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Adjustment of Home Posture of Biped Humanoid Robot Using Sensory Feedback Control

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Abstract

Humanoid robot dynamic walking is seriously affected by the initial home posture (walking ready posture). If the initial home posture is not accurate, the robot may fall down during walking despite using robust walking control algorithm. Moreover, the initial home posture of a real physical robot is slightly different at every setting because the zero position of the joint is not exactly the same. Therefore, an accurate and consistent initial home posture is essential when we compare and analyze walking control algorithms. In order to find a zero position, an incremental encoder with a limit switch or an absolute encoder such as a potentiometer can generally be used. However, the initial calibration of this method for a multi-axis humanoid robot that enables the desired initial sensor signal is difficult and time-consuming. Furthermore, it has the disadvantage that additional limit switches or absolute encoders can interfere with the design objective of compactness. Therefore, this paper describes a novel adjustment method of the home posture for a biped humanoid robot utilizing incremental encoders, an inertial sensor and force torque sensors. Four kinds of controllers are proposed for the adjustment of the home posture and adjusted offsets are measured when the outputs of the controllers have converged. Experimental results from KHR-2 show the effectiveness of the proposed adjustment algorithm.

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Authors and Affiliations

  1. Intelligent Robot Laboratory, Department of Mechanical Engineering, Myongji University, San 38-2 Namdong, Cheoin-Gu, Yongin, Gyeonggi-Do, 449-728, South Korea

    Jung-Hoon Kim

  2. HUBO Laboratory, Humanoid Robot Research Center, Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong Yuseong-gu, Daejeon, 305-701, South Korea

    Jung-Yup Kim & Jun-Ho Oh

Authors
  1. Jung-Hoon Kim
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  2. Jung-Yup Kim
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  3. Jun-Ho Oh
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Correspondence to Jung-Hoon Kim.

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Kim, JH., Kim, JY. & Oh, JH. Adjustment of Home Posture of Biped Humanoid Robot Using Sensory Feedback Control. J Intell Robot Syst 51, 421–438 (2008). https://doi.org/10.1007/s10846-007-9195-0

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  • DOI: https://doi.org/10.1007/s10846-007-9195-0

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