带障板水听器基阵阵列流形的边界元计算及验证

Calculation and verification of manifold of baffled hydrophone array based on boundary element method

建立一种复杂结构水听器基阵阵列流形计算模型。该模型运用声场计算的边界元方法,通过计算任意散射体表面声场分布,求出基阵阵元位置处声场响应,进而得到基阵阵列流形;基于该阵列流形,运用波束设计方法求出阵元权值,分别利用实测和理论阵列流形得到基阵实测波束以及理论波束。针对安装在半球形硬质铝壳体上的圆弧阵进行的水池实验,实验结果表明实测阵列流形和基于边界元方法的计算结果基本吻合,实测波束和理论波束相差不大,并且性能均优于按无指向性点接收器经相位补偿后相加所得到的波束。

A model used for calculating the manifold of a baffled hydrophone array mounted on a complicated structure is presented. In the proposed model, the manifold of an arbitrary array is obtained by computing the scattered sound field response of the array elements based on the boundary element method （BEM）. Using the calculated manifold, the array element weights are derived using a beampattern optimization algorithm. Therefore, if the measured manifold and the theoretical manifold are known, we can get the measured beampattern and the theoretical beampattern. Watertank experiments were carried out for an arc array mounted on the surface of a half-sphere shell made of rigid aluminum. The results indicate that the measured manifolds are approximately identical to the theoretical manifolds calculated from the proposed model, and the measured beampattems are also consistent with the theoretical beampatterns. Moreover, the above beampatterns are much better than the beampatterns obtained from phase compensation assuming that the array elements are omnidirectional point hydrophones.