Structure Design And Analysis Of Solid Surface Antenna Based On Rigid Origami

With the international attention to space resources,the complexity of space antennas are gradually increasing and it has been applicated in more and more fields,high-gain and multiband antennas have drawn peoples attention in the field of aerospace.The solid surface antenna has many advantages,such as: high accuracy,large rigidity,good thermal stability,high reliability and so on,thus it naturally broad application prospects and development potential.Based on the rigid origami technology,this thesis studies the deployment structure of the solid surface antenna,the design of the deployment mechanism and the accuracy of the solid surface antenna.The specific work and results are listed bellow:Firstly,multi-vertex five-crease deployable structure is designed.Starting from the box folding mode,a multi-vertex five-crease rigid origami model is designed,and its degrees of freedom are calculated by the adjacency matrix elimination method.According to the relationship between the origami equivalent mechanism and the Myard mechanism,restrictions with reduced degrees of freedom is proposed.Then the folding rate of this folding mode is analyzed,and its application potential in deployable structure is proved.Combined with engineering,considering the effect of material thickness during folding process at different creases,the mathematical constraint model is established.Based on the multi-vertex and five-crease folding mode,the design scheme of flat and parabolic deployable structures is given.Secondly,an unfolding mechanism that drives the movement of the reflective panel block is designed and analyzed.By using the space-like complex vector method,combined with the solid surface antenna folding and unfolding motion parameters,a parallel drive unfolding mechanism based on the RSSR spatial four-bar mechanism is designed,and the same characteristics of the branch mechanism of the parallel mechanism are used to realize each plate on the reflecting surface deploy synchronously.Based on the calculation formulas of degrees of freedom and the circuit equations of the mechanism,the movability of the unfolding mechanism and the movement law of the follower are analyzed.At the same time,the impact problem caused by the non-zero speed of the uniform drive source when the antenna is in place is optimized.With the help of ANSYS,the inherent characteristics of the deployable structure are studied.Through the ADAMS virtual prototype technology,the dynamic characteristics of the deployment of the solid surface antenna and the law of driving torque are analyzed.Finally,an error model was established and the accuracy of the profile was analyzed.The error transfer matrix theory is introduced,and multi-source errors such as manufacturing and hinge clearance are equivalent to component rod length errors.The evolution law of the kinematic error of the deployable mechanism is analyzed,and the output error of the slave is converted into one of the rigid reflection surface error sources.Considering the influence of the repeating accuracy of the moving pair of the reflecting surface and the manufacturing error on the accuracy of the profile,an error model to analysis solid surface antenna accuracy is established.Through Monte Carlo method,the statistical distribution characteristics of antenna accuracy and its key influencing factors are analyzed,which provides a basis for improving the robust design of antenna accuracy.