CN109443264B - Online measuring device and method for wheel cake parameters of railway vehicle - Google Patents
Online measuring device and method for wheel cake parameters of railway vehicle Download PDFInfo
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- CN109443264B CN109443264B CN201811437698.8A CN201811437698A CN109443264B CN 109443264 B CN109443264 B CN 109443264B CN 201811437698 A CN201811437698 A CN 201811437698A CN 109443264 B CN109443264 B CN 109443264B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/10—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring diameters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/20—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring contours or curvatures, e.g. determining profile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/14—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring distance or clearance between spaced objects or spaced apertures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/08—Railway vehicles
- G01M17/10—Suspensions, axles or wheels
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Abstract
The invention discloses a device and a method for online measurement of wheel cake parameters of a railway vehicle, wherein the device comprises a 2D laser displacement sensor arranged on the outer side of a track, an eddy current sensor arranged on the inner side of the track and magnetic steel arranged on the inner side of the track; the 2D laser displacement sensor and the eddy current sensor are used for measuring a wheel cake tread curve, the diameter of a rolling circle and the jumping of the rolling circle; the eddy current sensor is used for measuring the inside distance; the magnetic steel is used for obtaining a starting signal, so that the wheel cake measuring system enters a standby state, the magnetic steel does not obtain a signal after the set time, the system is in standby state, automatic online measurement is realized, the eddy current sensor measures the height of the lowest point of the wheel rim, the measuring precision is high, and the diameter of the wheel cake is calculated by performing curve fitting on each group of scattered point data at different moments.
Description
Technical Field
The invention relates to the technical field of online measurement of wheel cake parameters of railway vehicles, in particular to an online measurement device and method for wheel cake parameters of railway vehicles.
Background
The wheelset is an extremely important component of the vehicle running part, and is responsible for transmitting the force between the wheelset and the rail as well as bearing the entire weight of the vehicle body. The wheel set has great importance for the safe operation of the train, accurately measures parameters such as the rim thickness, the rim height, the vertical abrasion, the tread abrasion, the wheel diameter and the like of the wheel, ensures that the shape parameters of the tread of the wheel of the train and the diameter difference of the left wheel and the right wheel of the same shaft meet relevant regulations and standards, and is very important for ensuring the safe operation of the train and smoothly completing a transportation plan.
However, the existing wheel pair detection device mainly comprises a fourth checker and a wheel pair ruler, and the detection tool needs manual reading, so that errors are easy to occur, and the detection reliability is influenced; in addition, the running speed of the train is measured by the means in the prior art, and the precision of the train is difficult to meet the measurement requirement, so that a large error of a measurement result is caused.
Therefore, it is necessary to invent an online measuring device and method for wheel cake parameters of a railway vehicle to solve the above problems.
Disclosure of Invention
The invention aims to provide a device and a method for online measuring wheel cake parameters of a railway vehicle, wherein a magnetic steel is used for obtaining a starting signal, a wheel cake measuring system is enabled to enter a standby state, the magnetic steel does not obtain a signal after exceeding a set time, the system is standby, automatic online measurement is realized, a 2D laser displacement sensor and an eddy current sensor are used for measuring a wheel cake tread curve, a rolling circle diameter and rolling circle bounce, the eddy current sensor is used for measuring an inner side distance, the measuring precision is high, the diameter, abrasion and other conditions of the wheel cake of the railway vehicle can be accurately and rapidly calculated by establishing a coordinate system, obtaining the wheel cake tread curve, obtaining the characteristic value of the wheel cake tread curve, obtaining the wheel cake rolling circle diameter, obtaining the inner side distance and equivalent taper and improving the data management application function, the diameter, abrasion and other conditions of the wheel cake of the railway vehicle can be directly printed and, to solve the problems set forth in the background art described above.
