Applications of the Multilayer Porous Medium Modeling Approach for Noise Mitigation

Teruna, Christopher; Rego, Leandro F.; Avallone, Francesco; Ragni, Daniele; Casalino, Damiano

doi:10.1061/(asce)as.1943-5525.0001326

Cited by 9 publications

(2 citation statements)

References 51 publications

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“…Porous materials play a crucial role in understanding and characterizing the acoustical behavior of various applications, such as noise reduction in the automotive industry, aircraft, and buildings [1][2]. Static airflow resistivity, commonly referred to as resistivity (σ), is a fundamental parameter used to describe the acoustic performance of these materials [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Noise Control System Design with Precise Flow Resistivity Estimation in Multilayer Porous Materials

Sadouki

2023

Preprint

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This paper presents a computational technique for estimating the equivalent flow resistivity in multilayer rigid porous materials, specifically for use in acoustic insulation systems. Existing models can predict sound transmission through individual layers, but lack a direct analytical link between the flow resistivity of multilayer materials and the properties of individual layers. To remedy this, the study makes use of equivalent fluid theory, which takes into account visco-inertial interactions between the material structure and the interstitial fluid. By establishing simplified expressions for the transmission coefficient of a bilayer medium under low-frequency Darcy conditions, the paper proposes a unique estimation approach. In addition, it derives a succinct law relating the resistivity of the bilayer medium to the resistivity and thickness of each layer, which extends to multilayer configurations. Experimental validation with bilayer samples demonstrates substantial agreement between the equivalent flux resistivity obtained directly and the theoretically predicted values, with relative errors ranging from 3–18%. The importance of the paper lies in its practical impact on acoustic insulation systems, for which accurate predictions of acoustic performance are crucial. The research proposes an efficient and reliable method for estimating equivalent flow resistivity, offering an alternative to labor-intensive experimental techniques and software. This contributes to acoustics by enabling accurate prediction and characterization of the acoustic properties of multilayer porous materials, facilitating the design of effective noise control systems.

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Section: Introductionmentioning

confidence: 99%

Enhancing Noise Control System Design with Precise Flow Resistivity Estimation in Multilayer Porous Materials

Sadouki

2023

Preprint

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“…Porous materials such as polyurethane (PU) fibers and foams are often used to reduce noise pollution in buildings, hospitals, and the automotive and aerospace industries [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Static airflow resistivity association law of a multilayer rigid porous material

Sadouki

2022

Preprint

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Mono and multi-layer porous media are very often used in building engineering and aerospace industry to fight against noise pollution. These media are characterized by several acoustic parameters, the most important of which is the flow resistivity. In this article, a static airflow resistivity association law of multilayer rigid porous materials is proposed. The equivalent fluid theory is considered. The visco-inertial interactions between the structure and the pore-saturating fluid are taken into account by the dynamic tortuosity introduced by Johnson et al and the dynamic compressibility given by Allard. Simplified expressions of acoustic transmission coefficients of a monolayer and bilayer porous medium are established in the very low-frequency regime. The established expressions are independent of frequency and depend only on the airflow resistivity and the thickness of each layer. The equivalent flow resistivity of the bilayer medium is expressed as a function of the thickness and flow resistivity of each layer. The established law has been generalized to the case of a multilayer medium consisting of several different rigid porous layers. Experimental validation of the established law is carried out using a combination of several samples of polyurethane foams (PU) with different thicknesses and flow resistivity.

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Unveiling the physics of acoustic insulation: multilayer flow resistivity estimation

Sadouki

2024

Indian J Phys

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Applications of the Multilayer Porous Medium Modeling Approach for Noise Mitigation

Cited by 9 publications

References 51 publications

Enhancing Noise Control System Design with Precise Flow Resistivity Estimation in Multilayer Porous Materials

Enhancing Noise Control System Design with Precise Flow Resistivity Estimation in Multilayer Porous Materials

Static airflow resistivity association law of a multilayer rigid porous material

Unveiling the physics of acoustic insulation: multilayer flow resistivity estimation

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