Method of measuring horizontal irregularities (levering) and curvature in plan of rail lines

FIELD: railway transport; permanent way.

SUBSTANCE: invention relates to methods of checking and forecasting condition of rail track. According to proposed method, running course of body of track-testing car is measured by means of inertia navigational system installed under pivot of test bogie, and running hunting angle of test bogie relative to body is measured by means of angular displacement transducer. Then, using axle box-rail transducers, distance from flanges of corresponding wheels of bogie to rail heads are measured. Basing on obtained information , running courses of rail lines are calculated as running course of body minus running hunting angle of test bogie relative to body minus running angle of parallel misalignment of flanges of wheelsets of test bogie and heads of rail lines. Then running values of horizontal irregularities of rail lines are found as product of bogie base by deflection of running course of rail lines from running averaged courses of rail lines on bogie base calculated from courses of rail lines. Running radii of curvature of rail lines are found by dividing bogie base by measured increment of course angles of rail lines on bogie base.

EFFECT: provision of chordless (single point) method of checking leveling of rail lines.

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The method can be used to monitor and forecast the state of the railroad tracks and is that measured by the inertial navigation system (ins)above the king pin of the measuring trolley, the current rate potenzmitteln car and using a sensor of angular displacement current wobbling angle measuring truck relative to the car body and also by means of sensors Buchs-rail measure the distance from the flanges of the respective wheels of the truck to the rail head. According to the received information calculate the current rates of rail lines. Values of horizontal irregularities of rail lines receive as a work base truck on the deviation of current courses of rail lines from the current average on the basis of truck courses of rail lines. Current radii of curvature of the rail lines is the quotient of the base truck to increment the course of the corners of the rail lines on the basis of the truck.

The invention relates to monitoring the condition of the railway track.

There is a method of measuring cantilever bending in the plan (straightening) from asymmetrical chord, which is measured for each rails amount of horizontal movement of the rail in three points (over 4.5 m and 17 m) with respect to the car body with optical sensors body-rail [1].

A known method of measuring the curvature of the path in terms of [], which is determined by the change of angle moving along the path of the chord length equal to the base of the carriage in a horizontal plane. The rotation angle equal to the azimuth (azimuth of the longitudinal axis of the body)measured Ann, minus the wobbling angle of the body, determined by differential horizontal movements of the opposite ends of the body relative to the rails, measured by the optical sensors of the rail-wheel drive.

Horizontal irregularities of the rail lines is fully characterized by the alignment and curvature of the path in the plan. The straightening of rail lines are short, the irregularities of the rail lines, defined as the deviation of the current provisions of rail lines from the middle (approximating) curves.

The disadvantages of these methods are: distortion Hardouin method of short horizontal irregularities (straightening); low accuracy of the measurement of the curvature of the short curves, such as turnouts, due to the fact that the chord length comparable to the length of the curve.

Consider in more detail the properties of chordates methods of measurement.

Assume that the chord length lx=a+b sliding their ends along the curve x(y) (see figure 1). A small amount of roughness compared to the chord length allows to represent the movement of the chord as the amount of rotation around the instantaneous center at small angles and translational movement et the center with speed γ in the y-direction. Output value bordovogo meter is the length of f(y) boom bending, spaced at a distance b from the end of the notochord (point 3 in figure 1). Input the influence of the roughness of the rail x(y), which can be written as harmonic functions x=x0cosωt.

It is known that the ordinates xipoints 1, 2 and 3, the curve associated with a boom length of her bending ratio

where

The expression (1) allows to obtain the transfer function bordovogo method. When exposed to harmonic irregularities having frequency ω and the amplitude of x0given the delay that is proportional to a constant speed of movement of the car ν, ordinates xi(i=1,2,3) are changed according to the law

Taking into account (1) and (2) boom length of the curve can be represented in the form

where

Thus, using the expression (3)can Hardaway measuring device to correlate the frequency transfer function

W(iω=rω)eiϕ(ω).

Because the bumps are easier to present as a function of the longitudinal coordinate of the way, let's move to the new independent variable, using the obvious relation y=νt. Then harmonic the Skye roughness takes the form

where λ - wavelength roughness. Note that the right side of expression (5) does not depend on the speed of the car.

If the input signal will be considered as moving x2measuring roller or measured by non-contact sensor distance from the chord to the rail, the transfer function bordovogo measuring device will be

where- spatial frequency roughness".

A dependency graph of module frequency transfer function r(λ), constructed in accordance with the expression (4) for the case ranapia chord (a=b, lx=2A, shown in figure 2. From the graph we see that the link method makes it possible to approximately reconstruct the shape of the bumps only on the condition that its length exceeds the length of the chord λ>A. When increasing the length of the uneven sensitivity of the method decreases significantly.

