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This study introduces a novel membrane-type smart metamaterial for enhanced low-frequency noise control. The multi-modal resonant piezoelectric metamaterial broadens bandgaps and achieves significant sound insulation with tunable properties.

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Area of Science:

  • Acoustics
  • Materials Science
  • Mechanical Engineering

Background:

  • Metamaterials offer potential for low-frequency noise control, but narrow bandgaps limit practical applications.
  • Existing metamaterial designs often require structural modifications for tuning sound insulation properties.

Purpose of the Study:

  • To develop a membrane-type smart metamaterial with multi-modal sound insulation capabilities.
  • To broaden the bandgap of metamaterials for improved low-frequency noise control.
  • To enable tunable sound insulation without altering the metamaterial's physical structure.

Main Methods:

  • Fabrication of a membrane-type metamaterial using an aluminum membrane bonded with multi-modal resonant piezoelectric resonators.
  • Utilizing simulation and experimental methods to analyze sound insulation properties and bandgap characteristics.
  • Applying the effective medium method to derive the negative effective bending stiffness.

Main Results:

  • Broadened locally resonant bandgaps demonstrated through multi-modal resonance, with percent bandwidths of 0.19 and 0.22.
  • Achieved high multi-modal sound insulation (>37 dB) below 2000 Hz with ultra-thin thickness.
  • Demonstrated tunability of sound insulation by adjusting external electrical circuits, not structural modifications.

Conclusions:

  • The proposed multi-modal resonant piezoelectric metamaterial effectively broadens bandgaps and enhances sound insulation in the low-frequency regime.
  • Tunable sound insulation achieved via external circuit adjustments offers practical advantages for noise control applications.
  • The negative effective bending stiffness is identified as the key mechanism for the observed sound insulation performance.