Stability And Optimization Of Flexible Space Structures
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Stability And Optimization Of Flexible Space Structures
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Author : S.J. Britvec
language : en
Publisher: Birkhäuser
Release Date : 2012-12-06
Stability And Optimization Of Flexible Space Structures written by S.J. Britvec and has been published by Birkhäuser this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
The aim of this book is to present up-to-date methodologies in the analysis and optimization of the elastic stability of lightweight statically determinate, and in- determinate, space structures made of flexible members which are highly stiff when loaded centrally at the nodes. These are flat and curved space pin- connected open or enveloped lattices and reticulated shells which, due to their high loadbearing capacity to weight ratios, are gaining in importance in aerospace and other fields. They are utilized, for example, in space stations, as support structures for large radio-telescopes and for other equipment on earth and in outer space, as roof structures for the coverage and enclosure of large areas on earth and as underwater shell-type structures enveloped by a cover-shell capable of withstanding high hydrostatic pressures. • Space structures of this type are generally subjected to considerable internal axial loads in the flexible members and they fail through the loss of global statical stability, usually precipitated by the intrinsic small imperfections at finite near-critical elastic deformations - and not primarily by the the break-down of the material of which they are made, as is the case in conventional systems. Thus, the criterion in the design of such structures calls for eliminating or isolating the onset of the elastic dynamic collapse thereby increasing their safe stability limit. • Standard finite element methods, as they are employed by most users today, are totally inadequate for such analyses since they do not account for the choice of the branching paths in the loading process of the structure nor for the existence of the relevant collapse modes. • These aspects are novel and they are presented here for the first time in comprehensive book form.
Stability And Optimization Of Flexible Space Structures
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Author : Stanislaus J. Britvec
language : en
Publisher:
Release Date : 1995
Stability And Optimization Of Flexible Space Structures written by Stanislaus J. Britvec and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
An Optimization Based Integrated Controls Structures Design Methodology For Flexible Space Structures
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Author : Peiman G. Maghami
language : en
Publisher:
Release Date : 1993
An Optimization Based Integrated Controls Structures Design Methodology For Flexible Space Structures written by Peiman G. Maghami and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
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.
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.
Technology For Large Space Systems
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Author :
language : en
Publisher:
Release Date : 1982
Technology For Large Space Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Large space structures (Astronautics) categories.
Structural Construction Conf
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Author : Franco Bontempi
language : en
Publisher: CRC Press
Release Date : 2003-01-01
Structural Construction Conf written by Franco Bontempi and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-01-01 with Architecture categories.
Objective of conference is to define knowledge and technologies needed to design and develop project processes and to produce high-quality, competitive, environment- and consumer-friendly structures and constructed facilities. This goal is clearly related to the development and (re)-use of quality materials, to excellence in construction management and to reliable measurement and testing methods.
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...
Space Station Systems
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Author :
language : en
Publisher:
Release Date : 1989
Space Station Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Space stations categories.
Design Methods Of Control Systems
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Author : D. Franke
language : en
Publisher: Elsevier
Release Date : 2014-05-23
Design Methods Of Control Systems written by D. Franke and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-05-23 with Technology & Engineering categories.
These Proceedings contain a selection of papers presented at the first IFAC Symposium on Design Methods of Control Systems. The volume contains three plenary papers and 97 technical papers, the latter classified under 15 section headings, as listed in the contents.