Soft robot detects damage, heals itself (video)

Soft robot detects damage, heals itself
Researchers installed SHeaLDS—self-healing light guides for dynamic sensing—in a soft robot resembling a four-legged starfish and equipped with feedback control. After the researchers punctured one of its legs, the robot was able to detect the damage and self-heal the cuts. Credit: Cornell University

Cornell University engineers have created a soft robot capable of detecting when and where it was damaged—and then healing itself on the spot.

"Our lab is always trying to make robots more enduring and agile, so they operate longer with more capabilities," said Rob Shepherd, associate professor of mechanical and aerospace engineering. "If you make robots operate for a long time, they're going to accumulate damage. And so how can we allow them to repair or deal with that damage?"

Shepherd's Organic Robotics Lab has developed stretchable fiber-optic sensors for use in and related components—from skin to . They report on their work in Science Advances.

For to work, Shepherd says the key first step is that the robot must be able to identify that there is, in fact, something that needs to be fixed.

Credit: Science Advances (2022). DOI: 10.1126/sciadv.abq2104

To do this, researchers have pioneered a technique using fiber-optic sensors coupled with LED lights capable of detecting minute changes on the surface of the robot. These sensors are combined with a polyurethane urea elastomer that incorporates , for rapid healing, and disulfide exchanges, for strength.

The resulting SHeaLDS—self-healing light guides for dynamic sensing—provides a damage-resistant soft robot that can self-heal from cuts at room temperature without any external intervention.

To demonstrate the technology, the researchers installed the SHeaLDS in a soft robot resembling a four-legged starfish and equipped it with feedback control. Researchers then punctured one of its legs six times, after which the robot was then able to detect the damage and self-heal each cut in about a minute. The robot could also autonomously adapt its gait based on the damage it sensed.

While the material is sturdy, it is not indestructible.

"They have similar properties to human flesh," Shepherd said. "You don't heal well from burning, or from things with acid or heat, because that will change the chemical properties. But we can do a good job of healing from cuts."

Shepherd plans to integrate SHeaLDS with machine learning algorithms capable of recognizing tactile events to eventually create "a very enduring that has a self-healing skin but uses the same skin to feel its environment to be able to do more tasks."

More information: Hedan Bai et al, Autonomous self-healing optical sensors for damage intelligent soft-bodied systems, Science Advances (2022). DOI: 10.1126/sciadv.abq2104

Journal information: Science Advances
Provided by Cornell University
Citation: Soft robot detects damage, heals itself (video) (2022, December 7) retrieved 19 July 2024 from
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