Surface Accuracy Analysis On The Influence Of Mesh Antenna Reflector With Thermal Effect On The Space

With the development of space technology, demand of the antenna is growing, and the surface flatness is an important structural indicator which is influential on the electric performance and application. However, thermal deformation caused by high and low temperature alternating is the most important factor that impacts on the surface precision of the antenna. Thermal deformation characteristics and surface flatness evolution of the inflatable hybrid mesh reflector on orbit were studied in this paper by using finite element method.This paper analyzed the purpose and significance of thermal analysis of antenna, as well as the research status at home and abroad. Then combined with the mesh antenna reflector, the characteristics of the space environment and space heat transfer mode of the antenna were analyzed when working on orbit, the finite element equations of the antenna temperature field analysis were established, and the temperature field and deformation field analysis process of inflatable deployable antenna by the thermal analysis software was described.The finite element model of the mesh reflector antenna was established. The thermal analysis method was established for the research object of this paper. When the sun is located at the spring equinox, the summer solstice, the autumnal equinox and the winter solstice, the temperature field, deformation field and surface flatness of the mesh antenna reflector surface on the earth synchronous orbit were analyzed using a finite element thermal analysis software. Then the influence law of the surface accuracy was obtained as a result the space thermal effect. According to the side lighting position, which has the large deformation and large surface precision, the solution was put forward.This paper studied the material aging problem of the main components structural on the reflector, hanging line, rib and the inflatable ring. Then considering the study results into the simulation analysis, the influence on the thermal deformation and surface flatness was analyzed, caused by the material aging of the main components structural on the reflector. The surface flatness evolution rules of the reflector on orbit were obtained. Surface flatness changes caused by material aging only occur at the outer edge of the reflection surface, and other regional deformation is very small and the precision change caused by material aging can be neglected.