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The Effect on Room Acoustical Parameters Using a Combination of Absorbers and Diffusers—An Experimental Study in a Classroom

Acoustics (Basel, Switzerland), 2020-07, Vol.2 (3), p.505-523 [Peer Reviewed Journal]

ISSN: 2624-599X ;EISSN: 2624-599X ;DOI: 10.3390/acoustics2030027

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  • Title:
    The Effect on Room Acoustical Parameters Using a Combination of Absorbers and Diffusers—An Experimental Study in a Classroom
  • Author: Arvidsson, Emma ; Nilsson, Erling ; Hagberg, Delphine Bard ; Karlsson, Ola J. I.
  • Subjects: Building Technologies ; Civil Engineering ; Engineering and Technology ; Fluid Mechanics and Acoustics ; Husbyggnad ; Maskinteknik ; Mechanical Engineering ; room acoustics ; Samhällsbyggnadsteknik ; sound absorption ; sound diffusion ; sound scattering ; sound strength ; speech clarity ; Strömningsmekanik och akustik ; Teknik
  • Is Part Of: Acoustics (Basel, Switzerland), 2020-07, Vol.2 (3), p.505-523
  • Description: Several room acoustic parameters have to be considered in ordinary public rooms, such as offices and classrooms, in order to present the actual conditions, thus increasing demands on the acoustic treatment. The most common acoustical treatment in ordinary rooms is a suspended absorbent ceiling. Due to the non-uniform distribution of the absorbent material, the classical diffuse field assumption is not fulfilled in such cases. Further, the sound scattering effect of non-absorbing objects such as furniture are considerable in these types of rooms. Even the directional characteristic of the sound scattering objects are of importance. The sound decay curve in rooms with absorbent ceilings often demonstrate a double slope. Thus, it is not possible to use reverberation time as room parameter as a representative standalone acoustic measure. An evaluation that captures the true room acoustical conditions therefore needs supplementary parameters. The aim of this experimental study is to show how various acoustical treatments affect reverberation time T20, speech clarity C50 and sound strength G. The experiment was performed in a mock-up of a classroom. The results demonstrated how absorbers, diffusers and scattering objects influence room acoustical parameters. It is shown that to some extent the parameters can be adjusted individually by using different treatments or combination of treatments. This allows for the fine-tuning of the acoustical conditions, in order to fulfill the requirements for achieving a high-quality sound environment.
  • Publisher: MDPI AG
  • Language: English;Swedish
  • Identifier: ISSN: 2624-599X
    EISSN: 2624-599X
    DOI: 10.3390/acoustics2030027
  • Source: SWEPUB Freely available online
    ProQuest Central
    DOAJ Directory of Open Access Journals
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