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Media type:
E-Article
Title:
How can desks and ceilings influence room acoustic criteria in classrooms? Findings from measurements and wave-based simulations
Contributor:
Fratoni, Giulia;
D'Orazio, Dario
Published:
Acoustical Society of America (ASA), 2024
Published in:
The Journal of the Acoustical Society of America, 155 (2024) 3_Supplement, Seite A127-A128
Language:
English
DOI:
10.1121/10.0027041
ISSN:
0001-4966;
1520-8524
Origination:
Footnote:
Description:
Sound diffusion is essential in achieving the required speech intelligibility criteria in classrooms (T;30, C;50, STI). Predictive formulas employed and recommended by international standards generally rely on the ideal diffuse-field theory, notwithstanding its applicability limitation in most feasible real-world scenarios. Yet, along with the sound-absorbing features of the surfaces, it is crucial to quantify any potential diffraction effect caused by furnishing elements and ceiling treatments. The present work uses acoustic measurements and wave-based numerical models to explore the impact of desk layouts and materials in false ceilings on sound diffusion. The single desk arrangement increases the sound diffusion, here quantified in terms of measured T;30 standard deviation, more than other furniture layouts, e.g., desks arranged in circles. Moreover, preliminary results from acoustic measurements and finite-element analysis show that inhomogeneous treatments of the suspended ceiling – porous and perforated modules – increase sound diffusion through material discontinuity even at low frequencies. The match between predictive formulas, experimental results, and simulations confirms the reliability and accuracy of the acoustic design process when involving diffraction effects.