Archives - Page 2

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  Acústica e Vibrações 26

  Vol. 15 No. 26 (2000)

  Summary content:

  • An examination of proposed revisions to the reference curves (criteria) for noise in rooms;
  • Updating of studies on noise within the environmental urban plan of the city of Buenos Aires; and
  • State of the art for solving vibroacoustics problems by numerical methods.
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  Acústica e Vibrações 25

  Vol. 15 No. 25 (2000)

  Summary content:

  • Effect of noise on sleeping and awake men;
  • Total loss factor in buildings acoustics – measurement and application;
  • Room Noise Criteria: the state-of-the-art in the year 2000;
  • Noise pollution: a survey of data from the city of Fortaleza; and
  • NBR-10151-2000: revision of the standard.
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  Acústica e Vibrações 24

  Vol. 14 No. 24 (1999)

  Summary content:

  • Definition of noise targets for vehicle components via analysis of the vehicle's acoustic quality;
  • Study of the sound intensity technique: Procedures, errors, and applications;
  • Noise in the industry – How to control it; and
  • Noise generation in control valves.
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  Acústica e Vibrações 23

  Vol. 14 No. 23 (1999)

  Summary content:

  • Diagnoses of HLIB (Hearing Loss Induced by Occupational Noise) by the new NR-7 (Ordinance 19 Mtb. of 09/04/98);
  • Comparing bananas with oranges;
  • Hearing protectors: A new NRRsf; and
  • A practical case: Silencer for Roots.
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  Acústica e Vibrações 22

  Vol. 13 No. 22 (1998)

  Summary content:

  • Laboratory Comparison in Measurement of Sound Absorption in Reverberant Chambers;
  • Annoying Noise Generated in Building Hydraulic Installations and the Need for Brazilian Standardization;
  • European Policies on Environmental Noise and the Iberian Space; and
  • Measurement and Evaluation of Noise in the Work Environment.
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  Acústica e Vibrações 21

  Vol. 13 No. 21 (1998)

  Summary content:

  • Technological advances in hearing protectors up to 1995: Active noise reduction, frequency/amplitude-sensitivity and uniform attenuation; and
  • Acoustic quality in panoramic offices: Use of electronic masking systems.
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  Acústica e Vibrações 20

  Vol. 12 No. 20 (1997)

  Summary content:

  • New developments in International Standardization;
  • Inserts on national and international congresses; and
  • List of Sobrac members in 1997.
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  Acústica e Vibrações 19

  Vol. 12 No. 19 (1997)

  Summary content:

  • Effects of noise on man;
  • Technological advances in hearing protectors through 1995: active noise reduction, frequency/amplitude sensitivity, and uniform attenuation (Part 1); and
  • Conferences on acoustics
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  Acústica e Vibrações 18

  Vol. 11 No. 18 (1996)

  Summary content:

  • Applications of active control of sound and vibrations;
  • Ambient noise in Portugal;
  • Comments on the determination of the dynamic stiffness of materials for use in floating floors; and
  • Tips for noise control.
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  Acústica e Vibrações 17

  Vol. 11 No. 17 (1996)

  Summary content:

  • Progress in building acoustics;
  • The requirement of a minimum auditory rest of 10 minutes every 50 minutes of work, according to the technical norm of the State of São Paulo; and
  • The use of absorbent materials in industrial noise control: Possibilities and limitations;
  • Tips for noise control.
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  Acústica e Vibrações 16

  Vol. 10 No. 16 (1995)

  Summary content:

  • Answers to questions and complaints regarding hearing and hearing protectors;
  • The importance of acoustics and psychoacoustics for audiology: The influence of classroom acoustics on speech perception;
  • Tips for noise control; and
  • Machine noise control.
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  Acústica e Vibrações 15

  Vol. 10 No. 15 (1995)

  Summary content:

  • Industrial noise control;
  • Noise master plan in the multitasking industry;
  • Tips for noise control; and
  • News (books and conferences).
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  Acústica e Vibrações 14

  Vol. 9 No. 14 (1994)

  Editorial

  SOBRAC is on a path of improvement, after 10 years of its existence. Over the years, we have learned and modified the ways in which SOBRAC was organized, held congresses/symposia, and edited the magazine.

  In April 1994, the 15th SOBRAC Meeting was held together with the I Congress Brazil/Argentina, which was one of the biggest technological events in the area of ​​Acoustics and Vibrations in Latin America, with the publication of Annals of 600 pages, 6 ( six) key US speakers and Europe, with sections specialized in the area of ​​individual and collective protection against noise and vibrations, vehicle acoustics, urban noise, active noise control, acoustic materials and devices, with 88 works presented from Brazil, Argentina, Chile, and Mexico.

