국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	DEVELOPMENT OF THE X-33 AERODYNAMIC UNCERTAINTY MODEL
저자	Brent R. Cobleigh
Keyword	Aerodynamic uncertainty; Lifting-body aircraft; Monte Carlo simulation; Reusable
URL	http://www.dfrc.nasa.gov/DTRS/1998/PDF/H-2221.pdf
보고서번호	NASA-TP-206544
발행년도	1998
출처	NASA Dryden Flight Research Center
ABSTRACT	An aerodynamic uncertainty model for the X-33 single-stage-to-orbit demonstrator aircraft has been developed at NASA Dryden Flight Research Center. The model is based on comparisons of historical flight test estimates to preflight wind-tunnel and analysis code predictions of vehicle aerodynamics documented during six lifting-body aircraft and the Space Shuttle Orbiter flight programs. The lifting-body and Orbiter data were used to define an appropriate uncertainty magnitude in the subsonic and supersonic flight regions, and the Orbiter data were used to extend the database to hypersonic Mach numbers. The uncertainty data consist of increments or percentage variations in the important aerodynamic coefficients and derivatives as a function of Mach number along a nominal trajectory. The uncertainty models will be used to perform linear analysis of the X-33 flight control system and Monte Carlo mission simulation studies. Because the X-33 aerodynamic uncertainty model was developed exclusively using historical data rather than X-33 specific characteristics, the model may be useful for other lifting-body studies.