Statistics – Computation
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..628..526r&link_type=abstract
IN: Advanced technology optical telescopes III; Proceedings of the Meeting, Tucson, AZ, Mar. 3-6, 1986 (A87-35201 15-89). Bellin
Statistics
Computation
1
Borosilicate Glass, Design Analysis, Finite Element Method, Mirrors, Nastran, Reflecting Telescopes, Computational Grids, Computer Aided Design, Computer Programs
Scientific paper
In examining the local flexure of large, rib structure-stiffened borosilicate glass primary mirrors for telescopes, FEMs employing fine meshes for accurate model representation have yielded useful results concerning such mirrors' unique problems. A number of the proposed mirror support methods are noted to exhibit an unexpected and troublesome amount of deflection near the outer edge during self-weight loading. The iterative application of finite element analyses is presently combined with a small amount of rib redesign at each iteration to yield improved flexure characteristics. The flexure of individual ribs near the mirror's edge suggests that a more direct loading of the outermost support points should be striven for; more material would then be placed in direct compression. A casting should be sufficiently oversized to obviate edge flexure problems.
Chang Jen-Hsu
Ray Frank B.
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