基于混合模型的舰船腐蚀相关静态电、磁场

Corrosion related static electric and magnetic field of ships based on mixed modeling

为研究舰船水下腐蚀相关静态电场、磁场的分布特征,提出了以舰船水下标量电位为线索,对舰船进行混合建模,即将舰船等效为水平电流线和离散三分量电偶极子的组合,通过测量舰船下方某平面上的标量电位分布,对混合模型中的未知结构参量进行拟合,以建好的混合模型为基础对舰船水下腐蚀相关静态电、磁场进行研究.在实验室中模拟海洋环境,利用1∶100船模对建模方法进行了验证,并以建好的混合模型为基础,计算了船模水下腐蚀相关静态电、磁场的分布特征.实验结果表明混合模型结构简洁、实测数据量小、建模计算量小、模型稳定,比较适合用于舰船腐蚀相关静态电、磁场分布特点的研究.

Mixed modeling method with underwater electric potential as a clue is put forward in order to research the distribution characteristics of corrosion related static electric and magnetic fields of a ship, that is to regard a ship as a combination of horizontal current line and several discrete dipoles. The unknown parameters of the mixed model can be found out by fitting the measuring data of the underwater electric potential in a plane under the ship. Then the characteristics of corrosion related static electric and magnetic fields underwater can be studied based on the mixed model. The ocean environment has been simulated in laboratory, then the method of mixed modeling has been validated by experiments using a 1：100 physical scale model of a ship, then the distribution of corrosion related static electric and magnetic fields of the ship model has been calculated based on the built mixed model. The experimental results show that the mixed modeling has advantages of less unknown parameters, easier actual measurement, less calculation and more stabilization.