Robust On-Off Pulse Control of Flexible Space Vehicles
Robust On-Off Pulse Control of Flexible Space Vehicles

Author: National Aeronautics and Space Adm Nasa

Publisher:

Published: 2018-11-14

Total Pages: 132

ISBN-13: 9781731313140

DOWNLOAD EBOOK

The on-off reaction jet control system is often used for attitude and orbital maneuvering of various spacecraft. Future space vehicles such as the orbital transfer vehicles, orbital maneuvering vehicles, and space station will extensively use reaction jets for orbital maneuvering and attitude stabilization. The proposed robust fuel- and time-optimal control algorithm is used for a three-mass spacing model of flexible spacecraft. A fuel-efficient on-off control logic is developed for robust rest-to-rest maneuver of a flexible vehicle with minimum excitation of structural modes. The first part of this report is concerned with the problem of selecting a proper pair of jets for practical trade-offs among the maneuvering time, fuel consumption, structural mode excitation, and performance robustness. A time-optimal control problem subject to parameter robustness constraints is formulated and solved. The second part of this report deals with obtaining parameter insensitive fuel- and time- optimal control inputs by solving a constrained optimization problem subject to robustness constraints. It is shown that sensitivity to modeling errors can be significantly reduced by the proposed, robustified open-loop control approach. The final part of this report deals with sliding mode control design for uncertain flexible structures. The benchmark problem of a flexible structure is used as an example for the feedback sliding mode controller design with bounded control inputs and robustness to parameter variations is investigated. Wie, Bong and Sinha, Ravi Unspecified Center ATTITUDE CONTROL; FLEXIBLE SPACECRAFT; JET CONTROL; ORBIT TRANSFER VEHICLES; ORBITAL MANEUVERING VEHICLES; ROBUSTNESS (MATHEMATICS); SPACE STATIONS; ALGORITHMS; ATTITUDE STABILITY; FEEDBACK CONTROL; OPTIMAL CONTROL; TIME OPTIMAL CONTROL...

Robust Control of Flexible Space Vehicles with Minimum Structural Excitation
Robust Control of Flexible Space Vehicles with Minimum Structural Excitation

Author: National Aeronautics and Space Administration (NASA)

Publisher: Createspace Independent Publishing Platform

Published: 2018-07-13

Total Pages: 96

ISBN-13: 9781722724665

DOWNLOAD EBOOK

Both feedback and feedforward control approaches for uncertain dynamical systems (in particular, with uncertainty in structural mode frequency) are investigated. The control objective is to achieve a fast settling time (high performance) and robustness (insensitivity) to plant uncertainty. Preshaping of an ideal, time optimal control input using a tapped-delay filter is shown to provide a fast settling time with robust performance. A robust, non-minimum-phase feedback controller is synthesized with particular emphasis on its proper implementation for a non-zero set-point control problem. It is shown that a properly designed, feedback controller performs well, as compared with a time optimal open loop controller with special preshaping for performance robustness. Also included are two separate papers by the same authors on this subject. Wie, Bong and Liu, Qiang Unspecified Center...

Space Vehicle Dynamics and Control
Space Vehicle Dynamics and Control

Author: Bong Wie

Publisher: AIAA

Published: 1998

Total Pages: 692

ISBN-13: 9781563472619

DOWNLOAD EBOOK

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

Scientific and Technical Aerospace Reports
Scientific and Technical Aerospace Reports

Author:

Publisher:

Published: 1995

Total Pages: 652

ISBN-13:

DOWNLOAD EBOOK

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.

Advances in Spacecraft Systems and Orbit Determination
Advances in Spacecraft Systems and Orbit Determination

Author: Rushi Ghadawala

Publisher: BoD – Books on Demand

Published: 2012-03-23

Total Pages: 280

ISBN-13: 9535103806

DOWNLOAD EBOOK

"Advances in Spacecraft Systems and Orbit Determinations", discusses the development of new technologies and the limitations of the present technology, used for interplanetary missions. Various experts have contributed to develop the bridge between present limitations and technology growth to overcome the limitations. Key features of this book inform us about the orbit determination techniques based on a smooth research based on astrophysics. The book also provides a detailed overview on Spacecraft Systems including reliability of low-cost AOCS, sliding mode controlling and a new view on attitude controller design based on sliding mode, with thrusters. It also provides a technological roadmap for HVAC optimization. The book also gives an excellent overview of resolving the difficulties for interplanetary missions with the comparison of present technologies and new advancements. Overall, this will be very much interesting book to explore the roadmap of technological growth in spacecraft systems.