Measurement the Noise Reduction of Doubly Curved Composite Sandwich Structures

Abstract

Traditional single-layer panels are typically made of a thin metal or plastic and are often unsuitable for an interior finish because thin limp panels do not have enough resistance to combined acoustic-thermal loading. For medium and low frequencies, panels usually require a relatively large absorber thickness and weight. The sound absorber presented is a composite sandwich panel with an air gap between a comparatively stiff thick panel and a flexible thin plate. Under thermal loading, the flexible thin plate is buckled. When suitably adjusted to a particular curvature, an increase in stiffness is obtained which can increase the sound insulation by up to 27 dB between 250 Hz and 500 Hz.

Acoustic insulation characteristics improvement of a thick CNT-reinforced doubly-curved shell by using GPLRC and MEE composite layers

“…Lee and Kim [50] presented an exact solution for the acoustic transmission through an infinite cylindrical structure stiffened by periodic cylindrical rings. The acoustic analysis of sandwich composite curved panels under thermal loading with air gap insulation was proposed by Tang [51]. Xin et al [52]designed an experimental model to study the vibroacoustic response of double-walled sandwich structures.…”