Effect Of Voltage Level On Power System Design For Solar Electric Propulsion Missions Nasa Tm 2003 212304 National Aeronautics And Space Administration April 2003

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Effect of Voltage Level on Power System Design for Solar Electric Propulsion Missions

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721572557
Total Pages : 34 pages
Book Rating : 4.5/5 (725 download)

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Book Synopsis Effect of Voltage Level on Power System Design for Solar Electric Propulsion Missions by : National Aeronautics and Space Administration (NASA)

Download or read book Effect of Voltage Level on Power System Design for Solar Electric Propulsion Missions written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents study results quantifying the benefits of higher voltage, electric power system designs for a typical solar electric propulsion spacecraft Earth orbiting mission. A conceptual power system architecture was defined and design points were generated for system voltages of 28-V, 50-V, 120-V, and 300-V using state-of-the-art or advanced technologies. A 300-V 'direct-drive' architecture was also analyzed to assess the benefits of directly powering the electric thruster from the photovoltaic array without up-conversion. Fortran and spreadsheet computational models were exercised to predict the performance and size power system components to meet spacecraft mission requirements. Pertinent space environments, such as electron and proton radiation, were calculated along the spiral trajectory. In addition, a simplified electron current collection model was developed to estimate photovoltaic array losses for the orbital plasma environment and that created by the thruster plume. The secondary benefits of power system mass savings for spacecraft propulsion and attitude control systems were also quantified. Results indicate that considerable spacecraft wet mass savings were achieved by the 300-V and 300-V direct-drive architectures. Kerslake, Thomas W. Glenn Research Center NASA/TM-2003-212304, E-13876, NAS 1.15:212304

Hearings, Reports and Prints of the Senate Select Committee on Small Business

Author : United States. Congress. Senate. Select Committee on Small Business
Publisher :
ISBN 13 :
Total Pages : 1776 pages
Book Rating : 4.:/5 (36 download)

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Book Synopsis Hearings, Reports and Prints of the Senate Select Committee on Small Business by : United States. Congress. Senate. Select Committee on Small Business

Download or read book Hearings, Reports and Prints of the Senate Select Committee on Small Business written by United States. Congress. Senate. Select Committee on Small Business and published by . This book was released on 1975 with total page 1776 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Feasibility Study - VA Hospital Building System

Author : United States. Veterans Administration
Publisher :
ISBN 13 :
Total Pages : 396 pages
Book Rating : 4.:/5 (3 download)

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Book Synopsis Feasibility Study - VA Hospital Building System by : United States. Veterans Administration

Download or read book Feasibility Study - VA Hospital Building System written by United States. Veterans Administration and published by . This book was released on 1972 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Area Handbook for Greece

Author : American University (Washington, D.C.). Foreign Areas Studies Division
Publisher :
ISBN 13 :
Total Pages : 380 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Area Handbook for Greece by : American University (Washington, D.C.). Foreign Areas Studies Division

Download or read book Area Handbook for Greece written by American University (Washington, D.C.). Foreign Areas Studies Division and published by . This book was released on 1970 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:

2028 End

Author : Gabriel Erb
Publisher :
ISBN 13 : 9781733210508
Total Pages : 120 pages
Book Rating : 4.2/5 (15 download)

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Book Synopsis 2028 End by : Gabriel Erb

