大型零磁装置屏蔽系数的计算方法  

Calculation Method of the Shielding Factor for Large-Scale Zero Magnetic Field Facility

作　　者：孙芝茵[1] 李立毅[1] 潘东华[1] 刘添豪 Peter Ferlinger Sun Zhiyin;Li Liyi;Pan Donghua;Liu Tianhao;Peter Ferlinger(Laboratory for Space Environment and Physical Sciences Harbin Institute of Technology Harbin 150001 China;School of Electrical Engineering and Automation Harbin Institute of Technology Harbin 150001 China;Department of Physics Technische Universit鋞 M黱chen M黱chen D-85748 Germany)

机构地区：[1]哈尔滨工业大学空间基础科学研究中心,哈尔滨150001 [2]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001 [3]慕尼黑工业大学物理系,慕尼黑D-85748

出　　处：《电工技术学报》2018年第19期4450-4457,共8页Transactions of China Electrotechnical Society

基　　金：中德博士后交流项目资助(ZD2017012)。

摘　　要：零磁装置屏蔽外界磁场以实现极端微弱磁场环境,由于其边角、孔洞、缝隙等非理想因素,屏蔽特性难以准确预估。大型零磁装置整体尺寸在米级,而屏蔽材料的厚度只有毫米级,采用常规有限元方法将不可避免地遇到剖分问题。该文提出针对静态磁场屏蔽和交变磁场屏蔽的改进有限元计算方法,采用两种薄层等效边界条件计算屏蔽层内外的磁场变化。通过与理想屏蔽体的理论分析结果进行对比,验证了该等效边界的有效性。基于该方法可进行多层屏蔽的优化设计、分析孔洞对屏蔽系数的影响规律。结合德国慕尼黑工业大学最新建设的零磁装置,通过屏蔽系数的测量实验,验证了该计算方法的有效性。For the facility to realize the nearly zero magnetic field,the shielding factor is hard to predicted accurately because of imperfect factors including edges,holes and airgaps,etc.A largescale facility is composed of permalloy sheets with widths of a few meters and thicknesses of a few millimeters,and hence brings a challenge to meshing in finite element method(FEM)model.In this paper,the improved FEM methods are presented for shields in both DC field and AC field,using two types of interior boundaries to calculate the field changes because of the shield.It is demonstrated by the comparison with theoretical analysis of ideal shields.On the base of the improved FEM methods,the multilayer shield can be optimized efficiently and the influences of holes on the shielding factor can be analyzed.The presented calculation methods are applied to the new built magnetic shielded room(MSR)in technische universit?t München(TUM)and verified by the shielding factors measurement.

关 键 词：近零磁场 微弱磁场 磁屏蔽 屏蔽系数 

分 类 号：TM15[电气工程—电工理论与新技术]