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Reflection with beam displacement from simple barriers

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The problem of reflection with beam displacement from an acoustic barrier, comprising two parallel boundaries, is examined with regard to the relationship between geometric ray paths and the locus of stationary phase points. The beam displacement Δ and reflected field pR are predicted for sound incident from above, first for a perfectly reflecting barrier, and then for a penetrable lower boundary. A series of regularly spaced kinks is shown to appear in the phase of the integrand of the expression for PR. Each kink results in a non-negligible contribution to the field: the condition for these contributions to interfere constructively is shown to be identical to that for the presence of a classical ray. Criteria are set out for the resolution of the various multipath arrivals.

Document Type: Research Article

Publication date: 1996-07-01

More about this publication?
  • 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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