  One of SOBRAC's great achievements in 1994 was the work carried out together with other Latin American Societies such as: the Argentinian Acoustics Association (AdAA), Chilean Acoustic Society (in the reactivation phase), Peruvian Acoustic Society (SPA), and Instituto Mexicano de Acústica (see news on page 71).

  The request for copies of the magazine in Brazil and other Latin American countries led to the publication of the magazine in a new form. From this edition onwards, the journal will be in A4 size, with all articles in the same form, with high print quality, that is, the journal is at the same level as other international technical journals. We are composing an editorial group in 1995 in the various areas of acoustics and vibrations to contribute to the quality of the articles.

  Consumer demands on acoustic quality in the work and leisure environment significantly increased the demand for technology and information in this area, which stimulated SOBRAC to publish special editions, such as issue no. 13, July/94 on "Noise, Vibrations and Man", this issue on "Vehicle Acoustics", as well as the next issue of July 95, which we intend to address "Industrial Noise".

  In this context, the Sociedade Brasileira de Acústica, as a technical entity, dedicates this special edition to Vehicular Acoustics with the support of the Automobile Industry, Universities and Service and Material Providers.

  With CONAMA resolutions 06/93 and 07/93 and municipal and state decrees, in addition to the opening of the market for imported vehicles, national technological development in the area of ​​vehicular acoustics becomes inevitable to achieve competitive standards of external noise and internal comfort acoustic.

  We would like to thank the contribution of all authors and co-authors of this edition, especially Prof. Helcio Onusic for recommending the topic and for supporting the editing of this volume.

  Sarnir N.Y. Gerges, Sobrac President

  Summary content:

  • Active control of noise in pipelines;
  • Identification of vehicular noise sources by measuring sound intensity;
  • Transmission via area: internal noise and external noise;
  • Exhaust system: fundamentals and projects;
  • Tests and acoustic simulation of simple vehicle exhaust;
  • Numerical simulation of internal vehicle noise;
  • Reduction of the internal noise in intercity buses;
  • Internal noise of motor vehicles: the use of loudness;
  • Simulation and measurements of engine aspiration noise in the laboratory;
  • Experimental study of vibration and noise during clutch pedal actuation; and
  • Acoustic characterization of light metal engine test bench using sound intensity; and
  • News.
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  Acústica e Vibrações 13

  Vol. 9 No. 13 (1994)

  Summary content:

  • Analysis of postures, efforts and vibrations in sanders;
  • Suggestions on fitting hearing protectors;
  • Noise and its interference with health and work;
  • Hearing PPE: evaluation by TTS-part 1;
  • Hearing PPE: evaluation by TTS-part 2;
  • Audiometric classification criteria for workers with noise-induced hearing loss; and
  • The importance of audiometric monitoring in the hearing conservation program.
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  Acústica e Vibrações 12

  Vol. 8 No. 12 (1993)

  Summary content:

  • Effects of simultaneous exposure to noise and toluene on workers' hearing and balance;
  • Hearing infection with the use of the protector;
  • The effects of noise on hearing;
  • Acoustic absorption of finishing and construction materials; and
  • Voice system modeling for digital synthesis and its applications in music.
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  Acústica e Vibrações 11

  Vol. 7 No. 11 (1992)

  Summary content:

  • Motivating workers to use hearing protection devices;
  • Noise-induced hearing loss and current Brazilian legislation;
  • Design and construction of the anecoic chamber of the Laboratory of Acoustics and Lighting of the CIC – Rep. Argentina; and
  • Instrumentation of a spectrum analyzer with a PC; and
  • Papers presented at the IV SICOS and XII Meeting of SOBRAC-1992.
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  Acústica e Vibrações 10

  Vol. 7 No. 10 (1992)

  Summary content:

  • Differences in noise-induced hearing loss among workers in different activities in the same petrochemical industry;
  • Validation, diagnosis of industrial audiometry;
  • Effects of noise pollution on sleep and general health-urban emphasis;
  • Noise pollution in Belo Horizonte;
  • Computer acoustic simulation;
  • The power of sonic energy;
  • Acoustics and Architecture. A methodology for its integration; and
  • Evaluation of noise levels in agricultural tractors and their effects on the operator.
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  Acústica e Vibrações 09

