Acoustical Efficiency of a Sonic Crystal Assisted Noise Barrier
This research work aims at evaluating the acoustic performance of a noise reducing device which combines sonic crystals with a conventional noise barrier. Numerical simulations, using a 2D Boundary Element Method (BEM), are carried out to evaluate their acoustic properties in terms of insertion and reflection losses due to the addition of the sonic crystal elements. The studied so-called sonic crystal assisted noise barrier is 3 m high and 1 m wide and is composed of two periodic bands of scatterers combined with a rigid straight barrier. Resonant cavities are used to produce extra insertion loss at some frequencies of resonance below the band gaps. Improved attenuation properties are found when resonant scatterers (cavities) and absorbent materials are combined. Our results show a significant extra insertion loss due to the addition of the sonic crystal elements for middle and high frequencies of typical road traffic noise. On the other hand, the extra reflection loss is limited.
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Document Type: Research Article
Publication date: May 1, 2013
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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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