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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/52072完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳琪芳 | |
| dc.contributor.author | Yu-Hang Wu | en |
| dc.contributor.author | 吳宇航 | zh_TW |
| dc.date.accessioned | 2021-06-15T14:06:48Z | - |
| dc.date.available | 2025-12-31 | |
| dc.date.copyright | 2015-08-25 | |
| dc.date.issued | 2015 | |
| dc.date.submitted | 2015-08-20 | |
| dc.identifier.citation | 參考文獻
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/52072 | - |
| dc.description.abstract | 由於氣泡在實際海洋中的穩定度不盡理想，所以將改變過去氣泡幕減噪的形式，採用氣球進行減噪實驗，透過氣泡共振現象(Bubble Acoustic Resonance Phenomena)之研究方法與加入薄膜理論的Church數學模型[1]進行減噪分析，林等人[2]指出單一尺寸減噪效益影響頻段有限，而本研究結合半徑5公分與7公分氣球的減噪頻段，利用兩種尺寸組合之氣球幕，提升100 Hz到1000 Hz頻段內的減噪效益，從探討各項參數對氣球幕減噪效益的影響，設計混和氣球幕，第一部分為氣球尺寸對減噪頻段的影響，探討適用於低頻打樁噪音的氣球尺寸，第二部分為體積分率對氣球幕減噪效益的影響，量測體積分率與減噪效益間的增益，第三部分比較混和尺寸的氣球幕與統一尺寸氣球幕間減噪的效果，與前兩部分實驗結果比對，並利用線性迴歸分析方式，於判定係數高於0.9之160 Hz到760 Hz頻段，預測體積分率對減噪效益的影響，由預測減噪效果完成參數配置，提供後續實際海域減噪工法的氣球幕設計。 | zh_TW |
| dc.description.abstract | Underwater noise mitigation effect is enhanced with balloon arrays for the stability and noise mitigation effects of bubble curtain in the ocean is limited. The noise mitigation effect is analyzed with bubble resonance theory incorporated into the film theory of the Church mathematical model[1]. Lin et al[2] reported the noise mitigation effects of one-size balloon curtain limited with frequency bandwidth, thus this study uses a balloons of two different radius, i.e. 5 cm and 7 cm, to form an array and its noise mitigation in respective frequency ranges. Result shows that using balloon array composed of balloons of two sizes, the noise mitigation effects are enhanced from 100 Hz to 1000 Hz. Design parameters of the balloon array is also considered while the noise mitigation effects of balloon array in various setup. The first parameter is the balloon size and its effect on the frequency of noise mitigation; The second parameter is the volume fraction and its impact on noise mitigation. The third parameters is the comparison of noise mitigation effect of balloon array composed of mixed sizes and of uniform size, with respect to the balloon size and volume fraction. Finally using linear regression analysis to predict the effect of volume fraction on noise mitigation in the frequency bandwidth of 160 Hz to 760 Hz. The study would provide follow-up design of the balloon array for underwater noise mitigation during pile driving, thus lower the noise impact on the marine environment. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T14:06:48Z (GMT). No. of bitstreams: 1 ntu-104-R02525003-1.pdf: 5518281 bytes, checksum: 3bc28ca7a227aeb0000664772ce2a822 (MD5) Previous issue date: 2015 | en |
| dc.description.tableofcontents | 目錄
誌謝 I 摘要 II ABSTRACT III 符號索引 IV 目錄 VI 圖目錄 VIII 表目錄 XI 第一章 緒論 1 1.1前言 1 1.2研究動機與目的 2 1.3文獻回顧 4 1.4論文架構 5 第二章 理論模式分析減噪效益 6 2.1尺寸對衰減係數理論分析 8 2.2體積分率對衰減係數理論分析 9 2.3 church薄膜理論模式分析 10 2.4 氣球幕實驗參數設定 12 第三章 實驗流程與方法 14 3.1氣球幕製作 14 3.2實驗配置 16 3.3實驗訊號發射端 18 3.4實驗訊號接收端 20 3.5實驗流程 21 第四章 資料處理與減噪結果分析 24 4.1資料處理流程 24 4.2氣球幕尺寸改變之減噪效益分析 27 4.3氣球幕體積分率改變之減噪效益分析 29 4.4混合尺寸氣球幕之減噪效益分析 31 4.5減噪效益之線性迴歸分析 39 第五章 結論與未來建議 45 5.1 結論與建議 45 5.2 實驗設計規範 46 參考文獻 48 | |
| dc.language.iso | zh-TW | |
| dc.title | 氣球幕之水下低頻噪音減噪效益精進研究 | zh_TW |
| dc.title | Study of Underwater Noise Mitigation Enhancement
using Balloon Arrays | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 103-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 宋家驥,邱永盛,魏瑞昌 | |
| dc.subject.keyword | 低頻打樁噪音,減噪工法,氣球幕, | zh_TW |
| dc.subject.keyword | low-frequency piling noise,noise mitigation,balloon array, | en |
| dc.relation.page | 50 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2015-08-20 | |
| 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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