基于巴特沃斯滤波器的近场声全息滤波方法  

Near-field acoustic holography filtering method based on Butterworth filter

作　　者：卢锦芳 楼京俊[2] 刘树勇[1] 毛为民 LU Jin-fang;LOU Jing-jun;LIU Shu-yong;MAO Wei-min(College of Power Engineering,Naval University of Engineering,Wuhan 430033,China;College of Naval Architecture and Ocean Engineering,Naval University of Engineering,Wuhan 430033,China;No.91007 Unit of PLA Liberation Army,Zhoushan 316000,China)

机构地区：[1]海军工程大学动力工程学院,湖北武汉430033 [2]海军工程大学舰船与海洋学院,湖北武汉430033 [3]中国人民解放军91007部队,浙江舟山316000

出　　处：《舰船科学技术》2023年第24期160-165,共6页Ship Science and Technology

基　　金：湖北省自然科学基金面上项目(2022CFB405);国家自然科学基金青年科学基金资助项目(52201389)。

摘　　要：针对近场声全息研究中声场重构时,指数滤波器无法兼顾通带衰减率和高频带衰减率的局限性,采用巴特沃斯滤波器作为滤波函数以消除噪声干扰,对2个同向振动的脉动球源的重构声场进行仿真研究,给出巴特沃斯滤波器随参数变化的特性曲线。基于重构误差最小原则,给出该滤波器的最优参数,并与指数滤波器效果进行对比。结果表明,巴特沃斯滤波器可在声场重构过程中进行有效滤波,且在高频段,巴特沃斯滤波器重建误差明显小于指数滤波器重建误差,滤波效果更好,重建精度更高。In view of the limitation that the exponential filter cannot take into account both passband attenuation rate and high frequency attenuation rate when the sound field is reconstructed in the study of near-field acoustic holography,Butterworth filter is adopted as the filter function to eliminate the noise.The reconstructed sound field of two pulsating spherical sources with the same direction of vibration is simulated.The characteristic curve of Butterworth filter changing with the parameters is given.Based on the principle of minimum reconstruction error,the optimal parameters of the filter are given,and the filtering effect is compared with that of the exponential filter.The results show that Butterworth filter can effectively filter in the process of sound field reconstruction,and the reconstruction error of Butterworth filter is significantly smaller than that of exponential filter in high frequency band and its filtering effect is better and the reconstruction accuracy is higher.

关 键 词：近场声全息 波数域滤波 巴特沃斯滤波器 指数滤波器 

分 类 号：TB532[理学—物理]