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Quadrupedal Robotic Walking on Sloped Terrains via Exact Decomposition into Coupled Bipedal Robots

Ma, Wen-Loong and Csomay-Shanklin, Noel and Ames, Aaron D. (2020) Quadrupedal Robotic Walking on Sloped Terrains via Exact Decomposition into Coupled Bipedal Robots. In: 2020 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS). IEEE , Piscataway, NJ, pp. 4006-4011. ISBN 9781728162126. https://resolver.caltech.edu/CaltechAUTHORS:20210216-101411667

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Abstract

Can we design motion primitives for complex legged systems uniformly for different terrain types without neglecting modeling details? This paper presents a method for rapidly generating quadrupedal locomotion on sloped terrains—from modeling to gait generation, to hardware demonstration. At the core of this approach is the observation that a quadrupedal robot can be exactly decomposed into coupled bipedal robots. Formally, this is represented through the framework of coupled control systems, wherein isolated subsystems interact through coupling constraints. We demonstrate this concept in the context of quadrupeds and use it to reduce the gait planning problem for uneven terrains to bipedal walking generation via hybrid zero dynamics. This reduction method allows for the formulation of a nonlinear optimization problem that leverages low-dimensional bipedal representations to generate dynamic walking gaits on slopes for the full-order quadrupedal robot dynamics. The result is the ability to rapidly generate quadrupedal walking gaits on a variety of slopes. We demonstrate these walking behaviors on the Vision 60 quadrupedal robot; in simulation, via walking on a range of sloped terrains of 13°, 15°, 20°, 25°, and, experimentally, through the successful locomotion of 13° and 20° ~ 25° sloped outdoor grasslands.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1109/IROS45743.2020.9341181DOIArticle
ORCID:
AuthorORCID
Ma, Wen-Loong0000-0002-0115-5632
Csomay-Shanklin, Noel0000-0002-2361-1694
Ames, Aaron D.0000-0003-0848-3177
Additional Information:© 2020 IEEE. This work was supported by NSF grant 1924526 and 1923239.
Funders:
Funding AgencyGrant Number
NSFECCS-1924526
NSFCMMI-1923239
Record Number:CaltechAUTHORS:20210216-101411667
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210216-101411667
Official Citation:W. -L. Ma, N. Csomay-Shanklin and A. D. Ames, "Quadrupedal Robotic Walking on Sloped Terrains via Exact Decomposition into Coupled Bipedal Robots," 2020 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), Las Vegas, NV, USA, 2020, pp. 4006-4011, doi: 10.1109/IROS45743.2020.9341181
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108061
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Feb 2021 18:23
Last Modified:16 Feb 2021 18:23

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