Effect of Diffusing Elements in a Reverberation Room on the Results of Airborne Sound Insulation Laboratory Measurements

• Autorzy: Mleczko Dominik , Wszołek Tadeusz

Identyfikatory

DOI

10.24425/aoa.2019.129729

• Języki publikacji: EN

Abstrakty

EN

The main problem in the measurement of airborne sound insulation is the measurement of the sound power radiated by the barrier, in practice performed by measuring the sound pressure level and the acoustic absorption in the receiving room. Large variations of the sound pressure level in a reverberation room indicate the presence of dominating strong standing waves, so that it becomes necessary to install diffusing elements. In ISO 10140, the limits have been defined in which the reverberation time at frequencies at and above 100 Hz should be included. Sometimes, however, in the case of rooms with a large volume, obtaining the required parameters is difficult and sometimes even impossible. It should then be checked whether the measured sound insulation depends on the reverberation time. The paper presents the results of sound insulation measurements at various reverberation time lengths in subsequent stages of diffusing elements installation in the receiving room. An analysis of diffusing materials amount and arrangement influence on the uniformity of the sound pressure level distribution and reverberation time in the room as well as the value of the measured sound insulation was carried out. Uncertainty of sound insulation measurement with partial uncertainties was adopted as a criterion supporting the assessment of the obtained results.

Słowa kluczowe

EN

reverberation room; airborne sound insulation; diffuseness

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2019
• Tom: Vol. 44, No. 4
• Strony: 739--746
• Opis fizyczny: Bibliogr. 11 poz., fot., rys., tab., wykr.

Twórcy

autor

Mleczko Dominik

• AGH University of Science and Technology, Faculty of Mechanical Engineering and Robotics, Department of Mechanics and Vibroacoustics, Al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Wszołek Tadeusz

• AGH University of Science and Technology, Faculty of Mechanical Engineering and Robotics, Department of Mechanics and Vibroacoustics, Al. Mickiewicza 30, 30-059 Kraków, Poland

Bibliografia

• 1. ASTM C423-17 (2017), Standard test method for sound absorption and sound absorption coefficients by the reverberation room method, ASTM International, West Conshohocken, PA. doi: 10.1520/C0423-17.
• 2. ASTM E90-09 (2016), Standard test method for laboratory measurement of airborne sound transmission loss of building partitions and elements, ASTM International, West Conshohocken, PA, doi: 10.1520/E0090-09R16.
• 3. Batko W., Pawlik P. (2013), New method of uncertainty evaluation of the sound insulation of partitions, Acta Physica Polonica A, 123, 6, 1012-1015, doi: 10.12693/APhysPolA.123.1012.
• 4. Bradley D., Müuller-Trapet M., Adelgren J., Vorländer M. (2014), Effect of boundary diffusers in a reverberation chamber: Standardized diffuse field quantifiers, The Journal of the Acoustical Society of America, 135, 1898-1906, doi: 10.1121/1.4866291.
• 5. ISO/IEC Guide 98-3:2008 (JCGM/WG1/100) (2008), Uncertainty of measurement – Part 3: Guide to the expression of uncertainty in measurement (GUM:1995).
• 6. Mleczko D., Wszołek T. (2010), Variability influence of input parameters on result of room acoustic calculation, Acta Physica Polonica A, 118, 1, 128-130.
• 7. PN-EN ISO 10140-2 (2011), Acoustics. Laboratory measurement of acoustic insulation of building elements. Part 2: Measurement of airborne sound insulation.
• 8. PN-EN ISO 10140-5 (2010), Acoustics – Laboratory measurement of sound insulation of building elements – Part 5: Requirements for test facilities and equipment.
• 9. PN-EN ISO 354 (2005), Acoustics – Measurement of sound absorption in a reverberation room.
• 10. Toyoda E., Sakamoto S., Tachibana H. (2004), Effects of room shape and diffusing treatment on the measurement of sound absorption coefficient in a reverberation room, Acoustical Science and Technology, 25, 4, 255-266, doi: 10.1250/ast.25.255.
• 11. Wszołek T. (2007), Uncertainty of sound insulation measurement in laboratory, Archives of Acoustics, 32, 4 (Supplement), 271-277.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).