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Snake robot-free climbing

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1 Author(s)
Nilsson, M. ; Autonomous Learning SICS Lab., Kista, Sweden

Autonomous snake robot locomotion in rough terrain depends on the robot's ability to rise from a horizontal position to a vertical, for its ability to climb obstacles. At first sight, lifting N body segments seems to require O(N2) dynamic torque. However, in this article we describe a practical algorithm that requires only O(1) dynamic torque. The algorithm is applicable to a wide range range of snake robot morphologies. The algorithm requires little space, and control is simple, since motion occurs only in a plane. Analysis of the algorithm reveals a strong relation between the maximum dynamic torque required and the joint pitch range. We discuss some consequences for the design of snake robots. For instance, an adjustment of the mass center of the robot's end segment can reduce the maximum dynamic torque. Implications are studied for some snake robot joint designs, including Dragon, an autonomous snake robot constructed for the study of unconventional locomotion

Published in:

Control Systems, IEEE  (Volume:18 ,  Issue: 1 )

Date of Publication:

Feb 1998

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