Hysteresis in shape memory alloy actuators: the control issues

Carrie A. Dickinson; Declan C. Hughes; John T. Wen

doi:10.1117/12.240826

31 May 1996 Hysteresis in shape memory alloy actuators: the control issues

Carrie A. Dickinson, Declan C. Hughes, John T. Wen

Proceedings Volume 2715, Smart Structures and Materials 1996: Mathematics and Control in Smart Structures; (1996) https://doi.org/10.1117/12.240826
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

Abstract

Shape memory alloy has been considered as an actuator for applications that require low bandwidth, high force, and large displacement. Two factors have limited the usefulness of such actuators: hysteresis and bandwidth limitation. This paper considers the hysteresis phenomenon from a control point of view. We first consider the application of the Preisach hysteresis model to describe the SMA hysteresis, and demonstrated experimentally that the two key assumptions: minor loop congruence and wiping-out property hold approximately. We then consider the feedback control of the force exerted by the SMA wire. By using a simple lumped temperature model, we argue that proportional feedback with a suitable range of gains would render the closed loop stable. This is verified experimentally in a simple experimental setup consisting of a flexible aluminum beam and to a Nitinol shape memory alloy wire that applies a bending force to the end of the beam. When the gain is chosen too high, clear instability has been observed despite the low bandwidth of this system (about 1 Hz).

Citation Download Citation

Carrie A. Dickinson, Declan C. Hughes, and John T. Wen "Hysteresis in shape memory alloy actuators: the control issues", Proc. SPIE 2715, Smart Structures and Materials 1996: Mathematics and Control in Smart Structures, (31 May 1996); https://doi.org/10.1117/12.240826

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