Wheel-rail vertical force continuous measurement method and device based on rail strain

A measurement method and technology of vertical force, which is applied in the measurement of the elastic deformation force of the measurement gauge, etc., can solve problems such as the limitation of the use range, and achieve the effects of simple implementation, accurate and effective data, and simple processing

Active Publication Date: 2009-11-04
CHINA ACADEMY OF RAILWAY SCI CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of continuous measurement of wheel-rail vertical force introduces a special force-measuring backing plate between the rail and the sleeper, which will have a certain impact on the response of the track structure and the track-train system, and the scope of application is limited. It is suitable for abnormal monitoring objects Situations with obvious operating characteristics such as snaking of empty trucks

Method used

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  • Wheel-rail vertical force continuous measurement method and device based on rail strain
  • Wheel-rail vertical force continuous measurement method and device based on rail strain
  • Wheel-rail vertical force continuous measurement method and device based on rail strain

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Effect test

Embodiment approach 1

[0036] like figure 1 As shown, the present invention provides a continuous measurement method for wheel-rail vertical force based on rail strain. This embodiment aims to provide a stable measurement method for continuous wheel-rail vertical force in a short section where a train passes above a single sleeper, including the following step:

[0037] Step a: if figure 2 As shown, take a symmetrical steel rail above a single sleeper 1 as the elastic body 2 for measuring the vertical force of the wheel and rail. The length L of the elastic body 2 is usually not less than 2 times the length of the sleeper support and not greater than 2 times the span minus 2 times the sleeper support length, here the length L of the elastic body 2 is selected to be equal to a span L 0 .

[0038] The research and the following data show that: a series of strains can be found on the neutral axis of the elastic body 2 (such as the shear strain difference between the two ends mentioned later and the...

Embodiment approach 2

[0061] like figure 1 As shown, the present invention provides a method for continuous measurement of wheel-rail vertical force based on rail strain. This embodiment aims to provide a stable, continuous measurement method for wheel-rail vertical force in a long measurement area, such as Figure 7-10 As shown, this implementation mode is based on implementation mode 1, and implementation mode 1 only executes steps a, b, and c once, and implementation mode 2 is based on implementation mode 1:

[0062] In step d, if the length of the effective measurement area does not meet the length requirements of the measurement section, and the obtained combined strain output on the rail above the single sleeper 1 results in an effective measurement area length not less than 1 times the span, then in Also include steps between steps c and d:

[0063]c1. Repeat steps a, b, and c along the rails until the length of the measurement section is met, and obtain the single-span combined strain outp...

Embodiment approach 3

[0073] like figure 1 As shown, the present invention provides a method for continuous measurement of wheel-rail vertical force based on rail strain. Like Embodiment 2, this embodiment aims to provide a stable, continuous measurement method for wheel-rail vertical force in a long measurement area. 2. The difference is that the effective measurement area of ​​the single-span combined strain output in Embodiment 3 (as described in Embodiment 1, here is the single-span effective measurement area with reduced requirements) is less than 1 times the span (generally corresponding to the elastic body 2 The length L is less than one span L 0 ), and the traditional mid-span vertical force measurement is carried out between the two spans, such as Figure 11 shown.

[0074] Embodiment 3 is based on Embodiment 1. Embodiment 1 only executes steps a, b, and c once. This embodiment is based on Embodiment 1:

[0075] In step d, if the length of the effective measurement area does not meet th...

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Abstract

The invention relates to a wheel-rail vertical force continuous measurement method based on rail strain, comprising the following steps: a. one section of rail above a single sleeper is taken as an elastomer for measuring wheel-rail vertical force; b. two groups of appropriate strain outputs on a neutral axis of the elastomer are selected, slopes of all straight lines which are corresponding to different longitudinal action point positions of a sensing region of the elastomer and determined by the strain outputs under two sleeper support reference states are obtained on the same vertical force strain output plane; c. the strain output of passing through the sensing region of the elastomer of wheels is measured, the longitudinal positions of the action points of the vertical force are identified, negative values which are corresponding to the slopes obtained in the step b are taken as combination factors, the combined strain output is obtained by combining the selected two groups of strain outputs in the step b, and the combined strain output is unrelated with the sleeper support state; and d. the vertical force is obtained by the combined strain output of the effective measurement region. A measurement device comprises an elastomer selection unit, a strain selection and parameter obtainment unit, a longitudinal position identification and strain combination unit and an output unit which are connected.

Description

technical field [0001] The invention relates to a ground evaluation method for rail vehicle operation safety, in particular to a method and device for continuous measurement of wheel-rail vertical force based on rail strain. Background technique [0002] Today, the safety of rail vehicles has been paid more and more attention. Among the ground safety assessment methods, the most direct and reliable method to assess the safety of the train itself is the wheel-rail force measurement, especially the continuous measurement of the wheel-rail force. [0003] Due to the fact that the rail strain above the sleeper is greatly affected by the support state of the sleeper, it is difficult to measure the wheel-rail vertical force above the sleeper stably. The existing wheel-rail vertical force measurement is usually realized by the mid-span shear force method based on the rail strain. For example, my country's current railway industry standard "Ground Measurement Method for Wheel-Rail H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/04
Inventor 曾宇清张格明张岩于卫东扈海军
Owner CHINA ACADEMY OF RAILWAY SCI CORP LTD
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