Sound Scattering and Its Reduction by a Janus Sphere Type
Figure 3
The frequency variation of the scattered acoustic power that is normalized by the incident wave’s power per the sphere’s cross-sectional area. The sphere’s radius is 1 m and is (a) in free space, (b) its centre is 2.1 m away from a free surface, and (c) 2.1 m away from a hard ground. The hard-soft configuration means the soft zone faces the incoming sound wave and the soft-hard configuration means vice versa. The zones’ sizes were optimised to minimise the scattered acoustic power.
