Journal
IEEE ROBOTICS AND AUTOMATION LETTERS
Volume 4, Issue 4, Pages 4019-4026Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LRA.2019.2930486
Keywords
Assembly; space robotics and automation; path planning for multiple mobile robots or agents
Categories
Funding
- NASA Space Technology Mission Directorate's Game Changing Development Program through the Automated Reconfigurable Mission Adaptive Digital Assembly Systems project
- NASA Space Technology Research Fellowship [NNX14AM40H]
- CBA consortia funding
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We present a material-robot system consisting of mobile robots that can assemble discrete cellular structures. We detail themanufacturing of cuboctahedral unit cells, termed voxels, which passively connect to neighboring voxels with magnets. We then describe relative robots that can locomote on, transport, and place voxels. These robots are designed relative to and in coordination with the cellular structure-the geometry of the voxel informs the robot's global geometric configuration, local mechanisms, and end effectors, and robotic assembly features are designed into the voxels. We describe control strategies for determining build sequence, robot path planning, discretemotion control, and feedback, integrated within a custom software environment for simulating and executing a single or multi-robot construction. We use this material-robot system to build several types of structures, such as one-dimensional (1-D) beams, 2-D plates, and 3-D enclosures. The robots can navigate and assemble structures with minimal feedback, relying on voxel-sized resolution to achieve successful global positioning. We show a multi-robot assembly to increase the throughput and expand system capability using a deterministic centralized control strategy.
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