The method of determination of the parameter characterizing the interaction in the system of wheel - rail, when the vehicle along a curved section of track

 

(57) Abstract:

Use: for determination of the parameter characterizing the interaction in the system of wheel-rail when the vehicle along a curved section of track. The inventive determine the length of the base of the truck, the rotation angles of the front and rear axles and frame the effort, which determine the interaction parameter system wheel-rail, which is used as the value of the power factor, proportional to the flange wear of tires wheelset. 2 Il.

The invention relates to railway transport, in particular to the control and recording devices to determine the status of the rolling stock and track, and is intended for use in scientific studies of processes of interaction of way and rolling stock, as well as estimates of expected flange wear of tyres wheelsets and rails in curves.

There is a method of determining a parameter characterizing the interaction in the system of wheel-rail when the vehicle along a curved section of track, namely, that determine the length of the base vehicle, half the length of the base of the truck and corners turning parts, all specifications the rail.

The disadvantage of this method is that the installed electric sensors provide electrical signals pulses are compared with a predefined gradation output aligned electron-amplitude selector, i.e., the received signals are compared with signals received at the installation path. Therefore, after comparing the signals obtained electrical signals reflecting the real force of the rolling stock on the railway path, not a relative or simulated.

In addition, the electrical signals received from sensors depending on the signal level of the electron-amplitude selector, served in a corresponding electromagnetic otsechki, retaining only your targets on paper. This system filtering of the signal and divide it up into strong and weak reflects the primitive processing of pulses, which eventually registers to extend the paper signals that reflect only changes in electrical impulses unsprung or sprung part of the crew, after the amplifier with unjustified and unnecessary expansions of the signal.

The known method also reflects the interaction of the crew on the way, vsego, technology process and recording of electrical signals with amplification and comparison with predetermined values of the pulses. It should be noted the lack of reliability associated with the use of electron-amplitude selector, which is not able to ensure the stable operation of the device. About the lack of accuracy of measurement by the fact that no mention of the position of the crew in the curve of the railroad tracks. Although, as is known, the motion of the crew in the curve sections of railway track dynamic interaction increase dramatically, and with increasing speed, their actions are amplified. Among other things, described the prototype reflects the way the registration of the power factors of dynamic interaction between the crew and the path, not the wear factor system wheel-rail, although it should be noted that the power factors are components of the wear factor.

The purpose of the invention improve the accuracy of the continuous determination of the wear of the rolling stock and the path curves in the plots.

The objective is achieved by the fact that in the proposed method, measure the length of the base vehicle, half the length of the base of the truck and the angles of the front and rear axles, frame force, prierowsee interaction in wheel-rail, use the value of the power factor, proportional to the flange wear of tires wheelset, which is determined by the ratio of:

< / BR>
where T is the magnitude of the friction force of the wheels on the rails;

L the length of the base of the vehicle;

and half the base length of the truck;

THEpframe force;

's half the distance between the circles Catania;

Cthe angle of rotation of the rear truck;

pthe angle of the front truck;

To the coefficient linking dimension.

In Fig. 1 shows the parameters used to calculate the factor of Fig.2 the device to implement the method.

Thus in Fig.1 mark:

Pole length;

W the center of rotation of the truck;

H1the longitudinal component of the friction of one wheel of the 1st pair of wheels on the rails;

H2the longitudinal component of the friction of one wheel of the second pair of wheels on the rails;

V1the transverse component of the friction of one wheel of the first pair of wheels on the rails;

V2the transverse component of the friction of one wheel of the second pair of wheels on the rails;

T the resultant of the frictional force of the wheels on the rails;

2A base truck;

THE1guiding force of the first wheel;

The method has the mathematical justification.

Consider the basic formula of wear, which reflects the following dependence.

f = MC,

where the power factor, proportional to the flange wear of tires wheelset;

The guiding force (reaction rail);

a corner of crowding;

To the coefficient linking dimension (g/kN/rad).

Perform an analytical calculation of the guides efforts.

Given the ratio (Fig.1) the transverse component of the friction forces V1to the resultant of forces of friction of the wheels on the rails T and the ratio of the pole distance X to the half length 2S, from the similarity of triangles will make a proportion:

< / BR>
< / BR>
From which we find the value of the transversal components of the friction forces for the first and second wheel pairs.

