Research on Railway Track Fine Adjustment Algorithm Based on Quadratic Programming
In order to ensure the high smoothness of railway operation,it is necessary to test the track irregularity and issue a fine-tuning program for maintenance based on the measurement data.Among them,a way to automatically calculate the fine-tuning scheme according to the track deviation to meet the construction conditions(e.g.adjustment limit,bridge eccentricity,tunnel clearance,etc.)is a difficult problem in track maintenance.In order to solve these problems,the fine-tuning scheme optimization problem was transformed into a quadratic programming model and the corresponding optimization parameters were set according to the actual working conditions in order to realize the automatic optimization.According to the definition of track irregularity,the optimized track deviation was a sufficiently smooth curve in the mileage direction,and the optimized deviation amount and its first-order,second-order and third-order change rates were taken as the optimization objective and given different weights,and the construction constraints were converted into the upper and lower limits of the optimized deviation amount,so that the track fine-tuning algorithm taking into account the constraints and limitations were realized.Compared with the traditional method based on cubic spline curve fitting,this method avoids the selection of spline nodes and can take into account the construction constraints,which improves the efficiency of optimization.In a railway line large machine tamping operation,the proposed method is used for automatic optimization operation,and the dynamic TQI of the track decreases by 28%on average after practical application,which verifies the correctness and feasibility of the method.
railway tracktrack fine adjustmenttrack deviationquadratic programmingspline curve
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