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基于FFT变换的平面瞬态近场声全息

发表时间:2010-08-15  浏览量:1342  下载量:642
全部作者: 张小正,毕传兴,张永斌,徐亮
作者单位: 合肥工业大学机械与汽车工程学院,噪声振动工程研究所
摘 要: 推导平面瞬态近场声全息(near-field acoustic holography,NAH)的重建公式。平面瞬态近场声全息实际上是在平面稳态近场声全息的基础上增加一维对时间的傅里叶变换,从而对全息面上每一频率所对应的波数谱运用稳态近场声全息的重建公式实现对重建面上波数谱的重建。最后,对求得的所有频率上的波数谱进行反变换,以获得重建面上的瞬态声压。数值仿真证明了基于快速傅氏变换(fast Fourier transform, FFT)的平面瞬态近场声全息的可行性。
关 键 词: 声学;平面瞬态近场声全息;快速傅里叶变换;平面稳态近场声全息;波数谱
Title: Planar transient nearfield acoustical holography based on fast Fourier transform
Author: ZHANG Xiaozheng, BI Chuanxing, ZHANG Yongbin, XU Liang
Organization: Institute of Noise and Vibration, School of Mechanical and Automotive Engineering, Hefei University of Technology
Abstract: The formula for reconstructing the planar transient sound fields from the planar source is deduced in this paper. By adding one dimension of Fourier transform for time to the stationary nearfield acoustical holography, the spectrum of the measured pressure can be obtained corresponding to each frequency, then the pressure spectrum on the source surface can be reconstructed by the spectrum on the measurement surface frequency by frequency, and finally the desired transient pressure on the source surface can be obtained by using inverse transform of the reconstructed spectrum. The numerical simulations prove the feasibility of planar transient nearfield acoustical holography based on fast Fourier transform (FFT).
Key words: acoustics; planar transient nearfield acoustical holography; fast Fourier transform; planar stationary nearfield acoustical holography; spectrum
发表期数: 2010年8月第15期
引用格式: 张小正,毕传兴,张永斌,等. 基于FFT变换的平面瞬态近场声全息[J]. 中国科技论文在线精品论文,2010,3(15):1540-1545.
 
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