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Power-optimized Stiffness and Nonlinear Position Control of an Actuator with Variable Torsion Stiffness

Beckerle, P. and Wojtusch, Janis and Schuy, J. and Strah, B. and Rinderknecht, Stephan and Stryk, Oskar von (2013):
Power-optimized Stiffness and Nonlinear Position Control of an Actuator with Variable Torsion Stiffness.
In: IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM), [Conference or Workshop Item]

Abstract

Introducing compliant actuation to robotic joints is an approach to ensure safety in closer human-machine interaction. Further, the possibility to adjust stiffness can be benificial considering energy storage and the power consumption required to track certain trajectories. The subject of this paper is the stiffness and position control of the Variable Torsion Stiffness (VTS) actuator for application in compliant robotic joints. For the realization of a variable rotational stiffness, the active length of a torsional elastic element in serial configuration between drive and link is adjusted in VTS. After the deduction of an extended drive train model, this paper gives an advanced power analysis clarifying power-optimal settings from previous basic models and identifying additional settings that allow for a more versatile operation. Based on these results that can be generalized to other variable elastic actuator concepts, an optimized strategy for setting stiffness is determined considering the whole system dynamics including natural frequencies as well as antiresonance effects. For position control of VTS in a prototypical implementation, a nonlinear position controller is designed by means of feedback linearization. Although the system is modified significantly by changing drive train stiffness, the stiffness adaptation of the controller ensures the required tracking performance.

Item Type: Conference or Workshop Item
Erschienen: 2013
Creators: Beckerle, P. and Wojtusch, Janis and Schuy, J. and Strah, B. and Rinderknecht, Stephan and Stryk, Oskar von
Title: Power-optimized Stiffness and Nonlinear Position Control of an Actuator with Variable Torsion Stiffness
Language: English
Abstract:

Introducing compliant actuation to robotic joints is an approach to ensure safety in closer human-machine interaction. Further, the possibility to adjust stiffness can be benificial considering energy storage and the power consumption required to track certain trajectories. The subject of this paper is the stiffness and position control of the Variable Torsion Stiffness (VTS) actuator for application in compliant robotic joints. For the realization of a variable rotational stiffness, the active length of a torsional elastic element in serial configuration between drive and link is adjusted in VTS. After the deduction of an extended drive train model, this paper gives an advanced power analysis clarifying power-optimal settings from previous basic models and identifying additional settings that allow for a more versatile operation. Based on these results that can be generalized to other variable elastic actuator concepts, an optimized strategy for setting stiffness is determined considering the whole system dynamics including natural frequencies as well as antiresonance effects. For position control of VTS in a prototypical implementation, a nonlinear position controller is designed by means of feedback linearization. Although the system is modified significantly by changing drive train stiffness, the stiffness adaptation of the controller ensures the required tracking performance.

Title of Book: IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM)
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Mechatronic Systems in Mechanical Engineering (IMS)
20 Department of Computer Science
20 Department of Computer Science > Simulation, Systems Optimization and Robotics Group
Interdisziplinäre Forschungsprojekte
Interdisziplinäre Forschungsprojekte > Forschungsprojekte Prothetik
Date Deposited: 20 Jun 2016 23:26
Identification Number: BeckerleAIM:2013
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