Viscothermal fluid effects on vibro-acoustic behaviour of double elastic panels

Akrout, Ali; Karra, Chafik; Hammami, Lotfi; Haddar, Mohamed

doi:10.1016/j.ijmecsci.2007.11.005

Cited by 20 publications

(15 citation statements)

References 16 publications

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“…For lightweight double wall panels with thin air layers, this viscothermal damping level can be much higher than structural damping in the plates and radiation damping due to sound radiation to the environment. [20][21][22] As seen in the previous section, the transmission loss measurements for partitions with a rough surface show similar behavior to the double walls with felt inside the cavity. This shows that for thin air layers, not only absorptive material inside the cavity but also absorption at the cavity walls strongly influences transmission loss.…”

Section: Cavity Absorptionsupporting

confidence: 67%

“…The increased damping has only effect for resonant behavior of the panels and hardly influences the overall transmission loss, which is in the low-frequency region determined by the non-resonant or forced transmission (mass-law). More recently, Akrout et al 21,22 studied the vibro-acoustic behavior of double panels and laminated double glazing with a finite element model, including the effects of viscosity and thermal conductivity of the cavity air. The numerical results showed the importance of the viscothermal effects in the case of thin air layers.…”

Section: Introductionmentioning

confidence: 99%

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Sound transmission through finite lightweight multilayered structures with thin air layers

Dijckmans

Vermeir

Lauriks

2010

The Journal of the Acoustical Society of America

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The sound transmission loss (STL) of finite lightweight multilayered structures with thin air layers is studied in this paper. Two types of models are used to describe the vibro-acoustic behavior of these structures. Standard transfer matrix method assumes infinite layers and represents the plane wave propagation in the layers. A wave based model describes the direct sound transmission through a rectangular structure placed between two reverberant rooms. Full vibro-acoustic coupling between rooms, plates, and air cavities is taken into account. Comparison with double glazing measurements shows that this effect of vibro-acoustic coupling is important in lightweight double walls. For infinite structures, structural damping has no significant influence on STL below the coincidence frequency. In this frequency region, the non-resonant transmission or so-called mass-law behavior dominates sound transmission. Modal simulations suggest a large influence of structural damping on STL. This is confirmed by experiments with double fiberboard partitions and sandwich structures. The results show that for thin air layers, the damping induced by friction and viscous effects at the air gap surfaces can largely influence and improve the sound transmission characteristics.

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Section: Cavity Absorptionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Sound transmission through finite lightweight multilayered structures with thin air layers

Dijckmans

Vermeir

Lauriks

2010

The Journal of the Acoustical Society of America

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“…As discussed in [Akrout et al 2008b;2009;2010], the resolution of the coupled system (25) allows determining the coupled eigenfrequencies ω r ·C (r = 1, . .…”

Section: 4mentioning

confidence: 99%

“…This model is recently improved by Basten et al [2001] who developed an acousto-elastic model for a double elastic panel in which the viscothermal fluid cavity effects are taken into account. Besides, in [Akrout et al 2008b;2009;2010], a structural damping model of simple and laminated plates is coupled to the viscothermal fluid model developed by Basten et al in order to obtain a new configuration of fluid-structure coupled system. In this case, the classical modal analysis is mixed with an iterative procedure in order to calculate the vibro-acoustic modes.…”

Section: Introductionmentioning

confidence: 99%

Edge stiffness effects on thin-film laminated double glazing system dynamical behavior by the operational modal analysis

Akrout¹,

Chaabane²,

Hammami³

et al. 2012

J. Mech. Mater. Struct.

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We apply operational modal analysis (OMA) to determine the eigenfrequencies and the eigenmode shapes of a thin-film laminated double glazing system. For this purpose, the dynamic behaviors of both a laminate alone and a coupled system (double-wall structure) for specific boundary conditions are investigated. Here, the laminated plate which is composed of two elastic skins joined with an adhesive ultra-thin film is bonded by an elastic joint. Thus, two configurations of the thin-film laminated glass plate elastic boundary conditions are considered. The first one assumes that the structure is bonded by a translational stiffness (linear springs). In the second one, besides the translational stiffness, a rotational stiffness (angular springs) is introduced in order to improve the developed model. The modal recombination results of a thin-film laminated glass plate as well as those of the thin-film laminated double glazing system are presented and compared to the estimated modes achieved by OMA. Since a good agreement is obtained, the OMA technique can be used to determine the modal parameters by considering the experimental vibratory responses of the studied system. In addition, the vibration's amplitude of two laminated glass plates linked from edge to edge with both linear and angular springs can be much reduced compared to the one of the same structure bonded only by linear springs.

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“…In [10], the SEA is used for predicting sound transmission through double walls and for computing the non-resonant loss factor. In [11], FEM is applied to study the viscothermal fluid effects on vibro-acoustic behaviour of double elastic panels. The FEM is applied in [12] by the authors for the different layers of the sound barrier coupled to a variational BEM to account for fluid loading.…”

Section: Introductionmentioning

confidence: 99%

Finite element reduced order model for noise and vibration reduction of double sandwich panels using shunted piezoelectric patches

Larbi¹,

Deü²,

Ohayon³

2016

Applied Acoustics

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Viscothermal fluid effects on vibro-acoustic behaviour of double elastic panels

Cited by 20 publications

References 16 publications

Sound transmission through finite lightweight multilayered structures with thin air layers

Sound transmission through finite lightweight multilayered structures with thin air layers

Edge stiffness effects on thin-film laminated double glazing system dynamical behavior by the operational modal analysis

Finite element reduced order model for noise and vibration reduction of double sandwich panels using shunted piezoelectric patches

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