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Landing Force Control for Humanoid Robot by Time-Domain Passivity Approach

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4 Author(s)
Yong-Duk Kim ; Korea Adv. Inst. of Sci. & Technol., Daejeon ; Bum-Joo Lee ; Jee-Hwan Ryu ; Jong-Hwan Kim

This paper proposes a control method to absorb the landing force or the ground reaction force for a stable dynamic walking of a humanoid robot. Humanoid robot may become unstable during walking due to the impulsive contact force of the sudden landing of its foot. Therefore, a control method to decrease the landing force is required. In this paper, time-domain passivity control approach is applied for this purpose. Ground and the foot of the robot are modeled as two one-port network systems that are connected, and exchange energy with each other. The time-domain passivity controller with admittance causality is implemented, which has the landing force as input and foot's position to trim off the force as output. The proposed landing force controller can enhance the stability of the walking robot from simple computation. The small-sized humanoid robot, HanSaRam-VII that has 27 DOFs, is developed to verify the proposed scheme through dynamic walking experiments.

Published in:

Robotics, IEEE Transactions on  (Volume:23 ,  Issue: 6 )

Date of Publication:

Dec. 2007

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