Computer Science
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.524..289d&link_type=abstract
In: Proceedings of the 10th European Space Mechanisms and Tribology Symposium, 24-26 September 2003, San Sebastián, Spain. Compi
Computer Science
Actuators, Rosetta
Scientific paper
More than one hundred trimetal actuators and three hundred bearings will allow the blades movement in the 14 louvres fitted over the radiators of the ROSETTA S/C. Near the Sun, the blades shall be open to allow the radiators to dissipate heat into space. During the prolonged periods of hibernation and comet rendezvous, the blades shall be close in order to retain as much heat as possible in the spacecraft. SENER design of the Rosetta Platform Louvres consists of a framed array (397×430 mm) of highly specular reflecting blades which are individually pivoted to temperature-sensitive actuators. The novel actuators are trimetallic (traditionally were bimetallic) coil springs enclosed within a housing that is well isolated from the external environment but which maintains good thermal contact with the mounting panel requiring thermal control. The actuators are "calibrated" to cause the associated blades to be fully open and fully closed at prescribed temperatures. As the temperature of the panel begins to increase, the related rise in the actuators temperature creates a thermal moment which forces the louvres blades to open and hence lead to an increase in the radioactive power to space. Similarly, as the panel temperature decreases, the actuators tend to close the blades, which now offer a high resistance to radiation losses.
Domingo Miguel
Ramírez José Julián
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