论文信息 - Improved design and performance of the SMA torque tube for the DARPA Smart Wing program

Improved design and performance of the SMA torque tube for the DARPA Smart Wing program

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.

Jonathan D. Bartley-Cho | A. Peter Jardine | John S. Flanagan | A. Jardine | J. Flanagan

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