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Authors = Tuomas Hänninen

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13 pages, 3118 KiB  
Article
Angle-Dependent Absorption of Sound on Porous Materials
by Jose Cucharero, Tuomas Hänninen and Tapio Lokki
Acoustics 2020, 2(4), 753-765; https://doi.org/10.3390/acoustics2040041 - 16 Oct 2020
Cited by 18 | Viewed by 6959
Abstract
Sound-absorbing materials are usually measured in a reverberation chamber (diffuse field condition) or in an impedance tube (normal sound incidence). In this paper, we show how angle-dependent absorption coefficients could be measured in a factory-type setting. The results confirm that the materials have [...] Read more.
Sound-absorbing materials are usually measured in a reverberation chamber (diffuse field condition) or in an impedance tube (normal sound incidence). In this paper, we show how angle-dependent absorption coefficients could be measured in a factory-type setting. The results confirm that the materials have different attenuation behavior to sound waves coming from different directions. Furthermore, the results are in good agreement with sound absorption coefficients measured for comparison in a reverberation room and in an impedance tube. In addition, we introduce a biofiber-based material that has similar sound absorption characteristics to glass-wool. The angle-dependent absorption coefficients are important information in material development and in room acoustics modeling. Full article
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17 pages, 806 KiB  
Article
Influence of Sound-Absorbing Material Placement on Room Acoustical Parameters
by Jose Cucharero, Tuomas Hänninen and Tapio Lokki
Acoustics 2019, 1(3), 644-660; https://doi.org/10.3390/acoustics1030038 - 7 Aug 2019
Cited by 42 | Viewed by 13907
Abstract
The reverberation of a room is often controlled by installing sound absorption panels to the ceiling and on the walls. The reduced reverberation is particularly important in classrooms to maximize the speech intelligibility and in open-plan offices to make spaces more pleasant. In [...] Read more.
The reverberation of a room is often controlled by installing sound absorption panels to the ceiling and on the walls. The reduced reverberation is particularly important in classrooms to maximize the speech intelligibility and in open-plan offices to make spaces more pleasant. In this study, the impact of the placement of the absorption material in a room was measured in a reverberation room and in a mockup classroom. The results show that absorption material is less efficient if it is mounted to the corners or on the edges between the walls and ceiling, if the sound field is more or less diffuse. If the room modes dominate the sound field, the most efficient location for the sound-absorbing material was found at one of the surfaces causing the modes. The results help acoustical consultants to place the absorption material in optimal locations and, generally, minimize the amount of material and save costs. Full article
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