Abstract：To broaden the sound insulation bandwidth of acoustic metamaterials in low frequency sound waves, a double-layer membrane acoustic metamaterial with electromagnetic tunable frequency was designed, which was composed of a double-layer membrane, carbonyl iron powder between membranes, additional lead, aluminum frame and electromagnetic field loading device. The acoustic performance of the acoustic metamaterial was investigated by COMSOL Multiphysics 5.5 simulation software and experiment methods. The results show that the acoustic metamaterial can achieve good sound insulation effect in low frequency range, and the natural frequency of the acoustic metamaterial can be achieved by changing magnetic field strength with inputting different currents. Compared with passive acoustic metamaterials, the non-contact active control of sound insulation performance of the acoustic metamaterials can be achieved by directional adjustment, and the sound wave control bandwidth of the structure can be broadened. The influence of material parameters on the acoustic properties of acoustic metamaterials illuminates that with the increasing of double-layer membrane thickness, the Young′s modulus is increased， and the acoustic metamaterial can obtain wider sound insulation bandwidth.
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2021, Vol. 42 
