Abstract
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.
Highlights
In recent years, the use of high-performance materials that have light weight and high stiffness, has been increasing in many fields of engineering
This theory was presented on the basis of acoustic modeling of the porous materials where the solid phase was assumed without deformation
The elastic porous material is directly bonded to a panel, four BCs are obtained from the interface between the porous and composite layers (Bolton et al, 1996): Uy = Wt uy = Wt
Summary
The use of high-performance materials that have light weight and high stiffness, has been increasing in many fields of engineering. Xiandi Zeng et al studied the effect of laminated steel body panels on sound pressure level inside a car (Zeng et al, 2002) They have simulated the SEA model of a vehicle and compared transmission loss of the laminated panels with the conventional one. The equations of wave propagation are extracted based on this theory, considering viscous and inertia coupling in dynamic equation, as well as stress transfer, thermal and elastic coupling in stress-strain relationships of porous material and vibration equations of composite layers. Solving these equations along with boundary conditions, simultaneously the transmission loss of a structure will be calculated. The influence of effective parameters of this structure on the transmission loss of the multilayer systems, will be studied at high frequencies
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