In order to achieve the purpose, the invention provides the following technical scheme: a rail vehicle wheel cake parameter online measuring device comprises a 2D laser displacement sensor arranged on the outer side of a rail, an eddy current sensor arranged on the inner side of the rail and magnetic steel arranged on the inner side of the rail;
the 2D laser displacement sensor and the eddy current sensor are used for measuring a wheel cake tread curve, a rolling circle diameter and rolling circle run-out;
the eddy current sensor is used for measuring the inside distance;
the magnetic steel is used for obtaining a starting signal, so that the wheel cake measuring system enters a standby state, the magnetic steel does not obtain a signal after the set time, and the system is in standby.
Preferably, the track comprises a T-shaped track and a groove-shaped track, the eddy current sensor is installed towards and perpendicular to the inner end face of the wheel cake, the eddy current sensor is installed upwards perpendicular to the ground, the 2D laser displacement sensor and the eddy current sensor are fixedly arranged on the same support, and the relative spatial positions of the two sensors are fixed and known.
Preferably, an included angle between a laser emission plane a of the 2D laser displacement sensor and a plane B perpendicular to the track is α, and an included angle between a laser center line of the 2D laser displacement sensor and a perpendicular plane C parallel to the track is β.
A rail vehicle wheel cake parameter online measurement method comprises the following specific measurement method:
the method comprises the following steps: mounting of an on-line measuring device
The 2D laser displacement sensor 1 is arranged on the outer side of a track through a support, the eddy current sensor 2 is arranged on the inner side of the track and faces and is perpendicular to the inner end face of a wheel cake, the eddy current sensor 2 is arranged on the inner side of the track and is perpendicular to the ground and arranged upwards, and in addition, the magnetic steel 3 is arranged on the inner side of the track;
step two: establishing a coordinate system
Coordinate system 1: in the plane A, the original coordinate system of the 2D laser displacement sensor 1 is provided, the intersection line of the emission window plane of the 2D laser displacement sensor 1 and the plane A is an x axis, and the laser emission direction of the 2D laser displacement sensor (1) is a y axis;
coordinate system 2: in the plane A, a horizontal plane parallel to the rail is called a plane D, the intersecting line of the plane A and the plane D is an x axis, and the intersecting line vertical to the x axis is a y axis;
coordinate system 3: in plane C, parallel to the rails is the x-axis and perpendicular to the rails is the y-axis;
step three: obtaining wheel cake tread curve
a) When the wheel cake rolls through the magnetic steel (3), the system enters a standby state, and when the wheel cake rolls to be close to the 2D laser displacement sensor (1) and the eddy current sensor (2), the 2D laser displacement sensor (1) and the eddy current sensor (2) start to measure and obtain multiple groups of data at different moments;
b) carrying out coordinate conversion on the data obtained in the step 1 to obtain data in a coordinate system 2;
c) performing curve fitting on each group of scattered point data at different moments in a coordinate system 2 to obtain a plurality of wheel cake tread curves at different moments;
d) and calculating the height of the wheel rim of each wheel cake tread curve at different moments according to the standard of the railway industry, selecting three curves with the minimum height of the wheel rim, and carrying out average processing on the three curves to obtain the final wheel cake tread curve. (ii) a
Step four: obtaining characteristic value of wheel cake tread curve
Calculating the obtained wheel cake tread curve according to the railway industry standard to obtain data of the height of the wheel rim, the thickness of the wheel rim and the width of the wheel rim;
step five: obtaining the diameter of the rolling circle of the wheel cake
a) Finding a tread base point P on each wheel cake tread curve0、P1、……..PiAnd obtaining the height coordinate y of the tread base point at different moments in the coordinate system 3 through coordinate conversioni；
b) And assuming that the running speed of the vehicle is v (unknown) and the sampling time interval of the 2D laser displacement sensor (1) is t, the transverse coordinates of the base point of the tread at different moments in the step 1 are xi+itv；
c) Each tread base point is supposed to be on the same circle in the coordinate system 3, therefore, different vehicle running speeds v are input, circle fitting is carried out on the tread base point data, and a fitting circle with the minimum fitting error is selected as a circle where the tread base point is located, so that the rolling circle diameter D, the central coordinate of the rolling circle diameter D and the corresponding vehicle speed v are obtained;
step six: acquisition of rolling circle run-out value
a) Obtaining the coordinates of the base points of the tread at different moments according to the vehicle speed v obtained in the step five;
