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- W2022186346 abstract "Abstract The orbital cryogenic lifetime of Dewars can be significantly increased if the supports which fix the cryogen tank to the Dewar vacuum vessel are disconnected on orbit under 0 g conditions. In a study performed under an Estec contract, 16 different concepts of purely passive and of active cryogen tank supports were assessed. Based on the outcome of this assessment a ‘semi-active’ disconnect concept was selected which makes use of the change of length of a ‘shape memory alloy’ (SMA) support element which is located at the warm end of a conventional strap-type cryogen tank support. This SMA element is at its extended length at room and lower temperatures and its length is designed such that the strap tank suspension has no pretension or even any contact to the tank support strap at room and lower temperatures. Upon heating the SMA element electrically to ∼85°C, it contracts such that the tank support straps come into contact with the SMA element and are pretensioned by its contraction. In a conventional strap tank support with lower and upper straps the upper straps are equipped with SMA elements. These elements are not in contact with the straps on the ground. For structural tests on the ground, and for launch and landing (of a reusable Dewar) the SMA elements are activated/heated. During all other periods on the ground and when on orbit the SMA elements are not activated. Hence on the ground heat transfer via conduction from the cryogen tank straps occurs via the lower straps only. On orbit the SMA elements are in their extended length mode, such that all the suspension straps are out of contact, resulting in negligible heat transfer via conduction due to unavoidable rest contacts under practically zero load." @default.
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- W2022186346 date "1994-05-01" @default.
- W2022186346 modified "2023-09-27" @default.
- W2022186346 title "Novel orbital disconnect support for cryogenic tanks" @default.
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- W2022186346 doi "https://doi.org/10.1016/0011-2275(94)90125-2" @default.
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