声波式机械天线的谐振频率调控方法  

Resonant frequency control method of acoustic mechanical antenna

作　　者：崔勇[1] 李良亚 王琛[1] 黄玉平[2] 袁志鸿 陶云飞 CUI Yong;LI Liangya;WANG Chen;HUANG Yuping;YUAN Zhihong;TAO Yunfei(School of Automation Science and Electrical Engineering,Beihang University,Beijing 100191,China;Beijing Institute of Precision Mechatronics and Controls,Beijing 100076,China)

机构地区：[1]北京航空航天大学自动化科学与电气工程学院,北京100191 [2]北京精密机电控制设备研究所,北京100076

出　　处：《国防科技大学学报》2024年第4期96-103,共8页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(51707006)。

摘　　要：声波式机械天线作为机械天线的重要类型之一,其谐振频率与固有频率高度耦合,而目前声波式机械天线受到材料尺寸限制,谐振频率较高,无法满足甚低频或更低频段的需求。为调控声波式机械天线的谐振频率,对声波式机械天线进行了振动建模,提出了增加单边固定约束、增加自由端质量和去除天线部分材料三种方法,并通过有限元仿真对所提方法进行了验证。结果表明,三种方法均能有效调控声波式机械天线的谐振频率,且与解析模型具有良好的一致性。通过应力分布研究了三种调控谐振频率方法对天线辐射的电场强度或磁场强度的影响,对声波式机械天线的设计具有重要参考意义。Acoustic mechanical antenna is one of the important types of mechanical antenna,the resonant frequency of acoustic mechanical antenna is highly coupled with its natural frequency.However,the current acoustic mechanical antenna is limited by material size and has high resonant frequency,which can not to meet the needs of very low frequency or lower frequency band.In order to control the resonant frequency of acoustic mechanical antenna,the vibration modeling of acoustic mechanical antenna was carried out.Three methods were proposed:adding unilateral fixed constraint,increasing free end mass and removing some materials of antenna.Proposed method was verified by finite element simulation.Results show that the three methods can effectively control the resonant frequency of acoustic mechanical antenna,and are in good agreement with the analytical model.Influence of three methods of regulating resonant frequency on the electric field or magnetic field intensity radiated by the antenna was studied through the stress distribution,which has important reference significance for the design of acoustic mechanical antenna.

关 键 词：声波式机械天线 甚低频 固有频率 有限元 磁电复合材料 

分 类 号：TN822.1[电子电信—信息与通信工程]