A device for determining irregularities on the surface of the rail

 

(57) Abstract:

Usage: railway transport, namely carriages and track measurement devices for monitoring and identifying irregularities on the surface of the rail. The inventive device for determining irregularities on the surface of the rail contains two accelerometer attached to buxom one pair of car-potenzmittel, delay lines, the switch analog signals, the sensor turns the wheel, digital speed gauge, decoders codes, switch digital signals, two-input logic element OR pulse counter, two blocks of double integration, and unit detect the trajectory of the wheel on the rail head, the memory multiplier and a digital signal. In the device entered the magnitude of the acceleration is proportional to the speed of the wheel on the rail head, which being multiplied by constant values recorded in the memory cells arrive at the input of the integration is invariant to speed. 6 Il.

The invention relates to railway transport and can be used to identify irregularities on the running surface of the rails.

Known useplanning to buxom one pair of car potenzmitel, switch analog signals, the sensor turns the wheels connected to the digital speedometer, the output of which is connected a decoder codes, and two blocks of double integration, the outputs of which are connected with the inputs of the block defining the trajectory of the wheel on the rail head.

In the known device the sampling frequency of the analog signals of the acceleration is constant and is determined by maximum permissible speed of the wheel rolling on the rail. For large values of permissible speed of the wheel rolling on the rail, the sampling frequency can reach significant values, which leads to redundancy of information in m times at low speeds of the wheel rolling on the rail and, as a consequence, the performance of the known device as a whole.

To ensure the conditions of invariance of the calculated values of vertical acceleration to the speed of the wheel rolling on the rail in the known device used blocks of double integration, which have different transmission characteristics, taking into account the speed of the wheel rolling on the rail. The number of blocks of double integration 12-i, 13-i, having individual transfer characteristics, related to the values of m, the complexity of the known device is considerably increased.

The purpose of the invention increase productivity while simplifying the structure of the device.

This is achieved in that in a device for determining irregularities on the surface of the rail containing two accelerometer attached to buxom one pair of car-potenzmittel, switch, analog signals, the sensor turns the wheels connected to the digital speedometer, the output of which is connected a decoder codes, and two blocks of double integration, the outputs of which are connected with the inputs of the block defining the trajectory of the wheel on the rail head, inputs of m memory cells, the switch to digital signals, connected in series with the element OR the counter and additional codes decoder, delay line and serially connected analog-to-digital - to-howl Converter, the multiplier digital signals and the multiplexer digital signal outputs connected to the inputs of two blocks of integration, and managing input to an output of the second decoder codes, additionally connected with the control input of the switch analog signals, the functional inputs of which are connected through one and the other delay lines with one and the other sensor is th input is through a third delay line coupled to the output element OR one and the other inputs of which are connected, respectively, directly and through the fourth delay line with rpm sensor wheel. Each of the information inputs of switch digital signals connected to the corresponding i-th memory cell, the control input with the output of the first decoder codes that are output to the second input of the multiplier digital signals. Each stage of the first and second blocks of double integration includes shift registers, the control inputs of which are respectively connected through the fifth and consistently connected fourth and sixth delay line with rpm sensor wheel, and connected to the outputs of registers via the optional digital multipliers adder.

In Fig.1 shows a block diagram of the device of Fig.2 a block circuit diagram of double integration; Fig.3 a block circuit diagram of the determination of the trajectory of the wheels on one rail of Fig.4 and 5 implementation scheme switch analog signal multiplexer digital signals and switch to digital signals, and Fig.6 hodograph distribution of force F, velocity V and acceleration a, acting on the wheel when driving on the rail head.

A device for determining irregularities on the surface of the I, six lines 3-8 delay, the switch 9 analog signals, the input of which is through lines 3 and 4 delays connected with sensors 1 and 2 accelerations, and the output is connected to one of inputs of analog-to-digital Converter 10, the output of which is connected to one input of the multiplexer 11 digital signals. Two-element OR 12 with its output connected to the second input of the analog-to-digital Converter 10 and the input of the counter 13 pulses. The device has two decoder 14 and 15 codes, the sensor 16 of wheel revolutions, its output connected to the input digital speedometer 17, the output of which is connected to the decoder 14 codes. Included in the device multiplier 18 digital signals its input connected to the output of analog-to-digital Converter 10. The output of the multiplier is connected to the functional input of the multiplexer 11 digital signals, the outputs of which are connected with the inputs of the blocks 19 and 20 double integration.

