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Parametric modeling and control of telescope wind-induced vibration

MacMynowski, Douglas G. and Angeli, George Z. and Vogiatzis, Konstantinos and Fitzsimmons, Joeleff and Padin, Steve (2004) Parametric modeling and control of telescope wind-induced vibration. In: Modeling and Systems Engineering for Astronomy. Proceedings of SPIE. No.5497. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 266-277. ISBN 9780819454294. https://resolver.caltech.edu/CaltechAUTHORS:20190115-143136059

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Abstract

A parametric model of the dynamic performance of an optical telescope due to wind-buffeting is presented. The model is being developed to support the design of next generation segmented-mirror optical telescopes through enabling rapid design iterations and allowing a more thorough exploration of the design space. A realistic performance assessment requires parametric descriptions of the wind, the structural dynamics, active control of the structure, and the optical response. The current model and its assumptions are presented, with the primary emphasis being on the parameterization of the wind forces. Understanding the temporal spectrum and spatial distribution of wind disturbances inside the telescope enclosure is one of the most challenging aspects in developing the overall parametric model. This involves integrating information from wind tunnel tests, computational fluid dynamics, and measurements at existing observatories. The potential and limitations of control to mitigate the response are also discussed, with realistic constraints on the control bandwidth obtained from the detailed structural model of a particular point design. Finally, initial results are presented on performance trends with a few key parameter variations.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.552282DOIArticle
ORCID:
AuthorORCID
MacMynowski, Douglas G.0000-0003-1987-9417
Additional Information:© 2004 Society of Photo-optical Instrumentation Engineers (SPIE). This work was conducted as part of the Thirty Meter Telescope project. The Thirty Meter Telescope (TMT) Project is a partnership of the Association of Universities for Research in Astronomy (AURA), the Association of Canadian Universities for Research in Astronomy (ACURA), the California Institute of Technology and the University of California. The partners gratefully acknowledge the support of the Gordon and Betty Moore Foundation, the US National Science Foundation, the National Research Council of Canada, the Natural Sciences and Engineering Research Council of Canada, and the Gemini Partnership. The comments of Jerry Nelson at UCSC have been extremely valuable in this effort. Tait Pottebaum at Caltech provided insight into the measured flow patterns.
Group:Thirty Meter Telescope
Funders:
Funding AgencyGrant Number
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
CaltechUNSPECIFIED
University of CaliforniaUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
NSFUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Gemini PartnershipUNSPECIFIED
Subject Keywords:Parametric modeling, extremely large telescope, control, wind-buffeting
Series Name:Proceedings of SPIE
Issue or Number:5497
Record Number:CaltechAUTHORS:20190115-143136059
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190115-143136059
Official Citation:Douglas G. MacMynowski, George Z. Angeli, Konstantinos Vogiatzis, Joeleff Fitzsimmons, Stephen Padin, "Parametric modeling and control of telescope wind-induced vibration," Proc. SPIE 5497, Modeling and Systems Engineering for Astronomy, (16 September 2004); doi: 10.1117/12.552282
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92293
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Jan 2019 23:04
Last Modified:03 Oct 2019 20:43

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