Download or read book A System for Passive Gravity gradient Stabiliza Tion of Earth Satellites written by Robert E. Fischell and published by . This book was released on 1963 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The satellite 1963 22A was successfully captured into a condition of passive, gravity-gradient stabilization. All elements of the stabilization system, including magnetic dispin, magnetic orientation devices, the extendible boom, the damping spring, and the attitude detection system performed satisfactorily. An unexpected high frequency oscillation of the boom and satellite system was observed which was most probably a dynamic effect resulting from thermal bending. This has caused the satellite to stabilize with a maximum deviation off the vertical of approximately 10 degrees. The objective of the gravity-gradient stabilization for the 22A satellite was to have the antennas directed downward within 20 degrees of the local vertical at all times. This objective has been successfully accomplished by the satellite's passive gravity-gradient attitude stabilization system. (Author).

Download or read book Symposium on Passive Gravity Gradient Stabilization Ames Research Center Moffett Field California May 10 11 1965 written by and published by . This book was released on 1966 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Symposium on Passive Gravity Gradient Stabilization Ames Research Center Moffett Field California May 10 11 1965 written by and published by . This book was released on 1966 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Orbital Results from Gravity gradient Stabilized Satellites written by Frederick F. Mobley and published by . This book was released on 1966 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: The possibility of using the earth's gravity field for vertical stabilization of near-earth satellites has intrigued theoreticians for many years. The very small stabilizing torque available and the lack of a natural damping mechanism have been recognized as the major problems. The satellite 1963-22A, launched in June 1963, was the first orbiting vehicle to achieve passive gravity-gradient stabilization. A 100-foot extendible boom was used to develop gravity-gradient stabilizing torque. A combination of a lossy spring and magnetic hysteresis rods provided damping. By June 1964 four other satellites had achieved gravity-gradient stabilization. The satellite 1964-26A was similar to 1963-22A except that good damping was achieved with magnetic hysteresis rods alone. The discovery that several slender rods of magnetic material, weighing only 0.6 pounds and entirely passive, would damp gravity-gradient librations by interaction with the earth's magnetic field was a major advance in space technology. The accuracy of vertical stabilization has typically been better than 10 degrees. (Author).

Download or read book Torques and Attitude Sensing in Earth Satellites written by S. Fred Singer and published by Elsevier. This book was released on 2012-12-02 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applied Mathematics and Mechanics, Volume 7: Torques and Attitude Sensing in Earth Satellites focuses on the possible torques that can affect the angular momentum of an Earth satellite. This book provides an understanding of the environment in which a satellite operates. Organized into 16 chapters, this volume starts with an overview of the application of force-free motion to space programs. This text then discusses the torque effects of a gravitational field, particularly with its gradient. Other chapters consider a particular method of gravity-gradient stabilization that utilizes a passive device to damp librations and thereby attain a vertical orientation. This book discusses as well the effects of the geomagnetic field on the angular motion of a satellite. The reader is also introduced to the method of magnetic attitude control employed in the Tiros satellite. The final chapter deals with the problem of horizon sensing, which is important for satellites requiring Earth stabilization. Astrophysicists will find this book useful.

Download or read book Gravity Gradient Stabilization written by Robert E. Roberson and published by . This book was released on 1965 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Estimation and Prediction of the Attitude of a Passive Gravity stabilized Satellite written by Bruce E. Tinling and published by . This book was released on 1969 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Method for predicting attitude of passive gravity stabilized satellite.

