JPH054609B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a rail wavy wear detection device that continuously measures wavy wear on the upper surface of a rail while traveling on the rails of a railway track. be.

[Prior Art] The upper surface of the rail (the upper surface of the rail head) of a railway track has wavy irregularities in the length direction due to friction between the rail and the wheels of vehicles running on the rail. Wear occurs. As this wave-like wear progresses, it causes severe vibrations and shocks to vehicles, tracks, and roadbeds, worsening passenger ride comfort, prompting damage to tracks and roadbeds, and generating noise, causing noise pollution along railway lines. causing inconvenience such as causing

For this reason, conventional methods have been to measure the wavy wear, etc. that occur on the top surface of the rail, and to correct the contour of the rail head by removing the wavy wear or displaced layer on the rail head, if necessary. There is. In this case, considerable precision and accuracy are required to measure the wavy wear etc. that occur on the upper surface of the rail.

As mentioned above, conventional devices for detecting the wave-like wear that occurs on the top surface of the rail are those that measure the wear using a single measuring device installed on the vehicle (for example, Japanese Patent Laid-Open No. 51
-114151, Japanese Patent Application Laid-open No. 52-75459), if the inspection vehicle equipped with the inspection device moves up and down due to irregularities on the top surface of the rail, eccentricity of the wheels, etc., the above-mentioned inspection The instrument also moves up and down, causing a large measurement error.

Therefore, in order to minimize the measurement error caused by the vertical displacement movement of the inspection vehicle, the present applicant has installed two measuring instruments for measuring irregularities on the top surface of the rail at regular intervals in the length direction of the rail. They are installed side by side and run by an inspection trolley, while both inspection instruments measure the irregularities on the top surface of the rail, and a difference calculator calculates the difference between the two measurement values. By dividing the interval into a number of equal parts, dividing the difference by the equal number, and sequentially adding the divided difference values for each of the equal distances using a summation calculator,
The amount of unevenness (that is, the amount of displacement in the vertical direction) on the top surface of the rail is determined based on the measurement starting point, and thereby the wave-like wear on the top surface of the rail is detected. A patent application has already been filed for a method and device for measuring rail wave wear using this differential method (Japanese Patent Application No. 75275/1982).

That is, as shown in Fig. 5, two measuring instruments A and B located at two points on the upper surface of the rail 1 at the starting position of the inspection divide the interval l into equal parts C (in the case of the figure, it is divided into two equal parts). ), and the measured values of the measuring device A at each point between the initial position and the position moved in the direction of the arrow by the above-mentioned equal distance l/C are A _c , A _c+1 , A _c+2 , A _c+3 , A _c+o ,
Let the measured values of measuring device B be B ₀ , B ₁ , B ₂ , ...B _o ,
Further, points P ₁ , P ₂ , P ₃ , _... rail 1 at P o moved from the starting point P ₀ at the pitch of the equal distance l/C
The amount of vertical displacement of the top surface with respect to the starting point P ₀ is
Assuming that β ₀ , β ₁ , β ₂ , ...β _o-1 , β _o respectively, the following relational expression holds true.

β _p = 1/C _o 〓 ^p=0 [A _c+p −B _p ] (p=0, 1, 2, 3...
…n) Here, Δβ _p = [A _c+p −B _p ]/C (p=0, 1, 2,,
3...n), then β _p = _o 〓 ^p=0 [Δβ _p ] (p=0, 1, 2, 3...
n) As is clear from the above relational expression, while finding the difference between the measurement values at two points on the top surface of the rail 1 measured by the two inspection instruments A and B, Divide the interval l of B into several equal parts, divide the difference between the two measurement values by the equal fraction C, and divide the two measuring instruments A,
Each time B moves by the above-mentioned equal distance, the divided difference value Δβ _p (p=0, 1,
2, 3...n), rail 1
The amount of vertical displacement β ₀ , β ₁ , β ₂ , β ₃ , etc. with respect to the measurement starting point P ₀ at each point on the upper surface of the above-mentioned equal distances.
... β _o can be determined, and unevenness due to wavy wear can be detected.

