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You are here: Home / AI / Researchers develop soft robot that shifts from land to sea with ease

Mar 14 2023

Researchers develop soft robot that shifts from land to sea with ease

Most animals can quickly transition from walking to jumping to crawling to swimming if needed without reconfiguring or making major adjustments.

Most robots cannot. But researchers at Carnegie Mellon University have created soft robots that can seamlessly shift from walking to swimming, for example, or crawling to rolling.

“We were inspired by nature to develop a robot that can perform different tasks and adapt to its environment without adding actuators or complexity,” said Dinesh K. Patel, a post-doctoral fellow in the Morphing Matter Lab in the School of Computer Science’s Human-Computer Interaction Institute. “Our bistable actuator is simple, stable and durable, and lays the foundation for future work on dynamic, reconfigurable soft robotics.”

The bistable actuator is made of 3D-printed soft rubber containing shape-memory alloy springs that react to electrical currents by contracting, which causes the actuator to bend. The team used this bistable motion to change the actuator or robot’s shape. Once the robot changes shape, it is stable until another electrical charge morphs it back to its previous configuration.

“Matching how animals transition from walking to swimming to crawling to jumping is a grand challenge for bio-inspired and soft robotics,” said Carmel Majidi, a professor in the Mechanical Engineering Department in CMU’s College of Engineering.

For example, one robot the team created has four curved actuators attached to the corners of a cellphone-sized body made of two bistable actuators. On land, the curved actuators act as legs, allowing the robot to walk. In the water, the bistable actuators change the robot’s shape, putting the curved actuators in an ideal position to act as propellers so it can swim.

“You need to have legs to walk on land, and you need to have a propeller to swim in the water. Building a robot with separate systems designed for each environment adds complexity and weight,” said Xiaonan Huang, an assistant professor of robotics at the University of Michigan and Majidi’s former Ph.D. student. “We use the same system for both environments to create an efficient robot.”

The team created two other robots: one that can crawl and jump, and one inspired by caterpillars and pill bugs that can crawl and roll.

The actuators require only a hundred millisecond of electrical charge to change their shape, and they are durable. The team had a person ride a bicycle over one of the actuators a few times and changed their robots’ shapes hundreds of times to demonstrate durability.

In the future, the robots could be used in rescue situations or to interact with sea animals or coral. Using heat-activated springs in the actuators could open up applications in environmental monitoring, haptics, and reconfigurable electronics and communication.

“There are many interesting and exciting scenarios where energy-efficient and versatile robots like this could be useful,” said Lining Yao, the Cooper-Siegel Assistant Professor in HCII and head of the Morphing Matter Lab.

The team’s research, “Highly Dynamic Bistable Soft Actuator for Reconfigurable Multimodal Soft Robots,” was featured on the cover of the January 2023 issue of Advanced Materials Technologies. The research team included co-first authors Patel and Huang; Yao; Majidi; Yichi Luo, a mechanical engineering master’s student at CMU; and Mrunmayi Mungekar and M. Khalid Jawed, both from the Department of Mechanical and Aerospace Engineering at the University of California, Los Angeles.

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Researchers develop soft robot that shifts from land to sea with ease Republished from Source https://www.sciencedaily.com/releases/2023/03/230314110659.htm via https://www.sciencedaily.com/rss/computers_math/artificial_intelligence.xml

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Written by bizbuildermike · Categorized: AI · Tagged: AI

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