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Feedback Control of Planar Biped Robot With Regulable Step Length and Walking Speed

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3 Author(s)
Yong Hu ; Asus Intelligent Systems Laboratory, College of Electrical Engineering, Zhejiang University, Hangzhou, China ; Gangfeng Yan ; Zhiyun Lin

For a compass-like biped robot, the problem of achieving stable walking on both ideal inclined surfaces and complex environments is studied. For the case of walking on ideal inclined surfaces, a feedback-control law is obtained via feedback-linearization techniques so that the trajectory of the robot converges to a desired passive walking gait. Simulations show that it leads to a larger basin of attraction. For the case of walking in complex environments, a scheme is developed with regulable step length and walking speed. Different reference trajectories are constructed for different steps, and corresponding feedback-control laws are updated at the beginning of each step. Then, it is shown that the errors that measure the difference of the response trajectory and the reference one asymptotically converge to zero. An example of walking over stairs is given to numerically verify and demonstrate our approach.

Published in:

IEEE Transactions on Robotics  (Volume:27 ,  Issue: 1 )