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Volume 4 Issue 4
Oct.  2017

IEEE/CAA Journal of Automatica Sinica

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Article Navigation >  IEEE/CAA Journal of Automatica Sinica  > 2017  >  4(4): 714-723
Ningbo Yu, Wulin Zou, Wen Tan and Zhuo Yang, "Augmented Virtual Stiffness Rendering of a Cable-driven SEA for Human-Robot Interaction," IEEE/CAA J. Autom. Sinica, vol. 4, no. 4, pp. 714-723, Oct. 2017. doi: 10.1109/JAS.2017.7510637
Citation: Ningbo Yu, Wulin Zou, Wen Tan and Zhuo Yang, "Augmented Virtual Stiffness Rendering of a Cable-driven SEA for Human-Robot Interaction," IEEE/CAA J. Autom. Sinica, vol. 4, no. 4, pp. 714-723, Oct. 2017. doi: 10.1109/JAS.2017.7510637
shu

Augmented Virtual Stiffness Rendering of a Cable-driven SEA for Human-Robot Interaction

doi: 10.1109/JAS.2017.7510637

  • Institute of Robotics and Automatic Information Systems, Nankai University, and Tianjin Key Laboratory of Intelligent Robotics, Nankai University, Haihe Education Park, Tianjin 300353, China

Funds:

the National Natural Science Foundation of China 61403215

he National Natural Science Foundation of Tianjin 13JCYBJC36600

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    Abstract
  • Human-robot interaction (HRI) is fundamental for human-centered robotics, and has been attracting intensive research for more than a decade. The series elastic actuator (SEA) provides inherent compliance, safety and further benefits for HRI, but the introduced elastic element also brings control difficulties. In this paper, we address the stiffness rendering problem for a cable-driven SEA system, to achieve either low stiffness for good transparency or high stiffness bigger than the physical spring constant, and to assess the rendering accuracy with quantified metrics. By taking a velocity-sourced model of the motor, a cascaded velocity-torque-impedance control structure is established. To achieve high fidelity torque control, the 2-DOF (degree of freedom) stabilizing control method together with a compensator has been used to handle the competing requirements on tracking performance, noise and disturbance rejection, and energy optimization in the cable-driven SEA system. The conventional passivity requirement for HRI usually leads to a conservative design of the impedance controller, and the rendered stiffness cannot go higher than the physical spring constant. By adding a phase-lead compensator into the impedance controller, the stiffness rendering capability was augmented with guaranteed relaxed passivity. Extensive simulations and experiments have been performed, and the virtual stiffness has been rendered in the extended range of 0.1 to 2.0 times of the physical spring constant with guaranteed relaxed passivity for physical humanrobot interaction below 5 Hz. Quantified metrics also verified good rendering accuracy.

     

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