CN105835901B - A kind of method and its system of the detection of train wheel diameter - Google Patents
A kind of method and its system of the detection of train wheel diameter Download PDFInfo
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- CN105835901B CN105835901B CN201610361653.1A CN201610361653A CN105835901B CN 105835901 B CN105835901 B CN 105835901B CN 201610361653 A CN201610361653 A CN 201610361653A CN 105835901 B CN105835901 B CN 105835901B
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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 the methods and its system of a kind of detection of train wheel diameter, time series when one group of train wheel passes through is received by Laser emission and reception device, in conjunction with field erected installation parameter, instantaneous velocity when wheel passes through is calculated first, the chord length that laser streaks on wheel is being calculated by speed, is calculating wheel diameter finally by respective algorithms.The present invention need to only use two Laser emission reception devices, largely save cost；Not needing additional vehicle speed detector device can be obtained the instantaneous velocity of train；Two Laser emission reception devices independently calculate wheel diameter, and are averaging to result, can greatly reduce error.
Description
Technical field
The invention belongs to rail vehicle on-line monitoring technique field, the method for especially a kind of train wheel diameter detection and
Its system.
Background technique
In urban track traffic, wheel is one of the maximum component of loss in EEF bogie.The state and train of wheel
Safe operation it is closely related, if size of the train operation to wheel has strict requirements, use undesirable set of wheel meeting
Make to jolt in train operation the even safety accidents such as derailing.Wherein wheel diameter as wheel condition important indicator it
One, have a great impact to safe train operation.It therefore, is very necessary to the detection of wheel diameter.
Currently, the mode of manual measurement is also widely used at present in wheelset profile context of detection.Manual measurement uses wheel footpath
Ruler is had substantial connection by artificial dynamics, the proficiency of worker's measurement and field condition in measurement process, and manual measurement is deposited
In biggish error.On the other hand, larger using manual measurement mode time-consuming since train wheel number is more, overhaul efficiency
It is extremely low.
In recent years, with the development of laser and image technique, there is a collection of contactless wheel calipers and side
Method.As Chinese patent CN1899904A (detector for train wheel pair size online test method and device) utilizes four laser based on PSD
Displacement sensor obtains train wheel end face to the distance of laser detector, then calculates wheel rim thickness, wheel rim height, wheel footpath value.
Laser sensor needed for this method is expensive, more stringent to setting angle, is unfavorable for large-scale promotion use.
Summary of the invention
The purpose of the present invention is to provide a kind of layings of structure conveniently, calculating speed is fast, the accurate train vehicle of measurement result
The detection method and its system of wheel diameter.
The technical solution for realizing the aim of the invention is as follows: a kind of method and its system of the detection of train wheel diameter, packet
Include following steps:
Step 1, sensor is laid: along train direction of advance, two laser beam emitting devices are installed in side in orbit, respectively
It is denoted as S1, S2, two laser beam emitting devices are on same straight line and are parallel to track extending direction, laser beam emitting device transmitting
The vertical direction that extends along track of laser by the inside of track on the outside of directive track；Two laser are successively installed to connect on the outside of track
Receiving apparatus is denoted as R1, R2, and two laser receivers are in the same vertical plane and the vertical plane is parallel to track extension side
To R1 receives the laser that S1 is issued, and R2 receives the laser that S2 is issued；S1, S2 transmitting laser with perpendicular to track extending direction
The horizontal line angle in place face is respectively α1、α2, laser beam emitting device S1, S2 are between same level height and laser beam
Spacing is L, and the height where laser beam emitting device S1, S2 guarantees the peace of laser transmitting set and train lower than orbit plane
Entirely；
Step 2, the acquisition of installation parameter: placing a wheel pair for calibration in orbit, obtains the laser of S1 transmitting
The hot spot left on wheel medial surface to track upper surface horizontal plane height be H1, the laser of S2 transmitting is on the inside of wheel
The hot spot left on face to track upper surface horizontal plane height be H2；
Step 3, sensing data obtains: when wheel passes through, laser receiver R1, R2 can be undergone respectively " to be led
The state of logical --- cut-off --- conducting ", at the time of laser receiver records each state change, each wheel can be obtained
One group of time series being made of four time datas；
Step 4, car speed obtains: when train is by the position of laser sensor installation in step 1, being sent out according to laser
Data at the time of when the spacing L and state change of injection device S1, S2 obtain instantaneous velocity when wheel passes through equipment；
Step 5, wheel diameter obtains: the train instantaneous velocity obtained according to step 4, at the time of when passing through in conjunction with wheel,
It obtains laser and beats the chord length on wheel, so that wheel diameter be calculated.
