Analysis Of Influence Of Locking Mechanism On Antenna Stiffness And Deformation For Spaceborne Deployable Antenna

In recent years,more and more deployable mechanisms have been employed in the landing legs of probe,aircraft wing or telescopic arms.They have many advantages such as simple structure,convenient operation and high reliability.According to the degree of freedom of constraining the reflector,the locking mechanisms can be divided into single-point locking mechanism and multi-point locking mechanism.Most of the locking mechanisms currently installed on rail-mounted satellites are single-point locking types.In order to further study the quality of locking mechanism and the theoretical analysis method of the locking mechanism.Moreover,in order to design new locking mechanism with better performance.The single-point locking mechanism and the double-point locking mechanism are selected for the analysis.The single-point locking mechanism was used in solid deployable antenna and umbrella antenna,and double-point locking mechanism was employed in solid deployable antenna.The finite element software was used to model the locking mechanism and the whole deployable antenna.The contact model is set up in the contact surface of the mechanism to ensure the accuracy of the finite element model.Firstly,the finite element model of the locking mechanism was used for modal analysis to obtain the frequency and mode of the deployable antenna.The analysis results of different types of deployable antennas were compared and analyzed.The results showed that the double-point locking mechanism can provide greater locking stiffness.Secondly,the dynamic simulation of deployed antenna was carried out by using the commercial dynamic software.The factors such as the dynamic impact,the deployment time and ejection rate of pin were evaluated.The locking process of the double-point locking mechanism has little effect on the in-orbit attitude of the satellite.In addition,the thermal deformation analysis of the deployable antenna under high and low temperature was conducted.The change trend of the accuracy of the reflector surface and the size of the residual deformation were compared.Finally,a new type of double-point locking mechanism was designed to improve some aspects,such as gap elimination and deployable precision.The new locking mechanism was described in detail.