Thermal implications from the Hubble Space Telescope solar array bi-stem boom in-orbit disturbance

Details Thermal implications from the Hubble Space Telescope solar array bi-stem boom in-orbit disturbance Thermal implications from the Hubble Space Telescope solar array bi-stem boom in-orbit disturbance

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991esse.conf..961p&link_type=abstract

In its 4th European Symposium on Space Environmental Control Systems, Volume 2 p 961-967 (SEE N92-26950 17-54)

Mathematics

Heat Shielding, Hubble Space Telescope, Mathematical Models, Solar Arrays, Temperature Control, Temperature Effects, Thermal Analysis, Transient Response, Disturbances, Heat Transfer Coefficients, Penumbras, Temperature Gradients

Scientific paper

The Hubble Space Telescope, launched on Apr. 24 1990, has two solar array wings. After the deployment of the arrays in orbit, attitude control disturbances were apparent, affecting the telescope, and which are believed to be due to the solar arrays. The main disturbances occur at two significant periods, namely the night/day and day/night transitions. As part of an investigative program to understand the phenomena, an especially detailed mechanical/thermal analysis was performed in the array bi-stems. An ESATAN (ESA Thermal Analysis Network) thermal mathematical model was created and the emphasis was on the transient thermal response at the penumbra passage. In particular, this shows the rate of change of the temperature gradients and their possible significance in relation to the transition periods. The thermal analysis was then extended to support the solution suggested by the previous work and considered to reduce/alleviate the problem. This solution could be implemented on the second pair of solar arrays, already in manufacture for the planned in orbit replacement. The effects of introducing a thermal shield in the form of a bellows is presented and the consequential improvement discussed.

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