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research-article

Mechanical and acoustic performance of sandwich panels with hybrid cellular cores

[+] Author and Article Information
Qing Li

State Key Laboratory of Ocean Engineering, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
liqing5504@sjtu.edu.cn

Deqing Yang

State Key Laboratory of Ocean Engineering, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
yangdq@sjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4040514 History: Received February 02, 2018; Revised June 01, 2018

Abstract

Sandwich structures that are embedded with cellular materials show excellent performance in terms of mechanics, electromagnetics and acoustics. In this paper, sandwich panels with hybrid cellular cores of hexagonal, re-entrant hexagonal and rectangular configurations along the panel surface are designed. The spectral element method (SEM) is applied to accurately predict the dynamic performance of the sandwich panels with a reduced number of elements and the system scale within a wide frequency range. The mechanical and acoustic performance of the proposed structures is investigated and compared with conventional honeycomb panels with fixed cell geometries. It was found that the bending stiffness, fundamental frequencies and sound transmission loss (STL) of the presented sandwich panels can be effectively changed by adjusting their hybrid cellular core configurations. A shape optimization design for a hybrid cellular core for maximum STL is presented for specified tonal and frequency band cases. Besides, hybrid sandwich panels can increase sound insulation by 24.7%, 20.6%, and 109.6% for those cases, respectively, compared with conventional panels in this study. These results indicate the potential of sandwich structures with hybrid cellular cores in acoustic attenuation applications. Hybrid cellular cores can lead to inhomogeneous mechanical performance and constitute a broader platform for the optimum mechanical or acoustic design of sandwich structures.

Copyright (c) 2018 by ASME
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