同济大学学报（自然科学版）2012，Vol.40Issue(10)：1573-1576,1588,5.DOI:10.3969/j.issn.0253-374x.2012.10.025
提高阻抗管测量频率上限的研究
Extended Frequency Range of Impedance Tube Measurement
摘要
Abstract
The paper presents a new method for extending the frequency range of impedance tube measurement. The method is based on decomposing and measuring higher-order mode waves in ducts and picking up (0, 0) mode of the incident- and reflected-wave for the material of uniform surface impedance. Therefore the normal-incidence absorption coefficient and the acoustic impedance can be determined. Compared with previous research, the limit of cut-off frequency in the tube can be avoided and the frequency range of measurement can be increased greatly. Finally, the verification test with the proposed method is carried out by adopting the single-microphone axial transmission system in a large vertical impedance tube. From the test results, the upper limit frequency of the tube is extended from 280 Hz to 2 000 Hz or higher.关键词
截止频率/模式分解/管道/阻抗管测量/声学特性Key words
cut-off frequency/ modes decomposition/ duct/impedance tube measurement/ acoustic properties
分类
建筑与水利引用本文复制引用
冯善勇,莫方朔,赵跃英,盛胜我..提高阻抗管测量频率上限的研究[J].同济大学学报（自然科学版）,2012,40(10):1573-1576,1588,5.
