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Our papers on using origami for energy storage in dynamic robot locomotion were accepted to ICRA and RoboSoft!
Abstract: Origami robots are well-suited for jumping maneuvers because of their light weight and ability to incorporate actuation and control strategies directly into the robot body. However, existing origami robots often model fold patterns as rigidly foldable and fail to take advantage of deformation in an origami sheet for potential energy storage. In this paper, we consider a parametric origami tessellation, the Reconfigurable Expanding Bistable Origami (REBO) pattern, which leverages face deformations to act as a nonlinear spring. We present a pseudo-rigid-body model for the REBO for computing its energy stored when compressed to a given displacement and compare that model to experimental measurements taken on a mechanical testing system. This stored potential energy, when released quickly, can cause the pattern to jump. Using our model and experimental data, we design and fabricate a jumping robot, REBOund, that uses the spring-like REBO pattern as its body. Four lightweight servo motors with custom release mechanisms allow for quick compression and release of the origami pattern, allowing the fold pattern to jump over its own height even when carrying 5 times its own weight in electronics and power. We further demonstrate that small geometric changes to the pattern allow us to change the jump height without changing the actuation or control mechanism.
Abstract: We report on experiments with a laptop-sized (0.23m, 2.53kg), paper origami robot that exhibits highly dynamic and stable two degree-of-freedom (circular boom) hopping at speeds in excess of 1.5 bl/s (body-lengths per second) at a specific resistance O(1) while achieving aerial phase apex states 25% above the stance height over thousands of cycles. Three conventional brushless DC motors load energy into the folded paper springs through pulley-borne cables whose sudden loss of tension upon touchdown triggers the release of spring potential that accelerates the body back through liftoff to flight with a 20W powerstroke, whereupon the toe angle is adjusted to regulate fore-aft speed. We also demonstrate in the vertical hopping mode the transparency of this actuation scheme by using proprioceptive contact detection with only motor encoder sensing. The combination of actuation and sensing shows potential to lower system complexity for tendon-driven robots.
The GRASP Lab is excited to be hosting the Northeast Robotics Colloquium this year on October 12, 2019! See https://nerc.seas.upenn.edu/ for more details on abstract submission, registration, and other logistics.
We’re excited to announce a workshop on Robot Design and Customization: Opportunities at the Intersection of Computation and Digital Fabrication at ICRA 2019. The workshop will bring together the robotics, rapid fabrication, and computational design communities to discuss the challenges and opportunities in custom robot design, focusing on two major questions:
- How can computational approaches enhance workflow and facilitate the design and rapid prototyping of robots?
- How can new materials and manufacturing approaches lead to uniform processes for fabricating robots on-demand?
We are looking for interested participants to submit 2-page abstracts for short presentations or posters. Check out this website for more details.
We look forward to seeing you in Montreal!