Modeling for ship power system emulation

Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.Includes bibliographical references (p. 68).With the U.S. Navy's continued focus on Integrated Fight Thru Power (IFTP) there has been an ever increasing effort to ensure an electrical distribution system that maintains maximum capabilities in the event of system faults. This is to ensure that the crew has the ability to complete real time tactical missions in the event of battle damage to any localized portions of the electrical distribution system. Fault isolation is a priority component of the U.S. Navy's Next Generation Integrated Power System (NGIPS) Roadmap, which lays out the framework as well as milestone dates for future development. Non-Intrusive Load Monitoring (NILM), which has been used extensively for condition based maintenance applications, could simultaneously be used to enhance the existing zonal protection system employed with Multi-Function Monitors (MFM). NILM may be able to, inexpensively, use the existing current and voltage sensors available from the MFM hardware to determine electrical loading which could allow for faster fault isolation capability. A test platform with three 5000 watt synchronous generators is being constructed to emulate a U.S. Navy DDG 51 FLT IIA class ship electric plant. This is being accomplished in order to evaluate the feasibility of improving the fault isolation capabilities of the MFM with NILM implementation. The first step in this endeavor will be to electrically relate the test platform to the DDG electric plant. In order to accomplish this step, the fault simulation results from the test platform will be compared to simulated faults using U.S. Navy data from DDG 51 electric plants.(cont.) This will allow for the fault isolation results from the test platform to be related to the DDG 51 electric plant.by Jeremy T. Leghorn.S.M.Nav.E

Field Demonstration of a Real-time Non-intrusive Monitoring System for Condition-based Maintenance

The performance of important electrical loads on mission critical systems like warships or off-shore platforms is often tracked by dedicated monitoring equipment. Individual monitoring of each load is expensive and risky. Expense occurs because of the need for individual sensors and sensor wiring for every load of interest. Reliability is compromised because detected failures or fault conditions might legitimately be due to load failure, but might also be due to errors or failure in the sensor network or recording instruments. The power distribution network on a warship could be pressed into “dual-use” service, providing not only power distribution but also a diagnostic monitoring capability based on observations of the way in which loads draw power from the distribution service. This paper describes field tests of a prototype system that monitors multiple loads using existing electrical wiring. Initial results are presented from a device that monitors a small collection of motors and two other devices that monitor an entire engine room.Grainger Foundation; National Science Foundation (U.S.); United States. National Aeronautics and Space Administration; United States. Coast Guard; United States. Office of Naval Research. Electric Ship Research and Development Consortium; NAVSEA; University of North Carolin

Interfirm Mobility As A Stochastic Process: Organizational Attachment In Work Careers Of Men In Detroit And Yokohama.

PhDLabor relationsUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/189869/2/7718059.pd

Cloak Island: A Novella

Cloak Island is a novella in progress. Those familiar with the Champlain Valley in Vermont may know that Cloak Island is a real place, a tiny island in Lake Champlain. The events and characters in this story, however, are fictionalized. This story does not belong to any single character alone; instead, it is an examination of how a family comprehends loss. Each character has her own way of finding meaning in absence, and the conclusion of the story reveals that, at least in the world of this particular story, the lost and the living are more linked than previously imagined. While this story was not always haunted by ghosts, one appeared naturally along the way, around the fourth of fifth revision. Strangely, it felt as if he had been part of the story all along. Joseph A. Citro’s book Green Mountains, Dark Tales (UPNE, 2001) was very useful for my research regarding the origins of Cloak Island’s name. In Chapter 7, I reference the final line from a beautiful poem by Kazim Ali titled “Departure.” The final line reads: “Carry what you can in your hands. Scatter the rest.

Modeling for ship power system emulation

CIVINS (Civilian Institutions) Thesis documentWith the U.S. Navy's continued focus on Integrated Fight Thru Power (IFTP) there has been an ever increasing effort to ensure an electrical distribution system that maintains maximum capabilities in the event of system faults. Non-Intrusive Load Monitoring (NILM), which has been used extensively for condition based maintenance applications, could simultaneously be used to enhance the existing zonal protection system employed with Multi-Function Monitors (MFM). A test platform with three 5000 watt synchronous generators is being constructed to emulate a U.S. Navy DDG 51 FLT IIA class ship electric plant. This is being accomplished in order to evaluate the feasibility of improving the fault isolation capabilities of the MFM with NILM implementation. The first step in this endeavor will be to electrically relate the test platform to the DDG electric plant. In order to accomplish this step, the fault simulation results from the test platform will be compared to simulated faults using U.S. Navy data from DDG 51 electric plants. This will allow for the fault isolation results from the test platform to be related to the DDG 51electric plant.http://archive.org/details/modelingforshipp109454302Contract number: N62271-97-G-0026.CIVINSApproved for public release; distribution is unlimited

The Best of Both Worlds?: Combining Work and Motherhood on a 24/7 Planet

Adopting feminist methodology, this research explores the work and motherhood choices of female paramedics with the aim of adding to knowledge in the area of ‘women and work’. Primarily, it aims to investigate the difference of opinion between Hakim (1996, 2000) and Crompton and Harris (1998) about the extent of the determinative effect of lifestyle choices. Paramedics have a well-evidenced high level of work attachment. This provides a unique, distinctive and original means of testing their respective views. The research finds that contrary to Hakim, work attachment or orientation to work is not a sole determinative of women’s workplace position to the extent that they ultimately have absolute free choice (Hakim 1996, 2000) as constraints exist which serve to limit this (Crompton and Harris 1998). Secondly, exploration of the respondents’ narratives necessarily provides insight into the role of their husbands/partners. Adding to knowledge in the area of modern parenting and its impact on women’s choices, the research finds that in contrast to the somewhat limited adoption of ‘new fatherhood’ and ‘shared parenting’ in households found in other research (Bittman 2004; Bianchi et al 2006; Fox 2009), my respondents tended to epitomise the ideal model of ‘50-50’ in the fullest sense. Lastly, undertaking this research in the ambulance service setting where 24/7-365 working is required of all paramedics has provided the unique means of exploring whether women’s work choices now extend beyond 9-5. The research found that shift work is not a barrier to women’s workplace position but in fact an enabler of it. The research concludes that despite assertions to the contrary, women do have more choice than previously if they want it enough and can overcome the constraints. The ‘best of both worlds’ is potentially more viable today, if that is what women want