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The Effects of Mechanical Coupling on the Beam Pattern of a Multi-element Array

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Abstract:

The paper presents a new method of side lobes reduction in a multi-element linear array. What sets it apart from other methods e.g. weighting the aperture of the elements, weighting the amplitude and phase of the signal transmitted (received) by the elements [1], is that the distribution of vibrations on the array's aperture is the result of mechanical coupling between the elements. The article discusses the results of tests and simulations involving several models of arrays made up of five acoustically insulated elements, coupled with metal separators of varying thickness. The study confirmed that by choosing the right type of material and its thickness, we could reduce the side lobes of an array beam pattern to −20 dB in relation to the main lobe level.

Document Type: Research Article

Publication date: September 1, 2002

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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dav/aaua/2002/00000088/00000005/art00050
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