Then, as mentioned above, two measuring instruments are placed on the measuring cart at a constant interval l in the length direction of the rail, and the difference between the measured values by both measuring instruments, that is, the amount of displacement in the vertical direction, is measured. (amount of unevenness), the front and rear wheels will fluctuate in the vertical direction from the standard position parallel to the top surface of the rail due to the unevenness of the top surface of the rail head, etc.
As a result, when the two measuring instruments are displaced vertically, the measurement error of each measuring instrument is quite large; however,
As mentioned above, in order to calculate the difference between the two measured values, the measurement errors of both are also subtracted, so the actual measurement error due to the displacement of the test cart is very small compared to the conventional one. Become something.

[Problems to be Solved by the Invention] By the way, as mentioned above, the amount of displacement in the vertical direction with respect to the measurement starting point can be calculated by sequentially adding the differences between the values measured by the two measuring instruments at regular intervals. If you ask for
Due to the relationship between the actual wavelength of wave-like wear on the rail-like surface and the measurement wavelength, the amplitude measurement error becomes large for a certain measurement wavelength.

In other words, assuming that the wave-like wear fx on the top surface of the rail is a cos function, fx = cosθ Also, as mentioned above, the difference between the measured values from the two measuring instruments is sequentially added, and the amount of vertical displacement with respect to the measurement starting point is calculated. When calculating the wavy wear measurement value f′X, f′x=1/C _o 〓 ^p=0 [A _p+2 −B _p ] (p=0, 1, 2, 3
...n), and as shown in FIG. 6, the maximum measurement error F of the amplitude of the wave-like wear measurement value is F=fx max - f'x max.

As for the measurement error F of the measured value due to the difference, as shown in the chart in Figure 7, the experimental results show that when measurement is started from the point with the largest error for the same wavelength, a and the point with the smallest error are If measurement is started from point b, the error will vary slightly depending on the difference in the measurement starting point, but the measurement error F can be approximately expressed as a function of measurement wavelength/sensor, and the sensor or detection If the instrument spacing and measurement speed are constant, the measurement error F is determined by the measurement wavelength.

As is clear from this chart, if the wavelength of the wavy wear is long enough with respect to the sensor spacing, there will be very little measurement error regarding the amplitude. When the ratio is 4 or less, that is, the wavelength of the wave-like wear is 4 times or less as compared to the sensor interval, the measurement error cannot be ignored.
If this is ignored, highly accurate measurements will not be possible.

Therefore, the present invention provides the above-mentioned method in the case where two measuring instruments are arranged and the wear is measured by the amount of displacement in the vertical direction with respect to the starting point of the inspection on the top surface of the rail based on the difference between the two measured values. The present invention aims to provide a rail wavy wear measurement device that can perform more accurate measurements by correcting amplitude measurement errors due to differences in the amplitude.

[Means for Solving the Problems] The present invention provides inspection carts 2 that are arranged at regular intervals in the length direction of the rails on inspection carts 2 that can run on rails 1 of a track, and that measure irregularities on the upper surface of the rails. The two measuring instruments A and B measure according to the distance from the reference position on the trolley side, and the measuring trolley 2 divides the interval between the two measuring instruments A and B or the interval into several equal parts. A travel detector 6 outputs a pulse every time the travel distance is traveled.
Then, input the measured values output from the two measuring instruments A and B, and perform a calculation to subtract the measured value of one from the other and calculate the difference between the two measured values, or A difference calculator 14 that performs an operation of subtracting the measured value and dividing it by the equal fraction; and a summation operation that sequentially adds the output values from the difference operator 14 each time the traveling detector 6 outputs a pulse. The inspection cart is equipped with a summation calculator 16 that sequentially calculates the amount of vertical displacement of the top surface of the rail with respect to the measurement starting point at each point for each distance where the pulse is output, and outputs the calculation result. In a rail wavy wear detection device that detects wavy wear based on the amount of vertical displacement based on the measurement starting point on the top surface of the rail at each point at each point where the measuring instrument moves or a distance divided into several equal parts. In order to solve the above problems, the following configuration was adopted.

