A Variable Stiffness Spar (VSS) Approach for Aircraft Maneuver Enhancement

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$99,812.00
Award Year:
1998
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
40965
Agency Tracking Number:
40965
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
7430 E. STETSON DRIVE, Scottsdale, AZ, 85251
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Ping Chih Chen
(602) 945-9198
Business Contact:
() -
Research Institute:
n/a
Abstract
An 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.

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