Parametric study of sensitivity of deployed frequency for large cable net antenna

Abstract

Large light-weight deployable cable net reflectors are widely used in communication satellites. These are much larger than satellite and need stowing into a relatively small volume to fit into launch vehicle and are deployed in orbit. The cable net reflectors use deployable support structure along with pretensioned cable net. Due to its large dimensions, the deployed natural frequency will be quite low and may not be acceptable from controls point of view. In such cases, the deployed frequency needs to be enhanced to ensure that the same meets the minimum requirements. This article presents a study of the different parameters, which have been varied in order to assess the sensitivity of the same with respect to the deployed frequency. The effect of the flexibility of each sub-assembly has been assumed and this has helped to identify the sub-assembly, which has to be stiffened in order to enhance the overall frequency. Also, the results from this study have provided the design inputs for modifications to be carried out in order to realize a large cable net antenna.

Thermal–structural analysis of large deployable space antenna under extreme heat loads

“…New structural conceptual designs, such as double-ring truss and folded xed truss and which may present higher sti ness, were mechanically designed and analyzed [10][11][12][13][14]. Further, prestress optimizations and form-nding methods were put forward to enhance the surface accuracy and structural reliability of the antennas [15][16][17][18][19]. Electronic compensation strategies that may enhance the antenna's structural stability are identi ed [20].…”

Autonomous Pointing Control of a Large Satellite Antenna Subject to Parametric Uncertainty

“…These applications generally require large, satellite-borne antennas. Due to the restrictions of the fairing of launch vehicles, the paradigm of large satellite antennas (LSAs) is being gradually implemented in both commercial and scientific missions such as Thuraya and National Reconnaissance Office Launch 26 (NROL-26) [4,5,6,7]. Since the antenna signal is weak during satellite on-orbit operations, the optical axis of the antenna should be continuously directed towards the target.…”