有限振幅声波间的非线性相互作用对声源远场指向性的影响

Effect of finite-amplitude acoustic wave nonlinear interaction on farfield directivity of sound source

根据Fenlon理论推导得到了多频声源的辐射声压.基于单频声源谐波指向性的求解方法,得到了二阶近似下的双频声源辐射出的声波相互作用时的远场指向性.分别研究和讨论了在初始辐射声压和频率不同情况下,两列波的相互作用对其中一列波的一阶波和二阶波远场指向性的影响.结果表明,声波间的相互作用对声源远场指向性的影响根据各波之间的相对初始辐射声压和相对频率的不同而有所变化.

The acoustic radiation pressure expression of a multi-frequency sound source is obtained on the basis of the Fenlon theory.Then using the solution method of a monochromatic source harmonic wave directivity,farfield directivity of second-order approximate is obtained in the case of the dual-frequency sound source interaction.Subsequently,the effect of two-wave interaction on the farfield of first-order and second-order wave of either wave is studied and discussed when the initial radiation pressures and frequencies are different.The conclusion is that there are some different effects of sound wave interaction on the farfield directivity of a sound source,when the relative initial radiation pressure and frequency between the sound waves is changed.