矩形活塞声源辐射声场研究

Radiated sound field of rectangled plunger

研究了矩形活塞声源幅射声场的特性.利用瑞利积分,计算了矩形活塞声源幅射声场的声压分布,画出了声压分布图,并分析了辐射声场的指向特性.结果表明,随着活塞尺寸的增加,声场指向性将变得尖锐.这一结论为进一步研究平面型声聚焦阵提供了理论基础.根据惠更斯原理,推出了由m个矩形活塞构成的相位阵的三维声压分布,并指出了辐射声场的指向性.

The focus is laid on analyzing radiated sound field of rectangled plunger. The sound pressure distribution in three_dimensional space has been calculated out by use of Reigly_integration, and amplitude distribution is plotted out by numerical method. Analysis is made of directivity of wave steering. It shows that wave directivity is influenced by plunger size or wave frequency. All this 2D arrays. The analytical pressure distribution for the beam focusing is then obtained by using the Huygen′s principle. This expression is useful for studying the far field characteristics of the beam focused. The directivities are quantitatively analyzed.