Guidance Command Generation and Nonlinear Dynamic Inversion Control for Reusable Launch Vehicles
- Paper number
IAC-18,C1,5,12,x47165
- Author
Mr. Paul Acquatella B., Germany, DLR, German Aerospace Center
- Coauthor
Ms. Lâle Evrim Briese, Germany, DLR, German Aerospace Center
- Coauthor
Dr. Klaus Schnepper, Germany, DLR (German Aerospace Center)
- Year
2018
- Abstract
Future launch vehicle concepts and technologies for expendable and reusable launch vehicles are currently investigated by the DLR research projects \textsc{Akira} and \textsc{X-tras}. In particular, the winged \textit{Liquid Fly-back Booster} concept \textsc{Lfbb} based on an LOX/LH2 propellant combination for vertical takeoff and vertical landing (VTVL), as well as the delta-winged horizontal takeoff and horizontal landing (HTHL) concept \textsc{Aurora} based on an LOX/Kerosene propellant combination are considered in these projects. Because of the complexity and risks involved in on-line trajectory optimization, off-line reference trajectories are still considered important for tracking purposes. In that sense, the goal of this paper is to investigate an off-line and general-purpose guidance and control (G\&C) architecture for preliminary studies of reusable launch vehicles. This is done by using trajectory optimization combined with \textsc{Modelica} models for the generation of optimal guidance commands, and then trajectory tracking is performed by means of inner-loop feedback controls in terms of nonlinear dynamic inversion with prescribed desired dynamics. We showcase the advantages of this baseline G\&C architecture in terms of early stability and controllability aspects during the preliminary design studies of an example configuration of a reusable launch vehicle investigated in the context of the research projects above mentioned.- Abstract document
- Manuscript document
IAC-18,C1,5,12,x47165.pdf (🔒 authorized access only).
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