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Researchers explored acoustic radiation force on pulsating spheres, finding ways to control pushing and pulling forces by adjusting wave properties or sphere vibrations. This enables precise acoustic manipulation for micro-devices.

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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Mechanical Engineering

Background:

  • Acoustic radiation force is crucial for acoustic manipulation.
  • Controlling acoustic forces on vibrating objects is complex.
  • Understanding interactions between acoustic waves and radiators is essential.

Purpose of the Study:

  • To derive and analyze the acoustic radiation force function for a pulsating sphere.
  • To present strategies for controlling the magnitude and direction of acoustic radiation force.
  • To explore applications in acoustic handling and micro-mechanisms.

Main Methods:

  • Analytical derivation of the acoustic radiation force function.
  • Analysis of two strategies: manipulating incident wave fields and radiator pulsation characteristics.
  • Utilizing Nyquist plane representations for surface displacement and incident wave pressure.

Main Results:

  • Zero radiation force achieved by specific pulsation characteristics (frequency-dependent lines in Nyquist plane).
  • Zero radiation force achieved by specific incident wave properties (frequency-dependent circles in Nyquist plane).
  • Negative radiation force amplitude equals passive positive force amplitude; control over pushing/pulling states demonstrated.

Conclusions:

  • Precise control over acoustic radiation force (pushing, pulling, zero) is achievable.
  • Findings support the development of smart acoustic carriers and robust handling techniques.
  • Potential for precise motion control in acoustic-driven micro-mechanisms and micro-machines.