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Test method for dynamic characteristics of wheel-rail coupling in rail transit track system

A technology with dynamic characteristics and rail transit, applied in the field of rail transit, it can solve the problems that the dynamic characteristics of the rail system cannot be fully reflected, the test accuracy cannot meet the requirements, the difficulty and the operability limitation.

Active Publication Date: 2019-10-15
SHANGHAI UNIV OF ENG SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former is to measure the vibration response characteristics of the rail by applying an exciting force to the rail under the condition of no vehicle running, while the latter is to measure the response of the rail system under the excitation of the wheel under the condition of the vehicle running, but the difficulty and reliability of the test Operability is limited by operating vehicles and tracks, and the test accuracy of some characteristic parameters such as the dynamic contact force of wheel-rail contact in different directions cannot meet the requirements under the conditions of existing technologies and methods
[0008] At present, the experimental research on the dynamic characteristics of the track, especially the laboratory and field experiments without vehicle operation, is carried out under the condition of no wheel load on the track, and the measured results cannot fully reflect the dynamics of the track system under the wheel-rail coupling state characteristic

Method used

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  • Test method for dynamic characteristics of wheel-rail coupling in rail transit track system
  • Test method for dynamic characteristics of wheel-rail coupling in rail transit track system
  • Test method for dynamic characteristics of wheel-rail coupling in rail transit track system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Such as figure 1 , 3 Shown in , 12 and 14, a kind of rail transit track system wheel-rail coupling dynamic characteristic test method, under the condition of wheel-rail coupling 30, respectively to rail head 24 and wheel rim 13, apply excitation force 41, measure track system 20 and the dynamic response of the wheel-axle system 10, the excitation force and dynamic response are analyzed to obtain the dynamic characteristic parameters of the wheel-rail coupling; the dynamic characteristic parameters of the wheel-rail coupling include: the corresponding frequency response function obtained by the excitation force and dynamic response measurement analysis And the dynamic characteristic parameters of the rail system 20 and the axle system 10 obtained from the frequency response function; the dynamic characteristic parameters include modal frequency, modal shape, modal damping, vibration attenuation rate and noise attenuation rate.

[0044] Such as figure 1 , 12 , 13 and 1...

Embodiment 2

[0071] This embodiment is an experiment in which the wheel-rail coupling condition is loaded, that is, on the basis of the experimental setting of the above-mentioned embodiment 1, the force of the wheel shaft is introduced, and the support (fastener) position of the track is 25 or two buckles above the fastener support. The bogie wheel set system is set in the middle of the fastener support span (L / 2) 26, under the action of the static load of the wheel axle and the dynamic excitation force of the attachment, the dynamic characteristics of the wheel-rail coupling under the load condition and the transmission to the track are tested. The effect of the function.

[0072] The basic experimental setup and measuring equipment arrangement as figure 2 As shown, the hammer vibration method is adopted, and the excitation and response are respectively carried out at the top 25 of the track fastener support and the middle span 26 of the fastener support; Among them, Nh1 to Nh3 are the...

Embodiment 3

[0083] The rail transfer functions shown in the above embodiments effectively confirm the relevant frequency peaks, mode shapes, damping characteristics, etc. by using the modal analysis results of the rail system components.

[0084] Experimental modal analysis can discover the natural frequency, mode shape and modal damping of the axle structure and fastener spring.

[0085] The present invention provides a comprehensive experimental method for studying the dynamic characteristics of the track system, including a plurality of experimental items. This embodiment presents a modal analysis method for the coupling system.

[0086] The modal analysis is described below taking the fastener spring as an example:

[0087] Using the excitation hammer excitation method, the acceleration sensor measures the response of the elastic bar, and uses the method of fixed response moving excitation point for measurement, sequentially stimulates 29 measuring points distributed on the surface of...

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Abstract

The invention relates to a test method for rail system wheel-rail coupling dynamic characteristics of rail transportation. Under the condition of wheel-rail coupling (30), excitation force (41) is applied to a steel rail head (24) and a wheel rim (13) separately, dynamic response of a rail system (20) and a wheel shaft system (10) is measured, and wheel-rail coupling dynamic characteristic parameters are obtained through characteristic analysis of the excitation force and the dynamic response. The wheel-rail coupling dynamic characteristic parameters include a corresponding frequency responsefunction obtained and measured by the excitation force and the dynamic response, and the dynamic characteristic parameters of the rail system (20) and the wheel shaft system (10) obtained by the frequency response function. Compared with the prior art, the test method for the rail system wheel-rail coupling dynamic characteristics of rail transportation accurately reflects the dynamic characteristics of the rail system in the wheel-rail coupling state under the wheel load, and achieves the advantages such as higher testing accuracy.

Description

technical field [0001] The invention relates to a rail transit technology, in particular to a method for testing the dynamic characteristics of wheel-rail coupling of a rail transit rail system. Background technique [0002] In recent years, rail transit has developed rapidly, and the number of railway kilometers has doubled. Rail transit includes both passenger transport and freight heavy load; rail transit passenger transport includes both high-speed rail, intercity railway, subway and tram, etc. During the operation of the rail system, its dynamic characteristics have many impacts on rail traffic, including driving safety and comfort, maintenance and management of vehicles and tracks, transportation operating costs and economic benefits, etc.; at the same time, rail traffic brings The environmental vibration and noise pollution is also closely related to the dynamic characteristics of the wheel-rail coupling of the track system. [0003] However, there are many problems...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B61K9/08
Inventor 王安斌肖俊恒闫子权高晓刚周伦彬
Owner SHANGHAI UNIV OF ENG SCI