In the present invention, as described above, the calculated value output from the summation calculator 16 includes the measurement error F shown in FIG. Considering that it is determined by the measurement wavelength ratio of
It has been established.

That is, the first invention includes a low-pass filter 19 which has a cut-off characteristic set according to the frequency in the necessary measurement range and which passes the output signal of the displacement amount outputted from the summation calculator 16 in an analog quantity. , a frequency characteristic that outputs a correction amount for the error determined by the measurement wavelength ratio of the wave-like wear to the measuring instrument interval with respect to the input including the measurement error of the displacement amount that has passed through the low-pass filter 19. A filter 20 with a signal passing through the filter 20 and the low-pass filter 19
an addition calculation unit 21 that adds the signal containing the error that has passed through the addition calculation unit 21; and a high-pass filter 22 that has a cutoff characteristic set according to the frequency in the required measurement range and passes the output signal from the addition calculation unit 21. The present invention is characterized in that it is provided with an error correction section 18 having the following.

The second invention provides a low-pass filter 1 which has a cut-off characteristic set according to the frequency in the necessary measurement range and which passes the output signal of the displacement amount outputted from the summation calculator 16 in an analog quantity.
9', a circuit 25 that generates an amplification factor adjustment signal in accordance with the signal including the measurement error of the displacement amount that has passed through the low-pass filter 19', and a circuit 25 that inputs the signal that has passed the low-pass filter 19' and includes the error. At the same time, a variable amplification amplifier 26 adjusts and amplifies the amplification factor by the amplification factor adjustment signal from the circuit to an amplification factor that includes a correction for the error determined by the measurement wavelength ratio of the wave-like wear to the measuring instrument interval.
and a high-pass filter 22' which has a cut-off characteristic set according to the frequency in the necessary measurement range and passes the output signal of the amplifier.

[Function] According to the wave-like wear inspection device of the present invention having the above-mentioned configuration, the inspection cart 2 runs on the rail 1 at a predetermined speed, and the two inspection instruments A and B equipped thereon run on the rail 1 at a prescribed speed. When unevenness due to wavy wear on the top surface of the rail is measured, both measured values are input to the difference calculator 14, and in this difference calculator 14, the two
Calculation of the difference between the measured values of both measuring instruments A and B, or the calculation of the difference between the measured values of both measuring instruments A and B.
An operation is performed to divide the interval l by an equal fraction C, which divides the interval l into equal parts, and outputs the result.

On the other hand, each time the inspection trolley 2 travels the distance l between the inspection instruments A and B or a distance equally divided by the number, the travel detector 6 outputs a travel pulse, and by the output of this pulse, a travel pulse is output. The difference calculator 1
The output value from 4 is input to the summation calculator 16.
In this summation calculation unit 16, the difference calculation unit 14
The output values are sequentially added and the total sum is calculated, and the amount of displacement in the vertical direction with respect to the measurement starting point on the top surface of the rail at each position where the pulse is output is sequentially determined, and the calculated value is output.

Therefore, as described above, the calculated value of the displacement amount outputted from the summation calculator 16 is a value smaller than the actual wave-like wear by the measurement error F. In this case, error correction is performed as follows.

The signal of the calculated displacement amount output from the summation calculator 16 has a pass band set according to the wavelength (frequency) of the required measurement range, that is, a cut-off characteristic that filters out the frequency of the wave-like wear detection range. The passing signal, which passes through the low-pass filter 19 and includes the measurement error described above, is input to the addition calculator 21 as is. On the other hand, in response to the input of the signal containing the error, the signal that has passed through the filter 20 which has a frequency characteristic that outputs the correction amount of the error determined by the measurement wavelength of the wave-like wear is also sent to the addition calculator 21.
In this addition calculator 21, the output signal corresponding to the error correction amount that has passed through the filter 20 and the signal containing the error are added and output.

