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Method for detecting longitudinal force of steel rail based on transverse vibration characteristic of steel rail

A technology of lateral vibration and longitudinal force, which is applied in the field of transportation, can solve the problems of not reflecting the stress distribution, the influence of the state of the rail itself, and the accuracy of the detection results have not been verified, so as to achieve high reliability, less time-consuming, and avoid manual operation Effect

Active Publication Date: 2018-01-09
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method is effective for detecting the stress distribution within a certain depth range below the surface of the rail or the top surface of the rail, but cannot reflect the stress distribution on the entire rail section
At the same time, this kind of method is greatly affected by the state of the rail itself. When there are defects inside the rail such as rail head nuclear damage, the accuracy of the detection results has not yet been verified.

Method used

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  • Method for detecting longitudinal force of steel rail based on transverse vibration characteristic of steel rail
  • Method for detecting longitudinal force of steel rail based on transverse vibration characteristic of steel rail
  • Method for detecting longitudinal force of steel rail based on transverse vibration characteristic of steel rail

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Embodiment 1

[0027] Embodiment 1: as figure 1 , 2 , 3, the present embodiment specifically relates to a method for detecting the longitudinal force of the rail based on the lateral vibration characteristics of the rail, which specifically includes the following steps:

[0028] (1) if figure 1 , 2 As shown, the sleepers 1 are evenly spaced, the distance between the sleepers is d, and a layer of under-rail backing plate 2 is arranged on the upper surface of each sleeper 1, and the rails 4 on both sides are arranged above each sleeper 1 longitudinally, and pass through the rail Fasteners 3 are buckled and fixed to form a seamless line;

[0029] Install several acceleration sensors 5 along the longitudinal interval at the bottom of one side of the seamless line rail 4, the number of acceleration sensors 5 should be at least 3 or more, and each acceleration sensor 5 should be arranged in the middle position between adjacent sleepers 1 , that is, at the 1 / 2 spacing position between adjacent ...

Embodiment 2

[0041] Embodiment 2: as figure 1 , 2 , 3, the present embodiment will be described by substituting actual engineering data on the basis of the method in embodiment 1, specifically as follows:

[0042] (1) Several acceleration sensors 5 are installed at the bottom of the rail 4 on one side of the seamless line along the longitudinal interval. Each acceleration sensor 5 should be set in the middle position between adjacent sleepers 1, that is, 1 / 2 spacing position;

[0043] (2) if figure 1 , 2 As shown, the mass of rail 4 per unit length is 60kg / m, and the sleeper spacing d is measured to be 0.60m. According to the following table, the corresponding "rail lateral vibration resonance frequency - rail temperature change" fitting can be determined. Curve f=A*t+B=-0.1910t+570.3837, where: t represents the temperature change of the rail, the unit is ℃;

[0044]

[0045] (3) Hit the rail waist of the rail 4 laterally with a force hammer at the position where the acceleration ...

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Abstract

The invention discloses a method for detecting the longitudinal force of a steel rail based on the transverse vibration characteristic of the steel rail. The method comprises the steps of arranging aplurality of acceleration sensors at the bottom of the steel rail in the spacing center of adjacent sleepers to acquire transverse vibration acceleration signals generated when the rail web of the steel rail is knocked transversely and transmit the transverse vibration acceleration signals to a data acquisition device for data processing, obtaining an actual value f of a first-order pinned-pinnedresonance frequency of transverse vibration of the steel rail after a corresponding frequency response function and a curve thereof are generated, substituting the actual value f of the resonance frequency into a fitting curve f=A*t+B corresponding to the steel rail to obtain a temperature variation t of the steel rail by calculation, and finally obtaining a longitudinal temperature stress value of the steel rail according to the temperature variation t of the steel rail. The method has the advantages that the non-destructive method does not affect the stability of the rail structure; the method can be used for long-term monitoring of seamless line temperature force; and in practical application, the dynamic load of a train can be used as an exciting source, thus avoiding manual operation.

Description

technical field [0001] The invention belongs to the technical field of transportation, and in particular relates to a method for detecting the longitudinal force of a rail based on the lateral vibration characteristics of the rail. Background technique [0002] With the development of high-speed and heavy-duty railways, seamless lines eliminate the gaps between long rails through welding, reduce the impact of wheel-rails when trains pass, reduce wheel-rail noise and vibration of track structures, and extend the The service life of track and train components improves train passability and passenger comfort. Based on these advantages, seamless lines are widely promoted and applied all over the world. The seamless line eliminates the rail gap between the rails, so that the rail remains smooth and continuous in the longitudinal direction, but because the seamless line rail cannot freely expand and contract in the longitudinal direction under the change of ambient temperature, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/10
Inventor 冯青松刘治业汪玮刘庆杰雷晓燕
Owner EAST CHINA JIAOTONG UNIVERSITY
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