Computing Acoustic Transmission Loss Using 3D Gaussian Ray Bundles in Geodetic Coordinates

Q1 Mathematics

Journal of Computational Acoustics Pub Date : 2016-03-22 DOI:10.1142/S0218396X16500077

Sean Reilly, G. Potty, Michael Goodrich

引用次数: 5

Abstract

This paper defines a new three-dimensional (3D) Gaussian ray bundling model in geodetic coordinates: latitude, longitude, and altitude. Derivations are provided for 3D refraction, 3D interface reflection, 3D eigenray detection, and a 3D variant of the Comprehensive Acoustic System Simulation (CASS)/Gaussian Ray Bundling (GRAB) model. This approach allows environmental parameters and their derivatives are computed directly in latitude, longitude, and depth directions without reducing the problem to a series of N ×2D Cartesian projections. Our model supports 3D effects such as great circle routes and horizontal refraction in sloped environments. Key test results are included for ray path refraction accuracy using a Munk profile, Gaussian beam projection into the shadow zone for an n2 linear profile, and horizontal refraction from a 3D analytic wedge. Testing to date indicates that this approach has accuracy at least as good as CASS/GRAB, but with improved execution speed benefits for large numbers of target...

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在大地坐标系下用三维高斯射线束计算声传输损失

本文定义了一种新的三维(3D)高斯射线束模型在大地坐标系:纬度，经度和高度。提供了三维折射、三维界面反射、三维特征射线检测和综合声学系统模拟(CASS)/高斯射线束(GRAB)模型的三维变体的推导。这种方法允许在纬度、经度和深度方向上直接计算环境参数及其导数，而不会将问题简化为一系列N ×2D笛卡尔投影。我们的模型支持3D效果，如大圆路线和水平折射在倾斜的环境。主要测试结果包括使用Munk剖面的射线路径折射精度，n2线性剖面的高斯光束投影到阴影区，以及3D解析楔的水平折射。迄今为止的测试表明，这种方法的准确性至少与CASS/GRAB一样好，但在大量目标的执行速度上有所提高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Computational Acoustics 物理-声学

CiteScore

3.90

自引率

0.00%

发文量

审稿时长

4.5 months

期刊介绍： Currently known as Journal of Theoretical and Computational Acoustics (JTCA).The aim of this journal is to provide an international forum for the dissemination of the state-of-the-art information in the field of Computational Acoustics. Topics covered by this journal include research and tutorial contributions in OCEAN ACOUSTICS (a subject of active research in relation with sonar detection and the design of noiseless ships), SEISMO-ACOUSTICS (of concern to earthquake science and engineering, and also to those doing underground prospection like searching for petroleum), AEROACOUSTICS (which includes the analysis of noise created by aircraft), COMPUTATIONAL METHODS, and SUPERCOMPUTING. In addition to the traditional issues and problems in computational methods, the journal also considers theoretical research acoustics papers which lead to large-scale scientific computations. The journal strives to be flexible in the type of high quality papers it publishes and their format. Equally desirable are Full papers, which should be complete and relatively self-contained original contributions with an introduction that can be understood by the broad computational acoustics community. Both rigorous and heuristic styles are acceptable. Of particular interest are papers about new areas of research in which other than strictly computational arguments may be important in establishing a basis for further developments. Tutorial review papers, covering some of the important issues in Computational Mathematical Methods, Scientific Computing, and their applications. Short notes, which present specific new results and techniques in a brief communication. The journal will occasionally publish significant contributions which are larger than the usual format for regular papers. Special issues which report results of high quality workshops in related areas and monographs of significant contributions in the Series of Computational Acoustics will also be published.