Investigation of the efficiency of various reactive mufflers by noise reduction and transmission loss analyses

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MOHAMMADI MAHYA; RAZAVI SEYED ESMAIL; AGHANAJAFI CYRUS; Khorand Hadi

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Journal Paper

Paper Information

Journal: JOURNAL OF THEORETICAL AND APPLIED VIBRATION AND ACOUSICS Year:2018 | Volume:4 | Issue:2 Page(s): 125-140

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Title

Investigation of the efficiency of various reactive mufflers by noise reduction and transmission loss analyses

Author(s)

MOHAMMADI MAHYA | RAZAVI SEYED ESMAIL | AGHANAJAFI CYRUS | Khorand Hadi | Issue Writer Certificate

Keywords

Transmission loss

Noise reduction

Reactive muffler

k-εmodel

Helmholtz equation

Abstract

Transmission loss and Noise reduction of Reactive mufflers are determined by linear acoustic theory and unsteady flow field study, respectively. The effects of extending the inlet tube of the muffler, adding holes to the extension, and the number of holes on both Transmission loss and Noise reduction are investigated. In Noise reduction analysis, the Navier-Stokes equations and k-ε model are used to study the unsteady turbulent flow. Helmholtz equation is solved for Transmission loss analysis. The present study is validated with experimental data. Numerical results show a rise in Noise reduction by extending the inlet tube of the muffler and increasing its length. Moreover, the extended mufflers cause more Transmission loss and broadband behavior at some frequencies due to the resonances. According to the results, different points of view in the investigation of acoustic attenuation performance of mufflers can be helpful to understand more and better about the effect of geometrical parameters.

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APA: Copy

MOHAMMADI, MAHYA, RAZAVI, SEYED ESMAIL, AGHANAJAFI, CYRUS, & Khorand, Hadi. (2018). Investigation of the efficiency of various reactive mufflers by noise reduction and transmission loss analyses. JOURNAL OF THEORETICAL AND APPLIED VIBRATION AND ACOUSICS, 4(2), 125-140. SID. https://sid.ir/paper/345782/en

Vancouver: Copy

MOHAMMADI MAHYA, RAZAVI SEYED ESMAIL, AGHANAJAFI CYRUS, Khorand Hadi. Investigation of the efficiency of various reactive mufflers by noise reduction and transmission loss analyses. JOURNAL OF THEORETICAL AND APPLIED VIBRATION AND ACOUSICS[Internet]. 2018;4(2):125-140. Available from: https://sid.ir/paper/345782/en

IEEE: Copy

MAHYA MOHAMMADI, SEYED ESMAIL RAZAVI, CYRUS AGHANAJAFI, and Hadi Khorand, “Investigation of the efficiency of various reactive mufflers by noise reduction and transmission loss analyses,” JOURNAL OF THEORETICAL AND APPLIED VIBRATION AND ACOUSICS, vol. 4, no. 2, pp. 125–140, 2018, [Online]. Available: https://sid.ir/paper/345782/en

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