Download or read book 2028 End written by Gabriel Erb and published by . This book was released on 2019-07-12 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: God created a game - it's called The Game of Life. Planet Earth is the playing field, the 10 love commandments are the rules, and we humans are the players who can win or lose. The game is played by two teams, like the game of football. One team's head coach is Jesus and the other team's head coach is Satan. All of us on earth are playing for one of these two teams! Gabriel Ansley Erb wrote the book "2028 END" in order to fully elucidate God's game clock scenario for The Game of Life as contained in the game's handbook, the Holy Bible. The handbook says, "God declared the end from the beginning" (Isaiah 46:10) by using 7 days in the creation event. Each 24 hour creation day foretold of a future 1,000 year period for a total 7,000 year plan God had for The Game of Life to be played on planet earth. And amazingly, to confirm this is all true, God hid a secret prophesy in each creation day foretelling the greatest event He had planned to occur in that day's future millennium!Consequently, Creation day 1 foretold Adam & Eve's fall, which was fulfilled during earth's 1st millennium. Creation day 2 foretold Noah's global flood, which was fulfilled during earth's 2nd millennium. Creation day 3 foretold Moses' Red Sea parting, which was fulfilled during earth's 3rd millennium. Creation day 4 foretold of John the Baptist & Jesus Christ, and so they lived and died during earth's 4th millennium. And the prophecies continue with each Creation day!Gabriel proves all of the above, carefully revealing the prophetic Scriptures as well as the fulfillment Scriptures. Then he reveals a dozen Scriptures proving Christ died earth's 4,000 year and will return earth's 6,000 year. Finally, he proves Christ died Feast of Passover AD 28 and will return Feast of Trumpets 2028. For those who read this book, it is an open and shut case: The Game of Life will end 2,000 years from the year of Christ's death on the cross - AD 2028.

Research for People in Need

Author : United States. Social and Rehabilitation Service. Division of Research Utilization
Publisher :
ISBN 13 :
Total Pages : 64 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Research for People in Need by : United States. Social and Rehabilitation Service. Division of Research Utilization

Download or read book Research for People in Need written by United States. Social and Rehabilitation Service. Division of Research Utilization and published by . This book was released on 1972 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Census Use Study Handbook for Manpower Planners

Author : United States. Bureau of the Census
Publisher :
ISBN 13 :
Total Pages : 120 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Census Use Study Handbook for Manpower Planners by : United States. Bureau of the Census

Download or read book Census Use Study Handbook for Manpower Planners written by United States. Bureau of the Census and published by . This book was released on 1972 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Solar Electric Propulsion Mission Architectures

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721583942
Total Pages : 34 pages
Book Rating : 4.5/5 (839 download)

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Book Synopsis Solar Electric Propulsion Mission Architectures by : National Aeronautics and Space Administration (NASA)

Download or read book Solar Electric Propulsion Mission Architectures written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: This presentation reviews Solar Electric Propulsion (SEP) Mission Architectures with a slant towards power system technologies and challenges. The low-mass, high-performance attributes of SEP systems have attracted spacecraft designers and mission planners alike and have led to a myriad of proposed Earth orbiting and planetary exploration missions. These SEP missions are discussed from the earliest missions in the 1960's, to first demonstrate electric thrusters, to the multi-megawatt missions envisioned many decades hence. The technical challenges and benefits of applying high-voltage arrays, thin film and low-intensity, low-temperature (LILT) photovoltaics, gossamer structure solar arrays, thruster articulating systems and microsat systems to SEP spacecraft power system designs are addressed. The overarching conclusion from this review is that SEP systems enhance, and many times enable, a wide class of space missions. Kerslake, Thomas W. Glenn Research Center NASA/TM-2003-212456, NAS 1.15:212456, E-13995

Gun Control Act

Author :
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Gun Control Act by :

Download or read book Gun Control Act written by and published by . This book was released on 1972 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Solar Electric Propulsion Mission Architectures

Author :
Publisher :
ISBN 13 :
Total Pages : 22 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Solar Electric Propulsion Mission Architectures by :

Download or read book Solar Electric Propulsion Mission Architectures written by and published by . This book was released on 2003 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:

1987 census of agriculture

Author :
Publisher :
ISBN 13 :
Total Pages : 250 pages
Book Rating : 4.M/5 ( download)

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Book Synopsis 1987 census of agriculture by :

Download or read book 1987 census of agriculture written by and published by . This book was released on 1989 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Solar Power System Options for the Radiation and Technology Demonstration Spacecraft

