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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73544完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 黃維信 | |
| dc.contributor.author | Chao-Hung Chen | en |
| dc.contributor.author | 陳朝宏 | zh_TW |
| dc.date.accessioned | 2021-06-17T07:41:06Z | - |
| dc.date.available | 2019-02-19 | |
| dc.date.copyright | 2019-02-19 | |
| dc.date.issued | 2019 | |
| dc.date.submitted | 2019-02-14 | |
| dc.identifier.citation | [1] Nowacek D P , Thorne L H, Johnston D W, Tyack P L. Responses of cetaceans to anthropogenic noise, Mammal Review, 37 (2), pp.81–115,2007
[2] Lighthill M J, “On the sound generated aerodynamically. Part I: General theory”, Proceeding of the Royal Society of London A, 211, pp. 321-342, 1952. [3] Curle N, “The Influence of Solid Boundaries upon Aerodynamics Sound”, Proceeding of the Royal Society of London A, 231, pp. 505-514, 1955 [4] Ffowcs Williams, J E. and Hawkings D L, “Sound Generation by Turbulence and Surfaces in Arbitrary Motion”, Philosophical Transactions of The Royal Society A, Mathematical Physical and Engineering Sciences, 264, pp. 321-342, 1969 [5] Farassat F, “Linear Acoustic Formulas for Calculation of Rotating Blade Noise,” AIAA Journal, Vol. 19, No. 9, 1981 [6] Farassat F and Succi G P, “The Prediction of Helicopter Rotor Discrete Frequency Noise,” Vertica, Vol. 7, No. 4, 1982 [7] Brentner K S, “Prediction of Helicopter Rotor Discrete Frequency Noise,” NASA Technical Memorandum 87721, Oct, 1986 [8] Brentner K S, and Farassat F, “An Analytical Comparison of the Acoustic Analogy and Kirchhoff Formulations for Moving Surfaces,” AIAA Journal, Vol. 36, No. 8, Aug. 1998 [9] Farassat F, “Derivation of formulations 1 and 1A of Farassat,” Technical Report No. TM-2007-214853, NASA, 2007. [10] Wolf W R, Lele SK, Wideband fast multipole boundary element method: application to acoustic scattering from aerodynamic bodies,2011 [11] P Kellet, O Turan, A Incecik. A study of numerical ship underwater noise prediction Ocean Eng, pp. 113-120,2013 [12] Ianniello S, Muscari R, Di Mascio, A Ship underwater noise through the acoustic analogy. Part I: Nonlinear analysis of a marine propeller in a uniform flow. J. Mar. Sci. Tech., 18, pp.547–570, 2013 [13] Dowling A P and Ffowcs Williams J E, “Sources of sound”, Chapter 7 in Sound and Sources of Sound, Ellis Horwood limited, Chichester, 1983 [14] The MathWorks, Inc., “Matlab function reference,” The MathWorks, Inc., 2015 | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73544 | - |
| dc.description.abstract | 本文係經由雷諾平均方程(RANS)的軟體計算出的暫態螺槳流場作為發出聲壓訊號的聲源，分別使用Ffowcs Williams-Hawkings(FW-H)聲波方程式計算螺槳葉片表面上所產生的噪音及可滲透表面轉換 (Porous Formulation)定義一圓柱發聲體包覆螺槳及周圍流場所產生的噪音，定義兩個不同的表面函數計算出聲壓值。其中，使用了有限差分法（Finite Difference Method）與數值積分法取代了方程式中的偏微分項與積分。為了驗證程式碼的可靠性，本文以點源流建立了假想的無黏流場函數代入FW-H聲波方程中，以驗證數值方法的準確性。再將所取得的暫態螺槳流場資料使用勢流理論中的鏡像法(Method of Images)建立自由液面的邊界條件，並使用可滲透表面轉換式模擬出螺槳在水下對於遠場觀測點所造成的聲壓變化。 | zh_TW |
