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arXiv 1406.4047eess.SYcs.ROcs.SY
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机器人阻抗控制与内力和速度反馈环的被动性分析

Robot Impedance Control and Passivity Analysis with Inner Torque and Velocity Feedback Loops

. Agile \& Dexterous Robotics Lab, ETH Z\"urich, Tannenstr. 3, 8092 Z\"urich, Switzerland

Michele Focchi, Gustavo A. Medrano-Cerda, Thiago Boaventura, Marco Frigerio, Jonas Buchli, Darwin G. Caldwell, Claudio Semini

AI总结:

本文研究了机器人阻抗控制中内力和速度反馈环对稳定性区域和系统被动性的影响,通过仿真和实验数据验证,并提出基于内力环和正速度反馈环的关节阻抗控制器设计方法。

摘要:

阻抗控制是一种用于机器人交互力控制的成熟技术。然而,实际实现中内环的阻抗控制可能面临若干限制。尽管在设计嵌套控制系统时通常通过最大化内环带宽来提高跟踪性能,但当需要渲染特定范围的阻抗参数时,这种方法可能并不合适。特别是,稳定刚度和阻尼值的可行范围可能受到内控制环(例如力环)带宽以及滤波和采样频率的强烈影响。本文对这些方面如何影响阻抗参数的稳定性区域以及系统的被动性进行了深入分析,并通过仿真和实验数据予以支持。此外,本文还提出了一种基于内力环和正速度反馈环的关节阻抗控制器设计方法。速度反馈的目标是在保持稳定性的前提下,增加力环的带宽,而无需复杂的控制器。

英文摘要:

Impedance control is a well-established technique to control interaction forces in robotics. However, real implementations of impedance control with an inner loop may suffer from several limitations. Although common practice in designing nested control systems is to maximize the bandwidth of the inner loop to improve tracking performance, it may not be the most suitable approach when a certain range of impedance parameters has to be rendered. In particular, it turns out that the viable range of stable stiffness and damping values can be strongly affected by the bandwidth of the inner control loops (e.g. a torque loop) as well as by the filtering and sampling frequency. This paper provides an extensive analysis on how these aspects influence the stability region of impedance parameters as well as the passivity of the system. This will be supported by both simulations and experimental data. Moreover, a methodology for designing joint impedance controllers based on an inner torque loop and a positive velocity feedback loop will be presented. The goal of the velocity feedback is to increase (given the constraints to preserve stability) the bandwidth of the torque loop without the need of a complex controller.

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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