Metamaterial with mass-stem array in acoustic cavity

A vibro-acoustic metamaterial with negative effective mass has been designed and fabricated. This metamaterial consists of an array of wire stems with attached tiny masses in an acoustic cavity. These internal masses contribute to energy absorption near the natural frequencies of the designed structure. This metamaterial damps single resonance of internal mass and has larger mass damping parameter than stiffness damping parameter. Ease of fabrication makes the metamaterial practical for dynamic disturbance mitigation and acoustic attenuation.