The Influence Factor Analysis of Thermal Stability for the Space-borne Antenna

Spaceborne antenna recent years, the birth of a new type of folding structure . The spaceborne antenna along the orbital flight , it is necessary to periodically and out of Earth's shadow , coupled with the antenna structure itself (such as reflective mesh , rods , etc. ), shade affected , tend to experience more substantial changes in the high and low temperature a large temperature gradient exists in the structure , such abrupt high - temperature change and non-uniform temperature distribution in the structure will cause the thermal expansion and thermal stress, thermal deformation of the antenna structure ; Therefore, in order to ensure its higher thermal stability , it is very necessary factor analysis of the heat-affected in the space environment . This paper describes the the spaceborne antenna in rail thermal analysis theory and the theoretical analysis of the the spaceborne antenna in orbit thermal stability ; onboard parabolic antenna heat calculation model with the I-DEAS software to analyze the impact spaceborne parabolic antenna in rail thermal stability factors ; refinement Earth shaded area indicates the spaceborne antenna in and out of the shadow zone temperature mutation , spaceborne parabolic antenna temperature change rate of the different physical parameters were calculated using the rate of temperature change ; analysis the influence of the temperature gradient on the antenna thermal stability , with a mean deviation to represent the spaceborne antenna degree of uniformity of temperature distribution in the rail arbitrary timing , combined with the rMS error of the deformation of the various moments , the final analysis of the derived impact star set parabolic antenna in orbit thermal stability criterion ; take full account of the cellular material of orthogonal each items heterosexual different equivalent spaceborne parabolic antenna in orbit temperature field .