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Effect of Phase Shifts on the Directivity of Acoustic Plane Sources

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Abstract:

In this paper the problem of obtaining high directivity radiation from vibrating planar circular sources, located at a finite and an infinite rigid baffle, is analysed. It has been assumed that by modifying the radiating surface shape in a special way obtaining a more coherent acoustic radiation is possible [1, 2]. The phase shift for surface velocity distribution of considered sources has been achieved by an analytical approach. The formulas derived allow to examine such a 'phase correction' effect on directivity of the following acoustic sources: 1. a piston with velocity distribution selected on the basis of previous investigation [3], which gives high directivity radiation, 2. a free vibrating plate clamped at the edge. It has been found that the 'correction' of the vibration velocity phase improves radiation directivity significantly.

Document Type: Research Article

Publication date: 2000-05-01

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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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