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

    Hagen, Kevin (Wichita State University, 2019-04-26)
    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 ...
  • Higher-order estimations of load factor from derived gust velocity 

    Rokhsaz, Kamran; Kliment, Linda K. (American Institute of Aeronautics and Astronautics, Inc., 2018-11-12)
    Pratt's formula, in which the aircraft is modeled as a single-degree-of-freedom system, is used extensively to extract derived gust velocities from measured normal acceleration. There is evidence that airframe mass ...
  • Strength analysis of butt and strap joints under tension and bending 

    Griffin, Steven A.; Pang, Su-Seng; Yang, Chihdar Charles (Society for the Advancement of Material and Process Engineering, 1990-04)
    The strength analysis of a butt and strap composite pipe joint is provided. This commercial joint consists of mating two sections of pipe and overwrapping them with additional composite laminae. The pipe analyzed in this ...

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