請用此 Handle URI 來引用此文件：
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/85409完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 劉建豪(Chien-Hao Liu) | |
| dc.contributor.author | Sheng-Yu Ho | en |
| dc.contributor.author | 何昇祐 | zh_TW |
| dc.date.accessioned | 2023-03-19T23:16:15Z | - |
| dc.date.copyright | 2022-08-05 | |
| dc.date.issued | 2022 | |
| dc.date.submitted | 2022-07-21 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/85409 | - |
| dc.description.abstract | 本文提出了雙空氣流道消聲結構，其尺寸與厚度可以達到次波長，具有寬頻消音的特性來減低噪音和擁有可透氣式的空氣流道來增加空氣流通性，並將其微型化製作出入耳式低頻降噪耳塞，能實現寬頻消音與減緩傳統耳塞所帶來的悶熱感。在本文中，透過分析聲波在管道中的傳遞，以此建立具有聲輻射阻抗、變管效應、熱黏損耗之聲學傳輸線模型，此方法與有限元素 (FEM) 相比，能夠更有效的設計結構幾何參數，而該模型也能夠計算具有穿透損失之吸音率舆無穿透失之共振式吸音板的吸音率，將聲學傳輸線模型與FEM 的結果相比，兩者具有高度一致性，且與實驗量測的結果相當吻合。入耳式低頻降噪耳塞的消聲性能，藉由封閉音場實驗與有限元素模擬相互驗證其插入損失，證明了入耳式耳塞的可行性，並能夠透過聲學傳輸線模型的穿透損失預估其消聲頻段。最終顯示了雙流道結構與微型化入耳式低頻降噪耳塞，具有低頻抗噪通風能力的表現，達到66 %與100 %的10 dB比例頻寬，與68 %的空氣流通率，其結構厚度達到0107 與0.11 。可流通式次波長結構在將來有潛能的應用在大型通風式隔音牆，或是入耳式消聲耳塞。 | zh_TW |
| dc.description.abstract | In this research, a dual-channel sound-insulation structure with subwavelength size and dimension is proposed. It can achieve a broadband sound insulation and matain air circulation due to ventilated an air channel. The structure is farther miniaturized for developing an in-ear low-frequency reducer. Noise-insulation earplugs can achieve broadband noise reduction and reduce the sultry feeling caused by traditional earplugs. In this research, an acoustic transmission line model with acoustic radiation impedance, radiation effect, and thermal viscosity loss is established by analyzing the transmission of sound waves in the duct. Compared with finite element method (FEM), this method can design multiple air-channel structures and optimize their geometry more effectively, and the model can also calculate the sound absorption rate with transmission loss and the sound absorption rate of resonant acoustic panels without transmission loss. The simulation results of both models match well and are in good agreement with the experimental results. The noise cancellation performance of the in-ear low-frequency noise-cancelling earplugs is verified by the closed sound field experiment and the finite element simulations. Finally, the dual-flow channel structure and miniaturized in-ear low-frequency noise-cancelling earplugs have the performance of low-frequency anti-noise ventilation, reaching 66% and 100% of the 10 dB proportional bandwidth, and 68% of the air flow rate, and its structural thickness reaches 0107 and 0.11 . The flow-through subwavelength structure has potential applications in large ventilated soundproof walls or in-ear noise-cancelling earplugs in the future. | en |
| dc.description.provenance | Made available in DSpace on 2023-03-19T23:16:15Z (GMT). No. of bitstreams: 1 U0001-2007202216582200.pdf: 18598557 bytes, checksum: 0c0a9756ce0dd57789d06a9744632fc2 (MD5) Previous issue date: 2022 | en |
| dc.description.tableofcontents | 誌謝 I 中文摘要 II ABSTRACT III 目錄 IV 圖目錄 VI 表目錄 XI Chapter 1 緒論 1 1.1 研究動機 1 1.2 文獻回顧 4 1.3 章節介紹 16 Chapter 2 理論 17 2.1 基本聲學理論 17 2.2 等截面積聲波導管 18 2.3 聲學傳輸線 20 2.4 聲學傳輸線損耗 25 Chapter 3 三維結構參數設計 34 3.1 比例頻寬 34 3.2 電路類比 35 3.3 結構設計 47 3.4 等效電路模擬 49 Chapter 4 有限元素模擬 53 4.1 穿透損失 53 4.2 插入損失 64 Chapter 5 實驗量測 70 5.1 穿透損失量測 70 5.1.1 試片規格 74 5.1.2 標準測試理論 77 5.1.3 麥克風效正 78 5.1.4 量測步驟 79 5.2 插入損失 82 5.2.1 試片規格 85 5.2.2 反射音場實驗方法 86 5.2.3 封閉音場實驗方式 89 Chapter 6 結果與討論 91 Chapter 7 結論與未來展望 97 7.1 結論 97 7.2 未來展望 98 參考文獻 99 | |
| dc.language.iso | zh-TW | |
| dc.subject | 入耳式耳塞 | zh_TW |
| dc.subject | 聲學傳輸線 | zh_TW |
| dc.subject | 低頻抗噪 | zh_TW |
| dc.subject | 通透式消音結構 | zh_TW |
| dc.subject | ventilated acoustic sound-insulation structure | en |
| dc.subject | Acoustic transmission line | en |
| dc.subject | Low-frequency Anti-noise | en |
| dc.subject | in-ear earplug | en |
| dc.title | 可流通式次波長聲學結構應用於低頻抗噪入耳式耳塞 | zh_TW |
| dc.title | Ventilated Subwavelength Acoustic Structure Applied to Low-frequency Anti-noise Earplug | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 110-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王昭男(Chao-Nan Wang),周元昉(Yuan-Fang Chou),黃育熙(Yu-Hsi Huang),陳蓉珊(Jung-San Chen) | |
| dc.subject.keyword | 聲學傳輸線,低頻抗噪,通透式消音結構,入耳式耳塞, | zh_TW |
| dc.subject.keyword | Acoustic transmission line,Low-frequency Anti-noise,ventilated acoustic sound-insulation structure,in-ear earplug, | en |
| dc.relation.page | 106 | |
| dc.identifier.doi | 10.6342/NTU202201581 | |
| dc.rights.note | 同意授權(全球公開) | |
| dc.date.accepted | 2022-07-21 | |
| dc.contributor.author-college | 工學院 | zh_TW |
| dc.contributor.author-dept | 機械工程學研究所 | zh_TW |
| dc.date.embargo-lift | 2024-07-06 | - |
| 顯示於系所單位： | 機械工程學系 | |
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| U0001-2007202216582200.pdf | 18.16 MB | Adobe PDF | 檢視/開啟 |
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