RU2291803C2 - Method of measuring vertical rigidities of rail lines by track testing car - Google Patents

Abstract

FIELD: railway transport; testing.

SUBSTANCE: according to proposed method of measuring vertical rigidities of rail lines by track testing car forces are measured by which track testing car acts on wheels when wheel-sets pass each fixed point. At initially different static loads on axle, vertical irregularities of rail lines are measured by means of two wheel-sets using cordless method. Values of vertical rigidities of rail lines are found as ratio of difference of forces acting onto corresponding (left-hand or right-hand) rail line to difference of vertical irregularities of corresponding rail line in fixed point. Mean rigidity of rail track in each fixed point is determined as mean arithmetic value of vertical rigidities of each rail line.

EFFECT: improved accuracy of measurement of rigidity of rail lines.

3 cl

Description

Usage: for measuring the stiffness of rail threads in a vertical plane. The essence of the invention: the method consists in the fact that with the passage of each fixed point by the wheel pairs of the measuring trolley, the forces with which the track measuring car acts on the wheels are measured. Further, with initially different static axial loads, using the chordless method [1, 2], vertical irregularities of rail threads at a specified fixed point are measured with two wheel pairs. In this case, the values of the vertical stiffnesses of the rail threads are obtained as the ratio of the differences of forces acting on the corresponding (left or right) rail thread to the difference of the vertical roughnesses of the corresponding rail threads at a fixed point, and the average stiffness of the rail at each fixed point is determined as the arithmetic mean of the vertical stiffnesses of each of the rail threads.

The invention relates to monitoring the condition of the railway track and can be used for assessment and forecast.

A known method for determining the coefficient of relative stiffness of the base of a railway track and rail and a device for its implementation [3], which consists in registering signals characterizing the magnitude of the deflection under each bogie of wagons, each time at least two distances between the sensor and the reference point are determined the trolley’s wheel closest to the sensor, at which zero deflections of the rail are observed, and the average distance Achen dispersion and rigidity coefficient.

The disadvantage of this method is the local nature of its use.

A known method for determining the curvature of the rail under a loaded wheel, bending moment, stresses from bending of the rail, relative stiffness and elastic modulus of the rail base [4], which consists in determining the relative displacement of three points located on the working surface of the rail head, the mentioned movement of three points determine directly near the loaded wheel, moving at a given speed, and the curvature, bending moment and stress from the bending of the rail, the relative stiffness and modulus rugosti rail base is determined by the respective ratios.

The disadvantage of the above method is the low accuracy due to the lack of consideration of the dynamic interaction of the track and the rolling stock (car).

Closest to the proposed invention is a method of measuring a railroad car stiffness of a rail track [5], which consists in the fact that when passing fixed points with each wheel pair of a rail car, measure the transverse level of the rail track, at the same time measure the forces acting on the axle boxes of the corresponding wheel pair, the results obtained substitute in the system of equations of interaction of the measuring car and the rail when measuring the transverse level under each pair of wheels determine the average stiffness of the track in said fixed point and the deviation from the hardness of each of rails from the average stiffness of the track at the same point.

The disadvantage of this method is the presence of a methodological error and its implementation requires a larger number of force sensors with which the car acts on the rail track.

The objective of the invention is to increase the accuracy of measuring the stiffness of rail threads.

To solve the problem, in a method for measuring the vertical stiffnesses of rail threads by a measuring car using a chordless method, vertical irregularities of rail threads are measured with two wheel pairs. For this, various static loads are preliminarily created on the axis of the measuring trolley. This allows us to determine the vertical stiffness of the rail threads as the ratio of the differences of forces acting on the corresponding (left or right) rail thread, to the difference of the vertical irregularities of the corresponding rail thread at a fixed point. In this case, the average stiffness of the rail track at each fixed point is determined as the arithmetic average of the vertical stiffnesses of each of the rail threads.

The rationale for the proposed method is as follows.

The measured values of the vertical irregularities of the rail threads at various static loads F _l1 , F _p1 , F _l2 , F _p2 can be represented as:

where h _lГi , h _пГi - vertical irregularities of the left and right rail threads, determined by the geometry of the track and measured without load; h _lSti ; h _pSti - vertical irregularities of the left and right rail threads caused by static load; h _lDi , h _pDi - vertical irregularities of the left and right rail threads caused by dynamic loading.

Naturally, h _l1G = h _l2G (h _l1G = h _n2G ). Then the difference in the forces acting on the wheels of the measuring trolley can be represented as:

where vertical stiffnesses of rail threads can be obtained

and the stiffness of the rail track

Thus, the problem of measuring the vertical stiffnesses of rail threads and gauges was solved when measuring forces only on the axle boxes of the measuring trolley. The selection of fixed points of the path is carried out using the sensor of the traveled path (odometer), the step of which is selected as a multiple of the center distance of the cart.

Literature

1. RF patent for the invention No. 2242554 "Method for measuring the drawdown of rail threads" ./ A.M. Boronakhin, V. I. Gupalov, A. V. Kazantsev, S. A. Karpasov, bull. No. 35 dated December 20, 2004.

2. RF patent for the invention No. 2242391 "Method of inertial measurements of rail irregularities" ./ A.M. Boronakhin, V. I. Gupalov, A. V. Mochalov, bull. No. 35 dated December 20, 2004.

3. Patent No. 2116400 Russia. A method for determining the coefficient of relative stiffness of the base of a railway track and rail and a device for its implementation. / V.P. Grigoriev, G.N. Dyukov, N.A. Knyazev, L.E. Sheinman (Russia). - Application. No. 96101917/28. Publ. 07/27/98.

4. Patent No. 208423 Russia. A method for determining the curvature of a rail under a loaded wheel, bending moment, stresses from bending of the rail, relative stiffness and elastic modulus of the rail base. / A.D. Konyukhov, V.A. Reykhard, A.A. Nefedov, V.L. Poroshin (Russia ) - Application. No. 94015384/28. Publ. 04/10/98.

5. RF patent No. 2240244 "Method for measuring the stiffness of a rail track with a railroad car." / Boronakhin A.M., Gupalov V.I., Mochalov A.V., Kazantsev A.V., bull. No 32 of November 20, 2004.

Claims (3)

1. A method for measuring a vertical stiffness of rail threads by a measuring car, which, when passing each fixed point with the wheel pairs of the measuring trolley, measures the forces with which the measuring car acts on the wheels, characterized in that at initially different static axle loads using a chordless the method of measuring two vertical pairs of rails of rail threads with two wheelsets, while the values of the vertical stiffnesses of the rail threads are obtained as the difference forces acting on the corresponding (right or left) rail thread to the difference of the vertical rail irregularities corresponding thread at a fixed point, and the average stiffness of the track at each fixed point is defined as the arithmetic average of the vertical stiffness of each of rails. 2. The method according to claim 1, characterized in that the static load on the axis of the measuring cart is forcibly made different. 3. The method according to claim 1, characterized in that the sensor step of the distance traveled is selected as a multiple of the distances between the wheelsets of the track measuring car.