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9 July 1999 Improved design and performance of the SMA torque tube for the DARPA Smart Wing program
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In recent Smart Wing wind tunnel tests at NASA Langley, we demonstrated over 5 percent of span-wise twist at M equals 0.205. This was a considerable improvement over the 1.25 degree of twist demonstrated during the initial tunnel test. Key to the improvements were two developments. First a different torque loading path in the structure, which resulted in torque being directly reacted from root to wing tip. Secondly, a new SMA actuator was developed, with a measured blocking torque of 3500 +/- 100 in-lb. The second round of tunnel test not only demonstrated increased wing twist; we also were able to command a variety of twist angles and were able to show that the wing could maintain a predetermined twist for over an hour with a stability of 0.05 degrees. Power consumption was recorded, with maximum power of 200W during twisting, and a power demand of 20W for maintaining wing twist.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Peter Jardine, Jonathan D. Bartley-Cho, and John S. Flanagan "Improved design and performance of the SMA torque tube for the DARPA Smart Wing program", Proc. SPIE 3674, Smart Structures and Materials 1999: Industrial and Commercial Applications of Smart Structures Technologies, (9 July 1999);

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