Organization:
Mechanical Engineering (ME)

Description

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.

Website of the organization

https://nps.edu/web/mae

Full item page

Publication Search Results

Now showing 1 - 10 of 51

COPES - A FORTRAN Control Program for Engineering Synthesis
(Monterey, California. Naval Postgraduate School, 1982-03) Madsen, Leroy E.; Vanderplaats, Garret N.; Mechanical Engineering (ME); Mechanical Engineering (ME)
A FORTRAN COntrol Program for Engineering Synthesis (COPES) has been developed for solving engineering design problems. The program maximizes or minimizes a numerically defined objective function subject to a set of inequality constraint functions. COPES uses the optimization program, C0NMIN, which includes the conjugate direction method of Fletcher and Reeves for unconstrained function minimization and a modification of Zoutendijk's method of feasible directions for constrained function minimization. Additionally, approximation techniques are available for use in optimization, and trade-off studies may be performed. A simple design example demonstrates the program capabilities. Programming guidelines are presented followed by sample input data and output for each program option.
Rule Based Design Optimization of Cradle Structures Using Frequency Domain Structural Synthesis
(Monterey, California. Naval Postgraduate School, 1993-12-31) Gordis, Joshua H.; Healy, Anthony J.; Cook, Ronald E.; Mechanical Engineering (ME); Mechanical Engineering
This work investigates the use of frequency domain structural synthesis and an expert system rule based design methodology for automating the design of the submarine machinery cradle. The expert system provides 'intelligent' automated executive control of the design process. Frequency domain structural synthesis provides the means to rapidly alter the structural configuration of the cradle design and calculate dynamic response. The goal is the minimization of structural dynamic transmissibility.
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.
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
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.
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.
A Graphic User Interface (GUI) for generating NPS Autonomous Underwater Vehicle (AUV) execution script files
(Monterey, California. Naval Postgraduate School, 1999-08) Doleac, Joel.; Mechanical Engineering (ME); Mechanical Engineering
Ship shock trial modeling and simulation of USS Winston S. Churchill (DDG 81)
(Monterey, California. Naval Postgraduate School, 2003) Schneider, Nathan A.; Shin, Young S.; Mechanical Engineering (ME); Naval Sea Systems Command; Mechanical Engineering
During World War II many surface combatants were damaged or severely crippled by close-proximity underwater explosions from ordnance that had actually missed their target. Since this time all new classes of combatants have been required to conduct shock trial tests on the lead ship of the class in order to test the survivability of mission essential equipment in a severe shock environment. While these tests are extremely important in determining the vulnerabilities of a surface ship, they require an extensive amount of preparation, manhours, and money. Furthermore, these tests present an obvious danger to the crew on board, the ship itself, and any marine life in the vicinity. Creating a virtual shock environment by use of a computer to model the ship structure and the surrounding fluid presents a valuable design tool and an attractive alternative to these tests. The research summarized in this report investigated the accuracy of shock simulation using the shock trials conducted on USS WINSTON S. CHURCHILL (DDG 81) in 2001. All three explosions DDG 81 was subjected to are simulated and the resulting predictions compared with actual shock trial data. The effects of fluid volume size, mesh density, mesh quality, and shot location are investigated.
Stress analysis of thermowells
(Monterey, California : Naval Postgraduate School, 1974-11-11) Brock, John E.; Mechanical Engineering (ME); Mechanical Engineering
This monograph examineB the mechanical-structural integrity of thermowells to sustain pressurization and excitaticn:s due to fluid flow. Suggested design criteria, which ~re shown to be conservative, are more inclusive than currently employed criteria, and in one tmportant aspect, namely with respect to pressurization, are more liberal.
Wavelet transform for time-frequency analysis of vibrational signature and its application
(Monterey, California. Naval Postgraduate School, 1993-08-17) Shin, Y. S.; Jeon, Jae-Jin; Mechanical Engineering (ME); Mechanical Engineering
Wavelet transform is applied to the analysis of vibration signatures in order to verify the ability of the detection of abnormal condition. It can well describe the dynamics of the signal's spectral composition of a non- stationary and stationary signal to be measured and presented in the form of 3-D time-frequency map. Although wavelet has been developed over about ten years in the mathematics and physics, its engineering applications is a first stage. The objective of this report outlines the definition of the wavelet transform and is to discuss the properties of the wavelet transform as new tool for the vibration analysis, and then demonstrates how it may be applied to the machinery condition monitoring.