A Calculation Method for Existing Railway Plane Curve Fitting

Abstract

The invention discloses a calculation method for fitting existing railway plane curves, which includes: constructing an initialization population according to the initialization radius and slow length; When the dial distance satisfies the iteration condition and the current measuring point is the last uncalculated measuring point in the current curve, and the current curve is the last uncalculated curve in the population, calculate the dial distance of each measuring point of each remaining curve in the population The sum Σ of the absolute values ​​of quantities; with the minimum Σ as the objective function, select the optimal curve of the new generation population; if it is the maximum number of iterations at this time, output the optimal curve; otherwise, merge the optimal curve with the previous generation population into Current population, return to continue to calculate the distance of each measuring point in each curve in the current population. By using this method, the plane curve that best conforms to the actual line shape can be automatically and quickly fitted, and the convergence speed is fast, the calculation efficiency and calculation accuracy are high, and the adaptability is strong.

Description

technical field [0001] The invention relates to the technical field of railway design, in particular to a calculation method for fitting existing railway plane curves. Background technique [0002] Existing railways (railways that have been built and opened to traffic) will undergo irregular deformation after long-term operation, which will affect the speed and safety of traffic. In order to correct the curve of the existing railway, it is necessary to use the minimum sum of the squares or the minimum sum of the absolute values ​​of the distance values ​​of each measuring point as the design condition to fit the best plane curve and calculate the distance of each point. distance. [0003] In the prior art, the plane curve fitting is usually carried out by the deflection method and the coordinate method, wherein the deflection method is derived from the calculation principle of the involute method. In this method, since the arc length is replaced by the chord length, there ...

AI Technical Summary

Problems solved by technology

However, this method has high requirements for the spacing of data points and the format of data acquisition, and when automatically optimally matching the transition curve and radius, there is a high dependence on the initial value of the radius and the length of the transition curve, and the convergence speed Slow, narrow scope of application, etc.

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