Mutual Inductance and Coupling Effects in Acoustic Resonant Unit Cells

Area of Science:

• Acoustics
• Materials Science
• Metamaterials

Background:

• Acoustic metamaterials (AMMs) offer unique wave manipulation capabilities.
• Designing AMMs with tunable properties is crucial for advanced acoustic devices.

Purpose of the Study:

• To introduce a novel acoustic metamaterial (AMM) based on a dumbbell-shaped split hollow sphere (DSSHS).
• To investigate the tunability of the AMM's negative modulus property by adjusting structural parameters.
• To explore the potential of DSSHS-based AMMs for creating multiband and broadband acoustic devices and metasurfaces.

Main Methods:

• Experimental and simulation-based transmission analysis of the DSSHS acoustic metamaterial.
• Investigating the effect of the distance between split holes on the resonant frequency and coupling.
• Designing arrays of DSSHS clusters to achieve multiband and broadband properties.

Main Results:

• A distinct transmitted dip at the resonant frequency confirmed the negative modulus property of the AMM.
• The resonant frequency and negative modulus were effectively manipulated by tuning the distance between the split holes.
• Arraying DSSHS clusters with varying distances enabled the creation of multiband and broadband AMMs with negative modulus.

Conclusions:

• The DSSHS structure provides a versatile platform for developing tunable acoustic metamaterials.
• The strong coupling effect within the DSSHS allows for precise control over acoustic properties.
• This AMM design shows promise for applications in acoustic metasurfaces and abnormal wave control.