基于声辐射模态的双面Patch近场声全息技术  

Double-layer Patch near-field acoustic holography based on acoustic radiation modes

作　　者：郭亮[1] 朱海潮[1] 毛荣富[1] 

机构地区：[1]海军工程大学船舶振动噪声重点实验室,武汉430033

出　　处：《海军工程大学学报》2015年第5期25-29,共5页Journal of Naval University of Engineering

基　　金：国家自然科学基金资助项目(51305452)

摘　　要：针对近场声全息技术在应用过程中遇到的外界干扰和测量孔径效应的双重问题,提出了基于源强密度声辐射模态理论的双面Patch近场声全息技术。经过理论分析和公式推导,建立了由声辐射模态叠加表达的声场声压数学模型。首先,采用双面声场分离技术清除测量面背向干扰源的影响;然后,对分离数据进行内插与外推,等效增加声源在全息面处的声压数据,减小了测量间隔;最后,获得了声源在非自由声场环境下具有高空间分辨率的全息图像。与传统的分离方法和Patch技术相比,所提方法综合考虑了相关参数的优化选择与控制,便于应用与推广。为了验证该方法,在理论工作的基础上,以刚性脉动球为对象进行了仿真研究,以音箱为对象进行了试验测试,相关结果证明了该方法的有效性与正确性。To solve the twin problems of external interference and measuring aperture effect in the application of near-field acoustic holography,the double-layer Patch near-field acoustic holography based on source strength density acoustic radiation modes is proposed.Through the theoretical analysis and formula derivation,a mathematical model of sound pressure is set up by superposing the acoustic radiation modes.Firstly,the interference caused by the disturbing noise is eliminated by using the sound field separation technique with double pressure measurement layers.Then,the separated data is interpolated and extrapolated to increase the sound pressure data on the holographic plane equivalently,which means the measurement interval becomes smaller.Finally,the holographic image with high spatial resolution that is generated by the target source in the non-free field can be obtained.Compared with the conventional sound field separation and Patch techniques,the optimal selection and control of all the related parameters based on comprehensive consideration is easy to apply and popularize.The simulation analysis of rigid pulsating balls and the experiment on two loudspeakers prove the proposed method to be correct and effective.

关 键 词：源强密度声辐射模态 双面声场分离 Patch技术 近场声全息 

分 类 号：TB52[理学—物理]