Thermal Deformation Analysis And Form Finding Of Hoop Antenna

The hoop deployable antenna is used in the space environment.The temperature field of the high and low alternation of the space makes the thermal deformation of the antenna change at the moment,and its shape accuracy and tension distribution also change,which affects the stability of the antenna signal transmission.In this paper,based on the force density and nonlinear finite element method,the shape finding method considering thermal deformation is studied.Firstly,the characteristics of space thermal environment are introduced,including space low temperature,space vacuum,space microgravity and space heat source,and their effects on the antenna.Then,the basic assumptions of space heat source parameters are made,and the antenna orbit and its operation attitude are defined.Finally,the space thermal theory is briefly analyzed.Secondly,taking the hoop deployable antenna as the research object,the temperature field of the hoop deployable antenna is analyzed and calculated through the UG space thermal simulation module,which provides the temperature field data for the shape finding of the temperature field.In order to obtain more accurate data of temperature field,a method of building simplified model of metal hinge is proposed.The space thermal simulation of antenna model considering metal hinges is carried out,and the difference of temperature field of antenna model with or without hinges is further compared and analyzed.Finally,the thermal deformation analysis model is established,and the worst condition of thermal deformation under the temperature field is obtained.Then,based on the force density and the nonlinear finite element method,the shape finding method considering the space temperature field is further studied,and the shape finding analysis of the worst condition considering the temperature field is carried out.