Compared with prior art, the present invention its remarkable advantage: (1) need to only use two Laser emission reception devices, largely
Save cost；(2) not needing additional vehicle speed detector device can be obtained the instantaneous velocity of train；(3) two Laser emissions connect
Receiving apparatus independently calculates wheel diameter, and is averaging to result, can greatly reduce error；(4) have online non-contact
The advantages that formula measures, to realize that wheel diameter on-line measurement provides a kind of higher solution of accuracy.
Present invention is further described in detail with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is the flow chart of wheel diameter detection method of the present invention.
Fig. 2 is the sensor scheme of installation of wheel diameter detection of the present invention.
Fig. 3 is the sensor artwork of wheel diameter detection of the present invention.
Fig. 4 is the sensor installation sectional view of wheel diameter detection of the present invention.
Fig. 5 is wheel moment sequence diagram of the present invention.
Fig. 6 is diameter calculation principle explanatory diagram.
Specific embodiment
In conjunction with Fig. 1, the method for train wheel diameter detection of the present invention, comprising the following steps:
Step 1, sensor is laid: as shown in Fig. 2, two laser hairs are installed in side in orbit along train direction of advance
Injection device is denoted as S1, S2 respectively, and two laser beam emitting devices are on same straight line and are parallel to track extending direction, laser
The laser of emitter transmitting is along the vertical direction that track extends by directive track outside on the inside of track；Successively pacify on the outside of track
Two laser receivers are filled, are denoted as R1, R2, two laser receivers are in the same vertical plane and the vertical plane is parallel to
Track extending direction, R1 receive the laser that S1 is issued, and R2 receives the laser that S2 is issued；S1, S2 transmitting laser with perpendicular to rail
The horizontal line angle in face is respectively α where road extending direction1、α2, as shown in figure 3, laser beam emitting device S1, S2 are in same water
Spacing between flat height and laser beam is L, and the height where laser beam emitting device S1, S2 is lower than orbit plane to guarantee laser
Emit the safety of equipment and train.
The laser beam emitting device is made of modulating-coding and laser emitter, laser receiver by laser pickoff,
Amplification detector and modem composition, the laser that modulating coder modulates certain frequency are issued by laser emitter；When
When laser pickoff receives laser, it can be parsed by frequency of the laser demodulator to laser, when laser frequency meets
It records at the time of start to irradiate and terminate irradiation, if laser frequency does not meet condition of acceptance, illustrates that the light is noise or dry
It disturbs, is filtered out.Above-mentioned laser " receiving --- judgement --- record " the process used time is within 30 microseconds to guarantee diameter measurement
Precision.
The distance between described laser beam emitting device S1, S2 L should meet: 840mm < L < 3140mm, i.e. L should be greater than standard wheels
Pair diameter value (840mm), prevent S1 and S2 transmitting laser beat the situation on wheel simultaneously, cause between laser
The confusion of interference and time series, and L should be less than the diameter value of wheel base (2300mm) and standard wheels pair of bogie
(840mm) and value makes not having the detection zone that another wheel enters S1 during a wheel measurement.
Step 2, the acquisition of installation parameter: as shown in figure 4, placing a wheel pair for calibration in orbit, S1 is obtained
The hot spot that the laser of transmitting leaves on wheel medial surface to track upper surface horizontal plane height be H1, the laser of S2 transmitting
The hot spot left on wheel medial surface to track upper surface horizontal plane height be H2.Laser beam and horizontal sextant angle α1、α2It answers
Meet: the laser irradiation of S1, S2 transmitting is on the inside of wheel, and facular height is lower than the wheel center of circle, higher than rail level and will not be irradiated to
On the brake block of wheel and other vehicle bottom devices.Wheel medial surface are as follows: it is parallel with the plummet face where the center line of track, to
Face where translation 70mm on the inside of track.
