基于双层柱状结构的声场局域与聚焦现象

Local and Focusing of Sound Field Based on Double Layer Cylindrical Structure

本文研究了浸没在水中双层柱状结构的声聚焦效应及声场奇异局域效应,并探索了声聚焦频率与圆柱结构参数之间的关系.研究表明:当超声波源入射到双层柱状结构表面时,在圆柱结构中心会出现声聚焦效应,并在不同频率下出现单极、偶极及多极局域声场的高低周期分布,且周围环境的声场声压几乎为零.这种声聚焦效应源于干涉衍射以及金属圆柱结构中的位移本征模式.

The acoustic focusing effect and the singular local effect of the bilayer columnar structure immersed in water were studied,and the relationship between the acoustic focusing frequency and the cylindrical structure parameters was explored.The results show that when the ultrasonic source is incident on the surface of the double columnar structure,the acoustic focusing effect occurs in the center of the cylindrical structure.The high and low cycle distributions of single-stage,dipole and multi-stage local sound fields occur at different frequencies,and the sound pressure in the surrounding environment is almost zero.This acoustic focusing effect results from the interference diffraction and the displacement eigenmode in the metal cylindrical structure.