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arXiv 2008.03663cs.ROcs.SYeess.SY
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基于严格频域约束的变刚度人机交互控制

Variable Stiffness Control with Strict Frequency Domain Constraints for Physical Human-Robot Interaction

Hong Kong University of Science and Technology(香港科技大学);Xeno Dynamics Co., Ltd(奇诺动力有限公司);Nankai University(南开大学)

Wulin Zou, Pu Duan, Yawen Chen, Ningbo Yu, Ling Shi

摘要:

变阻抗控制有利于人-机器人的物理交互,以提高安全性、适应性和许多其他方面。本文提出了一种严格频域约束下的增益调度变刚度控制方法。首先,为了减少保守性,我们表征和约束阻抗渲染,致动器饱和,干扰/噪声抑制和无源性的要求到他们的特定频带。这种放松是有意义的,因为交互式机器人的频率特性受到限制。其次,增益调度的方法被用来调整控制器的增益相对于所需的刚度。第三,通过非光滑优化方法对调度函数进行参数化。最后,通过仿真、实验以及与基于增益固定无源性的PID控制方法的比较,验证了该方法的有效性。

英文摘要:

Variable impedance control is advantageous for physical human-robot interaction to improve safety, adaptability and many other aspects. This paper presents a gain-scheduled variable stiffness control approach under strict frequency-domain constraints. Firstly, to reduce conservativeness, we characterize and constrain the impedance rendering, actuator saturation, disturbance/noise rejection and passivity requirements into their specific frequency bands. This relaxation makes sense because of the restricted frequency properties of the interactive robots. Secondly, a gain-scheduled method is taken to regulate the controller gains with respect to the desired stiffness. Thirdly, the scheduling function is parameterized via a nonsmooth optimization method. Finally, the proposed approach is validated by simulations, experiments and comparisons with a gain-fixed passivity-based PID method.

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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