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Author : United States. General Accounting Office
Release : 1996
Genre : Gas-turbines
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Navy Ship Propulsion by : United States. General Accounting Office
Download or read book Navy Ship Propulsion written by United States. General Accounting Office. This book was released on 1996. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Release : 2000
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Electric-Drive Propulsion for U.S. Navy Ships by :
Download or read book Electric-Drive Propulsion for U.S. Navy Ships written by . This book was released on 2000. Available in PDF, EPUB and Kindle. Book excerpt: The Navy in January 2000 selected electric-drive propulsion technology for use on its planned next-generation DD-21 land-attack destroyer and is considering it for use on other kinds of Navy ships as well. Electric drive poses issues for Congress concerning its costs, benefits and risks, and how the technology should be integrated into the DD-21 program or other ship-acquisition programs. Several foreign countries are developing or using electric drive in commercial or naval ships. The U.S. Navy's electric-drive development effort centers on the Integrated Power System (IPS) program. Several private-sector firms in the United States are now pursuing electric drive for the U.S. Navy market. Electric drive offers significant anticipated benefits for U.S. Navy ships in terms of reducing ship life-cycle cost, increasing ship stealthiness, payload, survivability, and power available for non-propulsion uses, and taking advantage of a strong electrical power technological and industrial base. Potential disadvantages include higher nearterm costs, increased technical risk, increased system complexity, and less efficiency in full-power operations. The current scarcity of precise and systematic estimates of the costs and benefits of electric drive makes it difficult for policymakers to assess the relative cost-effectiveness of differing technical approaches to achieving electric drive. Some of the risks involved in developing electric-drive technology have been mitigated by the successful development of electric-drive technology for commercial ships; estimates of the amount of remaining risk vary. The Navy has stated that developing common electric-drive components is feasible for several kinds of Navy ships and that pursuing electric drive technology in the form of a common family of components could have advantages for the Navy. The potential savings associated with a common system are difficult to estimate, but could be substantial. The concept of developing a common system or family of components poses issues for policymakers concerning the extent of commonality across electric-drive-equipped Navy ships and the use of competition in the development and procurement of electric-drive technology. Much of the debate over electric drive concerns electric motors. The five basic types in question - synchronous motors, induction motors, permanent magnet motors, superconducting synchronous motors, and superconducting homopolar motors - differ in terms of their technological maturity, power-density, and potential applicability to different Navy ship types. The Navy's decision to use electric drive on the DD-21 raises several potential issues concerning the acquisition strategy for the ship. Electric drive could be installed on Virginia (SSN-774) class submarines procured in FY2010, according to the Navy. Other candidates for electric drive include the Navy's planned TADC(X) auxiliary dry cargo ships, the Navy's planned joint command and control (JCC[X]) ships, the second through fifth LHA replacement ships, future aircraft carriers, and possibly the new cutters to be procured under the Coast Guard Deepwater project.
