Trim FEM simulation of a dash and floor insulator cut out modules with structureborne and airborne excitations

Duval, Arnaud; Baratier, Julien; Morgenstern, Christian; Dejaeger, Ludovic; Kobayashi, Norimasa; Yamaoka, Hiroo

doi:10.1121/1.2934488

Cited by 12 publications

(8 citation statements)

References 7 publications

(7 reference statements)

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“…Finally, an example of an industrial application, courtesy of Faurecia (Duval et al 2008), is shown. The vibroacoustic response of a car floor module, excited by a shaker was measured at Faurecia labs.…”

Section: An Industrial Applicationmentioning

confidence: 99%

“…22 Example of the modelling of a fully trimmed car floor panel: (a) radiation problem, the floor panel is mechanically excited and radiates in a cavity; (b) transmission loss problem(Duval et al 2008).…”

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confidence: 99%

“…23 Example of model versus simulation of a floor panel with an insulation type trim(Duval et al 2008).…”

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confidence: 99%

“…24 Example of model versus simulation of a floor panel with an absorption type trim(Duval et al 2008).Trimmed floor panel configuration: Binappe carpet + Heavy layer 2kg/25 Example of model versus simulation of the transmission loss of a floor panel with an absorption type trim(Duval et al 2008).…”

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confidence: 99%

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Finite Element Modelling of Poroelastic Materials

2009

Propagation of Sound in Porous Media

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The vibroacoustic performance of finite multilayer systems containing poroelastic materials is of the utmost importance for noise control in automobiles, aircraft and several other engineering applications. In the absence of absorbing materials, the vibroacoustic response of complex multilayer structures are classically modelled using the finite element and the boundary element methods. To account for absorbing media, finite element formulations for sound absorbing materials have been developed. They range from simple approaches using equivalent fluid models (Craggs 1978, Beranek and Ver 1992, Panneton et al. 1995 to sophisticated approaches based on the

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Section: An Industrial Applicationmentioning

confidence: 99%

mentioning

confidence: 99%

“…23 Example of model versus simulation of a floor panel with an insulation type trim(Duval et al 2008).…”

mentioning

confidence: 99%

mentioning

confidence: 99%

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Finite Element Modelling of Poroelastic Materials

2009

Propagation of Sound in Porous Media

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“…Currently, there are many researches related to the dash panel, and they have reached many achievements. Duval [4] established the finite element model of the dash panel, computed transfer function and compared with experimental results. Results showed that they were consistent with each other.…”

Section: Introductionmentioning

confidence: 99%

Numerical optimization of sound pressure responses for the dash panel based on automatically matched layer and genetic algorithm

Zhang¹,

Zhang²

2017

J. vibroeng.

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The sound insulation performance of the dash panel has a direct influence on the level of sound absorption of the whole vehicle. Therefore, it is necessary to adopt proper optimization strategies to optimize the dash panel and interior sound pressure response. Firstly, damping loss factor was imported into the dash panel and the coupling model of interior acoustic cavity to compute the sound pressure response of the driver. Sound pressure response had multiple peak noises in the analyzed frequency band. With the increase of the analyzed frequency, Contours for the noise of interior acoustic cavity became increasingly dispersed. Secondly, reverberation chambers on both sides were coupled with the dash panel respectively to establish AML model. In this way, the computational transmission loss would be more consistent with the actual situation. AML method can directly obtain transmission loss without extracting the transmission sound power to compute transmission loss through relevant formulas. In reported papers, there are big differences between simulation and experiment in the low frequency because it is difficult to simulate the real boundary conditions. The computational results of this paper were more consistent with experimental results in the whole frequency band, which indicated that it was more effective to use AML method to compute the transmission loss of the dash panel. Then, a sound package was applied to the dash panel to conduct parametric analysis. Results showed that the thickness of the sound-absorption layer could effectively improve transmission loss over 250 Hz. When the thickness of the sound-absorption layer was 15 mm, transmission loss was relatively optimal. In addition, the thickness of the air layer had little influence on transmission loss. Finally, genetic algorithm was also used to optimize the parameters of sound package of the dash panel. Results showed that the optimized dash panel had a higher average transmission loss and total mass, and the average sound pressure response of the driver also decreased. Additionally, the transmission loss and sound pressure response of the driver optimized by genetic algorithm at each frequency point were improved in the analyzed frequency band to obtain a low-noise and lightweight dash panel.

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A Wave Based Method for the efficient solution of the 2D poroelastic Biot equations

Deckers

Hörlin²,

Vandepitte

et al. 2012

Computer Methods in Applied Mechanics and Engineering

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The vibro-acoustic behaviour of poroelastic materials is often formulated as boundary value problems based on the continuum mechanics Biot's theory expressed as two coupled partial differential equations. This paper presents an extension of the Wave Based Method (WBM), a numerical technique to solve these vibro-acoustic boundary value problems in a computationally efficient manner.At present, the Finite Element Method (FEM) is the most commonly used prediction technique to deal with these Biot equations, but suffers from the disadvantage that the system matrices have to be recalculated for each frequency of interest due to the frequency-dependent equation parameters.This harms the inherent effectiveness of the FEM. Additionally, due to the discretisation into a large number of small finite elements and the high number of unknowns per node, the computational efforts involved practically restrict the use of FEM to low-frequency applications. The method discussed in this paper is based on an indirect Trefftz approach. Exact solutions of the three coupled waves, supported by Biot's equations, are used as basis functions in a solution expansion to approximate the field variables in a poroelastic boundary value problem. This approach leads to smaller systems of equations, enabling an efficient solution at higher frequencies.

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Trim FEM simulation of a dash and floor insulator cut out modules with structureborne and airborne excitations

Cited by 12 publications

References 7 publications

Finite Element Modelling of Poroelastic Materials

Finite Element Modelling of Poroelastic Materials

Numerical optimization of sound pressure responses for the dash panel based on automatically matched layer and genetic algorithm

A Wave Based Method for the efficient solution of the 2D poroelastic Biot equations

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