平面辐射器截断参量源的辐射声场:模型与实验

Acoustic radiation field of the truncated parametric array generated by a panel radiator:model and experiment

摘要: 提出了一种计算以圆形平面活塞辐射器作发射源的声截断参量阵辐射声场的理论模型。即把由声低通滤波器截断的高频原波参量作用区在活塞辐射器的瑞利距离之内可以看作圆柱型的空间分布源。当活塞辐射器半径与参量作用区的长度相比小得多时。这种截断参量源模型可以退化到 Berktay的线源端射阵模型(End-Fire Line Array)。数值计算与实验的对比表明,按此模型计算得到的参量源辐射声场,尤其是在近轴附近与实验测量符合较好。

Abstract: A theoretical model is presented to describe the parametric acoustic field generated by a panel piston.The interaction region that is truncated by a low-pass acoustic filter can be viewed as a constant-intensity cylindrical source within the Rayleigh Distance of the piston.When the radius of the piston is much smaller than the length of the parametric region,this model is reduced to the Berktay's End-Fire Line Array model.Comparisons between numerical calculations and experimental measurement show that the generated acoustic field (especially near the axis) agrees well with the experiment.