基于辐射阻分析的水声换能器基阵优化设计

针对互辐射阻对基阵的辐射功率的影响,计算了圆面活塞水声换能器及其基阵的辐射阻抗;分析了二元阵的互辐射阻特性,当阵元半径小于λ/2时,阵元间互辐射影响较强且呈现一定的规律性,当阵元半径大于λ/2时,阵元间互辐阻影响非常小,因此试图通过改善互辐射阻来提高辐射功率,阵元的半径应小于λ/2;在分析了二元阵、均匀线列阵和N×N均匀平面阵的互辐射阻特性基础上,对阵元半径小于λ/2的基阵布阵方式进行了优化设计,使其能获得较大的辐射功率。研究结果表明：阵元半径小于0.22λ时,密排方式最佳;阵元半径0.22λ〈a〈λ/2时,阵元间距为5λ/4布阵方式最佳。

The optimal design of underwater transducer array based on radiation resistance analysis

To the effect of mutual impedance on array’s radiation power,the radiation impedance of an underwater transducer array is computed;the mutual radiation resistance characteristics of two elements array is analyzed,the effect of mutual radiation is quite strong and disciplinary when element’s radius is less than λ/2 but very weak when element’s radius is bigger than λ/2;the mutual radiation resistance characteristics of two elements array,uniform linear array and N×N plane array are analyzed,the optimal design for higher radiation power of an array in which the element’s radius is less than λ/2 is done.The result shows that： when element’s radius is less than 0.22λ,the compact arrangement is the optimal one;when the radius of elements is bigger than 0.22λ,the distance of neighboring array elements should be 5λ/4.