Computer Science – Performance
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.555e.128h&link_type=abstract
Proceedings of the 4th International Spacecraft Propulsion Conference (ESA SP-555). 2-9 June, 2004, Chia Laguna (Cagliari), Sard
Computer Science
Performance
Scientific paper
The possibility of measuring the three force components i.e. the main axial component and the two orthogonal radial components, generated by an electric propulsion system is important for two reasons. Firstly, to assess the impact of spacecraft/propulsion system integration issues, for example to verify the alignment of the thrust vector with the spacecraft centre-of-mass for spacecraft stability. Secondly, to operate the thruster properly during flight, for example to determine the thrust vector relative to the mechanical axis of the thruster. Furthermore, a three-axis measurement capability will be useful for the experimental performance verification of the next generation of vectored electric propulsion devices, especially regarding the many unresolved issues connected with indirect thrust measurement using electrostatic probes. The capability to monitor thrust vector drift in real time and with significant bandwidth is also important. Thus enabling vector drift during thruster warm-up, to be measured, and the response of vectored thrusters to change in vector demand can be assessed. In this paper we describe the design, construction and testing of an instrument proof of concept. The instrument was designed to accommodate a dummy thruster mass of 0.5 kg and operate in the 0 to 10 mN range. The directional resolution that has been demonstrated is better than 0.05 ° in both axes when operating at full thrust.
Hughes Bruce
Oldfield S.
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