Acoustic meta-surface development
Last updated on April 7, 2022
A series of acoustic metasurfaces with periodic structures are proposed using porous materials including meta-based fibrous materials and polymer foam to refract an incidence wave in an anomalous yet controllable way.
In one period, there are several elements responding to incident wave differently. Through carefully designing the individual elements, the reflected or refracted waves can be manipulated. The anomalous behaviours are predicted theoretically and validated by numerical simulations and laboratory tests. Based on the capability of wave manipulation, the acoustic energy can be prevented from radiating into the far field, resulting in effective noise control. Considering aeroacoustic applications, e.g. acoustic liners in engines, the studies on the effects of grazing-incidence acoustic waves and flow on the metasurfaces are being implemented.
