• Adaptive control of coupled dynamical systems: a mixed state and output feedback framework 

  Yucelen, Tansel; Gruenwald, Benjamin C.; Merve Dogan, Kadriye; Chakravarthy, Animesh; Menon, Alok N. (Taylor and Francis Ltd, 2019-10-15)

  This paper studies a class of coupled dynamical systems consisting of an actuated dynamical system interconnected with an unactuated dynamical system. The actuated dynamical system is considered to have a measurable state ...

• Objective function weight selection for sequential low-thrust orbit-raising optimization problem 

  Dutta, Atri; Arora, Lakshay (Univelt Inc., 2019-01)

  In this paper, we consider the low-thrust orbit-raising problem formulated as a sequence of optimal control sub-problems. This formulation is helpful in rapid and robust generation of geocentric electric orbit-raising ...

• Flight loads spectra of a fleet of heavy air tankers 

  Rokhsaz, Kamran; Kliment, Linda K.; Terning, Brett R.; Nelson, John A. (American Institute of Aeronautics and Astronautics Inc., 2019-06-10)

  In-flight recorded data from eight BAe-146s and eight RJ-85s flown in support of the United States Forest Service aerial firefighting operations have been analyzed. Flights have been divided into firefighting, ferry, and ...

• Laser ablation based on-orbit debris removal 

  Karampudi, Prathyusha (Wichita State University, 2019-07)

  Space debris are defunct man-made satellites orbiting in the low-earth orbit (LEO) and Geo-synchronous orbit (GEO) orbiting around earth with high velocities posing a serious threat for current and future missions. ...

• Elastic wave propagation in self-similar and non-self-similar hierarchical lattice structures 

  Ignacy Muthu, Refugine Nirmal (Wichita State University, 2019-07)

  Plane wave propagation in infinite two dimensional self-similar and non-self-similar square periodic lattices have been investigated using Floquet-Bloch Theory. Finite element analysis was applied to calculate dispersion ...

• Numerical estimation of slipstream characterisitics for propellers operating at low Reynolds numbers 

  Pampala, Ramya B. (Wichita State University, 2019-07)

  An accurate estimation of propeller slipstream characteristics is essential to evaluate the performance characteristics of airframe components placed within the propeller slipstream. The complicated vortical structures of ...

• Spacecraft maneuver detection using optimal control theory and equations of relative motion 

  Dutta, Atri; Raquepas, Joseph B. (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 ...

• Relative equations of motion using a new set of orbital elements 

  Chadalavada, Pardhasai; Dutta, Atri (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 ...

• Control of a flexible wing with flaps using a set theoretic active-passive framework 

  Menon, Alok N.; Chakravarthy, Animesh; Gruenwald, Benjamin C.; Yucelen, Tansel (American Institute of Aeronautics and Astronautics Inc., 2019-01-06)

  This paper develops a distributed parameter model for a multiple component structure morphing, flexible wing aircraft with a n trailing edge rigid flaps. Using a set-theoretic adaptive control approach that utilizes ...

• Simulated flight testing of an adaptive loss-of-control avoidance pilot advisory display 

  Rafi, Melvin; Rajaram, Kiran; Moustafa, Mohamed A.; Bin Salmaan Hussain, Danial Imran; Morales, Kevin; Steck, James E.; He, Jibo; Chakravarthy, Animesh (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. ...

• Retrofit winglets for wind turbines 

  Matheswaran, Vijay; Miller, Leonard Scott; Moriarty, Patrick J. (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 ...

• Machine learning applied to programming quantum computers 

  Steck, James E.; Behrman, Elizabeth C.; Thompson, Nathan (American Institute of Aeronautics and Astronautics, 2019-01-06)

  We apply machine learning to “program” quantum computers, both in simulation and in experimental hardware. A major difficulty in quantum computing is developing effective algorithms that can be programmed on a quantum ...

• Real-time adaptive prediction of loss-of-control margins on a fourth order aircraft 

  Rafi, Melvin; Steck, James E.; Chakravarthy, Animesh (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 ...

• Design, implementation and experimental testing of an inertial sensor system to quantify wing deflection 

  Schirmer, Georg; Steck, James E.; Chakravarthy, Animesh (American Institute of Aeronautics and Astronautics Inc., 2019-01-06)

  This research investigates a novel approach of using inertial micro-electromechanical sensors in combination with a Kalman state estimator to quantify wing deflection of a highly flexible morphing wing. Motivated by NASA’s ...

• Adaptive control system for flapping wing aircraft: A gain study on optimal control modification 

  Chandrasekaran, Balaji K.; Steck, James E. (American Institute of Aeronautics and Astronautics, Inc., 2019-01-06)

  Prior work developed a model for a bird-like flapping wing aircraft using Modified strip theory for aerodynamics, a flight dynamics model based on Newtonian equations and an adaptive flight controller. This model was ...

• Trajectory prediction using coupled cfd-rbd with dynamic meshing 

  Sathyanarayana, Nidhi D.; Hoffmann, Klaus A. (American Institute of Aeronautics and Astronautics, Inc., 2019-01-06)

  Debris released post bird impact can cause secondary damage to downwind airplane surfaces. The debris is simplified in geometry and represented as a flat plate. A coupled CFD-RBD solver with dynamic meshing is used for ...

• Experimental validation of honeycomb core forming limits 

  Kahle, Kaitlyn (Wichita State University, 2019-05)

  The objective of this thesis is to understand the deformation and potential node bond failures of fiberglass/phenolic honeycomb core during forming. This data will be used to provide experimental validation of a hyper ...

• Semi-tailless aircraft concept with variable cant stabilizers applied to small UAVS 

  Hagen, Kevin (Wichita State University, 2019-05)

  In recent years the use of small UAVs (<5lbs) has grown rapidly. While fundamentally the same as large aircraft, differences in requirements, payloads, and cost allow for a greater number of viable concepts. Many new ...

• Design, implementation and experimental testing of an inertial sensor system to quantify wing deflection 

  Schirmer, Georg (Wichita State University, 2019-05)

  This research investigates a novel approach of using inertial micro-electromechanical sensors in combination with a Kalman state estimator to quantify wing deflection of a highly flexible morphing wing. Motivated by ...

• Effect of data filtering on flight loads spectra 

  Rokhsaz, Kamran; Kliment, Linda K. (American Institute of Aeronautics and Astronautics, 2019-06-14)

  Operational data from 27.4 hours of aerial firefighting and ferry missions are used to examine the effect of various filters at removing the structural modes from the data and the corresponding effect on flight loads ...

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