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arXiv 2106.14741cs.RO
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用于平衡变高度倒立摆的瞬时捕获输入

Instantaneous Capture Input for Balancing the Variable Height Inverted Pendulum

Southern University of Science and Technology(南方科技大学);University of Notre Dame(圣母大学)

Junwei Liu, Hua Chen, Patrick M. Wensing, Wei Zhang

摘要:

平衡是足式机器人的基本需求,因为它们的不稳定的浮基性质。由于瞬时捕获点(ICP)的概念,平衡控制已被深入研究的简单模型,如线性倒立摆,但恒定的质心高度假设限制了应用。本文通过引入\emph{instantaneous capture input}(ICI)来研究变高度倒立摆(VHIP)模型的平衡问题。也就是说,ICI可以被计算为状态的函数,并且当该函数被用作控制策略时,ICI被呈现为静止的,并且系统将最终停止。这种表征诱导了VHIP的可捕获状态的分析区域,其可用于在概念上指导步骤。为了进一步解决恢复过程中的状态和控制约束,我们提出并理论分析了一个显式ICI为基础的控制器与在线最优反馈增益。仿真结果表明,我们的控制器的有效性相比,基于运动的发散分量的方法的可捕获性维护。

英文摘要:

Balancing is a fundamental need for legged robots due to their unstable floating-base nature. Balance control has been thoroughly studied for simple models such as the linear inverted pendulum thanks to the concept of the instantaneous capture point (ICP), yet the constant center of mass height assumption limits the application. This paper explores balancing of the variable-height inverted pendulum (VHIP) model by introducing the \emph{instantaneous capture input} (ICI), an extension of the ICP based on its key properties. Namely, the ICI can be computed as a function of the state, and when this function is used as the control policy, the ICI is rendered stationary and the system will eventually come to a stop. This characterization induces an analytical region of capturable states for the VHIP, which can be used to conceptually guide where to step. To further address state and control constraints during recovery, we present and theoretically analyze an explicit ICI-based controller with online optimal feedback gains. Simulations demonstrate the validity of our controller for capturability maintenance compared to an approach based on the divergent component of motion.

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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