Translator Disclaimer
Paper
1 July 1990 Mechanical structure of JNLT: analysis of mirror deflection due to wind loading
Author Affiliations +
Abstract
The Japanese National Large Telescope (JNLT) will use a thin meniscus mirror of 7.5 m diameter and 0.2 m thickness as a primary mirror. One of the biggest concerns is mirror deflection due to dome-inside wind loading, which varies with time not only in its pressure amplitude but also in its pressure profile on the mirror surface. To analyze such mirror deflection, a method combining modal analysis and random vibration analysis was introduced. From the rms mirror deflection obtained by this method, the image quality degradation is considered to be better than that budgeted as wind loading degradation. Information about the method and typical result of the analysis are presented.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Noboru Itoh, Izumi Mikami, Takeshi Noguchi, Yasuhiro Shimizu, Yasumasa Yamashita, Jerry Sovka, Robert A. McLaren, and D. Andre Erasmus "Mechanical structure of JNLT: analysis of mirror deflection due to wind loading", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19257
PROCEEDINGS
12 PAGES


SHARE
Advertisement
Advertisement
RELATED CONTENT

Dome venting the path to thermal balance and superior...
Proceedings of SPIE (August 06 2014)
Many segments and few dollars: SALT solutions for ELTs?
Proceedings of SPIE (July 07 2004)
Wind buffeting effects on the Gemini 8-m primary mirrors
Proceedings of SPIE (November 05 2001)
Pancake ELT a practical design for an Extremely Large...
Proceedings of SPIE (August 04 2010)
Site testing telescope on Mt. Hopkins
Proceedings of SPIE (July 01 1990)
Low turbulence--high performance
Proceedings of SPIE (July 01 1990)

Back to Top