Transmission loss and pressure drop of selected range of helicoidal resonators

• Autorzy: Łapka W.
• Konferencja: Symposium “Vibrations In Physical Systems” (26 ; 04-08.05.2014 ; Będlewo koło Poznania ; Polska)
• Języki publikacji: EN

Abstrakty

EN

The paper presents the numerical analysis of transmission loss and pressure drop of acoustic helicoidal resonators with constant pitch to cylindrical duct diameter ratio and different number of helicoidal turns n. The ducted system consists of a straight cylindrical duct of constant diameter d=0.125m. The ratio of helicoidal pitch s to cylindrical duct diameter d equals s/d=1,976. Other geometrical relationships of helicoidal resonator, as a mandrel diameter dm to duct diameter ratio dm/d=0.024 and thickness g of helicoidal profile g/d=0.0024, were constant as well. The investigated range of numbers of helicoidal turns n was analyzed in the range from 0 to 2.0 for transmission loss parameter and from 0 to 1.0 for pressure drop. The values of normal inflow velocity v [m/s] equals 1, 5, 10, 15 and 20.

Słowa kluczowe

EN

helicoidal resonator; transmission loss; pressure drop; numerical analysis

PL

rezonator helikoidalny; straty transmisyjne; spadek ciśnienia; analiza numeryczna

• Wydawca: Poznan University of Technology. Institute of Applied Mechanics
• Czasopismo: Vibrations in Physical Systems
• Rocznik: 2014
• Tom: Vol. 26
• Strony: 121--128
• Opis fizyczny: Bibliogr. 18 poz., rys., wykr.

Twórcy

autor

Łapka W.

• Poznan University of Technology, Institute of Applied Mechanics, Jan Paweł II 24 Street, 61-139 Poznań, Poland

Bibliografia

• 1. Łapka W., Cempel C., Acoustic filter for sound attenuation 1. in ducted systems, Polish Patent Office, PAT.216176, Date of grant 25.07.2013.
• 2. Łapka W., Cempel C., Noise reduction of spiral ducts, International Journal of Occupational Safety and Ergonomics (JOSE), Vol. 13 (4), pp. 419-426, 2007.
• 3. W. Łapka, Acoustic attenuation performance of a round silencer with the spiral duct at the inlet, Archives of Acoustics, Vol. 32 (4) (Supplement), pp. 247-252, 2007.
• 4. Łapka W., Cempel C., Computational and experimental investigations of a sound pressure level distribution at the outlet of the spiral duct, Archives of Acoustics, Vol. 33 (4) (Supplement), pp. 65-70, 2008.
• 5. Łapka W., Cempel C., Acoustic attenuation performance of Helmholtz resonator and spiral duct, Vibrations in Physical Systems, Vol. 23, pp. 247-252, 2008.
• 6. Łapka W., Insertion loss of spiral ducts - measurements and computations, Archives of Acoustics, Vol. 34 (4), pp. 407-415, 2009.
• 7. Łapka W., Substitutional transmittance function of helicoidal resonator, Vibrations in Physical Systems, Vol. 24, pp. 265-270, 2010.
• 8. Łapka W., Comparison of numerically calculated pressure drop for selected helicoidal resonators, Polskie Towarzystwo Akustyczne - Oddział Poznański, tytuł monografii: 59th Open Seminar on Acoustics joint with Workshop on Strategic Management of Noise including Aircraft Noise, pp. 145-148, 2012.
• 9. Łapka W., Numerical Aeroacoustic Research of Transmission Loss Characteristics Change of Selected Helicoidal Resonators due to Different Air Flow Velocities, Vibrations in Physical Systems, Vol. 25, pp. 267-272, 2012.
• 10. Łapka W., Multi resonant helicoidal resonator for passive noise control in ducted systems, Experimental Mechanics - New Trends and Perspectives, Editors J.F. Silva Gomes, Mario A.P. Vaz, Proceedings of the 15th International Conference on Experimental Mechanics, ICEM15, Porto, Portugalia, 22-27 lipiec 2012, 995-996, 2012.
• 11. Łapka W., Helicoidal resonators for passive noise control in ducted systems with practical application, Proceedings of Internoise 2012, New York, USA, 2012.
• 12. Łapka W., Numerical study of acoustic-structure interaction of selected helicoidal resonator with flexible helicoidal profile, rozdział w j. ang. w monografii pt. Postępy Akustyki, Polskie Towarzystwo Akustyczne - Oddział w Rzeszowie, Rzeszów, pp. 194-205, 2013.
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