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Warianty tytułu
Języki publikacji
Abstrakty
The article presents the results of research on the acoustic properties of materials used as sound-absorbing linings and cores in baffles of anti-noise protection. Using an impedance tube the spectral characteristics of the normal incidence sound absorption and sound transmission loss indices of 12 specimens of mineral wool with different density and thickness were determined. From these characteristics, the single-number weighted sound absorption coefficient αw and the sound reduction index Rw were calculated. To calculate the value of the Rw index on the basis of surface mass of the mineral wool specimen, a new formula was proposed. The insertion loss of an acoustic enclosure with one, two and three-layer walls with dimensions of 0.7×0.7 m, containing mineral wool, was determined. The best efficiency was achieved for the enclosure made of walls of layers: mineral wool, placed on the sound source side, steel plate and aluminium plate.
Czasopismo
Rocznik
Tom
Strony
art. no. 2021107
Opis fizyczny
Bibliogr. 10 poz., fot. kolor., wykr.
Twórcy
autor
- AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków
Bibliografia
- 1. I.L. Ver, L.L. Beranek. Noise and vibration control engineering - principles and applications. John Wiley & Sons Inc, Hoboken, New Jersey, 2006.
- 2. J. Sikora. Layered baffles in solutions restricting the noise level of machinery and tools [in Polish]. Bezpieczeństwo Pracy - Nauka i Praktyka, 8:26-31, 2012.
- 3. J. Nurzyński. Sound insulation of bulkhead panels. Applied Acoustics, 179:108061,2021. DOI: 10.1016/j.apacoust.2021.108061
- 4. K. Kosała. Calculation models for analysing the sound insulating properties of homogeneous single baffles used in vibroacoustic protection. Applied Acoustics, 146:108-117, 2019. DOI: 10.1016/j.apacoust.2018.11.012
- 5. J. Turkiewicz, J. Sikora. Investigations of the sound absorption coefficient of composite materials [in Polish]. Technical Transactions. Mechanics, 5-M(15):113-122,2011.
- 6. E2611-19 Normal Incidence Determination of Porous Material Acoustical Properties Based on the Transfer Matrix Method. ASTM International: West Conshohocken, PA, 2019.
- 7. ISO 11534-2. Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes-Part 2 Transfer-function method. International Organization for Standardization (ISO): Geneva, Switzerland, 2001.
- 8. PN-EN ISO 3746:2011 - Akustyka. Wyznaczanie poziomów mocy akustycznej źródeł hałasu na podstawie pomiarów poziomu ciśnienia akustycznego. Metoda orientacyjna z zastosowaniem otaczającej powierzchni nad płaszczyzną odbijającą dźwięk.
- 9. K. Kosała, L. Majkut, R. Olszewski. Experimental study and prediction of insertion loss of acoustical enclosures. Vibrations in Physical Systems, 31(2):2020209, 2020. DOI: 10.21008/j.0860- 6897.2020.2.09
- 10. K. Kosała, L. Majkut, R. Olszewski, A. Flach. Laboratory test of the prototype stand to determine the acoustic properties of materials used in noise protection [in Polish]. Technologie XXI wieku - aktualne problem i nowe wyzwania T.1:7-20, 2020.
Uwagi
Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-5ee3f838-9a10-4c9b-ae6a-e130d1841ac2