A new estimation of the axial shielding factors for multishell cylindrical shields
A new estimation of the axial shielding factors for multishell cylindrical shields
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DOI：
10.1063/1.372579
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发表时间：
2000-05-01
影响因子：
3.2
通讯作者：
Sasada, I
中科院分区：
文献类型：
--
作者：
Paperno, E;Koide, H;Sasada, I
一个新的，更准确的公式描述双壳和多壳轴向磁屏蔽的数值验证现有的估计的结果。使用标准ANSYS（R）软件包。数值模型的参数如下。两个同心的，封闭的圆柱体的厚度相等和恒定的渗透率被认为是。外圆筒的厚径比为t/D-2=1/100，长径比为L-2/D-2=3、4、5，圆筒外径比为D-1/D-2=0.5、0.6、0.7、0.8、0.9，圆筒长度比的范围为L-1/L-2=0.1 ~ 0.9，并且相对磁导率的范围为μ =10（3）-10（6）。发现现有的估计之间以及它们与数值模型之间存在显著的不一致，并对其中一种算法进行了改进以提高其精度。与现有的两种方法相比，新算法的精度有了显着的提高。在新算法的基础上，提出了一个描述多壳层轴向磁屏蔽的新公式。(C)2000年美国物理学会。[S0021-8979（00）82008-3]。
A new, more accurate formula describing double and multiple-shell axial magnetic shielding is obtained as a result of numerical verification of existing estimations. A standard ANSYS (R) software package was used. Parameters of the numerical model are as follows. Two concentric, closed cylinders of equal thickness and constant permeability are considered. The thickness-to-diameter ratio of the outer cylinder is t/D-2=1/100, its length-to-diameter ratio varies as L-2/D-2=3, 4, and 5, the ratio of the cylinders' outer diameters varies as D-1/D-2=0.5, 0.6, 0.7, 0.8, and 0.9, a range of the ratio of the cylinders' lengths is L-1/L-2=0.1-0.9, and a range of the relative permeability is mu =10(3)-10(6). A significant disagreement between the existing estimations and between each of them and the numerical model is found. One of the examined algorithms is modified to improve its precision. A remarkable improvement in the accuracy of the new algorithm compared to both existing methods is achieved. On a basis of the new algorithm, a new formula describing multishell axial magnetic shielding is suggested. (C) 2000 American Institute of Physics. [S0021-8979(00)82008-3].