## Passive brachiation. Towards motion in trees with robotic snakes

- Andres Trujillo, Juan Igua, Kamilo Melo
- 2014 IEEE International Symposium on Safety…
- 2014

1 Excerpt

- Published 2011 in 2011 IEEE/RSJ International Conference on…

We consider a 24-degrees-of-freedom monkey robot that is supposed to perform brachiation locomotion, i.e. swinging from one row of a horizontal ladder to the next one using the arms. The robot hand is constructed as a planar hook so that the contact point about which the robot swings is a passive hinge. We identify the 10 most relevant degrees of freedom for this underactuated mechanical system and formulate a tractable search: (a) introduce a family of coordination patterns to be enforced on the dynamics with respect to a path coordinate; (b) formulate geometric equality constraints that are necessary for periodic locomotion; (c) generate trajectories from integrable reduced dynamics associated with the passive hinge; (d) evaluate the energetic cost of transport. Moreover, we observe that a linear approximation of the reduced dynamics can be used for trajectory generation which allows us to incorporate the gradient of the cost function into the search algorithm.

@article{Pchelkin2011ShapingEE,
title={Shaping energetically efficient brachiation motion for a 24-DOF gorilla robot},
author={Stepan Pchelkin and Anton S. Shiriaev and Uwe Mettin and Leonid B. Freidovich and Tadayoshi Aoyama and Zhiguo Lu and Toshio Fukuda},
journal={2011 IEEE/RSJ International Conference on Intelligent Robots and Systems},
year={2011},
pages={5094-5099}
}