Conference_programme: 18: Room acoustics

Lecture: The acoustic properties of spatial absorbing systems – a model approach

Author(s): Baruch Katarzyna, Majchrzak Aleksandra, Brawata Krzysztof, Kamisiński Tadeusz

Summary:
Spatial acoustic systems have been successfully applied in diverse interiors for years, especially when the use of an acoustic ceiling is impossible and a free access to the roof space is required. These systems are used in industrial production halls, sport facilities, multi-functional rooms and entrance halls equally successfully. The only difficulty in the use of spatial acoustic systems is that defining their absorbing properties is possible by measurement only. Because of the costs involved in conducting this kind of research, the possibility to measure multiple setups is limited, so the producers usually provide acoustic parameters of a few chosen versions only. \nRecently, the architects keep resigning from the standard distribution of the elements in rows, as space systems allow creating visually interesting forms, being not only functional, but also a part of the room decoration. This is where the challenge for acousticians begins – without the measurements it is unknown how this untypical structures absorb the sound and as a consequence influence the acoustics of an interior.\nTo solve this problem, the authors performed the measurements of sound absorption by baffle-type systems, taking into account different geometrical setups. The paper discusses the influence of the geometry of chosen configurations on the sound absorption of the system and the distribution of acoustic field. Moreover, different approaches of analyzing the problem were involved, i.e. scale models, image-source and ray-tracing methods as well as Finite Elements Method (FEM). It was pointed out that some untypical setups are favorable for the rate of number of elements and sound absorption of a system in comparison to the traditional distribution of elements. A consistency between different models and full size actual systems properties was also confirmed. \n

Corresponding author

Name: Ms Katarzyna Baruch

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Country: Poland