Computing method of existing railway plane curve fitting

Abstract

The invention discloses a computing method of existing railway plane curve fitting. The method comprises the steps that according to initialization radius and buffering length, an initialization population is established; the deflection distance amount of each testing point of each curve in the current population is computed one by one; when the deflection distance amount of a current testing point meets the iterative condition and the current testing point is the last non-computed testing point in the current curve and the current curve is the last non-computed curve in the population, the absolute value sum sigma of the deflection distance amount of the testing points of the rest curves in the population; the minimum sigma is used as a target function, and the optimum curve of a new generation of population is selected; if the maximum iterations are achieved at the time, the optimum curve is output; and otherwise, the optimum curve and the population of the last generation are combined into the current population, and the deflection distance amount of the testing points of the rest curves in the current population is computed continuously in a returning mode. According to the method, a plane curve which best accords with a practical line shape can subjected to fitting automatically and quickly, convergence speed is high, computing efficiency and computing accuracy are high, and adaptability is high.

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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