Research On Key Internal Dimension Measurement System Of High-speed Train Body

The high-speed aluminum alloy train body has the characteristics of complex structure and high processing accuracy requirements,and it is the basis for subsequent processing and component installation.It’s quality has a significant impact on the safety of High-speed Railway.The horizontal straightness of the chassis floor inside the train body directly affects the installation of seats,and the internal height of the train body has an important influence on the quality of the train body,so the two become the key dimensions inside the train body.If you can quickly obtain the key dimensions inside the train body,it is of great significance to the quality control,dimension repair and subsequent processes,and will help improve production efficiency.To this end,this paper develops a set of highly efficient and digital measurement system according to the key dimensions features inside the train body.First of all,this article introduces the important components of the train body the basic structure and classification of the chassis,clarifies the measurement object and significance of the measurement system,and then introduces the existing straightness error measurement methods and error evaluation methods.Based on directional search and iterative optimization,the minimum containment area method is optimized to improve its completeness.After mathematical derivation,the corresponding mathematical model is established.Then,based on the comprehensive consideration of the preset function of the inspection system and the weight limitations,stiffness requirements,and complex working conditions of the overall structure,the appropriate materials are selected for the use requirements of each structural component,and the 3D design software Solid Works completes the mechanical structure design of the inspection system,and uses the finite element analysis software ANSYS to perform static and dynamic analysis on the overall structure of the inspection system and its key components.Then,Based on the desired measurement function and mechanical structure,through the hardware system principle design,physical construction,and control logic writing,a PLC-based hardware control system was developed to complete the drive control of the two motors and the multi-sensor voltage Signal data collection and USB data storage;based on directional search and iterative algorithms,a set of data processing software is developed to collate and analyze test data and output and display test results.Finally,the test system is carried out,and the test operation is carried out in the field.The results show that the test system meets the requirements of the design index,and can greatly improve the measurement efficiency and accuracy of the key dimensions inside the train body.