Mechanical structure of JNLT - Analysis of mirror deflection due to wind loading

Details Mechanical structure of JNLT - Analysis of mirror deflection due to wind loading Mechanical structure of JNLT - Analysis of mirror deflection due to wind loading

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236..866i&link_type=abstract

IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 2 (A91-23201 08-89

Physics

Deflection, Mirrors, Structural Analysis, Telescopes, Wind Effects, Dynamic Response, Japan, Loads (Forces), Modal Response, Power Spectra, Pressure Distribution, Structural Vibration

Scientific paper

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.

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