b) calculating the distance from the tread base point at different moments to the center of the rolling circle according to the central coordinate of the rolling circle obtained in the step five and the coordinates of the tread base point at different moments in the step three;
c) subtracting the radius of the rolling circle according to the obtained distance from the tread base point to the center of the rolling circle at different moments to obtain the radial run-out value of the rolling circle;
step seven: obtaining of inner side distance and equivalent taper
The distance between the eddy current sensors (2) on the inner sides of the two rails is calibrated to obtain the distance between the inner sides of the wheel pairs, and then the equivalent taper is calculated according to the standard of the railway industry;
step eight: perfecting data management application functions
The method comprises the following steps of (1) recording the date, the number, the axial position and the wheel number of a vehicle by combining a vehicle number identification device;
function 2, can calculate the diameter difference of the same axle, with the diameter difference of the bogie, with the diameter difference of the car, through inputting the threshold value, realize the alarm of the out-of-tolerance;
function 4, through the measurement of a certain time, can calculate the speed and trend of wearing and tearing, predict and wear out the time of the out-of-tolerance, guide the maintenance work of the wheel cake;
function 5, can interface with vehicle section management system, realize the data sharing, bring the wheel cake measuring system into the vehicle section management system;
function 6, printout.
The invention has the technical effects and advantages that:
1. the invention utilizes the magnetic steel to obtain a starting signal, so that the wheel cake measuring system enters a standby state, the magnetic steel does not obtain a signal after exceeding the set time, the system is in standby state, automatic online measurement is realized, the 2D laser displacement sensor and the eddy current sensor measure the wheel cake tread curve, the diameter of a rolling circle and the rolling circle bounce, the eddy current sensor measures the inner side distance, the measurement precision is high, the conditions of abrasion and the like of the wheel cake of the rail vehicle can be accurately and quickly calculated by establishing a coordinate system, obtaining the wheel cake tread curve, obtaining the characteristic value of the wheel cake tread curve, obtaining the diameter of the wheel cake rolling circle, obtaining the inner side distance and the equivalent taper and perfecting the data management application function, and the data can be directly printed and viewed, is directly clear and is convenient to; the fewer sensors, the fewer error sources and the higher measurement precision; the invention uses the least number of sensors to completely realize the measurement function; the invention can realize the function of measuring the diameter with high precision without measuring the running speed of the train;
2. the wheel cake measuring system is combined with a car number identification device, records the date, the number, the axial position and the number of a car, can calculate the coaxial diameter difference, the diameter difference with a bogie and the diameter difference with the car, realizes out-of-tolerance alarm by inputting the threshold values of the height of a wheel rim, the thickness of the wheel rim, the diameter of a rolling circle, the inner side distance, the equivalent taper and the like, can calculate the wear speed and the trend by measuring for a certain time, predicts the wear out-of-tolerance time, guides the maintenance work of the wheel cake, can be connected with a vehicle section management system, realizes data sharing, brings the wheel cake measuring system into the vehicle section management system, and can print and output data;
3. the measuring device can be arranged on a T-shaped rail and a groove-shaped rail, and is suitable for freight railway vehicles, passenger railway vehicles, subway vehicles and urban rail vehicles.
Drawings
FIG. 1 is a schematic structural diagram of an on-line measuring device according to the present invention.
FIG. 2 shows a base point P of the tread of the wheel cake tread curve of the present invention0、P1、……..PiSchematic in a coordinate system.
In the figure: 1-2D laser displacement sensor, 2-electric eddy current sensor, 3-magnetic steel.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the online measuring device for the wheel cake parameters of the railway vehicle shown in the figures 1-2 comprises a 2D laser displacement sensor 1 arranged on the outer side of a track, an eddy current sensor 2 arranged on the inner side of the track and magnetic steel 3 arranged on the inner side of the track;
the 2D laser displacement sensor 1 and the eddy current sensor 2 are used for measuring a wheel cake tread curve, the diameter of a rolling circle and the jumping of the rolling circle;
the eddy current sensor 2 is used for measuring the inside distance;
the magnetic steel 3 is used for obtaining a starting signal, so that the wheel cake measuring system enters a standby state, the magnetic steel 3 does not obtain a signal after exceeding a set time, and the system is in standby.
