Download or read book Hybrid Magnetic Attitude Controller for Low Earth Orbit Satellites Using the Time varying Linear Quadratic Regulator written by Nitin Seth and published by . This book was released on 2009 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Satellite Attitude Control Using Magnetic Torquers a Periodic Time Varying Control Problem written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Satellite attitude controllers have been designed for a rigid spacecraft whose only actuators are magnetic torque rods. This effort's goals have been to develop a new class of lightweight, moderate accuracy attitude controllers and to evaluate and further develop general methods for the control of time varying systems. Three different classes of controllers have been developed and simulation tested. one based on linear quadratic regulator techniques, one based on sliding mode like concepts, and one based on new H infinity techniques for time varying systems. These H infinity controllers achieve the best performance. In addition to the controller design studies. the issue of attenuation of constant 3 axis disturbances has been addressed. Disturbance attenuation is difficult for this system because it can apply torques only about the 2 axes that are perpendicular to the Earth's magnetic field. It is a challenge to determine how best to counteract a low frequency 3 axis disturbance torque, on average, via judicious use of the fact that the Earth's magnetic field direction varies in time as the spacecraft moves along its orbit. Pointing accuracies on the order of 1 deg or better have been demonstrated in the presence of typical levels of disturbance torque.
Download or read book Hybrid Magnetic Attitude Control of Spacecraft written by Behrad Vatankhahghadim and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hybrid spacecraft attitude control schemes that combine magnetic torques with impulsive thrusting in an optimal or passive manner are developed. The optimal controller uses a hybrid linear quadratic regulator formulation, while explicitly accounting for a priori estimates of the disturbances. Previous results on optimal impulse timing are extended to remain valid under disturbance accommodation, and the special case of a multi-orbit mission with repeating impulse patterns is considered. The passivity-based approach relies on a hybrid and time-varying extension of Kalman-Yakubovich-Popov conditions, and judiciously designs the output dynamics to guarantee passivity of the plant and stability of the closed-loop system subject to sufficiently small disturbances. Lastly, input/output stability of the disturbance-accommodating controller and Lyapunov stability of the passive controller are studied by introducing a hybrid state transition matrix. Extensions of the classical Floquet theory and its counterpart for inhomogeneous systems provide stability analysis tools for the proposed hybrid controllers.
Download or read book Technology for Large Space Systems written by and published by . This book was released on 1987 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Magnetic Attitude Control For Spacecraft with Flexible Appendages written by Julian Pierre Stellini and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1994 with total page 390 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 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Linear Time Varying Approach Satellite Attitude Control Using Only Electromagnetic Actuation written by R. Wisniewski and published by . This book was released on 1997 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Linear time varying approach satellite attitude control using only electromagnetic actuation written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA SP written by and published by . This book was released on 1962 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Linear Time Varying Approach to Satellite Attitude Control Using Only Electromagnetic Actuation written by Rafał Wiśniewski and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technology for Large Space Systems A Bibliography with Indexes supplement 18 written by and published by . This book was released on 1988 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Discrete Time Control of a Spacecraft With Retargetable Flexible Antennas written by Martin E. B. France and published by . This book was released on 1989 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation considers the discrete-time control of a spacecraft consisting of a rigid platform with retargetable flexible antennas. The mission consists of independent minimum-time maneuvers of each antenna to coincide with predetermined lines of sight, while the platform is stabilized in an inertial space and elastic vibration of the antennas is suppressed. The system is governed by a set of linearized time-varying equations of motion. A discrete-time approach permits consideration of the time-varying nature of the system in designing the control law. Both global and decentralized controls are proposed for a noise-free system with full-state feedback. Initially, a time-varying linear-quadratic regulator (LQR) is implemented, followed by two types of decentralized controllers. (EMK).
Download or read book Space Vehicle Dynamics and Control written by Bong Wie and published by AIAA. This book was released on 1998 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: A textbook that incorporates the latest methods used for the analysis of spacecraft orbital, attitude, and structural dynamics and control. Spacecraft dynamics is treated as a dynamic system with emphasis on practical applications, typical examples of which are the analysis and redesign of the pointing control system of the Hubble Space Telescope and the analysis of an active vibrations control for the COFS (Control of Flexible Structures) Mast Flight System. In addition to the three subjects mentioned above, dynamic systems modeling, analysis, and control are also discussed. Annotation copyrighted by Book News, Inc., Portland, OR
Download or read book Decoupled and Linear Quadratic Regulator Control of a Large Flexible Space Antenna with an Observer in the Control Loop written by and published by . This book was released on 1985 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
