Low frequency bottom reverberation in a Pekeris waveguide with Lambert’s rule

Q1 Mathematics

Journal of Computational Acoustics Pub Date : 2015-09-30 DOI:10.1142/S0218396X15500228

M. Ainslie, D. Ellis, C. Harrison

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引用次数: 4

Abstract

The requirement by modern navies to predict sonar performance in shallow water, whether for use in research, planning or operations, led to an initiative for the validation of reverberation models in the form of two Reverberation Modeling Workshops at the University of Texas at Austin in November 2006 and May 2008 [J. S. Perkins and E. I. Thorsos, Update on the reverberation modeling workshops, J. Acoust. Soc. Am. 126 (2009) 2208]. The problem considered here (Problem XI, from the 2006 workshop) requires the computation of reverberation versus time in a Pekeris waveguide with Lambert scattering from the seabed. Results from eigenray, normal mode and (hybrid) continuum methods are presented and compared for the time window 0.05s to 1000s after pulse transmission. Approximate analytical solutions are used to provide insight into the expected behavior of the reverberation and establish regimes of validity of numerical models. In situations where the regimes of validity of different methods coincide, the solutions of models applying these methods overlap. The overlapping solutions agree with each other within ±0.3dB. Their purpose is to provide a baseline against which future model improvements can be assessed and quantified.

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基于朗伯规则的佩克里斯波导低频底混响

现代海军需要预测声纳在浅水中的性能，无论是用于研究、规划还是作战，这导致了2006年11月和2008年5月在德克萨斯大学奥斯汀分校以两次混响建模研讨会的形式验证混响模型的倡议[J]。S. Perkins和E. I. Thorsos，混响建模研讨会的更新，J. Acoust。Soc。[j].中国科学院学报，2009(5):391 - 391。这里考虑的问题(问题十一，来自2006年的研讨会)需要计算海底兰伯特散射的Pekeris波导中混响随时间的变化。给出了脉冲传输后0.05s至1000s时间窗的特征射线、正模和(混合)连续介质方法的结果并进行了比较。近似解析解用于深入了解混响的预期行为，并建立数值模型的有效性制度。在不同方法的有效性一致的情况下，应用这些方法的模型的解决方案重叠。重叠解的一致性在±0.3dB范围内。它们的目的是提供一个基线，以便对未来的模型改进进行评估和量化。

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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.