O IMPACTO DE CORTINAS, MOBILIÁRIO E VENTILADORES NA QUALIDADE ACÚSTICA DE SALAS DE AULA
Palavras-chave:
Acoustic quality, Classrooms, Early Decay Time, Reverberation TimeResumo
Through the impulse response technique, measurements were performed in 3 classrooms with similar volume but with variations of furniture and fans. For the Reverberation Time (RT) and the Early Decay Time (EDT), the mean of the room per octave band, the standard deviation and the just noticeable difference (JND) were calculated. It was verified that there is heterogeneity between the points measured in the rooms and that is perceptible to its users. Therefore, one should not design a classroom with only the mean value of the acoustic descriptor in mind, since its mean value can be in adherence to the standards and recommendations, but it fails to meet them if verified in specific points. In addition to the reverberation time, it is recommended that other acoustic descriptors should be also evaluated to make the assessment of the room more complete. Operating modes of the room, such as open or closed windows, open or closed curtains and fans turned on or off, end up modifying the acoustic environment and must be taken into account in the acoustic design of rooms in which acoustic quality is essential.
Referências
ABNT ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS. NBR 12179: Tratamentoacústico em recintos fechados - Procedimento. Rio de Janeiro, 1992.
AMORIM, A. E. B.; BERTOLI, S.R. Salas de aula: Comparação de Forma e QualidadeAcústica. In: IX Encontro Nacional e V Latino-americano de Conforto no AmbienteConstruído, 2007, Ouro Preto. Anais... Porto Alegre: ANTAC, 2007. p. 39-48.
ANSI/ASA AMERICAN NATIONAL STANDARDS INSTITUTE/ACOUSTICAL SOCIETY OFAMERICA. S12.60-2010/Part 1 Acoustical Performance Criteria, Design Requirements,and Guidelines for Schools, Part 1: Permanent Schools. 2015.
BB93 Building bulletin 93 Acoustic design of schools: performance standards.
Department for Education. Education Funding Agency. London, 2015.
DIN DEUTSCHE INSTITUT FÜR NORMUNG E.V.. DIN E 18041: Acoustic quality in small tomedium-sized rooms. Berlin, 2004.
IKEDA, C. Y. K.; ONO, R.; VITTORINO, F. A evolução da arquitetura escolar paulista eseu impacto nas condições de exposição ao ruído das salas de aula. In: XIIIEncontro Nacional e IX Encontro Latino-americano de Conforto no AmbienteConstruído, 2015, Campinas. Anais... Porto Alegre: ANTAC, 2015. p. 1-9. Disponívelem: < http://www.infohab.org.br/encac/encac2015_artigos.html>. Acesso em: 19mar. 2018.
ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. ISO 3382-1 Acoustics --Measurement of room acoustic parameters Part 1: Performance spaces. Geneva,2009.
______. ISO 3382-2 Acoustics -- Measurement of room acoustic parameters -- Part 2:Reverberation time in ordinary rooms. Geneva, 2008.
O'KEEFE, J. Acoustical problems in large post-war auditoria. Proceedings of theInstitute of Acoustics; 2002; , v.24. Disponível em: < http://www.akutek.info/Papers/JO_PostWarAuditoria.pdf >. Acesso em: 09 jan. 2013.
KRÜGER, E.L.; ZANNIN, P.H.T. Acoustic, thermal and luminous comfort in classrooms.
Building and Environment 2004;39:1055 1063.
LOSSO, M.; VIVEIROS, E. Acoustical Quality in Educational Buildings:Measurements in Brazilian Public Schools. Proceedings: Eleventh InternationalCongresso on Sound and Vibration, St. Petersburg, 2004.
MARSHALL, L.G. An acoustics measurement program for evaluating auditoriumsbased on the early/late sound energy ratio. Journal of the Acoustical Society ofAmerica, 96 (1994) 2251-2261.
Evaluation of an Auditorium. Advances in Acoustics and Vibration, v.2012, p. 1 8,2012. Disponível em: .Acesso em: 09 jan. 2013.
