Research On Laser Ranging System Based On Phase Method

In the assembly process of the EMU interior cover,it is usually completed by traditional trial and grinding methods.Many assembly occasions are assembled by the experience of the workers.Some parts require many trials to complete,low efficiency and time cost.High,unable to adapt to the modern production requirements of the product.This paper designs a laser ranging system that improves the assembly efficiency during the assembly process.During the operation,the length of the middle roof,side roof and side wall panels of each car interior of the EMU and the distance after installation are measured in real time.In this process,the comparison between measurement data and design data is realized,the number of trials in the assembly process is reduced,and even the number of trials and trials is eliminated,the degree of manual participation is reduced,and the assembly efficiency of the interior cover of the EMU is effectively improved.Minimize the impact on the shape and appearance of the interior,improve the assembly sealing performance,performance,and improve the ride comfort and the service life of the vehicle.In the process of researching digital assembly,considering the automation requirements of the enterprise in the process of implementing the manual assembly,the system detects the length of the installed mid-top board,side roof and side wall panels and the distance that has not been installed,and can calculate the entire passenger compartment in real time.Whether the decorative cover is evenly arranged and adjusted in time;on the other hand,compare the detected data with the design data retained in the system,and find the deviation of the current assembly in time,and correct it in time.The main research contents of the paper are arranged as follows:(1)According to the existing results of laser ranging theory,three-point laser ranging is proposed,and a phase-based laser ranging system applied in the assembly process of high-speed rail interior parts is designed.The transmission and reception of data are realized by means of wireless transmission.(2)Analyze the requirements of the system and develop an overall plan for the ranging system.Theoretical research and design of system hardware are carried out from the aspects of working principle,component device,device workflow and circuit design.And made into a real thing.The C language is used to program and control the used microcontroller.In the VB language,the high-speed rail interior parts assembly automatic ranging system software was developed for the data processing and real-time display.The data can be saved for later comparison with the original data.(3)Functional simulation of the design circuit,using the Bayesian risk-based Kalman filter algorithm,filtering the direct data measured by the three data acquisition terminals and combining the simulation to correct the algorithm parameters and obtain better algorithm parameters.To improve the accuracy of the test system.(4)Complete the experimental verification.Through three data acquisition terminals,the installation errors of the three laser sensors are calibrated to reduce the measurement error.The cumulative error of the length of the top plate of the No.1 car of the EMU was tested,which guided the assembly process.The research method of this thesis can be applied to the distance measurement in the assembly process of the top plate,side roof plate and side wall panel in the EMU.The significance of this paper is to improve the automation and detection accuracy of distance detection,and to use the detection system in industrial production to improve assembly speed and reduce time cost and labor cost.