High Authority Airfoil Camber Control Using Shape Memory Alloys

Award Information
Agency: Department of Defense
Branch: Air Force
Contract: N/A
Agency Tracking Number: 28187
Amount: $79,288.00
Phase: Phase I
Program: SBIR
Awards Year: 1995
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Satcon Technology Corp
161 First St, Cambridge, MA, 02142
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Ralph C Fenn Phd
 (617) 349-0185
Business Contact
Phone: () -
Research Institution
One advanced structural concept with enormous potential is the active control of wing camber. Current wing designs are compromises at all but one optimal airspeed. The capacity to alter camber as flight conditions change will provide greater lift and maneuverability, reduced dray, increased range, lower fuel consumption, and reduced operating costs. Smart materials such as magnetostrictive Terfenol-D have important advantages such as no bearings, simple construction, low maintenance, and electric operation. Past efforts using smart materials for camber control have been limited by the low energy density of the materials used. Use of shape memory alloys (SMA) has not been explored in depth. The proposed work utilizes the SMA Nitinol because it produces greater than 3% strains while competing "giant" magnetostrictive materials are limited to .15% strain (1,500 parts per million). Large control authority is the enabling feature of the SMA camber actuator. Response of SMA actuators is typically slow because of thermal effects; however, the camber actuator need react only to slow flight regime changes. Various means of SMA camber actuation are proposed including direct drive and SMA composite materials which will be fabricated. Experiments will measure the performance of SMA camber control, and in-service feasibility will be determined.

* information listed above is at the time of submission.

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