Analytical modeling of sound transmission through clamped triple-panel partition separated by enclosed air cavities
- F. X. Xin, T. J. Lu
- European Journal of Mechanics A/Solids 30 (6)
In this paper, previous theories on the prediction of sound transmission loss for a double-panel structure lined with poroelastic materials are extended to address the problem of a triple-panel structure. Six typical configurations are considered for a triple-panel structure based on the method of coupling the porous layers to the facing panels which determines critically the sound insulation performance of the system. The transfer matrix method is employed to solve the system by applying appropriate types of boundary conditions for these configurations. The transmission loss of the triple-panel structures in a diffuse sound field is calculated as a function of frequency and compared with that of corresponding double-panel structures. Generally, the triple-panel structure with poroelastic linings has superior acoustic performance to the double-panel counterpart, remarkably in the mid-high frequency range and possibly at low frequencies, by selecting appropriate configurations in which those with two air gaps in the structure exhibit the best overall performance over the entire frequency range. The poroelastic ∗Corresponding author. Tel.: +44 1483 682352. Email address: email@example.com (Yu Liu) Preprint submitted to Journal of Sound and Vibration November 6, 2014 lining significantly lowers the cut-on frequency above which the triple-panel structure exhibits remarkably higher transmission loss. Compared with a double-panel structure, the wider range of system parameters for a triple-panel structure due to the additional partition provides more design space for tuning the sound insulation performance. Despite the increased structural complexity, the triple-panel structure lined with poroelastic materials has the obvious advantages over its double-panel counterpart while without the penalties in weight and volume, and is hence recommended as a promising replacement for the widely used double-panel sandwich structure in order to optimise the sound transmission loss.