Design of the test facility for the measurement of noise silencers

• Autorzy: Bolejko Romuald , Plaskota Przemysław , Dobrucki Andrzej B. , Pruc Krzysztof

Identyfikatory

DOI

10.21008/j.0860-6897.2022.3.09

• Języki publikacji: EN

Abstrakty

EN

In the paper, a description of the test facility designed and implemented for noise silencers according to the methodology specified in the PN-EN ISO 7235 standard is presented. It is possible to measure the insertion loss, flow noise, and pressure loss on the test stand. In particular, the following issues were presented: noise protection in the low frequency range, the design of the anechoic termination, and measurements of the sound pressure level in the flow. To obtain a sufficiently high level of noise protection, three noise transmission paths were considered: direct, indirect, and flanking. The design of the anechoic termination was based on the profile of the catenoid tube, which made it possible to obtain strong sound absorption in the low-frequency range while maintaining a limited length of a terminator. A specially designed microphone cap was used to measure the sound pressure level in the flow field. The paper also presents results of selected measurements that illustrate the possibilities of the designed test stand.

Słowa kluczowe

EN

baffle silencers; insertion loss; flow noise

PL

tłumik przegrodowy; strata wtrąceniowa; hałas przepływu

• Wydawca: Poznan University of Technology. Institute of Applied Mechanics
• Czasopismo: Vibrations in Physical Systems
• Rocznik: 2022
• Tom: Vol. 33, nr 3
• Strony: art. no. 2022309
• Opis fizyczny: Bibliogr. 4 poz., 1 fot. kolor., rys., wykr.

Twórcy

autor

Bolejko Romuald

• Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland

• https://orcid.org/0000-0001-7824-1312

autor

Plaskota Przemysław

• Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland

• https://orcid.org/0000-0002-6930-7356

autor

Dobrucki Andrzej B.

• Wroclaw University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland

• https://orcid.org/0000-0002-2588-547X

autor

Pruc Krzysztof

• BH-Res Mędrek i wspólnicy Sp. J., Torowa 3, 35-205 Rzeszów, Poland

Bibliografia

• 1. European Standard EN ISO 7235:2009 Acoustics - Laboratory measurement procedures for ducted silencers and air-terminal units - Insertion loss, flow noise and total pressure loss.
• 2. European Standard EN ISO 5136:2009 Acoustics - Determination of sound power radiated into a duct by fans and other air-moving devices - In-duct method.
• 3. A.B. Dobrucki, P. Plaskota, R. Bolejko; Acoustic anechoic termination of the waveguide in the measuring system of ducted silencers; Proceedings of the 19th International Conference on Noise Control 2022; Lidzbark Warmiński, Poland, 2022.
• 4. European Standard EN ISO 10534-2:1998 Acoustics - Determination of sound absorption coefficient and impedance in impedance tubes - Part 2: Transfer-function method.

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).