Morphological Analysis And Structural Optimization Of Peripheral Truss Movable Antenna

The large space deployable antenna is the basic equipment of communication technology,earth observation and military electronic reconnaissance,and is an important part of space science and technology.As a kind of structure form of cable-net antenna,hoop-truss antenna has the advantages of high accuracy of profile,low cost,quality stability with the increasein equal proportion of caliber,is developing towards the direction of the large-caliber,high precision,and contains a high research value.The form-finding of cable-net surface is one of the important aspects of the study of the cable antenna,which is the precision control of surface accuracy in design phase.The effect of truss deformation on the form-finding was rarely considered in current study,but with reducing truss stiffness due to the antenna size increase,this effect becomes more difficult to ignore.Therefore,it is of great significance to research surface accuracy control and overall structureoptimization of cable-stayed beam of antenna.This paper involves three aspects:Firstly,three-dimensionalcable-net was chosen,cable-net model and hoop-truss model based on APDL were set up and Using it as a base,parametric model of antenna cable-stayed beam which hascaliber of 16 m and focal length of 10 m was established;Secondly,the truss stiffness evaluation methodbased on tensile deformationcriterion of cable-net was established,and the effects of the truss bar cross section shape and cross section parameters on its stiffness were analyzed,and truss stiffness compensation method was proposed;Modal analysis of truss structure was carried on,and then theinfluence law of truss parameters,the hinge bar and the tension of cable-net on the fundamental frequency and the truss antenna length error on the profile accuracy were studied,whichprovides reference for the establishment of antenna structure optimization model.Finally,the mechanical characteristics of cable-net structure were analyzed;the method and process of morphological analysis and structural optimization were established the combined Isight and ANSYS with optimization algorithm and the lightweight design of truss structure was carried on;The form-findingmethod based on controlling cable-net nodal displacementsusing vertical cables was proposed.Pure cable-net and cable-stayed beam optimization model wereset up,and respectively using MIGA algorithm and the NSGA algorithm,the optimization modelswere solved.By comparing with other literature reviews,the research results showed thatform-finding design data of high accuracy of profile and evenly distributed tension could be obtainedby the form-findingmethod based on controlling cable-net nodal displacementsThe research of this thesis proposes a design schemewhich can comprehensively reflect its antenna design requirements and provides valuable reference for the method for the form-state analysis of large-calibercable-net antenna.