Working effectively with other humans is an essential part of working life, and building great teams is fundamental to effective leadership. Working alongside robots is somewhat harder, however, especially in physical tasks that require man and machine to coordinate effectively. Whereas humans can sense small changes in motion and coordinate effectively, this is much harder for robots to understand. Researchers have developed a robot that’s capable of monitoring the muscle movements of human teammates.
Until now anyway, as researchers from MIT’s Computer Science and Artificial Intelligence Laboratory (CSAIL) have developed a robot that’s capable of monitoring the muscle movements of human teammates.
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The system works by using EMG sensors placed on the arms of the user that monitor muscle activity, with algorithms then used to instantly detect changes in either the position or the movements of the arm and hand. The system was put through its paces in a mock environment similar to that found in airplane manufacturing. The experiments allowed the human/robot teams to place materials within a few inches of the desired height, with the robot responding correctly to around 70% of the gestures made by their human colleague.
“Our approach to raising objects with an automaton aims to be intuitive and the same as however you would possibly lift one thing with another person – roughly repeating each other’s motions whereas inferring helpful adjustments.
The key insight is to use nonverbal cues that inscribe directions for a way to coordinate, for example, to lift a little higher or lower” the researchers explain.
“Using muscle signals to speak virtually makes the automaton sub-degree extension of yourself that you just will fluidly manage.”
Signal and Noise
The system, known as RoboRaise, gets around the problem of poor quality EMG signals by ensuring that the human remains in control of proceedings. An array of non-invasive sensors is placed on the body to detect the neurons that fire when our muscles tense or relax.
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These signals are then analyzed by the algorithm to understand how the human arm is moving and therefore how the robot needs to respond.
The system is designed to require minimal calibration before its usable, with users simply required to tense and relax their arm a few times while wearing the sensors and lift a weight to various heights to simulate typical movements.
RoboRaise was put through its paces on a series of assembly tasks, including lifting a rubber sheet onto a base structure, and it was able to lift both a number of rigid and flexible items successfully. During testing, the rig was installed onto a Baxter robot, but the team believes it could easily be deployed on any robotic platform.
The project is still at an early stage, and the team hopes to explore added functionality that will allow RoboRaise to work with different muscle groups, and even appreciate and predict fatigue in their human colleague. It’s certainly an interesting tool, and you can see it in action soon.
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