Design And Kinematics Analysis Of Curved Truss Deployable Antenna Mechanism

The curved truss folding antenna mechanism as a satellite antenna support mechanism.It is one of the important research fields of folding mechanism.It has been widely used in satellite communication,remote sensing measurement,space exploration and military reconnaissance.In this thesis,based on tetrahedral and pentahedral unit curved truss folding antenna mechanism design and analysis for the study.On the basis of previous research,surface division,configuration design and unit topology are carried out.A new curved truss antenna mechanism is designed and its degree of freedom analysis and kinematics analysis are carried out.Make prototype and conduct ground unloading experiment.First of all,aiming at the full revolute joint tetrahedral unit mechanism is optimized and the revolute joint axis direction is changed.A new oblique tetrahedron unit is obtained,and the unit topology is carried out to obtain a single degree of freedom parabolic cylindrical frame folding antenna mechanism which can be completely folded.The same idea is used to optimize the full revolute pentahedral unit mechanism.A new type of oblique pentahedron unit is obtained,and a new parabolic cylindrical frame deployable antenna mechanism is obtained after the unit topology is carried out.Basic unit and combination unit based on 3RR-URU.The number of degrees of freedom is analyzed by the equivalent method,and the number of degrees of freedom is verified by the screw constraint matrix obtained by graph theory.The motion law is analyzed and verified by simulation.The minimum number and position of drives are obtained and analyzed.Ensure the reliability of the deployable antenna mechanism in orbit.Based on optimized oblique pentahedral unit mechanism.Based on the basic principle of antenna topology,a new method of surface division is obtained.The oblique pentahedral unit mechanism is further expanded to obtain two different oblique pentahedral units.A new single-degree-of-freedom parabolic reflector truss deployable antenna mechanism is formed by the topological combination of two different oblique pentahedron elements.The screw theory is used to analyze the degree of freedom of the antenna mechanism and calculate its motion law.The Adams software is used for simulation verification.The model of parabolic reflector truss deployable antenna is established by SolidWorks software.The prototype is made,and the ground unloading experiment is carried out on the existing gravity unloading test bench to verify the theoretical calculation results.