为分析船舶轴频磁场在空气中的传播特性，把船舶的轴频电流等效为垂直时谐电偶极子，对3层介质中垂直时谐电偶极子在空气层产生的磁场进行求解。借助麦克斯韦方程组和电磁场边界条件建立了垂直时谐电偶极子在空气中矢量磁位的模型，由矢量磁位推导了磁场三分量的表达式，并利用快速汉克尔变换对包含贝塞尔函数积分的磁场进行数值计算。最后，通过碳棒电极在海水水池中的实验，验证了本文的实用性和有效性。
In order to analyze the shaft-rate magnetic field of a ship in air, the shaft-rate current is equivalent to a vertically-directed time-harmonic dipole. In three-layer medium, the magnetic field in air generated by a dipole is derived. First, based on Maxwell's equations and boundary conditions of electromagnetic field, the magnetic vector potential of the dipole is modeled. Then, the magnetic field expressions of the dipole are deduced and a numerical computation is conducted by fast Hankel transform while the expressions contain Bessel integration. At last, the practicalities and validities of the calculation results are proved by contrasting with the carbon electrodes experiment in sea pool.
2019,41(3): 127-130 收稿日期：2017-08-28
DOI：10.3404/j.issn.1672-7649.2019.03.025
分类号：TM153
基金项目：国家自然科学基金资助项目（41374018，41476087）；国家重大科研装备研制项目（ZDYZ2012-1）
作者简介：孙玉绘(1983-),男,博士研究生,主要从事目标磁场测量及信号处理
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