rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Dynamics and control of tethered satellite systems
  name:
    name part: Kim, Euisok
    name part: 1961-
    role:
      role term: creator
  name:
    name part: Vadali, Srinivas R.
    role:
      role term: degree supervisor.
  name:
    name part: Huang, Garng M.
    role:
      role term: degree committee member.
  name:
    name part: Junkins, John L.
    role:
      role term: degree committee member.
  name:
    name part: Kurdila, Andrew J.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1993
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: ix, 121 leaves : illustrations ; 28 cm
  abstract: The purpose of this research is to investigate the dynamics of a tethered satellite system in which the flexibility of the tether is considered and to design control laws for the deployment and retrieval of the tethered subsatellite using a method based on the Lyapunov stability theory. The dynamics of the system considered is modelled with as little simplifications and assumptions as possible to keep the problem tractable and at the same time physically realistic. Effects of geometric nonlinearity is taken into account. The hybrid governing equations are discretized by using the Galerkin's method. The flexible tether is also modelled as a series of beads which are connected in series by massless springs. Several tension and reel rate feedback control laws for deployment and retrieval are designed using Lyapunov's method when flexibility of the tether is neglected. It was found that the tension control laws designed for the simplified system can have a stabilizing effect on the vibrations of the tether. The performance of the full dynamic system with the designed control laws is investigated via simulations using both the Galerkin and bead model. At the same time, observations regarding the dynamics of the system and the validity of using the Galerkin's discretization procedure for a variable length tether are investigated. It is shown that the effects of geometric nonlinearity is significant during retrieval and that when geometric nonlinearity is included, an artificial instability is introduced into the Galerkin model causing sudden divergence of the system response during retrieval. This behavior is reproduced even for a simplified two dimensional example problem. It was found that the bead model produces a response that is physically realistic. Simulation studies using the bead model show that when reel rate control laws are used, vibrations grow to the point where the system becomes unstable. However, the tension control laws successfully retrieve the tethered…
  note: Vita.
  note: "Major subject: Aerospace Engineering."
  note: Includes bibliographical references.
  note: Ph. D. Texas A & M University 1993
  subject:
    topic: Tethered satellites
  subject:
    topic: Space vehicles
    topic: Control systems
  subject:
    topic: Space vehicles
    topic: Dynamics
  subject:
    topic: Major aerospace engineering
  identifier: http://gateway.proquest.com/openurl
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://gateway.proquest.com/openurl
  record info:
    record content source: TXA
    record creation date: 950517
    record change date: 20200904152712.0
    record identifier: in00001229377
    language of cataloging:
      language term: eng