Design Optimisation of Acoustic Absorbers with Cross-Like Pores Via a Homogenisation Method
Mechanical modelling and associated numerical methods are able to improve the design of absorbing materials which are otherwise difficult to accomplish through experimental studies only. In this paper, we provide an original procedure for obtaining high acoustic absorption of single and multi-layered panels with predefined microstructure. The procedure uses the homogenisation technique for obtaining effective properties of an airsaturated material and solution to acoustic problems. We study a certain topology of the material and point out the effect of matrix material stiffness on the results of the optimisation procedure. We demonstrate that for stiff and rigid frames of a single layer, the optimal design parameters do not differ much whereas for the soft frames, the same results may significantly change. Moreover, we show that the absorption properties can be essentially improved by arrangements of different materials (soft, stiff and air) in sandwich panels. It is also possible to design a material which efficiently absorbs acoustic energy at low frequencies which is hard to achieve by means of conventional materials.
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Document Type: Research Article
Publication date: July 1, 2019
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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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