磁屏蔽装置与磁场模拟器的耦合分析

Coupling analysis between magnetic shielding device and magnetic field simulator

地磁导航半实物仿真是地磁导航从理论走向工程应用的关键环节,而地磁场环境仿真技术是地磁导航由计算机仿真过渡到半实物仿真的桥梁。针对地磁场环境仿真系统中磁屏蔽装置与其内部磁场模拟器的耦合问题,采用仿真分析与实验验证相结合的方法,利用Ansoft Maxwell仿真软件设计仿真实验对二者的耦合关系进行了探索性研究,并基于小型地磁场环境仿真系统对仿真得到的结论进行了实验验证。仿真和实验结果均表明:磁场模拟器在大电流强磁场的工作情况下会对磁屏蔽装置造成严重的磁化,进而会影响其屏蔽效果;磁屏蔽装置不会影响磁场模拟器的线性度和均匀性,但是会增大轴线中心点附近的磁场值;磁屏蔽装置会使磁场模拟器的电感增大,从而使实时性变差。研究结论可以为地磁场环境仿真系统的设计提供理论依据。

The hardware in the loop simulation of geomagnetic navigation is the key link for the geomagnetic navigation from theory to engineering,and the technology of geomagnetic field environment simulation is the bridge between the computer simulation and the hardware in the loop simulation. Aimed at the coupling problem of the magnetic shielding device and the magnetic field simulator in the magnetic environment simulation system,the method of simulation analysis and experimental verification is adopted. First,simulation experiments are designed to explore the coupling relationship between the magnetic shielding device and the magnetic field simulator by the Ansoft Maxwell software. Then,a small geomagnetic field environment simulation system is established,including solenoid coil and magnetic shielding canister. Based on this system,the simulation results are verified by experiments. The simulation and experimental results show that the magnetic field simulator will cause serious magnetization on the magnetic shielding device under the condition of high current and strong magnetic field,which will affect the shielding effect. The linearity and uniformity of magnetic field simulator will not be affected by the magnetic shielding device,but the magnetic field of the axis center will increase. The magnetic shielding device can make the inductance of the magnetic field simulator increase,so that the real-time property becomes worse. The conclusions obtained in this paper can provide theoretical basis for the design of geomagnetic field environment simulation system.