Research On Thermally Induced Vibration Analysis Method Of Flexible Solar Array Based On The Dynamic Substructure Method

The flexible solar array is widely used in large spacecraft such as space station,which has the advantages of light structure,small folding space,long service life and high power supply efficiency.In the space thermal environment,due to the abrupt thermal load generated by the periodic access to the Earth’s shadow area,the flexible solar array is prone to periodic thermal stress,which results in the phenomenon of thermally induced vibration.In order to ensure the on-orbit stability of the space station Power module,the thermally induced vibration of the flexible solar array needs to be analyzed.Because of the complex structure and large scale of the flexible solar array,the finite element model established by the traditional finite element method often contains thousands of degress of freedom,and the modeling and analysis work will cost a lot of manpower and resources.The dynamic substructure method can decrease the freedom of the model and improve the modeling and computational efficiency for the flexible solar array,a large structure with periodic repeating units.In this paper,a substructure model of the flexible solar array is established to study the thermally induced vibration of the solar array based on the dynamic substructure method.Firstly,the modeling method of substructure model of flexible solar array based on the structure characteristics is studied.Then,by comparison with the finite element method,the modal analysis for the substructure model of the central truss and the flexible array is carried out to verify the accuracy of the dynamic substructure method.The influence of the substructure division on the computational accuracy and efficiency of the flexible solar array dynamics problem is studied;Finally,by using the substructure model to analyze the thermal induced vibration of the flexible solar array and selecting the characteristic node to export vibration response,the dynamic substructure method is proved to be accurate and efficient in solving the dynamic problems of large complex structures.