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Tunable cylindrical shell as an element in acoustic metamaterial.

Alexey S Titovich1, Andrew N Norris1

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This study presents an acoustic metamaterial using elastic cylindrical shells with internal mechanisms to achieve tunable acoustic properties. The designed metamaterial demonstrates near-zero scattering and wave steering capabilities, offering novel applications in acoustics.

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Area of Science:

  • Acoustics
  • Materials Science
  • Wave Physics

Background:

  • Elastic cylindrical shells can be engineered to exhibit tailored acoustic properties.
  • Metamaterials offer unique acoustic responses not found in natural materials.
  • Controlling wave propagation and scattering is crucial for acoustic applications.

Purpose of the Study:

  • To design and demonstrate an acoustic metamaterial with tunable effective acoustic properties.
  • To suppress flexural waves in elastic shells for enhanced acoustic performance.
  • To achieve near-zero scattering and wave steering using engineered acoustic metamaterials.

Main Methods:

  • Optimization of an internal mechanism within elastic cylindrical shells.
  • Tuning effective acoustic properties (bulk modulus and density) via mass and stiffness.
  • Suppression of flexural waves using a sufficient number of elastic stiffeners.
  • Demonstration of metamaterial effectiveness by matching water's acoustic properties.
  • Design of a cylindrical-to-plane wave lens using an array of tuned shells.

Main Results:

  • Prescribed effective acoustic properties (bulk modulus and density) were achieved.
  • Subsonic flexural waves were suppressed by the internal stiffeners.
  • A thin aluminum shell with a polymer insert matched water's acoustic properties.
  • Near-zero scattering cross-section was observed over a broad frequency range.
  • Wave steering capabilities were demonstrated, including a cylindrical-to-plane wave lens.

Conclusions:

  • Elastic cylindrical shells with optimized internal mechanisms function as effective acoustic metamaterials.
  • The proposed metamaterial allows for precise tuning of acoustic properties and wave manipulation.
  • The demonstrated near-zero scattering and wave steering capabilities open avenues for advanced acoustic devices.