Synthesis And Analysis Of The Spatial Support Mechanism Of The Aerospace Plane Deployable Antenna

In recent years,the demand for high-resolution imaging and the trend of large-scale development have put forward new requirements for the development of traditional planar deployable antennas.However,most of the existing planar unidirectional deployable antenna support mechanisms are planar linkage mechanisms,and the configuration of the connecting mechanisms during modular expansion mostly comes from experience,lacking systematic and theoretical research.There is little research on the configuration design of planar bidirectional deployable antenna support mechanisms.Currently,there is very little research on the design of planar bidirectional deployable antenna support mechanism configuration.Therefore,this article conducts configuration synthesis on the basic units and unit connection mechanism of the spatial support mechanism of the spatial planar deployable antenna,selects outstanding performance spatial support mechanism of the planar deployable antenna,and conducts in-depth research on its kinematics,finite element,scale optimization,prototype experiments,and extends it to the planar bidirectional deployable antenna spatial support mechanism.This article analyzes the deployment principle of the support mechanism for the aerospace planar deployable antenna.Based on the constraint synthesis method of screw theory,a method is proposed to construct planar unidirectional deployable unit mechanism by adding constraint branches.A series of support mechanisms for the aerospace planar deployable antenna are obtained.Two types of planar deployable mechanisms are selected:9R spatial deployable support mechanism and 3R(2-4R)P spatial deployable support mechanism.Based on screw theory and graph theory,the degrees of freedom,kinematics and deployment rate of 9R and 3R(2-4R)P spatial deployable support mechanisms are analyzed respectively.Two simulation models of spatial deployable support mechanism combination units were established and simulation analysis was conducted to verify the correctness of the theoretical analysis.Performance analysis and comparison are carried out for the two mechanisms,and the results show that the performance of the 3R(2-4R)P spatial deployable support mechanism is better.In order to achieve modular expansion,a new method for synthesizing the configuration of planar deployable antenna unit connection mechanisms is proposed.A series of feasible connection mechanisms were synthesized and optimized for the unit connection mechanism of the spatial support mechanism of the aerospace plane deployable antenna.A spatial support mechanism with shear forks was optimized and constructed.A finite element comparison analysis was conducted between the optimized new configuration and the pre optimized configuration,and its stiffness and stability during the deployment process were improved.In response to the demand for large-sized antennas on satellites,the spatial support mechanism of aerospace plane deployable antenna is expanded in both directions.Based on the position of the satellite body and the number of antenna panels,the deployment scheme of the antenna panel is designed.The configuration of the support mechanism for the plane bi-directional deployable antenna is designed.Kinematic and finite element analysis are carried out,providing important reference for the design of large-sized plane deployable antennas.In order to verify the feasibility of the aerospace planar deployable antenna mechanism proposed in this article,a principle prototype is developed and experimental research is conducted to verify the movement principle and deployment reliability of the mechanism.The research results provide a theoretical and technical basis for the design and development of planar deployable antenna mechanism.