Research On Structural Performance Of Deployable Antenna Based On Space Thermal Environment

This paper, with thermal analytical studies of satellitic deployable antenna, which describes the characteristics of deployable antenna and significance in-orbit thermal analysis of deployable antenna. We introduce the space environment which deployable antenna are running, main heat transmissibility in space and the heat balance of spacecraft in space.We improved the thermal analysis platform for satellite of general framework and main functions; Researching the deployable antenna modeling techniques of thermal analysis; Carrying out the reconstruction of the ANSYS finite element model to the I-DEAS finite element model; Analyzing radiation function of thermal model for antenna; Completing the equivalent of structure-thermal model and giving the calculating result analysis for the before and after equivalent of in-orbit temperature field and deformation field.Using the thermal analysis platform for satellite to complete four types of truss deployable antenna models including of positive feedback no sag-span ratio, positive feedback sag-span ratio, bias no sag-span ratio and bias sag-span ratio. Calculating in two conditions, four different types of structural forms of truss deployable antenna temperature field in the temperature calculating module, then calculating the correspond model of deformation field by loading calculated temperature field and using deformable calculating module. Comparative analyzing of effect about the deployable antenna of the temperature field and the deformation field on different thermal control coatings and different structures.The alternative of daytime and night in the orbit causes heat change suddenly, this will induce thermally vibrations in the structure. Based on the structure dynamic response analysis of thermal theory, calculating 300 seconds transient temperature field from sunshine to shadow by using I-DEAS finite element software. Calculating response of thermally vibrations by loading calculated temperature field on ANSYS model in-orbit environment. Drawing curve of all directions when the antenna enters into the shadow and verifying. All of above verify that different thermal environment influences the structural dynamics response.