CN109017871B - Device and method for dynamically measuring geometric parameters of train wheels on line - Google Patents

Device and method for dynamically measuring geometric parameters of train wheels on line Download PDF

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CN109017871B
CN109017871B CN201810678254.7A CN201810678254A CN109017871B CN 109017871 B CN109017871 B CN 109017871B CN 201810678254 A CN201810678254 A CN 201810678254A CN 109017871 B CN109017871 B CN 109017871B
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displacement sensor
laser displacement
wheel
rim
eddy current
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CN109017871A (en
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贺子铭
徐见
马开富
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Maanshan City Leishi Track Traffic Equipment Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
    • B61K9/00—Railway vehicle profile gauges; Detecting or indicating overheating of components; Apparatus on locomotives or cars to indicate bad track sections; General design of track recording vehicles
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Abstract

The invention discloses a device and a method for dynamically measuring geometric parameters of train wheels on line, and belongs to the technical field of train wheel detection. The invention discloses a device for dynamically measuring geometric parameters of train wheels on line, which comprises a laser displacement sensor I and a laser displacement sensor II which are sequentially arranged on the inner side of a track along the running direction of a train, wherein detection light beams of the laser displacement sensor I and the laser displacement sensor II are vertical to the inner rim surface of the wheel and the top surface of the track upwards. The invention can obtain the geometric parameters of the train wheels by arranging the two laser displacement sensors and processing the acquired data, thereby realizing the online dynamic measurement of the geometric parameters of the train wheels, improving the measurement efficiency, having higher measurement precision and large measurement range.

Description

Device and method for dynamically measuring geometric parameters of train wheels on line
Technical Field
The invention belongs to the technical field of train wheel detection, and particularly relates to a device and a method for dynamically measuring geometric parameters of train wheels on line.
Background
The train wheel is one of the most important running parts of the rail transit train and bears all dynamic and static loads of the train. However, during the running process of the train, the wheels are abraded to different degrees due to long-term friction between the wheels and the track, such as diameter abrasion, eccentric abrasion of wheel rims and the like. The diameter abrasion can cause the diameter difference of the same vehicle or the same frame or the same pair of wheels to exceed the limit, the height of the wheel rim is increased, the eccentric abrasion of the wheel rim can cause the thickness of the wheel rim to be reduced and the comprehensive value of the wheel rim to be reduced, and the occurrence of the conditions can cause great threat to the driving safety. Thus, the diameter (D) of the train wheel is measured timely, quickly and accuratelyT) The wheel rim height (Sh), the wheel rim thickness (Sd), the wheel rim comprehensive value (Qr) and other geometric parameters have great significance for guaranteeing the driving safety of the train.
The existing detection means of the geometric parameters of the wheel mainly comprise manual measurement and static measurement. The manual measurement mainly utilizes a fourth detector and a wheel diameter ruler to roughly measure the geometric parameters of the wheel, and has the advantages of low equipment investment, low precision, large labor investment and long measurement period. The static measurement is a means for measuring geometric parameters of the wheel by using special equipment such as a lathe and the like, has the advantage of high precision, and has the defects of large equipment investment, high cost, large consumption of manpower and material resources and longer measurement period, thereby influencing the normal use of the train.
