Customizable sound-absorbing metasurface with reserved reversible shape changing performance.

Low-frequency sound-absorbing meta-surface is an eye-catching topic in scientific and engineering community. Numerous studies of low-frequency sound-absorbing meta-surface have been explored. However, an acoustic meta-surface with simultaneous low-frequency sound absorption and reversible shape changing property remains absent up till now. In this paper, we propose an acoustic meta-surface by coupling 15 sub-units to realize a desired low-frequency sound absorption. The measured energy attenuation of acoustic meta-surface is average up to 90% from 300 to 1000 Hz, well agreed with stimulated results. The sound absorption band of the designed structure can be customized through flexibly adjusting the sub-units. More surprisingly, the proposed acoustic meta-surface is capable of withstanding large loads and possesses a reversible shape changing property. The unique low-frequency sound absorption and the mechanical properties open interesting perspectives for the use of acoustic meta-surface in low-frequency noise control applications. [ABSTRACT FROM AUTHOR]