Design And Testing Of Flexible Unloading Structures

Thermal deformation is common in space cameras and its existence has a direct impact on the imaging quality of space cameras.In order to meet the requirements of space camera imaging quality,in view of the large diameter lens under the environment of low temperature thermal deformation caused by the surface shape accuracy degradation,this topic has designed a kind of flexible uninstall support structure is suitable for low temperature optical lens,from the applicability of the material,the rationality of the structure,technology of manufacturing and other aspects of the research,the main work is as follows:Titanium alloy and Yin steel were selected as the materials for flexible unloading support structures.Finite element analysis software is used to analyze the influence degree of temperature change on the mirror surface shape of lens under different support points,and 12 points is finally determined as the best support method.Based on the principle of energy conservation,the stiffness of the flexible unloading unit is analyzed and the key size parameters of the lens flexible unloading unit are designed according to the requirements of the lens stress index.ANSYS finite element simulation was used to analyze the stiffness of the flexible unloading unit,which was basically consistent with the calculated stiffness,and the stress of the lens assembly was analyzed under the low-temperature environment of 160 K.The analysis results showed that the design met the stress index of the lens,which verified the feasibility of the flexible unloading unit.Two processing schemes were proposed for the two selected materials respectively,and the optimal processing method was determined.Three coordinates and projection measurement are used for comparative detection,and three coordinates are selected for comprehensive analysis for measurement.The test results show that the qualified rate of titanium alloy is higher than that of Yinsteel.The temperature impact test was carried out on the two materials and the influence of temperature impact on the geometric accuracy and plane accuracy of the specimen was detected.The test results showed that the titanium alloy material was less affected by temperature impact and its performance was better than that of Yin steel.The size of the titanium alloy specimen tended to be stable after the second temperature impact.The test system was built to test the stiffness of titanium alloy specimens.The test results showed that the designed stiffness measured value of the flexible unloading unit was slightly less than the calculated value,but it could meet the stiffness requirements of the system.In order to improve the deformation resistance of titanium alloy material,solid solution aging treatment was carried out on the specimen,and its stiffness was tested again.The test results show that the flexible unloading structure of titanium alloy processed by this process has high stability under low temperature.In this paper,the design and manufacturing of flexible unloading support structure suitable for low temperature environment is presented,which provides solutions and methods for relevant problems in this field,and lays a theoretical foundation and manufacturing process basis for in-depth study of lens flexible unloading support structure.