Sound Transmission in a Duct with Sudden Area Expansion, Extended Inlet, and Lined Walls in Overlapping Region

Demír, Ahmet

doi:10.1155/2016/9485163

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…He showed that the sudden discontinuity in a cylindrical duct is analogous to lumped impedance. The transmission of sound in the case where the walls of the duct with sudden area expansion and extended inlet, treated by acoustically absorbing materials of finite length, is investigated by Demir (2016). In another work Demir (2017) defined the scattering matrices with the help of the Wiener-Hop technique in a non-uniformly lined duct with an inserted expansion chamber.…”

Section: Introductionmentioning

confidence: 99%

Archives of Acoustics

Dhief

Makni

Taktak

et al. 2020

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Noise reduction inside waveguide systems has gained momentum owing to a great interest in it. To attenuate the sound in a broad frequency range, this study aims to compare the effects of two acoustic liners, a perforated plate backed by an air cavity (PP-Air cavity), or by a porous material (PP-PM), on the acoustic behaviour of lined ducts using a numerical model to compute the multimodal scattering matrix. From this matrix, the reflection and the transmission coefficients are computed and therefore the acoustic power attenuation is deduced. Moreover, the effects of geometry of ducts with and without changes in the section are investigated. The numerical results are obtained for five configurations, including cases of narrowing and widening of a duct portion with sudden or progressive discontinuities. Accordingly, numerical coefficients of reflection and transmission as well as the acoustic power attenuation show the relative influence of acoustic liners in each type of configuration.

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Section: Introductionmentioning

confidence: 99%

Archives of Acoustics

Dhief

Makni

Taktak

et al. 2020

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Archives of Acoustics

Tiryakioglu

Demír

2020

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Scattering of sound waves in two stepped cylindrical duct which walls are coated with different acoustically absorbent materials is investigated by using Wiener-Hopf technique directly and by determining scattering matrices. First, by using Fourier transform technique we obtain a couple of modified Wiener-Hopf equations whose solutions involve four sets of infinitely many unknown expansion coefficients providing systems of linear algebraic equations. Then we determine scattering matrices of the problem and we state the total transmitted field by using generalized scattering matrix method. Numerical results are compared for different parameters.

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Sound Transmission in a Duct with Sudden Area Expansion, Extended Inlet, and Lined Walls in Overlapping Region

Cited by 2 publications

References 12 publications

Archives of Acoustics

Archives of Acoustics

Archives of Acoustics

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