舰船轴频电场衰减规律的实验验证

Experimental validation about attenuation law of the vessel's shaft rate electric field

舰船电场的轴频信号分布在1～7 Hz,且存在明显的谐波成分,因此其在浅海环境中能传播较远距离,从而成为舰船的特征信号之一。本文基于时谐电偶极子模型,在海上测试了电场信号源的衰减规律。通过对试验数据的分析可知,水深为16 m时,1.06 Hz,1.94 Hz以及3.22 Hz交变电场纵向分量在海底平面沿纵向随距离分别呈1.91次方、1.91次方和1.88次方衰减,很好地验证了理论数值计算的正确性。

The shaft rate electric signal of vessel distributes in 1-7 Hz, it has obvious harmonic wave, and its propagation distance is very long in the shallow water,so it is looked as a characteristic signal of the vessel. In this paper, based on the time-harmonic electric dipole model, we have measured the attenuation law of alternating electric field produced by electric dipole signal source at sea. The results of experimental data analysis show that the electric longitudinal component of 1.06 Hz, 1.94 Hz and 3.22 Hz attenuate with 1.91 power, 1.91 power and 1.88 power in longitudinal direction of submarine plane. This proves the validity of theoretical values calculation.