Vol. 27 No. 44 (2012): Acústica e Vibrações 44

Editorial

This special issue of Revista Acústica e Vibrações, again edited by the Board of SOBRAC – North Regional, is entirely composed of articles selected from the Annals of the XXIV Congress of the Brazilian Society of Acoustics (SOBRAC 2012), held by
first time in the North region, in Belém-PA, from May 29 to June 01, 2012.

For the composition of the journal, articles from all sessions of the event were chosen, based on the evaluations of the reviewers of the Scientific Committee of SOBRAC 2012.

The participants of SOBRAC 2012 considered the event a real success, so this special issue of the Journal comes to crown all the effort undertaken, from the collection of some of the main articles that contributed most to raising the technical-scientific level of the Event.

The editors take advantage of this space to, once again, thank everyone who, in person or not, contributed to the success achieved in the realization of SOBRAC 2012 and hopes that the next event will be even bigger, in order to mark a continuous growth and solid foundation of our Brazilian Acoustic Society.

Newton Sure Soeiro
Gustavo da Silva Vieira de Melo

Summary content:

• Technical norms and the responsibility of professionals working in acoustics;
• A methodology for virtual estimation of occupational noise exposure dose;
• Prediction of the loss factor of fuselage panels with viscoelastic materials using the theory of periodic structures and the finite element method;
• Vibroacoustic numerical analysis to predict sound pressure levels on the back of an electrical reactor;
• Evaluation of participation in a comparison of laboratories for sound absorption tests in tubes;
• Electroacoustic modeling of loudspeakers used as active sound absorbers;
• Characterization of sound absorption of corrugated acoustic barriers;
• Behavior of grooved and perforated panels incorporating synthetic foams;
• Analysis of urban acoustics in the neighborhood of Lagoa Nova, Natal/RN;
• Assessment of intelligibility in elementary school classrooms based on binaural impulsive responses obtained with an artificial infant head; and
• Evaluation of the acoustic performance of a traffic noise reduction device.