针对电枢发射过程的速度趋肤效应影响磁场分布和导磁材料磁饱和特性的问题,在轨道炮面电流模型基础上提出单层导电材料、单层导磁材料、三层组合屏蔽方案以及考虑屏蔽体相对弹底距离及屏蔽体壁厚的优化方案。该屏蔽方案利用导电材料的涡流消除机理和导磁材料的磁通分流机理可以有效屏蔽磁场从而保护引信内部电子器件。仿真结果表明,在距离弹底2倍导轨间距位置处,3 mm厚的低碳钢铜 Mumetal 的组合屏蔽体具有最优屏蔽效能,屏蔽前后考察面平均磁通密度峰值分别为0.224 T 和0.0115 T,屏蔽效能达到25.79 dB；在距离屏蔽体底面9 mm距离内,屏蔽效能不低于29 dB。%Aiming at the problem that velocity skin effect impacts the magnetic field distribution during arma-ture launching process and the magnetic saturation characteristic of high permeability materials,single-layer shield with high conductivity material or high permeability material,multi-layer combined shield and other opti-mization schemes considering the relative distance of shielding from the bottom of proj ectile and the shield thick-ness was proposed based on the surface current model of rail-gun.The shielding schemes utilized the eddy cur-rent eliminating mechanism of high conductivity material and the magnetic flux splitting mechanism of high per-meability material to effectively shield the magnetic field and protect the internal electronic device of the fuze. Simulation results showed that,at two calibers from the bottom of the proj ectile,with 3 mm thick,the low car-bon steel-copper-Mumetal combined shield showed the optimal shielding effectiveness.The average peak flux density of the surface before shielding and after shielding was 0.224 T and 0.0115 T.The shielding effective-ness was 25.79 dB,and the shielding effectiveness was 29 dB within a distance of 9 mm from the bottom of the shield.
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