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The performance of acoustic hoods at low frequencies

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An investigation has been made into the performance of acoustic hoods at low frequencies, in the range where difficulties are often encountered in obtaining adequate attenuation. The problem has been analysed for the case of one dimension and, with the aid of small boxes and panels, the solution is shown to be of practical value. The importance of having a sealed enclosure with stiff walls is illustrated, and several methods of introducing wall rigidity have been investigated. When consideration need only be given to higher frequencies, limp wall techniques may be used to advantage, providing adequate mechanical damping resides in the system. Methods of introducing wall damping have been investigated and discussed, and some further factors influencing the low frequency performance are included. It is concluded that further research into devising highly damped stiff structures would be advantageous.
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Document Type: Research Article

Publication date: January 1, 1962

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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