Simulation of geomagnetic anomaly of underwater vehicle based on finite element method
To overcome the difficulties of obtaining the magnetic anomaly data of underwater vehicles and the low calculation precision of existing magnet simulation models,a high-precision hybrid analytical model suitable in both near-field and far-field based on finite element method is introduced.The spatial signature of magnetic anomaly of an underwater vehicle with complex structure is analyzed by the finite element method.Then,an analytical model combined with uniformly-magnetized spheroid and a dipole array is proposed with the numerical results as the convergence goal.This analytical model consists of several parameters,including the number of array elements,the positions of each element,and magnetic moments,which are solved by nonlinear least-square algorithm.The simulation results show that the magnetic anomaly calculated from this model has good consistencies with the numerical solution in full space,giving an average error of 3％at the measurement plane.This model could be potentially extended to applications like magnetic field continuation and high-precision modeling.
airborne magnetic anomaly detectionfinite element method(FEM)magnet simulationnumerical fitting
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