A Theoretical Model to Investigate the Acoustic Performance of Building Facades in the Low and Middle Frequency Range
Balconies are reported to reduce the noise levels in front of windows in the middle and high frequency ranges. The amount of reduction depends on the geometry of the balcony, its acoustical properties (e.g., damping), and the source position. However, at low frequencies such an improvement cannot be expected because higher sound pressure levels will occur due to resonances in the balcony cavity. The following question arises: In which way do different parameters influence the reduction due to the balcony's effect (i.e. the reduction of the sound pressure in front of the window). The aim of this paper is to provide a prediction model at low and middle frequencies. A theoretical model is presented based on a modal approach and the Rayleigh integral for baffled plates. The results of the model are compared with laboratory scale measurements. The model shows good agreement with measurements and thus can be helpful in determining optimal balcony design, especially at low frequencies.
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Document Type: Research Article
Publication date: 01 July 1998
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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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