铁磁性舰船壳体对低频磁场屏蔽作用研究  

Research on the shielding effect of ferromaghetic ship on low-frequercy magnetic fields

作　　者：李国栋 刘琪 姜润翔 LI Guo-dong;LIU Qi;JIANG Run-xiang(College of Electrical Engineering,Naval University of Engineering,Hubei 430033,China)

机构地区：[1]海军工程大学电气工程学院,湖北武汉430033

出　　处：《舰船科学技术》2023年第20期62-66,共5页Ship Science and Technology

摘　　要：磁性材料的轴旋转时,将引起周围空间低频磁异常,该信号的频率低,线谱特征明显成为新的可探测源。由于船壳材料为磁性良导体,对电磁场具有一定屏蔽作用,为了实现对磁性源产生的轴频电磁场进行准确建模,需要考虑舰船壳体自身的磁场屏蔽作用。因此,本文构建有限元仿真模型,对不同频率下的磁屏蔽系数进行仿真计算,并进行试验验证。分析结果表明:对于同一舰船壳体而言,磁屏蔽系数随着频率的增加而减小。1 Hz对应的屏蔽系数在0.6~0.7之间,5 Hz对应的屏蔽系数在0.2~0.3之间,10 Hz对应的屏蔽系数约为0.1,为磁性源产生的轴频电磁场的准确建模打下理论基础。In order to achieve the shaft frequency electromagnetic field in magnetic source for accurate modeling,to consider ship body own magnetic field shielding effect,therefore,in this paper,based on the theoretical calculation of the magnetic shielding factor,builds the finite element simulation model of the magnetic shielding coefficient under different frequency simulation calculation,and finally to test.The analysis results show that for the same ship shell,the magnetic shielding coefficient decreases with the increase of frequency.The shielding coefficient corresponding to 1 Hz is between 0.6 and 0.7,the shielding coefficient corresponding to 5 Hz is between 0.2 and 0.3,and the shielding coefficient corresponding to 10Hz is about 0.1,which lays a theoretical foundation for the accurate modeling of the axial frequency electromagnetic field generated by the magnetic source.

关 键 词：轴频磁场 磁屏蔽 舰船 

分 类 号：U674.7[交通运输工程—船舶及航道工程]