舰艇磁场推算中边界元法的改进

摘要

在舰艇磁场推算中.仅需测量磁场垂直分量将更便于工程实现.针对这一需求,推导了边界面为一般柱面条件下边界元方程组的系数矩阵公式,给出了右端项的求法.将磁场的法向导数和标量磁位作了对换.再将磁场垂直分量作为已知的标量看待,使边界条件的获得更为方便.船模实验表明:该改进方法具有更高的推算精度.使用该方法可实现只需舰艇磁场的垂直分量便可准确地进行空间磁场推算的目的.%In the ship＇s magnetic field extrapolation, the mere measurement of the magnetic field vertical component will be helpful for project application. Aiming at this requirement, the coefficient matrix of BEM equations with the cylindrical surface boundary was deduced and the solution of right terms was given. After the normal derivative of the magnetic field was exchanged with the magnetic potential and the vertical component of magnetic field was taken as the known scalar quantity, it was more convenient to solve boundary conditions. The mock-up experiments show that the ship＇s magnetic field can accurately measure only with its vertical component and that the improved method is of high value for application.