Method for control over longitudinal stress condition of rail bars in continuous welded rail tracks

FIELD: electricity.

SUBSTANCE: longitudinal stress values are defined continuously during the motion of a rolling stock at the mechanical interaction of a rolling railroad wheel with a rail when mechanical oscillations are excited at tested sections of rail bars with recording, converting of the received oscillations to acoustic oscillations with signal amplification, and at the analysis of spectrum of the excited oscillations in frequency and amplitude depending on a value of longitudinal mechanical stress at the rail bar sections. According to results of data processing changes in the spectrum of the excited oscillations are analysed and sections of railroad tracks are identified with deviations in an amplitude-frequency curve in a real-time mode.

EFFECT: increased efficiency of control and safety of train traffic.

3 dwg

 

The invention relates to a method of controlling the longitudinal stress state rail lashes jointless railway track and can be used under current operation of jointless railway track to control the longitudinal stresses in the rail lashes and prevent their emissions or ruptures.

The known method of control of the stress state sections of rail lashes jointless railway track caused by temperature changes and fatigue phenomena from the effects of the wheel on the rail during the passage of the composition, which consists in that prior to laying rail lashes carried out to determine the zones of stress concentration on the self-magnetic field scattering by scanning a magnetometer sensor along the surface of the rail head, a second diagnosis whip when passing on the way 50-150 million tons of cargo, determine the maximum change settings, RU №2454344 C1, B61K 9/08, 27.06.2012.

The known method of diagnostics of rails, namely that the vehicle install the device flaw detection, measurement of roughness and CCTV rails, move the vehicle along the rails, frames measure the condition of the rails can be chosen according to the speed of movement of the transport means�and, detect signals indicating a suspected defects and irregularities, increases the sensitivity of detection signals, delay instantaneous measurement signals according to their relative position and speed of travel of the vehicle so that they belonged to one and the same transverse cross-sections of rails, jointly analyze the signals of all devices on the sections of rails with suspected defect or irregularities, evaluate promising areas of rails, RU №2474505 C1, B61K 9/08, 10.02.2013.

The known method of diagnostics of the track, namely that the instruments of measurement of parameters of rail track mounted on the vehicle which moves along the track, measure the parameters of the track, detect defects and determine their coordinates, you get a graphical image of a section of rail track with the detected deviations in the cross sections of rail lashes, save the measurement results, after the end of the survey section of rail track analyze your results and based on the analysis of the specified image make a decision about the state of the track, RU №2446971 C2, B61K 9/08, G01D 7/02, 10.04.2012.

A device for determining the longitudinal stiffness of the track containing the levers attached to the ends of the rails razora�tion of the joint, the bolt pulls the levers through the spring, the tension force is calculated by multiplying the spring rate on the magnitude of its deformation and longitudinal stiffness of the track is determined by dividing the tension force on the amount of movement of the rail ends, RU # 100478 U1, B61K 9/08, 20.12.2010.

A device for measuring stress in various designs through the polarization-optical Converter comprising a load element, mounted on a controlled object, piezooptical Converter, which converts into an electrical signal the magnitude of stresses in the photoelastic element, and a processing unit of the signal, RU # 115474 U1, G01L 1/00, 27.04.2012; RU # 111646 U1, G01L 1/00, 20.12.2011.

The known method of determining the longitudinal stress state rail lashes jointless tracks, namely that periodically measure the temperature of sections of rail lashes, define longitudinal thermal stresses these areas, simultaneously with the temperature measurement areas is measured in the longitudinal displacements, determine the longitudinal strain plots of rail lashes and longitudinal stresses caused by them, and then determine the longitudinal tension sections to reflect the changes in their lengths and the longitudinal deformations, RU №2469894 C2, B61K 9/08, 20.12.2012; RU №2239547 C1, B61K 9/08, EV 35/00, 10.11.2004.

From�honest ways to determine the longitudinal stress state rail lashes are visual methods of determining the length of the object of control while changing the longitudinal stretching forces - compression and allow for the probability of false alarms or omissions labels, as well as the complexity of the subsequent calculations of mechanical stresses.

