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3 April 2008 Force control of a shape memory alloy wire using fuzzy controller
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An experimental setup is designed and fabricated to measure the force induced by voltage in an SMA wire. Using autoregressive model with exogenous input (ARX) method for system identification of the experimental data, two appropriate transfer functions of the force in SMA wire versus the applied voltage during each of heating and cooling processes were derived. Afterwards, a conventional PID controller and a self-tuning fuzzy PID controller were designed to control the force in SMA wire. The latter control algorithm is used by tuning the parameters of the PID controller thereby integrating fuzzy inference and producing a fuzzy adaptive PID controller, which is used to improve the force control performance. The responses of the system with the both designed controllers for different inputs are simulated and compared to each other. At the end, simulation results show that in force control of the SMA wire, self-tuning fuzzy PID controllers are more efficient than conventional PID controllers.
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Omid Rohani, Aghil Yousefi-Koma, Ayyoub Rezaeeian, and Alireza Doosthoseini "Force control of a shape memory alloy wire using fuzzy controller", Proc. SPIE 6926, Modeling, Signal Processing, and Control for Smart Structures 2008, 692611 (3 April 2008);

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