Improvement Noise Insulation Performance of Polycarbonate Pane using Sandwich Structure

Abstract

Polycarbonate (PC) laminates offer the possibility of designing strong and light weight panes application in automobile. However, the noise insulation performance of PC pane is worse than glass pane because of its high rate of stiffness to low weight. In this work, a new ultra-thin(less than 10mm) sandwich pane is proposed to obtain high transmission loss(TL). The sandwich structure consists of two thin laminates plates of the same PC material and a thin lightweight damping core bonded between those plates. Then TL is predicted using decoupled equations representing symmetric and anti-symmetric motions for a sandwich PC pane. The effects of various structural and material parameters on noise insulation performance are investigated with numerical examples. Numerical results show that the shear rigidity has evident effect on coincidence frequency and proposed structure has better noise insulation properties than single layer PC pane of equivalent thickness.

Dynamic Response of Soft Core Sandwich Beams with Metal-Graphene Nanocomposite Skins

“…When these structures have soft and lightweight cores they confer simultaneously to the global sandwich structure a viscoelastically damped behaviour, which is very useful in several science and engineering applications, to attenuate structural vibration and noise, but also to enhance the fatigue endurance and impact resistance. Studies upon these effects and on the influence of some structural parameters were carried out recently by Wan et al [1] and by Shen et al [2]. The latter aspects have been addressed by Idriss et al [3], which monitored the debonding damage length in the core-skin interface of sandwich specimens through stiffness, hysteresis cycles, and damping ratios changes.…”