Browsing AE Research Publications by Title
Now showing items 145-164 of 182
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A quantum neural network computes its own relative phase
(IEEE, 2013-04-17)Complete characterization of the state of a quantum system made up of subsystems requires determination of relative phase, because of interference effects between the subsystems. For a system of qubits used as a quantum ... -
Quaternion-Based Coordinates for Nonsingular modeling of high-inclination orbital transfer
(American Institute of Aeronautics and Astronautics, 2014-09)Recently, the potential of electric propulsion (EP) for orbit transfer of scientific or commercial satellites has begun to be recognized both by satellite manufacturers and providers [1,2]. The increasing interest in EP ... -
Real-time adaptive optimal prediction of safe control spaces and augmented-reality head-up displays towards aircraft loss-of-control mitigation
(American Institute of Aeronautics and Astronautics Inc, AIAA, 2021-01)Predictive systems capable of alerting pilots to impending entry into a loss-of-control event have potential to improve safety in flight. Towards this end, the General Aviation Flight Lab at Wichita State University has ... -
Real-time adaptive prediction of loss-of-control margins on a fourth order aircraft
(American Institute of Aeronautics and Astronautics Inc., 2019-01-06)Loss-of-Control events continue to be the most significant contributing factor to air accidents worldwide. Predictive systems capable of warning pilots of impending entry into control loss have the potential to further ... -
Real-time Google Glass Heads-Up Display for rapid air-traffic detection
(American Institute of Aeronautics and Astronautics, Inc., 2018-01)As airspace becomes increasingly crowded, the need for next-generation traffic-advisory systems for pilots has become more crucial. To this end, a heads-up advisory display is developed within the Google Glass platform to ... -
Regional CubeSat constellation design to monitor hurricanes
(IEEE, 2021-11-13)State-of-the-art weather forecasting systems depend on a variety of data collected by airborne, orbiting, and ground sensors. Regional CubeSat constellations have the potential to improve hurricane forecasting by collecting ... -
Reinforcement and backpropagation training for an optical neural network using self-lensing effects
(IEEE, 2000-11)The optical bench training of an optical feedforward neural network, developed by the authors, is presented. The network uses an optical nonlinear material for neuron processing and a trainable applied optical pattern as ... -
Relative equations of motion using a new set of orbital elements
(Univelt Inc., 2018)In this paper, we consider the relative equations of spacecraft motion in terms of a new set of orbital elements that includes the components of the angular momentum in the inertial reference frame, the components of the ... -
Retrofit winglets for wind turbines
(American Institute of Aeronautics and Astronautics Inc., 2019-01-06)The benefits of using winglets on wind turbines has been well documented. However, adding winglets to wind turbine blades leads to significant increases in blade root bending moments, requiring expensive structural ... -
Selecting planning horizon length for sequential low-thrust orbit-raising optimization problem
(Univelt Inc., 2019-09)In this paper, we revisit the low-thrust multi-revolution orbit-raising problem formulated as a sequence of optimal control sub-problems, each of which computes the trajectory over a planning horizon. Each sub-problem ... -
Sensor fusion of structural finite element model with inertial sensor data to measure wing deflection of a fixed wing aircraft
(American Institute of Aeronautics and Astronautics Inc, 2020-01-05)This research is a continuation of prior experimental work describing the application of sensor fusion to obtain structural wing deflection data with acceptable accuracy. A Kalman filter design is described introducing a ... -
Sequential low-thrust orbit-raising of all-electric satellites
(MDPI Multidisciplinary Digital Publishing Institute, 2020-06-04)In this paper, we consider a recently developed formulation of the electric orbit-raising problem that utilizes a novel dynamic model and a sequence of optimal control sub-problems to yield fast and robust computations of ... -
Simulated flight testing of an adaptive loss-of-control avoidance pilot advisory display
(American Institute of Aeronautics and Astronautics Inc., 2019-01-06)Loss-of-Control has been consistently deemed the primary contributor to air accidents globally. Systems capable of alerting pilots when impending control loss is predicted to occur have the potential to promote safer flight. ... -
Simulation of a laminar flow model to enable design for manufacturing of laminar flow aerostructures
(CAMX - The Composites and Advanced Materials Exp, 2019-09)Advances in manufacturing technology can produce smooth aircraft surfaces to achieve laminar flow at high Reynolds numbers which can reduce drag significantly. Potential benefits include increased range, improved fuel ... -
Single network adaptive critic aided dynamic inversion for optimal regulation and command tracking with online adaptation for enhanced robustness
(John Wiley & Sons, Inc., 2014-07)To combine the advantages of both stability and optimality-based designs, a single network adaptive critic (SNAC) aided nonlinear dynamic inversion approach is presented in this paper. Here, the gains of a dynamic inversion ... -
Single Network Adaptive Critic aided nonlinear dynamic inversion for suboptimal command tracking
(IEEE, 2011-09-28)Using the Approximate Dynamic Programming (ADP) approach, nonlinear optimal control problems can be solved by using a dual neural network architecture called the Adaptive Critic (AC). A Single Network Adaptive Critic (SNAC) ... -
Solution of Maxwell’s equations for nonrectangular electromagnetic applications
(American Institute of Aeronautics and Astronautics, 2021-01)The use of a fourth-order modified Runge–Kutta (MRK) scheme on a transformed coordinate system with Maxwell’s equations for nonrectangular domains and applications is presented. Maxwell’s equations are the governing equations ... -
Solution of Maxwell’s equations using fourth-order modified Runge-Kutta scheme on transformed coordinates
(American Institute of Aeronautics and Astronautics Inc, 2020-01-05)The development and application of a fourth-order Modified Runge-Kutta (MRK) scheme on a transformed coordinate system with Maxwell’s equations are presented here. Maxwell’s equations are the governing equations for modeling ... -
Sound absorption and transmission loss properties of open-celled aluminum foams with stepwise relative density gradients
(Elsevier Ltd, 2022-05-01)We investigate the acoustical properties of uncompressed and compressed open-celled aluminum metal foams fabricated using a directional solidification foaming process. We compressed the fabricated foams using a hydraulic ... -
Spacecraft maneuver detection using optimal control theory and equations of relative motion
(Univelt Inc., 2018)In this paper, we investigate the spacecraft maneuver detection problem by considering an optimal control formulation, in which we minimize the control effort subject to the Hill-Clohessy-Wiltshire equations of relative ...