| dc.description.abstract | The objective of this thesis is to simulate the acoustic pressure field of a marine propeller. The unsteady flow field of a marine propeller is generated by RANS. Two methods are used for calculating acoustic pressure in this thesis, fowcs Williams-Hawkings (FW-H) analogy and Porous Formulation. The differential terms and integrals in the formulations are approximated by Finite difference and numerical integration. At beginning, this thesis uses an inviscid function generated by a point source to verify the method based on FW-H. At last, this thesis uses the method of images in the Potential theory to set up a free surface boundary condition, and uses Porous Formulation to calculate sound pressure of an underwater marine propeller. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-17T07:41:06Z (GMT). No. of bitstreams: 1 ntu-108-R05525017-1.pdf: 1811213 bytes, checksum: bc2a1a1af4c55627d402e469cf97dabe (MD5) Previous issue date: 2019 | en |
| dc.description.tableofcontents | 目錄
口試委員會審定書 # 致謝 I 摘要 II ABSTRACT III 目錄 IV 圖目錄 VI 表目錄 VIII 第一章 緒論 1 1.1 研究動機及背景 1 1.2 文獻回顧 2 1.3 研究目的與方法 5 第二章 基本理論 6 2.1 統御方程式 6 2.1.1 連續方程式 6 2.1.2 動量方程式 6 2.1.3 能量方程式 7 2.2 聲學類比理論 7 2.2.1 Ffowcs Williams-Hawkings 類比(FW-H) 8 2.2.2 可滲透表面轉換(Porous Formulation) 14 2.3 數值方法 18 2.3.1 有限差分法（Finite Difference Method） 19 2.3.2 數值積分法 20 第三章 螺槳流場數值計算 21 3.1 聲壓級定義 21 3.2 螺槳流場 21 3.3 演算法運算流程 24 3.4 演算法的驗證 26 3.4.1 Ffowcs Williams-Hawking類比演算法驗證 26 3.4.2 Porous Formulation(PF)類比演算法驗證 33 3.5 不同演算法之結果 36 3.5.1 可滲透表面流場之噪音 36 3.5.2 螺槳葉片噪音 47 3.6 自由液面條件下之計算結果 52 3.6.1 鏡像法程式驗證 52 3.6.2 計算結果 56 第四章 結論與展望 63 4.1 結論 63 4.2 展望 63 參考文獻 65 附錄 A 67 A.1 自由空間的格林方程式 67 A.2 推導多個源點在一移動表面上之波動方程式之解 67 | |
| dc.language.iso | zh-TW | |
| dc.subject | 螺槳 | zh_TW |
| dc.subject | Ffowcs Williams-Hawkings聲學類比 | zh_TW |
| dc.subject | 可滲透表面轉換 | zh_TW |
| dc.subject | 有限差分法 | zh_TW |
| dc.subject | 數值積分法 | zh_TW |
| dc.subject | 聲壓 | zh_TW |
| dc.subject | Porous Formulation | en |
| dc.subject | Ffowcs Williams-Hawkings analogy | en |
| dc.subject | Marine propeller | en |
| dc.subject | Acoustic pressure | en |
| dc.subject | Numerical integration | en |
| dc.subject | Finite Difference Method | en |
| dc.title | 運用可滲透表面轉換計算螺槳流場噪音 | zh_TW |
| dc.title | Computing the radiating noise of a marine propeller by porous formulation | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 107-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王昭男,謝傳璋,辛敬業,鍾孟軒 | |
| dc.subject.keyword | 螺槳,Ffowcs Williams-Hawkings聲學類比,可滲透表面轉換,有限差分法,數值積分法,聲壓, | zh_TW |
| dc.subject.keyword | Marine propeller,Ffowcs Williams-Hawkings analogy,Porous Formulation,Finite Difference Method,Numerical integration,Acoustic pressure, | en |
| dc.relation.page | 72 | |
| dc.identifier.doi | 10.6342/NTU201900574 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2019-02-14 | |
| 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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