Download or read book Stability of a Gravity Gradient Satellite in an Elliptic Orbit written by Michael Harry Hill and published by . This book was released on 1970 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Capture and Stability of a Gravity gradient Satellite in an Eccentric Orbit written by D. K. Anand and published by . This book was released on 1968 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper reports on the investigation of the capture and gravity-gradient stabilization of a satellite in an orbit with an eccentricity of 0.2. The satellite is called LIDOS, and its mission is to obtain geodetic information. The orbit eccentricity gives rise principally to pitch librations. The amplitude of these librations is about 0.26 radian, which represents the minimum solution to the equation of planar librations. For an optimum selection of mass distribution and adverse orbital conditions, all the perturbations combine to cause peak roll amplitudes of 0.27 radian and close to two revolutions in yaw per orbit, in addition to the above mentioned pitch librations. Owing to the large eccentricity, the region of stability, and consequently capture, is small. Furthermore, the obtaining of 1 revolution per orbit by conventional methods of inertia changes does not insure successful gravity-gradient stabilization. Therefore, an electromagnet is employed to maneuver the satellite into the stable region before capture. This is shown by phase plane representation. (Author).

Download or read book On the Libration of a Gravity Gradient Stabilized Spacecraft in an Eccentric Orbit written by Albert J. Fleig (Jr.) and published by . This book was released on 1970 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: General analytical methods for predicting planar and three dimensional attitude motion of a gravity gradient spacecraft in an elliptical orbit are developed. Regions of stability from the linearized planar equation of Mathieu form are plotted versus inertia parameters and orbit eccentricity. Similar plots showing the effects of damping are presented. The planar equation for larger eccentricities is examined with asymptotic expansion methods (KBM) for increased accuracy. An analysis based on the Hamiltonian and using canonical transformations and the method of averaging is applied to the three degree of freedom equations. Thirty-two combinations of resonant eigenfrequencies, indicating both nonlinear and parametric resonances, and including six previously shown by Breakwell and Pringle, are found. Nineteen of these combinations lead to unbounded increases in the amplitude of oscillation of one or more of the spacecraft modes. Eight lead to significant interchanges of energy between modes. The remaining five have little effect.

Download or read book The Application of Gravity Gradient Stabilization to Satellites in Highly Elliptic Orbits written by Robert Edgar Lohfeld and published by . This book was released on 1972 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Generalized Approach to Gravity gradient Stabilization of Gyrostat Satellites written by Richard W. Longman and published by . This book was released on 1969 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Capture and Stability of the LIDOS Gravity gradient Satellite in an Eccentric Orbit written by D. K. Anand and published by . This book was released on 1969 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Instability of a gravity gradient satellite due to thermal distortion written by Robert L. Goldman and published by . This book was released on 1975 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On the Motion and Stability of a Multiple Connected Gravity gradient Satellite with Passive Damping written by Peter M. Bainum and published by . This book was released on 1966 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: A generalized analytical method is formulated for studying the motion and stability of a gravity-gradient satellite inertially connected with one or two gimballed damping booms which are assumed to be hinged at or very near the system center of mass; it is the relative motion between these connected bodies which affords a means of dissipating the librational energy. (An experimental satellite, called DODGE, employing the single damper boom will be launched in 1967). The equations of rotational motion are derived using Lagrange's general formulation, where the system center of mass is assumed to be in a circular orbit. Included are the effects of the gravitational restoring torques, the dissipative torques, and the gyroscopic torques that result from the coupling between the orbital angular velocity and the rotational motion in pitch-roll-yaw referenced to a local vertical frame. The equations are then linearized under suitable small angle assumptions to consider the motion and stability in the vicinity of the equilibrium point. The stability of the linear system is analyzed using both the methods of Routh-Hurwitz and Lyapunov's second or direct method. An extension of the linearized theory considers the stability of a particular nonlinear system, and examines the capture from zero inertial angular rate. Expressions are developed for the thermal deflections of the extendible booms and the torques resulting from the interaction of solar radiation forces with the bent booms. The stability criterion developed for the linear system is extended to consider the (assumed) continuously acting solar torques. This is achieved with an application of Malkin's theorem. (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 284 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 Gravity Gradient Effects on Some of the Basic Stability Requirements for an Orbital Satellite Having Long Flexible Antennae written by James Clarence Kennedy and published by . This book was released on 1967 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 The Attitude Motion and Stability of a Spinning Satellite Under the Influence of the Earth s Gravity Gradient Torque written by Paul B. Chin and published by . This book was released on 1962 with total page 264 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 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 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 Gravity Gradient Effects on Some of the Basic Stability Requirements for an Orbiting Satellite Having Long Flexible Antennae written by James Clarence Kennedy and published by . This book was released on 1967 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: