由空中磁场推算线电极参数及海水中电磁场分布  

Calculation of Line-electrode Parameters and Electromagnetic Field Distribution in Seawater from Magnetic Field in Air

作　　者：文无敌 刘忠乐[1] 李华[1] 

机构地区：[1]海军工程大学兵器工程系,湖北武汉430033

出　　处：《兵工学报》2013年第11期1412-1417,共6页Acta Armamentarii

基　　金：国防预先研究项目(4010604020302)

摘　　要：海水中的线电极可作为舰船电磁场的模拟场源,然而在海水中测量其电磁场操作实施困难,如果能够通过空中的磁场测量来推算线电极在海水中的电磁场分布则能很好地解决这一难题。根据海水中稳恒电流电场的点电极计算模型,推导出线电极在海水中的电场、磁场和空中磁场分布的解析表达式,从而提出通过测量空中磁场分布来推算海水中线电极的参数及其在海水中电场和磁场分布。设计了实验室水池测量方案,运用遗传算法(GA)对线电极参数及电缆有效段进行GA编码,计算结果符合实际;由GA计算结果进一步求得海水中电磁场的分布,与理论值达到很好的吻合,证明了方法的可行性。Line-electrode can be used as a source to simulate ship＇ electric and magnetic fields. However, it is difficult to measure the electromagnetic field of line-electrode in the seawater. The issue can be solved if the distribution of its electromagnetic field in the seawater can be calculated by measuring its electromagnetic field in the air. According to the calculation model of point-electrode in the seawater under the condition of electric field of steady current, the analytic expressions of electric and magnetic fields of line-electrode in the seawater and its magnetic field in air are derived, thereby proposing a method to reckon the parameters of line-electrode and the distribution of its magnetic and electric field in the seawater by using the distribution of measured magnetic field in air. A scheme Of experiment under the laboratory pool condition is designed, and the genetic algorithm is used to code the parameters of line-electrode and the effective section of cable. The calculated result is in agreement with the actual result. The distributions of electric and magnetic fields in the pool are obtained from the measured result, which are close to the theoretical values.

关 键 词：电磁学 线电极 介质模型 镜像法 

分 类 号：TU352.11[建筑科学—结构工程]