Optical-mechanical Structure Integration Design Of Large-diameter Space Remote Sensor

Space remote sensing technology plays an increasingly important role in people's livelihood,aerial survey and national defense.With the improvement of the space remote sensing technology,the optical elements of the space remote sensing camera optical machine system need to meet higher requirements in the aspects of position accuracy,mechanical stability and rigid displacement design.The research and design of higher precision,lighter and more stable space remote sensor has become an important task in current space work.In this paper,the model of space remote sensor is studied in an aerospace research institute.The difficulty in design is to meet the requirements of surface precision of primary and secondary mirrors under the premise of lightweight structure.As an important part of optical system,the surface precision and stability of primary and secondary mirrors determine the accuracy and quality of imaging.The front mirror barrel and the reflector bracket are the supporting parts of the primary mirror and the secondary mirror and are the core parts to ensure the accuracy of optical elements.The main load-bearing plate is the main load-bearing structure of the optical machine structure,and its stability determines the stability of the whole structure.Based on the research of material parameters,properties and properties,suitable materials were selected for the primary mirror,secondary mirror,primary mirror bracket,secondary mirror bracket,front mirror barrel and main bearing plate respectively.Through mathematical modeling and 3D design software,the key parameter selection of optical mechanism type and parametric modeling and assembly of structural components are completed.On the premise of guaranteeing the overall stability of the optical machine structure,through mathematical modeling and finite element analysis,the structure optimization of the primary mirror,secondary mirror,secondary mirror bracket and front mirror barrel was carried out to achieve the lightweight goal.ANSYS Workbench software to optimize the structure of space remote sensing camera light machine after statics and dynamics simulation,respectively for the primary mirror and secondary mirror in the gravity and to analyze the surface shape accuracy of the temperature field calculation and checking,and through the study of the modal analysis of the whole machine and work overload analysis to verify the stability and the anti-interference ability of the harsh conditions.This article closely with the practical application of large caliber space remote sensor for high resolution requirements,through research the design thought and theories,with flat back fan long-short back primary mirror and cellular structure,audition and former truss type lensbarrel design thinking as the main body,combined with innovative mirror bracket design,meet the space remote sensing camera is of small volume,light weight,high image quality and resolution and good design requires work stability.The results of this paper provide the design basis for the successful application of the pre-research model to the actual space observation mission and provide an important reference for the integrated design of the optical machine structure.