That is, although the signal passed through the low-pass filter 19 is smaller by the amount of the error as described above, the signal passed through the filter 20 whose frequency characteristics have an output corresponding to this error is added to correct the error difference.

and a high-pass filter 22 with a pass band set according to the wavelength (frequency) of the range required for inspection.
is passed through and output. The measured difference in this output value is corrected according to the wavelength of the wavy wear, resulting in an output that approximates the actual wavy wear.

Further, in the case of the second invention, the summation calculator 1
The calculated value, that is, the displacement signal output from 6, is
Similarly to the above, the light passes through a low-pass filter 19' having a cutoff characteristic set according to the wavelength (frequency) in the range required for measurement. The passing signal containing the measurement error is input as is to the variable amplification amplifier 26 and amplified. In this amplifier 26, the signal from the circuit 25 that generates the amplification adjustment signal according to the signal containing the error is input to the variable amplification amplifier 26 and amplified. The signal is amplified with an amplification factor adjusted to include a correction for said error determined by the measurement wavelength, ie the error is corrected. The output from this amplifier 26 passes through the high-pass filter 22' in the same way as above and is output, and this output value is a value with the measurement error corrected as described above according to the wavelength of the wavy wear. becomes.

Therefore, according to the above-mentioned apparatus of the present invention, the difference between the values measured by the two measuring instruments A and B is sequentially added for each measurement point to calculate the amount of displacement in the vertical direction with respect to the measurement starting point. The wavy wear on the top surface of the rail can be measured with high precision using the differential method.

[Example] Hereinafter, one example of the present invention will be described based on the drawings.

FIG. 1 is a block diagram showing one embodiment of the wavy wear measuring device of the present invention, and FIG. 2 is a side view of the measuring section thereof. As shown in FIG.
It is arranged on the inspection trolley 2 at approximately the midpoint between the front wheel 3 and the rear wheel 4 of the rail 1 at a constant interval l distributed in the length direction of the rail 1, and Measure the unevenness of the top surface of the rail based on the distance.

These measuring instruments A and B are an optical sensor that uses light, a capacitive sensor that detects the capacitance of the gap with the rail, or a coil in the sensor head that generates a magnetic field and uses electromagnetic induction to detect the rail. A non-contact type detector such as a magnetic sensor that detects the inductance loss of the coil caused by an induced current flowing through the rail, or a potentiometer or differential that converts the amount of vertical displacement of the slide shaft in contact with the rail into voltage or current. A contact-type measuring device such as a sensor using a transformer or the like is used.

The inspection trolley 2 can run on the rail 1 with front and rear wheels 3 and 4, and is connected to a working vehicle (not shown) such as a rail head removal vehicle via a hydraulic cylinder 5 for setting and storing. During work, the hydraulic cylinder 5 lowers the work vehicle onto the rail 1 and sets it in a work state, and the work vehicle travels on the rail 1 together with the work vehicle.When forwarding, the work vehicle is pulled up from the rail 1 and stored within the vehicle limit.

The inspection truck 2 is attached to the axle end of the rear wheel 4 of the inspection truck 2.
A traveling detector 6 is provided which outputs a traveling pulse every time the vehicle travels a certain distance.
A device is used that divides the distance l between the measuring devices A and B into C equal parts and emits a pulse every time the measuring devices travel by the equal distance. For example, as shown in FIG.
A device that generates a pulse for each equally divided distance is used.

The above-mentioned measuring instruments A, B, traveling detector 6, etc. constitute a measuring section 7 of the wear measuring device shown in FIG.

In FIG. 1, a calculation section 11 is provided in a working vehicle or an inspection cart 2, and receives each measurement value outputted from two inspection instruments A and B of an inspection section 7 by linearizers 12a and 12b, respectively. The linearity is corrected, disturbances such as noise having a frequency higher than a predetermined frequency are removed by low-pass filters 13a and 13b, and the difference is calculated by subtracting one measured value from the other. A difference calculator 14 divides the interval l between the detectors A and B into C equal parts and divides the difference by the equal fraction C, and a running pulse output from the running detector 6 and whose waveform is shaped by the one-shot circuit 15. The gate is opened every time , and the divided difference value output from the difference calculator 14 is input to the summation calculator 16.The inputted values are sequentially added and the sum is calculated. It has a summation calculator 16 that sequentially outputs the amount of unevenness, that is, the amount of vertical displacement based on the measurement starting point on the top surface of the rail 1 at the position where the pulse is output.