Due to the limitations of manual and static measurements, more and more people are focusing on the research of on-line dynamic measurement methods. For example, application No. 200610155282.8 discloses an on-line detection method and device for the diameter of a vehicle wheel set, which uses the projection information of a structured light source on the wheel set tread and the information of the base point position detected by a displacement sensor to detect the average diameter parameter of the wheel and the wheel diameter difference parameter of the left and right wheels, but the method has the defects of large influence by external light, slow response speed, low measurement accuracy and the like. Application number 201410519742.5 discloses an on-line detection method and device for the size of an urban rail train wheel set, the application measures the coordinates of the lowest points of wheel rims of tread contour lines at different moments based on a two-dimensional laser displacement sensor technology, under the condition that the speed is known, points at different moments are restored to coordinate values at the same moment, the circle where the top point of the wheel rim of a wheel is located is fitted by using the principle that three points form a circle, and the diameter of the wheel is obtained by subtracting the height of the wheel rim twice from the diameter of the top point of the wheel rim. In the method, the speed is taken as known, and in the process of restoring the values of the lowest points of the wheel rims at different moments to the coordinate values at the same moment, the restored coordinate values are distorted due to the deviation of the speed, so that the diameters of the vertex circles of the fitted wheel rims have larger deviation.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the problems existing in the existing train wheel geometric parameter measurement, and provides a device and a method for dynamically measuring the train wheel geometric parameters on line. By adopting the technical scheme of the invention, the geometric parameters of the train wheels can be dynamically measured on line, and the measurement precision is higher, thereby being beneficial to ensuring the safe running of the train.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention discloses a device for dynamically measuring geometric parameters of train wheels on line, which comprises a laser displacement sensor I and a laser displacement sensor II which are sequentially arranged on the inner side of a track along the running direction of a train, wherein detection light beams of the laser displacement sensor I and the laser displacement sensor II are vertical to the inner rim surface of the wheel and the top surface of the track upwards.
Furthermore, a starting switch is arranged at the starting end of the data acquisition section on the inner side of the track, and a stopping switch is arranged at the ending end of the data acquisition section.
Furthermore, the sampling frequency of the laser displacement sensor I is the same as that of the laser displacement sensor II.
Furthermore, the inner side of the track is also provided with an eddy current displacement sensor I and an eddy current displacement sensor II which are distributed at intervals.
Furthermore, the sampling frequencies of the two eddy current displacement sensors are the same, and the sampling frequency K of the eddy current displacement sensor is the same1Sampling frequency K greater than or equal to that of laser displacement sensor2。
Furthermore, the eddy current displacement sensor and the laser displacement sensor are connected to a data processing system.
Furthermore, the starting switch, the eddy current displacement sensor, the laser displacement sensor and the stopping switch are all connected with the control system.
The invention discloses a method for dynamically measuring geometric parameters of train wheels on line, which comprises the following steps that when a starting switch is triggered, two laser displacement sensors simultaneously start to acquire data, when a stopping switch is triggered, the data acquisition is finished, the acquired data are processed, and the geometric parameters of the train wheels are obtained, wherein the specific processing process comprises the following steps:
step 1, sequentially intercepting the distance value di of the rim vertex in the contour line measured by the laser displacement sensor I, namely the minimum distance value in each contour line, and using the minimum distance value
Figure BDA0001710291130000021
Establishing a coordinate set by taking the X coordinate and the di coordinate as the Y coordinate
Figure BDA0001710291130000022
Step 2, performing circle fitting on the obtained coordinate set to obtain the diameter D of the rim vertex circle;
step 3, finding out a contour line A with the minimum rim vertex distance and a rim vertex distance value Z on the contour line from the contour line measured by the laser displacement sensor I;
step 4, calculating diameter values D corresponding to distance values of all points on the A-th contour line measured by the laser displacement sensor IjThe calculation formula is as follows:
Dj＝D-2(Zj-Z)(j＝1，2，3，……)
in the formula: d is the diameter of the top circle of the wheel rim, and is mm; z is the distance value of the wheel rim vertex in the A-th contour line measured by the laser displacement sensor I and is in unit mm; zjMeasuring the distance value of other points in the A-th contour line by the laser displacement sensor I in unit of mm;
