摘要
针对多层嵌套、屏蔽墙拼接结构的大型磁屏蔽室在设计建造中存在屏蔽系数计算不确定性的问题,基于磁屏蔽原理分析,提出了屏蔽系数计算不确定性的主要原因是整体导磁率数值参数不准确引起的。采用理论分析与实验的方法,从内层屏蔽墙所处微弱磁场的工作环境和屏蔽墙拼接非连续性而引起的气隙漏磁两方面考虑对整体磁导率数据的影响,分别建立相应样件模型来模拟磁屏蔽墙,构建带屏蔽桶的低干扰测试系统对其测试,得到连续和非连续模型在微弱磁场下的磁导率数据。实验数据表明:当考虑微弱磁场工作环境影响时,屏蔽墙整体磁导率数值比设计使用数值下降了1/2以上;综合考虑工作环境和气隙影响时,屏蔽墙磁导率数值比设计使用数值下降3/4以上。由此可知,在工程中采用相应磁场下屏蔽墙整体磁导率数据比采用理想建造材料的磁导率数据进行屏蔽系数设计更符合实际情况,更加准确,为工程实践和结构设计提供理论依据和实验数据,提高设计可靠性节约建造成本。
Aiming at the uncertainty of shielding coefficient calculation in the design and construction of large magnetic shielding chamber with multi-layer nested and shielding wall splicing structure, Based on the principle of magnetic shielding, the main reason for the uncertainty of calculation of shielding coefficient is that the numerical parameters of the overall permeability are not accurate. Using theoretical analysis and experimental methods, considering the impact on the overall permeability data from the weak magnetic field working environment of the inner shielding wall and the air gap leakage caused by the discontinuity of the shield wall, establishing the corresponding sample model to simulate the magnetic shielding wall, A low-interference test system with a shielded barrel was constructed to test it, permeability data for continuous and discontinuous models under weak magnetic fields were obtained. The experimental data show that: when considering the influence of the weak magnetic field working environment, the overall permeability value of the shielding wall decreases by more than a half compared with the design value;when the influence of working environment and air gap is taken into account, the magnetic permeability of shield wall decreases more than three quarters compared with that of design. It can be seen that the overall permeability data of the shielding wall under the corresponding magnetic field in the project is more accurate and more in line with the actual situation than the magnetic permeability of the ideal building material, It provides theoretical basis and experimental data for engineering practice and structural design, and improves design reliability to save construction cost.
作者
胡瑞雪
韩雪艳
赵占良
赵飞
李仕华
HU Ruixue;HAN Xueyan;ZHAO Zhanliang;ZHAO Fei;LI Shihua(Hebei Jiaotong Vocational & Technical College,Shijiazhuang,Hebei 050035,China;School of Mechanical Engineering,Yanshan University,Qinhuangdao,Hebei 066004,China;Hebei Electromagnetic Environment Engineering Technology Research Center,Shijiazhuang,Hebei 052160,China)
出处
《燕山大学学报》
CAS
北大核心
2019年第5期401-407,共7页
Journal of Yanshan University
基金
国家自然科学基金资助项目(51775475)
河北省自然科学基金重点资助项目(E2016203463)
关键词
磁屏蔽
屏蔽系数
B-H
曲线
整体磁导率
气隙
magnetic shielding
shielding coefficient
B-H curve
overall magnetic permeability
air gap
