Structure Design And Shafting Accuracy Analysis Of Laser Communication Large Diameter Ground Station

As the photoelectric receiving and transmitting equipment of laser communication,the structure design and shafting precision of laser communication large-diameter ground station are very important to the performance of the whole machine.The shafting precision of the ground station directly affects the pointing precision,and the performance of the whole machine determines the communication quality.In order to meet the pointing precision and imaging quality requirements of the ground station and complete the space laser communication link,it is necessary to ensure that the shafting shakes in the Within the scope of index;through domestic and international research,the overall scheme and structural form of large caliber are designed.Aiming at the problem of shafting shaking,the supporting structure and shaking model are mainly studied.Through finite element and dynamic simulation analysis,design theory and verification feedback are provided for large caliber ground station of laser communication.In this paper,based on the background of laser communication large-diameter ground station,the tracking frame structure and shafting precision of laser communication large-diameter ground station are studied.First of all,through the preliminary investigation,the ground station structure model is established,and a large-diameter ground station in the form of horizontal tracking frame is designed.Aiming at the shaking problem of the shafting,through the discussion of the shaking error of the azimuth pitching shafting of the ground station,the theoretical model of the two shafting shaking is established,and the relationship between the shafting shaking and the pointing accuracy can be obtained.Finally,through the relationship between the two,for the study of the shafting Determine the direction of shaking error.The mathematical model is used to calculate the shafting precision,and then Monte Carlo method is used to simulate the shafting shaking.Finally,the shafting shaking meets the requirements of 3" indexes.In view of the deformation of large-scale parts under stress,the finite element analysis is carried out to ensure the rigidity of large-scale parts at the same time and lightweight;the large-scale parts of large-scale ground station are optimized by using the finite element method,and then the structural mechanics analysis and modal analysis are carried out.Through the simulation,the influence of the deformation of parts on the shafting shaking and the stability of the overall structure are judged.In view of the influence of the dynamic characteristics of the ground station on its performance,the kinematic analysis and electromechanical joint simulation of the ground station are carried out to analyze the tracking performance of the ground station when it is in dynamic operation,and the servo control system of the ground station is tested to test the tracking performance of the laser communication large-diameter ground station.The test results show that the maximum tracking error is 4.82'',which meets the requirements.