使用脉冲声和矢量传声器的现场测量吸声系数  

In situ measurement of sound absorption coefficient using impulse sound and pressure-particle velocity probe

作　　者：陈昕 赵静 陈志菲[2] 侯宏[1] 鲍明[2] 杨建华[4] CHEN Xin;ZHAO Jing;CHEN Zhifei;HOU Hong;BAO Ming;YANG Jianhua(School of Marine Science and Technology,Northwestern Polytechnical University,Xi'an 710072,China;Institute of Acoustics,Chinese Academy of Sciences,Bejjing 100190,China;Key Laboratory of Aerodynamic Noise Control,Mianyang 621000,China;School of Automa tion,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学航海学院,西安710072 [2]中国科学院声学研究所,北京100190 [3]气动噪声控制重点实验室,绵阳621000 [4]西北工业大学自动化学院,西安710072

出　　处：《应用声学》2023年第6期1207-1214,共8页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(12174314);国家重点研发计划项目(2022YFB2602003)。

摘　　要：使用不同声源利用矢量传声器对毛毡材料进行现场吸声系数测试,研究了不同背景下不同声源的抗噪能力。矢量传声器可以同时测得声压和质点振速信号,进而可计算得到阻抗,利用自由空间和材料表面的阻抗可计算得到材料的吸声系数。在此次实验中,使用不同声源分别在无干扰和有一白噪声干扰源的两种情况下进行测试。结果表明,使用对数扫频脉冲和巴特沃斯脉冲测试所得的吸声系数曲线更平滑,说明脉冲声可以有效降低环境反射的影响,在高噪声背景下使用对数扫频脉冲测试所得的结果基本没有受到背景噪声的影响,说明对数扫频脉冲的抗噪能力更强。因此,使用对数扫频脉冲作为声源进行测试可有效减弱环境反射和背景噪声的影响。The on-site sound absorption coefficient test of the felt material was carried out with different sound sources and pressure-particle velocity probe,and the anti-noise ability of different sound sources under different backgrounds was studied.The probe can simultaneously measure the sound pressure and particle vibration velocity signals,and then calculate the impedance.The sound absorption coefficient of the material can be calculated by using the impedance of the free space and the surface of the material.In this experiment,different sound sources were used,and the tests were carried out in two cases,without interference and with a white noise interference source.The results show that the sound absorption coefficient curve obtained by using the logarithmic frequency sweep pulse and the Butterworth pulse test is smoother,indicating that the pulse sound can effectively reduce the impact of environmental reflections.The results obtained by using the logarithmic frequency sweep pulse test in a high noise background.It is basically not affected by the background noise,which shows that the anti-noise ability of the logarithmic frequency sweep pulse is stronger.Therefore,the use of logarithmic frequency sweep pulse as the sound source can effectively reduce the effects of environmental reflections and background noise.

关 键 词：矢量传声器 吸声系数 背景噪声 

分 类 号：O348.8[理学—固体力学]