Recently, sandwich structures have been widely used in different fields because of their good mechanical properties, but these structures are weak in acoustic performance. In this paper, by combining pyramidal truss core sandwich structure with frame, a new structure is proposed with both good mechanical properties and excellent acoustic performance at low frequency. An analytical model of the pyramidal truss core sandwich structure with frame is developed to investigate the sound transmission loss (STL) performance. Finite element method (FEM) is also used to investigate the STL performance at low frequency. The effects of the incident wave angle and the geometrical parameters on the STL of the structure are discussed.

近年来，夹层结构因其良好的力学性能而被广泛应用于不同领域，但这些结构的声学性能较弱。在本文中，通过将金字塔桁架芯夹层结构与框架相结合，提出了一种兼具良好力学性能和低频声学性能的新型结构。开发了带框架的金字塔桁架芯夹层结构的分析模型，以研究传声损失 (STL) 性能。有限元方法 (FEM) 也用于研究低频下的 STL 性能。讨论了入射波角和几何参数对结构STL的影响。