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23 January 2003 Weight optimization of a very large dewar for flight applications
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Abstract
The design optimization of a dewar with a very large cold stage, for flight applications, is described. The optimization was achieved with the aid of Cosmos/m Finite Elements software, in order to arrive at a dewar of minimum weight. The design concept incorporate a symmetrical base, which includes cavities and ribs. The number and dimensions of the frame ribs were varied in order to arrive at weight optimization consistent with maintaining the cold stage natural frequency and deflections within the required limits. The final result of this weight optimization process was a dewar with a 25% weight reduction as compared with a more conventional dewar wiht a solid base. The weight of the new dewar, the natural frequencies and center of mass location were 522gm, 1095Hz, 1435Hz, 2022Hz, 3239Hz 0, 17.4mm, 0, respectively. The weight of the traditional dewar, the natural frequencies and center of mass location were 709gm, 1080Hz, 1411Hz, 2111Hz, 3230Hz, 0,15.0mm, 0, repsectively.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dani Har-Even, Andrei Baruch, Amos Sonn, Eli Meroz, Ilan Porat, and Jacob Haski "Weight optimization of a very large dewar for flight applications", Proc. SPIE 4820, Infrared Technology and Applications XXVIII, (23 January 2003); https://doi.org/10.1117/12.453578
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