and 5, calculating diameter values corresponding to distance values of all points on the A-th contour line measured by the laser displacement sensor II, wherein the calculation formula is as follows:
Figure BDA0001710291130000031
in the formula: r is the radius of the rim vertex circle in mm; z is the distance value of the wheel rim vertex in the A-th contour line measured by the laser displacement sensor I and is in unit mm; a iskThe distance value of other points in the A-th contour line measured by the laser displacement sensor II is in unit of mm; h is the height difference of the sensing head of the laser displacement sensor I and the sensing head of the laser displacement sensor II along the direction vertical to the top surface of the track, and is in unit mm, and h is positive when the sensing head of the laser displacement sensor I is higher than the sensing head of the laser displacement sensor II, otherwise, h is negative; l is2The distance between the sensing heads of the two laser displacement sensors along the direction parallel to the top surface of the track is unit mm;
step 6, interceptingThe diameter between the inner rim surface of the wheel and the top point of the wheel rim in the A-th contour line measured by the laser displacement sensor I is combined with the self X-axis coordinate of the laser displacement sensor I to form a coordinate set { (X)d，Dd) }; intercepting the diameter between the top point of the wheel rim and the outer rim surface of the wheel in the A-th contour line measured by the laser displacement sensor II, and combining the diameter with the X-axis coordinate of the laser displacement sensor to form a coordinate set { (X)e，De) }; splicing the intercepted coordinate set by taking the vertex of the wheel rim as a characteristic point, removing a repeated vertex coordinate of the wheel rim during splicing, integrating an X coordinate, and taking the inner rim surface of the wheel as a horizontal coordinate zero point and the outer rim surface of the wheel as an X axis to obtain a diameter coordinate set { (X) from the inner rim surface of the wheel to different positions of the outer rim surfacef，Df)}；
Step 7, in the coordinate set { (X)f，Df) Find X infD or the diameter corresponding to the abscissa closest to D, namely the diameter D of the wheel treadTWherein d is the distance between the wheel diameter measuring base point and the inner rim surface of the wheel, and the height of the wheel rim is
Figure BDA0001710291130000032
Step 8, in the coordinate set { (X)f，Df) Finding the abscissa X of the outer side of the wheel rim corresponding to the wheel rim thickness measuring base pointhAnd the abscissa corresponding to the inner rim surface of the wheel is marked as X1And the rim thickness is Sd ═ Xh-X1(ii) a In a coordinate set { (X)f，Df) Finding the abscissa X of the outer side of the wheel rim corresponding to the wheel rim comprehensive value measurement base pointqIf the wheel rim integrated value is Qr ═ Xh-Xq。
Further, the train running speed V in step 1 is measured according to the following method:
a. calculating the data quantity n from the minimum value in the data measured by the eddy current displacement sensor I to the minimum value in the data measured by the eddy current displacement sensor II;
b. and calculating the running speed of the wheels by the following calculation formula:
Figure BDA0001710291130000033
wherein V is the running speed of the wheel passing through the measuring interval and is unit mm/ms; l is1The center distance K from the eddy current displacement sensor I to the eddy current displacement sensor II along the direction parallel to the top surface of the track1The sampling frequency of the two eddy current displacement sensors, kHz.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the invention discloses a device for dynamically measuring geometric parameters of train wheels on line, which comprises a laser displacement sensor I and a laser displacement sensor II which are sequentially arranged on the inner side of a track along the running direction of a train, wherein detection light beams of the laser displacement sensor I and the laser displacement sensor II are perpendicular to the inner rim surface of the train wheel and the top surface of the track upwards, and the geometric parameters of the train wheels can be obtained by arranging the two laser displacement sensors and processing the acquired data, so that the dynamic measurement of the geometric parameters of the train wheels on line is realized, the measurement efficiency is improved, the measurement precision is higher, and the measurement range is large.
(2) According to the device for dynamically measuring the geometric parameters of the train wheels on line, the characteristic of high sampling frequency of the eddy current displacement sensor is utilized, the eddy current displacement sensor I and the eddy current displacement sensor II are further arranged on the inner side of the track, and the running speed of the train is measured through the arrangement of the eddy current displacement sensors, so that the accuracy of the running speed of the wheels can be effectively improved, and the measurement precision of the geometric parameters of the train wheels can be effectively ensured.
(3) According to the method for dynamically measuring the geometric parameters of the train wheels on line, the two laser displacement sensors simultaneously start to acquire data when the starting switch is triggered, and the data acquisition is finished when the stopping switch is triggered to process the acquired data, so that the dynamic measurement of the geometric parameters of the train wheels on line can be realized, and the measurement precision is high.