The proposal to use not only the angle but also the speed information generated by the Ann, was made Professor Speditionen. The resulting algorithm for determining the horizontal and vertical irregularities using the corners of the course and tilt of the carriage in the longitudinal plane (pitch) and the speed of the car. However, as rightly said by the author himself, "goniometric methods for the determination of the profile across the tsya methodical error associated with the mismatch between the tangent to the track line and the longitudinal axis of the car, which is, essentially, a chord length of 20 m. Indeed, the proposed method will skip the bumps having a length equal to the length of the chord, since it does not change the angular orientation of the car body, and will have all the disadvantages of Hardaway method.

Let us consider this situation in some detail in relation to the control of irregularities in the horizontal plane. For the transition from the angular position of the carriage to the unevenness of the rails sensors are used translational movements of fixed points of the body relative to the rails. Connecting the control points on the rail between them, get a line, which we will refer to measuring chord (figure 3). The angular deviation and offset measurement of the chord from the longitudinal axis of the body of the car shelter can be caused by the following reasons.

1. Bias truck from the axis of the gauge in the process of cross-section fluctuations or changing the gauge. This leads to a change in the distance δijbetween panel Jack and rail (i=1, 2 is the number of the measuring wheel pair; j=l, n is the index of the left and right wheels). Distance δijmeasured by non-contact displacement sensors optical or other type.

2. Turn the trucks around the king pin otnositel the body on the corners α 1and α2. In the distance values between the first and second carriages and the body is changed to

where a is the distance from the wheel axis to the transverse axis of the truck. Expression (7) is true for measuring the chord lx=l+2f, where l is the distance between the pins of the first and second trolleys.

3. The wobbling (yaw) of the car body on the spring suspension regarding books wheelset. If we assume that the fluctuations of the car on the corner of the yaw happen around its center of mass, it δB1=-δB2.

Thus, the total angular deviation measuring chord from the longitudinal axis of the car will be

The angular position of the measuring chord relative to the project and course angle Towards0

α=ψ+Δα,

where ψ - the yaw angle measured by the ins. The angle of the chord relative to the direction North is defined by the expression

αN=K+Δα,

where the heading angle ANT K=K0+ψ.

All included in the expression (8) the angular and linear displacements of the elements of the car must be measured by sensors included in the measurement system. Modern potenzmitteln cars, such as the German car OMWE, have such a set of sensors. Better yet, use ncont Kanye sensors, measuring directly the distance between the car body and the surface of the rail. After all the transformations again come to Hardaway method of measurement.

A direct transition from the angle measuring chord to coordinate and profile roughness way possible only in a fairly small range of long irregularities. Indeed, by analogy with the expression (2) we write for x1start and x2the end of the notochord

x1=x0cosωt,

The relationship between the coordinates of the ends of the chord and the angle of its rotation α set expression

x1-x2=lxtgα≈lxα

On the other hand,

where:- introduced higher repetition frequency waves irregularities.

The frequency transfer function (x1- the angle of rotation of α) bordovogo device takes the form

To obtain an inverse of a transfer function is necessary to know the magnitude of the translational displacements of the center of rotation of the chord. Comparing expressions (6) and (9), it is easy to see that the dependence r(λ) will have the same form as the graph presented in figure 2, if we replace the l xon the x-axis. Hence the fair and all the conclusions made above defects bordovogo method.

The objective of the invention is to develop beshanogo (single point) method of measurement the straightening of rail lines.

To solve the problem in the method of measuring horizontal irregularities (straightening) and curvature in terms of rail lines calculate the current rates of rail lines as the current rate of the body minus the current angle of nparalleled of wheels wheelset measuring truck and rail heads thread, then get the current values of horizontal irregularities (straightening) of rail lines as a work base truck or reject the current rate of rail lines from the current average on the basis of truck courses of rail lines, and current radii of curvature of the rail lines is the quotient of the base truck to increment the course of the corners of the rail lines on the basis of the truck.

The technical essence of the invention is explained as follows.

Under the straightening mean roughness of each of the rail lines in the horizontal plane relative to the average position of each thread.

The current rate of rail lines can be defined as

where KIns- the current rate of car body; γTKithe wobbling angle change is sustained fashion truck relative to the body; (hli-h2(i-n))/bTL- angle nparalleled of ribs of the left wheels of the trolley head of the left rail; (h3i-h4(i-n))/bTP- angle nparalleled of ribs right wheels of the trolley head right rail; hji- the distance from the j-th flange to the rail head; bTbase truck; n=bTML; where W λML- increment the odometer (distance sensor).

