Statistics – Applications
Scientific paper
Jan 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..654..571c&link_type=abstract
SPACE TECHNOLOGY AND APPLICATIONS INT.FORUM-STAIF 2003: Conf.on Thermophysics in Microgravity; Commercial/Civil Next Generation
Statistics
Applications
Spaceborne And Space Research Instruments, Apparatus, And Components
Scientific paper
This paper discusses a programme of research based on the incremental invention of the so-called Motorised Momentum Exchange Tether (MMET) for space vehicle propulsion, and summarises aspects of the predicted performance of hanging, librating, and spinning symmetrical momentum exchange tethers in a circular orbit around the Earth. A preliminary case for double-payloaded, symmetrical tethers is also made. This shows that the MMET concept has certain predicted performance advantages over a passive momentum exchange tether. From that stand-point an ESA funded programme of terrestrial scale-model experimentation is discussed. This programme was intended to prove certain practicalities of the motorised concept within a suitably scaled model. To that end a dynamic scaling methodology based on aspects of the Buckingham Pi-theorem was evolved and appropriate dynamic scaling criteria were obtained for both rigid body spin-up and flexural vibrations within the system. The paper outlines the practical design of the scale model which resulted from this work, the running of a set of two-dimensional experimental tests on a large expanse of ice, and the resulting interpretation of results of the tests. The discussion concludes with an overview of new work on initial proposals for de-spin of the payloads after release, and issues relating to post-release de-spin of the centralised motor drive facility.
Cartmell Matthew P.
Neill David S.
Ziegler Spencer W.
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