Prediction of transmission loss of double panels with a patch-mobility method

Chazot, Jean‐Daniel; Guyader, Jean‐Louis

doi:10.1121/1.2395920

Cited by 89 publications

(71 citation statements)

References 25 publications

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“…Especially for double walls, where sound transmission is strongly dependent on angle of incidence, it is important to take into account the source room characteristics. 34 The finite dimensions of the glass panes and the air layer in between, results in a specific vibro-acoustic coupling mechanism. For infinite structures, as assumed in TMM, the air layer stiffness, as seen by the glass panes, is strongly dependent on the angle of incidence h of the plane wave.…”

Section: Vibro-acoustic Couplingmentioning

confidence: 99%

“…The discrepancy between measurement results and infinite layer simulations in the frequency range between the mass-springmass-resonance dip and the coincidence dip can be explained by the finite dimensions. In literature, 14,27,[34][35][36] one often introduces cavity damping or cavity absorption when modeling double walls with empty cavities. However, sound absorption coefficients which are higher than the physical sound absorption coefficients have to be assumed for infinite models.…”

Section: Cavity Absorptionmentioning

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: Vibro-acoustic Couplingmentioning

confidence: 99%

Section: Cavity Absorptionmentioning

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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“…Indeed, the use of a mobility technique makes it possible to characterize each component of the vibro-acoustic problem separately, either analytically or numerically, and then to calculate the global response, solving the interaction equation. If one element is modified, then only its own characterization has to be calculated before solving interaction equations (Chazot and Guyader 2007).…”

Section: Patch-mobility Approachmentioning

confidence: 99%

Recent Advances in the Sound Insulation Properties of Bio-based Materials

Zhu¹,

Kim²,

Wang³

et al. 2013

BioResources

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Many bio-based materials, which have lower environmental impact than traditional synthetic materials, show good sound absorbing and sound insulation performances. This review highlights progress in sound transmission properties of bio-based materials and provides a comprehensive account of various multiporous bio-based materials and multilayered structures used in sound absorption and insulation products. Furthermore, principal models of sound transmission are discussed in order to aid in an understanding of sound transmission properties of bio-based materials. In addition, the review presents discussions on the composite structure optimization and future research in using co-extruded wood plastic composite for sound insulation control. This review contributes to the body of knowledge on the sound transmission properties of bio-based materials, provides a better understanding of the models of some multiporous bio-based materials and multilayered structures, and contributes to the wider adoption of bio-based materials as sound absorbers.

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“…The size of the patches should be less than the half-wavelength (i.e., k/2) corresponding to the highest frequency of interest, either acoustic or structural, whichever is less. 12,14 The PTFs are defined for each subsystem, with all quantities being defined with respect to the unit normal vectorñ to the coupling surface S c . For the structure, a constant normal force f s i is prescribed on patch i, whereas no force is prescribed on the other patches.…”

Section: Principle Of Ptf Approachmentioning

confidence: 99%

“…These calculations have been developed and validated for different applications. [12][13][14] The method, however, has not been used to treat a MPP element, as it cannot be categorized into any of the existing conventional subsystems. It should be noted that, calculations of PTFs are performed beforehand for each subsystem separately.…”

Section: Introductionmentioning

confidence: 99%

Modeling of micro-perforated panels in a complex vibro-acoustic environment using patch transfer function approach

Maxit

Yang

et al. 2012

The Journal of the Acoustical Society of America

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A micro-perforated panel (MPP) with a backing cavity is a well known device for efficient noise absorption. This configuration has been thoroughly studied in the experimental conditions of an acoustic tube (Kundt tube), in which the MPP is excited by a normal incident plane wave in one dimension. In a more practical situation, the efficiency of MPP may be influenced by the vibro-acoustic behavior of the surrounding systems as well as excitation. To deal with this problem, a vibro-acoustic formulation based on the patch transfer functions (PTF) approach is proposed to model the behavior of a micro-perforated structure in a complex vibro-acoustic environment. PTF is a substructuring approach, which allows assembling different vibro-acoustic subsystems through coupled surfaces. Upon casting micro-perforations and the flexibility of the MPP under transfer function framework, the proposed PTF formulation provides explicit representation of the coupling between subsystems and facilitates physical interpretation. As an illustration example, application to a MPP with a backing cavity located in an infinite baffle is demonstrated. The proposed PTF formulation is finally validated through comparison with experimental measurements available in the literature.

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Prediction of transmission loss of double panels with a patch-mobility method

Cited by 89 publications

References 25 publications

Sound transmission through finite lightweight multilayered structures with thin air layers

Sound transmission through finite lightweight multilayered structures with thin air layers

Recent Advances in the Sound Insulation Properties of Bio-based Materials

Modeling of micro-perforated panels in a complex vibro-acoustic environment using patch transfer function approach

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