The influence of finite cavities on the sound insulation of double-plate structures

Brunskog, Jonas

doi:10.1121/1.1904264

Cited by 37 publications

(38 citation statements)

References 14 publications

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“…Note, however, that these expressions (piecewise-defined in the frequency domain) are based on ad-hoc considerations, not in any governing equation. This contrasts with [2,3,4,5], which solve the vibroacoustic equations of the double wall (i.e. clear physical foundations) by means of a wave approach.…”

Section: Modelsmentioning

confidence: 99%

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The Role of Studs in the Sound Transmission of Double Walls

Poblet-Puig¹,

Ferran²,

Guigou‐Carter³

et al. 2009

Acta Acustica united with Acustica

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Steel studs are used in double walls to provide structural stability. This creates a vibration transmission path between leaves that can often be more critical than the airborne path through the cavity. Some of the existing models for sound transmission consider the studs as elastic springs. The spring stiffness may be taken as the cross-section elastic stiffness of the stud, but this leads to an underestimation of the vibration transmission. A procedure to obtain more accurate parameters to be used in vibration and sound insulation models is presented. The results show that they must be obtained from dynamic models and/or experiments.

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Section: Modelsmentioning

confidence: 99%

“…It has been found that the stiffness of the connector has important effects on the radiated acoustic power. A complete model of sound transmission through double walls is developed in [5]. Both the cavity and the stud paths between infinite homogeneous plates are accounted for.…”

Section: Modelsmentioning

confidence: 99%

The Role of Studs in the Sound Transmission of Double Walls

Poblet-Puig¹,

Ferran²,

Guigou‐Carter³

et al. 2009

Acta Acustica united with Acustica

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show abstract

“…is the error function related to the respective boundary conditions (13) and coupling conditions (14) and (15). …”

Section: Continuity and Boundary Conditionsmentioning

confidence: 99%

“…Modal models have been developed which reduce the computation cost and therefore make simulations possible up to a higher frequency. [12][13][14][15] For single-layered walls, the consideration of full coupling between room modes and bending wave modes of the plate is not necessary in many cases. 16 For multilayered structures like double walls, the interaction between the vibrations of the panels and the acoustic pressure in the air gap cannot be neglected.…”

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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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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“…One of them is the use of modal bases for solving the differential equations, as done by Sjökvist et al [36], Brunskog [11] and Chung and Emms [17]. It consists of expressing the vibration and acoustic fields in terms of the eigenfunctions of the problem.…”

Section: Introductionmentioning

confidence: 99%

The finite layer method for modelling the sound transmission through double walls

Díaz-Cereceda

Poblet-Puig

Ferran

2012

Journal of Sound and Vibration

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The finite layer method (FLM) is presented as a discretisation technique for the computation of noise transmission through double walls. It combines a finite element method (FEM) discretisation in the direction perpendicular to the wall with trigonometric functions in the two in-plane directions. It is used for solving the Helmholtz equation at the cavity inside the double wall, while the wall leaves are modelled with the thin plate equation and solved with modal analysis. Other approaches to this problem are described here (and adapted where needed) in order to compare them with the FLM. They range from impedance models of the double wall behaviour to different numerical methods for solving the Helmholtz equation in the cavity. For the examples simulated in this work (impact noise and airborne sound transmission), the former are less accurate than the latter at low frequencies. The main advantage of FLM over the other discretisation techniques is the possibility of extending it to multilayered structures without changing the interpolation functions and with an affordable computational cost. This potential is illustrated with a calculation of the noise transmission through a multilayered structure: a double wall partially filled with absorbing material.

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The influence of finite cavities on the sound insulation of double-plate structures

Cited by 37 publications

References 14 publications

The Role of Studs in the Sound Transmission of Double Walls

The Role of Studs in the Sound Transmission of Double Walls

Sound transmission through finite lightweight multilayered structures with thin air layers

The finite layer method for modelling the sound transmission through double walls

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