Download or read book Passive Aerodynamic Attitude Stabilization of Near Earth Satellites written by D. M. Schrello and published by . This book was released on 1961 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stabilization System Analysis and Performance of the Geos A Gravity gradient Satellite Explorer XXIX written by V. L. Pisacanne and published by . This book was released on 1967 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Perturbations of a Gravity Gradient Stabilization System written by Richard Henry Frick and published by . This book was released on 1965 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: Satellite attitude stabilization systems utilizing the gradient of the earth's gravitational field have the advantage of being completely passive (i.e., no power is required). However, the stabilizing moments developed are extremely small and as a result such systems are subject to attitude perturbations from sources which would ordinarily be neglected in the evaluation of an active stabilization system. This memorandum investigates certain of these sources of attitude perturbation including micro-meteoroid impact, solar radiation pressure, stationkeeping propulsion, orbital eccentricity, and on-board rotating machinery. In the analysis, formulas are developed which determine the magnitude of the pitch, roll and yaw perturbations resulting from each of the above sources. Application of these results to an assumed vehicle configuration shows that the resulting attitude perturbations can be of the order of several degrees. While these perturbations do not necessarily rule out gravity gradient stabilization, their magnitudes for a given vehicle configuration should be considered for their compatibility with the mission requirements. (Author).

Download or read book Passive Gravity gradient Libration Dampers Space Vehicle Design Criteria guidance and Control written by and published by . This book was released on 1971 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis of a Passive Gravity Gradient Satellite Attitude Control System written by Roza Hashemian and published by . This book was released on 1965 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Symposium on Passive Gravity Gradient Stabilization written by and published by . This book was released on 1966 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stabilization System Analysis and Performance of the GEOS A Gravity gradient Satellite Explorer XXIX written by and published by . This book was released on 1967 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Model Problem on the Response Speed and Accuracy of a Satellite Gravity Gradient Stabilization System written by K. V. Lukanin and published by . This book was released on 1971 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report investigates the attitude performance of an earth orbiting gravity-gradient spacecraft. First the transient response is determined for a system which has damping about one to three orthogonal axes and is in a circular orbit. The characteristic equation is utilized to find optimal values of the spacecraft's adjustable parameters. The transient response is also studied for the separate conditions of eccentric orbit, addition of a constant speed flywheel, and addition of torques due to atmospheric drag. Finally, improvement of the steady state pointing accuracy is considered. (Author).

Download or read book Spacecraft Dynamics and Control written by Marcel J. Sidi and published by Cambridge University Press. This book was released on 2000-07-03 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: Satellites are used increasingly in telecommunications, scientific research, surveillance, and meteorology, and these satellites rely heavily on the effectiveness of complex onboard control systems. This 1997 book explains the basic theory of spacecraft dynamics and control and the practical aspects of controlling a satellite. The emphasis throughout is on analyzing and solving real-world engineering problems. For example, the author discusses orbital and rotational dynamics of spacecraft under a variety of environmental conditions, along with the realistic constraints imposed by available hardware. Among the topics covered are orbital dynamics, attitude dynamics, gravity gradient stabilization, single and dual spin stabilization, attitude maneuvers, attitude stabilization, and structural dynamics and liquid sloshing.

Download or read book Attitude Stabilization for CubeSat written by Mohammed Chessab Mahdi and published by Cambridge Scholars Publishing. This book was released on 2018-11-14 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores CubeSat technology, and develops a nonlinear mathematical model of a spacecraft with the assumption that the satellite is a rigid body. It places emphasis on the CubeSat subsystem, orbit dynamics and perturbations, the satellite attitude dynamic and modeling, and components of attitude determination and the control subsystem. The book focuses on the attitude stabilization methods of spacecraft, and presents gravity gradient stabilization, aerodynamic stabilization, and permanent magnets stabilization as passive stabilization methods, and spin stabilization and three axis stabilization as active stabilization methods. It also discusses the need to develop a control system design, and describes the design of three controller configurations, namely the Proportional–Integral–Derivative Controller (PID), the Linear Quadratic Regulator (LQR), and the Fuzzy Logic Controller (FLC) and how they can be used to design the attitude control of CubeSat three-axis stabilization. Furthermore, it presents the design of a suitable attitude stabilization system by combining gravity gradient stabilization with magnetic torquing, and the design of magnetic coils which can be added in order to improve the accuracy of attitude stabilization. The book then investigates, simulates, and compares possible controller configurations that can be used to control the currents of magnetic coils when magnetic coils behave as the actuator of the system.