金字塔型空心点阵结构的隔声特性研究  

Sound insulation performance of pyramidal hollow lattice structures

作　　者：陈婷婷[1,2] 刘杰 谭栋国[1,2] 文桂林[1,2] 

机构地区：[1]汽车车身先进设计制造国家重点实验室,长沙410082 [2]湖南大学机械与运载工程学院,长沙410082

出　　处：《振动与冲击》2017年第23期209-215,231,共8页Journal of Vibration and Shock

基　　金：国家杰出青年科学基金(11225212);湖南省芙蓉学者特聘教授;智能型新能源汽车国家2011协同创新中心(796215004);湖南省绿色汽车2011协同创新中心(802115001)

摘　　要：周期点阵结构作为新型结构运用到航天器时,需要考虑结构的轻量化和隔声效果。为了优化传统金字塔型点阵结构的轻量化设计并且提高其隔声效果,研究相同几何参数的金字塔型实心和空心点阵结构的空间构成和隔声量曲线,发现金字塔型空心点阵结构更有利于结构的轻量化并且其隔声效果在大部分频段内优于金字塔型实心点阵结构。基于直接声振耦合理论,用数值方法系统研究了金字塔型空心点阵结构的隔声特性,分析了空心杆件仰俯角、空心杆件壁厚、空心杆件长度、空心杆件截面形状以及点阵结构的晶格常数、面内尺寸等重要结构参数对金字塔型空心点阵结构隔声特性的影响,为点阵结构的声学优化提供了有意义的参考。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 with 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.

关 键 词：点阵结构 空心杆件 声振耦合 隔声特性 

分 类 号：O422[理学—声学]