Author :
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Solar Power System Options for the Radiation and Technology Demonstration Spacecraft by :

Download or read book Solar Power System Options for the Radiation and Technology Demonstration Spacecraft written by and published by . This book was released on 2000 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Advanced Electric Propulsion for Space Solar Power Satellites

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721193042
Total Pages : 30 pages
Book Rating : 4.1/5 (93 download)

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Book Synopsis Advanced Electric Propulsion for Space Solar Power Satellites by : National Aeronautics and Space Administration (NASA)

Download or read book Advanced Electric Propulsion for Space Solar Power Satellites written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sun tower concept of collecting solar energy in space and beaming it down for commercial use will require very affordable in-space as well as earth-to-orbit transportation. Advanced electric propulsion using a 200 kW power and propulsion system added to the sun tower nodes can provide a factor of two reduction in the required number of launch vehicles when compared to in-space cryogenic chemical systems. In addition, the total time required to launch and deliver the complete sun tower system is of the same order of magnitude using high power electric propulsion or cryogenic chemical propulsion: around one year. Advanced electric propulsion can also be used to minimize the stationkeeping propulsion system mass for this unique space platform. 50 to 100 kW class Hall, ion, magnetoplasmadynamic, and pulsed inductive thrusters are compared. High power Hall thruster technology provides the best mix of launches saved and shortest ground to Geosynchronous Earth Orbital Environment (GEO) delivery time of all the systems, including chemical. More detailed studies comparing launch vehicle costs, transfer operations costs, and propulsion system costs and complexities must be made to down-select a technology. The concept of adding electric propulsion to the sun tower nodes was compared to a concept using re-useable electric propulsion tugs for Low Earth Orbital Environment (LEO) to GEO transfer. While the tug concept would reduce the total number of required propulsion systems, more launchers and notably longer LEO to GEO and complete sun tower ground to GEO times would be required. The tugs would also need more complex, longer life propulsion systems and the ability to dock with sun tower nodes. Oleson, Steve Glenn Research Center NASA/TM-1999-209307, E-11833, NAS 1.15:209307, AIAA Paper 99-2872

Performance of Solar Electric Powered Deep Space Missions Using Hall Thruster Propulsion

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781720660897
Total Pages : 28 pages
Book Rating : 4.6/5 (68 download)

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Book Synopsis Performance of Solar Electric Powered Deep Space Missions Using Hall Thruster Propulsion by : National Aeronautics and Space Administration (NASA)

Download or read book Performance of Solar Electric Powered Deep Space Missions Using Hall Thruster Propulsion written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-04 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Power limited, low-thrust trajectories were assessed for missions to Jupiter, Saturn, and Neptune utilizing a single Venus Gravity Assist (VGA) and a primary propulsion system based on either a 3-kW high voltage Hall thruster, of the type being developed by the NASA In-Space Propulsion Technology Program, or an 8-kW variant of this thruster. These Hall thrusters operate with specific impulses below 3,000 seconds. A trade study was conducted to examine mission parameters that include: net delivered mass (NDM), beginning-of-life (BOL) solar array power, heliocentric transfer time, required launch vehicle, number of operating thrusters, and throttle profile. The top performing spacecraft configuration was defined to be the one that delivered the highest mass for a range of transfer times. In order to evaluate the potential future benefit of using next generation Hall thrusters as the primary propulsion system, comparisons were made with the advanced state-of-the-art (ASOA), 7-kW, 4,100 second NASA's Evolutionary Xenon Thruster (NEXT) for the same mission scenarios. For the BOL array powers considered in this study (less than 30 kW), the results show that the performance of the Hall thrusters, relative to NEXT, is largely dependant on the performance capability of the launch vehicle, and that at least a 10 percent performance gain, equating to at least an additional 200 kg dry mass at each target planet, is achieved over the higher specific impulse NEXT when launched on an Atlas 551.Witzberger, Kevin E. and Manzella, DavidGlenn Research CenterHALL THRUSTERS; SOLAR ELECTRIC PROPULSION; DEEP SPACE 1 MISSION; SPACECRAFT CONFIGURATIONS; NASA SPACE PROGRAMS; SOLAR ARRAYS; POWER CONDITIONING; MATHEMATICAL MODELS; SPECIFIC IMPULSE; HIGH VOLTAGES; NEPTUNE (PLANET); SATURN (PLANET); LAUNCH VEHICLES

