Vol. 6 No. 09 (1991): Acústica e Vibrações 09

This issue has five articles, three inserts and general information:

• How to submit a work to Revista Acústica e Vibrações;
• I Brazilian Symposium on Vehicle Acoustics;
• Congresses;
• General news; and
• Published books.

In the scientific articles section, the work “Qualification of the acoustic insulation laboratory at the Federal University of Santa Maria according to the international standard ISO 140”, by Pizzutti and Mutti, presents the acoustic performance of the UFSM laboratory for the analysis of acoustic insulation of walls, frames and windows; next, the article by Sylvio Bistafa draws attention to the problem of noise caused by hydraulic installations in buildings and buildings; Claudio Alvarenga presents the development of shock absorbers through comfort analysis; directly from Chile, and with an article in Spanish, Costabal, Seballos and Matamala present a model to assess the stress caused by noise based on the mechanism proposed by Rahe; Finally, Almeida e Lima Jr. describe the diagnosis of misalignment in disk coupling using real-time spectral analysis.

The inserts section has an article on the effects of noise on human beings, written by Professor Pérides Silva (CEFET Belo Horizonte); an article by Professor Samir Gerges (UFSC) on noise reduction in electric motors; and, finally, a text on the elaboration of the “Seal of Noise”.

Summary content:

• Qualification of UFSM's acoustic insulation laboratory according to ISO 140;
• Awareness of the problem of noise in building hydraulic installations;
• The “stilt and waterfall” effects;
• Development of shock absorber strength through control analysis;
• Noise stress model. An environmental approach to the Rahe scheme;
• Diagnosis of misalignment in a disc coupling, using orbit and frequency spectrum analysis;
• Noise reduction in electric motors; and
• Appliances will have “Noise Seal”.