Unit 21 to detect the trajectory of the wheel on the rail head (hereinafter, the unit determining the trajectory of its inputs connected to the outputs of the blocks 19 and 20 double integration. The newly introduced into the device m of the cell memory 22 are connected with the inputs of the switch 23 digital signals, the output of which is s contains the first block 24 of integration, which includes m registers 25 shift, m-1 multipliers 26 digital signals, the inputs of which are connected to the outputs of the above-mentioned registers 25 of the shift. The outputs of the multipliers 26 are connected with the inputs of the multi-input adder 27, the output of which is the functional input of the second block 28 of integration is identical to the block 24 of integration. The second input unit 28 of integration is connected with the output of the sensor 16 of wheel revolutions through the delay line 8, the output of block 28 of integration is the output of the block 19 or 20 double integration.

Unit 21 to detect the trajectory of the wheel on the rail head contains four multiplier 29-32 digital signals, two two-input adder 33 and 34 and two cells 35 and 36 of the memory. The first inputs of the multipliers 29 and 31 connected to the output unit 19 double integration, the second input of the multiplier 29 is connected to the output of memory cell 35, and the second input of the multiplier 31 and a cell output memory 36.

The output of the multiplier 29 is connected to the first input of two-input adder 33, the output of multiplier 31 to the first input of two-input adder 34, and the first inputs of the multipliers 30 and 32 connected to the output of block 20 double integration. The second input of the multiplier 30 is connected to the cell output 35 pambo adder 34, and the output of multiplier 32 with the second input of two-input adder 33. The outputs of the adders 33 and 34 are output.

The switch 23 digital signal contains the mn-bit switches 37, m functional inputs connected to the outputs of the m cell memory 22, and the control inputs of the n-bit switches 37 to m outputs of decoder 14. Outputs n-bit switch 37 connected together and connected to the second input of the multiplier digital signals 18. Each of the n-bit switches 37 consists of n keys 38, the functional inputs of which are connected to the outputs of the respective n-bit cell memory 22, and control inputs connected together and connected to the corresponding output of the decoder 14. The outputs of the keys 38 of the i-th n-bit switch 37 is combined with the corresponding outputs of the remaining n-bit switches 37.

The device operates as follows.

When rolling a pair of wheels, the wheels which do not have irregularities on the surface, the irregularities on the rail sensors 1 and 2 accelerations enshrined dont forget a pair of wheels with a vertical orientation of the axis of sensitivity, produce an electrical signal proportional to occur vertical speed of the wheel rolling on the rail. This sequence of pulses through the delay line 5 and the two-input logical OR element 12 is supplied to the counting input of the counter 13, the output of which is a binary code input to the decoder 15. The decoder 15 generates a control signal on the control input of analog switch 9 through a line 6 delay input "Starting ADC" analog-to-digital Converter 10 and the control input of the digital multiplexer 11. Depending on the state of the counter 13, the decoder 15 generates a control signal by which the analog switch 9 in turn connects to the input of analog-to-digital Converter 10, the signals from the acceleration sensors 1 and 2, starts with a delay conversion to analog-to-digital Converter 10, and is connected using a digital multiplexer 11, the output of multiplier 18 digital signals to the inputs of corresponding blocks 19 and 20 double integration. At the same time the sequence of pulses from the sensor 16 of wheel revolutions is input to the digital speedometer 17, which at its output generates code that depends on the speed of the rolling wheel. Output digital speedometer code 17 is input to decoder 14, which generates the control signal for commute is noites 18 digital signal output corresponding cell memory 22, the stored code, the value of which corresponds to the correction factor transfer characteristics of the blocks 19 and 20 double integration in this speed range, rolling wheels, what is required for compliance with the conditions of invariance calculation of displacements of the wheel vertical accelerations to the speed of the wheel rolling on the rail. In addition, the sequence of pulses from the sensor 16 of wheel revolutions through lines 7 and 8 of the delay is fed to the control inputs of shift registers integrators blocks 19 and 20 double integration. From the output of analog-to-digital Converter 10 code corresponding to the acceleration signal of the currently connected sensor acceleration is applied to the first input of the multiplier 18 digital signals, which performs the correction data by multiplying the coefficients stored in the cell memory 22 and which uniquely correspond to the respective sub-bands in the range of permissible speed of the wheel rolling on the rail. From the output of the multiplier 18 digital code signals received at the input of digital multiplexer 11, which gives it to the inputs of corresponding blocks 19 and 20 double integration. In blocks 19 and 20 double integration going on the th in digital form vertical displacements of the wheels rolling it over bumps on the head rail. Outputs of blocks 19 and 20 double integration codes corresponding to vertical movement of axle equipment wheelset, served on the block 21 determine the trajectory, which implements the algorithm for solving the system of two algebraic equations. This block determine the trajectories allows to eliminate the influence of vertical displacement of axle equipment. The outputs of the block 21 are the outputs of the device. Each sensor 1 and 2 accelerations captures the total component accelerations from two wheels. To separate the components of the accelerations in the device entered the block determine the trajectories of the motion of the wheel irregularities in the rail head, which implements the function of solving a system of two equations with two unknowns.

