Reflection at the Cut-off and Transmission by Tunnel Effect in a Waveguide with Linear Section Variation
We present experimental and numerical results on the propagation of Lamb waves in duraluminum elastic waveguides whose section is varying linearly from 5 mm to 2 mm. The Lamb mode is generated in the area of 5 mm thickness and is propagating down slope. If the incident Lamb wave propagating down slope reaches its thickness cut-off in the varying section area, it is totally reflected. However, a small part of its energy is transmitted by tunnel effect to the area of 2 mm thickness, and is converted into other Lamb waves. The tunnel length and the energy distribution on the transmitted waves are given as function of frequency. Experimental and numerical results are in good agreements.
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Document Type: Research Article
Publication date: September 1, 2009
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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