Research On Temperature Compensation Technology Combined With Virtual And Real Of Large-scale Measurement

Errors caused by temperature changes have a serious impact on the measurement accuracy of large-scale geometric quantities in the manufacturing process of large-scale advanced equipment such as aircraft and ships.Most of the existing temperature compensation methods have disadvantages such as complicated operations and difficult model settlement.At the same time,the research and experiment objects are mostly regular rectangular frame tooling,etc.,for temperature compensation of variable curvature workpieces that can truly reflect the actual on-site assembly conditions.Method research is less.In order to ensure the assembly accuracy of large-scale variable-curvature components on the actual site,greatly shorten the time-consuming operation of large-scale measurement,and minimize the measurement error caused by temperature changes in the large-scale measurement process,the temperature Compensation technology combined with virtual and Real of large-scale Measurement is studied,proposes an optimization method for thermal deformation error compensation in the measurement of variable curvature workpieces.The virtual simulation data of ANSYS thermodynamics and the actual position measurement data of the tracker under large-scale multi-station measurement conditions are merged,and error compensation and nonlinearity are applied.The optimization method realizes the reduction and compensation of the measurement error introduced by the thermal deformation factor in the measurement process of the large-scale transfer station.Firstly,it introduces the basic theory of transfer station measurement and the calculation method of commonly used transfer station parameters.Related researches are carried out on the influence of various change factors in the measurement process on the accuracy of the transfer station measurement,and the influence of temperature changes in the process of large-scale precision measurement is analyzed.The impact of transfer accuracy.Then,the basic principle of thermal steady-state analysis is explained,and the relationship between the thermal deformation offset of the measurement reference point and the temperature change of the variable curvature workpiece under the condition of temperature change is explained theoretically;The physical model of the experimental component performs thermal deformation simulation to solve the simulation thermal deformation parameters.By analyzing the simulation results,it is obtained that the thermal deformation simulation offset of the variable curvature workpiece meets the linear relationship with the temperature change.Subsequently,based on the above theoretical research,a method for compensating the thermal deformation error of the variable-curvature workpiece revolving station was proposed,and a large-scale measurement revolving station accuracy compensation model with thermal deformation parameters was deduced and established.A laser tracker and a fiber Bragg grating(FBG)temperature sensor are used to obtain data such as the three-dimensional position information and temperature of the reference point,and linear regression analysis is used to establish a mathematical model between the thermal deformation offset and the temperature change of the variable curvature workpiece.Calculate the thermal deformation coefficient matrix in the global coordinate system;further,design the uniform temperature field transfer station experiment and the composite temperature field reference point measurement experiment.The experimental results show that the transfer station error compensation method studied above is used to achieve the accuracy of the transfer station.Increased by 79.43% and 76.26%,respectively.A PSO-based optimization method for thermal deformation error compensation in the measurement of the transfer station is proposed,and a multi-parameter optimization model of the above thermal deformation error compensation method is established.The goal is to solve the minimum global total error while optimizing the transfer.The station parameters and the thermal deformation parameters obtained from the experiment are brought into the thermal deformation error compensation model.The calculation results show that the station transfer accuracy under uniform temperature field and compound temperature field is increased by 87.56% and 79.06%,respectively.The large-scale precision measurement temperature compensation technology that combines virtual and real can realize the compensation of thermal deformation errors caused by temperature changes in the large-scale measurement process,and improve the accuracy of large-scale measurement transfer stations,and has important engineering practical significance for large-scale measurement.