Recent Submissions

  • Performance metrics for tiltrotor flight dynamics during the transition regime 

    Sunkara, Vishwamithra Reddy; Nobleheart, Wilfred; Chakravarthy, Animesh (American Institute of Aeronautics and Astronautics, 2014-11)
    For control system design purposes, desirable locations of short period and phugoid poles with their respective damping factors and natural frequencies are specified for fixed-wing aircraft in U.S. Department of Defense ...
  • Editorial: Message from SAMPE's global president 

    Vizzini, Anthony (SAMPE Publishers, 2014-11)
    I have been a member of SAMPE for 27 years. During that time, my professional network and my participation in the society has grown. I began by going to local chapter meetings, then I went to conferences in the United ...
  • Quaternion-Based Coordinates for Nonsingular modeling of high-inclination orbital transfer 

    Libraro, Paola; Kasdin, N. Jeremy; Choueiri, Edgar Y.; Dutta, Atri (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 ...
  • Editorial: Message from SAMPE's global president 

    Vizzini, Anthony (SAMPE Publishers, 2014-09)
    SAMPE was born among nine individuals working in the aerospace industry in Southern California, a likely place in 1944 for rising concerns on the lack of focus on materials and processing within their industry. It was ...
  • Single network adaptive critic aided dynamic inversion for optimal regulation and command tracking with online adaptation for enhanced robustness 

    Lakshmikanth, Geethalakshmi S.; Padhi, Radhakant; Watkins, John Michael; Steck, James E. (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 ...
  • Operational assessment of heavy air tankers 

    Rokhsaz, Kamran; Kliment, Linda K.; Nelson, John; Newcomb, James (American Institute of Aeronautics and Astronautics, 2014-01)
    Flight data collected by various P2V and P3A air tankers in actual operation over several seasons have been used to construct statistical information on aircraft usage and maneuver load spectra in this role. The data used ...
  • Editorial: Message from SAMPE's global president 

    Vizzini, Anthony (SAMPE Publishers, 2014-07)
    A message from SAMPE'S global president: The last time I wrote this note, I was ending my tenure as the International President of SAMPE. I am now writing as the Global President of SAMPE. So much has occurred in the world ...
  • A quantum neural network computes its own relative phase 

    Behrman, Elizabeth C.; Steck, James E. (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 ...
  • Modified state observer based adaptation of a general aviation aircraft - simulation and flight test 

    Pappu, Venkatasubramani S. R.; Steck, James E.; Rajagopal, Karthikeyan; Balakrishnan, S. N. (American Institute for Aeronautics and Astronautics, 2014-01)
    This paper presents some issues encountered while flight testing a Model Reference Adaptive dynamic inverse controller (MRAC), on a General Aviation (GA) fly-by-wire test bed. Adaptation was replaced with a Modified ...
  • Constrained and unconstrained propeller blade optimization 

    Dorfling, Johann; Rokhsaz, Kamran (American Institute for Aeronautics and Astronautics, Inc., 2014-01-17)
    Propeller optimization by means of calculus of variations is addressed in this paper. A procedure for deriving the Euler-Lagrange equations for both unconstrained and constrained propeller blade twist optimization is ...
  • Flight loads spectra of two business jets 

    Rokhsaz, Kamran; Kliment, Linda K.; Weinstein, Edward M. (American Institute for Aeronautics and Astronautics, Inc., 2014-01-17)
    Operational flight loads have been analyzed from two business jets, a Global 5000 and a Global Express XRS. It is shown that due to the differing nature of their missions, both airframes were subjected to nearly the same ...
  • Optimal and decentralized controller designs for an elastically shaped aircraft 

    Nobleheart, Wilfred G.; Chakravarthy, Animesh; Nguyen, Nhan (American Institute for Aeronautics and Astronautics, Inc., 2014-01-17)
    In this paper, control design of an elastically shaped aircraft with highly flexible wings is discussed. The aircraft has the capability to actively change the wing twist and bending in flight so as to achieve a local angle ...
  • Flight loads monitoring of USFS aerial supervision modules 

    Kliment, Linda K.; Rokhsaz, Kamran; Menon, Alok; Nelson, John; Terning, Brett; Weinstein, Edward M. (American Institute for Aeronautics and Astronautics, Inc., 2014-01-17)
    The USFS has collected flight data on Beechcraft King Airs which are being used as Aerial Supervision Modules. Data from seven aircraft is presented. The missions are separated into four flight phases: climb, cruise, ...
  • Crack propagation analysis using acoustic emission sensors for structural health monitoring systems 

    Kral, Zachary Tyler; Horn, Walter J.; Steck, James E. (Hindawi Publishing Corporation, 2013)
    Aerospace systems are expected to remain in service well beyond their designed life. Consequently, maintenance is an important issue. A novel method of implementing artificial neural networks and acoustic emission sensors ...
  • Detached eddy investigation of cavity resonance phenomenon in slender cavities 

    Syed, Shoeb Ahmed; Hoffmann, Klaus A. (AMER INST AERONAUTICS ASTRONAUTICS, 2013-05)
    Aerodynamic noise generation due to the presence of surface discontinuity has been a topic of research for more than five decades. Most investigations carried out are on cavities ranging from small gaps to large cavities ...
  • Minimizing errors from linear and nonlinear weights of WENO scheme for broadband applications with shock waves 

    Arshed, Ghulam Murshed; Hoffmann, Klaus A. (Elsevier, 2013-03-29)
    Improvements in the numerical algorithm for the dynamics of flows that involve discontinuities and broadband fluctuations simultaneously are proposed. These two flow features suggest numerical strategies of a paradoxical ...
  • Multiqubit entanglement of a general input state 

    Behrman, Elizabeth C.; Steck, James E. (Rinton Press, Inc., 2013-01)
    Measurement of entanglement remains an important problem for quantum information. We present the design and simulation of an experimental method for an entanglement indicator for a general multiqubit state. The system can ...
  • Numerical simulation of wall-pressure fluctuations due to a turbulent boundary layer 

    Mahmoudnejad, Niloufar; Hoffmann, Klaus A. (AMER INST AERONAUT ASTRONAUT, 2012)
    In this investigation, wall-pressure fluctuations due to a turbulent boundary layer are estimated by various numerical methods. Four different turbulence models, including one- and two-equation models and a recently developed ...
  • Numerical Analysis of Effects of Leading-Edge Protuberances on Aircraft Wing Performance 

    Malipeddi, Anil Kumar; Mahmoudnejad, Niloufar; Hoffmann, Klaus A. (American Institute of Aeronautics and Astronautics, 2012-09)
    The effects of biologically inspired leading-edge protuberances on aircraft wings were investigated by using a numerical scheme. Simulations were performed at a Reynolds number of 5.7 x 10(5) on wings with leading-edge ...
  • Study of mobile mixed sensing networks in an automotive context 

    Chakravarthy, Animesh; Song, Kyungyeol; Peraire, Jaime; Feron, Eric (Springer, 2012)
    Mixed sensing mobile networks comprise of mobile sensors that have different sensing capabilities. We look at such sensor networks in an automotive context; wherein automobiles with two levels of sensing (and consequently ...

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