Method to determine elastic deflection of rails

FIELD: railway transport; permanent way.

SUBSTANCE: invention relates to methods of measurement of displacement of rails under action of movable loads. According to proposed method, horizontal mark is made on nonworking face of rail and magnetized metal rule is attached to nonworking face of rail so that visible division on rule is parallel to horizontal mark on nonworking face of rail. Then geodetic stand is installed stationary out of the limits of track, and video camera is rigidly secured on stand. Definite focal distance is chosen, and horizontal collimating ray of video camera is directed perpendicular to nonworking face of rail to get simultaneous image of mark and rule division. Video frame of rail in unloaded state is fixed. Rule is removed. Then, without changing position of video camera and focal distance, video survey of change of rail level, when train passes, is carried out. Data, thus obtained, are compared by registration of frames of initial and loaded state of rail in computer program for processing of video frames. Difference in positions of rail head is revealed by displacement of horizontal mark relative to its initial positions, and elastic deflection of rail is determined in divisions of rule.

EFFECT: facilitated measurements, possibility of storing results of measurements.

2 cl, 3 dwg

 

The invention relates to methods for measuring displacements of the rails or parts thereof when exposed to moving loads, in particular the deflection of the rails when driving a train.

The known method (Some results of experimental determination of stiffness ways: Sat. scient. Tr. "Studies of the interaction of the way and rolling stock. - Proceedings of DIIT, vol. 148, 1974. P.9-16), when the monitoring section of railway track equipped with prohibere, elastic deflection path is relative to the piles scored on the distance from the railroad tracks. On stilts strengthen Reiki, serving as a base of reference.

The known method is sufficient in most cases the accuracy. The disadvantage of this method is that the registration of the values of the elastic deflection of the rails can not be done while driving a load device, for measuring use prohibere with record results on the paper.

The closest in technical essence of the present invention is a method using a laser (Kostenko FB TO the question about the possibility of using lasers to measure linear displacements of the elements of the path: Sat. scient. Tr. "Studies of the interaction of the way and rolling stock. - Proceedings of DIIT, vol. 151, 1974. S-132), including the perception is moving laser beam photoelectric receivers attached to the rail head and the recording of signals Svetlichnyi oscilloscopes or magnetography.

The disadvantages of this method is that the variation of displacement of the laser beam is not fixed in the memory of a device, composed of a mounting device for implementing the method, photoelectric receivers and electric wires going to them, require protection from external influences, primarily the weather.

The purpose of the invention is the determination of the deflection of the rails under moving load, the ability to store measurement results in the storage device, simplifying the instrumentation of the method.

This goal is achieved by the fact that they use a constant horizontal label, applied to the head rail of the rail, as the rate of movement of the rail when moving train.

The invention consists in that on the outside face of the rail rail cause horizontal label, affixed to the outside face of the rail rail magnetized metal ruler so that the apparent division on the ruler is parallel to the horizontal mark on the outside face of the rail rail then outside the path of a stationary set of geodetic tripod, rigidly fixed on it video is the Amer, choose a specific focal length, direct horizontal sighting beam of the camera perpendicular to the outside face of the rail rail thus, to obtain simultaneous image labels and tick marks line, fix the frame rail in the unloaded condition, clean line, then, without changing the position of the camera and focal length, produce a video of the level change of the railway rail when passing train, compare the data obtained by combining frames of the video source and loaded condition of the railroad rail to a computer program for processing video images, record the difference between the positions of the head rail rail the horizontal offset of the label relative to its original position and determine the elastic deflection of the railway rail in divisions line, when this video is done using a digital video recorder.

Figure 1-3 shows the scheme of the method of determining the elastic deflection of rails.

Figure 1 shows the layout of instruments and devices for video train rails without load, including podrelsovoe base 1, rail 2, a metal ruler 3, the horizontal label 4 (type a, level I), VI is neocamera 5 on geodetic tripod 6.

Figure 2 shows the layout of instruments and devices for filming rails under moving load, comprising in addition, with respect to figure 1, the wheel 7 of the moving train and the absence of a metal ruler 3, with the horizontal mark 4 (view) moved from level I to level II.

