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Control approach for a novel high power-to-weight ratio SMA muscle scalable in force and length

Kratz, R. and Stelzer, Maximilian and Friedmann, Martin and Stryk, Oskar von (2007):
Control approach for a novel high power-to-weight ratio SMA muscle scalable in force and length.
In: 2007 IEEE/ASME International Conference on Advanced Intelligent Mechatronics : Zurich, Switzerland, 4 - 7 September 2007.-Piscataway, NJ : IEEE Service Center, 2007.-ISBN 1-424-41263-3, 978-1-424-41263-1, Zürich, CH, [Conference or Workshop Item]

Abstract

The development of a control approach for a novel, soundless, lightweight and multifunctional shape memory alloy (SMA) actuator scalable in force and length for personal assistance or home-help robots is presented in this paper. The SMA actuator is based on lightweight bundles of thin wires of prestrained shape memory alloy that change their length when heated above their transformation temperature. The design approach of the actuator allows arranging the point of actuation in any direction and ensures a short cool down time to guarantee a frequency of contraction/stress cycles that is high enough to allow fast joint motions. This is needed for the generation of fast joint motions. For the use of the actuator the novel control approach has been experimentally validated. The approach uses the resistance of the actuator as a linear position encoder and there are no additional external sensors needed. The application of the new actuator to a novel lightweight humanoid robot is outlined. One advantage of the actuator over electric motors lies in the large variety of user-defined points of actuation of the in pull-force and length free scalable actuators and the high power-to-weight ratio. The results demonstrate that it is possible to build a large humanoid robot actuated with SMA actuator in a new way.

Item Type: Conference or Workshop Item
Erschienen: 2007
Creators: Kratz, R. and Stelzer, Maximilian and Friedmann, Martin and Stryk, Oskar von
Title: Control approach for a novel high power-to-weight ratio SMA muscle scalable in force and length
Language: English
Abstract:

The development of a control approach for a novel, soundless, lightweight and multifunctional shape memory alloy (SMA) actuator scalable in force and length for personal assistance or home-help robots is presented in this paper. The SMA actuator is based on lightweight bundles of thin wires of prestrained shape memory alloy that change their length when heated above their transformation temperature. The design approach of the actuator allows arranging the point of actuation in any direction and ensures a short cool down time to guarantee a frequency of contraction/stress cycles that is high enough to allow fast joint motions. This is needed for the generation of fast joint motions. For the use of the actuator the novel control approach has been experimentally validated. The approach uses the resistance of the actuator as a linear position encoder and there are no additional external sensors needed. The application of the new actuator to a novel lightweight humanoid robot is outlined. One advantage of the actuator over electric motors lies in the large variety of user-defined points of actuation of the in pull-force and length free scalable actuators and the high power-to-weight ratio. The results demonstrate that it is possible to build a large humanoid robot actuated with SMA actuator in a new way.

Title of Book: 2007 IEEE/ASME International Conference on Advanced Intelligent Mechatronics : Zurich, Switzerland, 4 - 7 September 2007.-Piscataway, NJ : IEEE Service Center, 2007.-ISBN 1-424-41263-3, 978-1-424-41263-1
Divisions: 20 Department of Computer Science
20 Department of Computer Science > Simulation, Systems Optimization and Robotics Group
Zentrale Einrichtungen
Event Location: Zürich, CH
Date Deposited: 18 Mar 2009 14:17
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