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High Performance Robust Control Of Flexible Space Structures

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High Performance Robust Control Of Flexible Space Structures

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Author : Mark S. Whorton
language : en
Publisher:
Release Date : 1997

High Performance Robust Control Of Flexible Space Structures written by Mark S. Whorton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Aerodynamics categories.

Many spacecraft systems have ambitious objectives that place stringent requirements in terms of pointing and vibration control systems. Because of the difficulty of obtaining accurate models for flexible space structures, limitations must be placed on performance in order to ensure stability. In some cases, to achieve sufficiently high performance to accomplish mission objectives will require the ability to refine the control design model based on closed-loop test data and tune the controller based on the refined model. The objective of this thesis is to develop a procedure for control system design which maximizes achievable performance with robust stability guarantees. Two facts of this dissertation are control design and system identification. A control design and system identification. A control design procedure is developed based on mixed H2/H[Infinite symbol] [subscript] optimization which is used to design a set of controllers which explicitly trade between nominal performance and robust stability. A homotopy algorithm is presented which generates a trajectory of gains along the boundary which trades between robustness and performance. This set of controllers may be implemented to determine the maximum achievable performance for a given model error bound. Examples are given which show that a better balance between robustness and performance is obtained using the mixed H2/H[Infinite symbol][subscript] design method than either H2 or ư-synthesis control design. A second contribution of this dissertation is a new procedure for closed-loop system identification. Using closed-loop response data, the parameters of a control design model in a canonical realization are refined. Examples are provided to demonstrate the convergence of the parameter esimation and improved performance realized by using the refined model for controller redesign. These developments result in an effective mechanism for achieving high performance control of flexible space structures.

High Performance Robust Control Of Flexible Space Structures

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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-08

High Performance Robust Control Of Flexible Space Structures written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-08 with categories.

Many spacecraft systems have ambitious objectives that place stringent requirements on control systems. Achievable performance is often limited because of difficulty of obtaining accurate models for flexible space structures. To achieve sufficiently high performance to accomplish mission objectives may require the ability to refine the control design model based on closed-loop test data and tune the controller based on the refined model. A control system design procedure is developed based on mixed H2/H(infinity) optimization to synthesize a set of controllers explicitly trading between nominal performance and robust stability. A homotopy algorithm is presented which generates a trajectory of gains that may be implemented to determine maximum achievable performance for a given model error bound. Examples show that a better balance between robustness and performance is obtained using the mixed H2/H(infinity) design method than either H2 or mu-synthesis control design. A second contribution is a new procedure for closed-loop system identification which refines parameters of a control design model in a canonical realization. Examples demonstrate convergence of the parameter estimation and improved performance realized by using the refined model for controller redesign. These developments result in an effective mechanism for achieving high-performance control of flexible space structures. Whorton, M. S. Marshall Space Flight Center...

Robust Control Of Flexible Space Vehicles With Minimum Structural Excitation

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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-13

Robust Control Of Flexible Space Vehicles With Minimum Structural Excitation written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-13 with categories.

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...

High Performance Robust Control Of Flexible Space Structures Msfc Center Director S Discretionary Fund

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Author :
language : en
Publisher:
Release Date : 1998

High Performance Robust Control Of Flexible Space Structures Msfc Center Director S Discretionary Fund written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.

Large Space Structures Systems In The Space Station Era

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Author :
language : en
Publisher:
Release Date : 1991

Large Space Structures Systems In The Space Station Era written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Large space structures (Astronautics) categories.

Frequency Domain Design Of Robust Controllers For Space Structures

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Author : William Howard Bennett
language : en
Publisher:
Release Date : 1989

Frequency Domain Design Of Robust Controllers For Space Structures written by William Howard Bennett and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Astronautics categories.

The purpose of the Phase 1 effort was to investigate and demonstrate the feasibility of a new class of computational algorithms for the design of high performance control laws for flexible space structures based on frequency response modeling and to consider advanced techniques for the implementation of real time control for precision (wide bandwidth) applications. Typical applications requiring advanced realtime control of flexible space structure include vibration suppression and isolation of payload subsystems. Performance of vibration suppression and isolation systems are critical factors effecting achievable levels of performance for space based optical systems. In the Phase 1 effort, a prototype software code was developed for testing computational algorithms for spectral factorization, causal projection, and coprime factorization-critical steps in frequency domain design of precision control laws. Keywords: Computer programs; Mathematical models; Algorithms.