Steve Collins  Carnegie Mellon University  biomechatronics.cit.cmu.edu  NSF National Robotics Initiative: Rapid exploration of.

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Presentation transcript:

Steve Collins  Carnegie Mellon University  biomechatronics.cit.cmu.edu  NSF National Robotics Initiative: Rapid exploration of robotic ankle exoskeleton control strategies PI: Steve Collins Carnegie Mellon University Experimental Biomechatronics Laboratory

Steve Collins  Carnegie Mellon University  biomechatronics.cit.cmu.edu  Project Overview Missing keys for exoskeleton design: -Tools for rapid, systematic exploration -Neuromechanics models of performance Our approach: -Universal ankle-foot exoskeleton emulator -Measures from muscle fascicle to whole body

Steve Collins  Carnegie Mellon University  biomechatronics.cit.cmu.edu  Universal ankle-exoskeleton emulator Trades autonomy for exceptional versatility. From idea to experiment in hours, not years.

Steve Collins  Carnegie Mellon University  biomechatronics.cit.cmu.edu  Multi-scale locomotion physiology toolset From whole-body dynamics and chemistry… … to individual muscle mechanics and activation

Steve Collins  Carnegie Mellon University  biomechatronics.cit.cmu.edu  Assistance strategies worth exploring 1. Impedance: springs and (negative) dampers 2. Proportional EMG: muscle amplifier 3. Reflex-like: virtual muscles and neurons 4. Trajectory-based: on the clock

Steve Collins  Carnegie Mellon University  biomechatronics.cit.cmu.edu  Intra-controller experiments Systematic exploration along key parameters

Steve Collins  Carnegie Mellon University  biomechatronics.cit.cmu.edu  Inter-controller experiments Comparison of each approach at its best

Steve Collins  Carnegie Mellon University  biomechatronics.cit.cmu.edu  1. Jackson and Collins (2014) In review: Journal of Experimental Biology 2. Zhang and Collins (2014) In review: International Journal of Robotics Research 3. Witte and Collins (2015) In preparation for International Conference on Robotics and Automation Milestones: Ahead of Schedule Completed: -Embodiment of all high-level controllers 1 -Parameter sweep on impedance control 2 -Platform improvements and duplication 3 In progress: -Proportional EMG sweep (Q2, 2015) -Online optimization (Q4, 2014) -Expansion to knee (Q4, 2014)