Semi-Active Sound Absorption Method with Acoustic Impedance Matching  

基于阻抗匹配的半主动吸声方法

作　　者：ZHU Congyun ZHANG Shaoqi DING Guofang 朱从云;张少奇;丁国芳(中原工学院智能机电工程学院(工业设计学院),河南郑州450007)

机构地区：[1]School of Intelligent Mechatronics Engineering(School of Industrial Design),Zhongyuan University of Technology,Zhengzhou 450007,China

出　　处：《Journal of Donghua University(English Edition)》2025年第1期64-70,共7页东华大学学报(英文版)

基　　金：National Natural Science Foundation of China(No.51705545)。

摘　　要：The active sound absorption technique excels in mitigating low-frequency sound waves,yet it falls short when dealing with medium and high-frequency sound waves.To enhance the sound-absorbing effect of medium and high-frequency sound waves,a novel semi-active sound absorption method has been introduced.This method modulates the surface impedance of a loudspeaker positioned behind the sound-absorbing material,thereby altering the sound absorption coefficient.The theoretical sound absorption coefficient is calculated using MATLAB and compared with the experimental one.Results show that the method can effectively modulates the absorption coefficient in response to varying incident sound wave frequencies,ensuring that it remains at its peak value.主动吸声技术在降低低频声波方面表现出色,但在处理中高频声波时却表现不佳。为了提高中高频声波的吸声效果,提出了一种新型的半主动吸声方法。该方法调节吸声材料后扬声器的表面阻抗,将可控扬声器置于吸声材料后面,调节其表面阻抗,使其与空气的声阻抗达到最佳匹配,进而实现吸声性能的有效调控。利用MATLAB计算理论吸声系数,并将其与试验测得的吸声系数进行比较。结果表明,该方法可以在不断改变入射声波频率的情况下对吸声系数进行有效调整,使吸声系数始终处于最大值。

关 键 词：acoustic impedance semi-active sound absorption rigid wall cavity depth sound absorption coefficient 

分 类 号：TB53[理学—物理]