Thermomechanics Analyses For Satellite Turntable In Space

Working in the space, the satellite subassembly must endure more complicated radioactive environment, it will also enter into the sunshine and the earth shadow periodically. Under this condition, the extreme temperature and the temperature fluctuation of satellite subassembly which exceed the permission may influence the working of the instruments inside. Also, the uneven temperature field and the difference of thermophysical properties will result in production of thermal stress and deformation. In order to acquire the compositive influence of space environment, the study on thermal coupling field of satellite two-axis table is done.Firstly, based on the finite element theory of thermal coupling field, all kinds of radiation loads are calculated in this paper, and the loads are applied to the satellite two-axis table in form of equivalent heat flux. The extreme temperature value and field of satellite two-axis table under working are acquired, also, this paper tracks the temperature fluctuation of five key positions on the two-axis table, the analyses of temperature field and curves are performed.Secondly, taking the temperature field as initial conditions, the thermal-structure coupling analysis is performed, the thermal stress and deformation of the two-axis table in the orbit are gained. The paper also acquires thermal stress and deformation fluctuation of the same five key positions in one cycle, both the chorograms and the fluctuation curves of stress and deformation are studied. Moreover, the two-axis table suffers effects of periodic thermal loads, so, the fatigue life is calculated and checked. By the thermal-structure coupling analysis, all the thermal coupling responses of satellite two-axis table are acquired.Finally, a new model used for radiation analysis called space pointolite radiation model is given out. By the thermal analysis of cylinder structure with the equivalent heat flux load model and the space pointolite radiation model, the availability of later is proved. Then, the thermal analysis of the two-axis is performed again with the space pointolite radiation model. After comparing, the space pointolite radiation model is believed to be more accurate and more flexible.