波導管截止頻率 27 3.3.4 吸音係數 30 3.4 吸音材試片材料與結構 31 3.4.1 材料參數整理 31 3.4.2 研究模型代號說明 33 3.4.3 吸音材試片製作 34 3.5 有限元素模擬設定 37 3.6 充水阻抗管傳遞函數法 40 3.6.1 阻抗管傳遞函數法 40 3.6.2 三參數校正法 43 3.7 實驗配置 45 3.7.1 硬體介紹 45 3.7.2 軟體介紹 46 第四章 結果 48 4.1 阻抗管量測 48 4.1.1 預測試 48 4.1.2 三參數校正 48 4.2 二極體雛型模型 50 4.3 橡膠材料吸音性能量測 51 4.3.1 Model B不同疊層橡膠結果 51 4.3.2 Model B單橡膠結果 53 4.4 斜面與階梯雙橡膠結構吸音係數 54 4.4.1 Model C斜面與Model D階梯結構模擬結果 54 4.4.2 Model D階梯結構實驗結果 55 4.5 空腔階梯雙橡膠結構吸音係數 56 4.5.1 Model E穿孔空腔結果 56 4.5.2 Model E海綿空腔結果 57 第五章 討論 59 5.1 Model B結果討論 59 5.1.1 不同疊層橡膠 59 5.1.2 均質橡膠材料 60 5.1.3 不同背板吸音係數影響 61 5.2 斜面與階梯等效結構 62 5.3 雙橡膠結構能量耗散 63 5.4 雙橡膠空腔結構結果討論 65 5.4.1 空腔結構能量耗散 65 5.4.2 Model D與Model E吸音係數比較 68 第六章 結論與未來展望 70 6.1 結論 70 6.2 未來展望 71 參考文獻 72 | - |
| dc.language.iso | zh_TW | - |
| dc.subject | 聲學二極體 | zh_TW |
| dc.subject | 水下聲波 | zh_TW |
| dc.subject | 超穎材料 | zh_TW |
| dc.subject | 吸音 | zh_TW |
| dc.subject | 單向傳輸 | zh_TW |
| dc.subject | underwater acoustic wave | en |
| dc.subject | metamaterial | en |
| dc.subject | unidirectional transmission | en |
| dc.subject | acoustic diode | en |
| dc.subject | sound absorption | en |
| dc.title | 水下超穎聲學二極體結構之吸音機制探討與充水阻抗管實驗驗證 | zh_TW |
| dc.title | Study on Absorption Property of Underwater Acoustic Diode Metamaterial Structure and Experimental Verification of Water-filled Impedance Tube | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 111-1 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 王昭男;宋家驥;李佳翰;黃勝翊 | zh_TW |
| dc.contributor.oralexamcommittee | Chao-Nan Wang;Chia-Chi Sung;Jia-Han Li;Hseng-Ji Huang | en |
| dc.subject.keyword | 超穎材料,水下聲波,聲學二極體,單向傳輸,吸音, | zh_TW |
| dc.subject.keyword | metamaterial,underwater acoustic wave,acoustic diode,unidirectional transmission,sound absorption, | en |
| dc.relation.page | 80 | - |
| dc.identifier.doi | 10.6342/NTU202300416 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2023-02-17 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 工程科學及海洋工程學系 | - |
| 顯示於系所單位： | 工程科學及海洋工程學系 | |
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