【摘要】 在分析了对几种不同电流源产生的磁场进行屏蔽的机理的基础上,讨论了单电流产生的磁场的有效屏蔽方法。通过理论推导、边界元数值计算和试验验证表明,两端用低阻抗连接或者良好接地的金属管才能有效地屏蔽单电流产生的磁场,不接地或单端接地的金属管对于这种磁场没有屏蔽作用。更多还原

【Abstract】 This pa pe r presents the effective shielding design for magnetic fields generated by unidi rectional current based on the analysis of the shielding effectiveness of severa l kinds of current sources.Theoretical formulas and numerical computation softwa re based on the boundary element method are employed to find the effective shiel ding solution.It is shown that ungrounded cylindrical metallic tube has no shiel ding effectiveness for unidirectional current.Effective shielding can be reached by connecting the two ends of the tube with low impedance connector,or alternat ively,grounding the two ends.Experiments are also carried out,and the result s upports this conclusion.更多还原