Sound-Absorbing and Insulating Enclosures for Ultrasonic Range

• Autorzy: Dobrucki A. , Żółtogórski B. , Pruchnicki P. , Bolejko R.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

ultrasonic noise; sound absorbing and insulating enclosure; welder

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2010
• Tom: Vol. 35, No. 2
• Strony: 157--164
• Opis fizyczny: Bibliogr. 6 poz., fot., tab., wykr.

Twórcy

autor

Dobrucki A.

autor

Żółtogórski B.

autor

Pruchnicki P.

autor

Bolejko R.

• Wrocław University of Technology Institute of Telecommunications, Teleinformatics and Acoustics Wybrzeze Wyspianskiego 27, 50-370 Wrocław, Poland,

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.