Electrical Systems Analysis at NASA Glenn Research Center

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721584987
Total Pages : 32 pages
Book Rating : 4.5/5 (849 download)

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Book Synopsis Electrical Systems Analysis at NASA Glenn Research Center by : National Aeronautics and Space Administration (NASA)

Download or read book Electrical Systems Analysis at NASA Glenn Research Center written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis of an electrical power and propulsion system for a 2-place general aviation aircraft is presented to provide a status of such modeling at NASA Glenn Research Center. The thermodynamic/ electrical model and mass prediction tools are described and the resulting system power and mass are shown. Three technology levels are used to predict the effect of advancements in component technology. Methods of fuel storage are compared by mass and volume. Prospects for future model development and validation at NASA as well as possible applications are also summarized. Freeh, Joshua E. and Liang, Anita D. and Berton, Jeffrey J. and Wickenheiser, Timothy J. Glenn Research Center NASA/TM-2003-212520, E-14082, NAS 1.15:212520

Mass Study for Modular Approaches to a Solar Electric Propulsion Module

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781725989924
Total Pages : 38 pages
Book Rating : 4.9/5 (899 download)

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Book Synopsis Mass Study for Modular Approaches to a Solar Electric Propulsion Module by : National Aeronautics and Space Administration (NASA)

Download or read book Mass Study for Modular Approaches to a Solar Electric Propulsion Module written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-22 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The propulsion module comprises six to eight 30-cm thruster and power processing units, a mercury propellant storage and distribution system, a solar array ranging in power from 18 to 25 kW, and the thermal and structure systems required to support the thrust and power subsystems. Launch and on-orbit configurations are presented for both modular approaches. The propulsion module satisfies the thermal design requirements of a multimission set including: Mercury, Saturn, and Jupiter orbiters, a 1-AU solar observatory, and comet and asteroid rendezvous. A detailed mass breakdown and a mass equation relating the total mass to the number of thrusters and solar array power requirement is given for both approaches. Sharp, G. R. and Cake, J. E. and Oglebay, J. C. and Shaker, F. J. Glenn Research Center NASA-TM-X-3473, E-8800 RTOP 506-22...

Electric Propulsion for International Space Station Reboost

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721294961
Total Pages : 32 pages
Book Rating : 4.2/5 (949 download)

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Book Synopsis Electric Propulsion for International Space Station Reboost by : National Aeronautics and Space Administration (NASA)

Download or read book Electric Propulsion for International Space Station Reboost written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electric propulsion has recently been revisited for reboost of space station due to its high fuel efficiency. This paper focuses upon the propulsion system and orbit analysis trades undertaken at the beginning of a study to show the relative performance of potential electric propulsion system. A code was developed to analyze continuous low thrust reboost of space station with various electric propulsion systems at various power levels. Analysis showed that a major portion of reboost of space station can be made using electric propulsion systems with 0.5 N of continuous thrust. 1.0 N of EP thrust can provide almost the entire reboost mission, Three electric propulsion systems at various total power levels were chosen for further investigation: N2H4 arcjets at 5 kW, xenon Hall at 10 kW, and xenon ion thrusters at 20 kW. They were chosen for their ability to reduce the internationally launched chemical reboost fuel by 50% or more. Oleson, Steven R. and Benson, Scott W. Glenn Research Center NASA/TM-2002-211313, E-13117, NAS 1.15:211313, AIAA Paper 2001-3644