Choice of parameters for passive shielding of power-frequency magnetic fields |
| |
Authors: | Ener Salinas Marina Rezinkina |
| |
Institution: | (1) Faculty of Engineering, Science and The Built Environment, London South Bank University, 103 Borough Road, London, SE1 0AA, UK;(2) Science and Technology Center of Magnetism of Technical Objects, The Ukrainian National Academy of Sciences, Industrialnaja St. 19, 61106 Kharkov, Ukraine |
| |
Abstract: | Epidemiological studies suggesting the possibility of harmful effects on human (specifically children’s leukaemia) due to
long-term exposure to magnetic fields of extremely low frequency (e.g. 50/60 Hz) and relatively low values (i.e. over the
microtesla range) have stirred high activity in the topic of magnetic field mitigation. To reduce these fields, it is common
to use passive metal screens (e.g. plates made of aluminium or steel). To design them, effective and fast numerical computations
are highly desirable. In this article, a method is presented, which computes various parameters of screens in a given shielding
problem and yields magnetic field distribution and shielding factors. The method takes into consideration the 3D field distribution
and is able to solve systems with large aspect ratios (thin thickness in comparison with its other dimensions); this is a
common problem where other methods such as finite elements often experience difficulties. The presented method computes separately
the field inside and outside the screens. Afterwards, the solutions are “stitched” together along the border of the subregions.
Two practical examples are given of the developed numerical method. |
| |
Keywords: | Extremely low magnetic fields Passive shielding Absorbing boundary conditions Eddy currents |
本文献已被 SpringerLink 等数据库收录! |
|