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Title:
Replacement of the Green Bank Telescope azimuth track
Authors:
Anderson, Robert; Symmes, Arthur; Egan, Dennis
Affiliation:
AA(National Radio Astronomy Observatory (United States)), AB(National Radio Astronomy Observatory (United States)), AC(National Radio Astronomy Observatory (United States))
Publication:
Ground-based and Airborne Telescopes II. Edited by Stepp, Larry M.; Gilmozzi, Roberto. Proceedings of the SPIE, Volume 7012, pp. 701237-701237-12 (2008). (SPIE Homepage)
Publication Date:
08/2008
Origin:
SPIE
DOI:
10.1117/12.784807
Bibliographic Code:
2008SPIE.7012E.110A

Abstract

The azimuth track of the Green Bank Telescope did not perform as designed. Relative movement of components was noted during construction; in addition, fretting of the base plate and wear plate faying surfaces, fatigue cracking of the wear plates, fatigue failure of wear plate fasteners, and deterioration of the cementitous grout layer occurred at a rapid pace during the first few years of operation. After extensive failure analysis, a new system of components was designed and fabricated, and installation of the components was performed during 2007 (Symmes, Anderson, and Egan, "Improving the service life of the 100m Green Bank Telescope azimuth track", SPIE 7012-121). The highlights and lessons learned during the fabrication and installation phases are described herein. This information will benefit any organization performing a similar replacement, and may be helpful in new installations as well.
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