Research And Design Of A Kind Of Test Line Gauge Detection System

With the rapid development of modern railway,the operating speed of high-speed railway in China has achieved 350km/h operation.At the same time,urban rail transit is also increasing development,and the speed of intercity trains has also been greatly improved.The test line is an important base for testing and testing train operation safety,the test line has higher and higher requirements for test lines,which is not only reflected in the increased demand for the number of test lines,but also stricter requirements for the quality of the test lines.In order to ensure the safety of the train during the trial operation,it is necessary to have the corresponding track detection technology.The early track detection technology used contact detection,which has low has low accuracy and time-consuming,so it is of great significance to achieve high-precision and intelligent track detection.As one of the most basic parameters of track irregularity,the deviation of track gauge will cause the train to jam or derail.The derailment accident of the train is mainly due to the excessive track gauge,while the too small track gauge will accelerate the wear between the track and the wheel set,resulting in serious traffic accidents and economic losses.Therefore,in order to ensure the safe and accurate test of the rail train,the gauge of the test line must be accurately detected to ensure the stable and safe operation of the train.With the improvement of computer image processing technology,the image-based gauge detection technology has developed rapidly.Based on the research on domestic and foreign testing equipment,this article comprehensively analyzes the advantages and disadvantages of various testing equipment,and proposes a laser-based A non-contact track gauge detection system combining camera and image processing.Firstly,according to the parameter requirements of the detection system,this paper puts forward the overall scheme,and completes the selection of the main hardware equipment.Secondly,it introduces the conversion relationship between the four coordinate systems.The calibration method is used to obtain the internal and external parameters of the camera.The required rail contour line image;high-precision contour lines are obtained through image processing techniques such as image smoothing and sharpening,and the coordinates of the gauge measurement points are obtained from the extracted contour lines,that is,16 mm from the top surface of the rail top.The coordinates of the gauge points are converted into the same coordinate system by coordinate reconstruction.The gauge parameters are calculated according to the distance formula between the two points in space.Finally,the upper computer interface is developed based on Visual C #.Which includes functions such as gauge value display and data saving.At the end of the article,the parameter model simulation is performed by MATLABsimulation software.The simulation further verifies whether the detection system meets the parameter requirements.Through a series of theoretical analysis and experiments,it is verified that the detection system can accurately complete the gauge detection on the premise of meeting the system parameter requirements.At the same time,it also verifies the characteristics of high accuracy,good stability and intelligence of the system,which has a strong reference value for the design of track detection system.