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Generating 1-DOF limit cycle walking at target walking speed by feed-forward and feedback limit cycle control

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Abstract

We propose the feed-forward and feedback (FaF) control systems for generating the limit cycle walking at a target walking speed by the combined rimless wheel (CRW) model. The proposed FaF control systems can calculate a control input constantly based on the mathematical analysis of the current and target walking states. As a result, first, the limit cycle walking at the target walking speed is generated by numerical simulations when the walker is driven by the constant FaF control system. Second, for controlling the convergence speed, we extend the FaF control to the two-period stepwise control systems. The limit cycle walking at the target walking speed is still generated, and the convergence speed is controlled by the settling time parameter. Finally, the real-time walking state updating is considered in the FaF control systems to handle the disturbances. In this case, we find that for generating a target walking speed, a precise mathematical model is not necessary for generating the target state, but can make the control input stable and efficient.

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Authors and Affiliations

  1. School of Aerospace Engineering, Tsinghua University, 1 Tsinghua Yuan, Beijing, 100084, China

    Xuan Xiao

  2. Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Nomi, Ishikawa, 923-1292, Japan

    Fumihiko Asano

Authors
  1. Xuan Xiao
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  2. Fumihiko Asano
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Correspondence to Xuan Xiao.

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Xiao, X., Asano, F. Generating 1-DOF limit cycle walking at target walking speed by feed-forward and feedback limit cycle control. Multibody Syst Dyn 40, 155–175 (2017). https://doi.org/10.1007/s11044-017-9568-5

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  • DOI: https://doi.org/10.1007/s11044-017-9568-5

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