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Author : Peter R. Kurzhals,Carolyn Grantham
Publisher : Unknown
Page : 76 pages
File Size : 52,5 Mb
Release : 1966
Category : Astronautics
ISBN : UIUC:30112106772798
Author : Peter R. Kurzhals,Carolyn Grantham
Publisher : Unknown
Page : 76 pages
File Size : 52,5 Mb
Release : 1966
Category : Astronautics
ISBN : NASA:31769000422777
A system for inertial experiment pointing and attitude control (designated SIXPAC) of future manned spacecraft has been investigated. The SIXPAC concept consists of three double-gimbaled control moment gyros aligned with the axes of the spacecraft, and derives its control torques from precession of the gyro wheels. This system is readily mechanized, has inherent redundancy, and should provide a wider range of attitude control for manned spacecraft than the gyro systems previously considered. The SIXPAC can provide both the large range of control torques and the fine attitude holds associated with spacecraft experiments such as earth-surface tracking and mapping, photographic missions, and astronomical observations. Periodic aerodynamic and gravity-gradient torques can also be counteracted by the proposed system. Redundancies inherent to the three-gyro arrangement further allow reduced spacecraft control in case of failure or shutdown of one of the three gyros. The complete equations of motion for a spacecraft with the SIXPAC were developed, and were integrated numerically on a digital computer for an example mission with a possible Apollo applications concept. Results of this computer study were used to evaluate the spacecraft and control system response and to determine the power and fuel consumption of the SIXPAC. Characteristics time histories of the attitude and angular rates of the spacecraft are presented for a number of experiments that have been proposed for typical Apollo applications missions, and the performance of the gyro system is analyzed during the control tasks associated with these experiments.
Author : John Hrastar
Publisher : Unknown
Page : 36 pages
File Size : 44,5 Mb
Release : 1970
Category : Algorithms
ISBN : UIUC:30112106879593
A strapdown inertial reference system and an onboard digital computer can be used to change the attitude of a spacecraft over large angles in an arbitrary direction. A study was conducted with an advanced Orbiting Astronomical Observatory (OAO) using a three-axis control law previously proven globally stable. The control system can reorient the spacecraft to an arbitrary inertial attitude with a single command by operating the three momentum wheels simultaneously. Reorientation, therefore, becomes a simple extension of a hold or pointing mode. The time required for reorientation with this system is considerably shorter than the time required for a series of single-axis slews. The spacecraft attitude and control law are continuously updated by the onboard computer's using information provided by the strapdown inertial reference system. The use of a computer and inertial reference system with characteristics of systems presently under development demonstrates the feasibility of orientation with such a reference system. The basic system is not limited to the OAO but may be adapted for other three-axis-stabilized spacecraft.
Author : Anonim
Publisher : Unknown
Page : 550 pages
File Size : 54,6 Mb
Release : 1966
Category : Aerodynamics
ISBN : MINN:319510008466314
Author : Anonim
Publisher : Unknown
Page : 1370 pages
File Size : 40,6 Mb
Release : 1981
Category : Aeronautics
ISBN : UIUC:30112075691037
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : United States. National Aeronautics and Space Administration Scientific and Technical Information Division
Publisher : Unknown
Page : 2300 pages
File Size : 45,9 Mb
Release : 1967
Category : Aeronautics
ISBN : STANFORD:36105113793777
Author : Yaguang Yang
Publisher : CRC Press
Page : 159 pages
File Size : 53,5 Mb
Release : 2019-02-06
Category : Science
ISBN : 9780429822131
This book discusses all spacecraft attitude control-related topics: spacecraft (including attitude measurements, actuator, and disturbance torques), modeling, spacecraft attitude determination and estimation, and spacecraft attitude controls. Unlike other books addressing these topics, this book focuses on quaternion-based methods because of its many merits. The book lays a brief, but necessary background on rotation sequence representations and frequently used reference frames that form the foundation of spacecraft attitude description. It then discusses the fundamentals of attitude determination using vector measurements, various efficient (including very recently developed) attitude determination algorithms, and the instruments and methods of popular vector measurements. With available attitude measurements, attitude control designs for inertial point and nadir pointing are presented in terms of required torques which are independent of actuators in use. Given the required control torques, some actuators are not able to generate the accurate control torques, therefore, spacecraft attitude control design methods with achievable torques for these actuators (for example, magnetic torque bars and control moment gyros) are provided. Some rigorous controllability results are provided. The book also includes attitude control in some special maneuvers, such as orbital-raising, docking and rendezvous, that are normally not discussed in similar books. Almost all design methods are based on state-spaced modern control approaches, such as linear quadratic optimal control, robust pole assignment control, model predictive control, and gain scheduling control. Applications of these methods to spacecraft attitude control problems are provided. Appendices are provided for readers who are not familiar with these topics.
Author : United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Publisher : Unknown
Page : 2084 pages
File Size : 45,9 Mb
Release : 1967
Category : Aeronautics
ISBN : RUTGERS:39030031129879
Author : United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Publisher : Unknown
Page : 2088 pages
File Size : 43,7 Mb
Release : 1966
Category : Aeronautics
ISBN : CORNELL:31924057848834
Author : George C. Marshall Space Flight Center,United States. Office of Space Science and Applications
Publisher : Unknown
Page : 806 pages
File Size : 45,5 Mb
Release : 1970
Category : Orbiting astronomical observatories
ISBN : UIUC:30112007322149
Design optics and technology for large spaceborne astronomical telescopes.
Author : Anonim
Publisher : Unknown
Page : 1466 pages
File Size : 44,7 Mb
Release : 1966
Category : Government publications
ISBN : MINN:319510005782185
Author : United States. Superintendent of Documents
Publisher : Unknown
Page : 1320 pages
File Size : 55,5 Mb
Release : 1966
Category : Government publications
ISBN : WISC:89035089036
Author : Anonim
Publisher : Unknown
Page : 454 pages
File Size : 54,6 Mb
Release : 1974
Category : Aeronautics
ISBN : UOM:39015011855908
Author : Anonim
Publisher : Unknown
Page : 1014 pages
File Size : 50,7 Mb
Release : 1966-11
Category : Science
ISBN : NYPL:33433066455514
Author : United States. Congress. Senate. Select Committee on Small Business
Publisher : Unknown
Page : 572 pages
File Size : 40,8 Mb
Release : 1976
Category : Government publications
ISBN : PURD:32754078073727