Design And Analysis Of Solid Surface Deployable Antenna Based On Origami

Origami structures can achieve large-scale folding and unfolding,as well as multi-degree-offreedom deformation,and have been widely used in aerospace,DNA folding,metamaterials and other fields.Especially in the aviation field,with the increasing demand for space utilization of vehicles,the folding scheme of spaceborne deployable antenna has always been a research hotspot,and origami is just one of the sources of its folding inspiration.There are two types of spaceborne deployable antennas according to material,namely,flexible and solid surface deployable antennas.The flexible deployable antenna has the advantage of great folding ability,but the disadvantage is that the profile accuracy is poor and the signal interference is large;while the solid surface deployable antenna has the advantages of good mechanical performance and high profile accuracy,and is more suitable for satellites with high operating frequency and high volume utilization.Therefore,compared with the flexible antenna,the solid surface deployable antenna has a broader application prospect.However,the solid surface deployable antenna in the current research has shortcomings such as low retractability and complex driving systems[1-4].In order to improve the folding ability of the solid surface deployable antenna and simplify the driving system,this paper develops a solid surface deployable antenna based on the deployable structure inspired by the origami model,and conducts structural design,parameter optimization,kinematics analysis,dynamic analysis,modal analysis,and the secondary development of segmentation software and prototype development.The main research work is as follows:(1)An origami prototype which can be used as a reference for solid surface deployable antenna is proposed.Based on the origami model of N-point-4N-crease,the relationship between characteristic parameters and folding rate is analyzed.Referring to the existing thick panel methods,the combination of over-constraint mechanism and axial displacement method is selected to realize the movement conversion between the ideal origami model and the actual origami model.(2)Based on the origami deployable structure prototype,a new structure and motion scheme of solid plane deployable antenna are optimized.Referring to the crease of origami prototype,the disk segmentation scheme of solid surface deployable antenna is determined.Based on the Bennett mechanism,the Twin-Bennett extension mechanism is constructed,and it is networked into the deployment mechanism of solid surface deployable antenna to drive the antenna movement.The parameter model of the above mechanism is established and analyzed by using homogeneous coordinates and exponential product formula.Taking the folding rate as the goal and under non-interference constraints,the multi-initial-point sequential quadratic programming algorithm(SQP)is used to optimize the parameters.The optimization results show that the folding rate of the solid surface deployable antenna can be improved by about 5% compared with the previous research.Finally,the deployable mechanism,supporting mechanism,fixing mechanism,hinge and driving mechanism are designed in detail according to the optimal characteristic parameters.(3)The kinematic and dynamic performance of the solid surface deployable antenna is analyzed.Based on the structural design,the analysis of the angular velocity and angular acceleration of the disk surface is completed.At the same time,the dynamic analysis model of the antenna is established,the Lagrange function of the antenna mechanism is deduced,and the driving force required by the sliding plate in the process of antenna motion is solved by Lagrange equation.The Adams dynamic simulation model of the antenna is established,and the simulation results are compared with the numerical results.Finally,the structural dynamic performance of the antenna is analyzed by finite element software,the first six natural frequencies and corresponding arrays of the antenna under different states are obtained,and the harmonic response of the antenna is analyzed.(4)The parametric software of disk segmentation and the prototype of solid deployable antenna are developed.Using the secondary development interface in Solid Works,the parametric modeling process of solid plane deployable antenna is simplified,and the interface program of parameterized segmented solid plane deployable antenna is developed.The prototype of the solid plane deployable antenna is developed,and the functional tests of the deployment and retraction movement are carried out in the real environment to ensure the correctness of the repeated deployment function of the antenna,the relevant structural size parameters and the dynamic analysis of the antenna structure,in the purpose of providing data reference for the design of the solid plane deployable antenna.