Acoustic metamaterials with circular sector cavities and programmable densities

Area of Science:

• Acoustics
• Materials Science
• Wave Physics

Background:

• Current acoustic metamaterials are passive with fixed properties, limiting their wave manipulation capabilities.
• Controlling acoustic wave propagation in fluid domains requires advanced material designs.

Purpose of the Study:

• To develop a new class of one-dimensional composite active acoustic metamaterials (CAAMM).
• To enable programmable effective dynamic density adaptation along the metamaterial.
• To explore the manipulation of acoustic wave energy through active material properties.

Main Methods:

• Theoretical analysis of multilayered composite active acoustic metamaterials (CAAMM).
• Modeling of fluid cavities coupled with flexible piezoelectric active boundaries.
• Electrical manipulation of piezoelectric boundary stiffness for density control.
• Lumped-parameter approach to model cell interactions.

Main Results:

• Demonstrated theoretical predictions for CAAMM with programmable dynamic density.
• Showcased the capability to manipulate effective dynamic density via piezoelectric stiffness.
• Presented numerical examples validating performance characteristics.

Conclusions:

• The proposed CAAMM offers a pathway to actively control acoustic wave propagation.
• Programmable dynamic density enables tailored spatial and spectral patterns of acoustic manipulation.
• This research advances the field of adaptive acoustic metamaterials.