Passive Orbital Disconnect Strut
A prior study1 has shown that the weight of a three-year lifetime superfluid helium dewar is cut in half if passive orbital disconnect strut (PODS) supports are used in place of nondiscon-nect, state-of-the-art, fiberglass-tension-band supports. If the same tank sizes are used, the lifetime is tripled. This paper discusses the design concept and heat transfer tests with a cold boundary of 4 K and a warm boundary of up to 40 K for the disconnect mechanism. The results to date show that the support conductance is lower by a factor of greater than ten over equivalent nondisconnect supports and that the measured conductance is lower than the predicted conductance. This support concept can be scaled to any tank size, shape, weight, and acceleration loads and can be used in applications other than tank support where low thermal conductance is desired.
KeywordsHelium Epoxy Shrinkage Fiberglass FIBERGLAS
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- 1.R. T. Parmley, “Feasibility Study for Long Lifetime Helium Dewar,” NASA-CR166254 (Dec 1981).Google Scholar