宽频带内的单全息面分离声场研究  

The sound field of single holographic surface separation in broadband

作　　者：田湘林[1] 楼京俊[2] TIAN Xiang-lin;LOU Jing-jun(School of Power Engineering,Naval Engineering University,Wuhan 430033,China;Ship Equipment Technical Support Center,Ship and Ocean Engineering College,Naval Engineering University,Wuhan 430033,China)

机构地区：[1]海军工程大学动力工程学院,湖北武汉430033 [2]海军工程大学船舶与海洋工程学院舰船装备技术支援中心,湖北武汉430033

出　　处：《振动工程学报》2019年第1期184-190,共7页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51579245;51579242);国家自然科学基金青年基金资助项目(51509253)

摘　　要：近场声全息能高分辨率地重构声场,但是适用的自由声场环境很难获得,声场分离的方法能虚拟出自由声场,扩大了近场声全息技术的应用范围。目前声场分离的方法需要对声源有较多的先验知识,而且随着分析频率的增加,为了保持重建的精度需要减小传声阵元的间距,造成工程设计制造的难度进一步增加,这些方面一定程度上阻碍了近场声全息技术的应用。文章根据声波等效源法的原理提出一种在较宽的频带内的单全息面分离声场方法,无需目标声源和噪声源的先验知识,即可对声场进行分离,达到虚拟消声的效果。理论推导确保了方法的正确性,数值仿真验证了该方法的可行性和优越性。The sound field can be reconstructed by the near-field acoustic holography with high resolution,but it is difficult to obtain the free sound field environment.The method of sound field separation can virtualize the free sound field and expand the application range of near-field acoustic holography.The current method of sound field separation requires more a priori knowledge of the sound source.Moreover,with the increase of the analysis frequency,it is necessary to reduce the pitch of the microphone element in order to keep the reconstruction precision,which increases the difficulty of engineering design and manufacture. And thus to certain extent hindered the application of near-field acoustic holography.Based on the principle of acoustic equivalent source method,a single holographic surface separation sound field method for a wide frequency band is proposed,for which the acoustic field can be separated without the prior knowledge of the target sound source and noise source.The theoretical derivation ensures the validity of the method,and the numerical simulation verifies the feasibility and superiority of the method.

关 键 词：声场分离 单全息面 等效源法 重采样 宽频 

分 类 号：O422.2[理学—声学] TB525[理学—物理]