| In recent years,my country has developed rapidly in major aerospace fields such as Beidou satellites and lunar exploration projects.More and more complex space docking mechanisms need to simulate high and low temperature environments on the ground for performance testing and reliability assessment.The angular displacement determines the rotational motion.The key to the precise execution of mechanism actions.Therefore,according to the technical requirements for the calibration of angle encoders in high and low temperature environments in my country,it is necessary to develop a set of angle standard devices suitable for high and low temperature environments.At present,the angle standard equipment and the value traceability technology developed at home and abroad are only used in the standard laboratory environment,and the calibration technology of the angle encoder in the high and low temperature environment is lacking.The specific content of the paper generally includes the following:(1)Device design and development.According to the technical indicators,an angle parameter traceability method suitable for high and low temperature environments is established,and a standard device for high and low temperature environments is designed.Through COMSOL simulation calculation,the mechanical part of the device is adaptively designed and the hardware parts are selected;the upper computer is completed.Compilation of measurement and control software.(2)Error Analysis.The error source of the angle standard device in high and low temperature environment is analyzed,and it is found that the standard quantity error and the installation eccentricity error are the main error sources that affect the accuracy of the device.(3)Uncertainty assessment and functional testing.The installation,debugging and measurement of the standard device for high and low temperature environment angles were carried out using standard instruments such as Faru articulated arms,and the uncertainty evaluation of the standard device was completed according to the measurement results of the Faru articulated arm.The expanded uncertainty of the standard device was 9.19 ",to meet the preset index requirements;using this device to test the function of the piece to be calibrated,the experimental result is 97.93",which is in line with the accuracy index of the piece to be calibrated 98",and the test result is qualified. |
