Reflection of a Spherical Sound Wave by an Infinite Elastic Plate with an Air-Back Cavity

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Abstract:

In this paper, the reflection of a spherical sound wave by an infinite elastic plate with an air-back cavity is theoretically investigated. A far-field expression in closed form for the reflected sound field which includes the effects of the plate vibration excited by the surrounding sound field is derived analytically. The energy ratio of the reflected sound wave by an infinite elastic plate to that by an infinite rigid immovable plate is defined. The ratio is found to take the same form as the energy reflection coefficient of an air-cavity backed infinite elastic plate which the authors have previously derived in the case of a plane wave incidence. This is to say that the effects of the parameters relating to the sound reflecting system should appear in the same manner as in the case of plane wave incidence. The effects of the cavity on the sound reflectivity, which is a dip due to the resonance of mass-spring system consisting of the plate and the cavity and dips due to the acoustic resonance of the cavity, are discussed in detail.

Document Type: Research Article

Publication date: November 1, 1997

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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