Correlation between the shape of substitution ducts and insertion loss of silencers

• Autorzy: Wójciak Kamil , Kopania Joanna Maria

Identyfikatory

DOI

10.21008/j.0860-6897.2022.2.12

• Języki publikacji: EN

Abstrakty

EN

Silencers are typical devices used for the reduction of noise in ventilation systems, which can be found in almost all industrial, service or residential installations. Determination of acoustic parameters for specific HVAC devices, like silencers, is within the scope of specialised laboratories. With the silencers, two main parameters should be taken care of: the first one is sound attenuation and the second one is pressure losses. In the presented paper, the focus is on measurement methods described by standard ISO 7235:2009. This standard specifies the methods for determining the sound power level of the flow noise generated by silencers, the total pressure of silencers and the insertion loss of silencers with and without airflow by using the substitute object. In this work, we focused on the correlation between the shape of the substitution duct and its acoustic parameters and its relation to this with the final result of insertion loss of a silencer.

Słowa kluczowe

EN

silencer; insertion loss; aeroacoustics

PL

tłumik; strata wtrąceniowa; aeroakustyka

• Wydawca: Poznan University of Technology. Institute of Applied Mechanics
• Czasopismo: Vibrations in Physical Systems
• Rocznik: 2022
• Tom: Vol. 33, nr 2
• Strony: art. no. 2022212
• Opis fizyczny: Bibliogr. 11 poz., rys. kolor., wykr.

Twórcy

autor

Wójciak Kamil

• Institute of Power Engineering, Mory 8, 01-330 Warsaw, Poland

• https://orcid.org/0000-0002-3672-1788

autor

Kopania Joanna Maria

• Lodz University of Technology, Żeromskiego 116, 90-924 Lodz, Poland

• https://orcid.org/0000-0001-9162-6479

Bibliografia

• 1. WHO, Environmental noise guidelines for the European Region, 2018
• 2. U. Kurze, E. Riedel; Silencer; In: Handbook of Engineering Acoustics; G. Muller and M. Moser (eds.); Springer-Verlag Berlin Heidelberg 2013, 269-298. DOI 10.1007/978-3-540-69460-1_11
• 3. A. Bhatia; HVAC Systems Noise Control; Continuing Education and Development Inc 109, 2014.
• 4. PN-EN ISO 7235:2009 Acoustics - Laboratory measurement procedures for ducted silencers and air-terminal units - Insertion loss, flow noise and total pressure loss.
• 5. ISO 11691:2020 Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory survey method.
• 6. ISO 5135:2020 Acoustics - Determination of sound power levels of noise from air-terminal devices, air-terminal units, dampers and valves by measurement in a reverberation test room.
• 7. ASTM-E477 Standard Test Method for Laboratory Measurements of Acoustical and Airflow Performance of Duct Liner Materials and Prefabricated Silencers.
• 8. ASHRAE Handbook - HVAC Systems and Equipment, 2020.
• 9. R. Kirby; Validating insertion loss predictions for HVAC silencers; The Sixteenth International Congress on Sound and Vibration, Kraków, 5-9 July, 2009.
• 10. PN-ISO 5221:1994 Air distribution and air diffusion - Rules to methods of measuring air flow rate in an air handling duct
• 11. PN-EN ISO 3741:2011 Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for reverberation test rooms.

Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).