Poroelastic lamellar metamaterial for sound attenuation in a rectangular duct

Li, Ké; Nennig, Benoît; Perrey‐Debain, Emmanuel; Dauchez, Nicolas

doi:10.1016/j.apacoust.2020.107862

Cited by 12 publications

(7 citation statements)

References 42 publications

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“…()1) giving 543 Hz. Results obtained in our experimental test bench [8] are close to simulations obtained by finite element model (see [6] for more details). The model allows to analyze the dissipation mechanisms and optimize the poroelastic metamaterial according to its properties such as airgap, airflow resistivity, Young's modulus and loss factor.…”

Section: Sound Attenuation In Waveguides By Poroelastic Lamellaesupporting

confidence: 82%

“…The aim of this paper is to show how one can take advantage of the skeleton resonances of a poroelastic material [5,6] to create a "poroelastic metamaterial" and obtain a better noise control. The design allows easy adjustment of the targeted frequency without increasing the mass density or space.…”

Section: Introductionmentioning

confidence: 99%

“…Two configurations are addressed (Fig. 1): first, we consider the acoustic attenuation in a duct with a structured liner [6], and secondly, the sound insulation weaknesses of a single or double wall partition [7].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the use of structured poroelastic materials for noise control at low frequency

Dauchez,

Li,

Nennig

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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Porous materials are widely used for noise control due to their light weight and excellent sound absorption, except in the low frequency range. This paper presents two configurations where a poroelastic material is structured to address this limitation by taking advantage of a skeleton resonance at low frequency. The design allows easy adjustment of the targeted frequency without increasing the mass density or sacrificing space. First, the acoustic propagation in a duct is considered. It is controlled by an array of poroelastic lamellae, which provides an increased sound attenuation around the first bending resonance of the lamellae. Secondly, the weaknesses of sound transmission through a single or double panel partition are addressed. They are mitigated by a network of poroelastic clamped beams, the first bending resonance of which is adjusted to the first mode of the finite size plate or to the mass-spring-mass resonance of the double panel. For both configurations, experimental proofs of the concept are shown. Finally, a numerical model, which can take into account the periodicity of the structure, makes it possible to analyze the dissipation mechanisms and the effect of the governing parameters, such as the mass ratio, the Young's modulus and the airflow resistivity.

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Section: Sound Attenuation In Waveguides By Poroelastic Lamellaesupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

On the use of structured poroelastic materials for noise control at low frequency

Dauchez,

Li,

Nennig

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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“…Liu et al [12] investigated noise reduction and acoustic impedance of a duct intake using a modified time domain model instead of the classical transmission loss model. Porous lamellas placed in a rectangular duct of an attenuator were evaluated numerically and experimentally by Li et al [13], showing that acoustic attenuation is primarily due to viscous and structural dissipation.…”

Section: Introductionmentioning

confidence: 99%

Evaluating of Noise Reduction Techniques for Turboengine Test Stands: A Preliminary Analysis

Cristea,

Deaconu

2024

Preprint

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Emphasizing the importance of acoustic attenuation in maintaining compliance with stringent noise regulations and enhancing workplace safety, the analysis covers the theoretical and practical aspects of sound attenuation in a turboengine testing stand. This paper presents a preliminary analysis and also an evaluation of a procedure for projecting a noise attenuator for industrial application and especially for turboengine test stands. While primarily focusing on the static acoustic behavior of the attenuator, considerations were also made regarding flow dynamics, Mach number-dependent attenuation, pressure drop, and self-generated noise aspects to provide a comprehensive perspective in selecting the optimal design configuration. The study investigates different calculation methods for assessment of the noise reduction for linear and staggered baffles, applied on a scaled reduced model of attenuator. Thus, the critical parameters and projecting requirements necessary for effective noise reduction in high-performance turboengine testing environments will be evaluated in a down-scaled model. Key factors examined include the selection of design parameters and configurations from various options. Advanced computational methods, like analytic and finite element analysis (FEM) are utilized to predict the acoustic performance and identify potential design optimizations. Experimental validation is performed to corroborate the simulation results, ensuring the reliability and efficiency of the attenuator. The findings indicate that a well-designed sound attenuator module can significantly reduce noise levels without compromising the operational performance of the turboengine inside a test cell.

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“…The sound attenuation of a silencer consisting of a lamella network made with melamine foam inserted in rectangular duct was investigated numerically and experimentally in ref. [4]. The equations of motion of an air saturated rectangular porous plate under the terms of the model based on a mixed displacement-pressure formulation of the Biot-Allard theory were solved by applying the Galerkin method in ref.…”

Section: Introductionmentioning

confidence: 99%

Exact solution of the plane problems for poroelastic rectangle and semi‐strip

Zhuravlova

2022

Z Angew Math Mech

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The exact solutions of the plane problems of poroelasticity for a rectangle and a semi-strip are derived in the article. The original problems are reduced to one-dimensional problems with the help of finite and semi-infinite Fourier transforms for a rectangle and a semi-strip, respectively. The one-dimensional boundary value problems are formulated in vector form, and the apparatus of matrix differential calculation is used. Analytical formulas for displacements, stress, and pore pressure are derived for the rectangle and semi-strip. The investigation of stress and pore pressure for different load types and different poroelastic materials is done for the rectangle and semi-strip.

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Poroelastic lamellar metamaterial for sound attenuation in a rectangular duct

Cited by 12 publications

References 42 publications

On the use of structured poroelastic materials for noise control at low frequency

On the use of structured poroelastic materials for noise control at low frequency

Evaluating of Noise Reduction Techniques for Turboengine Test Stands: A Preliminary Analysis

Exact solution of the plane problems for poroelastic rectangle and semi‐strip

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