geometric mechanics
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2021 ◽  
pp. 101483
Author(s):  
Yanbin Li ◽  
Xiaolei Song ◽  
Haijun Liu ◽  
Jie Yin

Author(s):  
Baxi Chong ◽  
Tianyu Wang ◽  
Bo Lin ◽  
Shengkai Li ◽  
Howie Choset ◽  
...  

2020 ◽  
Vol 39 (5) ◽  
pp. 598-616
Author(s):  
Tony Dear ◽  
Blake Buchanan ◽  
Rodrigo Abrajan-Guerrero ◽  
Scott David Kelly ◽  
Matthew Travers ◽  
...  

Conventional approaches in prescribing controls for locomoting robots assume control over all input degrees of freedom (DOFs). Many robots, such as those with non-holonomic constraints, may not require or even allow for direct command over all DOFs. In particular, a snake robot with more than three links with non-holonomic constraints cannot achieve arbitrary configurations in all of its joints while simultaneously locomoting. For such a system, we assume partial command over a subset of the joints, and allow the rest to evolve according to kinematic chained and dynamic models. Different combinations of actuated and passive joints, as well as joints with dynamic elements such as torsional springs, can drastically change the coupling interactions and stable oscillations of joints. We use tools from nonlinear analysis to understand emergent oscillation modes of various robot configurations and connect them to overall locomotion using geometric mechanics and feedback control for robots that may not fully utilize all available inputs. We also experimentally verify observations and motion planning results on a physical non-holonomic snake robot.


2020 ◽  
Vol 13 (4) ◽  
pp. ⅰ-ⅲ
Author(s):  
Thomas Hagen ◽  
◽  
Andreas Johann ◽  
Hans-Peter Kruse ◽  
Florian Rupp ◽  
...  

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