振速变化的环形活塞声源系统的设计分析与仿真研究

设计了环形平面活塞声源系统。从理论上导出了该系统远场指向性公式，并对其正确性和有效性进行了仿真分析。仿真结果表明：该阵地任何声频都有指向性；且环形活塞面积和相邻两活塞中心间距愈小、振速幅度愈大、活塞数量愈多，指向性愈强。当环形活塞的面积、振速幅度、数量一定，且相邻两活塞中心间距为活塞外直径（极限值）时，指向性最强。本文的研究在工程上具有重要的指导意义。

Design Analysis and Simulation Research of Ring Piston Source System

The use of single ring piston sound source to detect target suffers from two disadvantages: directivity is bad and action distance is short. For greatly reducing these two disadvantages, we developed a system of ring piston plane sound sources. In this paper the system and its structure, and the directivity simulation tests under condition of different vibrating velocity of ring piston, different area of ring piston and different number of ring piston are described. From the simulation results we can conclude that this system has directivity at any acoustic frequency, the smaller the area of ring piston is, the stronger its directivity is; the bigger amplitude of vibrating velocity is, the stronger it is; the more number of ring piston are, the stronger it is. Hence, the research in this paper has an important reference value for engineering research.