基于COMSOL Multiphysics的目标磁特性仿真分析

摘要

For magnetic field simulation of shell type magnetic targets such as submarine, a multi-model magnetic field simulation method based on COMSOL Multiphysics finite element software is proposed. Firstly, the theoretical value and the simulation value of the magnetic field of hollow sphere model are compared to validate the correctness of the simulation method to solve the magnetic field of shell object, the relative error is better than 1%. Then, a submarine equivalent hollow cylinder model is built to get the size and distribution of the magnetic field through the COMSOL, and the magnetic intensity at 400m is around nT level which is within the detecting precision of the magnetic sensor. Finally, an aircraft model is established above the submarine model in the same coordinate system, and it uses discrete method to achieve the simulation of multi-model magnetic field. The simulation results are basically consistent to that of a single submarine model and the similarity is 95%. This method can provide reference for magnetic target detection and simulation.%针对潜艇等薄壳类磁性目标的磁场仿真问题，提出基于COMSOL Multiphysics有限元软件的多模型磁场仿真方法。首先对比分析空心球体模型磁场的理论计算值和仿真值，相对误差优于1%，验证采用该仿真方法解决薄壳物体磁场的准确性。然后将潜艇等效为空心圆柱体模型，通过COMSOL软件仿真得到其磁场的大小和分布，其中400m处磁场为nT级，在目前磁传感器的探测精度以内。最后在同一坐标系下建立探测飞行模型，包括潜艇和飞机几何体。采用离散取点的仿真方法实现多目标模型磁场的仿真，仿真结果与单潜艇模型下基本一致，相似度达到95%，对磁目标探测仿真具有一定的借鉴意义。