To research the shaft-rate electric field distribution produced by ships' shaft wheeling in shallow sea,based on Maxwell equations theory,this paper deduced the electric field formulas produced by vertical time-harmonic current immersed in four-layer media. With numerical method, the distribution of electric field and the correlation between electric field and conductance of the seabed were analyzed. The result shows that the distribution of all three parts of the electric field is symmetrical, and the longitudinal part has two apexes while the other two parts have only one apex. When the distance between the source and the field point is large,the conductance of seabed has much influence on the intensity obviously. With the conductance of seabed decreasing, the horizontal part of electric field decrease but the vertical part increase.%为了研究舰船螺旋桨转动产生的轴频电场在浅海中的分布规律,在麦克斯韦方程理论基础上推导了四分层媒质中垂直时谐电流在本层导电媒质中产生的电场理论公式,并通过数值方法仿真分析了电场强度三分量的空间分布规律以及与海底电导率的关系。结果表明,电场纵向分量呈双峰对称分布,而横向和垂向分量呈单峰对称分布,当场源距离较大时海底电导率大小对场强影响十分明显,电导率越小水平方向场强越大而垂直方向场强越小。
展开▼