(4) The method for dynamically measuring the geometric parameters of the train wheels on line adopts non-contact measurement, the wheels are not abraded in the measurement process, and the measuring device is simple in structure and installation, low in cost and suitable for popularization and application.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for dynamically measuring geometric parameters of train wheels on line according to the present invention;
fig. 2 is a schematic view of the structure of the wheel to be measured.
The reference numerals in the schematic drawings illustrate:
1. starting a switch; 2. an eddy current displacement sensor I; 3. a laser displacement sensor I; 4. an eddy current displacement sensor II; 5. a laser displacement sensor II; 6. the switch is stopped.
Detailed Description
For a further understanding of the invention, reference will now be made in detail to the embodiments illustrated in the drawings.
Example 1
As shown in fig. 1, the device for dynamically measuring geometric parameters of a train wheel on line of this embodiment includes a start switch 1, a laser displacement sensor I3, a laser displacement sensor II5, and a stop switch 6, which are sequentially disposed on the inner side of a track along the running direction of the train, wherein the detection beams of the laser displacement sensor I3 and the laser displacement sensor II5 are both perpendicular to the inner rim surface of the wheel and the top surface of the track, and the sampling frequencies are the same. In this embodiment, the start switch 1, the laser displacement sensor and the stop switch 6 are all connected to the control system, and the laser displacement sensor is further connected to the data processing system.
Aiming at the problems existing in the existing train wheel geometric parameter measurement, the geometric parameters of the train wheels can be obtained only by arranging two laser displacement sensors and processing the acquired data, so that the on-line dynamic measurement of the geometric parameters of the train wheels is realized, the measurement efficiency is improved, the measurement precision is higher, and the measurement range is large.
Specifically, with reference to fig. 1 and fig. 2, in the method for dynamically measuring geometric parameters of train wheels on line according to this embodiment, when the start switch 1 is triggered, the two laser displacement sensors start to acquire data at the same time, when the stop switch 6 is triggered, the data acquisition is finished, the acquired data is processed, and the geometric parameters of the train wheels are obtained, and the specific processing procedure is as follows:
step 1, sequentially intercepting the distance value di of the rim vertex in the contour line measured by the laser displacement sensor I3, namely the minimum distance value in each contour line, and using the distance value di to obtain the distance value
Figure BDA0001710291130000051
Establishing a coordinate set by taking the X coordinate and the di coordinate as the Y coordinate
Figure BDA0001710291130000052
Step 2, performing circle fitting on the obtained coordinate set to obtain the diameter D of the rim vertex circle;
step 3, finding out a contour line A with the minimum rim vertex distance and a distance value Z of the rim vertex on the contour line from the contour line measured by the laser displacement sensor I3;
step 4, calculating diameter values D corresponding to distance values of all points on the A-th contour line measured by the laser displacement sensor I3jThe calculation formula is as follows:
Dj＝D-2(Zj-Z)(j＝1，2，3，……)
in the formula: d is the diameter of the top circle of the wheel rim, and is mm; z is the distance value of the wheel rim vertex in the A-th contour line measured by the laser displacement sensor I3 and is in unit mm; zjThe distance value of other points in the A-th contour line measured by the laser displacement sensor I3 is in unit of mm;
step 5, calculating diameter values corresponding to distance values of all points on the A-th contour line measured by the laser displacement sensor II5, wherein the calculation formula is as follows:
Figure BDA0001710291130000053
in the formula: r is the radius of the rim vertex circle in mm; z is the middle wheel of the A-th contour line measured by the laser displacement sensor I3Distance value of edge vertex in mm; a iskThe distance value of other points in the A-th contour line measured by the laser displacement sensor II5 is in unit of mm; h is the height difference of the sensing head of the laser displacement sensor I3 and the sensing head of the laser displacement sensor II5 along the direction vertical to the top surface of the track, the unit is mm, and h is positive when the sensing head of the laser displacement sensor I3 is higher than the sensing head of the laser displacement sensor II5, otherwise, h is negative; l is2The distance between the sensing heads of the two laser displacement sensors along the direction parallel to the top surface of the track is unit mm;
