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Mathematical model for a multichannel active absorption system

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Efficient sound absorption at low frequencies is not always easy to achieve using passive materials like foams or mineral wool, due to the large dimensions of materials required and the wavelength involved at that range. In order to find new solutions for this problem, active methods seems to provide a feasible answer. The work presented here introduces a novel mathematical model for a multichannel active sound absorption system based on the wave separation method of Nishimura. The wave separation method is combined with a modal model of a three-dimensional room in order to obtain the controlling parameters of the active system. Theory and simulations are presented. Simulations of the sound pressure field and frequency response inside a room are presented to show the eff ect of the active absorption system. Also, an array of secondary sources is simulated such that a sound absorption coefficient α can be associated with it, in the same way as passive materials are qualified. For comparison, the presented method is contrasted with classical active noise control strategies.
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Document Type: Research Article

Publication date: November 1, 2013

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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