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Method for describing railway wheeltrack spacing dynamic connecting state

A dynamic contact and space technology, applied in the direction of railway car body components, railway auxiliary equipment, railway vehicle shape measuring instruments, etc., can solve the problems of wheel-rail contact state inconsistency, wheel-rail detachment, poor accuracy and reliability, etc., to achieve strong engineering The effect of applying value

Inactive Publication Date: 2008-02-06
SOUTHWEST JIAOTONG UNIV
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  • Summary
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AI Technical Summary

Problems solved by technology

In fact, the rail is moving and is an elastic body, and the wheel-rail often detaches. The accuracy and reliability of this description of the wheel-rail contact state are poor, and it does not match the wheel-rail contact state in actual operation.

Method used

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  • Method for describing railway wheeltrack spacing dynamic connecting state
  • Method for describing railway wheeltrack spacing dynamic connecting state
  • Method for describing railway wheeltrack spacing dynamic connecting state

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specific Embodiment approach

[0027] A specific embodiment of the present invention is: a method for describing the dynamic contact state of railway wheel-rail space, the steps of which are:

[0028] a. According to the discrete data points of the wheel and rail profiles, the wheel and rail profile surfaces are generated. There are two ways to obtain data points: one is the actual on-site measurement method, through the test instrument, the rail profile is tested on the on-site railway track, and the wheel profile is measured in the locomotive depot or depot, so that the actual operating status can be obtained. (if wear occurs) the profile of the wheel-rail profile.

[0029] Another method is the discretization method of the theoretical scheme. According to the design drawings, the key parameters of the profile (including the radius of curvature and tangent point) are found, and the discretization is performed according to an equal circular arc. This method can obtain a wheel-rail profile without wear (sta...

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Abstract

A method describes the railway wheel track space dynamic contact state and the steps are as follows: a) generating the wheel and track surface according to discrete data points of the wheel and the steel rail profile; b) according to the preset running speed, working out the vibration displacement of wheel pairs and the steel rail at every moment and finding out the wheel space trace at corresponding moment through rail-track coupled system dynamics computing method; c) calculating the vertical distance between wheel space trace points and the steel rail and finding out left and right side wheel track contact points; d) marking left and right side wheel track contact points at every moment, and connecting the points on left and right side wheels and the points on the steel rail, that is to say, describing the railway wheel track space dynamic contact state. The method shows the complex railway wheel track space dynamic contact state in a visual, simple and more actual way, realizes the study and analysis on the railway wheel track dynamic contact geometrical relation, provides reference for the optimum design and manufacture of the wheel tread and the steel rail profile, and has great technical application value.

Description

technical field [0001] The invention relates to the technical fields of transportation, computer digital simulation, dynamic numerical simulation, etc., and in particular to a method for describing the dynamic contact state of railway wheel-rail space. Background technique [0002] With the development of high-speed and heavy-duty railway transportation, the problems of dynamics, vibration and driving safety are very prominent, and the wheel-rail relationship has become very complicated. At present, during the high-speed test run of a certain type of EMU imported from our country on the passenger dedicated line, the dynamic problems that endanger the driving safety have been initially exposed, which has attracted the attention of relevant departments. For example: on some straight track sections and curved tracks, the wheel load reduction rate (safety index) of high-speed rolling stock is unqualified. [0003] The core of these problems is the dynamic contact relationship b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B61K9/00
Inventor 王开云翟婉明蔡成标
Owner SOUTHWEST JIAOTONG UNIV
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