Organizational Unit:
Mechanical Engineering (ME)

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The mission of the Mechanical and Aerospace Engineering department is to provide defense-relevant, advanced education and research programs to meet Naval unique needs, and increase the warfighting effectiveness of the U.S. Naval Forces, DoD and allied armed forces.
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Publication Search Results

Now showing 1 - 10 of 56
  • Publication
    A combined (USN/USCG) patrol corvette (CPCX)
    (Monterey, California. Naval Postgraduate School, 1996-05) Calvano, Charles Natale.; Witt, M. A.; Anderson, Eric.; Comar, John Francis.; Hurley, Jim.; Mechanical Engineering (ME); Research and Sponsored Programs Office (RSPO); Mechanical Engineering
  • Publication
    Data reduction, analysis and results of LACV-30-07 Air Cushion Vehicle tests, Fort Story, VA, August-September 1993
    (Monterey, California. Naval Postgraduate School, 1994-02) Shin Y. S.; Hoy, Eric Harlyn; Mechanical Engineering (ME); Mechanical Engineering
    The LACV-30-07 Air Cushion Vehicle was instrumented and tested at Fort Story, VA during the months of August-September 1993 by Ed. Thomas, NSWC- Cardrock Division, Annapolis Detachment, Annapolis, MD. The tests include 27 cuts with vehicle speed ranging from 0 to 42 knots and approximate wave height of 0 to 2.5 feet. Two triaxial accelerometers, and a pitch and roll transducer were installed to measure axial, transverse and vertical accelerations and pitch and roll (in degree) of the vehicle. The test results clearly show that the vibration g-amplitude is extremely low (fraction of 1-g level) for air cushion vehicle and air cushion vehicle itself is acting as a super-damper to reduce the wave-induced vibration response amplitude. The vibration amplitude in terms of g-level may not be the controlling factor, but the combined vehicle dominant frequencies, vibration g-level, and duration may be the definite factors that the superconductor magnet must persist. Air cushion vehicle, Vibration criteria, Wave height, Vibration g-level pitch and roll
  • Publication
    Prototype line of sight and target acquisition software for high resolution databases
    (Monterey, California. Naval Postgraduate School, 1995-12) Driels, Morris R.; Lind, Judith H.; Mechanical Engineering (ME); Mechanical Engineering
  • Publication
    Nonlinear Response of Cylindrical Shells to Underwater Explosion: Testings and Numerical Prediction Using USA/DYNA3D / June 1, 1991 - March 1, 1992
    (Monterey, California: Naval Postgraduate School., 1992-03) Fox, P. K.; Kwon, Y. W.; Shin, Y. S.; Mechanical Engineering (ME); Mechanical Engineering
    Nonlinear 3-D Dynamic Analysis Code (VEC/DYNA3D) has been interfaced with Underwater Shock Analysis Code (USA) and capabilities were developed to perform numerical analysis of submerged and semi-submerged marine structures subjected to underwater explosion. A series of numerical analysis were performed to determine the elastic and elasto-plastic responses of cylindrica shell type structures. The results were favorably compared with those of underwater explosion testings. The coupled code USA/DYNA3D makes possible to predict shock-induced damage response of naval structure. In addition, numerical sensitivity analyses were undertaken to determine the importance of various physical and numerical modeling factors. This study showed clearly three types of response modes of cylinder subjected to a side-on explosion: accordion mode, breathing mode and whipping mode.
  • Publication
    A computer subroutine for stress analysis of rotating, heated disks
    (Monterey, California. Naval Postgraduate School, 1978-05) Brock, John E.; Brown, Robert E.; Mechanical Engineering (ME); Mechanical Engineering
    This report gives listing and instructions for using a digital computer subroutine for finding stress distribution in a thin rotating disk with nonuniform heating; the problem is axisymmetric. An iterative method is used. Theoretical background is given.
