TY - GEN
T1 - Control-relevant modeling, analysis, and design for scramjet-powered hypersonic vehicles
AU - Rodriguez, Armando
AU - Dickeson, Jeffrey J.
AU - Sridharan, Srikanth
AU - Korad, Akshay
AU - Khatri, Jaidev
AU - Benavides, Jose
AU - Soloway, Don
AU - Kelkar, Atul
AU - Vogel, Jerald M.
PY - 2009/12/1
Y1 - 2009/12/1
N2 - Within this paper, control-relevant vehicle design concepts are examined using a widely used 3 DOF (plus flexibility) nonlinear model for the longitudinal dynamics of a generic carrot-shaped scramjet powered hypersonic vehicle. Trade studies associated with vehicle/engine parameters are examined. The impact of parameters on control-relevant static properties (e.g. level-flight trimmable region, trim controls, AOA, thrust margin) and dynamic properties (e.g. instability and right half plane zero associated with flight path angle) are examined. Specific parameters considered include: inlet height, diffuser area ratio, lower forebody compression ramp inclination angle, engine location, center of gravity, and mass. Vehicle optimizations is also examined. Both static and dynamic considerations are addressed. The gap-metric optimized vehicle is obtained to illustrate how this control-centric concept can be used to "reduce" scheduling requirements for the final control system. A classic inner-outer loop control architecture and methodology is used to shed light on how specific vehicle/engine design parameter selections impact control system design. In short, the work represents an important first step toward revealing fundamental tradeoffs and systematically treating control-relevant vehicle design.
AB - Within this paper, control-relevant vehicle design concepts are examined using a widely used 3 DOF (plus flexibility) nonlinear model for the longitudinal dynamics of a generic carrot-shaped scramjet powered hypersonic vehicle. Trade studies associated with vehicle/engine parameters are examined. The impact of parameters on control-relevant static properties (e.g. level-flight trimmable region, trim controls, AOA, thrust margin) and dynamic properties (e.g. instability and right half plane zero associated with flight path angle) are examined. Specific parameters considered include: inlet height, diffuser area ratio, lower forebody compression ramp inclination angle, engine location, center of gravity, and mass. Vehicle optimizations is also examined. Both static and dynamic considerations are addressed. The gap-metric optimized vehicle is obtained to illustrate how this control-centric concept can be used to "reduce" scheduling requirements for the final control system. A classic inner-outer loop control architecture and methodology is used to shed light on how specific vehicle/engine design parameter selections impact control system design. In short, the work represents an important first step toward revealing fundamental tradeoffs and systematically treating control-relevant vehicle design.
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M3 - Conference contribution
AN - SCOPUS:77958531323
SN - 9781600867408
T3 - 16th AIAA/DLR/DGLR International Space Planes and Hypersonic Systems and Technologies Conference
BT - 16th AIAA/DLR/DGLR International Space Planes and Hypersonic Systems and Technologies Conference
T2 - 16th AIAA/DLR/DGLR International Space Planes and Hypersonic Systems and Technologies Conference
Y2 - 19 October 2009 through 22 October 2009
ER -