Thermal-structural Dynamics Analysis Of Space Tension Cable Net Antenna

As an ideal space-borne antenna structure,the cable-network deployable antenna has the characteristics of light weight,high acceptance rate and good reflector precision during orbiting.In recent years It has been extensively studied and applied.During a satellite orbiting the earth,the satellite will enter the sunshine area and the shadow area periodically,and the large flexible structure subjected to the thermal shock load will produce the heatstructure dynamic response,that is,the thermal vibration phenomenon.The thermal vibration response of a large annular cable net antenna subjected to thermal shock load will greatly damage the accuracy of its reflection surface and adversely affect its operation.In this paper,the thermal-structural coupling dynamics analysis of deployable annular network antennas with different diameters is carried out by finite element method,and the thermalinduced vibration response is predicted.In this paper,the method of mutual iteration between the force density method and the finite element calculation is used to realize the form-finding calculation of the net surface considering the deformation of the truss.The form-finding calculation is carried out for the cable net antennas of different diameters.The results show that under the same force density,the larger the diameter is,the less influence the deformation of the antenna truss has on the form-finding calculation.Based on the form-finding calculation in ANSYS environment,the complete antenna model is established,and the modal analysis of the cable net antennas with different diameters is carried out.Finally,for the annular cable network antenna,the indirect coupling calculation method using the combination of structural calculation beam element and thermal analysis shell element is proposed for the truss structure,and the efficient calculation method using thermal mass element to discretize the model is proposed for the cable network structure.This method is applied to the dynamic analysis of the cable net antenna with thermalstructural coupling.Respectively explores the rope net type developable antenna framework structure thin-walled tube cross section temperature gradient on the single frame structure and the influence of complete cause the vibration response of the antenna,the results of the analysis concluded that the cross section temperature gradient to separate cause the vibration response of the frame structure,the emergence of the cable net structure can reduce the impact,at the same time will reduce the antenna of the whole deformation and vibration amplitude.Finally to the cable net of different caliber to cause the vibration response of the dynamic analysis,the results of the analysis shows that,under 10 m small cable network can expand line won't appear obvious vibration response,with the increase of aperture antenna can appear obvious cause the vibration response,50 m diameter cable net under the certain condition of irradiation antenna appeared the vibration response of a 10-2 m,so need to be focus on large cable network type developable antenna heating problem of dynamic response of impact load.