›› 2012, Vol. ›› Issue (03): 545-550.

• 论文 • 上一篇    下一篇

基于现场测量的多孔材料声学特性参数估计

王彬星, 郑四发, 刘海涛, 连小珉   

  1. 清华大学 汽车安全与节能国家重点实验室, 北京 100084
  • 收稿日期:2011-02-12 出版日期:2012-05-01
  • 基金资助:
    北京市科技计划重大项目(D101106047510001).

Estimation of acoustic characteristic of porous material based on in-situ measurement

WANG Bin-xing, ZHENG Si-fa, LIU Hai-tao, LIAN Xiao-min   

  1. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China
  • Received:2011-02-12 Online:2012-05-01

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。

关键词: 车辆工程, 多孔材料, 声学特性, 现场测量

Abstract: 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.

Key words: vehicle engineering, porous material, acoustic characteristic, in-situ measurement

中图分类号: 

  • U465
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