Sound transmission loss behavior of sandwich panel with different truss cores under external mean airflow

Abstract

This paper presents an analytical study on the sound transmission loss characteristics of sandwich plate with different truss cores under external mean airflow. Three types of truss cores are considered, which include pyramidal core, tetrahedral core and 3D-kagome core. The sandwich plate is immersed in a mean airflow of velocity tangential to the acoustically deformed boundary and it is impinged by a plane sound wave in the incident acoustic field. By applying velocity continuity condition at fluid–structure interfaces, the coupling of fluid–structure interaction is described analytically. The validity and feasibility of the proposed theoretical model are verified by comparisons with numerical simulation results calculated by commercial finite element software (LMS Virtual.Lab). Based on the developed theoretical model, the influences of the truss core radius and height, different truss core types, external mean flow and material combination types on sound transmission loss are subsequently presented.