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A stability locomotion-control strategy for quadruped robots with center-of-mass dynamic planning

基于质心动态规划的四足机器人稳定运动控制策略

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Abstract

Locomotion stability is essential for controlling quadruped robots and adapting them to unstructured terrain. We propose a control strategy with center-of-mass (CoM) dynamic planning for the stable locomotion of these robots. The motion trajectories of the swing legs are synchronized with the CoM of the robot. To implement the synchronous control scheme, we adjusted the swing legs to form a support triangle. The strategy is applicable to both static walk gait and dynamic trot gait. In the motion control processes of the robot legs, the distribution of the ground reaction forces is optimized to minimize joint torque and locomotion energy consumption. We also used an improved joint-torque controller with varied controller coefficients in the stance and swing phases. The simulation and experimental results demonstrate that the robot can complete omnidirectional locomotion in both walk and trot gaits. At a given locomotion speed, the stability margins for the robot during walking and trotting were 27.25% and 37.25% higher, respectively, than in the scheme without CoM planning. The control strategy with energy consumption optimization (ECO) reduced the energy consumption of the robot in walk and trot gaits by 11.25% and 13.83%, respectively, from those of the control scheme without ECO.

摘要

目的

运动稳定性对于四足机器人至关重要,是其适应非结构化地形的前提。为了提高机器人在运动过程中的机体稳定性,文本提出一种基于质心动态规划的四足机器人稳定控制策略。

创新点

1. 在期望速度一定的情况下,同时考虑机器人运动的稳定性和能耗两个问题;2. 考虑到机器人机身与各条腿之间的运动协调性问题,设计质心移动与摆动相动作的同步配合方案,并对质心进行实时轨迹规划。

方法

1. 为了实现同步控制方案,用摆动腿和支撑腿共同构成支撑三角形,并在静步态基础上对小跑步态做出扩展;2. 结合机器人腿在站立和摆动阶段受力情况的不同,设计主力矩由优化的足端反力映射和关节比例微分控制器组成的变权重控制策略。

结论

1. 仿真和实验结果表明,采用本文提出的控制策略,机器人可以完成行走和小跑两种步态的全向运动;2. 在一定的运动速度下,机器人行走和小跑的稳定裕度分别比未进行质心规划的方案提高了27.25%和37.25%;3. 与未进行能耗优化控制的方案相比,采用所提策略的机器人的能耗分别降低了11.25%(行走)和13.83%(小跑)。

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Nos. 52175050 and 52205059), the Outstanding Youth Science Foundation (No. 51922093), the Scientific Research Fund of Zhejiang Provincial Education Department (No. Y202148352), and the Graduate Innovation Special Fund Project of Jiangxi Province (No. YC2021-B031), China.

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Authors and Affiliations

Authors

Contributions

Yangyang HAN designed the research. Liyu GAO and Huaizhi ZONG processed the corresponding data. Yangyang HAN and Zhenyu LU wrote the first draft of the manuscript. Feifei ZHONG helped to organize the manuscript. Guoping LIU and Junhui ZHANG revised and edited the final version.

Corresponding author

Correspondence to Zhenyu Lu  (陆振宇).

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Conflict of interest

Yangyang HAN, Guoping LIU, Zhenyu LU, Huaizhi ZONG, Junhui ZHANG, Feifei ZHONG, and Liyu GAO declare that they have no conflict of interest.

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Han, Y., Liu, G., Lu, Z. et al. A stability locomotion-control strategy for quadruped robots with center-of-mass dynamic planning. J. Zhejiang Univ. Sci. A 24, 516–530 (2023). https://doi.org/10.1631/jzus.A2200310

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  • DOI: https://doi.org/10.1631/jzus.A2200310

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