Simulation And Modeling Of Flexible Self-expanding Satellite Antenna With Friction Vibration Damper

The antenna is the core component of satellite-to-ground communication,and its profile accuracy determines the satellite’s top-to-top communication capability.However,due to the large size of the antenna after deployment,low rigidity,and dense low-frequency modes,the coupling resonance phenomenon is very likely to occur during the deployment of the antenna and the satellite’s attitude adjustment process,which makes it difficult to ensure the accuracy of the satellite antenna profile.In this paper,two types of broadband,large energy dissipation and lightweight friction damping structures are proposed for large flexible self-expanding satellite antennas due to the reduction of profile accuracy caused by vibration in space work.They are used for large flexible self-expanding satellite antenna components.Vibration control of lateral vibration and longitudinal vibration.In order to achieve the optimal control effect,the paper proposes to establish a dynamic model that considers the axial and lateral vibration of the satellite component based on the transfer matrix method and the continuous elastic beam model.Based on this model,the dynamic modeling of the satellite natural components with dampers and the optimization of the design parameters of the dampers are carried out to achieve the optimal control of the lateral and axial vibration of the satellite antenna components,to ensure the accuracy of the antenna profile,and to ensure the satellite’s ground Communication ability.First of all,this paper analyzes the causes of satellite antenna vibration,introduces domestic and foreign strategies for suppressing vibration according to the type of satellite antenna vibration,selects the passive control method principle with simple structure and stable control,and establishes pre-compressed thin-walled multi-finger friction The mechanical analysis model of the damping structure and the self-reset elastic-supported friction damping structure,and the analysis of damping energy dissipation,the calculation model of the damping loss factor of the lateral vibration and longitudinal vibration of the antenna expansion member is established.Then,based on the principle of transfer matrix method,the dynamic model of the satellite antenna deployment mechanism considering two types of frictional damping structures was established,and the modal frequency and mode shape of the selfdeployment mechanism were obtained.The modal superposition method and modal force method are used to establish the dynamic calculation model of large-scale flexible self-expanding satellite components.The accuracy of the model is verified by the finite element simulation method.Finally,based on the optimization model of the damping structure of the pre-compressed thin-walled multi-finger friction damping structure and the self-resetting elastic-support friction damping structure,the multi-parameter numerical optimization method is used to obtain the pre-compressed thickness according to the load and the geometric size of the deployed member.The optimal design parameters of the wall multi-finger friction damping structure and the self-resetting elastic support friction damping structure,the specific preloaded thin-wall multi-finger friction damping structure and the self-resetting elastic support friction damping structure are designed.