Study On Thermal Design Of Solar Observer At L1Lagrangian Point In Sun-earth System

In order to carry out the exploration of space weather, solar observation plan isproposed. The Solar observer is the first Chinese spacecraft to be launched to haloorbit at L1Lagrangian point in Sun-Earth system. The camera is a deep spaceexploration mission, and equipped with a coronagraph and an imager. Long-termobservations of the solar is a great challenge for thermal design.1. Study the thermal design of the same type of product abroad, and get thethermal design features of this observer;2. Introduced the structural characteristics of the camera, Analysis the thermalenvironment of the orbital, and calculate the heat flux density of this orbit;3. The thermal design of light trap, filter components, detector components,electric box, and entirety of the observer were dissertated in details. Because ofcollector panels settled in the side facing to the Sun, the active heating power isreduced by73%. In order to reduce the temperature gradient caused by long-termobservation, embedding heat pipe in the frame is chosen. Simulation results showthat all conditions meet the temperature indicator in4typical cases.4. Through simulation I get the temperature result of the oberver, which verifythat all cases are in compliance with temperature requirements. The thermal designsystem solves many problems with a low active power, such as the cooling of theobserver in orbit, insulation during orbital transfer phase, and the refrigeration ofCCD sensor whose temperature is more than70℃lower than surroundings. 5. Optimize the thermal design of the camera, and ultimately get morereasonable thermal design programs.6. Mechanics calculations on the camera, and get the mirror reflectordeformation results. Then prove the thermal control indicators are reasonable. That isto say the flexible part has great importance in improving the deformation of themirror. The dynamic stiffness of the system meets the requirements of launch andin-orbit.