3 edition of Direct drive options for electric propulsion systems found in the catalog.
Direct drive options for electric propulsion systems
1995 by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English
|Statement||John A. Hamley.|
|Series||NASA technical memorandum -- 106576.|
|Contributions||United States. National Aeronautics and Space Administration.|
|The Physical Object|
Conclusion With all the advantages an integrated electric power system has to offer the submarine force, it is critical that we take this next step in advancing the design of our submarine propulsion plants. More and more, variable speed drives are used to save energy for example, in air-conditioning units, compressors, blowers, pumps and home appliances. Its diesel-electric plant is rated at 35 megawatts. First of all we want to reduce the drag. Regenerating when under sail.
Hence, precise motion control can be achieved. The result was greater efficiency in the cargo operations. However, the electric motor and power conversion technology of the s and s was not sophisticated enough to compete with the advances made in mechanical drive. Depending on electrical demand, not all diesel generators have to be operating at all times. To ensure the Fleet gets the greatest return on the investment in integrated electric power systems, the Navy plans to take a "corporate" approach to development where appropriate. John M.
This is a very fundamental step In January of this year, the Secretary of the Navy announced that the Zumwalt-class DD Land Attack Destroyer would be equipped with an integrated electric power system. Reduced Logistics Dependency: Modern Space Age and Information Age tools available in the commercial sector, together with proliferating precision-guided munitions and missiles in the hands of adversaries, will put non-stealthy and non-mobile logistics assets at risk. The beauty of diesel-electric propulsion is the diesel engines are turned on only as they are needed, and if an engine is lost, the remaining diesel-engine generators on the system can still provide power to both shaft lines. In board motor with the ability to eliminate hydrodynamic drag that the electric sail-drive, pod-drive and shaft-drive propulsion systems cannot.
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Existing transom exhaust opening is used to connect the inboard electrical motor with the carbon propeller shaft. An electric rocket engine cannot provide enough thrust to lift the vehicle from a planet's surface, but a low thrust applied for a long interval can allow a spacecraft to maneuver near a planet.
Offering in-depth coverage of hybrid propulsion topics, energy storage systems and modelling, and supporting electrical systems, this book will be an invaluable resource for practicing engineers and managers involved in all aspects of hybrid vehicle development, modelling, simulation and testing.
One basic diesel-electric operational challenge is closely matching actual electrical generation to varying electrical demands of ship systems while running any operating diesel engine at their level of peak performance. This capability would increase the submarine's range within the battlespace while reducing potential detection by minimizing ship maneuvering.
More and more, variable speed drives are used to save energy for example, in air-conditioning units, compressors, blowers, pumps and home appliances.
For propulsion, electrical power from the bus is sent to a motor drive often referred to as a motor controllerwhere the voltage and frequency of the electrical energy are modified to operate the propulsion motor at a desired speed.
It will also be of interest to postgraduate students in the field. TOTE had decided to build two new ships to replace its fleet of three aging steam-propulsion ships used on the Tacoma, Wash. For example, with larger quantities of electrical power available, hydrogen and oxygen can be made from seawater to act as fuel for a fuel cell.
To do this, another step change in the degree of modularity will be necessary to accommodate more and as yet unidentified payload and sensors and to achieve a wholly reconfigurable multi-mission fleet, a fleet that must meet emerging and growing demands to make more efficient use of naval platforms.
Wind turbines use electrical drives to convert wind energy into electrical energy. Environmental standards continue to become stricter. Today, electrical drives are used as propulsion systems in high-speed trains, elevators, escalators, electric ships, electric forklift trucks and electric vehicles.
Hence, precise motion control can be achieved. The propulsion motor then converts the electrical energy delivered by the motor controller into mechanical energy to rotate the propeller shaft. A much wider application is now enjoyed thanks to the developments in AC drive technology, the central power station concept for propulsion and ship services, and increasing interest in low emissions and propulsion plant redundancy.
Diesel-electric drive takes less space than the equivalent direct-drive two-stroke engine allowing the aft section to be slimmer and giving better flow over the propeller.
Flexible design fits all boats between 7 and 13 meters. To ensure the Fleet gets the greatest return on the investment in integrated electric power systems, the Navy plans to take a "corporate" approach to development where appropriate.
Synchroconverters facilitate starting and speed control of the two propulsion motors. During the TOTE ships' design phase, the naval architects determined that the use of diesel-electric with medium-speed low-height engines would permit reductions of the engine room height. About the Author: Dr.
However, the high velocity and lower reaction mass expended for the same thrust allows electric rockets to run for a long time. Photonic[ edit ] Photonic drive does not expel matter for reaction thrust, only photons.
Additionally, the political realities of reduced forward basing and reduced military support infrastructure greatly complicate the business of logistics. The GPA 's diesel-electric propulsion system consists of two azimuthing and one fixed Steerprop SP 10 L-Drives using General Electric traction motors and two kw fixed-pitch bow thrusters for maneuvering.Ultra high torque density motors for marine propulsion systems.
Magnomatics' pseudo-direct drive technology offers outstanding reductions in machine size and weight compared with permanent-magnet and wound-field electrical machines at the megawatt level where a combination of low speed and high-torque is required.
Jan 01, · The fourth section includes papers on flight testing of electric propulsion models, on vertical rocket probes, and on satellites, This section also discusses some advanced concepts in electric propulsion, such as air scooping during ascent through the atmosphere, systems design and optimization, and planetary and interplanetary atlasbowling.com Edition: 1.
This paper reviews the current state of marine electric propulsion systems and the various system developments currently being pursued to achieve greater power density and explains why these.
May 17, · Aerospace Propulsion Systems is a unique book focusing on each type of propulsion system commonly used in aerospace vehicles today: rockets, piston aero engines, gas turbine engines, ramjets, and scramjets.
Dr. Thomas A. Ward introduces each system in detail, imparting an understanding of basic engineering principles, describing key functionality mechanisms used in past /5(3).
Find your z-drive thruster easily amongst the 32 products from the leading brands (Berg Propulsion, VETH PROPULSION, ZF Marine, ) on NauticExpo, the boating and maritime industry specialist for your professional purchases/5(45). The LNG carriers are undergoing a period of rapid and profound change, with much larger size ships and novel propulsion systems emerging for fulfilling the market trends of LNG shipping industry.
There are various proposed propulsion solutions for LNG carriers, ranging from the conventional steam turbine and dual fuel diesel electric propulsion, until more innovative ideas such as slow speed Cited by: 2.