Sound transmission of composite sandwich panel with face-centered cubic core

Abstract

Enlightened by face-centered cubic crystal structure, an ultra-lightweight composite sandwich panel with face-centered cubic core (CSPFCC) is proposed, which demonstrates excellent broadband sound insulation as well as great mechanical property. Sound insulation of the new structure was studied experimentally and numerically. Simulation models are established with considerations of acoustic–structure interactions. The experimental results are consistent with the simulation results of CSPFCC. Furthermore, the effects of boundary conditions, material parameters and so forth on the acoustic properties of CSPFCC are studied by numerical model. In addition, the CSPFCC is compared with the composite quadrilateral honeycomb sandwich structure, and its property is better than that of the latter. Sound insulation property of the CSPFCC exhibits good quasi-isotropy, which provides guidance for the research of structural-functional integration design and engineering application.