Abstract
We propose a distributed force and torque controller for a group of robots to collectively transport objects with both translation and rotation control. No explicit communication among robots is required. This work goes beyond previous works by including rotation control and experimental demonstrations on a custom built robot platform. We prove that follower robots can synchronize both their forces and torques to a leader (either a robot or human) that guides the group, and thus contribute positively to the transport. We introduce a custom-designed omnidirectional robot platform, called the OuijaBot, with sensing and actuation capabilities for cooperative manipulation. Our approach is verified by experiments with four OuijaBots successfully transporting and rotating a payload through a narrow corridor.
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Notes
- 1.
Even though strict centrosymmetry is hard to achieve, when the number of robots is large with respect to the size of the object, it is likely that the robots will spread evenly around the object, so that the centrosymmetry can be nearly satisfied.
- 2.
There are many off-the-shelf algorithms we can choose, and this is not the focus of this paper.
- 3.
Initial movement can be also triggered without communication using random trials [19]. For the sake of clear presentation, we skip this phase, which is not the focus of this paper.
- 4.
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Acknowledgements
This work was supported by NSF grant CNS-1330036, and also by the Toyota-SAIL Center for AI Research. The authors are grateful for this support.
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Wang, Z., Yang, G., Su, X., Schwager, M. (2018). OuijaBots: Omnidirectional Robots for Cooperative Object Transport with Rotation Control Using No Communication. In: Groß, R., et al. Distributed Autonomous Robotic Systems. Springer Proceedings in Advanced Robotics, vol 6. Springer, Cham. https://doi.org/10.1007/978-3-319-73008-0_9
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