Journal of South China University of Technology (Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (7): 90-95,101.doi: 10.3969/j.issn.1000-565X.2016.07.014

• Architecture & Civil Engineering • Previous Articles     Next Articles

Accuracy Comparison Between Two Sound Intensity Arrays in Plane Wave and the Corresponding Numerical Analysis

WANG Hong-wei1,2 ZHANG Long1   

  1. 1.School of Architecture,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2016-03-11 Revised:2016-05-09 Online:2016-07-25 Published:2016-06-05
  • Contact: 王红卫(1975-)，男，博士，副教授，主要从事建筑和环境声学研究． E-mail:wanghw@scut.edu.cn
  • About author:王红卫(1975-)，男，博士，副教授，主要从事建筑和环境声学研究．
  • Supported by:
    Supported by the National Natural Science Foundation of China (51278198)and the Fund of China Scholarship Council(201308440043)

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Abstract: On the basis of the theoretical derivation of three-dimension sound intensity arrays in plane wave,firstly,the sound pressure and the particle velocity are estimated,and the sound intensity spectrum is calculated.Then,a comparison of amplitude bias and directional bias is made between a tetrahedral microphones system and a six-mi- crophone system.Finally,the numerical simulation results are verified through experiments in an anechoic cham- ber.It is found that (1) the magnitude bias expands exponentially as frequency increases; (2) the amplitude bia- ses of the two systems are both less than 0.5dB within the range from 0Hz to 4kHz,which means that the systems both meet the accuracy requirements; (3) the tetrahedral microphones system is superior to the six-microphone sys- tem; and (4) the directional bias of six-microphone system is close to 6° at a frequency of 8kHz,while that of tetra- hedral approach is only 1° and increases slowly in the whole frequency domain,which means that the tetrahedral microphones system exhibits higher directional accuracy than the six-microphone system.

Key words: plane wave, three-dimension sound intensity, microphone, sound pressure, numerical simulation, am- plitude bias, directional bias

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