Thermal-structural Analysis For Support Structure Of Deployable Space Antenna

Deployable space structure is often used as the deployable mechanism andsupport structure of deployable space antenna. With the development of demands andtechnology of aerospace engineering, carbon fiber reinforced polymer (CFRP)composite materials as the representative of advanced composite materials and a lot ofnew space deployable structure system are successfully applied to spacecraft fordifferent missions, but the thermal design and analysis are the main concerns in thefield. In this paper, the transient temperature field and thermal elastic response in thespace thermal radiation environment of typical carbon fiber reinforced epoxy resincomposite material support structure of space deployable antenna was analyzed, andthe material thermodynamic parameters was tested, as well as the ground thermalenvironment simulation and thermal deformation test of the thin-walled pipe.Firstly, the thermal parameters of carbon/epoxy composites was measured to getreasonable computational model and data based on the thermophysical theory. On thebasis of composite laminated theory, numerical model and analysis method aboutthermodynamics were obtained.An thermal vacuum test on the ground was set up to investigate the temperaturefield distribution of the thin-walled pipe on transient and steady state through testresults on key positions and low-temperature strain gauges were used to record thetime-history curve, vacuity better than10-3, high temperature60°C and lowtemperature-130°C. Meanwhile the numerical simulation was compared with the testto verify and improve the applicability of the analysis method and material test valuein this paper.Numerical simulation was performed on the response of the thin-walled barframe structure subjected to the thermal radiation in the Geosynchronous EarthOrbit(GEO), the continuous transient temperature field was obtained precisely and thedistribution laws in several typical position was discussed thoroughly. Then thermalstress and strain were calculated for the frame structure and the laws of thermoelasticresponse was given. Also dynamic properties and thermal vibration at the earthshadow of the structure were presented respectively, the results included transientthermal stress and displacement etc.Finally, thermal response of the prestressed cable and membrane reflect-arraywere evaluated, the film reflect-array and the cable-strut structure were investigatedfor the thermal radiation and the results were analyzed such as the temperature fieldand thermoelasticity.