水下铁磁体近场地磁磁异常的有限元分析  

Finite Element Analysis of Magnetic Anomalies of Near-Field Terrestrial Magnetism of Underwater Ferromagnets

作　　者：田斌[1] 明勇 陈义中 杨超 TIAN Bin;MING Yong;CHEN Yizhong;YANG Chao(School of Electrical and Information Engineering,Wuhan Institute of Technology,Wuhan 430205,China;Research and Design Institute,Wuhan Institute of Technology,Wuhan 430073,China)

机构地区：[1]武汉工程大学电气信息学院,湖北武汉430205 [2]武汉工程大学研究设计院,湖北武汉430073

出　　处：《武汉工程大学学报》2023年第2期201-207,共7页Journal of Wuhan Institute of Technology

基　　金：国家自然科学基金(62171329,61671337)。

摘　　要：考虑铁磁体的几何特征与去磁效应,将空间磁场对铁磁体磁化产生的感生磁场等效为薄层直流电环磁场,并用积分方程法推导出磁场中各个点的磁场矢量强度,获得了磁异常检测简化模型,并进一步利用有限元仿真分析了该磁异常场空间分布规律。最后验证了该模型的有效性。结果表明:可以通过圆柱铁磁体退磁系数、相对磁导率和空间磁化磁场大小计算等效薄层电流环的电流方向和大小,为水下圆柱铁磁体的近场地磁磁异常探测建模与分析提供了一种新方法。Given that the geometric characteristics and demagnetization effect of ferromagnets,the induced magnetic field generated by the spatial magnetic field of the ferromagnet was equivalent to the magnetic field of the thin direct current ring,and the magnetic field vector intensity of each point in the magnetic field was derived by the integral equation method.A simplified model of magnetic anomaly detection was obtained,and the spatial distribution of the magnetic anomaly field was further analyzed by finite element simulation.Finally,the validity of the model was verified.The results show that the current direction and magnitude of equivalent thin layer current loop can be calculated by the demagnetization coefficient,relative permeability and spatial magnetic field size of cylindrical ferromagnet,which provides a new method for modeling and analysis of near-field geomagnetic magnetic anomaly detection of underwater cylindricalferromagnet.

关 键 词：磁异常 地磁 积分方程法 有限元仿真 

分 类 号：P318.63[天文地球—固体地球物理学]