A Calculation Method of Raid Distance for Existing Railway Curves

Abstract

The invention discloses a move distance calculation method of an existing railway curve. An improved PSO (particle swarm optimization) method is adopted for optimizing radius and transition length of a design curve, and then movement distance of each measuring point is calculated. In the optimization process, a minimum quadratic sum or minimum absolute value sum of movement distance values delta i of the measuring points serve as an objective function. The move distance calculation method of the existing railway curve is capable of reducing dependence on an initial value and is high in adaptability.

Description

technical field [0001] The invention relates to a method for calculating the distance of an existing railway curve. Background technique [0002] Curve correction of existing lines always exists in the maintenance and repair business of existing railways. The rope straightening method is generally used in daily maintenance and repair, and the declination method and coordinate method are generally used in major and medium repair operations of lines. This method is oriented to the existing curve rectification problem of overhaul and medium repair business. The deflection method and coordinate method, which have been used for many years, are generally used. They measure the deflection angle of the existing curve and the coordinates of the center line of the line respectively. Among them, the scope of application of the involute method is limited to a certain extent. The error of the calculated setting distance is related to the size of the deflection angle, and there is no theo...

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Problems solved by technology

Among them, the scope of application of the involute method is limited to a certain extent. The error of the calculated setting distance is related to the size of the deflection angle, and there is no theoretically rigorous calculation formula, which makes the error concealed.

Compared with the traditional involute method, the coordinate method has the advantages of rigorous theory and high accuracy of measurement and calculation results, but the existing automatic algorithm is affected by the accuracy and spacing of the collection points in terms of line shape recognition

[0003] The existing method needs to identify the characteristic points of the curve before the optimization calculation to obtain the initial linear parameters, which is sensitive to the initial value of the parameter, and different initial values ​​will lead to different calculation results, so that the correct result cannot be obtained.

Traditionally, the control dial is the smallest. Generally, the sum of the squares of the dials of each measuring point or the sum of the absolute values ​​of the dials of each measuring point is used as the objective function, but there is no clear conclusion on which method is more suitable.

[0004] In addition, the general calculation method fails to take into account the requirements of control points

According to the actual requirements of the site, the data of the radius of the curve and the length of the transition curve (hereinafter referred to as the length of the transition curve) should be integers, and the existing methods do not handle the parameters as integers

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