The shielding property of cylinder with circular, square, and equilateral triangle holes was investigated by finite element analysis (FEA). The hole area (S _hole) plays an important role in magnetic circuit on the surface of cylinder. When S _hole is less than the critical area (S _H), cylinder with three shapes of holes obtained the same remanent magnetization inside, indicating that the shielding property is unaffected by the shape of the hole. Hence, high-permeability material is the major path of the magnetic field. On the condition of S _hole > S _H, the sequence of the shielding property is equilateral triangle > square > circular, resulting from magnetoresistance of leakage flux in air dielectric. Besides, the anisotropy of shielding property caused by hole structural differences of the cylinder is evaluated. We find that a good shielding effectiveness is gained in the radial direction, compared with the axis direction. This research focuses on providing a theoretical support for the design of magnetic shield and improvement on the magnetic shielding ability.

通过有限元分析(FEA)研究了圆形、方形和等边三角形孔圆柱体的屏蔽性能。孔区（S _孔）在圆柱体表面的磁路中起重要作用。当S _孔小于临界面积（S _H）时，具有三种孔形状的圆柱体内部获得相同的剩磁，说明屏蔽性能不受孔形状的影响。因此，高磁导率材料是磁场的主要路径。在S _孔> S _H的条件下，屏蔽特性的顺序是等边三角形>正方形>圆形，这是由空气介质中漏磁通的磁阻引起的。此外，还评估了由圆柱体孔结构差异引起的屏蔽性能的各向异性。我们发现与轴向相比，径向获得了良好的屏蔽效果。本研究的重点是为磁屏蔽设计和磁屏蔽能力的提高提供理论支持。