• CN:11-2187/TH
  • ISSN:0577-6686

›› 2004, Vol. 40 ›› Issue (2): 112-116.

• 论文 • 上一篇    下一篇

单全息面分离声场技术及其在声全息中的应用

于飞;陈心昭;陈剑   

  1. 合肥工业大学动态测试中心
  • 发布日期:2004-02-15

SOUND FIELD SEPARATION TECHNIQUE WITH SINLGE HOLOGRAPHIC PLANE AND ITS APPLICATION IN ACOUSTIC HOLOGRAPHY

Yu Fei;Chen Xinzhao;Chen Jian   

  1. Hefei University of Technology
  • Published:2004-02-15

摘要: 提出单全息面分离声场技术,突破以往近场声全息(NAH)和基于声强测量的宽带声全息(BAHIM)的应用局限。它们的局限在于:全息面一侧的声场必须是自由声场,即要求所有的声源仅能位于全息面的另一侧;而在工业测量的情况下,这个要求是很难达到的。提出的声场分离技术,利用全息面上微粒法向振速的叠加原理和波数域的Euler公式,建立起在波数域内的声场分离公式,然后通过二维逆Fourier变换,便得到了全息面一侧声源所产生的声压,从而达到声场分离的目的。原理的推导理论上论证该技术正确性,数值仿真显示了该技术的可行性和有效性。

关键词: 单全息面, 分离声场, 声全息, 声源识别

Abstract: Sound field separation technique with single holographic plane is proposed, which breaks the limitations of near-field acoustic holography (NAH) and broadband acoustic holography from intensity measurement (BAHIM). The limitation of them is: sound field on one side of holographic plane must be free field, that is to say all the sound sources must confine to the other side; but it is not easily to access on industrial measurements. The technique proposed builds the sound field separation formula in wave number domain according to the superposition of particle velocity theorem and Euler equation in wave number domain, then the sound pressure caused by sources on one side of holographic plane can be obtained as expected by taking inverse two-dimensional Fourier transform of this formula. The derivation of the principle shows the correctness of the technique, and the numerical simulations demonstrate its feasibility and effecti- veness.

Key words: Acoustic holography, Noise sources identification, Single holographic plane, Sound field separation

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