Please wait a minute...
浙江大学学报(工学版)
J4  2009, Vol. 43 Issue (10): 1808-1811    DOI: 10.3785/j.issn.1008-973X.2009.10.011
    
Nearfield acoustic holography resolution enhancing method based on  interpolation using orthogonal spherical wave source
XU Liang, CHEN Xin-zhao, BI Chuan-xing, CHEN Jian, WANG Hui
(Institute of Sound and Vibration Research, Hefei University of Technology,.Anhui 230009, China)
Download:   PDF(776KB) HTML
Export: BibTeX | EndNote (RIS)      

Abstract  

A new method based on interpolation using orthogonal spherical wave source was proposed to enhance the resolution of the nearfield acoustic holography image without adding measurement points. The interpolation condition is based on measured data, and the interpolation is realized by superposition of a series of spherical wave sources with deferent orders. So acoustic pressure data on hologram surface are increased equivalently, the sampling interval is reduced, information on evanescent waves which lost because of large sampling interval is recovered, and the nearfield acoustic holography image is improved. Numerical simulation shows that the method can efficiently enhance the resolution of the nearfield acoustic holography image.

Published: 29 November 2009
CLC:  TB 532  
Service
E-mail this article
Add to my bookshelf
Add to citation manager
E-mail Alert
RSS
Articles by authors
Cite this article:

XU Liang, CHEN Xin-Zhao, BI Chuan-Xin, et al. Nearfield acoustic holography resolution enhancing method based on  interpolation using orthogonal spherical wave source. J4, 2009, 43(10): 1808-1811.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2009.10.011     OR     http://www.zjujournals.com/eng/Y2009/V43/I10/1808


近场声全息分辨率增强的正交球面波插值方法

为了在不增加测量点数的情况下提高近场声全息图像的空间分辨率,提出一种基于正交球面波插值的近场声全息图像分辨率增强方法.该方法以实际测量点数据为插值条件,通过若干不同阶次的球面波源叠加拟合实际声场,实现全息面插值,从而等效地增加了全息面声压数据,减小了测量间隔,在一定程度上恢复了由于实际测量间隔太大而损失的倏逝波信息,使近场声全息图像空间分辨率得到提高.

［1］ WILLIAMS E G, MAYNAD J D. Holographic imaging without the wavelength resolution limit［J］. Physical Review Letters, 1980, 45: 554560．
［2］ MAYNAD J D, WILLIAMS E G, LEE Y. Nearfield acoustic holography I: theory of generalized holography and development of NAH［J］. Journal of the Acoustical Society of America, 1985, 78(4): 13951413．
［3］ VERONESI W A, MAYNAD J D. Nearfield acoustic holography(NAH) Ⅱ: holographic reconstruction algorithms and computer implementation［J］. Journal of the Acoustical Society of America, 1987, 81(5): 13071322．
［4］ HALD J, GINN K B. Vehicle noise investigation using spatial transformation of sound fields［J］. Sound and Vibration, 1989, 23(4): 3845．
［5］ 徐亮, 毕传兴, 陈心昭, 等. 基于带限信号恢复算法的近场声全息分辨率增强方法［J］. 科学通报, 2008, 53(14): 16321639．
XU Liang, BI Chuan-xing, CHEN Xin-zhao, et al. Resolution enhancement of nearfield acoustic holography by interpolation using band-limited signal restoration method［J］. Chinese Science Bulletin, 2008, 53(14): 16321639．
［6］ HARRIS H C, BLOTTER J D. Obtaining the complex pressure field at the hologram surface for use in near-field acoustical holography when pressure and in-plane velocities are measured［J］. Journal of the Acoustical Society of America, 2006, 119(2): 809816．
［7］ 莫尔斯 P M, 英格特 K U. 理论声学［M］. 北京: 科学出版社, 1984．
［8］ BI Chuan-xing. Orthogonal spherical wave source boundary point method and its application to acoustic holography［J］. Chinese Science Bulletin：English, 2004, 49(16): 17581767．
［9］ WANG, WU S F. Helmholtz equation-least squares method for reconstructing the acoustic pressure field［J］. Journal of the Acoustical Society of America, 1997, 102(4): 20202032.
［10］ MYESS N, WU S F. Experimental validations of the HELS method for reconstructing acoustic radiation from a complex vibrating structure［J］. Journal of the Acoustical Society of America, 2000, 107(6): 29552964．
［11］ ISAKOV, WU S F. On theory and applications of the Helmholtz equation least squares method in inverse acoustics［J］. Inverse Problem, 2002, 18: 11471159．
[1] MAO Jie, HAO Zhi-yong, LU Zhao-gang, CHEN Xin-rui. Sound insulation numerical calculation of an automobile
magnesium alloy dash based on FE-SEA hybrid method[J]. J4, 2012, 46(12): 2184-2188.