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A Rapid Measurement Method of Rail Stiffness Based on Rail Deformation Velocity

A technology of deformation speed and measurement method, which is applied in the direction of railway vehicle shape measuring device, railway car body parts, railway auxiliary equipment, etc.

Active Publication Date: 2016-11-02
WUHAN WUDA ZOYON SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a rapid measurement method for rail stiffness based on rail deformation velocity

Method used

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  • A Rapid Measurement Method of Rail Stiffness Based on Rail Deformation Velocity
  • A Rapid Measurement Method of Rail Stiffness Based on Rail Deformation Velocity
  • A Rapid Measurement Method of Rail Stiffness Based on Rail Deformation Velocity

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Embodiment Construction

[0028] In order to better understand the present invention, the principle of the present invention will be firstly described below.

[0029] 1. The establishment of rail deformation deflection curve model.

[0030] Assume that the rail is an infinitely long beam on an elastic foundation, such as figure 2 As shown, according to the Euler-Bernoulli beam theory and the Winkler foundation model, the deflection curve differential equation of the rail deformation curve can be deduced, as shown in Equation 1, where F is the normal pressure at this point, E is the rail rigidity, and I is the moment of inertia of the rail, k is the elastic coefficient, x is the horizontal distance from the load center, and y is the deflection.

[0031] EI d 4 dx 4 y ( x ) + ky ( x ...

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Abstract

The invention discloses a method for quickly measuring rail stiffness based on rail deformation speed, which comprises the following measuring steps: the measuring carrier travels on the rail at a certain speed; The vertical deformation speed of the rail, and the pressure load applied to the rail by the measurement carrier; the deflection line slope equation group introduces the travel speed of the measurement carrier and the vertical deformation speed of the rail at multiple points on the above-mentioned rail deflection line, and calculates the deflection line parameters; according to the maximum The calculation formula of the deflection value can be used to calculate the maximum deflection value of the rail; according to the calculation formula of the rail stiffness, the stiffness of the rail can be calculated. The invention supports dynamic acquisition, and the measurement results are not affected by factors such as uneven wear on the rail surface, uneven weld areas, and track irregularities. On the basis of rapid measurement, the track stiffness can be accurately measured, which indirectly reduces the consumption of costs. .

Description

technical field [0001] The invention relates to a method for measuring rail stiffness. Background technique [0002] Rail stiffness refers to the vertical load (unit: kN / mm) required for the rail to produce unit subsidence, where the unit subsidence of the rail refers to the unit vertical deformation of the rail under the vertical pressure load. [0003] Track stiffness is an important parameter that affects the vibration and deformation of the track structure, the safety and stability of train operation, and the workload of track maintenance and repair. Reasonable track stiffness can not only ensure the safe and stable operation of the train, but also effectively slow down the wheel-rail interaction. Reduce the dynamic stress of the track structure and keep the geometric state of the track in good condition, thereby reducing the maintenance and repair workload of the rail. [0004] At present, there are many methods for measuring the vertical stiffness of the track, some a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B61K9/08
Inventor 李清泉张德津曹民林红曲旋王新林孙小进马斌
Owner WUHAN WUDA ZOYON SCI & TECH
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