  Vol. 6 No. 09 (1991)

  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”.
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  Acústica e Vibrações 08

  Vol. 5 No. 08 (1990)

  This issue has two articles, two inserts and abstracts presented at the XI Meeting of Sobrac, held in November 1990 in São Paulo/SP, and the IV Symposium on Dynamic Mechanical Problems (Diname), held in March 1991 in Pouso Alto/ MG

  The first article, entitled "Viscous Anti-vibration Pulleys for Diesel Engines, Fault Diagnosis", presents a method used by Mercedes Benz engineers in Brazil to diagnose faults in diesel engines. The second, entitled "Low Frequency Noise Absorption Using Cavity Bricks", evaluates and discusses the use of bricks with internal cavities acting as Helmholtz resonators for low frequency noise reduction.

  In the inserts section, Silvana Gonsalves presents the National Program for Education and Control of Sound Pollution, coordinated by Ibama (Brazilian Institute for the Environment and Renewable Natural Resources) and inspired by Resolutions 001 and 002 of Conama (National Council for the Environment). Finally, Professor Samir Gerges presents a mini-class on the effects of noise and vibrations on human beings.

  Summary content:

  • Viscous anti-vibration pulleys for diesel engines, fault diagnosis;
  • IBAMA launches the SILÊNCIO program;
  • Low frequency noise absorption using cavity bricks;
  • Mini class: Effects of noise and vibrations on man; and
  • Abstracts of the works of the XI Meeting of Sobrac, Nov/90.
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  Acústica e Vibrações 07

  Vol. 5 No. 07 (1990)

  This issue has an article, an insert and information about the X Meeting of Sobrac, held in December 1989 in Rio de Janeiro/RJ; XII World Congress on Occupational Health, held in May 1990 in Hamburg (Germany); and Internoise 89, held in December 1989 in Newport Beach (United States of America).

  The article written by Elvira Viveiros presents the implementation of a quick method for evaluating the acoustic intelligibility of rooms.

  Finally, the booklet has a mini-class on vibration isolation.

  Editorial

  Sobrac, despite the difficulties that the country is going through, has grown a lot, but it needs to grow much more, for its strengthening and development of acoustics and vibration science. During the 88/89 administration we managed to hold a meeting in Florianópolis-SC, at the end of 87, another in Campinas-SP, at the end of 88, as well as, together with the Rio de Janeiro Regional (Roberto Tenenbaum, Moyses Zindeluk, Jules S. Slama and Ricardo Musafir), the extraordinary III International Seminar on Noise Control, in December 1989 in Rio de Janeiro-RJ, also mentioning the replacement of the newsletter by Revista da Sobrac, published from 1988 onwards on a biannual basis . We also managed to consolidate our connection with the International Institute for Noise Control (I/INCE), in addition to continuing our efforts to hold an “InterNoise Conference” in Brazil, as we are competing in the queue for 93. We wish you a happy and fruitful management for the new Board of Directors for the 90/91 biennium, and we make our acquired experience available to those who will further enhance Sobrac with their greed, creativity and willingness to work.

  The Board
  Management 88/89

  Summary content:

  • Acoustic Intensity Technique, opening lecture at the X Meeting of Sobrac, Dec/89;
  • Program of the III International Seminar on Noise Control;
  • Mini class: Vibration isolation;
  • Measurement of the rapid intelligibility index of rooms; and
  • Papers presented at INTER-NOISE 89.
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  Acústica e Vibrações 06

  Vol. 4 No. 06 (1989)

  This issue presents the abstracts of the works presented at the "IX Sobrac Meeting", held in Campinas/SP in December 1988. It also has a mini-class entitled "Spare your auditory cells", extracted from an article by BILSOM (Sweden). Finally, in the news section, upcoming conferences and books published at the time are shared.

  Summary content:

  • Abstracts of papers presented at the IX Meeting of Sobrac, held in Campinas-SP, Dec/89.
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  Acústica e Vibrações 05

  Vol. 3 No. 05 (1988)

