均匀活塞阵辐射声场研究

Research on radiation sound field of uniform piston transducer array

主要研究了均匀活塞阵的近-远场的辐射声场。首先利用点源声波干涉原理建立均匀点源活塞阵的辐射声场理论,进而推导均匀活塞阵的近-远场的辐射声场函数表达式,并采用Matlab软件仿真了近-远场的辐射声场,分析了近-远场的声场变化规律、声轴方向声压的变化规律和旁瓣级的变化规律。通过与实测的80 kHz均匀活塞阵换能器近-远场的辐射声场对比,表明了实测结果与仿真结果基本一致,验证了理论与测量方法的可行性,能够为实际测量工作提供指导。

In this paper,the near-far radiation sound field of uniform piston transducer array is studied.Firstly the sound field theory of uniform cylindrical point source array is established according to the principle of point source acoustic interference,then the expression of the near-far radiation sound field of uniform piston transducer array is deduced,and the near-far field directivity is simulated by Matlab.The radiation sound field pattern of near-far field,the variation of sound pressure in the sound axis direction and the variation of side-lobe levels are analyzed.The near-far radiation sound field of the prepared uniform piston transducer array of 80 kHz is measured.By comparison,it is shown that the measured results are basically consistent with the simulation results.The theory and measurement method in this paper are proved to be feasible and can guide the actual measurement work.