Three-dimensional coupled mode analysis of internal-wave acoustic ducts
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Schmidt_Three-dimensional.pdf
Size
2.9 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Shmelev, Alexey A.
Lynch, James F.
Lin, Ying-Tsong
Schmidt, Henrik
Date Issued
May 2014
Journal
The Journal of the Acoustical Society of America
Publisher
American Institute of Physics (AIP)
Citation
Shmelev, Alexey A., James F. Lynch, Ying-Tsong Lin, and Henrik Schmidt. “Three-Dimensional Coupled Mode Analysis of Internal-Wave Acoustic Ducts.” The Journal of the Acoustical Society of America 135, no. 5 (May 2014): 2497–2512. © 2014 Acoustical Society of America
Version
Final published version
Abstract
A fully three-dimensional coupled mode approach is used in this paper to describe the physics of low frequency acoustic signals propagating through a train of internal waves at an arbitrary azimuth. A three layer model of the shallow water waveguide is employed for studying the properties of normal modes and their coupled interaction due to the presence of nonlinear internal waves. Using a robust wave number integration technique for Fourier transform computation and a direct global matrix approach, an accurate three-dimensional coupled mode full field solution is obtained for the tonal signal propagation through straight and parallel internal waves. This approach provides accurate results for arbitrary azimuth and includes the effects of backscattering. This enables one to provide an azimuthal analysis of acoustic propagation and separate the effects of mode coupled transparent resonance, horizontal reflection and refraction, the horizontal Lloyd's mirror, horizontal ducting and anti-ducting, and horizontal tunneling and secondary ducting.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1121/1.4869847
