Download or read book Optimized Performance of an Articulated Gravity Gradient Satellite at Synchronous Altitude microform written by P. C. Hughes and published by National Library of Canada. This book was released on 1966 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: A geometrically and dynamically symmetrical articulated satellite is considered for possible application at synchronous altitudes. The perturbing influence of solar radiation pressure on the two vertical hinged booms is studied, and the small-angle equations of motion derived. From these equations, both the transient and steady-state pointing performance are optimized through a computer search. Pointing errors of the order of two degrees, and damping times less than one orbit are shown to be possible for a weight expenditure of forty-five pounds (satellite payload weight = 250 pounds). (Author).

Download or read book Optimized Performance of an Articulated Gravity Gradient Satellite at Synchronous Altitude written by P. C. Hughes and published by . This book was released on 1966 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: A geometrically and dynamically symmetrical articulated satellite is considered for possible application at synchronous altitudes. The perturbing influence of solar radiation pressure on the two vertical hinged booms is studied, and the small-angle equations of motion derived. From these equations, both the transient and steady-state pointing performance are optimized through a computer search. Pointing errors of the order of two degrees, and damping times less than one orbit are shown to be possible for a weight expenditure of forty-five pounds (satellite payload weight = 250 pounds). (Author).

Download or read book Optimized performance of an articulated gravity gradient satelite at synchronous altitude written by Peter Carlisle Hughes and published by . This book was released on 1966 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On the Use of Flexible Strings in Gravity gradient Stabilization Systems written by Garg, S. C and published by Institute for Aerospace Studies, University of Toronto. This book was released on 1969 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: A related family of three gravity-gradient-stabilized synchronous equatorial satellites is analyzed considering small-angle attitude dynamics in the orbital plane. A characteristic feature is the use of long thin perfectly flexible strings to achieve the desired mass distribution, which eliminates the solar radiation pressure and heating effects inherent in conventional rigid-boom designs. Damping is achieved by articulated hinges and magnetically-anchored viscous fluid dampers. The designs are optimized using a numerical gradient-search technique and considering the time to damp to half amplitude of the least-damped mode as the performance index. The pointing performance is found to be relatively insensitive to parameter variations. Optimized results are presented for a series of constrained satellite configurations. (Author).

Download or read book Optimization of Manned Orbital Satellite Vehicle Design with Respect to Artificial Gravity written by Benjamin J. Loret and published by . This book was released on 1961 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: A design envelope is established as the result of a human factors analysis of the artificial gravity environment peculiar to rotating space vehicles. The envelope is prescribed by: an upper limit on vehicle angular velocity of 0.4 radian/second to minimize the occurrence of ''canal sickness''; a basic upper limit on artificial gravity of 1 g; and a basic lower limit on artificial gravity of 0.2 g as the lowest value of g at which man can walk unaided. Both g-limits are modified to compensate for Coriolis forces which cause variation in g-level for tangential walking inside the rotating vehicle. An upper limit on vehicle radius of 180 feet is established on the basis of engineering practicality. The optimum vehicle configuration is established as a Modified Axially Expanded Dumbbell, characterized by a single, cylindrical, living-working compartment oriented parallel to the spin axis, counterbalanced by other vehicle components. The configuration is illustrated in the conceptual Pseudo-Geogravitational Vehicle, which has a radius of 180 feet a d an operational angular velocity of 0.4 radian/second to produce 0.9 g in th livi g-working compartment. (Author)

Download or read book Canadiana written by and published by . This book was released on 1963 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts written by and published by . This book was released on 1967 with total page 1018 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gravity Gradient Stabilization Studies with the Dodge Satellite written by Robert E. Fischell and published by . This book was released on 1970 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: The DODGE satellite was launched on 1 July 1967 into a near-synchronous orbit to demonstrate gravity-gradient stabilization at that high altitude and to experiment with various design parameters and damping techniques. This satellite was the first to be three-axis stabilized at high altitude using gravity-gradient techniques. It continues to function satisfactorily to the present date. Stabilization in pitch and roll to better than plus or minus 10 degrees has been obtained. The yaw stabilization of plus or minus 45 degrees has been fairly consistent; with the assistance of a small angular momentum flywheel, yaw accuracy of plus or minus 20 degrees was achieved. Magnetic damping of the sample-and-hold type and simulated hysteresis were both successful in damping librations. Efforts with the torsion-wire-suspended damper boom scheme were not successful, probably because of a mechanical bias in the device. A television camera system permitted observation of the boom bending under the influence of solar heating. Mechanical hysteresis in the boom bending was observed. (Author).

Download or read book Comprehensive Dissertation Index 1861 1972 Engineering general and aeronautical written by Xerox University Microfilms and published by . This book was released on 1973 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book National Union Catalog written by and published by . This book was released on 1968 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes entries for maps and atlases.

Download or read book American Doctoral Dissertations written by and published by . This book was released on 1966 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dissertation Abstracts International written by and published by . This book was released on 1970 with total page 1776 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The National union catalog 1968 1972 written by and published by . This book was released on 1973 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Materials and Processes written by Barrie D. Dunn and published by Springer. This book was released on 2015-12-29 with total page 677 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this book is to assist scientists and engineers select the ideal material or manufacturing process for particular applications; these could cover a wide range of fields, from light-weight structures to electronic hardware. The book will help in problem solving as it also presents more than 100 case studies and failure investigations from the space sector that can, by analogy, be applied to other industries. Difficult-to-find material data is included for reference. The sciences of metallic (primarily) and organic materials presented throughout the book demonstrate how they can be applied as an integral part of spacecraft product assurance schemes, which involve quality, material and processes evaluations, and the selection of mechanical and component parts. In this successor edition, which has been revised and updated, engineering problems associated with critical spacecraft hardware and the space environment are highlighted by over 500 illustrations including micrographs and fractographs. Space hardware captured by astronauts and returned to Earth from long durations in space are examined. Information detailed in the Handbook is applicable to general terrestrial applications including consumer electronics as well as high reliability systems associated with aeronautics, medical equipment and ground transportation. This Handbook is also directed to those involved in maximizing the relia bility of new materials and processes for space technology and space engineering. It will be invaluable to engineers concerned with the construction of advanced structures or mechanical and electronic sub-systems.

Download or read book Large Space Structures Systems in the Space Station Era written by and published by . This book was released on 1991 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comprehensive Dissertation Index 1861 1972 Author index written by Xerox University Microfilms and published by . This book was released on 1973 with total page 1090 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: