Investigation on the Effects of Acoustic Liner Variation and Geometry Discontinuities on the Acoustic Performance of Lined Ducts

• Autorzy: Dhief Raja , Makni Amine , Taktak Mohamed , Chaabane Mabrouk , Haddar Mohamed

Identyfikatory

DOI

10.24425/aoa.2020.132481

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

absorbent systems effect; discontinuities effect; scattering matrix; acoustic power attenuation

• Wydawca: Instytut Podstawowych Problemów Techniki PAN ; Komitet Akustyki PAN ; Polskie Towarzystwo Akustyczne
• Czasopismo: Archives of Acoustics
• Rocznik: 2020
• Tom: Vol. 45, No. 1
• Strony: 49--66
• Opis fizyczny: Bibliogr. 35 poz., rys., tab., wykr.

Twórcy

autor

Dhief Raja

• Faculty of Sciences of Sfax, BP 1171, 3000 Sfax, Tunisia
• Laboratory of Mechanics, Modeling and Production (LA2MP), National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia

autor

Makni Amine

• Laboratory of Mechanics, Modeling and Production (LA2MP), National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia

autor

Taktak Mohamed

• Faculty of Sciences of Sfax, BP 1171, 3000 Sfax, Tunisia
• Laboratory of Mechanics, Modeling and Production (LA2MP), National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia

autor

Chaabane Mabrouk

• Faculty of Sciences of Sfax, BP 1171, 3000 Sfax, Tunisia

autor

Haddar Mohamed

• Laboratory of Mechanics, Modeling and Production (LA2MP), National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).