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Numerical simulation of the activation behavior of thermal shape memory alloys

: Neugebauer, Reimund; Bucht, A.; Pagel, K.; Jung, J.

Postprint urn:nbn:de:0011-n-1342370 (682 KByte PDF)
MD5 Fingerprint: 64e360241480c172a3302202cc450d23
Copyright 2010 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Erstellt am: 29.3.2011

Brett McMickell, M. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Industrial and Commercial Applications of Smart Structures Technologies 2010 : 8-9 March 2010, San Diego, California, United States
Bellingham, WA: SPIE, 2010 (Proceedings of SPIE 7645)
ISBN: 978-0-8194-8060-6
ISBN: 978-0-8194-8066-8
Paper 76450J
Conference "Industrial and Commercial Applications of Smart Structures Technologies" <2010, San Diego/Calif.>
Conference "Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring" <2010, San Diego/Calif.>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IWU ()
shape memory alloy; modeling; control; self-sensing; automotive

Problems in using shape memory alloys (SMA) in industrial applications are often caused by the fragmentary knowledge of the complex activation behavior. To solve this problem, Fraunhofer IWU developed a Matlab®-based simulation tool to emulate the properties of a SMA wire based on the energy balance. The contained terms result of the characteristic material behavior combined with thermal, electrical, and mechanical conditions. Model validation is performed by laboratory tests. It is shown that there is almost no difference between the measured and the simulated actuator movement. Due to the good quality of the model it is possible to use it in a control loop. Knowing current and voltage enables the computation of the electrical resistance of the actuator and can therefore be used for feedback control. Implementation of the results into industrial applications is exemplified by integration of an actuator in a flap as used in air condition systems of cars. Furthermore, the SMA-based drive will be compared to an electromechanical drive.