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Finite element analysis of TMT vibrations transmitted through Telescope-Enclosure-Soil Interaction

Shagal, Genady and MacMynowski, Doug G. and Vogiatzis, Konstantinos (2008) Finite element analysis of TMT vibrations transmitted through Telescope-Enclosure-Soil Interaction. In: Modeling, Systems Engineering, and Project Management for Astronomy III. Proceedings of SPIE. No.7017. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 70171Y. ISBN 9780819472274. http://resolver.caltech.edu/CaltechAUTHORS:20190516-135116040

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Abstract

Telescope-Enclosure-Soil Interaction could result in additional telescope movement due to two main sources: (i) enclosure windshake and (ii) vibrations of machinery located at enclosure, summit and utility facilities. To analyze and minimize these vibrations, a novel FE model was developed based on existing FE models for the TMT enclosure and telescope structures. This integrated structural model adequately represents propagation of vibrations from the source to the telescope structure through surrounding soil/rock region. The model employs 3-D linear-elastic harmonic analysis using commercial FE code ANSYS. Special attention was devoted to adequate modeling of reflecting and non-reflecting boundary conditions. Based on the FE model developed, we examined the effects of soil/rock stiffness and damping upon telescope vibrations and, ultimately, seeing quality. The effects of location, intensity and spectral content of main sources of machinery vibrations were also investigated.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.792288DOIArticle
ORCID:
AuthorORCID
MacMynowski, Doug G.0000-0003-1987-9417
Additional Information:© 2008 Society of Photo-Optical Instrumentation Engineers (SPIE). The TMT Project gratefully acknowledges the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the California Institute of Technology and the University of California. This work was supported as well by the Gordon and Betty Moore Foundation, the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the National Research Council of Canada, the Natural Sciences and Engineering Research Council of Canada, the British Columbia Knowledge Development Fund, the Association of Universities for Research in Astronomy (AURA) and the U.S. National Science Foundation.
Group:Thirty Meter Telescope
Funders:
Funding AgencyGrant Number
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
CaltechUNSPECIFIED
University of CaliforniaUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
British Columbia Knowledge Development FundUNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
NSFUNSPECIFIED
Subject Keywords:Thirty Meter Telescope (TMT), finite element analysis, vibration propagation
Record Number:CaltechAUTHORS:20190516-135116040
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20190516-135116040
Official Citation:Genady Shagal, Doug G. MacMynowski, and Konstantinos Vogiatzis "Finite element analysis of TMT vibrations transmitted through Telescope-Enclosure-Soil Interaction", Proc. SPIE 7017, Modeling, Systems Engineering, and Project Management for Astronomy III, 70171Y (11 July 2008); doi: 10.1117/12.792288; https://doi.org/10.1117/12.792288
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95546
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 May 2019 22:04
Last Modified:16 May 2019 22:04

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