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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/29596完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳琪芳(Chi-Fang chen) | |
| dc.contributor.author | Chreng-Wei Lin | en |
| dc.contributor.author | 林正偉 | zh_TW |
| dc.date.accessioned | 2021-06-13T01:11:38Z | - |
| dc.date.available | 2012-08-16 | |
| dc.date.copyright | 2011-08-16 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-08-03 | |
| dc.identifier.citation | [1] M. H. Schultz, D. Lee, and K. R. Jackson, 'Application of the Yale sparse technique to solve the three-dimensional parabolic wave equation,' in Recent Progress in the Development and Application of the Parabolic Equation, eds. P. D. Scully-Power and D. Lee, Naval Underwater System Center, TD# 7145, 1984.
[2] F. D. Tappert, 'The parabolic equation method,' in Wave Propagation and Underwater Acoustics, Lecture Notes in Physics, Vol.70, eds. J. B. Killer and J. S. Papadakis (Springer, Berlin, 1977). [3] R. N. Baer, 'Propagation through a three‐dimensional eddy including effects on an array ,' J. Acoust. Soc, Am. vol. 69, pp. 70-75, 1981. [4] J. S. Perkins and R. N. Baer, 'An approximation to the three-dimensional parabolic-equation method for acoustic propagation,' J. Acoust. Soc. Am. , vol. 72, pp. 515-522, 1982. [5] A. Bayliss, C. I. Godlstein, and E. Turkel, 'An interactive method for helmholtz equation,' J. Comp. Phys., vol. 49, pp. 443, 1983. [6] C. I. Goldstein, 'Multigrid preconditioners applied to three-dimensional parabolic equation type models,' in Computational Acoustics - Wave propagation, eds. D. Lee, R. L. Sternberg, and M. H. Schultz (North-Holland, Amsterdam ,1986) pp. 57-74. [7] D. Lee, Y. Saad, and M. H. Schultz, 'An efficient method for solving the tree-dimensional wide angle wave equation,' in Computational Acoustics- Wave propagation, eds. D. Lee, R. L. Sternberg, and M. H. Schultz (North-Holland, Amsterdam ,1986) pp. 75-90. [8] G. Botseas, D. Lee, and D. King , 'FOR3D : A computer model for solving the LSS three-dimensional wide angle wave equation,' Naval Underwater Systems Center, TR#7943 (1987). [9] A. E. Newhall, J. F. Lynch, C. S. Chiu, and J. R. Daughterty, 'Improvements in three-dimensional ray tracing codes underwater acoustics,' in Computational Acoustics - Ocean Acoustic Models and Supercomputing (North-Holland, Amsterdam, 1990) pp. 169-186. [10] C. S. Chiu and L. L. Ehret, 'Computing of sound propagation in a three-dimensional varying ocean: a coupled normal mode approach,' in Computational Acoustics - Ocean Acoustic Models and Supercomputing (North-Holland, Amsterdam, 1990) pp. 187-202. [11] D. Lee and M. H. Schultz, 'Numerical Ocean Acoustic Propagation in Three Dimensions,' 1995. [12] W. L. Siegmann, G. A. Kriegsmann, and D. Lee, 'A wide angle three‐dimensional parabolic wave equation, ' J. Acoust. Soc. Am. vol. 78, pp. 659-664, (1985). [13] S. T. McDaniel and D. Lee, 'A finite‐difference treatment of interface conditions for the parabolic wave equation: The horizontal interface, ' J. Acoust. Soc. Am. vol. 71, pp. 855-858, (1982). [14] A. D. Pierce and D. Lee, 'The Influence of the reference wavenumber in computational ocean acoustics,' in Journal of Computational Acoustics, vol. 1, pp. 77-90, 1993. [15] D. Lee and S. T. McDaniel,'Ocean Acoustic Propagation by Finite Difference Methods,' (Pergamon, Oxford, 1988). [16] C. W. Miller, D. B. Reeder, M. Stone and K. Wyckoff, 'Preliminary results from the Non-Linear Internal Wave Initiative (NLIWI) Acoustics Cruise,' Naval Postgraduate School Technical Report, 2007. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/29596 | - |
| dc.description.abstract | FOR3D程式經常被使用於計算三維的聲場環境。由於其座標為圓柱座標系統，故隨著計算距離遠離聲源時則計算格點間距會逐漸變寬，以至於當計算到達遠場時，無法算得在水文或地形上方位角耦合(θ-coupling)的效應，因此會從原本三維計算變成以N×2D來做計算，若地形或水文變化過大時則不易呈現出聲場能量分佈。此外，在遠場計算時格點數量的不足亦會造成解析度變差。因此吾人想利用在遠場時以內插的方式增加格點，再以內插後的聲場作為初始聲場向下一個聲場繼續作計算，如此一來即使計算距離再遠因為格點增加的關係，使得方位角耦合(θ-coupling)的效應不會被忽略較能呈現聲音能量的分佈情況，且在遠場的解析度亦可改善。本文的重點在於當計算距離超過所設定的門檻距離時，如何做內插增加格點使得聲場的三維效應完整呈現。 | zh_TW |
| dc.description.abstract | FOR3D has been used to simulate sound propagation. The system of FOR3D is cylindrical coordinate. While it computes away from source, the distance between two grid points become too large to catch θ-coupling effect and the 3D transfers to Nx2D . Moreover, the resolution becomes low because of less grid points. The main idea to improve the limitation is increasing grid points in the far field. Hence, the θ-coupling terms would not be ignored. The study in this thesis is how to decide the re-grid distance and how to deal with the sound field after re-grid. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T01:11:38Z (GMT). No. of bitstreams: 1 ntu-100-R98525047-1.pdf: 3425870 bytes, checksum: 460b7fca01939d24b3b8cacea036fd4f (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | 誌謝 2
中文摘要 3 ABSTRACT 4 目錄 5 圖目錄 7 符號目錄 9 第 1章 緒論 10 1.1 前言 10 1.2 文獻回顧 10 1.3 研究動機及目的 14 1.4 論文架構 15 第 2章 研究方法 16 2.1 Lee-Saad-Schultz (LSS)數學模式: 16 2.2 數值解: 18 2.3 門檻值 S 的定義 23 2.4 FOR3D程式架構 25 2.5 增加格點的技術 27 第 3章 算例驗證 29 3.1 斜坡地形計算驗證 29 3.2 含曲度內波水文環境聲壓位準比較 32 3.3 峽谷地形聲壓位準比較 35 第 4章 結果與討論 39 4.1 s數值討論 39 4.2 結果與未來工作 41 參考文獻 42 | |
| dc.language.iso | zh-TW | |
| dc.subject | 三維效應 | zh_TW |
| dc.subject | 方位角耦合 | zh_TW |
| dc.subject | 3D effect | en |
| dc.subject | θ-coupling | en |
| dc.title | 三維數值模擬之格點重訂技術 | zh_TW |
| dc.title | Adaptive azimuth re-grid technique for 3D PE modeling | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 謝傳璋,謝力文,邱永盛 | |
| dc.subject.keyword | 方位角耦合,三維效應, | zh_TW |
| dc.subject.keyword | θ-coupling,3D effect, | en |
| dc.relation.page | 43 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2011-08-03 | |
| 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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