Reducing Screen-Induced Refraction of Noise Barriers in Wind by Vegetative Screens
Abstract:The efficiency of noise barriers in downwind direction is strongly reduced by refraction of sound. This effect has been analysed by many authors both in calculations and in experiments. The question arises whether it is possible to influence the wind-factor and to what extent the performance of the barrier could eventually be increased. This paper reports on a wind tunnel experiment set up to try to answer this question. The experiment focuses on the insertion loss close to the barrier (up to a distance of 10 times the barrier height). A model at scale 1/20 is constructed. Both single and double noise barrier (i.e. a noise barrier on either side of the source) configurations are tested, in combination with windscreens. Scale models of vegetative screens are used to modify wind profiles close to the noise barrier. The positive effect on barrier performance is of the order of a few dB. Although this effect may seem small at first sight, it can be obtained at virtually no additional cost and therefore is of practical interest.
Document Type: Research Article
Publication date: 2002-03-01
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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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