< / BR>
With regard to frame efforts INparising from the action of centrifugal forces and reactions rail, get:

< / BR>
It is known that the rotation angles of the front and rear axle relative to the vehicle is determined by the formula:

< / BR>
tgnn, tg33since the rotation angles do not exceed 5ovalues and identical for different installations of the crew in the curve,

wherenangle patwa;

and half of the base truck;

Xnthe pole distance of the first carriage;

X3the pole distance of the rear truck;

R is the radius of the curve.

Considering the position of the crew in the curve at the maximum transfer is assumed that the pole distance front and rear bogies are equal, i.e., X3XnH. Find X from the formula (7)

< / BR>
From the formula (8) determine the value:

< / BR>
Substituting (9) into (10) and simplifying, we get

< / BR>
From the expression (11) find the radius of the circular curve

< / BR>
Find pole distance to the rear of the truck

< / BR>
where the total gap taking into account the broadening of the gauge.

Substituting the expression (12) in (9), we get:

< / BR>
Given a formula to determine the lateral forces arising between wheel and rail,

< / BR>
where guides efforts when moving crew curve;

T the frictional force of the wheels on the rails;

Pole length;

's half the distance between the circles riding wheelset.

Supplying the expression (14) in (15), we obtain the values guiding efforts for the first and second wheelset

< / BR>
From the expression (13) find the value of the total gap taking into account the broadening of the line.

< / BR>
Substituting expression is=a(3-n);(20)< / BR>
The angle of crowding is determined by the formula /8/

< / BR>
Substituting the expression (13) in (21), we get:

< / BR>
Using (20) in the expression (22), we find:

< / BR>
Substituting the expression (12) in (23), we get:

< / BR>
According to formulas (16), (17) and (24) to obtain the values of the constituent power factor, proportional to the wear and tear, which depends on the magnitude of the rotation angles trucks , base vehicle L, half of the base of the bogie and frame efforts INphalf the distance between the circles S Catania and the resultant friction forces So Given the condition that the motion of the crew of the second wheel pair may take different positions, produced a mathematical calculation only for the rolling wheel pair, i.e., to determine directing efforts AT1.

F = MC (25)

A block diagram of a device that implements the method includes:

1 contactless sensor frame of effort;

2 non-contact angle sensor front truck;

3 non-contact angle sensor rear truck;

4, the signal processing unit guides the efforts that occur between the outer rail and a pair of wheels;

5, the signal processing unit of the node abeginner CLASS="ptx2">

The sensor frame of effort 1 is mounted on the frame of the truck and using a rod connected to the panel Jack wheel pair, generates an electrical signal proportional to the pressure of the bogie frame on the axle equipment wheelset. The sensors of the rotation angles of the front truck 2 (nand rear of the trolley 3 (3) relative to the axis of the frame of the vehicle, is placed directly on the frames of trucks and by means of kinematic connection connect to the frame of the vehicle, the sensors implement an electrical signal proportional to the rotation angle of the trucks.

Electrical signals proportional to the rotation angle of the front truckn, the angle of rotation of the rear truck3/ and frame efforts INpshall be received by the signal processing unit guides the efforts of the 4 acting on the wheel pair. An electrical signal reflecting the magnitude of directing the efforts of THE1supplied to the signal processing unit of the wear factor 6, in addition, block 6 receives electrical signals from the block 5, which implements the angle of crowding ridge brace of the pair of wheels on the rail in function of the rotation angles trucks vnand3. Unit 6 multiplies the magnitude of the electrical signals AT1and taking into account the coefficient linking shedding apparatus 7, and is characteristic of a dynamic interaction between rolling stock and the way Express the magnitude of the wear factor wheelset of the vehicle and the rails.

The method of determination of the parameter characterizing the interaction in wheel rail, when the vehicle along a curved section of track, namely, that determine the length of the base vehicle, half the length of the base of the truck and the rotation angles of the front and rear bogies, which calculates the parameter characterizing the interaction in wheel

rail, characterized in that the measuring frame force, determine the magnitude of the friction force of the wheels on the rails and the distance between the circles skating wheels, and as the parameter characterizing the interaction in wheel rail, use the value of the power factor, proportional to the flange wear of tires wheelset, which is determined by the ratio

< / BR>
where T is the magnitude of the friction force of the wheels on the rails;

L the length of the base of the vehicle;

a half length base truck;

THEpframe force;

's half the distance between the circles Catania;

C- the angle of rotation of the rear truck;

p- the angle of rotation of the front truck;

To the coefficient linking dimension.

 

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