In this paper, we propose an acoustic metamaterial with a microstructure consisting of two internal resonators. The performance of this dual-resonator metamaterial is compared to the original singleresonator metamaterial. Analytical findings show that the dual-resonator metamaterial exhibits its negative effective mass density over a larger frequency spectrum, particularly at two distinctively asymptotic regions. The wave propagation phenomenon in the metamaterial is investigated using finite element simulation. Computational results reveal that the dual-resonator metamaterial is capable of attenuating wave propagation in a larger operating frequency. Practical applications like vibration control and blast mitigation are demonstrated and discussed.
Metamaterials '2012: The Sixth International Congress on Advanced Electromagnetic Materials in Microwaves and Optics
Tan, Kwek Tze; Huang, H. H.; and Sun, C. T., "Negative Effective Mass Density of Acoustic Metamaterial using Dual-Resonator Spring-Mass Model" (2012). Mechanical Engineering Faculty Research. 1089.