Optimal Reconfiguration of Thermally Distorted Wire Mesh Reflectors for Large Space Antennas
Janiszewski, Alan Michael
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https://hdl.handle.net/2142/70635
Description
Title
Optimal Reconfiguration of Thermally Distorted Wire Mesh Reflectors for Large Space Antennas
Author(s)
Janiszewski, Alan Michael
Issue Date
1987
Doctoral Committee Chair(s)
Kuznetsov, E.N.,
Department of Study
Aeronautical and Astronautical Engineering
Discipline
Aeronautical and Astronautical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Aerospace
Abstract
The problem of guaranteeing reflector surface precision for large aperture antennas deployed in space has not been completely resolved. This feasibility study advances an approach that represents a fundamental divergence from conventional techniques. Specifically, an underconstrained structural system in the form of a wire mesh Chebyshev net is shaped to the desired reflector geometry. Predicted thermal patterns are applied to this surface and resulting distortions are calculated. A technique for optimally reconfiguring the distorted mesh in terms of RMS surface error is established. This reconfiguration is accomplished using the kinematic mobility inherent to underconstrained systems. Since stretching of the distorted mesh material is not allowed, control load magnitudes can be greatly reduced. An example using electrostatic control force is forwarded. The performance (in the form of antenna gain) for the resulting non-ideal surfaces is examined and is shown to be promising in terms of proposed space technology.
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