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A simplified dynamic model of a dish antenna in satellite is established in this article.The modelcan be easily used to analyze the dynamic behaviour of the antenna structure.In terms of the simplifiedmodel,effects on dynamic characters due to the disorder of parameters are investigated in details.Thefrequencies calculated by the simplified model accord with those computed by ANSYS.Based on the modeshapes of disordered and perfect structure,the influence law and varying trend of dynamic characters ofantenna structures in satellites produced by stiffness and mass of antenna ribs,stiffness of antenna mem-branes and angles between adjacent ribs,are obtained.The analyses in the paper indicate that the effectsby disordered parameters can not be ignored in the dynamic analysis of such structures.
A simplified dynamic model of a dish antenna in satellite is established in this article. The modelcan be easily used to analyze the dynamic behavior of the antenna structure. Terms of the simplified model, effects on dynamic characters due to the disorder of parameters are investigated in details.Thefrequencies calculated by the simplified model accord with those computed by ANSYS.Based on the modeshapes of disordered and perfect structure, the influence law and varying trend of dynamic characters ofantenna structures in satellites produced by stiffness and mass of antenna ribs, stiffness of antenna mem-branes and angles between adjacent ribs, are obtained. the analyzes in the paper indicate that the effects by disordered parameters can not be ignored in the dynamic analysis of such structures.