In other words, the current rate of the rails the same as the course truck virtual pressed against the flanges of the wheels to the rail head (at a depth of 15.7 mm below the running surface of rails).

Values of the current horizontal irregularities will have values

χL=bTΔKL; χP=bTΔC,

where- (deviations from the current rate of rail lines from the current average), and averaged on the basis of the current truck courses, characterizing the average position of rail lines (in azimuth)

Current radii of curvature are determined by the formula

Rl=btl; Rp=btC,

where δKl=Kl-KRL(i-n); δKC=KC-KRP(i-n).

More accurate current assessment of the Ki of the radii of curvature using an average current rate of rail lines, namely

where

as in (10) excluded the effect of short horizontal irregularities.

Despite the fact that Ann has a significant error (fraction of a degree) course angle measurement, the accuracy of determining the horizontal roughness and curvature in the plan will be high, as in the method used increments course angles, all components of which are measured with high accuracy and high resolution. Increment and course angle of the body can be measured by a laser gyro ins with an error of less angular seconds. Dvadtsatimetrovy optical sensor relative angular displacement, measuring the angle of the wobbling of the measuring bogie relative to the body, has an error at the level of the angular seconds.

Measurement error angle nparalleled of wheels wheelset measuring truck and rail heads of threads is determined by the errors of optical sensors Buchs-rail, which is no worse ±0,1 mm At the base of the truck bTequal to 2.4 m, it will be 17 seconds of arc. The total measurement error variance of the current courses of rail lines from the current average will be about 20 seconds of arc (RS 9.69·10-5rad). Then the measurement error of the horizontal n is ravesta will not exceed ± 0,25 mm

Thus, the proposed method allows to measure with high precision and without distortion wavelength horizontal irregularities of the rail lines that at small increment odometer will allow you to identify defects in the rail head. In addition, the proposed method allows high-precision measurement of the radii of curvature of short curves plots, such as turnout (because the length of the base of the truck about 7 times smaller than the base car).

Literature

1. Wagon-potenzmittel CRI-4. Technical description. EIMN t0. - M.: 1996.

A method of measuring horizontal irregularities (straightening) and curvature in terms of rail lines, which is measured by the inertial navigation system (ins), mounted over the pivot measuring trucks, the current rate of body potenzmitteln car and using a sensor of angular displacement current wobbling angle of the measuring bogie relative to the body, then with the help of sensors Buchs-rail measure the distance from the flanges of the respective wheels of the truck to the rails, characterized in that the measurement information calculated current rates of rail lines as the current rate of the body minus the current angle of the wobbling of the measuring bogie relative to the body minus the current angle of nparalleled the flanges of the wheel is ar measuring truck and heads of rail lines, then get the current values of horizontal irregularities of the rail lines as a work base truck on the deviation of current courses of rail lines from the current average on the basis of truck courses of rail lines, calculated from the rates of rail lines, and current radii of curvature of the rail lines is the quotient of the base truck on the measured increment of course angles of rail lines on the basis of the truck.



 

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Track gauge // 2245956

FIELD: railway transport; permanent way facilities.

SUBSTANCE: invention is designed for checking parameters of track. Proposed track gauge contains housing, device for measuring gauge width with movable and fixed stops to thrust against rail heads, rail level measuring device and device to measure ordinates and grooves of switches. Including vernier with stop to thrust against head of move-off rail or counterrail and interacting with digital indicators on gauge housing. Vernier is provided with additional stop to thrust against non-worn-out part of rail head. Rail side wear detector interacting with vernier is installed on gauge housing.

EFFECT: enlarged operating capabilities of track gauge, reduced errors in measurement.

2 cl, 3 dwg

FIELD: railway transport.

SUBSTANCE: method comes to measuring vertical and horizontal accelerations of meter body and those of left-hand and right-hand axle boxes of one of its wheelsets, determining values of measured accelerations and components of vertical accelerations of axle boxes for preset fixed running speed, and comparing obtained values with tolerable values and determining minimum value of maximum running speed of meter on particular section of rail track. Proposed device contains covered part transmitter, initial data packet shaper, accumulator, filter unit, operator's panel, acceleration meters, speed meter, board time system, scaling unit, path irregularities detector, wheel out-of-roundness detector, body vibration intensity detector, maximum speed meter and report date packet shaper. Group of inventions provides determination, with high accuracy and reliability, values of accelerations appearing in main members of meter-path system and obtaining complex characteristics of dynamic interaction of rail track and running train.

EFFECT: simple design of device, low cost.

3 cl, 2 dwg

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