Research And System Development Of The Rapid Measurement Technology For Key Dimensions Of Train Wheelset

The key dimensions of the train wheelset changes easily as the running time increases.The key dimensions shall meet the relevant technical requirements to ensure the safe operation of the train,so maintenance of wheelset and measurement of critical dimensions are important contents of daily maintenance.At present,the measurement methods for the key dimensions of the wheelset are divided into static and dynamic methods.The static method includes manual caliper measurement and non-contact laser measurement.The dynamic method is mainly ground-based train passing measurement.The cost of dynamic measurement is too high,and the industry application rate is lower,so static measurement is the main measurement method.However,the function of the existing static measurement equipment is so single and the key parameters of measuring wheelset require multiple equipment to cooperate with the application,resulting in tedious recording of each measurement result,which influences the comprehensive maintenance efficiency.In view of the above problems,this paper designs and develops a set of hand-held wheelset key dimensions fast measurement system.This system creatively integrates different measurement principles with the reasonable mechanical structure design,and the acquisition module,main control measurement algorithm,network transmission storage,client parameter storage and access of the camera and the laser of this system are analyzed and developed.Considering the high calculation pressure of the image of the measurement system based on the high-resolution camera,the spot center extraction algorithm has been optimized during the measurement of the inner distance of the point laser.According to the moving characteristics of the spot,an algorithm is proposed for cropping the local image containing the spot,and then extracting the spot center accurately;The spot line center extraction algorithm for continuous lines during the process of multi-line structure light tread measurement is optimized,and this optimization algorithm,for searching the optical center at the initial position of the continuous line spot is proposed,which greatly reduces the calculation amount of image processing and improves the measurement speed.Based on the measurement results of the multi-line structured light tread,the wheel diameter measurement base point of each tread contour line is extracted.The circle parameter where the wheel diameter is located is reconstructed by fitting the base point,to effectively calculate the wheel diameter value.Considering the intelligent management and query of wheel key dimensions data,a wheelset data management system based on cloud server is designed.The data is transmitted from the measurement terminal to the server for storage,and the recorded wheelset data can be checked and managed on the client software based on C #.According to the principle of laser and vison measurement and the system structure,a standardized calibration test is designed,which compares with the mechanical caliper measurement method,showing that the designed fast measurement system can meet the needs of field applications,and that the measurement data are recorded and managed conveniently.The measurement speed is more than 10 times higher than that of the mechanical caliper measurement,greatly improving the measurement efficiency.