Data Acquisition And Design Of Analysis System For High-Speed Vehicle Body Assembly

In today's society,high-speed trains play an unparalleled role in the transportation industry.In order to meet the demand for high-speed vehicles and the development of high-quality requirements,the quality inspection methods for high-speed vehicles also need to be more automated and precise.At the same time,due to the high-speed vehicle compartment size detection is a large part detection,the ordinary part detection method is not suitable for high-speed vehicle effective detection,and the high-speed train's operating speed continues to increase,so the requirements for high-speed train manufacturing quality is increasingly strict,how using the large-scale space coordinate measuring equipment with flexibility,and portability to acquire the spatial coordinate information of large parts of the vehicle body,using certain data analysis methods to coordinate transformation and data fitting,to improve the detection efficiency and detection accuracy of the vehicle body assembly data,For the high-speed train quality inspection and automated production has important practical significance.Firstly,based on the analysis of the data acquisition requirements for high-speed vehicle body structure and body assembly,combined with the manufacturing process of the train body,the principle of selecting measurement points for each part of the structure part and the body part to be measured is studied,and the 3D data measurement is achieved through data matching.Aiming at the problem of measuring blind spots in some measurement points of the vehicle body,the auxiliary measurement target structure and data compensation algorithm are designed according to the structural features of different measurement points.Secondly,based on the analysis of the difficulty of high-speed vehicle body assembly measurement and the demand of measuring instruments,and for the high-speed vehicle structural characteristics and the precision requirements of the inspection process,the Leica total station measuring instrument was identified as a three-dimensional data acquisition device for high-speed vehicles.The measurement principle of Leica Total Station was analyzed,and the measurement errors of the total station ranging and anglemeasurement were analyzed,and the corresponding compensation methods were given.Thirdly,comparative analysis of high-speed vehicle body-related measurement methods and their advantages and disadvantages,combined with multi-station measurement and transfer station measurement methods for longer body lengths and multiple measurement point distributions,improves the existing measurement methods and ensures measurement accuracy.At the same time,it also has the flexibility of transfer measurement.At the same time,in order to obtain measurement results that meet the accuracy requirements,this paper organically combines the least-squares method and the similarity transformation,and proposes an optimal similarity transformation method to achieve the fitting calculation of the test data,so that the resulting data is closer to the actual data.Finally,a vehicle body measurement software system based on VB platform is designed,and functional modules such as information management,coordinate transformation,and data processing are developed,which can automate the processing of high-speed vehicle assembly test data and the theory of measurement data and vehicle body.The three-dimensional data model is compared to evaluate the vehicle body manufacturing accuracy.The validity of the system was verified by data testing experiments on the CRH380 BL mid-train chassis.