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针对某型号卫星相机与星敏组合体结构件的热变形试验需求,提出了一种常压热变形复合测量试验方法.在地面常压环境下,采用经纬仪、数字摄影测量相机、激光位移计共3种测量设备,通过搭建测控系统,设计试验工况,制造温度拉偏,精确复合测量试件在各种温度工况下的热变形情况,并进行相互验证,消除外部环境干扰等因素引起的试验件的位移,为验证热变形分析、改进设计提供支撑数据.试验按照试件温度状态分为4个工况、20个子工况,测量得到常压环境下相机、星敏间夹角最大变化量为200″.试验表明,该常压热变形复合测量试验方法完全满足卫星结构热变形的测量需求,探寻了相机与星敏间夹角变化与温度变化间的规律,试验数据与计算结果吻合,并为复杂几何形体的机械零件热变形测量提供了新的测试方法与手段.
Aiming at the need of thermal deformation test for a certain type of satellite camera and Xingmin composite structure, an atmospheric pressure thermal deformation composite measurement test method is proposed. Under normal atmospheric pressure, a theodolite, digital photogrammetric camera and laser displacement meter Three kinds of measuring equipment, through the establishment of measurement and control system, design test conditions, the manufacture of temperature bias, the precise composite measurement of the specimen under various temperature conditions of thermal deformation, and mutual verification, to eliminate external environmental interference and other factors The displacements of the test pieces provide supporting data for the verification of the thermal deformation analysis and the improvement of the design.The test is divided into four working conditions and 20 sub working conditions according to the temperature status of the test pieces and the maximum change of the included angle between the camera and the mini- The amount of 200. "The test shows that the atmospheric pressure heat deformation composite measurement test method to fully meet the needs of the thermal deformation of the satellite structure of the survey, the camera and Xing Min between the angle and temperature changes between the law, the experimental data and calculated results , And provides a new test method and measure for the thermal deformation measurement of mechanical parts with complex geometries.