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arXiv 2103.00928cs.RO
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一种基于CPG的近对称丢失的敏捷通用运动框架

A CPG-Based Agile and Versatile Locomotion Framework Using Proximal Symmetry Loss

University of Aveiro(阿威罗大学);University of Porto(波尔图大学)

Mohammadreza Kasaei, Miguel Abreu, Nuno Lau, Artur Pereira, Luis Paulo Reis

摘要:

人形机器人被制造得与人类相似,但它们的运动能力在敏捷性和多功能性方面与我们相差甚远。当人类在复杂的地形上行走,或面临外部干扰时,他们会无意识地有效地结合一套策略来恢复稳定。本文解决的问题是开发一个强大的全向行走框架,这是能够产生灵活和敏捷的运动在复杂的地形。线性倒立摆模型和中央模式发生器的概念被用来开发一个闭环步行引擎,然后将其与强化学习模块相结合。该模块学习自适应地调节行走引擎参数,并生成残差以调整机器人的目标关节位置(残差物理)。此外,我们提出了一个近端对称性损失函数,以提高样本效率的近端策略优化算法,利用模型的对称性和信任域的概念。所提出的框架的有效性进行了证明,并在一组具有挑战性的模拟场景进行评估。机器人能够在不可预见的情况下概括它所学到的东西,即使在噪音和外部推动的情况下也能展示出类似人类的运动技能。

英文摘要:

Humanoid robots are made to resemble humans but their locomotion abilities are far from ours in terms of agility and versatility. When humans walk on complex terrains, or face external disturbances, they combine a set of strategies, unconsciously and efficiently, to regain stability. This paper tackles the problem of developing a robust omnidirectional walking framework, which is able to generate versatile and agile locomotion on complex terrains. The Linear Inverted Pendulum Model and Central Pattern Generator concepts are used to develop a closed-loop walk engine, which is then combined with a reinforcement learning module. This module learns to regulate the walk engine parameters adaptively, and generates residuals to adjust the robot's target joint positions (residual physics). Additionally, we propose a proximal symmetry loss function to increase the sample efficiency of the Proximal Policy Optimization algorithm, by leveraging model symmetries and the trust region concept. The effectiveness of the proposed framework was demonstrated and evaluated across a set of challenging simulation scenarios. The robot was able to generalize what it learned in unforeseen circumstances, displaying human-like locomotion skills, even in the presence of noise and external pushes.

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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