Sensor-Based Reactive Execution of Symbolic Rearrangement Plans by a Legged Mobile Manipulator
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General Robotics, Automation, Sensing and Perception Laboratory
Kod*lab
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Kodlab
reactive and sensor-based planning
legged robots
task planning
collision avoidance
Electrical and Computer Engineering
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Systems Engineering
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Abstract
We demonstrate the physical rearrangement of wheeled stools in a moderately cluttered indoor environment by a quadrupedal robot that autonomously achieves a user's desired configuration. The robot's behaviors are planned and executed by a three layer hierarchical architecture consisting of: an offline symbolic task and motion planner; a reactive layer that tracks the reference output of the deliberative layer and avoids unanticipated obstacles sensed online; and a gait layer that realizes the abstract unicycle commands from the reactive module through appropriately coordinated joint level torque feedback loops. This work also extends prior formal results about the reactive layer to a broad class of nonconvex obstacles. Our design is verified both by formal proofs as well as empirical demonstration of various assembly tasks. For more information: Kod*lab