Distributed H∞ Control of Segmented Telescope Mirrors

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dc.contributor.author Ulutas, Baris
dc.date.accessioned 2014-08-12T22:38:23Z
dc.date.available 2014-08-12T22:38:23Z
dc.date.copyright 2014 en_US
dc.date.issued 2014-08-12
dc.identifier.uri http://hdl.handle.net/1828/5550
dc.description.abstract Segmented mirrors are to be used in the next generation of the ground-based optical telescopes to increase the size of the primary mirrors. A larger primary mirror enables the collection of more light, which results in higher image resolutions. The main reason behind the choice of segmented mirrors over monolithic mirrors is to reduce manufacturing, transportation, and maintenance costs of the overall system. However, segmented mirrors bring new challenges to the telescope design and control problem. The large number of inputs and outputs make the computations for centralized control schemes intractable. Centralized controllers also result in systems that are vulnerable to a complete system failure due to a malfunction of the controller. Distributed control is a viable alternative that requires the use of a network of simple individual segment controllers that can address two levels of coupling among segments and achieve the same performance objectives. Since segments share a common support structure, there exists a coupling among segments at the dynamics level. Any control action in one segment may excite the natural modes of the support structure and disturb other segments through this common support. In addition, the objective of maintaining a smooth mirror surface requires minimization of the relative displacements among neighbouring segment edges. This creates another level of coupling generally referred to as the objective coupling. This dissertation investigates the distributed H∞ control of the segmented next generation telescope primary mirrors in the presence of wind disturbances. Three distributed H∞ control techniques are proposed and tested on three segmented primary mirror models: the dynamically uncoupled model, the dynamically coupled model and the finite element model of Thirty Meter Telescope (TMT) project. It is shown that the distributed H∞ controllers are able to satisfy the stringent imaging performance requirements. en_US
dc.language English eng
dc.language.iso en en_US
dc.subject robust control en_US
dc.subject H∞ control en_US
dc.subject distributed control en_US
dc.subject segmented mirror en_US
dc.subject next generation telescope en_US
dc.subject active optics en_US
dc.title Distributed H∞ Control of Segmented Telescope Mirrors en_US
dc.type Thesis en_US
dc.contributor.supervisor Suleman, Afzal
dc.contributor.supervisor Park, Edward Jung Wook
dc.degree.department Department of Mechanical Engineering en_US
dc.degree.level Doctor of Philosophy Ph.D. en_US
dc.rights.temp Available to the World Wide Web en_US
dc.identifier.bibliographicCitation B. Ulutas, E.J. Park, A. Suleman, Distributed and centralized H∞ control of large segmented telescopes, Proceedings of ASME International Mechanical Engineering Congress and Exposition, Vancouver, BC, (2010) 1129-1137. en_US
dc.identifier.bibliographicCitation B. Ulutas, E.J. Park, A. Suleman, Decomposition-based distributed H∞ control of large segmented telescopes, Proceedings of CSME International Congress, Toronto, ON, (2014). en_US
dc.identifier.bibliographicCitation B. Ulutas, D. Kerley, J. Dunn, A. Suleman, E.J. Park, Distributed H∞ control of dynamically coupled segmented telescope mirrors: Design and simulation, Mechatronics, 22(1) (2012) 121-135. en_US
dc.identifier.bibliographicCitation B. Ulutas, E.J. Park, A. Suleman, LMI-based Distributed H∞ control of dynamically coupled large segmented telescope mirrors, Proceedings of IEEE/ASME International Conference on Advanced Intelligent Mechatronics, Besancon, France, (2014). en_US
dc.description.scholarlevel Graduate en_US
dc.description.proquestcode 0548 en_US

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