The known method of determination of mechanical stresses in the rail bar, including laying rail lashes under certain temperature conditions and with specified effort of her bond with the sleepers, after laying rail lashes in necks rail drill a hole conical shape, measure its diameter Dxand Dyfor two mutually perpendicular axes x and y, perform a subtraction of the measured data in accordance with the expression ΔD=Dx-Dyperform a temperature measurement in the bore of the neck rail, is determined according to the data obtained mechanical stresses in the rail bar and transmit them to the point of diagnosis, RU №2478153 C2, EV 19/00, 27.03.2013.

The known method of determining the longitudinal stress state rail lashes relates to a mechanical method of control, which is implemented in the hard conditions of railway operation, has a high accuracy of calculations of mechanical stresses under low-bandwidth control.

The disadvantages of the known method include the dependence of control results from the chemical composition of rail steel, structure, metal rail, his initial amaniche�ness (magnetic methods).

A common drawback of all these methods is the possibility of minor control on the length of the local part of the route, and poor performance of control.

The known method of measuring tensile stress acting on the rail, whereby the rail is fixed at two or more points on the rail between the points of fixing hang the load of a large mass, with signal-dependent tensile forces, is the frequency response of the resulting oscillatory system formed by the specified rail and suspended to it the cargo, EN No. 2487325 C2, G01L 1/00, 10.07.2013.

This technical solution adopted as the closest analogue of the present invention.

The nearest analogue to the measurement of tensile forces acting on the rail, is carried out without installing on the rail sensors.

However, for implementing the method closest analogue of the necessary preliminary preparation of the investigated section of the route, the lack of trains in the studied section of the route at the time of the work, the impossibility of carrying out work at elevated temperatures because of possible loss of lateral stability of rail lines and, consequently, from the above, poor performance of the control.

The present invention is supposed solution for�ACI, to improve performance of control and enhance the safety of train movement.

The technical result of the invention lies in the implementation of control without prior knowledge of the studied section of the route and the lack of a need it is closed for traffic at the time of the works, by monitoring continuously in motion during the mechanical interaction of a rolling railway wheel and rail, and in the analysis of the spectrum of the excited mechanical oscillations in frequency and amplitude, and is operative to obtain information on the longitudinal cracking of rail lashes jointless tracks, at the expense of information on the lashes with excess quantities compressive or tensile stress, the analysis of spectral changes induced mechanical vibrations and the allocation of track sections with deviations of amplitude-frequency characteristics.

According to the invention this problem is solved due to the fact that the method of control of the longitudinal-stress state rail lashes jointless tracks is to determine the longitudinal mechanical stresses sections of rail lashes to reflect changes in the magnitude of the longitudinal strain.

The definition of the longitudinal stresses is carried out continuously in motion DRI�one of the rolling stock during the mechanical interaction of a rolling railway wheel and rail, upon excitation of mechanical vibrations on sections of rail lashes with registration, a transformation of the received mechanical vibrations into acoustic and amplification of the signal, and analyzing the spectrum of the excited mechanical oscillations in frequency and amplitude, depending on the magnitude of the longitudinal mechanical stresses sections of rail lashes.

According to the results of information processing analyse the change in the spectrum excited by mechanical vibrations and efficiently allocate the railway sections with deviations of amplitude-frequency characteristics.

The applicant has not identified the sources containing information about technical solutions, identical to the present invention, which allows to make a conclusion about its compliance with the criterion of "novelty."

Through the implementation of the distinguishing features of the invention in conjunction with the features specified in the restrictive part of the formula) achieved an important new properties of the object.

Determining longitudinal stresses continuously in the movement of railway rolling stock during the mechanical interaction of a rolling railway wheel and rail, the excitation of mechanical vibrations and in the analysis of the spectrum of the excited mechanical oscillations in frequency and amplitude allows to increase the performance of the control.

