Using Acoustic Resonators as Thrusters for Small Robots

Researchers have found an unconventional way to power tiny robots using sound waves. Per Hackaday, a team led by Junsun Hwang has developed acoustic thrusters based on Helmholtz resonance—the same acoustic principle used in musical instruments. When stimulated by ultrasound at the right frequency, specially designed chambers produce jets of air for steering and propulsion. The prototypes, created with high-resolution 3D printing, weigh mere micrograms and generate only a fraction of a Newton of thrust. It's a demonstration of acoustic propulsion at the miniature scale, though not yet practical for everyday robotic applications.

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