The sensor 16 of wheel revolutions is set to frequency quantization.

If we assume that for a full revolution of the wheel for 1 sec sensor 16 turns of the wheel will generate a sequence of pulses with a frequency fowhen the speed increases by m times the rpm sensor wheel will generate a sequence of pulses with a frequency m fo. The time of passage of the roughness length l of the wheel decreases in m times.

Therefore, at any speed the passage to the ranks m, determined only by the value of fothe greatest frequency harmonic in the spectrum of the input signal. I.e., in the proposed device, enter only the necessary amount of information to determine the trajectory of a malfunction, do not depend on the speed of the wheel. Hence, the performance of the proposed device in m times higher than the prototype.

The trajectory Z(l), where l is the coordinate describing the x-axis), the motion of the irregularities of the rail head is described by the equation:

Z(l)Vn(l-h) l

V(n)an(n-h)n

n, l value, is inversely proportional to the magnitude and having the dimension of length,

Vn(l), an(l) respectively vertical components of velocity and acceleration of the movement of the wheel along the rail head;

N limit of integration, having the dimension of length.

In the device function Z(l) is implemented at the output of blocks 19 and 20 double integration (unit 19 for determining the trajectory of the wheels on one rail, the block 20 on the other).

In Fig. 6 shows a vector diagram acting on the wheel during the movement of forces F, FnFl, velocities V, VnVl, accelerations a, an, al(n, l signs respectively vertical is La F, acting on the wheel from irregularities and therefore the greater the vertical component of anthe acceleration measured by the acceleration sensor on the wheel of the truck.

In a device for determining irregularities on the surface of the rail entered the magnitude of the acceleration is proportional to the speed of its movement along the rail head. The multiplier 18 and m memory cells 22, where the recorded values of the constants allow the magnitude of the acceleration input to the input blocks of integration, to make invariant to speed. When the values of the constants inversely proportional to the speeds of the wheels on the rail head, the problem of invariance (independence) from the velocity of the incoming information in blocks 19 and 20 double integration will be solved.

The device for determination of the roughness on the surface of the rail can be successfully applied in train track measurement serving one of the main diagnostic tools the ways in which they identify a path failure, set the priority and timing of track works on elimination of the revealed faults of the way.

A DEVICE FOR DETERMINING IRREGULARITIES ON the SURFACE of the RAIL, Sadeh signals, the rpm sensor wheel connected to the digital speedometer, the output of which is connected a decoder codes, and two blocks of double integration, the outputs of which are connected with inputs of the block defining the trajectory of the wheel on the rail head, characterized in that it introduced the m memory cells, the switch to digital signals, connected in series with the element OR the counter and additional codes decoder, a delay line and serially connected analog-to-digital Converter, a digital multiplier signal and the multiplexer digital signal outputs connected to the inputs of two blocks of integration, and managing input-output of the second decoder codes additionally connected with the control input of the switch analog signals, the functional inputs of which are connected through one and the other delay lines with one and the other acceleration sensors, respectively, and the output from the functional input of the analog-to-digital Converter, the control input of which is through a third delay line coupled to the output element or, one and the other inputs of which are connected, respectively, directly and through the fourth delay line with rpm sensor to what cacoy memory the control input with the output of the first decoder codes output from the second input of the multiplier digital signals, and each stage of the first and second blocks of double integration includes shift registers, the control inputs of which are respectively connected through the fifth and consistently connected fourth and sixth delay line with rpm sensor wheel, and connected to the outputs of registers via the optional digital multipliers adder.

 

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