Author : Tyler A. Pitrof
Release : 2024
Genre : History
Kind : eBook
Book Rating : 405/5 ( reviews)
Book Synopsis Too Far on a Whim by : Tyler A. Pitrof
Download or read book Too Far on a Whim written by Tyler A. Pitrof. This book was released on 2024. Available in PDF, EPUB and Kindle. Book excerpt: Argues that the US Navy's commitment to high-steam propulsion for its World War II fleet was a tactical, technological, and bureaucratic failure
Author :
Release : 2006
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Navy Ship Propulsion Technologies by :
Download or read book Navy Ship Propulsion Technologies written by . This book was released on 2006. Available in PDF, EPUB and Kindle. Book excerpt: General strategies for reducing the Navy's dependence on oil for its ships include reducing energy use on Navy ships; shifting to alternative hydrocarbon fuels; shifting to more reliance on nuclear propulsion; and using sail and solar power. Reducing energy use on Navy ships. A 2001 study concluded that fitting a Navy cruiser with more energy-efficient electrical equipment could reduce the ship's fuel use by 10% to 25%. The Navy has installed fuel-saving bulbous bows and stern flaps on many of its ships. Ship fuel use could be reduced by shifting to advanced turbine designs such as an intercooled recuperated (ICR) turbine. Shifting to integrated electric-drive propulsion can reduce a ship's fuel use by 10% to 25%; some Navy ships are to use integrated electric drive. Fuel cell technology, if successfully developed, could reduce Navy ship fuel use substantially. Alternative hydrocarbon fuels. Potential alternative hydrocarbon fuels for Navy ships include biodiesel and liquid hydrocarbon fuels made from coal using the Fischer-Tropsch (FT) process. A 2005 Naval Advisory Research (NRAC) study and a 2006 Air Force Scientific Advisory Board both discussed FT fuels. Nuclear propulsion. Oil-fueled ship types that might be shifted to nuclear propulsion include large-deck amphibious assault ships and large surface combatants (i.e., cruisers and destroyers). A 2005 "quick look" analysis by the Naval Nuclear Propulsion Program concluded that total life-cycle costs for nuclearpowered versions of these ships would equal those of oil-fueled versions when oil reaches about $70 and $178 per barrel, respectively. Sail and solar propulsion. Kite-assisted propulsion might be an option for reducing fuel use on Navy auxiliaries and DOD sealift ships. Two firms are now offering kite-assist systems to commercial ship operators. Solar power might offer some potential for augmenting other forms of shipboard power, perhaps particularly on Navy auxiliaries and DOD sealift ships. Legislative activity. Section 128 of the FY2007 defense authorization bill (H.R. 5122) states that "it is the sense of Congress that the Navy should make greater use of alternative technologies, including nuclear power, as a means of vessel propulsion for its future fleet of surface combatants." The Senate report (S.Rept. 109-292 of July 25, 2006) on the FY2007 defense appropriations bill (H.R. 5631) encourages DOD to continue exploring FT fuels and requires a report on synthetic fuels. Section 214 of the conference report (H.Rept. 109-413 of April 6, 2006) on the Coast Guard and Maritime Transportation Act of 2006 (H.R. 889) requires the Coast Guard to conduct a feasibility study on using biodiesel fuel in new and existing Coast Guard vehicles and vessels. Section 130 of the conference report (H.Rept. 109-360 of December 18, 2006) on the FY2006 defense authorization act (H.R. 1815, P.L. 109-163 of January 6, 2006) requires the Navy to submit a report by November 1, 2006, on alternative propulsion methods for surface combatants and amphibious warfare ships. This report will be updated as events warrant.
Author : Tanya D. Zapata
Release : 2019-08-25
Genre : History
Kind : eBook
Book Rating : 165/5 ( reviews)
Book Synopsis Naval Mechanical Engineering by : Tanya D. Zapata
Download or read book Naval Mechanical Engineering written by Tanya D. Zapata. This book was released on 2019-08-25. Available in PDF, EPUB and Kindle. Book excerpt: Naval Mechanical Engineering: Gas Turbine Propulsion, Auxiliary, and Engineering Support Systems is a technical publication for professional engineers to assist in understanding various ships auxiliary systems. You will learn how they are applied to the overall propulsion plant and how the pumps and valves are used in the systems. Since the auxiliary systems vary between ship types, you will learn the systems in general terms. The maintenance and upkeep of the auxiliary systems are extremely important since, without them, the main engines would not be able to operate. You will be presented with some of the various factors that affect gas turbine performance, procedures for engine changeout, and power train inspection. In conclusion, you will learn a few of the maintenance, operating problems, and repair of pneumatic systems, low-pressure air compressors (LPAC), hydraulic systems, pumps, valves, heat exchangers, and purifiers. Proper maintenance or repair work consists of problem diagnosis, disassembly, measurements, corrections of problems, and reassembly. Use of proper tools, knowledge of the construction of equipment, proper work site management, and cleanliness are keys to successful maintenance and repair work.
