Sound insulation performance of pyramidal hollow lattice structures
CHEN Ting-ting1,2 LIU Jie1,2 TAN Dong-guo1,2 WEN Gui-lin1,2
1. State Key Lab of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha 410082, China;
2.College of Mechanical and Vehicle Engineering, Hunan University, ChangSha 410082, China）
Periodic lattice structures applied in spacecrafts as a new type structure require considering both structural lightweight and excellent sound insulation performance. In order to optimize the traditional pyramidal lattice structure lightweight design and improve its sound insulation effect, the space composition and sound insulation characteristics of pyramidal lattice structures with solid trusses and hollow trusses having the same geometrical parameters were studied here, it was found that the lightweight performance and sound insulation properties of pyramidal lattice structures with hollow trusses in most parts of frequency domain are better than those of pyramidal lattice structures with solid trusses. Based on the direct acoustic-vibration coupling theory, the sound insulation characteristics of pyramidal lattice structures with hollow trusses were studied systematically with numerical methods. The influences of several key structural parameters of hollow truss, such as, elevation angle, wall thickness, length, and cross section shape as well as crystal lattice constant and in-plane size of lattice structure on sound insulation characteristics of the system were analyzed. The results provided a reference for the acoustic optimization of lattice structures.
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