An analysis of the use of magnetic source tomography to measure the spatial distribution of electric current during vacuum arc remelting
An analysis of the use of magnetic source tomography to measure the spatial distribution of electric current during vacuum arc remelting
复制标题
DOI：
10.1088/0957-0233/20/4/045701
复制
发表时间：
2009-04
影响因子：
2.4
通讯作者：
B. Nair;R. M. Ward
中科院分区：
文献类型：
--
作者：
B. Nair;R. M. Ward
利用磁源层析成像技术分析了真空电弧重熔过程中的电流分布。目标是使用过程外部的传感器来推断内部的行为。使用商用有限元电磁代码（Opera 3d）对具有电弧电流的非轴对称分布的VAR系统进行建模，并且从预测在坩埚外部发生的磁通量的所得图案创建数据库。提出了一种基于约束非线性优化的电弧电流重构算法，利用外部磁场数据估计电弧电流在过程中的分布。该算法的能力进行了研究，它被发现，在测量数据中给出足够低的噪声，它是可以准确地推导出的电弧电流的空间分布的重要特征。
Magnetic source tomography is explored to analyse the distribution of electric current during vacuum arc remelting (VAR). The goal is to use sensors outside the process to deduce the behaviour within. VAR systems having non-axisymmetric distributions of arc current were modelled using a commercial finite element electromagnetic code (Opera 3d), and a database was created from the resulting patterns of magnetic flux predicted to occur outside the crucible. A reconstruction algorithm was developed using constrained nonlinear optimization to estimate the arc current distribution within the process from the magnetic field data outside. The capabilities of this algorithm were studied, and it was found that given sufficiently low noise in the measurement data it was possible to accurately deduce important features of the spatial distribution of the arc current.