Now showing items 1-20 of 31

  • Adhesive-bonded composite joint analysis with delaminated surface ply using strain-energy release rate 

    Chadegani, Alireza; Yang, Chihdar; Smeltzer, Stanley S., III (AMER INST AERONAUT ASTRONAUT, 2012-03)
    This paper presents an analytical model to determine the strain energy release rate due to an interlaminar crack of the surface ply in adhesively bonded composite joints subjected to axial tension. Single-lap shear-joint ...
  • Collision cones for quadric surfaces 

    Chakravarthy, Animesh; Ghose, Debasish (IEEE, 2011-12)
    The problem of collision prediction in dynamic environments appears in several diverse fields, which include robotics, air vehicles, underwater vehicles, and computer animation. In this paper, collision prediction of objects ...
  • 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 ...
  • 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 ...
  • Dynamics and performance of tailless micro aerial vehicle with flexible articulated wings 

    Paranjape, Aditya A.; Chung, Soon-Jo; Hilton, Harry H.; Chakravarthy, Animesh (The American Institute of Aeronautics and Astronautics, 2012-05-05)
    The purpose of this paper is to analyze and discuss the performance and stability of a tailless micro aerial vehicle with flexible articulated wings. The dihedral angles can be varied symmetrically on both wings to control ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Effect of dents on crack growth in aluminum alloy under constant-amplitude loading 

    Smith, Bert; Shivally, Praveen; Kumar, Brijesh (AMER INST AERONAUT ASTRONAUT, 2012-03)
    The purpose of this study was to determine the effect of dents on the stable crack growth in 0.04-in.-thick 2024-T3 bare aluminum sheet. The test specimens were either pristine, dented, or reworked. The edge-cracked ...
  • 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, ...
  • 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 ...
  • Generalization of the collision cone approach for motion safety in 3-D environments 

    Chakravarthy, Animesh; Ghose, Debasish (Springer, 2012-02)
    Avoidance of collision between moving objects in a 3-D environment is fundamental to the problem of planning safe trajectories in dynamic environments. This problem appears in several diverse fields including robotics, air ...
  • A hybrid scheme for the numerical simulation of shock/discontinuity problems 

    Mahmoudnejad, Niloufar; Hoffmann, Klaus A. (Taylor & Francis, 2011)
    To address accuracy issues for direct numerical simulation, a hybrid scheme based on the weighted compact scheme (WCS) and weighted essentially non-oscillatory (WENO) scheme is developed. The new hybrid method incorporates ...
  • 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 ...
  • 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 ...
  • 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 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 ...
  • 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 simulations of pulsatile flow in an end-to-side anastomosis model 

    Shaik, Eleyas; Hoffmann, Klaus A.; Dietiker, JF. (Tech Science Press, 2007-03)
    A potential interaction between the local hemodynamics and the artery wall response has been suggested for vascular graft failure by intimal hyperplasia (IH). Among the various hemodynamic factors, wall shear stress has ...