| In recent years,with the rapid progress of space technology,Space cameras are playing an increasingly important role in studying the earth 's ecological environment and exploring the unknown world of space.As the core component of the space camera,the mirror is continuously increasing in size with the improvement of the image quality requirements of the space camera.The increase in the diameter of the mirror will cause its mirror surface deformation to increase under gravity or when the temperature changes,seriously affecting the space To ensure the imaging quality of the optical system of the camera,in order to ensure that the optical surface of the mirror can have a good shape,a reasonable design of the lightweight structure of the mirror and its supporting structure is crucial.Redesign,combined with the design task of a ?620mm aperture space mirror,this article studies the lightweight design of the mirror assembly.Firstly,the structure of the mirror is light-weight designed.The load environment experienced by the mirror assembly during preparation,launch,orbit operation,etc.is analyzed.Based on previous design theories and design methods,the initial model of the mirror is established,including the use of empirical formulas to determine the thickness of the mirror body,Support points,support position,mirror blank material,lightweight form and lightweight hole shape.In order to ensure that the mirror has good quality and structure distribution,combined with sensitivity analysis,the structural parameters that have a greater impact on the mirror surface shape are optimized for optimization.After optimization,the mirror body mass is 13.6 kg and the weight reduction rate is 78.4 %.Secondly,the support structure of the reflector is designed and improved.By reading a lot of literature,the application conditions and application scope of the four commonly used support forms are analyzed.The cone sleeve,flexible structure and supporting back plate in the form of three-point back support are theoretically analyzed and structurally designed.Among them,the design process of the flexible hinge was introduced,and the design of the entire supporting assembly was finally completed.Finally,the working environment of the mirror component was simulated,and the designed component structure was simulated and analyzed,and the data processing software Matlab was used to fit the Zernike polynomial fitting of the displacement data of the mirror optical surface node.The results show that the mirror component is in static dynamics Under the simulation,the surface accuracy after removing the rigid body displacement meets the design requirements of PV?1/10?,RMS?1/40?,and the fundamental frequency is 121 Hz,which can effectively resist the interference of the external environment and meet the design requirements. |
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