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On robot compliance. A cerebellar control approach

The work presented here is a novel biological approach for the compliant control of a robotic arm in real time (RT). We integrate a spiking cerebellar network at the core of a feedback control loop performing torque-driven control. The spiking cerebellar controller provides torque commands allowing...

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Published in:arXiv.org 2020-03
Main Authors: Abadia, Ignacio, Naveros, Francisco, Garrido, Jesus A, Ros, Eduardo, Luque, Niceto R
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creator Abadia, Ignacio
Naveros, Francisco
Garrido, Jesus A
Ros, Eduardo
Luque, Niceto R
description The work presented here is a novel biological approach for the compliant control of a robotic arm in real time (RT). We integrate a spiking cerebellar network at the core of a feedback control loop performing torque-driven control. The spiking cerebellar controller provides torque commands allowing for accurate and coordinated arm movements. To compute these output motor commands, the spiking cerebellar controller receives the robot's sensorial signals, the robot's goal behavior, and an instructive signal. These input signals are translated into a set of evolving spiking patterns representing univocally a specific system state at every point of time. Spike-timing-dependent plasticity (STDP) is then supported, allowing for building adaptive control. The spiking cerebellar controller continuously adapts the torque commands provided to the robot from experience as STDP is deployed. Adaptive torque commands, in turn, help the spiking cerebellar controller to cope with built-in elastic elements within the robot's actuators mimicking human muscles (inherently elastic). We propose a natural integration of a bio inspired control scheme, based on the cerebellum, with a compliant robot. We prove that our compliant approach outperforms the accuracy of the default factory-installed position control in a set of tasks used for addressing cerebellar motor behavior: controlling six degrees of freedom (DoF) in smooth movements, fast ballistic movements, and unstructured scenario compliant movements.
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subjects Actuators
Adaptive control
Cerebellum
Commands
Controllers
Degrees of freedom
Feedback control
Modulus of elasticity
Muscles
Robot arms
Robot control
Robots
Spiking
Time dependence
Torque
title On robot compliance. A cerebellar control approach
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