Inverse hysteresis control for shape memory alloy micro-actuators based flap positioning system

2010 ◽  
Author(s):  
Ying Feng ◽  
Camille Alain Rabbath ◽  
Henry Hong ◽  
Chun-Yi Su ◽  
Wei Lin
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Positioning System ◽  
Micro Actuators ◽  
Hysteresis Control ◽  
Inverse Hysteresis

Modeling of Shape Memory Alloy Actuators Using Matlab and dSpace Platform

2010 ◽  
Vol 166-167 ◽  
pp. 149-154
Author(s):  
Ioan Adrian Cosma ◽  
Vistrian Măties ◽  
Ciprian Lapusan ◽  
Rares Ciprian Mîndru
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Dynamic Model ◽  
Dynamic Equations ◽  
Control Technique ◽  
Positioning System ◽  
Unknown Parameters ◽  
New Approach ◽  
Model Based Control ◽  
Input And Output

The aim of the paper is to describe an approach for modeling the dynamic behavior of a positioning system actuated by two shape memory alloy springs, placed in opposition. The mathematical analysis of the system in order to develop the dynamic model is difficult in this case because of the unknown parameters within the dynamic equations (thermodynamics, change in austenite fraction) and therefore a new approach is presented. Thus, a positioning system is considered, and its behavior is determined using Matlab Software, D-space platform and an optical sensor, which analyses the position/velocity of the moving cart. The dynamic model of the system is determined in order to develop a further model based control technique. The model is generated using system identification toolbox within Matlab and input and output (response) of the considered system.

Simulation on Uniaxial-Tension Behavior of NiTi Shape Memory Alloy Films

2009 ◽  
Vol 79-82 ◽  
pp. 1209-1212
Author(s):  
Shuang Shuang Sun ◽  
Jing Dong
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Uniaxial Tension ◽  
Theoretical Foundation ◽  
Quantitative Description ◽  
Experimental Results ◽  
Niti Shape Memory Alloy ◽  
Alloy Films ◽  
Actuation Mechanism ◽  
Micro Actuators

Based on experimental results reported in the reference, Liang-Rogers’ constitutive model for SMA is used to simulate the stress-strain curves of NiTi shape memory alloy films under uniaxial tension with isothermal conditions. The effects of film compositions and temperature on the tensile behavior of NiTi shape memory alloy films are discussed. By comparing the simulation results with the experimental results, it is found that the simulation curves agree basically with the experimental curves except that the phase-transformation regions are wider in the simulation curves. This demonstrates that the Liang-Rogers’ model can be used to predict the thermomechanical behavior of shape memory alloy films roughly. This study provides some theoretical foundation for the quantitative description and prediction of the actuation mechanism when shape memory alloy films are used as micro-actuators.

“Monolithic Shape Memory Alloy Actuators”: A New Concept for Developing Smart Micro-Devices

1999 ◽  
Vol 604 ◽  
Author(s):  
Y. Bellouard ◽  
T. Lehnert ◽  
T. Sidler ◽  
R. Gotrhardt ◽  
R. Clavel
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Mechanical System ◽  
Design Strategy ◽  
Special Design ◽  
Friction Forces ◽  
Scale Down ◽  
Micro Actuators ◽  
Scaling Down ◽  
Micro Systems

AbstractIn micro-robotics and for micro-systems, one cannot simply scale down conventional actuators. Specific difficulties like friction forces between parts and the assembly have to be considered carefully and need a special design strategy adapted to this “micro-world”. Shape Memory Alloys (SMA) have strong potential in micro actuators. So far, most of SMA devices used the SMA material as a part of a mechanical system, which raised several problems when scaling down. In this paper, a concept of monolithic SMA micro-devices, which consists in considering the SMA as a mechanical system by itself, is presented. Several applications are shown to illustrate this concept.

Fabrication of Silicon-Based Shape Memory Alloy Micro-Actuators

1992 ◽  
Vol 276 ◽  
Author(s):  
A. David Johnson ◽  
J. D. Busch ◽  
Curtis A. Ray ◽  
Charles Sloan
Keyword(s):  
Thin Film ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Nickel Titanium ◽  
Titanium Film ◽  
Micro Electro Mechanical Systems ◽  
Actuation Mechanism ◽  
Micro Actuators ◽  
Chemical Milling ◽  
Silicon Based

ABSTRACTThin film shape memory alloy has been integrated with silicon in a new actuation mechanism for micro-electro-mechanical systems. This paper compares nickel-titanium film with other actuators, describes recent results of chemical milling processes developed to fabricate shape memory alloy micro-actuators in silicon, and describes simple actuation mechanisms which have been fabricated and tested.

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