Research On On-line Measuring Method Of Wheel Diameter

The wheels as important running parts of trains,it's quality and safety directly affect train operation safety during the trains is working.With the increase of railway mileage and train speed in China,it is necessary to ensure the quality and safety of train wheelsets in real time.Therefore,it is of great significance for the safe operation of trains to detect the geometric parameters of wheels timely,and it is effectively to grasp the wear condition of wheels in real time.In this paper,an on-line measurement method of wheel diameter based on three-laser displacement sensor is determined,and the principle of on-line measurement of wheel diameter is analyzed,and the system composition and working principle of on-line measurement system of wheel diameter are explained.In this paper,the installation and debugging process of the measuring device is summarized,and a more suitable method for angle calibration of sensor structure parameters is proposed.GUI graphical user interface is established by MATLAB,and linear fitting method is used to improve the accuracy of angle calibration.The error factors affecting wheel diameter measurement are analyzed,and a lot of experiments are carried out in the laboratory and in the field.The experimental results show that,when a metro train passes through the measuring device at a speed of 3-15 km/h,the repetitive measurement accuracy of the measuring device(3?)is less than 0.6 mm,it can meet the requirements of on-site measurement of the metro vehicle detection section.