Sound transmission through sandwich constructions

Ford, R.D.; Lord, Peter; Walker, A.W.

doi:10.1016/0022-460x(67)90173-3

Cited by 68 publications

(45 citation statements)

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“…Most of the references mentioned here have adopted this method. The second, "wave approach", is based on modeling each subsystem as a superposition of waves travelling throughout the subsystem [13][14][15].…”

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confidence: 99%

Sound Transmission Loss Prediction of the Composite Fuselage with Different Methods

2011

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Increase of sound transmission loss(TL) of the fuselage is vital to build a comfortable cabin environment. In this paper, to find a convenient and accurate means for predicting the fuselage TL, the fuselage is modeled as a composite cylinder, and its TL is predicted with the analytical, the statistic energy analysis (SEA) and the hybrid FE&SEA method. The TL results predicted by the three methods are compared to each other and they show good agreement, but in terms of model building the SEA method is the most convenient one. Therefore, the parameters including the layup, the materials, the geometry, and the structure type are studied with the SEA method. It is observed that asymmetric laminates provide better sound insulation in general. It is further found that glass fiber laminates result in the best sound insulation as compared with graphite and aramid fiber laminates. In addition, the cylinder length has little influence on the sound insulation, while an increase of the radius considerably reduces the TL at low frequencies. Finally, by a comparison among an unstiffened laminate, a sandwich panel and a stiffened panel, the sandwich panel presents the largest TL at high frequencies and the stiffened panel demonstrates the poorest sound insulation at all frequencies.

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confidence: 99%

Sound Transmission Loss Prediction of the Composite Fuselage with Different Methods

2011

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“…Flexural modes occur parallel to the panel and dilatational modes occur perpendicular to the panel (transverse). Both types of vibration are dispersive: that is, the propagation speed of the sound in the solid material depends on the frequency [23].…”

Section: Sandwich Panelsmentioning

confidence: 99%

“…The skin}core}skin system acts like a mass}spring}mass system like double panel. There is a mass}core}mass resonance frequency called dilatational resonance f B calculated by [23] …”

Section: Sandwich Panelsmentioning

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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“…Nevertheless, the model assumed the core to be incompressible, and the deformation of the panel in the thickness sense could not be modelled. Dym and Lang [8] were the first to develop a structural model for an infinite sandwich panel by using the kinematic assumptions of [9] and derived the five equations of motion corresponding to the symmetric and antisymmetric motion of the panel. Moore and Lyon [10] extended this structural model to symmetric sandwiches with an orthotropic core.…”

Section: Introductionmentioning

confidence: 99%

Computing the broadband vibroacoustic response of arbitrarily thick layered panels by a wave finite element approach

et al. 2014

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A robust procedure for the prediction of the dynamic response of layered panels within a SEA wave-context approach is proposed hereby. The dispersion characteristics of two dimensional composite orthotropic structures are predicted using a Wave Finite Element method. By manipulating the mass and stiffness matrices of the modelled structural segment a polynomial eigenvalue problem is formed, the solutions of which correspond to the propagation constants of the waves travelling within the structure. The wavenumbers and group velocities for waves comprising out of plane structural displacements can then be calculated. Using the numerically extracted wave propagation data the most important SEA quantities of the structure, namely the modal density and the radiation efficiency of each wave type are calculated. The vibroacoustic response of the structure under a broadband diffused excitation is then computed within a SEA approach. The impact of the symmetric and the antisymmetric vibrational motion of the panel on its sound transmission loss is exhibited and the approach proves robust enough for thin as well as for thick layered structures.

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Sound transmission through sandwich constructions

Cited by 68 publications

References 1 publication

Sound Transmission Loss Prediction of the Composite Fuselage with Different Methods

Sound Transmission Loss Prediction of the Composite Fuselage with Different Methods

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

Computing the broadband vibroacoustic response of arbitrarily thick layered panels by a wave finite element approach

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