An error correction section 18 is provided downstream of the calculation section 11 to correct the measurement error of the displacement amount outputted from the summation calculation section 16.

The error correction section 18 includes a low-pass filter 19 that has a cutoff characteristic set according to the frequency in the necessary measurement range and that passes the calculated value signal of the displacement amount output from the summation calculator 16;
The seventh signal that has passed through the low-pass filter 19
A filter 20, such as a high-pass filter, has a frequency characteristic that outputs a correction amount for the error determined by the measurement wavelength of the wave-like wear with respect to the measuring instrument interval in response to an input including the measurement error F shown in the figure. , an addition calculator 21 that adds the signal that has passed through this filter 20 and the signal that has passed through the low-pass filter 19 that includes the error; The high-pass filter 22 passes the output signal from the filter 21. The output signal that has passed through the error correction section 18 is sent to a recorder (not shown) and recorded. The filter 20 that outputs the error correction amount can utilize the frequency characteristics of the rising portion of a bandpass filter in addition to the characteristics of the rising portion of the high-pass filter.

Next, a case will be described in which rail wear is measured using the above-mentioned wear measuring device, particularly by dividing the interval l between the two testers A and B into two equal parts.

The inspection trolley 2 travels on the rail 1 at a predetermined speed via the work vehicle, and the rail 1 is inspected by the inspection instruments A and B.
When unevenness due to wavy wear on the upper surface is measured, the measured values are measured by the linearizers 12a and 12b, respectively.
The signal is input to the difference calculator 14 via the low-pass filters 13a and 13b, and the difference is calculated, and at the same time, it is divided by an equal fraction 2 that divides the interval l between the two measuring instruments A and B into two.

On the other hand, each time the inspection cart 2 travels a distance l/2, which is equal to the distance l between the inspection instruments A and B, for example, it is divided into two, it outputs a running pulse, and this pulse is waveform-shaped by the one-shot circuit 15. gate circuit 17
is input to open the gate, and the difference calculator 14
The divided difference value Δβ _p = [A _p+2 −
B _p ]/2 (p=0, 1, 2, 3...n) is input to the summation calculator 16. The summation calculator 16 sequentially adds the input values Δβ _p and calculates the sum, that is, β _p = _o 〓 ^p=0 [Δβ _p ] (p=0, 1,
2, 3...n) are performed, and the travel detector 6 travels in the direction of the arrow from the measurement starting point _P0 and outputs travel pulses at each point _P1 , _P2 , _P3 ...for each _P0 . The vertical displacement amounts β ₀ , β ₁ , β ₂ , . . . β _o of the top surface of the rail with respect to the measurement starting point P ₀ are sequentially output.

As mentioned above, the summation calculator 1 in the calculation unit 11
The signal of the calculated value of the displacement amount output from 6 is
The signal passes through a low-pass filter 19 having a cut-off characteristic that filters out frequencies in a pass band set according to the range required for measurement, that is, the wave-like wear measurement range.
This passing signal D contains a measurement error F with respect to actual wave-like wear in its short wavelength component region, but the signal containing this measurement error is input to the addition calculator 21, and at the same time, the measurement error The signal E that has passed through a filter 20 such as a high-pass filter that has the characteristic of outputting the error correction amount for the input signal D including and the signal E corresponding to the correction amount are added, and the measurement error is corrected and output.

That is, as shown in FIG. 3, when the output D from the summation calculator 16 is filtered by the low-pass filter 19 to filter wavelength components in the range required for measurement according to its cut-off characteristic d, the passed signal has an error component as described above. The frequency characteristic e is set to have an output E corresponding to this error F′, although it is less by F′.
The error is corrected by the filter 20.

