The modelling and L/sub 2/-stability of a shape memory alloy position control system

Shape memory alloys (SMAs) are inherently non-linear devices exhibiting significant hysteresis in their stress-strain-temperature characteristic. As a consequence most SMA actuator systems presented in the literature employ some form of PID or PWM controller. Unfortunately, due to the hysteresis of...

Full description

Saved in:
Bibliographic Details
Published inRobotics and Automation, '94 International Conference pp. 293 - 299 vol.1
Main Authors Madill, D.R., Wang, D.
Format Conference Proceeding
LanguageEnglish
Published IEEE Comput. Soc. Press 1994
Subjects
Actuators
Computer simulation
Control system analysis
Control systems
Hysteresis
Position control
Pulse width modulation
Shape memory alloys
Stability
Three-term control
Online AccessGet full text
ISBN9780818653308
0818653302
DOI10.1109/ROBOT.1994.350975

Cover

More Information
Summary:Shape memory alloys (SMAs) are inherently non-linear devices exhibiting significant hysteresis in their stress-strain-temperature characteristic. As a consequence most SMA actuator systems presented in the literature employ some form of PID or PWM controller. Unfortunately, due to the hysteresis of the SMA, the theoretical stability of these systems has been largely ignored. This paper extends the work of Ikuta et al. (1991) to arrive at a new model of an SMA actuator. The model is then used to prove the L/sub 2/-stability of a position control system. The key feature of the model is its ability to model minor hysteresis loops. The model is suitable for computer simulation and control system analysis. The stability result accounts for the complex non-linear behaviour of the SMA actuator, along with non-linear effects such as saturation.< >
ISBN:9780818653308
0818653302
DOI:10.1109/ROBOT.1994.350975