Analysis And Adjustment Of Space Large Cable Net Structure

Satellite antenna is developing in the direction of large diameter, deployable, lightweight, and mesh antenna is one of the main forms of it. In this paper, the problems ofthe model building and nonlinear finite element method, optimization form-finding,structural factors and the accuracy of measurement and adjustment have beeninvestigated. The results show the validity and the feasibility of optimal shapeadjustment method and models. The main research work of this paper can be describedin details as follows:1. The analysis methods of cable nets structures are introduced. Then a newform-finding method, combined nonlinear finite element method and optimization, arepresented. The finite element models of hoop-column and hoop-rib deployable antennasare established and analyzed by means of nonlinear finite element method.2. Taking the single radial cable net unit for example, the influences on the surfaceaccuracy and the fundamental frequency by the size of initial tension and the number ofvertical adjustment cables are given in this paper. Considering the impact of the trussdeformation on the form-finding analysis, several solutions are proposed to improve thestructural rigidity, which will give some useful advice for practical projects.3. Optimal mathematical model is built. It regards the surface accuracy as objective,the size of cable initial tension as design variables, the fundamental frequency,uniformity coefficient of cable tension distribution and allowable tension value asconstrains. The genetic algorithm is used to solve the model. The number of variablesand constrains are reduced by merging method. The result of comparative analysesshows the availability of the optimal form-finding method. And then, it is used toverify the performance of the new type antennas.4. The rigidity triangular prism is designed. On this basis, this paper completes thewhole process which includes the finite element model, optimal form-finding, physicalprototype, measurement and adjustment of the single radial cable net unit. The result, bycomputer simulation, shows that this process can achieve desired accuracy.