31 May 1996 Hysteresis in shape memory alloy actuators: the control issues
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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).
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Carrie A. Dickinson, Carrie A. Dickinson, Declan C. Hughes, Declan C. Hughes, John T. Wen, 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); doi: 10.1117/12.240826; https://doi.org/10.1117/12.240826
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