Study of the Influence of Dynamic Characteristics of a Large Space Antenna on Its Reflecting Properties

摘要

A mechanical system consisting of a spacecraft with a mirror is considered. The mirror is fixed to the apparatus by three bearings. The mirror is a composite two-layer rod system with an almost periodic structure covered by a wire-grid. The rod system of the antenna is replaced by a continuous shell. As a result, oscillation frequencies and oscillation forms of the considered mechanical system are calculated efficiently by the finite element method. The results obtained are used by a program that calculates a direction diagram of a dispersed field under deformations of the antenna mirror. The influence of mechanical oscillations of the system generated by rotations of a spacecraft on reflecting properties of the antenna are studied.