弹性边界下机械阻抗板面积对吸声性能影响  

The influence of mechanical impedance plate area on its sound absorption performance under elastic boundary condition

作　　者：范启隆 丁瑞[1] 于永杰[1] 赵晓丹[1] FAN Qilong;DING Rui;YU Yongjie;ZHAO Xiaodan(School of Automobile and Traffic Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China)

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《声学技术》2021年第1期104-109,共6页Technical Acoustics

基　　金：江苏高校优势学科建设工程基金资助项目(PAPD);江苏高校品牌专业建设工程基金资助项目。

摘　　要：文章研究了机械阻抗板吸声结构性能与板面积的关系,通过分析获得了机械阻抗板吸声结构的声品质因子和相对声阻率随面积变化的关系式,在此关系式的指导下讨论板面积增大对结构吸声性能的影响。结果表明:对相同材料制成的机械阻抗板吸声结构,随着板边长从0.1 m增大到0.6 m,结构的吸声频率向低频移动,吸声带宽稍微变窄,吸声系数先增大后减小。板面积扩大后需要调整板质量和黏弹性材料的阻尼,以保持结构的吸声峰频率不变,同时能够提高吸声系数的峰值,拓宽吸声频带。掌握机械阻抗板吸声结构性能随面积变化的规律对实际工程应用有指导意义。In this paper,the relationship between the performance of the mechanical impedance plate sound absorption structure and the plate area is studied.By analysis,the relationships between the acoustic quality factor and the relative acoustic resistance of the mechanical impedance plate absorption structure with plate area are obtained.Under the guidance of the relationships,the influence of increasing the plate area on the structural sound absorption performance is discussed.The results show that for the mechanical impedance plate sound absorption structure made of the same material,with the plate side length increasing from 0.1 m to 0.6 m,the frequency band of structural sound absorption moves toward low frequency and the bandwidth is slightly narrowed down;moreover,the peak value of the sound absorption coefficient increases first and then decreases.After the plate area being increased,the plate mass and the damping of the viscoelastic material need to be adjusted for keeping the structural sound absorption peak frequency constant,and meantime,the peak of the sound absorption coefficient can be increased and the sound absorption band can be widened.The study in this paper has guiding significance for practical engineering applications.

关 键 词：吸声 机械阻抗板 声品质因子 相对声阻率 驻波管 

分 类 号：TB535[理学—物理]