Shape memory alloy actuator: modeling improvements and position control using a temperature inner loop

2018 ◽  
Author(s):  
Thiago Barbosa ◽  
Jés de Jesus Fiais Cerqueira ◽  
Antonio Marcus Nogueira Lima
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Position Control ◽  
Shape Memory Alloy Actuator

Adaptive predictive control of a novel shape memory alloy rod actuator

2020 ◽  
pp. 095965182097448
Author(s):  
S Farzaneh Hoseini ◽  
S Ali MirMohammadSadeghi ◽  
Alireza Fathi ◽  
Hamidreza Mohammadi Daniali
Keyword(s):  
Control System ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Predictive Control ◽  
Smart Materials ◽  
Position Control ◽  
Least Square ◽  
Recursive Least Square ◽  
Shape Memory Alloy Actuator ◽  
Hysteresis Nonlinearity

Shape memory alloys are among the highly applicable smart materials that have recently appealed to scientists from various fields of study. In this article, a novel shape memory alloy actuator, in the form of a rod, is introduced, and an adaptive model predictive control system is designed for position control of the developed actuator. The need for such an advanced control system emanates from the fact that modeling and controlling of shape memory alloy actuators are thwarted by their hysteresis nonlinearity, dilatory response, and high dependence on environmental conditions. Real-time identification and dynamic parameter estimation of the model are addressed according to orthogonal Laguerre functions and recursive least square algorithm. In the end, the designed control system is implemented on the experimental setup of the fabricated shape memory alloy actuator. It is observed that the designed control system successfully tracks the variable step and sinusoidal control references with startling accuracy of ±1 μm.

A novel differential shape memory alloy actuator for position control

Robotica ◽  
1995 ◽  
Vol 13 (4) ◽  
pp. 423-430 ◽  
Author(s):  
Robert B. Gorbet ◽  
R. Andrew Russell
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Heat Sink ◽  
Position Control ◽  
Heat Sinks ◽  
Niti Shape Memory Alloy ◽  
Shape Memory Alloy Actuator ◽  
Loop Bandwidth ◽  
Novel Design ◽  
Position Control System

SummaryThis paper discusses a novel design for a rotary differential NiTi shape memory alloy actuator, which incorporates a mobile heat sink. The new mechanism is described in detail, and its performance in a position control system is compared with that of the same actuator without heat sink. Experimental results are presented which show an improvement in actuator response time, as well as closed-loop bandwidth. The design of the mechanism gives enhanced performance, without the increased power consumption associated with fixed heat sinks.

Controller Development for an Automotive Shape Memory Alloy Actuator

2007 ◽  
Author(s):  
Eric A. Williams ◽  
Mohammad Elahinia ◽  
Thomas M. Seigler
Keyword(s):  
Robust Control ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Real Time ◽  
Position Control ◽  
Control Performance ◽  
Control Laws ◽  
Shape Memory Alloy Actuator ◽  
Control Scheme ◽  
And Control

Shape memory alloy actuators are inherently nonlinear and require a robust control scheme to guarantee rapid tracking and sufficient position control performance. In this paper, a control scheme is developed for an automotive shape memory alloy actuator that is used to orient an external rear view mirror to match desired set-points. The formulation of appropriate models and control laws are presented. Experiments of the controller in a real-time environment are performed and results are presented.

scholarly journals Position control of a shape memory alloy actuator using a four-term bilinear PID controller

2015 ◽  
Vol 236 ◽  
pp. 257-272 ◽  
Author(s):  
Álvaro Villoslada ◽  
Naiara Escudero ◽  
Fernando Martín ◽  
Antonio Flores ◽  
Cayetano Rivera ◽  
...  
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Pid Controller ◽  
Position Control ◽  
Shape Memory Alloy Actuator
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