SLS: Broadband acoustic energy attenuation of double porosity metamaterials with compression constraints and mass inclusions

A double porosity poroelastic metamaterial is introduced for broadband acoustic energy attenuation. Due to the internal geometric structure of the metamaterial, global rotation occurs when the metamaterial is subjected to static compression. The global rotation results in softening the effective stiffness of the metamaterial, and thus the wave transmission and absorption properties of the metamaterial can be tuned. The influences of mass inclusions, compression constraints, and different base poroelastic media are examined computationally and experimentally. Results show that the mass inclusions, applied constraints, and different kinds of poroelastic materials can have significant influence on the wave energy attenuation properties. This research uncovers the possibilities to enhance acoustic insulation properties of poroelastic materials in noise control and other relevant applications.

Advisor: Dr. Ryan Harne