基于磁偶极子的舰船轴频电磁场场源建模与试验验证

摘要

According to the generation mechanism of the underwater corrosion relative shaft⁃rate electromagnetic ( EM) field of ship, magnetic dipole modeling method with the equivalence of current loop and magnetic dipole as a clue is put forward about shaft⁃rate EM field source, simultaneously three kinds of the current loop shape and the calculation methods are given. In salt Lake, the verified experiment results show that:it is feasible that the magnet⁃ic dipole modeling is selected to estimate the underwater shaft⁃rate EM field of ship, comparing with the electric di⁃pole modeling, as seawater is a conductive medium is considered, so the magnetic dipole is more consistent with the experimental results;the results show that the calculation method of the current loop area is feasible. Magnetic dipole modeling reduces the amount of calculation and the measured data at the premise of improving the accuracy, therefore it is more suitable for the research of corrosion relative shaft⁃rate EM field. The typical research results lay the foundation for the further application research.%根据舰艇水下腐蚀相关轴频电磁场的产生机理，提出了以电流环与磁偶极子等效性为线索，对舰艇轴频电磁场场源进行磁偶极子建模，并给出电流环的3种近似形状及环面积的计算方法。在盐湖进行了验证试验，结果表明：将磁偶极子作为对舰艇水下轴频电磁信号进行估算的数学模型是可行的，与电偶极子相比，由于考虑海水为导电媒质的特性，因而与试验结果更加吻合；磁偶极子模型与试验结果的一致性，表明提出的环面积计算方法是可行的。磁偶极子模型在提高模型精度的前提下减少了计算量和实测数据量，因此更适合用于舰船腐蚀相关轴频电磁场的研究。分析所得典型结论为进一步的应用研究奠定了基础。