step 6, intercepting the diameter between the inner rim surface of the wheel and the top point of the wheel rim in the A-th contour line measured by the laser displacement sensor I3, and combining the diameter with the self X-axis coordinate of the laser displacement sensor I3 to form a coordinate set { X }d，Dd}; the diameter between the top point of the wheel rim and the outer rim surface of the wheel in the A-th contour line measured by the laser displacement sensor II5 is intercepted and is combined with the X-axis coordinate of the laser displacement sensor to form a coordinate group { X }e，De}; splicing the intercepted coordinate set by taking the vertex of the wheel rim as a characteristic point, removing a repeated vertex coordinate of the wheel rim during splicing, integrating the X coordinate, and taking the inner rim surface of the wheel as a horizontal coordinate zero point and the outer rim surface of the wheel as an X axis to obtain a diameter coordinate set { X at different positions from the inner rim surface to the outer rim surface of the wheelf，Df}；
Step 7, in the coordinate set { Xf，DfFind X infD or the diameter corresponding to the abscissa closest to D, namely the diameter D of the wheel treadTWherein d is the distance between the wheel diameter measuring base point and the inner rim surface of the wheel, and the height of the wheel rim is
Figure BDA0001710291130000061
Step 8, in the coordinate set { Xf，DfFinding the abscissa X of the outer side of the wheel rim corresponding to the wheel rim thickness measuring base pointhAnd the abscissa corresponding to the inner rim surface of the wheel is marked as X1And the rim thickness is Sd ═ Xh-X1(ii) a In the coordinate set { Xf，DfFind the base point of the wheel rim integrated value measurementAbscissa X of outer side of wheel rimqIf the wheel rim integrated value is Qr ═ Xh-Xq。
Example 2
The structure of the device for dynamically measuring the geometric parameters of the train wheels on line in the embodiment is basically the same as that of the embodiment 1, and the difference is mainly as follows: in this embodiment, the inner side of the track is further provided with an eddy current displacement sensor I2 and an eddy current displacement sensor II4 which are distributed at intervals, the eddy current displacement sensor I2 is installed between the laser displacement sensor I3 and the start switch 1, and the eddy current displacement sensor II4 is installed between the two laser displacement sensors. The two eddy current displacement sensors have the same sampling frequency, and the eddy current displacement sensors have the same sampling frequency K1Sampling frequency K greater than or equal to that of laser displacement sensor2. Meanwhile, the eddy current displacement sensor I2 and the eddy current displacement sensor II4 are connected with the control system and the data processing system, and the eddy current displacement sensor is installed to ensure that the wheel rim can enter the measuring area of the eddy current displacement sensor when the wheel passes through.
The method for dynamically measuring the geometric parameters of the train wheels on line in the embodiment has the same steps as the embodiment 1, and mainly comprises the following steps: in this embodiment, the running speed V of the train in the measurement section is calculated by using the measurement data of the eddy current displacement sensor I2 and the eddy current displacement sensor II4, and when the start switch 1 is started, the two eddy current displacement sensors also collect data at the same time, and when the stop switch is triggered, the two eddy current displacement sensors stop collecting at the same time. The specific calculation method of the running speed V of the train comprises the following steps:
a. calculating the data quantity n from the minimum value in the data measured by the eddy current displacement sensor I2 to the minimum value in the data measured by the eddy current displacement sensor II 4;
b. and calculating the running speed of the wheels by the following calculation formula:
Figure BDA0001710291130000062
wherein V is the running speed of the wheel passing through the measuring interval and is unit mm/ms; l is1Center distance, K, from eddy current displacement sensor I2 to eddy current displacement sensor II4 in a direction parallel to the top surface of the rail1The sampling frequency of the two eddy current displacement sensors, kHz.
