Modelling and gain scheduled control of shape memory alloy actuators

Author

Jayender, J. ; Patel, R.V. ; Nikumb, S. ; Ostojic, M.

Author_Institution

Dept. of Electr. & Comput. Eng., Western Ontario Univ., London, Ont.

fYear

2005

fDate

28-31 Aug. 2005

Firstpage

767

Lastpage

772

Abstract

This paper describes a gain-scheduled controller for a shape memory alloy (SMA) actuator. For accurate control of an SMA actuator, it is important to develop a precise model for the SMA. A model has been proposed based on concepts from physics. The equations include Joules heating - convectional cooling to explain the dynamics of temperature, Fermi-Dirac statistics to explain the variation of mole fraction with temperature, and a stress-strain constitutive equation to relate changes in mole fraction and temperature to changes in stress and strain of the SMA. This model is then used to develop a gain-scheduled controller to control the strain in the SMA. Simulation and experimental results show fast and accurate control of the strain in the SMA actuator

Keywords

convection; cooling; fermion systems; heating; intelligent actuators; linear quadratic control; shape control; shape memory effects; strain control; temperature control; Fermi-Dirac statistics; Joule heating; LQR optmization; convectional cooling; gain scheduled control; mole fraction; shape memory alloy actuator; stress-strain constitutive equation; temperature dynamics; Actuators; Cooling; Equations; Heating; Physics; Shape control; Shape memory alloys; Statistics; Strain control; Temperature distribution;

fLanguage

English

Publisher

ieee

Conference_Titel

Control Applications, 2005. CCA 2005. Proceedings of 2005 IEEE Conference on

Conference_Location

Toronto, Ont.

Print_ISBN

0-7803-9354-6

Type

conf

DOI

10.1109/CCA.2005.1507221

Filename

1507221