摘要
表征吸声材料的主要物理参量一般有:吸声系数a、流阻Rf、孔隙率q、结构因子s。在噪声控制工程中,最常用的是吸声系数a,而a的大小与Rf、q、s是密切相关的。本文采用混响法测量微穿孔板后空腔吸声系数,研究微穿孔板后空腔对吸声效果的影响。实验表明,通过对比后空腔D=0mm和D=100mm吸声数据验证得出微孔板加上一定的后空腔可以做成宽频带良好的吸声结构。
The main physical parameters that characterize sound absorption materials are generally sound absorption coefficient a,flow resistance Rf,porosity qand structure factor s. In noise control engineering,the most commonly used sound absorption coefficient is a,and the size of a is closely related to Rf,q,s. In this paper,the sound absorption coefficient of the cavity behind the microperforated plate is measured by reverberation method,and the influence of the cavity behind the microperforated plate on the sound absorption effect is studied. Experiments show that by comparing the sound absorption data of the rear cavity D = 0 mm and D = 100 mm,it can be concluded that the microporous plate with a certain rear cavity can make a good sound absorption structure in broadband.
作者
陈华
李广智
杨德俊
何卓斌
Chen hua;Li Guangzhi;Yang Dejun;He Zhuobin
出处
《计量与测试技术》
2019年第2期15-16,共2页
Metrology & Measurement Technique
关键词
混响吸声
吸声系数
穿孔板
sound absorption
absorption coefficient
perforated board
作者简介
陈华,男,工学硕士,工程师,工作单位:广东省计量科学研究院。