The characteristic that the sampling frequency of the eddy current displacement sensor is high is utilized to the embodiment, and the running speed of the train is measured through the arrangement of the eddy current displacement sensor, so that the accuracy of the running speed of the wheel can be effectively improved, and the measurement precision of the geometric parameters of the train wheel can be effectively ensured.
Example 3
The structure and the measuring method of the measuring device in this embodiment are the same as those of embodiment 1, and the differences are mainly as follows: in the embodiment, the distance d between the wheel diameter measurement base point and the inner rim surface of the wheel is 70 mm.
Example 4
The structure and the measuring method of the measuring device in this embodiment are the same as those of embodiment 1, and the differences are mainly as follows: diameter D corresponding to rim thickness measurement base point in the embodimenth＝DT+20。
Example 5
The structure and the measuring method of the measuring device in this embodiment are the same as those of embodiment 1, and the differences are mainly as follows: diameter or D corresponding to the base point of rim thickness measurement in the embodimenth＝DT+24。
Example 6
The structure and the measuring method of the measuring device in this embodiment are the same as those of embodiment 1, and the differences are mainly as follows: in the embodiment, the outside diameter D of the wheel rim corresponding to the wheel rim comprehensive value measuring base pointq＝D-4。
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims (5)

1. A method for dynamically measuring geometric parameters of train wheels on line is characterized by comprising the following steps: measuring by adopting an online dynamic measuring device, wherein the online dynamic measuring device comprises a laser displacement sensor I (3) and a laser displacement sensor II (5) which are sequentially arranged on the inner side of a track along the running direction of a train, detection light beams of the laser displacement sensor I (3) and the laser displacement sensor II (5) are vertical to the inner rim surface of a wheel and the top surface of the track and face upwards, and the sampling frequencies of the laser displacement sensor I (3) and the laser displacement sensor II (5) are the same; the inner side of the track is also provided with an eddy current displacement sensor I (2) and an eddy current displacement sensor II (4) which are distributed at intervals, the sampling frequency of the two eddy current displacement sensors is the same, and the sampling frequency K of the eddy current displacement sensors is1Sampling frequency K greater than or equal to that of laser displacement sensor2(ii) a When starting switch (1) is triggered, two laser displacement sensor begin to gather data simultaneously, and when stopping switch (6) was triggered, data acquisition ended, handled the data of gathering, obtained train wheel geometric parameters, and concrete processing is:
step 1, sequentially intercepting the distance value di of the rim vertex in the contour line measured by the laser displacement sensor I (3) and calculating the distance value diEstablishing a coordinate set { (A) by taking di as a Y coordinate and an X coordinate
Figure DEST_PATH_IMAGE002A
，
Figure DEST_PATH_IMAGE005
) }; wherein I represents the serial number of the effective profile curve measured by the laser displacement sensor I (3), and V is the running speed of the wheel in mm/ms;
step 2, performing circle fitting on the obtained coordinate set to obtain the diameter D of the rim vertex circle;
step 3, finding out a contour line A with the minimum rim vertex distance and a distance value Z of the rim vertex on the contour line from the contour line measured by the laser displacement sensor I (3);
step 4, calculating diameter values corresponding to distance values of all points on the A-th contour line measured by the laser displacement sensor I (3)
Figure DEST_PATH_IMAGE007
The calculation formula is as follows:
Figure DEST_PATH_IMAGE009
in the formula: d is the diameter of the top circle of the wheel rim, and is mm; z is the distance value of the wheel rim vertex in the A-th contour line measured by the laser displacement sensor I (3) and is in unit mm; zjThe distance value of other points in the A-th contour line measured by the laser displacement sensor I (3) is in unit of mm;
step 5, calculating diameter values corresponding to distance values of all points on the A-th contour line measured by the laser displacement sensor II (5), wherein the calculation formula is as follows:
Figure DEST_PATH_IMAGE011