Further, the output signal from the adder 21 is passed through a high-pass filter 22 having a cut-off characteristic g set according to the frequency range required for measurement, and this output value is determined by the wavelength of the wave-like wear. The error is corrected, resulting in an output that approximates the actual wave-like wear, and this output value is recorded.

In the above, a low-pass filter 19 and a high-pass filter 2 filter frequencies in the range required for measurement.
2, and a filter 20 that outputs the error correction amount.
However, if the frequency characteristics can be varied by the voltage obtained by F/V converting the speed signal from the running detector 6, as shown by the chain line in Figure 1, the above-mentioned changes will occur depending on the running speed. The amount of error correction can be controlled, and more accurate and highly accurate measurements can be performed.

FIG. 4 shows another example of the configuration of the error correction unit 18, which has a cutoff characteristic set according to the frequency in the necessary measurement range and which outputs a calculated value signal of the displacement amount output from the summation calculator. A low-pass filter 19' passes the analog quantity, and a waveform shaper 23 and F/
A circuit 25 converts the frequency of the wave-like wear into a voltage via a V converter 24 and generates an amplification factor adjustment signal according to the signal containing the error, and a circuit 25 that converts the frequency of the wave-like wear into a voltage and generates an amplification factor adjustment signal according to the signal containing the error, and the signal containing the error that has passed through the low-pass filter 19'. a variable amplification type that is adjusted and amplified by an amplification factor adjustment signal from the circuit 25 to an amplification factor that includes a correction amount for the error determined by the measurement wavelength ratio of the wave-like wear to the detector interval; amplifier 26
and a high-pass filter 22' which has a cut-off characteristic set according to the frequency in the range required for measurement and which passes the output signal of the amplifier 26.

In this case as well, the pass signal containing the measurement error that is output from the summation unit 16 of the arithmetic unit 11 and passes through the low-pass filter 19' is input to the variable amplification amplifier 26, which eliminates the error. A signal from the circuit 25 that generates an amplification factor adjustment signal corresponding to the signal included in the signal is amplified with an amplification factor adjusted to include the correction of the error, and is output after passing through the high-pass filter 22'. This output value is a value obtained by correcting the wavelength error of the wave-like wear in the same manner as above.

In addition, in the above embodiment, two measuring instruments A and B are used.
The case is shown in which the interval is divided into C equal parts, the difference between both measured values is divided for each equal distance, and the divided difference values are sequentially added to calculate the sum. , it is also possible to perform the difference and the summation calculation of the difference for each interval distance between the two detectors, and in this case, the travel detector is made to emit a pulse for each interval distance. The error in the vertical displacement amount output from the summation calculator can be corrected in the same manner as described above.

[Effects of the Invention] As described above, according to the present invention, the difference between the values measured by the two measuring instruments is sequentially added for every fixed distance, and the amount of displacement in the vertical direction with respect to the measurement starting point is calculated. When detecting wave-like wear by sequentially determining the amount of displacement for each distance, it is possible to output the displacement amount after correcting the error caused in relation to the measurement wavelength, and to output a measured value that closely approximates the actual wave-like wear. It is possible to output accurate and high-precision measurements. Of course, by taking the difference between the measured values of the two measuring instruments, the measurement error caused by the vertical movement of the measuring cart is also reduced. Therefore, the depth and wavelength of wavy wear etc. on the top surface of the rail can be very accurately measured according to its unevenness, and the removal of wavy wear etc. by the rail head grinding wheel can be done with great accuracy.
This can be done appropriately depending on the wear condition.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention;
FIG. 2 is a side view of the device inspection section, FIG. 3 is a chart showing the relationship between error and output, FIG. 4 is a block diagram showing an embodiment of the error correction section of another invention, and FIG. FIG. 6 is an explanatory diagram of the measurement state by the differential method, FIG. 6 is an explanatory diagram of the amplitude error of wave-like wear, and FIG. 7 is a measurement chart showing the relationship between the amplitude measurement error and wavelength. A, B...Inspection instrument, 1...Rail, 2...Inspection trolley, 3...Front wheel, 4...Rear wheel, 6...Travel detector, 7...Inspection section, 11... Arithmetic unit, 14...
...Difference calculator, 16...Summing calculator, 18...Error correction unit, 19, 19'...Low pass filter,
20... Filter, 21... Addition operator, 22,
22'... High pass filter, 25... Circuit for generating an amplification factor adjustment signal, 26... Variable amplification factor amplifier.