  • Publication
    A surface integral approach to the motion planning of nonholonomic systems
    (Monterey, California. Naval Postgraduate School, 1992-08) Mukherjee, Ranjan.; Mechanical Engineering (ME); Mechanical Engineering
    Nonholonomic mechanical systems are governed by constraints of motion that are nonintegrable differential expressions. Unlike holonomic constraints, these differential constraints do not reduce the number of dimensions of the configuration space of a system. Therefore, a nonholonomic system can access a configuration space of dimension higher than the number of degrees of freedom of the system. In this paper, we develop an algorithm for planning admissible trajectories for nonholonomic systems that will take the system from one point in its configuration space to another. In our algorithm we first converge the independent variables to their desired values and then use closed trajectories of the independent variables to converge the dependent variables. We use Stokes's theorem in our algorithm to convert the problem of finding a closed path into that of finding a surface area in the space of the independent variables, such that the dependent variables converge to their desired values as the independent variables traverse along the boundary of this surface area. The use of Stokes's theorem simplifies the motion planning problem and also imparts global characteristics. The salient features of our algorithm are apparent in the two examples that we discuss - a planar space robot and a disk rolling without slipping on a flat surface
  • Publication
    A critical review of the intrinsic nature of vortex induced vibrations
    (Monterey, California. Naval Postgraduate School, 2003-06-16) Sarpkaya, Turgut; Mechanical Engineering (ME); Research and Sponsored Programs Office (RSPO); Mechanical Engineering
    This is a concise and comprehensive review of the progress made during the past two decades on vortex induced vibration (VIV) of mostly circular cylindrical structures subjected to steady uniform flow. The critical elements of the evolution of the ideas, theoretical insights, experimental methods, and numerical models are traced systematically; the strengths and weaknesses of the current state of the understanding of the complex fluid/structure interaction are discussed in some detail. Finally, some suggestions are made for further research on VIV. The organization of the paper is given at the end of the next section.
  • Publication
    Design and evaluation of a Differential Global Positioning System (DGPS) for the NPS Autonomous Underwater Vehicle (AUV)
    (Monterey, California. Naval Postgraduate School, 1999-08) Piton, Gwladys; Mechanical Engineering (ME); Research and Sponsored Programs Office (RSPO); Mechanical Engineering
    Accurate underwater positioning remains an important challenge to AUV researchers. Recent development of Differential Global Positioning System (DGPS) embedded in an AUV proved the capability of DGPS fixes to reduce the position error. By surfacing regularly, the AUV takes DGPS fixes and integrates them for position estimation. The purpose of this study is to develop a low-cost DGPS for the NPS AUV. To match mission requirements, the system is designed such that the differential receiver and the GPS receiver are two independent stations using radio modems to communicate. Local experimental testing showed that this system can yield positions within one to five meters accuracy.
  • Publication
    Submarine-installed machinery monitoring and diagnostics: A state-of-the-art review
    (Monterey, California. Naval Postgraduate School, 1990) Robinson, John D.; Rossano, Graham W.; Shin, Y. S.; Mechanical Engineering (ME); Research and Sponsored Programs Office (RSPO); Mechanical Engineering
    This state-of-the-art review identifies and discusses existing methods and techniques of machinery monitoring and diagnostics applicable to submarine-installed machineries, their limitations, and base-technology needs. Also included are discussions of machinery monitoring and its concept, condition monitoring and diagnostics techniques, machinery maintenance programs, vibration monitoring techniques and the current practice in U.S. Navy machinery vibration monitoring programs. The main objective is to provide the basis for research and development of future needs in this area.
  • Publication
    The maritime preposition force ship 2010
    (Naval Postgraduate School, 1999-04-19) Calvano, Charles N; Harney, Robert C.; Anderson, Thomas; Arrington, Jess; Kan, Joseph; McKerrow, Gary; Vaidyanathan, Rajan; Weekly, Randolph R.; Mechanical Engineering (ME); Mechanical Engineering
    A systems engineering approach to the design of a ship that will satisfy the requirements for a Maritime Prepositioning Force (MPF) for the year 2010 and beyond is presented. This ship, the MPF 2010, will provide the means by which the United States Marine Corps will be able to successfully employ the tenets of Operational Maneuver From the Sea (OMFTS) and the Ship-to-Objective Maneuver (STOM) against an objective. The current Marine Prepositioning Ship (MPS) suqadrons are used to preposition supplies, vehicles, and equipment throughout the world for use by a Marine Air-Ground Task Force (MAGTF) of Marine Expeditionary Force - Forward, MEF (FWD) size, in times of crisis. However, these squadrons presently require that a secure airfield and port (or beachhead) be available so that the prepositioned MPS assets can be offloaded and married with arriving MAGTF personnel ashore. As such, the current MPS squadrons do not support the concepts of OMFTS and STOM. The MPF 2010 will provide the capability to embark a MEF (FWD), marry the MEF (FWD) with its prepositioned equipment while en route to the objective, and then act as sea base from which it will be able to employ air, ground and amphibious assets to project power ashore.