in the formula: r is the radius of the rim vertex circle in mm; z is the distance value of the wheel rim vertex in the A-th contour line measured by the laser displacement sensor I (3) and is in unit mm;
Figure DEST_PATH_IMAGE013
the distance value of other points in the A-th contour line measured by the laser displacement sensor II (5) is in unit of mm; h is the height difference of the sensing head of the laser displacement sensor I (3) and the sensing head of the laser displacement sensor II (5) along the direction vertical to the top surface of the track, and the unit is mm, and h is positive when the sensing head of the laser displacement sensor I (3) is higher than the sensing head of the laser displacement sensor II (5), otherwise, h is negative; l is2The distance between the sensing heads of the two laser displacement sensors along the direction parallel to the top surface of the track is unit mm;
step 6, intercepting laser displacement sensingThe diameter between the inner rim surface of the wheel and the top point of the wheel rim in the A-th contour line measured by the device I (3) is combined with the self X-axis coordinate of the laser displacement sensor I (3) to form a coordinate group { (X)d，Dd) }; intercepting the diameter between the top point of the wheel rim and the outer rim surface of the wheel in the A-th contour line measured by the laser displacement sensor II (5), and combining the diameter with the X-axis coordinate of the laser displacement sensor to form a coordinate group { (X)e，De) }; splicing the intercepted coordinate set by taking the vertex of the wheel rim as a characteristic point, removing a repeated vertex coordinate of the wheel rim during splicing, integrating an X coordinate, and taking the inner rim surface of the wheel as a horizontal coordinate zero point and the outer rim surface of the wheel as an X axis to obtain a diameter coordinate set { (X) from the inner rim surface of the wheel to different positions of the outer rim surfacef，Df）}；
Step 7, in the coordinate set { (X)f，Df) Find X infD or the diameter corresponding to the abscissa closest to D, namely the diameter D of the wheel treadTWherein d is the distance between the wheel diameter measuring base point and the inner rim surface of the wheel, and the height of the wheel rim is
Figure DEST_PATH_IMAGE015
；
Step 8, in the coordinate set { (X)f，Df) Finding the abscissa X of the outer side of the wheel rim corresponding to the wheel rim thickness measuring base pointhAnd the abscissa corresponding to the inner rim surface of the wheel is marked as X1The rim thickness is
Figure DEST_PATH_IMAGE017
(ii) a In a coordinate set { (X)f，Df) Finding the abscissa X of the outer side of the wheel rim corresponding to the wheel rim comprehensive value measurement base pointqThe wheel rim integrated value is
Figure DEST_PATH_IMAGE019
。
2. The method for on-line dynamic measurement of geometric parameters of train wheels according to claim 1, wherein: the starting end of the inner side of the track, which is positioned in the data acquisition interval, is provided with a starting switch (1), and the ending end of the inner side of the track, which is positioned in the data acquisition interval, is provided with a stopping switch (6).
3. The method for on-line dynamic measurement of geometric parameters of train wheels according to claim 1, wherein: the eddy current displacement sensor and the laser displacement sensor are both connected to a data processing system.
4. The method for on-line dynamic measurement of geometric parameters of train wheels according to claim 1, wherein: the starting switch (1), the eddy current displacement sensor, the laser displacement sensor and the stopping switch (6) are all connected with the control system.
5. The method for dynamically measuring geometrical parameters of train wheels on line according to any one of claims 1 to 4, wherein: the running speed V of the wheels in the step 1 is measured according to the following method:
a. calculating a data quantity n from the minimum value in the data measured by the eddy current displacement sensor I (2) to the minimum value in the data measured by the eddy current displacement sensor II (4);
b. calculating the running speed of the wheels, wherein the calculation formula is as follows:
Figure DEST_PATH_IMAGE021
wherein V is the running speed of the wheel passing through the measuring interval and is unit mm/ms; l is1The center distance from the eddy current displacement sensor I (2) to the eddy current displacement sensor II (4) along the direction parallel to the top surface of the track, K1The sampling frequency of the two eddy current displacement sensors, kHz.
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Citations (5)

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