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Title: On the Use of Perforated Sound Absorption Systems for Variable Acoustics Room Design
Authors: Pereira, Andreia 
Gaspar, Anna 
Godinho, Luís 
Amado-Mendes, Paulo 
Mateus, Diogo 
Carbajo, Jesus
Ramis, Jaime
Poveda, Pedro
Keywords: room acoustics; sound absorption; analytical approach; ray tracing; perforated sound absorbent systems; variable acoustics design
Issue Date: 2021
Publisher: MDPI
Project: project ADJUST—Development of acoustic panels progressively adjustable with smart acting—SII & DT Project CENTRO-01-0247-FEDER-033884 
CENTRO-01-0145-FEDER-000006 (SUSpENsE) 
Serial title, monograph or event: Buildings
Volume: 11
Issue: 11
Abstract: An important challenge for acoustic engineers in room acoustics design is related to the acoustic performance of multi-purpose auditoriums, which are typically designed to suit several performance requirements. With this intent, the analysis of several scenarios is usually performed individually, and then an acceptable solution, that may be adapted to several situations, is selected. One way of providing a more appropriate acoustic performance for each function of the auditorium is using variable sound absorption techniques to control reverberation and other relevant acoustic phenomena associated to sound perception. In this paper, the acoustic behavior of a perforated system that may be suitable for achieving a variable acoustic solution for room acoustic design is addressed. In the design of a cost-effective solution, the surface appearance is kept unchanged, while variable acoustic behavior is achieved either by closing the holes in the back face of the perforated panel or by placing a porous material in varying positions inside the backing cavity, thus accomplishing different acoustic requirements within a multipurpose auditorium. An analytical approach, based on the transfer matrix method is employed for preliminary acoustic sound absorption assessment provided by the system and to develop optimized solutions. Diffuse sound absorption is then computed and used to simulate, by the ray-tracing method, the acoustic behavior of a multipurpose auditorium to demonstrate efficient acoustic performance for different types of use.
ISSN: 2075-5309
DOI: 10.3390/buildings11110543
Rights: openAccess
Appears in Collections:I&D ISISE - Artigos em Revistas Internacionais

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