Claims (1)

[Scope of Claims] 1. An inspection trolley that can run on the rails of a track is arranged at regular intervals in the length direction of the rail, and the unevenness on the top surface of the rail is adjusted to the distance from the reference position on the inspection trolley side. and a travel detector that outputs a pulse every time the inspection trolley travels a distance between the two measuring instruments or a distance divided into several equal parts by the distance between the two measuring instruments. , input the measured values output from the two measuring instruments, and perform a calculation to subtract the measured value from one measured value and calculate the difference between both measured values, or calculate the difference between both measured values. A difference calculator that performs a calculation of difference and division by the equal fraction, and a summation calculation that sequentially adds the output values from the difference calculator every time the traveling detector outputs a pulse, and outputs the pulse. It is equipped with a summation calculator that sequentially calculates the amount of displacement in the vertical direction of the top surface of the rail with respect to the measurement starting point at each point for each distance, and outputs the calculation result. In a rail wave wear detection device that measures wave wear based on the amount of vertical displacement based on the measurement starting point on the top of the rail at each point after moving an equal distance, a low-pass filter that has a cut-off characteristic set as follows and that passes the output signal of the displacement amount outputted from the summation unit in an analog quantity; a filter having a frequency characteristic that outputs a correction amount of the error determined by the measurement wavelength ratio of the wave-like wear to the measuring instrument interval; and a signal passing through this filter and the error passing through the low-pass filter. an addition operator that adds the signals including the
A rail wavy wear inspection device characterized by being provided with an error correction section having a cut-off characteristic set according to a frequency in a required measurement range and having a high-pass filter that passes an output signal from the addition arithmetic unit. . 2. The low-pass filter and high-pass filter with cut-off characteristics set according to the necessary measurement range, and the filter that outputs the amount of error correction, are designed so that their frequency characteristics are controlled by the speed signal from the running detector. A rail wavy wear measuring device according to claim 1. 3. The inspection carts that can run on the rails of the track are arranged at regular intervals in the length direction of the rails, and the irregularities on the top surface of the rails are measured by the distance from the reference position on the inspection cart side. 2 a traveling detector that outputs a pulse every time the measuring cart travels a distance between the two measuring devices or a distance divided into several equal parts; Input the measured values output by the measuring instrument and perform a calculation to subtract the other measured value from one measured value and calculate the difference between the two measured values, or calculate the equal fraction by subtracting the two measured values. a difference calculator that performs a calculation of dividing by , and a summation calculation that sequentially adds the output values from the difference calculator each time the travel detector outputs a pulse, and each point for each distance where the pulse is output. A summation calculator that sequentially calculates the displacement position of the top surface of the rail in the vertical direction with respect to the measurement starting point and outputs the calculation result, and the inspection cart moves a distance between the two measuring instruments or a distance that divides the interval into several equal parts. In a rail wave wear detection device that measures wave wear based on the amount of vertical displacement with respect to the measurement starting point on the top of the rail at each point, the cut-off characteristic is set according to the frequency of the required measurement range. and an amplification factor adjustment signal corresponding to a signal including a measurement error of the displacement amount that has passed through the low-pass filter and that passes the output signal of the displacement amount output from the summation calculator in an analog quantity. A circuit that generates a signal containing the error that has passed through the low-pass filter is input, and an amplification factor adjustment signal from the circuit is used to generate the error that is determined by the measurement wavelength ratio of the wave-like wear to the measuring instrument interval. a variable amplification amplifier that performs amplification while being adjusted to an amplification factor that includes a correction amount;
A rail corrugated wear inspection device comprising: an error correction section having a cut-off characteristic set according to a frequency in a required measurement range and a high-pass filter that passes an output signal of the amplifier.