Marston Philip L
Physics and Astronomy Department, Washington State University, Pullman, Washington 99164-2814,
J Acoust Soc Am. 2019 Jan;145(1):EL39. doi: 10.1121/1.5087646.
When considering the scattering of sound and radiation forces for spheres, it has historically been helpful to understand situations lacking dissipation. In that case the scattering is characterized by real partial-wave phase shifts. At low frequencies expansions show the dependence of each phase shift on material properties and on frequency. Those expansions are used here to describe the frequency and material dependence of scattering and radiation forces beyond the usual Rayleigh-scattering approximation. Results for radiation forces on spheres in standing waves are extended to plane progressive waves. The expansion coefficients use algebraic functions. Results for movable and fixed rigid spheres are shown.
在考虑球体的声散射和辐射力时，从历史上看，理解无耗散的情况是很有帮助的。在那种情况下，散射由实部分波相移来表征。在低频时，展开式显示了每个相移对材料特性和频率的依赖性。这里使用这些展开式来描述散射和辐射力在超出通常瑞利散射近似之外对频率和材料的依赖性。驻波中球体辐射力的结果被扩展到平面行波。展开系数使用代数函数。给出了可移动和固定刚性球体的结果。