Further, in the above scheme, the track includes a T-shaped track and a groove-shaped track, the eddy current sensor 2 is installed facing and perpendicular to the inner end face of the wheel cake, the eddy current sensor 2 is installed perpendicular to the ground, and the 2D laser displacement sensor 1 and the eddy current sensor 2 are fixedly arranged on the same support, and have fixed and known relative spatial positions.
Further, in the above scheme, an included angle between a laser emission plane a of the 2D laser displacement sensor 1 and a plane B perpendicular to the track is α, and an included angle between a laser center line of the 2D laser displacement sensor 1 and a perpendicular plane C parallel to the track is β.
The starting signal is obtained through the magnetic steel 3, so that the wheel cake measuring system enters a standby state, the magnetic steel 3 does not obtain a signal after the set time, the system is in standby state, automatic online measurement is realized, the 2D laser displacement sensor 1 and the eddy current sensor 2 measure the wheel cake tread curve, the rolling circle diameter and the rolling circle run-out, the eddy current sensor 2 measures the inner side distance, the measurement precision is high, the wheel cake measuring system is connected with the train number recognition device and the train section management system, the data storage and transmission are realized, and the measuring device can be installed on a T-shaped rail and a groove-shaped rail and is suitable for freight railway trains, passenger railway trains, subway trains and urban rail trains.
Example 2:
a rail vehicle wheel cake parameter online measurement method comprises the following specific measurement method:
the method comprises the following steps: mounting of an on-line measuring device
The 2D laser displacement sensor 1 is arranged on the outer side of a track through a support, the eddy current sensor 2 is arranged on the inner side of the track and faces and is perpendicular to the inner end face of a wheel cake, the eddy current sensor 2 is arranged on the inner side of the track and is perpendicular to the ground and arranged upwards, and in addition, the magnetic steel 3 is arranged on the inner side of the track;
step two: establishing a coordinate system
Coordinate system 1: in the plane A, the original coordinate system of the 2D laser displacement sensor 1 is provided, the intersection line of the emission window plane of the 2D laser displacement sensor 1 and the plane A is an x axis, and the laser emission direction of the 2D laser displacement sensor 1 is a y axis;
coordinate system 2: in the plane A, a horizontal plane parallel to the rail is called a plane D, the intersecting line of the plane A and the plane D is an x axis, and the intersecting line vertical to the x axis is a y axis;
coordinate system 3: in plane C, parallel to the rails is the x-axis and perpendicular to the rails is the y-axis;
step three: obtaining wheel cake tread curve
a. When the wheel cake rolls through the magnetic steel 3, the system enters a standby state, and when the wheel cake rolls to be close to the 2D laser displacement sensor 1 and the eddy current sensor 2, the 2D laser displacement sensor 1 and the eddy current sensor 2 start to measure and obtain multiple groups of data at different moments;
b. carrying out coordinate conversion on the data obtained in the step 1 to obtain data in a coordinate system 2;
c. performing curve fitting on each group of scattered point data at different moments in a coordinate system 2 to obtain a plurality of wheel cake tread curves at different moments;
d. calculating the height of the wheel rim of each wheel cake tread curve at different moments according to the standard of the railway industry, selecting three curves with the minimum height of the wheel rim, and carrying out average processing on the three curves to obtain a final wheel cake tread curve;
step four: obtaining characteristic value of wheel cake tread curve
Calculating the obtained wheel cake tread curve according to the railway industry standard to obtain data of the height of the wheel rim, the thickness of the wheel rim and the width of the wheel rim;
step five: obtaining the diameter of the rolling circle of the wheel cake
a) Finding a tread base point P on each wheel cake tread curve0、P1、……..PiAnd obtaining the height coordinate y of the tread base point at different moments in the coordinate system 3 through coordinate conversioni，See in particular fig. 2;
b) and assuming that the running speed of the vehicle is v and the sampling time interval of the 2D laser displacement sensor (1) is t, the transverse coordinates of the base point of the tread at different moments in the step 1 are xi+itv；