Figure 3 presents a scheme of combining frames of the video source and loaded condition of the railroad rail.

The proposed method is as follows.

On the selected section of railway track, with the aim of determining the elastic properties of the path or to verify the data on the deflection of the rails received in other ways, for example by using a car photobleachable laboratory design NGO "Spetsmash" (EN 2063492, IPC 6 EV 2/00, EV 35/00. Maluckov S., V.V. Osipov, A.G. Pakhomov, Ahonen L.A. Way of testing the rails and the device for its implementation. - Publ. 10.07.1996), on the outside face of the rail rail 2 is applied horizontal label 4 in the form of risks or attach the sticker paper with pre-printed label. Then fix on the outside faces of the railway rail line 3. Outside of the way place geodetic tripod 6 (or tripod for precision measurements), which set the video camera 5 so that the s in the camera viewfinder appeared horizontal label 4 and the dividing line 3. Horizontal sighting beam camera 5 should be perpendicular to the outside face of the rail of the rail 2. Further rigidly fix the video camera 5, thereby locking a certain focal length F, fixed to the frame rail of the rail 2 in the unloaded state (figure 1, view a, level I), remove line 3. This preparation for the dynamic part of the measurement ends.

Without changing the position of the camera 5 and the focal length F, to produce a continuous video reposition rail rail 2 when driving on it train, watching thereby moving the label 4 with level I (figure 1, view A) to level II (2 view).

After the shooting on this selected area depending on the objectives of the measurements or move on to another area, or proceed with the treatment results. Transfer the image files from the camera 5 in the computer (diagrams not shown). Using one of the programs for processing video conditionally divide the screen of the computer monitor into two parts, one of which establish the image of the frame of the label 4 and line 3 with no load, and in another part of the computer monitor is placed in the frame after completing the wheel 7 on label 4.

Comparing the images on the first and second parts of a computer monitor relative activities is but image line 3, determine the difference between level I and level II ruler increments. The measurement accuracy of the proposed method is determined by the magnitude of the focal length F and can reach 0.1 mm, which also allows you to check the data of measurements of the elastic deflection of rails carried out by other means and devices.

Thus, the proposed method allows to determine the deflection of the rails under moving load with the ability to store measurement results in the memory camcorder. The method is simple to implement, does not require expensive tools and equipment, in the manufacture of measurements visually observed real picture of the moment of passage of the movable load on the railway track with the possibility of multiple viewing and comparison of results in different periods of time.

1. The method of determining the elastic deflection of rails, comprising measuring the level of a railway rail in the unloaded state, the measurement of the level of train rails in a loaded condition, the treatment and comparison data, characterized in that on the outside face of the rail rail cause horizontal label, affixed to the outside face of the rail rail magnetized metal ruler so that the apparent division into Lin is ice was parallel to the horizontal mark on the outside face of the rail, then outside the path of a stationary set of geodetic tripod, rigidly fixed on the camera, choose a specific focal length, direct horizontal sighting beam of the camera perpendicular to the outside face of the rail so as to obtain simultaneous image labels and tick marks line, fix the frame rail rail in the unloaded condition, clean line, then without changing the position of the camera and focal length produce a video of the level change of the railway rail when passing train, compare the data obtained by combining frames of the video source and loaded condition of the railroad rail to a computer program for processing video images, record the difference between the positions of the head rail rail offset horizontal the label relative to its original position and determine the elastic deflection of the rail of the rail divisions of the ruler.

2. The method of determining the elastic deflection of rails according to claim 1, characterized in that the video produced by digital video cameras.



 

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FIELD: railway transport; rail track checking facilities.

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5 cl, 5 dwg

FIELD: railway transport; testing facilities.

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6 cl, 3 dwg

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2 dwg

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3 cl, 4 dwg

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6 cl, 6 dwg

FIELD: railway transport; permanent way testing facilities.

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4 cl, 6 dwg

FIELD: railway transport; track maintenance.

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4 cl, 5 dwg

FIELD: railway transport; permanent way.

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5 cl, 3 dwg

FIELD: railway transport.

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2 cl, 1 dwg

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