有外回路的金属管屏蔽单电流磁场源的电路法解析

Circuit Approach Solution for Magnetic Shielding by Cylindrical Shells Against a Unidirectional Current Source

有外回路的金属管能有效屏蔽单电流磁场源,但屏蔽效果的计算要用数值方法,不便于应用.本文提出用电路法求解其屏蔽效能,推导了电路参数,给出了便捷的磁场和屏蔽效果解析计算式,并用边界元法计算软件和实验测量方法进行了验证.最后,给出了工程应用的实例.

Metallic cylindrical shell with external loop can effectively shield the magnetic field excited by a unidirectional current. The shielding effectiveness is usually evaluated by numerical method, which is not convenient for application.A circuit approach was employed to derive the shielding effectiveness of the metallic shell with external loop. Close-form expressions of the circuit parameters and easy-to-use formula for the calculation of shielding effectiveness were given. The effectiveness of the derived ...