一种低旁瓣非均匀圆形活塞换能器的设计

Design of a Low Sidelobe Non-Uniform Circular Piston Transducer

针对水声换能器的指向性旁瓣级问题,该文提出了一种低旁瓣非均匀圆形活塞平面水声换能器。该换能器在均匀圆形活塞换能器的基础上,采取去双环分布方法去除均匀圆形活塞换能器部分压电相体积,改变换能器结构,实现了抑制旁瓣的效果。以均匀连续平面活塞阵为基础,该文推导了去双环圆形平面活塞阵指向性函数,并采用Matlab对该指向性函数求解,分析两个环的位置和宽度随换能器指向性最大旁瓣级的变化规律,根据优化结果确定了换能器的最优尺寸。通过有限元仿真分析表明,该去双环圆形活塞换能器指向性最大旁瓣级为-25.3 dB,与均匀圆形活塞换能器相比,最大旁瓣级降低了8.3 dB,实现了旁瓣抑制,有效降低了最大旁瓣级。

Aiming at the problem of directivity sidelobe of hydroacoustic transducer,a low sidelobe non-uniform circular piston planar hydroacoustic transducer was proposed in this paper.Different from the uniform circular piston transducer,the proposed transducer adopts a method of removing the double ring distribution to remove part of the piezoelectric phase volume of the uniform circular piston transducer,thus changes the transducer structure,and realizes the effect of suppressing sidelobes,which was based on the uniform circular piston transducer,and adopted the double ring-removal distribution method to remove part of the piezoelectric phase volume of the uniform circular piston transducer,thus changed the transducer structure to achieve the effect of sidelobe suppression.Based on the uniform continuous planar piston array,the directivity function of the double ring-removal circular planar piston array is derived.The Matlab is used to solve the directivity function,the variation of the position and width of the two rings with the maximum sidelobe level of the transducer directivity is analyzed and the optimal size of the transducer is determined based on the optimization results.The finite element analysis simulation results show that the maximum sidelobe level of the double ring-removal circular piston transducer is-25.3 dB,and compared with the uniform circular piston transducer,the maximum sidelobe is reduced by 8.3 dB,which realizes the effect of sidelobe suppression,effectively reduces the maximum sidelobe level.