국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	ESTIMATED BENEFITS OF VARIABLE-GEOMETRY WING CAMBER CONTROL FOR TRANSPORT AIRCRAFT.
저자	Alexander Bolonkin and Glenn B. Gilyard
Keyword	Adaptive control; Aircraft performance; Cambered wings; Commercial aircraft; Lift-to-Drag ratio; Optimization; Variable-camber wing.
URL	http://www.dfrc.nasa.gov/DTRS/1999/PDF/H-2368.pdf
보고서번호	NASA-TM-1999-206586
발행년도	1999
출처	NASA Dryden Flight Research Center
ABSTRACT	Analytical benefits of variable-camber capability on subsonic transport aircraft are explored. Using aerodynamic performance models, including drag as a function of deflection angle for control surfaces of interest, optimal performance benefits of variable camber are calculated. Results demonstrate that if all wing trailing-edge surfaces are available for optimization, drag can be significantly reduced at most points within the flight envelope. The optimization approach developed and illustrated for flight uses variable camber for optimization of aerodynamic efficiency (maximizing the lift-to-drag ratio). Most transport aircraft have significant latent capability in this area. Wing camber control that can affect performance optimization for transport aircraft includes symmetric use of ailerons and flaps. In this paper, drag characteristics for aileron and flap deflections are computed based on analytical and wind-tunnel data. All calculations based on predictions for the subject aircraft and the optimal surface deflection are obtained by simple interpolation for given conditions. An algorithm is also presented for computation of optimal surface deflection for given conditions. Benefits of variable camber for a transport configuration using a simple trailing-edge control surface system can approach more than 10 percent, especially for nonstandard flight conditions. In the cruise regime, the benefit is 1? percent.