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arXiv 2008.00376cs.RO
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基于自适应神经网络控制器的三维不确定双足步行机器人速度调节

Velocity Regulation of 3D Bipedal Walking Robots with Uncertain Dynamics Through Adaptive Neural Network Controller

Ohio State University(俄亥俄州立大学);National Research Council of Canada(加拿大国家研究委员会);University of Waterloo(滑铁卢大学);Southern University of Science and Technology(南方科技大学)

Guillermo A. Castillo, Bowen Weng, Terrence C. Stewart, Wei Zhang, Ayonga Hereid

摘要:

提出了一种基于神经网络的自适应反馈控制结构,用于在动力学不确定性条件下对3D双足机器人进行速度调节。现有的基于混合零动态(HZD)的控制器通过实施启发式调节器来调节速度,该调节器不考虑模型和环境不确定性,这可能会显着影响控制器的跟踪性能。在本文中,我们解决的不确定性,在机器人动力学的虚拟约束的降维表示的角度来看,并提出了一个自适应神经网络为基础的控制器,以调节机器人的速度在模型参数的不确定性的存在下,集成。所提出的方法产生动态不确定性下的跟踪性能改善。本文中使用的浅层自适应神经网络不需要事先训练,并有可能在实时机器人控制器上实现。一个3D Cassie机器人的比较仿真研究,以说明所提出的方法在各种情况下的性能。

英文摘要:

This paper presents a neural-network based adaptive feedback control structure to regulate the velocity of 3D bipedal robots under dynamics uncertainties. Existing Hybrid Zero Dynamics (HZD)-based controllers regulate velocity through the implementation of heuristic regulators that do not consider model and environmental uncertainties, which may significantly affect the tracking performance of the controllers. In this paper, we address the uncertainties in the robot dynamics from the perspective of the reduced dimensional representation of virtual constraints and propose the integration of an adaptive neural network-based controller to regulate the robot velocity in the presence of model parameter uncertainties. The proposed approach yields improved tracking performance under dynamics uncertainties. The shallow adaptive neural network used in this paper does not require training a priori and has the potential to be implemented on the real-time robotic controller. A comparative simulation study of a 3D Cassie robot is presented to illustrate the performance of the proposed approach under various scenarios.

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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