Structure Design And Simulation Analysis Of Large Rotable Parabolic Cylindrical Antenna

Radio telescope has become a special equipment for space exploration,interplanetary space exploration and dark energy exploration.However,this antenna structure has increasingly become relatively large and movable,since it has improved sensitivity,resolution and observation time.This poses constantly new challenges to the structural design of the radio telescope.This paper takes the IPS radio telescope as the research object,and researches on new antenna structure design.According to the requirements of astronomy detection,this paper put forward the overall scheme of large rotable parabolic cylindrical antenna,and it conforms to the principle of two-center coincidence.Then this paper analyzes the characteristics of the structure,rotation and feed,and defines the key difficulties in the scheme such as lightweight design,drive synergy and attitude measurement.Applying cable-truss structure,including stiff cable,restressed cable and cable-beam structure,this paper designs the reflector structure module,and verifies the rationality of the reflector structure design through preliminary mechanical analysis.Applying the arching principle,with mechanical simulation analysis and optimization design,this paper studies the feeder support modular such as stay cable type,gantry and arch beam.Introducing truss structure system,this paper designs the equal strength antenna pedestal modular.Combined with the results of mechanical analysis,with topology optimization,each module can meet the requirements of lightweight design well.Finally,this paper carries out the mechanical analysis and simulation of the whole antenna structure,which includes the static simulation analysis and dynamic modal analysis under various working conditions such as gravity,wind load and snow load.The results show that the maximum deformation error of the antenna reflection surface is 17.0mm under normal working conditions,and the first-order natural frequency of the antenna is 6.876 Hz.Under severe conditions,the maximum stress is 320 MPa less than 345 MPa,which can meet the technical demand index of IPS radio telescope.According to the two-center coincidence principle of the scheme,this paper introduces GNSS(Global Navigation Satellite System,GNSS)measurement technology,and conducts feasibility analysis.This paper designs a variety of schemes with comparative and analysis,and also builds measurement platform,develops measurement data processing program and conducts measurement experiment.The results show that the error of the measurement scheme is less than 0.2°,which can meet the technical requirements of the IPS radio telescope.The large rotable parabolic cylindrical radio telescope has its unique advantages of novel configuration and small mass diameter.It lays the technical foundation for the engineering design of the IPS radio telescope,and provides a technical reference for the other similar antenna structures.