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Coherent virtual absorption of elastodynamic waves.

G Trainiti1, Y Ra'di2,3, M Ruzzene1,4

  • 1Daniel Guggenheim School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.

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Summary
This summary is machine-generated.

Researchers demonstrate virtual absorption in lossless elastic cavities, perfectly absorbing and releasing wave energy on demand. This method offers new avenues for elastodynamic wave control and energy storage without material loss.

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Area of Science:

  • Acoustics and wave physics
  • Materials science
  • Solid mechanics

Background:

  • Traditional absorbers dissipate wave energy as heat, limiting efficiency.
  • Lossless materials cannot absorb incident waves, leading to transmission or scattering.
  • Temporal modulation offers a way to achieve 'virtual absorption' without material loss.

Purpose of the Study:

  • To extend the concept of virtual absorption to elastodynamics.
  • To experimentally demonstrate perfect absorption of longitudinal elastic waves in a lossless system.
  • To explore controlled energy release from the system.

Main Methods:

  • Utilizing a lossless elastic cavity.
  • Employing temporal modulation of impinging longitudinal elastic waves.
  • Experimentally controlling the relative phase of incident signals for energy release.

Main Results:

  • Perfect absorption of longitudinal elastic motion was achieved in a lossless elastic cavity.
  • Stored elastic energy could be released symmetrically or asymmetrically.
  • The system demonstrated efficient energy storage and on-demand release.

Conclusions:

  • Virtual absorption is feasible in elastodynamics, offering an alternative to dissipative absorbers.
  • This technique enables precise control over elastodynamic wave propagation and energy management.
  • The findings have potential applications in phononic and photonic systems for wave control and energy storage.