舰船感应磁场预测的一种新方法

A new method for predicting the induced magnetic field of naval vessels

提出一种基于磁化强度的舰船感应磁场预测法.首先证明了一个基于磁化观点的铁磁物体内部磁场强度计算公式,随后通过该公式导出了点函数去磁张量的概念并证明了它的一些性质,最后利用此公式构造了一个预测非均匀外场中舰船感应磁场的新方法——磁化强度法,且在该方法中用到了点函数去磁张量.与传统的舰船感应磁场预测方法相比,磁化强度法具有计算量小、精度高、物理意义明显等特点.船模数值试验验证了本方法.

A method based on magnetization is proposed to predict the induced magnetic field of naval vessels. We first deduce a formula to calculate the magnetic field in the internal region of magnetized objects from the viewpoint of magnetization, and then use the formula to define the point-function demagnetizing tensor and prove some properties of the tensor. Finally we use this formula to develop a new method to predict the induced magnetic field of naval vessels in a nonuniform applied field, and we call it the Magnetization Method, in which the point-function demagnetizing tensor is used. Compared with traditional methods, the magnetization method features low computational cost, high precision and manifest physical meaning. A numerical simulation of ship model verifies the method.