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Thursday, February 13, 2020 | History

3 edition of Reliability issues in active control of large flexible space structures found in the catalog.

Reliability issues in active control of large flexible space structures

Reliability issues in active control of large flexible space structures

semi-annual status report for the period May 16, 1984 to November 15, 1984

by

  • 137 Want to read
  • 8 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Large space structures (Astronautics)

  • Edition Notes

    Statementprincipal investigator: Prof. W.E. Vander Velde.
    SeriesNASA contractor report -- NASA CR-179785.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15377960M

    Dynamic models of LFSS are characterized by their high order and their significant number of highly uncertain, lightly-damped, clustered low-frequency modes. HDMI 2. Consequently, active control must be restricted to a few critical modes. Now, it makes no sense that an ultra-premium notebook released in late only supports HDCP 1.

    Assumptions and abstractions must be made to simplify the problem. The operatorA is a time-invariant symmetric differential operator with a discrete, semibounded spectrum. I love its battery life and its keyboard, and tearing off the tablet to flick through RSS feeds and watch video feels like the future. This merit results in avoiding the amplification of the measurement noise.

    Complete testing of a moderately complex software module is infeasible. The main contribution of this study is that the proposed method guarantees the global uniform ultimate boundedness of the output tracking error using only output feedback for unknown non-linear systems with external disturbance. Applied Mechanics, Vol. The direction of dimensional change is independent of electric field polarity.


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Reliability issues in active control of large flexible space structures book

Pinson, A. Higher reliability can be achieved by using better development process, risk management process, configuration management process, etc.

Costs increase when developers use inadequate processes. Keviar fiber, on the other hand, has high specific tensile strength and stiffness and is useful where electrical or dielectric properties are of concern. Access options Instant access to the full article PDF.

The robust high order augmented observer RHOAOB is developed to estimate the lumped augmented state variables and full state. However, this emphasis on low weight may be tempered in some small spacecraft applications that involve demands for low cost, easy adaptability, and growth capability.

Until now, we still have no good way of measuring software reliability. Ground-test proof of successful deployment in space is essential. The plant uncertainty is described as stable perturbations of the coprime factors. This book is intended for structural engineers who want to acquire some background in vibration control; it can be used as a textbook for a graduate course on vibration control or active structures.

Structural weight of spacecraft has historically been only about 20 percent of the total dry weight.

Modeling and control of large flexible structures

But the current knowledge base for the production of, and design with, composite materials polymer-matrix composites in particular has to be not only thoroughly absorbed but may have to be substantially enhancer! Spacecraft Structures and Materials Aluminum-Lithium Alloys A weight-saving alternative to the use of conventional aluminum alloys in spacecraft design could be the use of aluminum-lithium alloys.

Research should be generic in character as well as focused on specific needs for small spacecraft. However, although substitution of aluminum-lithium alloys for conventional alloys can essentially be achieved with no redesign, and several alloys are becoming "flight tested" as commercial aircraft components, care must be exercised with the use of forgings of certain aluminum-lithium alloys due to their low through-thickness short-transverse toughness.

The fact it makes zero sense just adds insult to injury. If not considered carefully, software reliability can be the reliability bottleneck of the whole system. Sesak, P. Until now there is no good way to conquer the complexity problem of software.

Meirovitch and H.

Looking for other ways to read this?

Lin, Scientific American, vol. Google Scholar [8] L.Control of flexible structures with spillover using an augmented observer Article (PDF Available) in Journal of Guidance Control and Dynamics 12(2) · March with 64 Reads.

The fundamental and challenging issues in the control of large space structures are those which arise from the flexible characteristics of the structure or the distributed nature of the systems's energy Modeling errors are inevitable due to the complexity of large space structures and the necessary model simplifications of the distributed Cited by: 7.

Software reliability is a key part in software quality. The study of software reliability can be categorized into three parts: modeling, measurement and improvement. Software reliability modeling has matured to the point that meaningful results can be obtained by applying suitable models to the problem.

Progress in robust failure detection and isolation, control system reconfiguration, and performance evaluation of systems having redundancy management features is briefly summarized. Active Control of Plate-Like Structures for Vibration and Sound Suppression and validation of a robust controller is presented by Iorga et al.

[9]. In their paper, structural modeling techniques with uncertainty analysis are explained and H∞ controller design is pursued by placing emphasis on robust control concepts. This book is intended for structural engineers who want to acquire some background in vibration control; it can be used as a textbook for a graduate course on vibration control or active structures.

A solutions manual is available through the publisher to teachers using this book as a textbook.