组合空腔声学覆盖层声学性能分析及其优化设计  

Acoustic Performance Analysis and Optimization Design of the Anechoic Coating with a Composite Cavity

作　　者：廖琳 向阳[1,2] LIAO Lin;XIANG Yang(School of Energy and Power Engineering,Wuhan University of Technology,Wuhan 430063,China;Key Laboratory of Applied Transportation Technology in Ship Power Systems,Wuhan 430063,China)

机构地区：[1]武汉理工大学能源与动力工程学院,武汉430063 [2]船舶动力系统运用技术交通行业重点实验室,武汉430063

出　　处：《噪声与振动控制》2022年第2期10-16,58,共8页Noise and Vibration Control

基　　金：工信部资助项目(MC-201918-C10)。

摘　　要：为解决声学覆盖层在低频声学性能较差的问题,设计一种包含圆柱和圆台的组合空腔型覆盖层,利用软件COMSOL计算其在10 000 Hz以下的隔声量与吸声系数,研究覆盖层在不同结构尺寸下的声学性能,继而对组合空腔进行局部优化。结果显示:声学性能会随开孔率的增大而改善,且吸声性能曲线波峰往低频移动;当开孔率由圆台半径控制时,隔声量峰值频率往低频移动,当其由单胞半径控制时,则峰值频率往高频移动;当圆柱半径为1 mm、高度为10 mm时,声学性能相比其他尺寸空腔达到最优;对空腔中圆台结构的母线进行形状优化后,声学覆盖层声学性能得到改善。To solve the problem of poor acoustic performance of the anechoic coatings in low frequency range, a new type anechoic coating with a cylinder and cone combined cavity is designed. Its sound insulation and sound absorption coefficient below 10 000 Hz frequency are calculated by using the software COMSOL. The acoustic performances of the coatings with different structure sizes are studied. And the optimization of the cylinder and cone combined cavity is performed.Results show that with the increase of the perforation ratio, the acoustic performance will be improved, and the peak of sound absorption coefficient shifts toward the low frequency direction;the peak of sound insulation moves to low frequency direction when the perforation ratio is controlled by the radius of the frustum cone;while the peak moves to high frequency direction when it is controlled by the radius of the single cell. When the cylinder radius is 1 mm and the height is 10 mm, the acoustic performance reaches the optimal level compared with the other sizes of the cylinder. After the shape optimization of the generatrix of the frustum of the cone of the cavity, the acoustic performance of the anechoic coating are improved further.

关 键 词：声学 声学覆盖层 组合空腔 隔声量 吸声系数 形状优化 

分 类 号：TB564[交通运输工程—水声工程]