周期加筋及条形阻尼对薄板声辐射特性的影响

采用有限元和边界元的算法，对薄板采用不同的加筋及条形阻尼的处理方式进行了仿真计算。结果表明：薄板采用单向及双向加筋的处理方式，能有效减小结构的模态密度，降低低频结构声辐射，但对于中高频段的结构声辐射并没有起到降低的作用；通过加单向和双向条形阻尼的处理方式，能在全频段内有效降低结构声辐射，但由于整体结构刚度较小，其降低结构声辐射的效果有限；而薄板采用混合加筋及条形阻尼的处理方式，其降噪效果最为明显。

Discussion on the Effect of Stiffeners and Damping Strips on the Acoustic Radiation Performance of the Plate Structure

By using finite element method and boundary element method, the simulation calculation of the plate based on different stiffeners and damping strips was performed in this paper. The results shows that the plate based on biaxial and uniaxial stiffeners can decrease the modal density of the structure and reduce the low frequency structure acoustic radiation effectively, but don＇t have an effect on high frequency struc- ture acoustic radiation; the plate based on biaxial and uniaxial damping strips can reduce the structural a- coustic radiation in the whole frequency band, but due to the weak stiffness, the effectiveness of reducing the low frequency structure acoustic radiation is limited; but for the plate based on stiffener and damping strips, the noise reduction effect is the most obvious.