Numerical aeroacoustic research of transmission loss characteristics change of selected helicoidal resonators due to different air flow velocities

• Autorzy: Łapka W.
• Konferencja: Jubilee Symposium Vibrations In Physical Systems (25 ; 15-19.05.2012 ; Będlewo koło Poznania ; Polska)
• Języki publikacji: EN

Abstrakty

EN

This paper presents the results of aeroacoustic numerical simulations for three types of helicoidal resonators placed inside straight cylindrical duct. The same ratio s/d = 1.976 is considered for three numbers of helicoidal turns n = 0.671, n = 0.695 and n = 1.0. Also three types of transmission loss characteristics are represented. Three-dimensional models were calculated by the use of a finite element method in Comsol Multiphysics Acoustics Module – Aeroacoustics with flow, Frequency Domain. The change of transmission loss characteristics of helicoidal resonators is presented for different air flow velocities in the range from 1 m/s to 20 m/s for cylindrical duct of diameter d = 0.125m.

Słowa kluczowe

EN

helicoidal resonator; sound attenuation; aeroacoustics

PL

rezonator helikoidalny; tłumienie dźwięku; aeroakustyka

• Wydawca: Poznan University of Technology. Institute of Applied Mechanics
• Czasopismo: Vibrations in Physical Systems
• Rocznik: 2012
• Tom: Vol. 25
• Strony: 267--272
• Opis fizyczny: Bibliogr. 8 poz., il. kolor., wykr.

Twórcy

autor

Łapka W.

• Poznań University of Technology, Institute of Applied Mechanics, Jan Paweł II 24, 60-965 Poznań, Poland

Bibliografia

• 1. COMSOL Multiphysics version 4.2.a, Acoustic Module, User’s Guide and Model Library Documentation Set, COMSOL AB, www.comsol.com, Stockholm, Sweden, (2011).
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• 3. Łapka W, Acoustic attenuation performance of a round silencer with the spiral duct at the inlet, Archives of Acoustics, 32 (2007) 247-252.
• 4. Łapka W., Acoustical properties of helicoid as an element of silencers, Doctoral work, Faculty of Mechanical Engineering and Management, Poznań University of Technology (2009).
• 5. Łapka W., Helicoidal resonator, Proceedings of 39th International Congress and Exposition on Noise Control Engineering INTER-NOISE 2010, 9 pages in CDROM, Lisbon, Portugal, (2010) 9 pages in CD-ROM
• 6. Łapka W., Cempel C., Acoustic short helicoidal resonator-computational and experimental investigations, Proceedings of 58th Open Seminar on Acoustics, OSA 2011, Gdańsk-Jurata, Poland, (2011) 9-16.
• 7. Munjal M. L., Acoustics of Ducts and Mufflers with Application to Exhaust and Ventilation System Design, Inc., Calgary, Canada, John Wiley & Sons, (1987) 328.
• 8. Ver I. L., Beranek L. L., Noise and vibration control engineering, 2nd edition, Hoboken, John Wiley & Sons, Inc., New Jersey, USA, (2006) 966.