Yee Harn Teh

Learn More
This paper describes a method for improving the speed of actuators based on shape memory alloys (SMA) by increasing the rate at which an SMA element can safely be heated. The method consists of measuring the electrical resistance of an SMA element, calculating a maximum safe heating current as a function of measured resistance, and ensuring that the actual(More)
This paper presents a new control architecture for fast, accurate force control of antagonistic pairs of shape memory alloy wires. The main components are: a differential-mode controller, which controls the output force, an anti-slack mechanism, a rapid-heating mechanism and an anti-overload mechanism. The closed-loop response is fast and accurate, even in(More)
This paper presents simulation and experimental results for closed-loop force control of single-wire shape memory alloy (SMA) actuators. The simulation uses a model derived from the frequency response analysis of SMA. Although the large-scale response has hysteresis and nonlinearities, small-signal frequency response analysis is possible on SMA wires, with(More)
Acknowledgements There are many who have made contributions, both directly and indirectly to the completion of this thesis. I would like to name a few. First of all, I would like to sincerely thank my supervisor, Dr. Roy Featherstone, whose help has been enormous and whose enthusiasm has sparked my own in this wonderful work. His ideas and suggestions had(More)
  • 1