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This paper addresses a path planning problem where a marsupial system is assigned to collect a specified amount of information about a set of objects of interest while minimizing the likelihood of detection by an opponent's sensor. A marsupial system consists of aircraft (agents) with different capabilities. The agents are characterized by their velocities, information collection capabilities, and...
This paper develops a rate-based model predictive controller for handling large power load transients through coordination of the engine and hybrid power subsystems in an aircraft. Simulations on a nonlinear model of a small UAV show that constraint enforcement is improved when the controller is able to coordinate the subsystems within the aircraft and anticipate changes in the power load.
The paper considers a problem of integrated thrust and electrical power management for an aircraft. An advanced configuration of the aircraft electrical power system consisting of two generators driven by the gas turbine engine is considered. A Model Predictive Controller is designed to respond to thrust and electrical load commands while maintaining system operation at high efficiency setpoints and...
Reference governors enforce pointwise-in-time state and control constraints by temporarily modifying the reference command to a nominal closed-loop system whenever the danger of constraint violation exists. In this paper we propose a reference governor with the added capability of resetting internal closed-loop system states as necessary to avoid constraint violation. With this approach the constrained...
The paper considers input observer based control of uncertain systems. A generalization of a simple input observer, that has been previously used in several automotive applications, is described and merged with a disturbance cancelation controller. The resulting control scheme enjoys semi-global practical closed-loop stability properties, i.e., under suitable assumptions it achieves an arbitrarily...
Retrospective cost model refinement is applied to on-board identification of a linearized aircraft model, and it is shown that with altitude and airspeed measurements, the aircraft stability derivatives can be estimated. These estimates are then compared to the nominal values at the same flight condition. The comparison between identified and nominal stability derivatives provides a fault signature...
Reference and command governors are predictive add-on schemes that are applied to closed-loop systems and guarantee constraint enforcement while tracking desired reference inputs. This paper introduces two methods for using these predictive methods in the presence of prioritized constraints. The first method handles the case of “soft” constraints by using a slack variable to relax the constraints...
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