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Smart Structures and Systems   Volume 14, Number 4, October 2014, pages 643-658
Servo control of an under actuated system using antagonistic shape memory alloy
S. Sunjai Nakshatharan, K. Dhanalakshmi and D. Josephine Selvarani Ruth

Abstract     [Buy Article]
    This paper presents the design, modelling and, simulation and experimental results of a shape memory alloy (SMA) actuator based critical motion control application. Dynamic performance of SMA and its ability in replacing servo motor is studied for which the famous open loop unstable balancing ball and beam system direct driven by antagonistic SMA is designed and developed. Simulation uses the mathematical model of ball and beam structure derived from the first principles and model estimated for the SMA actuator by system identification. A PID based cascade control system consisting of two loops is designed and control of ball trajectory for various target positions with settling time as control parameter is verified experimentally. The results demonstrate the performance of SMA for a complicated i.e., under actuated, highly nonlinear unstable system, and thereby it\'s dynamic behaviour. Control strategies bring out the effectiveness of the actuator and its possible application to much more complex applications such as in aerospace control and robotics.
Key Words
    shape memory alloy; ball and beam system; dynamic behaviour; PID control; system identification
S. Sunjai Nakshatharan, K. Dhanalakshmi and D. Josephine Selvarani Ruth: Department of Instrumentation and Control Engineering, National Institute of Technology, Tiruchirappalli, India

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