The transmission loss of double panels

Mulholland, K.A.; Parbrook, H.D.; Cummings, A.

doi:10.1016/0022-460x(67)90205-2

Cited by 107 publications

(38 citation statements)

References 4 publications

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“…2,14,26,27,[34][35][36] The problem of modeling cavity absorption was already mentioned by Hongisto. 17 The most problematic situation that none of the models investigated by Hongisto can deal with is very thin and empty cavities (d < 30 mm).…”

Section: Cavity Absorptionmentioning

confidence: 99%

“…To validate this assumption, comparison is made with the multiple reflection theory. 2 In this model, sound incident on an infinite double panel is treated as a ray which is successively reflected by and transmitted through each panel. The absorption coefficient of the cavity walls is taken into account locally, by reducing the fraction reflected by a panel with a factor (1 À a s ).…”

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: Cavity Absorptionmentioning

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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“…where m g is the maximum incident angle, varying between 70° and 85° (78° in this study) (Mulholland et al, 1967 …”

Section: Tl Predictionmentioning

confidence: 99%

A study on acoustic behavior of poroelastic media bonded between laminated composite panels

Shojaeefard

Talebitooti

Ahmadi

et al. 2014

Lat. Am. j. solids struct.

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A study on the acoustic behavior of double-walled panels, with sandwiched layer of porous materials is presented within Classical Laminated Plate Theory (CLPT) for laminated composite panels. For this purpose, equations of wave propagation are firstly extracted based on Biot's theory for porous materials, then the transmission loss (TL) of the structure is estimated in a broadband frequency. Secondly, TL coefficient of the structure is determined using Statistical Energy Analysis (SEA). In the next step, accuracy of the solution is shown with comparing the data obtained from these two presented models as well as the experimental results available in literature. Finally, the effects of parameters on sound transmission loss of double porous composite panels, especially at a high frequency range, are discussed. In addition, the results show that maximum sound energy is transferred through the waves frame (structure born) due to the porous layer bonded between the two composite panels. Therefore, material parameters that are principally related to solid phase of the foam such as Poisson's ratio, bulk density and bulk Young's modulus, have the most significant effects on the transmission loss. Meanwhile, the impacts of composite material panels and composite plies arrangement on sound transmission loss structures have been addressed in this paper. Keywords

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“…The Helmholtz frequency is comparable to the limit frequency f J in equation (9). The model developed "rstly by Mulholland et al [18] will be used in this study, The advantages of the model are that the acoustical data is easily obtained. The model was later improved by Cummings and Mulholland and the theory proved to give good results [19].…”

Section: The Effect Of Cavity Absorbentsmentioning

confidence: 99%

Sound Insulation of Doors—part 1: Prediction Models for Structural and Leak Transmission

Hongisto

2000

Journal of Sound and Vibration

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The transmission loss of double panels

Cited by 107 publications

References 4 publications

Sound transmission through finite lightweight multilayered structures with thin air layers

Sound transmission through finite lightweight multilayered structures with thin air layers

A study on acoustic behavior of poroelastic media bonded between laminated composite panels

Sound Insulation of Doors—part 1: Prediction Models for Structural and Leak Transmission

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