Analysis And Optimization Of Thermal Control In Satellite Antenna Scanning Mechanism

With the rapid development of space science and technology, the demand forsatellite antenna has been increasing, and its technical performance requirements havebecome more sophisticated. Satellite will bear dynamics loads such as vibration, shock,noise and thermal environment which due to the various operations, including take off,stage separation, second ignition, and shut down during its launch. If the stiffness orstrength does not meet the requirements, the parts will be damaged, even causessatellite launch failures when serious. On the other hand, it will withstand thelong-term environmental effects of alternating hot and cold cycles in orbit period. Thehigh and low temperature change will cause the antenna deformation, and thefluctuation can up to±200℃. Large temperature gradient will cause deformation ofthe temperature-sensitive components such as antenna, thereby affecting itsperformance. Therefore, It is essential to do simulation research and the optimizationfor satellite antenna in its design phase.Finite element method is used to simulate the antenna scanning mechanism in thispaper. The paper mainly includes two parts: the dynamics analysis of satellite antennascanning mechanism, the design and optimization of the thermal control system andthermal properties simulation.Do the dynamic analysis for the mechanism to ensure the stability of the institutionsin shock and vibration environments in the satellite launch phase. The finite elementmodel of the antenna scanning mechanism is established to do the dynamic responseanalysis for the mechanism using ANSYS software. Indicates the response of parts ofthe bodies in the mechanical environment conditions to provide theoretical basis anddesign guidance for passing the test.The design of thermal control system for the antenna scanning mechanism takes apassive control measures to ensure the temperature of various parts in antennascanning mechanism within the allowable range in orbit phase to prevent the partsfrom affected or suffer damage. Simulate the thermal performance of the mechanism inorbit environment with the TMG simulation module of I-DEAS software to forecastthe temperature changes and temperature distribution of various components while themechanism in orbit. The calculation result is a design basis for the optimization of thethermal control system to get the optimal solution. Calculate the temperature field of antenna scanning mechanism in orbits under threeconditions to get the temperature cycle changes as well as the impact of differentoperating conditions on the temperature distribution. The antenna is the corecomponent of the antenna scanning mechanism. The antenna is extremely sensitive totemperature, large temperature gradient will cause the antenna thermal deformationThereby affecting its electromagnetic performance. The temperature values ofantenna while the temperature gradient is maximum under three conditions are used asthe initial loads for the further thermal deformation analysis on the antenna reflector tocheck whether the deformation meets the requirement.