本文選題：有限元 + 海洋聲傳播　； 參考：《哈爾濱工程大學(xué)》2016年碩士論文

【摘要】：以有限元法為代表的數(shù)值計(jì)算方法能夠用于不規(guī)則海底粗糙海面邊界和不均勻海水介質(zhì)等復(fù)雜海洋環(huán)境下的聲傳播問(wèn)題,在水下聲場(chǎng)計(jì)算和特性分析方面受到越來(lái)越多的關(guān)注。本論文從有限元算法求解波動(dòng)方程的基本理論推導(dǎo)開(kāi)始,以通用型有限元軟件Comsol Multiphysics 5.0中的聲學(xué)模塊為仿真平臺(tái),建立低頻點(diǎn)源聲傳播模型,實(shí)現(xiàn)基于有限元算法的聲場(chǎng)計(jì)算。二維聲傳播研究中,標(biāo)準(zhǔn)楔形流體海底波導(dǎo)問(wèn)題一直被用做檢驗(yàn)聲傳播模型準(zhǔn)確與否的基本模型。本文首先建立流體海底COMSOL模型,通過(guò)比對(duì)表明了 COMSOL模型有限元結(jié)果的準(zhǔn)確性;接著建模仿真彈性海底情況下低頻點(diǎn)源的聲傳播情況,綜合對(duì)比分析了剪切波對(duì)聲傳播的影響以及傳播過(guò)程中出現(xiàn)的界面波現(xiàn)象。實(shí)際海洋聲傳播環(huán)境為空間變化的三維環(huán)境,本文將COMSOL模型推廣到三維理想波導(dǎo)并對(duì)傳播特性做了分析。除上述內(nèi)容以外,本文還分別對(duì)COMSOL軟件在二維和三維模型中的計(jì)算效率和計(jì)算機(jī)硬件消耗做了對(duì)比,研究了 PML的最佳適用范圍,并通過(guò)軟件提供的APP開(kāi)發(fā)器建立了三維水平理想波導(dǎo)的聲場(chǎng)模型APP應(yīng)用,為以COMSOL為代表的商業(yè)有限元軟件更好地應(yīng)用于實(shí)際聲傳播問(wèn)題提供了新思路。
[Abstract]:The numerical method represented by finite element method (FEM) can be applied to the acoustic propagation in complex marine environments such as irregular seabed rough sea surface boundary and inhomogeneous seawater medium. More and more attention has been paid to the underwater acoustic field calculation and characteristic analysis. Starting from the basic theory of solving wave equation by finite element method, the acoustic module in Comsol Multiphysics 5.0 is used as the simulation platform, and the acoustic propagation model of low frequency point source is established, and the sound field calculation based on finite element algorithm is realized in this paper. In the study of two-dimensional acoustic propagation, the problem of standard wedge-shaped fluid subsea waveguide has been used as the basic model to verify the accuracy of acoustic propagation model. In this paper, first of all, the finite element results of the COMSOL model are proved to be accurate by comparison, and the sound propagation of the low frequency point source under the elastic seabed is modeled and simulated. The influence of shear wave on acoustic propagation and the phenomenon of interfacial wave in the process of propagation are compared and analyzed. The actual ocean acoustic propagation environment is a three-dimensional environment with spatial variation. In this paper, the COMSOL model is extended to the three-dimensional ideal waveguide and the propagation characteristics are analyzed. In addition to the above contents, the computational efficiency and computer hardware consumption of COMSOL software in two-dimensional and three-dimensional models are compared, and the optimal application range of PML is studied. The application of the sound field model of the 3D horizontal ideal waveguide is established by using the app developer provided by the software, which provides a new idea for the commercial finite element software, which is represented by COMSOL, to better apply to the practical sound propagation problem.
【學(xué)位授予單位】：哈爾濱工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：P733.21

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 莫亞梟;樸勝春;張海剛;李麗;;水平變化波導(dǎo)中的簡(jiǎn)正波耦合與能量轉(zhuǎn)移[J];物理學(xué)報(bào);2014年21期

2 李凡;郭新毅;張毅;胡濤;;水下聲傳播的發(fā)展及其應(yīng)用[J];物理;2014年10期

3 莫亞梟;樸勝春;張海剛;李麗;;復(fù)等效深度耦合簡(jiǎn)正波模型[J];聲學(xué)學(xué)報(bào);2014年04期

4 張海剛;樸勝春;楊士莪;安旭東;;楔形彈性海底聲矢量場(chǎng)分布規(guī)律研究[J];聲學(xué)學(xué)報(bào);2011年04期

5 盧曉亭;張林;;水聲傳播建模研究現(xiàn)狀綜述[J];海洋技術(shù);2010年04期

6 張海剛;樸勝春;楊士莪;;水中甚低頻聲源激發(fā)海底地震波的傳播[J];哈爾濱工程大學(xué)學(xué)報(bào);2010年07期

7 鹿力成;馬力;陳耀明;;淺海海底模型對(duì)低頻聲傳播的影響[J];聲學(xué)技術(shù);2007年05期

8 潘文峰;尤云祥;繆國(guó)平;;二維海洋波導(dǎo)中Helmholtz方程外問(wèn)題數(shù)值解的有限元方法[J];上海交通大學(xué)學(xué)報(bào);2006年11期

9 陳云飛,呂俊軍,于l，

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