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Proceedings Paper

Design and control of a proof-of-concept variable-area exhaust nozzle using shape memory alloy actuators
Author(s): Gangbing Song; Ning Ma; Hou-Jun Lee; Steven Arnold
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Paper Abstract

There is no reported research of using shape memory alloy (SMA) actuators for variable area exhaust nozzle for a jet engine in the literature, to the authors' best knowledge. SMA actuators have the advantages of high power-to-weight ratio and can result in dramatic weight reduction as compared to hydraulic systems. However, the difficulty of using SMA actuators for controlling variable area exhaust nozzle lies in the fact that the temperature near exhaust nozzle is far higher than the transformation temperature of an SMA actuator. Due to the flexibility and small volume of SMA wire actuators, they can be remotely replaced in a region where temperature is lower than that of its transformation temperature. By exploiting this fact, this paper presents a novel design of a proof-of-concept variable area exhaust nozzle using shape memory alloy wire actuators. The SMA actuators are remotely placed away from the exhaust nozzle area so that the environmental temperature is below their transformation temperature. By electrically heating the SMA actuators, the exhaust nozzle will experience an area reduction of up to 40%. Bias springs will apply forces to return the fan nozzle to the open-up configuration. A feedback controller based sliding mode method is used to regulate the SMA actuators' position. Experimental results demonstrate that the proposed design meets the desired area variation specifications and show the promise of a lightweight and simple exhaust nozzle design by using shape memory alloy actuators.

Paper Details

Date Published: 29 July 2004
PDF: 9 pages
Proc. SPIE 5388, Smart Structures and Materials 2004: Industrial and Commercial Applications of Smart Structures Technologies, (29 July 2004); doi: 10.1117/12.543563
Show Author Affiliations
Gangbing Song, Univ. of Houston (United States)
Ning Ma, Univ. of Houston (United States)
Hou-Jun Lee, NASA Glenn Research Ctr. (United States)
Steven Arnold, NASA Glenn Research Ctr. (United States)


Published in SPIE Proceedings Vol. 5388:
Smart Structures and Materials 2004: Industrial and Commercial Applications of Smart Structures Technologies
Eric H. Anderson, Editor(s)

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