Improvement of the performance of hysteresis compensation in SMA actuators by using inverse Preisach model in closed — loop control system |
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Authors: | Kyoung Kwan Ahn Nguyen Bao Kha |
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Affiliation: | 1. School of Mechanical and Automotive Engineering, University of Ulsan, San 29, Muger 2dong, Namgu, 680-764, Ulsan, Korea 2. Graduate School of Mechanical and Automotive Engineering, University of Ulsan, San 29, Muger 2dong, Namgu, 680-764, Ulsan, Korea
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Abstract: | The aim of this paper is to increase the performance of hysteresis compensation for Shape Memory Alloy (SMA) actuators by
using inverse Preisach model in closed — loop control system. This is used to reduce hysteresis effects and improve accuracy
for the displacement of SMA actuators. Firstly, hysteresis is identified by numerical Preisach model implementation. The geometrical
interpretation from first order transition curves is used for hysteresis modeling. Secondly, the inverse Preisach model is
formulated and incorporated in closed-loop PID control system in order to obtain desired current-to-displacement relationship
with hysteresis reducing. The experimental results for hysteresis compensation by using this method are also shown in this
paper. |
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