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arXiv 1909.08124cs.ROcs.SYeess.SY
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基于全模型的四足机器人运动规划与控制的第一步:混合零动态方法

First Steps Towards Full Model Based Motion Planning and Control of Quadrupeds: A Hybrid Zero Dynamics Approach

California Institute of Technology(加州理工学院);Virginia Polytechnic Institute and State University(弗吉尼亚理工学院暨州立大学)

Wen-Loong Ma, Kaveh Akbari Hamed, Aaron D. Ames

摘要:

混合零动力学(HZD)方法已成为双足机器人步态规划和控制的有力工具。本文旨在扩展HZD方法,以解决四足机器人的行走,漫步和小跑行为。我们提出了一个框架,系统地产生了广泛的最佳轨迹,然后证明稳定他们的全阶,非线性和混合动力模型的四足运动。步态规划是通过一个可扩展的非线性规划,使用直接配置和HZD。然后通过Poincaré截面分析实现指数稳定的控制器综合。特别是,我们采用迭代优化算法,涉及线性和双线性矩阵不等式(LMI和BMI)设计基于HZD的控制器,保证指数稳定的不动点的庞加莱返回映射。通过步态生成和基于HZD的控制器合成的一个先进的四足机器人,-视觉60,36个状态变量和12个控制输入的框架的权力被证明。数值模拟和真实世界的实验证实了所提出的框架的有效性。

英文摘要:

The hybrid zero dynamics (HZD) approach has become a powerful tool for the gait planning and control of bipedal robots. This paper aims to extend the HZD methods to address walking, ambling and trotting behaviors on a quadrupedal robot. We present a framework that systematically generates a wide range of optimal trajectories and then provably stabilizes them for the full-order, nonlinear and hybrid dynamical models of quadrupedal locomotion. The gait planning is addressed through a scalable nonlinear programming using direct collocation and HZD. The controller synthesis for the exponential stability is then achieved through the Poincaré sections analysis. In particular, we employ an iterative optimization algorithm involving linear and bilinear matrix inequalities (LMIs and BMIs) to design HZD-based controllers that guarantee the exponential stability of the fixed points for the Poincaré return map. The power of the framework is demonstrated through gait generation and HZD-based controller synthesis for an advanced quadruped robot, ---Vision 60, with 36 state variables and 12 control inputs. The numerical simulations as well as real world experiments confirm the validity of the proposed framework.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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