Dynamic modeling and sliding mode control of a five-link biped during the double support phase

2004 ◽  
Author(s):  
Xiuping Mu ◽  
Qiong Wu
Keyword(s):  
Sliding Mode Control ◽  
Dynamic Modeling ◽  
Sliding Mode ◽  
Double Support ◽  
Mode Control ◽  
Support Phase ◽  
Double Support Phase

scholarly journals Modeling and Finite-Time Walking Control of a Biped Robot with Feet

2015 ◽  
Vol 2015 ◽  
pp. 1-17 ◽  
Author(s):  
Juan E. Machado ◽  
Héctor M. Becerra ◽  
Mónica Moreno Rocha
Keyword(s):  
Sliding Mode Control ◽  
Finite Time ◽  
Sliding Mode ◽  
Biped Robot ◽  
Robot Dynamics ◽  
Local Diffeomorphism ◽  
Double Support ◽  
Finite Time Convergence ◽  
Mode Control ◽  
Support Phase

This paper addresses the problem of modeling and controlling a planar biped robot with six degrees of freedom, which are generated by the interaction of seven links including feet. The biped is modeled as a hybrid dynamical system with a fully actuated single-support phase and an instantaneous double-support phase. The mathematical modeling is detailed in the first part of the paper. In the second part, we present the synthesis of a controller based on virtual constraints, which are codified in an output function that allows defining a local diffeomorphism to linearize the robot dynamics. Finite-time convergence of the output to the origin ensures a collision between the swing foot and the ground with an appropriate configuration for the robot to give a step forward. The components of the output track adequate references that encode a walking pattern. Finite-time convergence of the tracking errors is enforced by using second-order sliding mode control. The main contribution of the paper is an evaluation and comparison of discontinuous and continuous sliding mode control in the presence of parametric uncertainty and external disturbances. The robot model and the synthesized controller are evaluated through numerical simulations.

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