统计最优平面近场声全息对振动体的定位研究  

Study on Vibrating Objects Localization with Statistically Optimal Planar Near-field Acoustical Holography

作　　者：李卫兵[1] 陈剑[1] 于飞[1] 陈心昭[1] 

机构地区：[1]合肥工业大学机械与汽车工程学院

出　　处：《农业机械学报》2005年第10期101-104,共4页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(项目编号:50275044);教育部科学研究重点项目(项目编号:02126)

摘　　要：基于空间傅里叶变换的平面近场声全息(FFT-based planar NAH)技术对全息面尺寸的要求,在很大程度上限制它的应用范围。为此,引入了统计最优平面近场声全息(SOPNAH)技术,并提出了一种确定波数矢量的新方法。SOPNAH通过全息面上测量声压的线性叠加来反演重建面上的声学量,可以从理论根源上克服FFT-based planar NAH的局限性。实验结果表明,SOPNAH能实现振动体的精确定位及其辐射声场的可视化,并且要求的最小全息面面积比FFT-based planar NAH要小。The application of FFT-based planar near-field acoustical holography （FFT-based planar NAH） is mostly restricted by its required size of holographic plan. The statistically optimal planar near-field acoustical holography （SOPNAH） was introduced, a simple and effective method was proposed to choose the wave number vector. In SOPNAH, the sound pressure at any point on the reconstructed plan was estimated as a linear combination of the measured sound pressure data on holographic plan, so SOPNAH could overcome the above limitations of FFT-based planar NAH. The results of the experiment showed that localization of the vibrating objects and visualization of the sound field radiated by it could efficiently realized by SOPNAH, and the required size of the holographic plan in SOPNAH is smaller than that in the FFT-based planar NAH.

关 键 词：平面近场声全息 振动体定位 波数矢量 

分 类 号：TB532[理学—物理] O421.2[理学—声学]