环状活塞换能器辐射声场研究

Radiated sound field of ring plunger

研究了环状活塞声源辐射声场的特性.利用瑞利积分,计算出了环状活塞声源辐射声场的远场声压分布,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,环带较窄时,旁瓣较大,主瓣较窄;环带较宽时,旁瓣较小,主瓣较宽.讨论了近场情况下轴上的声压分布,为进一步研究同心圆环聚焦阵提供了理论依据.根据惠更斯原理,推出了由m个同心圆环构成的相控阵的三维声压分布,并利用计算机做出了模拟图.

The radiated sound field of ring plunger is analyzed. The sound pressure distribution in threedimensional space is calculated out by use of Reilyintegrate, and its near field distribution, plotted out by numerical method, an analysis is made of directivity of wave steering. It shows wave directivity has been influenced by plunger size or wave frequency. All this can be applied to studying constrictingring arrays. The analytical pressure distribution for the beam focusing is then obtained by the Huygen′s principle. This expression is useful for studying the far field characteristics of the focused beam. The directivities are quantitatively analyzed.