Facing The Research Of Deformation Measurement Technology In The Space Environment Of Spacecraft With High Stability Structure

With the progress of science and technology in the aerospace industry,the spacecraft is engaged in rapid development with cutting-edge technology.When working in orbit,it will experience harsh space environment characteristics such as high and low temperature,vibration and vacuum,and the key structure of spacecraft will probably produce excessive expansion or contraction,resulting in malfunction ultimately affecting the normal operation of the spacecraft.In order to improve the reliability of spacecraft operation and ensure its service life in orbit,the structural stability of the spacecraft is increasingly demanded.In order to evaluate the structural stability of spacecraft,it is necessary to simulate the characteristics of space environment on the ground and measure the micro-deformation of the spacecraft structure accurately.Measuring result can be a theoretical basis and data support for designer and engineering application.In this program,the micro-deformation test measurement system of the spacecraft stability structure is designed,then constructs DIC measurement system,the strain sensor measurement system,and the temperature control system are determined.Based on the measuring system has been setup,xx is introduced,yy is analyzed or presented the test system of whole micro-deformation measurement,the paper comprehensively describes the source of influencing factors of micro-deformation measurement,and then analyzes the main factors affecting the measurement accuracy of the system.Based on the research foundation and stage task plan of the project,this researcher mainly studies the influence of two spatial environmental factors of vibration and temperature on the accuracy of the measurement system.The following are main conclusions:?1?The central part of the air-floating vibration isolation platform has the highest vibration isolation efficiency,and the best vibration isolation efficiency is in Z direction.Z-direction displacement error can be reduced from 66?m to 15.8?m by correct usage of vibrating isolation table.?2?The ground vibration frequency is concentrated in the range of 0⁵0Hz,and the response magnitude of vibration rate is 10^-5m/s.?3?Based on the digital image correlation measurement system,the CCD camera needs60 minutes of preheating to achieve thermal balance,during which the camera temperature will rise by 10°C to 11°C.?4?Experiment shows that in digital image correlation measurement system,the error value increases with the temperature increase before the temperature gradient increases by30°C.The rate of error change decreases when the temperature gradient is higher than 30°C.?5?Temperature changes will impact on the strain sensor,compensation and correction should be done to the measuring system or measuring results.After correction,the error measuring results can be reduced from 4.7%to 2.99%.Based on the above research results,the measurement system is optimized.The micro-deformation measurement experiment for the parts of are carried out by using the optimized system,which preliminarily verifies the feasibility of the system.Finally,some unresolved problems in current research stage of the project are analyzed and discussed,and the follow-up research work has been planned.