A Method to Confirm Stiffness Requirements of a Large Deployable Satellite Antenna

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  • 3308 衛星搭載用大形展開アンテナの剛性要求の確認方法

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Abstract

This paper describes a method to confirm stiffness requirements of deployable satellite antennas in the deployed configuration. Deployable satellite antennas are modeled as a reflector (an elastic body) supported by a mechanism or support structure (a coil spring). The equation of motion is obtained assuming that the displacement of the antenna is expressed as the sum of the elastic displacement and the rigid-body displacement due to spring rotation. Reflector modes, selected by using a parameter that is calculated using elastic and rigid-body modes of the reflector, are considered in antenna frequency prediction. A procedure is presented to confirm that the deployable antennas meet the frequency requirements. Numerical examples show that the modal test of the reflectors is not necessarily effective to confirm the frequency requirement.

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