  We would like to report to our fellow Sobraquians some of the goals we managed to achieve in 1988.
  We were able to publish Bulletin 04, which grew to volume 5 — this magazine. This publication was prepared with material that was fully received by the members. Upon receipt of the Bulletin 04 evaluation form, 99% liked the "Mini-Class" and "Technological Innovation" and many asked us for copies of technical articles. In this edition we have achieved better print quality (more legible letters). We already have about 15 participants for our commercial catalog "Who is doing what in Acoustics and Vibrations", and we have extended the deadline for registration and participation until 12/15/88, giving a chance to companies that are still organizing material and also to others who still do not know this future publication. We are holding the IX MEETING OF SOBRAC on the 1st and 2nd of December, in Campinas-SP, thanking IBM, VIBRANIHIL and TRORION-Illbruck for their financial support, and also to our secretary José Maurício who worked up to 12 hours/ day. Our comrades Moysés and Roberto, from Rio de Janeiro, are organizing the great X MEETING OF SOBRAC Along with the III International Congress of Noise Control and X COBEM for December 1989. Last September, in Avignon-France, we participated in the meeting from the International Institute of Engineering Noise Control, marking the presence of Brazil with 5 representatives, where we renewed our request to hold the INTER-NOISE World Congress in Brazil for 1993.
  These are some of our achievements, in addition to the modification of the billing system and the complete administrative reorganization of SOBRAC. In the last eight months, SOBRAC grew 18% in number of members, but it is still completely dependent on physical space and telephone at UFSC and the PC computer at GVA (Grupo de Vibração e Acústica da UFSC). The financial situation is not comfortable. Our main expenses are the salary of our secretary José Maurício and postage costs.
  It can be noted that we are not talking about the future, nor making plans that are almost always on paper. We are repeating our "SOS" for all members to send us news, articles, mini-classes, technological innovations, jokes, etc.
  We leave the evaluations and recommendations for our General Assembly, in Campinas on 12/02/88.
  Until then.

  Summary content:

  • Fox vehicle acoustics;
  • Organization of a hearing conservation program;
  • Active silencers;
  • Mills: acoustic enclosure; and
  • Technical articles.
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  Acústica e Vibrações 04 (em falta)

  Vol. 3 No. 04 (1988)

  We do not have this complete edition yet, if you have it in your archive, please contact revista.aev@eac.ufsm.br.

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  Acústica e Vibrações 03 (em falta)

  Vol. 2 No. 03 (1986)

  We do not have this complete edition yet, if you have it in your archive, please contact revista.aev@eac.ufsm.br.

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  Acústica e Vibrações 02 (em falta)

  Vol. 1 No. 02 (1985)

  We do not have this complete edition yet, if you have it in your archive, please contact revista.aev@eac.ufsm.br.

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  Acústica e Vibrações 01

  Vol. 1 No. 01 (1985)

  Editorial

  The Brazilian Acoustic Society - SOBRAC is created. Acoustics in our sense, will be the science of sounds, noises, vibrations,... the enhancement of what is necessary for communication and pleasant to the senses,... the prevention and control of what is harmful to people,.. .of the diagnosis and treatment of these damages when consummated. It is a vast field in which those who produce knowledge on these subjects, those who transform it and those who apply it are dispersed. They are researchers and teachers. They are designers and consultants. They are manufacturers of materials and equipment. They are installers and instrumenters. It involves the most diverse activities from the planning, use and occupation of land around an airport to the study of molecular noise.

  In Brazil, for more than two decades, we have been working occasionally in this field, in the design of auditoriums, in the treatment of industrial noise, in the control of vibrations in machines and structures, in the characterization of the acoustic performance of materials, components and systems, in the development of electroacoustic equipment and musical instruments, in mapping and proposing measures to control urban noise, in the development of hearing protectors, in the clinical diagnosis and treatment of disorders of the auditory system, in the diagnosis and treatment of emotional and psychological imbalances produced by noise, etc. More recently, small, highly specialized teams have been set up, normally applied to specific industrial developments, such as noise and vibration treatment in vehicles and others. However, dispersion persists. Much work is done at the individual level or in these small teams, but little interaction occurs. Consequently, experiences are not exchanged, knowledge is not passed on, teaching is not expanded to the extent that is desirable,... , we do not add up, we do not structure ourselves in a larger, stronger organism with more possibilities, due to the vitality that flows between the parts. No, that hasn't happened..., at least until now! And if this situation persists, we will be attesting to our incomprehension, our immobility, our inability to give a little, even intuiting how much we could get back, in a context of communication and cooperation.

  The Brazilian Acoustic Society is constituted. What comes next is up to us! …

  Summary content:

  • Event: 5th Semiannual Meeting of Acoustics;
  • Article: Current Tinnitus Treatment (Marco Elizabetsky);
  • Article: Framework for Normalization in Acoustics (Peter Joseph Barry);
  • Conversation with the reader;
  • Humor section; and
  • News.