Statistics – Applications
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.540...81p&link_type=abstract
In: Proceedings of the 9th International Symposium on Materials in a Space Environment, 16-20 June 2003, Noordwijk, The Netherla
Statistics
Applications
Space Environment, Materials
Scientific paper
The Electrostatic Gravity Gradiometer (EGG) is the main payload of the Gravity field and steady state Ocean Circulation Explorer (GOCE) mission, which has the objectives of producing models of the Earth's gravity field and geoid with high resolution and accuracy. The EGG allows measuring the components of the gravity gradient tensor by means of a set of accelerometers. To meet the outstanding measurement requirements, the EGG structure must provide high dimensional stability under the expected environmental conditions. Carbon-Carbon technology has been selected for the construction of the sandwich panels, which support the accelerometers and their electronics, as well as the thermal control unit. This technology in fact offers good thermo-elastic characteristics, low sensitivity to moisture (only for organic assembly), high panel stiffness-to-mass ratio. Due to the lack of heritage for large-size sandwich structures, a dedicated evaluation and qualification program has been established for the demonstration of the suitability of the sandwich and associated manufacturing processes to the GOCE applications. Following the evaluation of candidate materials and associated bonding techniques, a preferred baseline has been selected that is undergoing qualification testing. A safe two-steps manufacturing process of the sandwich panels has been adopted: C/C face-sheets and honeycomb cores are procured from Hitco Carbon Composites Inc, USA, and their assembly is performed by Alcatel Space through organic bonding, to obtain the final sandwich structure. The results of the evaluation and of the first qualification tests are presented in the paper.
Lemaire Hugues
Lutz-Nivet Martine
Panin Fabio
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