Study On High Accuracy Matching Method Of Rail Profile Based On Geometric Feature

High precision inspection of the rail profile is the basis for accurate profile measurement and wear.The fast profile instrument is a typical method for the non-contact detection of rail rails using a combination of two-dimensional laser camera-type sensors with multiple lines of optical plane coplanar mounting.The strict symmetrical installation of each laser sensor is to ensure that the sensor data correctly overlap,to ensure rapid measurement accuracy of the key instrument,which will increase the measurement system manufacturing,assembly and debugging difficulties.In order to reduce the influence of symmetry on the measurement accuracy,it is a feasible solution to calibrate the light plane of the sensor line structure.On the basis of analyzing and summarizing the existing method of linear plane coplanar method,this paper presents a new type of line-structured optical plane calibration method,which is based on 00-level flatness standard block,Equidistantly extract the appropriate data points,through the angle transformation,and using Levenberg-Marquardt algorithm for its non-linear iteration so that they are on the same contour line.The calibration test results show that the repeat-ability of the contour line can reach 0.00133°,and the precision of the profile gauge after calibration is 7.7m,and it has the characteristics of low equipment and simple operation.In general,the rapid profile gauge is installed on the rail inspection vehicle,and the rail profile of the steel can be realized by the actual rail gauge of the steel.The continuous,fast and accurate measurement of the rail profile and wear can be realized.In the process of rail rail profile detection,due to the uneven track will cause the track car vibration,snake,roll,twist,etc.,resulting in laser camera sensor data can not be directly matched rail track.In order to solve the influence of body vibration on rail rail profile matching,this paper presents a method of matching rail based on the inherent geometric characteristics of rail.And the spatial position information of the rail track is obtained by using the calibrated line laser sensor.The radius curve of the outer rail of the rail is 13 mm and the radius of curvature is 20 mm.The Levenberg-Marquardt The algorithm calculates the center of the circle where the three arc curves are located as three feature points.The two feature points are matched and matched with the corresponding standard points as the matching reference points.Outside the roll to eliminate the body roll and vibration problems.In the UI interface,there is no misalignment between the pattern and the pre-set standard profile of the detection rails,and the matching method has been Jiangxi sun and moon on the track test car to be verified.Rapid and high precision detection of rail track profile to improve the smooth running of the train,to develop a reasonable scientific track repair strategy is important.The principle that the three centers of circle are not on the same line can determine a plane can achieve the high precision matching of the rail profile.The matching method has been verified on the track detection trolley by sun moon company in jiangxi province.The experimental data show that the matching accuracy of the rail profile can reach 0.005 mm,In the UI interface,there is no dislocation of fitting the rail profile graphic and preset standard profile graphic.Its high accuracy and dynamic measurement of rail wear is very important not only to improve the smooth running of the train but also to develop reasonable scientific repair strategy for wear rail.