An Efficient Finite Element Formulation for the Analysis of Acoustic and Elastic Waves Propagation in Sound Packages

Hamdi, Mohamed; Mebarek, L.; Omrani, Abderrazak; Atalla, Noureddine; Fortez, M.; Crignon, Guillaume; Lullier, S.

doi:10.4271/2001-01-1406

Cited by 13 publications

(4 citation statements)

References 12 publications

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“…Even though Biot`s theory was established in the middle of the 20th century [10,11], his findings were not implemented into trim modelling until the 1980s [18,19,20]. It was only then, when the application of Biot's theory in vehiccle analysis gained importance with the increasing sophistication of vehicle design.…”

Section: Poroelastic Materials As Non-structural Massmentioning

confidence: 99%

Review of Finite Element Vehicle Interior Acoustic Simulations Including Porous Materials

Kun

Feszty

2019

Acta Tech Jaur

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Recent trends in vehicle engineering require manufacturers to develop products with highly refined noise, vibration and harshness levels. The use of trim elements, which can be described as Poroelastic materials (PEM), are key to achieve quiet interiors. Finite Element Methods (FEM) provide established solutions to simple acoustic problems. However, the inclusion of poroelastic materials, especially at higher frequencies, proves to be a difficult issue to overcome. The goal of this paper was to summarize the state-of-the-art solutions to acoustic challenges involving FEM-PEM simulation methods. This involves investigation of measurement and simulation campaigns both on industrial and fundamental academic research levels.

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Section: Poroelastic Materials As Non-structural Massmentioning

confidence: 99%

Review of Finite Element Vehicle Interior Acoustic Simulations Including Porous Materials

Kun

Feszty

2019

Acta Tech Jaur

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“…2 As shown in Ref. 9, for e −it harmonic time dependency, the modified Biot equations can be easily derived by eliminating the fluid phase displacement vector U f from the system of Eqs. ͑1a͒, ͑1b͒, ͑2a͒, and ͑2b͒ in terms of the skeleton displacement, which for simplicity is denoted as U ͑without the prefix s͒ in the rest of the paper, and the interstitial fluid pressure p:…”

Section: The Modified Biot Equationsmentioning

confidence: 99%

“…A modified system of four Biot's equations, valid for nonspatially constant Biot's parameters, was established by Hamdi et al in Ref. 9. As described in Refs.…”

Section: Introductionmentioning

confidence: 99%

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Development of an analytical solution of modified Biot’s equations for the optimization of lightweight acoustic protection

Kanfoud

Hamdi

Bécot³

et al. 2009

The Journal of the Acoustical Society of America

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During lift-off, space launchers are submitted to high-level of acoustic loads, which may damage sensitive equipments. A special acoustic absorber has been previously integrated inside the fairing of space launchers to protect the payload. A new research project has been launched to develop a low cost fairing acoustic protection system using optimized layers of porous materials covered by a thin layer of fabric. An analytical model is used for the analysis of acoustic wave propagation within the multilayer porous media. Results have been validated by impedance tube measurements. A parametric study has been conducted to determine optimal mechanical and acoustical properties of the acoustic protection under dimensional thickness constraints. The effect of the mounting conditions has been studied. Results reveal the importance of the lateral constraints on the absorption coefficient particularly in the low frequency range. A transmission study has been carried out, where the fairing structure has been simulated by a limp mass layer. The transmission loss and noise reduction factors have been computed using Biot's theory and the local acoustic impedance approximation to represent the porous layer effect. Comparisons between the two models show the frequency domains for which the local impedance model is valid.

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Importance of the evaluation of structure-borne NVH performance for lightweight trim design

et al. 2019

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An Efficient Finite Element Formulation for the Analysis of Acoustic and Elastic Waves Propagation in Sound Packages

Cited by 13 publications

References 12 publications

Review of Finite Element Vehicle Interior Acoustic Simulations Including Porous Materials

Review of Finite Element Vehicle Interior Acoustic Simulations Including Porous Materials

Development of an analytical solution of modified Biot’s equations for the optimization of lightweight acoustic protection

Importance of the evaluation of structure-borne NVH performance for lightweight trim design

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