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Walking pattern generation for a humanoid robot with compliant joints

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Abstract

This work presents a walking pattern generator based on the control of the center of mass (COM) states and its experimental validations on the compliant humanoid robot COMAN powered by intrinsically compliant joints. To cope with the inaccuracies of the joint position tracking resulted by the physical compliance, the proposed pattern generator uses the feedback states of the COM and on-line computes the updated COM references. The position and velocity of the COM are the state variables, and the constrained ground reaction force (GRF) limited by the support polygon is the control effort to drive the real COM states to track the desired references. The frequency analysis of the COM demonstrates its low frequency spectrum that indicates the demand of a low control bandwidth which is suitable for a robot system with compliant joints. The effectiveness of the proposed gait generation method was demonstrated by the experiments performed on the COMAN robot. The experimental data such as the COM position and velocity tracking, the GRF applied on feet, the measured step length and the walking velocity are analyzed. The effect of the passive compliance is also discussed.

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Acknowledgments

This study is supported by the FP7 European project AMARSi (ICT-248311).

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Authors and Affiliations

  1. Department of Advanced Robotics, Istituto Italiano di Tecnologia, via Morego, 30, 16163 , Genoa, Italy

    Zhibin Li, Nikos G. Tsagarakis & Darwin G. Caldwell

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  1. Zhibin Li
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  2. Nikos G. Tsagarakis
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  3. Darwin G. Caldwell
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Correspondence to Zhibin Li.

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Li, Z., Tsagarakis, N.G. & Caldwell, D.G. Walking pattern generation for a humanoid robot with compliant joints. Auton Robot 35, 1–14 (2013). https://doi.org/10.1007/s10514-013-9330-7

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  • DOI: https://doi.org/10.1007/s10514-013-9330-7

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