Carry out�their analysis of changes in the spectrum of the excited mechanical vibrations and operational allocation of track sections with deviations of amplitude-frequency characteristics, depending on the magnitude of the longitudinal mechanical stresses sections of rail lashes, increases the safety of train movement.

The applicant was not aware of any publication that would contain information about the impact of the distinctive features of invention technical result. In this regard, according to the applicant, it is possible to make a conclusion about conformity of the proposed technical solution the criterion of "inventive step".

The essence of the method is illustrated by drawings, where shown:

Fig.1 - diagram of the acoustic duct system.

Fig.2 is a Graphical depiction of excessive magnitude of the tensile stresses.

Fig.3 is a Graphical depiction of excessive magnitude of compressive mechanical stresses.

In the drawings:

rail - 1,

the source of mechanical vibrations - 2,

speaker system - 3,

Converter of mechanical vibrations in an acoustic system (3) - 4,

amplifying path (system 3) - 5,

spectrum analyzer (system 3) - 6,

the processing unit and storing information (system 3) - 7.

The method is as follows.

The way to control the longitudinal stress state rail lashes jointless tracks is that define a longitudinal mechanical stress sections of rail lashes and when�Alize spectrum analyze changes in the spectrum of the excited mechanical vibrations and efficiently allocate the railway sections with deviations of amplitude-frequency characteristics.

The definition of the longitudinal stresses is carried out continuously in the movement of railway rolling stock during the mechanical interaction of a rolling railway wheel and rail 1.

The definition of the longitudinal stresses is carried out by excitation of mechanical vibrations on sections of rail lashes with the registration of the source of mechanical vibrations 2, converting the received mechanical vibrations into acoustic in the acoustic transducer 4 system 3 and the signal amplification in the amplifier path 5.

The definition of the longitudinal stresses is carried out by analysis of the spectrum of the excited mechanical oscillations in frequency and amplitude in the spectrum analyzer 6, depending on the magnitude of the longitudinal mechanical stresses sections of rail lashes.

The analysis of spectral changes induced mechanical vibrations is carried out by results of processing of the information processing unit and information storage 7 speaker system 3, which analyze the change in the spectrum excited by mechanical vibrations and efficiently allocate the railway sections with deviations of the amplitude-frequency characteristics�of eristic.

The decision to longitudinal cracking of rail lashes jointless tracks or individual of their area and the need for additional work is accepted by the operator based on the analysis of changes of the amplitude-frequency characteristics of the system.

Graphic image of excessive magnitude of tensile stresses (Fig.2) and the graphic representation of excess quantities of compressive mechanical stresses (Fig.3) obtained when performing experimental work on the control of the longitudinal stress state rail lashes on the separate parcel of jointless tracks.

In the proposed method of control the longitudinal stress state rail lashes jointless tracks used methods and devices that are widely used in industry and in particular rail transport, and experimental work related to the spectral control of mechanical oscillations cause, according to the Complainant, the compliance of the method the criterion of "industrial applicability".

Using the proposed method allows to:

- to increase the productivity of control;

- to increase the objectivity of control;

- to improve the quality of the content of rail lashes jointless tracks;

- to improve the safety of train movement.

The way to control the longitudinal stress state ryul�new lashes jointless tracks, consisting in the determination of the longitudinal mechanical stresses sections of rail lashes with changes in the longitudinal strain, characterized in that the determination of the longitudinal stresses is carried out continuously in the movement of railway rolling stock during the mechanical interaction of a rolling railway wheel and rail, the excitation of mechanical vibrations on sections of rail lashes with registration, a transformation of the received mechanical vibrations into acoustic and amplification of the signal, and analyzing the spectrum of the excited mechanical oscillations in frequency and amplitude, depending on the magnitude of the longitudinal mechanical stresses sections of rail lashes, and according to the results of information processing analyse the change in the spectrum excited by mechanical vibrations and efficiently allocate the railway sections with deviations of amplitude-frequency characteristics.



 

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3 cl, 2 dwg

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