lect_32 - Ocean Acoustic Theory • • • • • •...

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Unformatted text preview: Ocean Acoustic Theory • • • • • • Acoustic Wave Equation Integral Transforms Helmholtz Equation Source in Unbounded and Bounded Media Reflection and Transmission The Ideal Waveguide – Image Method – Wavenumber Integral – Normal Modes • Pekeris Waveguide 1 13.853 COMPUTATIONAL OCEAN ACOUSTICS Lecture 3 U(t) a r Vibrating sphere in an infinite fluid medium. 2 13.853 COMPUTATIONAL OCEAN ACOUSTICS Lecture 3 3 13.853 COMPUTATIONAL OCEAN ACOUSTICS Lecture 3 5 13.853 COMPUTATIONAL OCEAN ACOUSTICS Lecture 3 6 13.853 COMPUTATIONAL OCEAN ACOUSTICS Lecture 3 7 13.853 COMPUTATIONAL OCEAN ACOUSTICS Lecture 3 Horizontally stratified environment 8 13.853 COMPUTATIONAL OCEAN ACOUSTICS Lecture 3 9 13.853 COMPUTATIONAL OCEAN ACOUSTICS Lecture 3 10 13.853 COMPUTATIONAL OCEAN ACOUSTICS Lecture 3 11 13.853 COMPUTATIONAL OCEAN ACOUSTICS Lecture 3 50 F = 150 Hz Magnitude 40 30 20 Evanescent Waves Radiating Waves 10 0 0.2 0.4 0.6 0.8 1.0 -1 Horizontal wavenumber (m ) Magnitude of the depth-dependent Green’s function for point source in an infinite medium. Solid curve: z – zs = Ȝ/10; dashed curve: z – zs = 2 Ȝ. 12 13.853 COMPUTATIONAL OCEAN ACOUSTICS Lecture 3 13 13.853 COMPUTATIONAL OCEAN ACOUSTICS Lecture 3 ...
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This note was uploaded on 02/24/2012 for the course MECHANICAL 2.068 taught by Professor Henrikschmidt during the Spring '03 term at MIT.

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lect_32 - Ocean Acoustic Theory • • • • • •...

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