| The space-folding structure is a new type of structure that emerged with the aerospace technology innovation.It has characteristics such as high rigidity,high storage rate,and high geometric stability,and is a research hotspot in the aerospace field.The structure-based antenna is one of the application fields of the space folding mechanism.In this paper,parametric modeling,kinematic analysis and modality of tetrahedral frame type antenna are studied.The main research contents are as follows:Through the triangular meshing of the antenna reflection surface,the coordinates of the reflection surface node are obtained.Based on this,the coordinates of the support surface point are obtained from the connection relationship between the reflection surface node and the back surface node.Taking the tetrahedron unit as the basis of the cycle,the position and direction of the axis of the synchro-bar and the web are calculated in each unit,the calculated data is stored in the data file,the data is read using the 3D software interface,and the parametric modeling method is used to establish the Antenna overall model.According to the geometric relationship of the mechanism,the kinematics of the 3RR-3RRR and 3RU-3URU basic unit and the combined unit disk node are analyzed by the homogeneous coordinate transformation method.The disk size was added to the 3RU-3URU theoretical model,and the relationship between the disk size and the kinematics of the disk node was analyzed.Based on the kinematic correlation between the combined units,the kinematics of the 3RU-3URU two-unit combined unit disk node was analyzed.A multi-body dynamics simulation software ADAMS was used to establish a simulation model of a 3RU-3URU two-cycle combination unit,and the kinematics theoretical analysis results were verified.According to the structural symmetry of the tetrahedron-architectureable deployable antenna,the positional relationship of the nodes of the multi-turn assembly is summarized.Combining finite element simulation and experimental analysis methods,the modal vibration characteristics of the 3RU-3URU modular expandable unit were studied.Models with different levels of complexity were established,and finite element simulation results were obtained.An experimental platform was set up to analyze the factors affecting the results of modal experiments using the unique variable method.By further improving the experimental conditions,more satisfactory experimental results were obtained.In this paper,MATLAB and SOLIDWORKS software have proposed a parametric modeling method for tetrahedron-framed antennas to improve the modeling efficiency of such deployable antennas.The motion characteristics of the disk nodes during the unfolding/shelving process of the tetrahedron-frame antenna are analyzed,and the modal characteristics of the tetrahedron-frame antenna are studied,which provides a guidance role for the dynamic analysis and active drive control of this type of deployable antenna.. |
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