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A Unified Motion Generation Approach for Quadruped L-S Walk and Trot Gaits Based on Linear Model Predictive Control

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Abstract

The goal of this paper is to develop a unified online motion generation scheme for quadruped lateral-sequence walk and trot gaits based on a linear model predictive control formulation. Specifically, the dynamics of the linear pendulum model is formulated over a predictive horizon by dimensional analysis. Through gait pattern conversion, the lateral-sequence walk and trot gaits of the quadruped can be regarded as unified biped gaits, allowing the dynamics of the linear inverted pendulum model to serve quadruped motion generation. In addition, a simple linearization of the center of pressure constraints for these quadruped gaits is developed for linear model predictive control problem. Furthermore, the motion generation problem can be solved online by quadratic programming with foothold adaptation. It is demonstrated that the proposed unified scheme can generate stable locomotion online for quadruped lateral-sequence walk and trot gaits, both in simulation and on hardware. The results show significant performance improvements compared to previous work. Moreover, the results also suggest the linearly simplified scheme has the ability to robustness against unexpected disturbances.

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Data Availability Statement

The datasets generated and analyzed during the current study are not publicly available as the data also forms part of an ongoing study but are available from the corresponding author on reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 52305072 and 52122503), Natural Science Foundation of Hebei Province of China (No. E2022203095), University-Industry Collaborative Education Program (No. 220603936245709), Cultivation Project for Basic Research and Innovation of Yanshan University (No. 2021LGQN004), and Shenzhen Special Fund for Future Industrial Development (No. KJZD20230923114222045).

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Authors and Affiliations

  1. Harbin Institute of Technology, No. 92 West Dazhi Street, Harbin, 150001, Heilongjiang, China

    Yapeng Shi, Zhicheng He, Xiaokun Leng, Songhao Piao & Lining Sun

  2. Yanshan University, No. 438 West Hebei Avenue, Qinhuangdao, 066004, Hebei, China

    Yapeng Shi

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  1. Yapeng Shi
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  2. Zhicheng He
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Correspondence to Xiaokun Leng.

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Shi, Y., He, Z., Leng, X. et al. A Unified Motion Generation Approach for Quadruped L-S Walk and Trot Gaits Based on Linear Model Predictive Control. J Bionic Eng (2024). https://doi.org/10.1007/s42235-024-00533-3

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  • DOI: https://doi.org/10.1007/s42235-024-00533-3

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