【摘要】 利用瑞利积分,计算了环状活塞声源辐射声场的远场声压分布和指向性函数,分析了影响辐射声源指向性的几个因素.结果表明,当环状活塞的尺寸一定时,辐射频率增大,辐射声场指向性增强;辐射频率和环宽一定时,随活塞内径增大,辐射声场指向性增强;辐射频率和内径一定时,随活塞外径增大,辐射声场指向性仍增强;辐射频率和外径一定时,随活塞内径增大,辐射声场指向性增强.这表明辐射声场的指向性与环宽无必然因果关系.更多还原

【Abstract】 The sound pressure distribution in the far field and the directivity function are calculated by using the Rayleigh equation.Several factors that affect the directivity are analyzed.The result shows that the directivity intensifies with the increases of each parameter of the ring piston under different conditions respectively.It is indicated that the directivity does not relate to the width of the ring piston.更多还原