摘要
为了测量高频材料吸声系数,采用声模态分解的方法,基于阻抗管构建测试设备,在阻抗管内测量超过平面波截止频率的的高频吸声系数。测量过程中,通过在阻抗管的周向和轴向分别布置传声器阵列,分离管道内前3阶周向声模态以及各阶声模态的轴向传播入射波和反射波,从而得到最高频率达10000 Hz的材料吸声系数,并通过对比常规阻抗管测试方法的测量结果,说明采用声模态分解法对高频材料吸声系数的准确性。
For measuring the sound absorption coefficient in the higher frequency range,multi-modal decomposition method in impedance tube is used to measure material sound absorption coefficient over the cut-off frequency of plane wave in the tube.In the process of measurement,the microphone array is placed along the circumferential and axial directions of the tube,and then decompose the first three acoustic circumferential modes and their axial incident and reflected waves.These measurement data can be used to calculate the material sound absorption efficient up to 10000 Hz.At last the precision of the multi-modal decomposition method is validated by comparing the measurement results of the common impedance tube method.
作者
孙中政
韩旭
王宇飞
SUN Zhongzheng;HAN Xu;WANG Yuefei(DuPont China Research&Development and Management Co.,Ltd,Shanghai 201203)
出处
《声学学报》
EI
CAS
CSCD
北大核心
2022年第2期229-240,共12页
Acta Acustica
