Nature’s Blueprint for Robot Swarms
Animals such as bats, whales, and insects have long relied on sound to communicate and find their way. Drawing inspiration from this, an international group of scientists has developed a model for tiny robots that use sound waves to move and work together in large, coordinated swarms that behave almost intelligently. According to team leader Igor Aronson, Huck Chair Professor of Biomedical Engineering, Chemistry, and Mathematics at Penn State, these robotic collectives could eventually take on challenging missions like exploring disaster areas, cleaning polluted environments, or performing medical procedures inside the human body.

“Picture swarms of bees or midges,” Aronson said. “They move, that creates sound, and the sound keeps them cohesive, many individuals acting as one.”

The team’s findings were published in the journal Physical Review X.

Self-Organizing Machines With a Mission
Because these miniature, sound-emitting micromachines can organize themselves, they are capable of navigating confined spaces and reassembling if they are disrupted. This collective or “emergent” intelligence could make them valuable for cleaning contaminated environments, Aronson explained.

In addition to environmental applications, the robotic swarms might one day operate inside the body to deliver medication directly to targeted sites. Their ability to sense environmental changes and “self-heal” allows them to remain functional even after being separated, which could be particularly advantageous for detecting threats or serving as advanced sensors, Aronson said.