Adaptive hysteresis compensation for SMA actuators with stress-induced variations in hysteresis

The strain-temperature hysteresis for shape memory alloy (SMA) actuators ha s been shown to undergo large changes according to the applied load. This p aper provides an adaptive hysteresis model capable of accounting for a time -varying hysteresis, specifically SMA hysteresis under a varying applied st ress. Previous research has established excellent performance, in both nume rical and laboratory experiments, of the adaptive hysteresis model for actu ators with fixed hysteresis. In this paper, the performance of the adaptive model when there are significant changes in the hysteresis characteristics is examined in a laboratory tracking experiment.