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Abstrakty
The physical phenomena occurring in sound-absorbing and insulating enclosures are subject of the present paper. These phenomena are: absorption in air and by the sound-absorbing material covering the walls and the coincidence effect. The absorption in the air can be neglected in small size enclosures for low ultrasonic frequencies (20–30 kHz). The coincidence plays a role in decrease of the sound insulation, however the main role play the leaks. The boards made of ceramic fibers have been chosen as the optimal sound-absorbing material. They are dense and have deeply porous structures. The enclosure for insulation of 20-kHz noise produced by a welding machine has been designed and manufactured, and reductions of 25 dB of peak and Leq levels have been achieved.
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Czasopismo
Rocznik
Tom
Strony
157--164
Opis fizyczny
Bibliogr. 6 poz., fot., tab., wykr.
Twórcy
autor
autor
autor
autor
- Wrocław University of Technology Institute of Telecommunications, Teleinformatics and Acoustics Wybrzeze Wyspianskiego 27, 50-370 Wrocław, Poland, andrzej.dobrucki@pwr.wroc.pl
Bibliografia
- 1. ISO 9613-1:1993, Acoustics - Attenuation of sound during propagation outdoors.
- 2. ISO 354:2003, Acoustics - Measurement of sound absorption in a reverberation room
- 3. Knudsen V.O. (1932), Architectural Acoustics, New York.
- 4. MLSP Regulation of January 2, 2001 on the maximum permissible concentration and intensity of harmful factors in the work environment, Official Gazette, 4, 36, 2001.
- 5. Sadowski J. (1976), Architectural Acoustics [in Polish], PWN Warszawa-Poznań.
- 6. Smagowska B., Mikulski W. (2008), Noise at ultrasonic drill systems - evaluation of health risk [in Polish], Bezpieczeństwo Pracy (Work Safeness), 10, 18-22.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BUS8-0019-0050