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Real-time Capable Nonlinear Model Predictive Controller Design for The Upper Stage of a Launch Vehicle

Arslantas, Yunus and Oehlschlägel, Thimo (2015) Real-time Capable Nonlinear Model Predictive Controller Design for The Upper Stage of a Launch Vehicle. 30th International Symposium on Space Technology and Science, 4-10 July 2015, Kobe, Japan.

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In this paper, a real-time capable Nonlinear Model Predictive Controller (NMPC) is implemented for the attitude control of an upper stage launch vehicle with liquid propellant. A mass spring model is used as an analogy to simulate the disturbance generated by the sloshing propellant. For the implementation of the NMPC, an optimal control problem (OCP) is defined with finite time horizon. The objective function is minimized while satisfying constraints on the control inputs. The resulting OCP is transcribed using single shooting method to parametrize the control inputs using uniform discretization points. The continuous control inputs are obtained by linear interpolation. A dedicated discretization algorithm in FORTRAN is coupled with a solver which used quasi-Newton algorithm to generate solutions fast. Approximation of the Hessian matrix is used to reduce computational requirements. Furthermore, the algorithm can perform parallel computation of the derivatives of the objective function with respect to optimization variables. This results in a real-time capability of generating solutions in the order of milliseconds for each iteration. The algorithm is applied for attitude maneuver and disturbance rejection for the upper stage of a launch vehicle.

Item URL in elib:https://elib.dlr.de/97275/
Document Type:Conference or Workshop Item (Speech)
Title:Real-time Capable Nonlinear Model Predictive Controller Design for The Upper Stage of a Launch Vehicle
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Upper stage, Nonlinear model predictive controller, quasi-Newton method
Event Title:30th International Symposium on Space Technology and Science
Event Location:Kobe, Japan
Event Type:international Conference
Event Dates:4-10 July 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Leitprojekt - Forschungsverbund Oberstufe (old)
Location: Bremen
Institutes and Institutions:Institute of Space Systems
Deposited By: Arslantas, Yunus Emre
Deposited On:17 Sep 2015 11:13
Last Modified:31 Jul 2019 19:54

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