Research On Motion Control Method Of Instrument Calibration Platform Based On LabVIEW

Using the vibration test platform to simulate the measuring environment of the instrument and evaluate the performance of the instrument is an indispensable and important step in the research and development,production and debugging of various seismic scientific instruments.The accuracy of the instrument test platform in the process of movement will directly affect the reliability of the measurement results.With the continuous development of seismic scientific instruments,the accuracy of instruments has been continuously improved;new high-precision sensors also promote the process of upgrading instruments and higher requirements have been placed on the performance of test platforms.With reference to the development experience of existing test platforms at home and abroad,aiming at the main factors affecting calibration accuracy,selecting appropriate technology and products,designing key devices of the vibration platform,and building LabVIEW-based motion control system are of great significance for realizing the precise calibration of continuous observation gravimeters through vibration platforms to obtain the precise scale values of the instruments,ensuring the authenticity of the output data,and to promote the research of Solid Geophysics including seismology and gravity^[1][2][3].This paper focuses on the following aspects:1.Various motion control principles are analyzed.On the basis of the research of various kinds of shaking table including simulated shaking table and calibration platform of gravimeter,the basic working principle and method are summarized.In view of its limitations,the advanced motion control theory combined with servo electric cylinder is adopted to control the motion of the platform,which can produce better results;2.Based on the virtual instrument software platform LabVIEW,the servo motion control system of the shaking table was built,and the PID parameters were initially set.Due to the influence of various nonlinear factors and the complicated structure of the shaking table itself,it was difficult to identify and calculate the accurate transfer function.In order to achieve a higher level of servo control performance,the fuzzy PID parameter tuning method is used to achieve better real-time parameter tuning,enabling the platform to achieve higher precision motion under instructions;The research results of this paper can be summarized as follows:in order to meet the high-precision motion requirements of the instrument test platform,a design scheme of servo motor cylinder motion control system based on LabVIEW is proposed,and the closed-loop motion control system is constructed using virtual instrument technology.In order to improve the dynamic response performance of the system,PID parameters were adjusted.The test system has been completed,and the test results show that the motion control system has the characteristics of simple structure and high control precision,which lays a foundation for the development of the instrument test platform.