船舶缩比模型轴频电场的传播特征

为研究船舶轴频电场的传播特征,采用信号测量系统,测量和分析了船舶缩比模型轴频电场信号.轴频电场沿船方向传播的测试结果表明,轴频电场的空间分布具有区域性:当测量点从螺旋桨附近移至船尾时,x分量轴频电场信号由较弱逐渐增强至最大幅值,y分量和z分量轴频电场幅值则急剧降低.测量点由船体向外移动时,x分量轴频电场幅值迅速衰减;测量点移至船长倍数的0.33处时,衰减变得缓慢;测量点继续移至船长倍数的1.65处时,轴频电场特征信号不明显.

Transmission characteristic of shaft-frequency electric field based on ship's physical scale model

Transmission characteristic of shaft-frequency electric field based on a ship's physical scale model was analyzed using signal measurement system.The results indicate that the spatial distribution of shaft-frequency electric field has regional characteristic when transmitting along the ship.During the process when measuring point moves from propeller to stern,x-axis shaft-frequency electric field changes from feebleness to the strongest whereas that of y-axis and z-axis reduces sharply.The shaft-frequency electric field signal of x-axis reduces sharply when the electrode is shifted from hull to its outside region.The attenuation slows down while the removed distance exceeds 0.33 times of the ship length.The shaft-frequency electric field signal of x-axis becomes indistinct as the removed distance reaches 1.65 times of the ship length.