c) Each tread base point is supposed to be on the same circle in the coordinate system 3, therefore, different vehicle running speeds v are input, circle fitting is carried out on the tread base point data, and a fitting circle with the minimum fitting error is selected as a circle where the tread base point is located, so that the rolling circle diameter D, the central coordinate of the rolling circle diameter D and the corresponding vehicle speed v are obtained;
step six: acquisition of rolling circle run-out value
a) Obtaining the coordinates of the base points of the tread at different moments according to the vehicle speed v obtained in the step five;
b) calculating the distance from the tread base point at different moments to the center of the rolling circle according to the central coordinate of the rolling circle obtained in the step five and the coordinates of the tread base point at different moments in the step three;
c) subtracting the radius of the rolling circle according to the obtained distance from the tread base point to the center of the rolling circle at different moments to obtain the radial run-out value of the rolling circle;
step seven: obtaining of inner side distance and equivalent taper
The distance between the rail eddy current sensors (2) on the two sides is calibrated to obtain the inner side distance of the wheel pair, and then the equivalent taper is calculated according to the standard of the railway industry;
step eight: perfecting data management application functions
The method comprises the following steps of (1) recording the date, the number, the axial position and the wheel number of a vehicle by combining a vehicle number identification device;
function 2, can calculate the diameter difference of the same axle, with the diameter difference of the bogie, with the diameter difference of the car, through inputting the threshold value, realize the alarm of the out-of-tolerance;
function 4, through the measurement of a certain time, can calculate the speed and trend of wearing and tearing, predict and wear out the time of the out-of-tolerance, guide the maintenance work of the wheel cake;
function 5, can interface with vehicle section management system, realize the data sharing, bring the wheel cake measuring system into the vehicle section management system;
function 6, printout.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (1)
1. A rail vehicle wheel cake parameter on-line measuring device and method is characterized in that: the specific measurement method is as follows:
the method comprises the following steps: mounting of an on-line measuring device
The 2D laser displacement sensor (1) is arranged on the outer side of the track through a support, the eddy current sensor (2) is arranged on the inner side of the track and faces and is perpendicular to the inner end face of the wheel cake, and in addition, the magnetic steel (3) is arranged on the inner side of the track;
the 2D laser displacement sensor (1) and the eddy current sensor (2) are used for measuring a wheel cake tread curve, the diameter of a rolling circle and the jumping of the rolling circle;
the eddy current sensor (2) is used for measuring the inside distance;
the magnetic steel (3) is used for obtaining a starting signal to enable the wheel cake measuring system to enter a standby state, the magnetic steel (3) does not obtain a signal after the set time, and the system is in standby;
the track comprises a T-shaped track and a groove-shaped track, the eddy current sensor (2) faces and is perpendicular to the inner end face of the wheel cake, the eddy current sensor (2) is upward perpendicular to the ground, the 2D laser displacement sensor (1) and the eddy current sensor (2) are fixedly arranged on the same support, and the relative spatial positions are fixed and known;
the included angle between the laser emission plane A of the 2D laser displacement sensor (1) and the plane B perpendicular to the track is alpha, and the included angle between the laser central line of the 2D laser displacement sensor (1) and the perpendicular plane C parallel to the track is beta;
step two: establishing a coordinate system
Coordinate system 1: in the plane A, the original coordinate system of the 2D laser displacement sensor (1) is provided, the intersection line of the emission window plane of the 2D laser displacement sensor (1) and the plane A is an x axis, and the laser emission direction of the 2D laser displacement sensor (1) is a y axis;
coordinate system 2: in the plane A, a horizontal plane parallel to the rail is called a plane D, the intersecting line of the plane A and the plane D is an x axis, and the intersecting line vertical to the x axis is a y axis;
coordinate system 3: in plane C, parallel to the rails is the x-axis and perpendicular to the rails is the y-axis;
step three: obtaining wheel cake tread curve
