对船舶大轴电流的检测研究

On Measurement of Electric Current of Ship's Axis

船舶大轴电流是产生船舶静电场分布的主要原因 ,文中提出通过测量大轴电流周围的磁场分布从而推算大轴电流的方法 .在实验室中模拟大轴电流 ,自制专用的磁性换能器 ,在磁芯充分饱和的条件下 ,通过提取输出信号中的二次谐波来获得船舶大轴周围磁场数据 ,再由此推算出大轴电流 .实验结果表明该方法结构简单、测量可靠 .

Electric current of ship's axis is the primary causation of the static electric field of ships. In this paper, a new method to get the electric current of ship's axis has been put forward, that is, to calculate the current from the distribution of the magnetic field nearby the axis. And the current of ship's axis has been simulated in lab, energy exchanger has also been made, then the way of SHG has been used to pick up the magnetic field around the axis under the condition that magnetic core is fully saturated. Then the current can be got through some calculation. Experiments show that this method is simple structured and can provide precise measure. The study of the electric current can provide a new way to analyze the static electric field around the ship.