摘要
研究了一种基于现场测量估计多孔材料的特征阻抗和波数等参数的方法。该方法利用PU探头可以同时测量声场中某一点的声压和质点运动速度的特点,借鉴双空腔法原理,通过测量不同边界条件下多孔材料的表面阻抗,经过计算得到材料的特征阻抗和波数。并对不同的边界条件进行了比较,确定了比较合适的边界条件组合。通过试验值与计算值的对比,对该方法进行了验证。该方法克服了基于阻抗管方法的缺点,具有方便、快捷等特点。
A method to estimate the characteristic impedance and the wave number of porous material was proposed based on in-situ measurement.The feature of the PU probe which can measure the pressure and the particle velocity at one point simultaneously was used to measure the surface impedances of porous material at different boundary conditions by means of the principle of the 2-cavity method,and the characteristic impedance and the wave number were abtained by calculation.Different boundary conditions were compared and suitable boundary condition combination was determined.With the comparison of measurement data and calculation results,the method proved to be accurate and of practical use.Compared to the methods based on the impedance tube,it is more convenient.
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2012年第3期545-550,共6页
Journal of Jilin University:Engineering and Technology Edition
基金
北京市科技计划重大项目(D101106047510001)
关键词
车辆工程
多孔材料
声学特性
现场测量
vehicle engineering
porous material
acoustic characteristic
in-situ measurement
