基于夹层板理论的圆形孔蜂窝结构隔声量研究

蜂窝夹层结构广泛应用于航空航天、船舶、高速列车等交通工具领域。基于三明治等效理论建立了圆形蜂窝结构层芯的等效剪切参数,从而得到简支边界条件下的圆形孔蜂窝夹层板的声振耦合振动模型及传声损失,并在仿真中数值验证了理论模型的正确性。同时基于理论计算,分析了圆形孔蜂窝结构中的层芯胞元半径、层芯壁厚和结构材料对隔声量的影响。由分析可知:层芯半径小、壁厚薄的钢材圆形蜂窝结构具有更好的隔声性能。

Study of the sound insulation of circular honeycomb structure based on sandwich platetheory

Honeycomb structure has been widely used in transportation vehicles such as aircrafts, ships, high-speed train. The paper defines the equivalent shear parameters of circular honeycomb sandwich core structure based on sandwich plate theory, and uses these parameters to derive the vibration coupling control equation and the sound transmission loss under simply supported boundary condition. The correctness of the theoretical calculation is validated by finite element simulation. And, according to the theoretical calculation formula, the effects of several parameters on sound transmission of circular honeycomb structure, such as the radius and wall thickness of honeycomb core and the structural material, are analyzed. From the analysis it is discovered that the steel circular honeycomb structure with smaller core radius and thinner wall thickness has better noise isolation performance.