Optimisation of Low-Height Noise Barriers using the Equivalent Sources Method
Abstract:In this paper the equivalent sources method is shown to be applicable to a noise barrier problem. The agreement with a boundary element model and an analytical model was shown to be very good for a simple case up to 2 kHz. In this case only a few sources were used in the equivalent sources model. To optimise a barrier's insertion loss for a given height by modifying the boundary conditions is difficult, with existing methods. By using the equivalent sources method such an optimisation can be performed in a straight-forward manner. The outcome of the optimisation procedure is an optimised barrier surface impedance. The optimisation procedure is here exemplified on a 1 m tall rectangular barrier, which gives at least 5 dB better insertion loss for low receiver heights and low frequencies than a rigid barrier of equal height. The optimised impedance has a complex shape which makes it difficult to realise in practice. However, it is shown here that insertion loss improvements can be achieved with a simplified impedance. The sensitivity of the insertion loss to disturbances in the optimised impedance and the original source position is shown to be moderate.
Document Type: Research Article
Publication date: 2000-09-01
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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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