‘Touchy’ robot arm reaches past clutter
GEORGIA TECH (US) — Thanks to a robot with a flexible arm covered with tactile sensors, a man with quadriplegia was able to pull a blanket over himself and grab a cloth to wipe his face.
Whether reaching for a book out of a cluttered cabinet or pruning a bush in the backyard, people’s arms frequently makes contact with objects during everyday tasks. Animals do it too, when foraging for food, for example.
“I think it’s a good safety feature because it hardly presses against me even when I tell it to,” says Henry Evans, after the trial. “It really feels safe to be close to the robot.” (Credit: Georgia Tech)
Much in the same way, robots are now able to intelligently maneuver within clutter, gently making contact with objects while accomplishing a task. This new control method has wide applications, ranging from robots for search-and-rescue operations to assistive robotics for people with disabilities.
“Up until now, the dominant strategies for robot manipulation have discouraged contact between the robot’s arm and the world,” says Charlie Kemp, lead researcher and associate professor in the biomedical engineering department at Georgia Institute of Technology and Emory University.
“Instead of avoiding contact, our approach enables the arm to make contact with objects, people, and the rest of the robot while keeping forces low.”
Kemp, director of Georgia Tech’s Healthcare Robotics Lab, graduate students, and researchers at Meka Robotics have developed a control method that works in tandem with compliant robotic joints and whole-arm tactile sensing. This technology keeps the robot’s arm flexible and gives the robot a sense of touch across its entire arm.
With their control method, Kemp’s robots have performed numerous tasks, such as reaching through dense artificial foliage and a cinder block representative of environments that search-and-rescue robots can encounter.
The work appears in this month’s edition of the International Journal of Robotics Research.
Kemp’s lab also has promising results that could impact the future of assistive robotics. They have developed tactile sensors made out of stretchable fabric that covers the entire arm of a robot.
In a preliminary trial with the new control method and sensors, a person with quadriplegia used the robot to perform tasks for himself. From his bed in his home, Henry Evans pulled a blanket over himself and grabbed a cloth to wipe his face from his bed at his home.
“I think it’s a good safety feature because it hardly presses against me even when I tell it to,” says Evans, after the trial. “It really feels safe to be close to the robot.”
Evans was also impressed by how the robot’s arm “just wriggles around obstacles.”
Kemp’s research team has also released the designs and code for the sensors and controller as open source hardware and software so that researchers and hobbyists can build on the work.
The research is part of an ongoing effort to create a new foundation for robotics, where contact between the robot’s arm and the world is encouraged.
“Our belief is that this approach is the way of the future for robots,” says Kemp. “It is going to allow robots to better operate in our homes, our workplaces, and other complex environments.”
This trial was conducted as part of the Robots for Humanity project with Willow Garage. In order to ensure safety, researchers from Kemp’s lab closely monitored the activities. This research has been accepted to, and will be presented at, the International Conference on Rehabilitation Robotics in June.
DARPA and the NSF funded the project.
With the new control method, the robots have performed numerous tasks, such as reaching through dense artificial foliage and a cinder block representative of environments that search-and-rescue robots can encounter. (Credit: Georgia Tech)
Source: Georgia Tech
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