Physics
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.530..197w&link_type=abstract
In: 16th ESA Symposium on European Rocket and Balloon Programmes and Related Research, 2 - 5 June 2003, Sankt Gallen, Switzerlan
Physics
Space Flight: Techniques, Instrumentation, Ranges
Scientific paper
A major hurdle in extending the range of experiments for which balloon vehicles are useful has been the imposition of the gondola dynamics on the accuracy with which an instrument can be kept pointed at a celestial target. In this paper, the foundation for a high fidelity controller simulation is presented and it is shown that sub-arcsecond pointing stability can be achieved for a large instrument pointing at an inertial target. The flexibility of the flight train is represented through generalized modal analysis. A multiple controller scheme is introduced with a coarse azimuth pointer and a pitch-yaw gimbal mount for fine pointing. An analysis and demonstration of the necessity in eliminating static friction are provided along with a solution to eliminate static friction from the system dynamics. A control scheme involving linear accelerometers for enhanced disturbance rejection is also presented. This paper establishes that the proposed control strategy can be made robustly stable with significant design margins. Also demonstrated is the efficacy of the proposed system in rejecting disturbances larger than those considered realistic.
Deweese Keith D.
Ward Philip R.
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