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Proceedings Paper

Shape control of a morphing structure (rotor blade) using a shape memory alloy actuator system
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Paper Abstract

Development and test results of a rotor blade twist control system that utilizes a thermo-mechanical shape memory alloy (SMA) are presented. The actuation system controls the blade shape during flight operations allowing the blade to be configured for greater lift during takeoff and landing. SMA actuators provided an excellent solution because of their very high torque output to weight ratio and suitability to the dynamic environment of a rotor blade. Several challenges related to the behavior of the SMA material are overcome by innovative control system design. Thermoelectric modules (TEM's) are used to actively transfer heat between SMA tubes and other heat conductor and radiator components. Modeling and system identification techniques and a non-trivial solution to nonlinear and coupled thermal response equations are used to insure effective use of the TEM's and to improve control during SMA phase transition.

Paper Details

Date Published: 18 April 2008
PDF: 11 pages
Proc. SPIE 6928, Active and Passive Smart Structures and Integrated Systems 2008, 69282A (18 April 2008); doi: 10.1117/12.775927
Show Author Affiliations
Glenn S. Bushnell, Boeing Phantom Works (United States)
Darin Arbogast, Boeing Phantom Works (United States)
Robert Ruggeri, Boeing Phantom Works (United States)

Published in SPIE Proceedings Vol. 6928:
Active and Passive Smart Structures and Integrated Systems 2008
Mehdi Ahmadian, Editor(s)

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