WRAP: 治具不要の力覚考慮型マルチロボット組立計画
WRAP: Fixtureless Wrench-aware Multi-Robot Assembly Planning
複数ロボットで治具を使わずに組立を行うため、力の釣り合いを線形計画で考慮しつつ組立順序と把持を計画する手法を提案し、シミュレーションと実機で検証した。
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著者: Valentin N. Hartmann, Huang Su, Yijiang Huang, Stelian Coros
分類: cs.RO
原文アブストラクト
Assembly using robots often requires specially designed fixtures, or relies on top-down only assembly strategies. Using multiple robots, we can avoid using fixtures and make robotic assembly more flexible. Planning assembly sequences for multiple robots is challenging due to the high number of possible task assignments and orders. In addition, we need to reason over forces that occur during the assembly process, e.g., to decide if multiple robots are required for support, or if external support such as a table should be used. We present Wrap, a multi-robot assembly planner for multi-part assemblies, given the inter-part ordering-dependencies, the part meshes, and their initial state. We formulate a linear program to reason about valid grasps for supporting the forces that occur during assembly. The search leverages the assembly sequence, and greedily finds a feasible solution per assembly step by computing a heuristic via a cheap backwards search, and using the heuristic in the more expensive forward search. We then solve the multi-robot, multi-goal motion planning problem, and for execution, we split the plan into contact-rich assembly skills, and free space motion. We benchmark the planner on a variety of multi-part assemblies, and apply the planner to groups of robots differing in size and kinematics. We validate the work both in a physics simulation, and in real. Videos and code are available at https://www.vhartmann.com/wrap.