Uros Kalabic

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We develop nonlinear reference governor and nonlinear model predictive control schemes for constrained spacecraft attitude control. The schemes use the nonlinear discrete-time model of spacecraft dynamics based on the Lie group variational integrator evolving on SO(3) x SO(3). The reference governor is a computationally simpler add-on to the nominal(More)
In this paper, reference and extended command governors are developed for enforcing constraints in the air path of turbo-charged gasoline engines. These governors are add-on control schemes which protect the engine from violating pointwise-in-time state and control constraints, including compressor surge and actuator limits. Several design choices based on(More)
The paper considers the application of reference governors to linear discrete-time systems with constraints on state and output variables given by functional inequalities. Properties and on-line computational procedures which facilitate the implementation of the reference governors for linear systems with convex, convex quadratic, concave, and mixed logical(More)
In this paper, a fast solver for the optimization problem arising in the nonlinear model predictive control of spacecraft attitude is developed and simulation results of its application to constrained spacecraft attitude control are presented. The solver exploits the numerical solution of the necessary conditions for optimality in a discrete-time optimal(More)
This note provides a solution to the constrained command tracking problem using reference governors for a class of continuous-time second order linear systems with an input delay and with pointwise-intime state and control constraints. The reference governormodifies the command to a closed-loop system based on the prediction ofwhether the system response to(More)
We propose a Model Predictive Control (MPC) policy for simultaneous station keeping and momentum management of a low-thrust nadir-pointing satellite in geostationary orbit around the Earth. The satellite is equipped with six electrically powered thrusters and three axisymmetric reaction wheels, which must be coordinated to control the satellite’s orbital(More)