A Variable Stiffness Spar (VSS) Approach for Aircraft Maneuver Enhancement
Small Business Information
7430 E. STETSON DRIVE, Scottsdale, AZ, 85251
Ping Chih Chen
AbstractAn innovative variable stiffness spar (VSS) approach is proposed for the enhancement of aircraft roll performance. F/A-18 pre-roll-modification aircraft (F/A-18 PRM) is selected as the baseline aircraft for its low torsional wing stiffness and available baseline data. The F/A-18 PRM, when integrated with VSS (F-18/VSS), requires only the outboard trailing-edge aileron for roll maneuver. The present objective is to explore when and how to best apply the F-18/VSS concept and to access its payoff in terms of weight impact, maximum performance, and ease of structural integration. The success of the F-18/VSS concept relies upon optimal design of the VSS stiffness scheduling with an ample range for VSS to apply post-reversal control for best roll maneuver while satisfying strength, flutter and gust response constraints.The feasibility study of the F-18/VSS concept will be performed using a proven engineering tool called ASTROS*. ASTROS* is the enhanced version of the MDO software ASTROS with the integrated ZAERO (unified unsteady/steady aerodynamics covernig subsonic to hypersonic Mach numbers) and ASE (aeroservoelastic optimization/analysis) modules. In addition, the impact of dynamic instability on roll performance will be investigated where a trade-off study between flutter suppression by passive and active means will be performed.
* information listed above is at the time of submission.