a) When the wheel cake rolls through the magnetic steel (3), the system enters a standby state, and when the wheel cake rolls to be close to the 2D laser displacement sensor (1) and the eddy current sensor (2), the 2D laser displacement sensor (1) and the eddy current sensor (2) start to measure and obtain multiple groups of data at different moments;
b) carrying out coordinate conversion on the data obtained in the step 1 to obtain data in a coordinate system 2;
c) performing curve fitting on each group of scattered point data at different moments in a coordinate system 2 to obtain a plurality of wheel cake tread curves at different moments;
d) calculating the height of the wheel rim according to the standard of the railway industry for each wheel cake tread curve at different moments, selecting three curves with the minimum height of the wheel rim, and carrying out average processing on the three curves to obtain a final wheel cake tread curve;
step four: obtaining characteristic value of wheel cake tread curve
Calculating the obtained wheel cake tread curve according to the railway industry standard to obtain data of the height of the wheel rim, the thickness of the wheel rim and the width of the wheel rim;
step five: obtaining the diameter of the rolling circle of the wheel cake
a) Finding a tread base point P on each wheel cake tread curve0、P1、……..PiAnd obtaining the height coordinate y of the tread base point at different moments in the coordinate system 3 through coordinate conversioni；
b) And assuming that the running speed of the vehicle is v and the sampling time interval of the 2D laser displacement sensor (1) is t, the transverse coordinates of the base point of the tread at different moments in the step 1 are xi+itv；
c) Each tread base point is supposed to be on the same circle in the coordinate system 3, therefore, different vehicle running speeds v are input, circle fitting is carried out on the tread base point data, and a fitting circle with the minimum fitting error is selected as a circle where the tread base point is located, so that the rolling circle diameter D, the central coordinate of the rolling circle diameter D and the corresponding vehicle speed v are obtained;
step six: acquisition of rolling circle run-out value
a) Obtaining the coordinates of the base points of the tread at different moments according to the vehicle speed v obtained in the step five;
b) calculating the distance from the tread base point at different moments to the center of the rolling circle according to the central coordinate of the rolling circle obtained in the step five and the coordinates of the tread base point at different moments in the step three;
c) subtracting the radius of the rolling circle according to the obtained distance from the tread base point to the center of the rolling circle at different moments to obtain the radial run-out value of the rolling circle;
step seven: obtaining of inner side distance and equivalent taper
The distance between the eddy current sensors (2) on the inner sides of the two rails is calibrated to obtain the distance between the inner sides of the wheel pairs, and then the equivalent taper is calculated according to the standard of the railway industry;
step eight: perfecting data management application functions
The method comprises the following steps of (1) recording the date, the number, the axial position and the wheel number of a vehicle by combining a vehicle number identification device;
function 2, can calculate the diameter difference of the same axle, with the diameter difference of the bogie, with the diameter difference of the car, through inputting the threshold value, realize the alarm of the out-of-tolerance;
function 3, by inputting the wheel rim height, the wheel rim thickness, the rolling circle diameter, the inner side distance and the threshold value of the equivalent taper, the out-of-tolerance alarm is realized;
function 4, through the measurement of a certain time, can calculate the speed and trend of wearing and tearing, predict and wear out the time of the out-of-tolerance, guide the maintenance work of the wheel cake;
function 5, can interface with vehicle section management system, realize the data sharing, bring the wheel cake measuring system into the vehicle section management system;
function 6, printout.
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| CN109974605A (en) * | 2019-03-14 | 2019-07-05 | 赵若群 | A kind of railway vehicle wheel cake Parameter Measuring device and method |
| CN112429033B (en) * | 2019-08-25 | 2023-09-29 | 北京镭格之光测量技术有限公司 | Online measuring device and method for wheel cake parameters of railway vehicle |
| CN113624140A (en) * | 2020-07-27 | 2021-11-09 | 北京镭格之光测量技术有限公司 | Online measuring device and method for wheel cake parameters of railway vehicle |
| CN112129258B (en) * | 2020-08-24 | 2022-07-26 | 中车唐山机车车辆有限公司 | Scratch depth measuring method |
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