水下铁磁性腔体外部感应磁场研究

在水下铁磁性腔体上测量地磁场必须消除干扰磁场的影响,其中感应磁场是干扰磁场的主要组成部分,它随着腔体方位的变化而变化。分析腔体感应磁场的有限元计算方法,建立二维、三维数学模型,重点是采用有限元积分法添加了Neumann边界条件,得到了腔体感应磁场方程。通过将二维模型的解析解与数值解相比对,验证了二维和三维感应磁场方程的正确性,从而运用数值计算方法得到腔体位置、姿态变化时感应磁场的分布。

Research of Inductive Magnetic Field Around Large Ferromagnetic Cavities

Measurements of the geomagnetic field on the ferromagnetic cavity underwater must eliminate the effects of magnetic interference,magnetic field sensor is a major component of the magnetic interference,It changes with the cavity orientation.This paper analyzes the finite element method based on cavity magnetic field,establishment of a two-dimensional, three-dimensional mathematical model, use the integral method to add Neumann boundary condition,get cavity induced magnetic field equation.Compared analytical solutions with numerical solutions of a two-dimensional model,verify the correctness of two-dimensional and three-dimensional magnetic induction equation,when the cavity position, attitude change get cavityinduced magnetic field distribution by using numerical methods.