| The space antenna deployment mechanism is an important part of the satellite antenna system.With the rapid development of satellite antennas,the requirements for satellite antenna deployment mechanisms have also increased.The antenna deployment mechanism provides power for antenna extension.Whether it can control the satellite antenna to be smoothly and accurately deployed to a specified state directly affects whether the entire satellite can work normally.Nowadays,various antenna deployment mechanisms have appeared at home and abroad.Based on the analysis of the advantages and disadvantages of various antenna deployment mechanisms,this thesis studies an antenna deployment mechanism driven by dual motors in accordance with the requirements of the antenna deployment mechanism.By analyzing the function and performance design requirements of the antenna deployment mechanism,the working principle of the antenna deployment mechanism is analyzed in detail,and the implementation plan and main components of the mechanism are determined: motor,deceleration mechanism,composite mechanism and self-locking mechanism.By analyzing the strength and functional requirements of each component,the transmission system is designed,and then the parameter design of the internal parts of each part is completed,and the design of the space antenna deployment mechanism is initially completed.Secondly,the theoretical strength check calculation of the main parts of the mechanism was carried out,and the transient dynamic analysis of the planetary gear meshing and the worm gear meshing was completed by ANSYS simulation analysis software.Under the condition of stable temperature field,the thermal deformation of the base circle of the involute gear is analyzed,and the calculation expression of the tooth profile of the involute gear after deformation is obtained.Furthermore,on this basis,the influence of temperature on the normal backlash between gears during gear meshing is analyzed,and the calculation expression of the normal backlash between gear pairs after gear thermal deformation is proposed.The ANSYS thermodynamic simulation analysis is performed on the gears inside the space antenna deployment mechanism to calculate the thermal deformation of the gears,and the radial clearance and normal side clearance of each gear pair after the gears are deformed.Based on the strength check and thermal deformation calculation,the structure of the preliminary antenna deployment mechanism was optimized to obtain the final deployment mechanism.In addition,a tooling test is performed on the space antenna deployment mechanism in this thesis to test the transmission efficiency and output speed of the entire mechanism.Considering the possible situation that one of the motors in the dual motor is suddenly damaged,and measure the time it takes for the mechanism to reach stable motion again under sudden conditions,and the output speed and transmission efficiency after the mechanism is stable. |
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