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Command Generation And Control Of Momentum Exchange Electrodynamic Reboost Tethered Satellite

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Command Generation and Control of Momentum Exchange Electrodynamic Reboost Tethered Satellite

Command Generation and Control of Momentum Exchange Electrodynamic Reboost Tethered Satellite Book
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Release : 2018-06-24
ISBN : 9781721802104
Language : En, Es, Fr & De

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Book Description :

The research completed for this NASA Graduate Student Research Program Fellowship sought to enhance the current state-of-the-art dynamic models and control laws for Momentum Exchange Electrodynamic Reboost satellite systems by utilizing command generation, specifically Input Shaping. The precise control of tethered spacecraft with flexible appendages is extremely difficult. The complexity is magnified many times when the satellite must interact with other satellites as in a momentum exchange via a tether. The Momentum Exchange Electronic Reboost Tether (MXER) concept encapsulates all of these challenging tasks [l]. Input Shaping is a command generation technique that allows flexible spacecraft to move without inducing residual vibration [2], limit transient deflection [3] and utilize fuel-efficient actuation [4]. Input shaping is implemented by convolving a sequence of impulses, known as the input shaper, with a desired system command to produce a shaped input that is then used to drive the system. This process is demonstrated in Figure 1. The shaped command is then use to drive the system without residual vibration while meeting many other performance specifications. The completed work developed tether control algorithms for retrieval. A simple model of the tether response has been developed and command shaping was implemented to minimize unwanted dynamics. A model of a flexible electrodynamic tether has been developed to investigate the tether s response during reboost. Command shaping techniques have been developed to eliminate the tether oscillations and reduce the tether s deflection to pre-specified levels during reboost. Additionally, a model for the spin-up of a tethered system was developed. This model was used in determining the parameters for optimization the resulting angular velocity. Robertson, Michael J. Marshall Space Flight Center

It s ONLY Rocket Science

It s ONLY Rocket Science Book
Author : Lucy Rogers
Publisher : Springer Science & Business Media
Release : 2008-03-08
ISBN : 0387753788
Language : En, Es, Fr & De

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Book Description :

Most amateur astronomers – and many of those with similar interests but who are not currently practising observers – have only a sketchy understanding of space flight. This book provides an introduction to its mechanics. The beauty of this book, written by an engineer who is also an accomplished science writer, is that it covers the subject comprehensively, and yet is almost entirely descriptive and non-mathematical. It deals with all aspects of space flight, from how to leave the Earth (including the design of the rocket, mission planning, navigation and communication), to life in space and the effects of weightlessness. The book also includes sections describing how an amateur can track satellites and understand their orbital parameters.

Commerce Business Daily

Commerce Business Daily Book
Author : Anonim
Publisher : Unknown
Release : 2001-12-03
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Commerce Business Daily book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Innovation Key to the Future

Innovation  Key to the Future Book
Author : Anonim
Publisher : Unknown
Release : 1992
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Innovation Key to the Future book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Space Technology and Applications International Forum STAIF 2002

Space Technology and Applications International Forum   STAIF 2002 Book
Author : Mohamed S. El-Genk
Publisher : American Institute of Physics
Release : 2002-01-31
ISBN : 9780735400528
Language : En, Es, Fr & De

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Book Description :

The proceedings document the most recent publications in a number of key areas of space technology, space nuclear power and propulsion systems and technology, solar system exploration technology, and advanced an innovative propulsion concepts. The technical areas covered are the latest on the thermophysics in microgravity, space nuclear reactor power and propulsion systems for manned exploration of Mars and other distant planets in the solar system, static energy conversion technology on segmented thermoelectric, thermionic, alkali metals as well as thermal to electric conversion. Additional areas include radioisotope power systems, and the recent advances in the technology of Stirling and Brayton engines for space nuclear power and propulsion, and next generation commerical/civil space transportation systems technology.