Step 3, sensing data obtains: as shown in figure 5, when wheel passes through, laser receiver R1, R2 can be passed through respectively
The state for going through " conducting --- cut-off --- conducting ", at the time of laser receiver records each state change, each wheel
It can obtain one group of time series being made of four time datas.Time series has the following four moment successively to constitute: 1. R1 by
T at the time of " conducting --- cut-off "1；2. R1 is by t at the time of " cut-off --- conducting "2；3. R2 is by " conducting --- cut-off "
t3；4. R2 is by t at the time of " cut-off --- conducting "4。
Step 4, car speed obtains: when train is by the position of laser sensor installation in step 1, being sent out according to laser
Data at the time of when the spacing L and state change of injection device S1, S2 obtain instantaneous velocity when wheel passes through equipment.Wherein
Instantaneous velocity when wheel passes through is calculated by the following steps:
Step 1 obtains the distance between laser beam emitting device S1, S2 L according to step 1；
Step 2 obtains t at the time of wheel starts to block S1 according to step 31With t at the time of starting to block S23And S1,
Distance L acquires an Instantaneous velocity values V between S2 laser beam1；T at the time of leaving S1 according to wheel2With t at the time of leaving S24,
And distance L acquires an Instantaneous velocity values V between S1, S2 laser beam2, in which:
Step 3, to speed V1、V2Averaging, it is flat during S1 walks out S2 range to the end from starting to block to obtain the wheel
Equal speed
Step 5, wheel diameter obtains: the train instantaneous velocity obtained according to step 4, at the time of when passing through in conjunction with wheel,
It obtains laser and beats the chord length on wheel, so that wheel diameter be calculated.The acquisition methods of the wheel diameter are as follows:
Step 1, according to step 4 obtain wheel by when average speed
Step 2 obtains t at the time of wheel starts to block S1 according to step 31With t at the time of leaving S12, S1 is acquired in wheel
On a chord length l streaking1；T at the time of wheel starts to block S2 is obtained according to step 33With t at the time of leaving S24, acquire S2
The chord length l streaked on wheel2, in which:
Step 3, if wheel rim vertex radius of circle is R, wheel rim height is known as h, acquires S1 laser and streak on wheel medial surface
The trajectory distance wheel center of circle vertical height be R-H1- h can acquire wheel rim apex circle one by chord length by Pythagorean theorem
Radius R1, the high h of wheel rim that twice of wheel rim vertex circular diameter subtracts twice again acquires wheel diameter r1, that is, pass through Pythagorean theorem
Acquire a wheel rim apex circle radius value of wheel are as follows:
The high h of wheel rim that twice of wheel rim vertex circular diameter subtracts twice again acquires wheel diameter r1
Similarly, the vertical height in the trajectory distance wheel center of circle that S2 laser streaks on wheel medial surface is R-H2- h, by
Chord length acquires another radius of wheel rim apex circle R by Pythagorean theorem2, twice of wheel rim vertex circular diameter subtracts twice of wheel again
The high h of edge can be in the hope of wheel diameter r2, that is, pass through Pythagorean theorem
Acquire another wheel rim vertex radius of circle of wheel are as follows:
The high h of wheel rim that twice of wheel rim vertex circular diameter subtracts twice again acquires wheel diameter r2:
Step 4 since Error weight is identical twice, therefore takes the average value measured twice finally to measure knot as wheel diameter
Fruit.Obtain in step 3 two wheel diameter values are averaging and reduce error, average value is as train wheel diameter r:
In conjunction with Fig. 2, Fig. 3 and Fig. 4, the device of train wheel diameter detection of the present invention, including two with central processing unit
A laser beam emitting device and laser receiver, along train direction of advance, two laser beam emitting devices are installed in side in orbit,
It is denoted as S1, S2 respectively, two laser beam emitting devices are on same straight line and are parallel to track extending direction, laser beam emitting device
The laser of transmitting is along the vertical direction that track extends by directive track outside on the inside of track；Two are successively installed on the outside of track to swash
Optical receiver apparatus is denoted as R1, R2, and two laser receivers are in the same vertical plane and the vertical plane is parallel to track extension
Direction, R1 receive the laser that S1 is issued, and R2 receives the laser that S2 is issued；S1, S2 transmitting laser with perpendicular to track extension side
It is respectively α to the horizontal line angle in place face1、α2, laser beam emitting device S1, S2 are between same level height and laser beam
Spacing be L, height where laser beam emitting device S1, S2 guarantees the peace of laser transmitting set and train lower than orbit plane
Entirely；
A wheel pair for calibration is placed in orbit, obtains the light that the laser of S1 transmitting leaves on wheel medial surface
Spot to track upper surface horizontal plane height be H1, on the hot spot to track that is left on wheel medial surface of laser of S2 transmitting
Surface horizontal plane height is H2；
When wheel passes through, laser receiver R1, R2 can undergo the state of " conducting --- cut-off --- conducting " respectively,
At the time of laser receiver records each state change, when each wheel can obtain one group be made of four time datas
Between sequence；
The central processing unit includes that car speed obtains module and wheel diameter acquisition module, is obtained in car speed
In module, when the position that train is installed by laser sensor, according to the spacing L and state of laser beam emitting device S1, S2
Data at the time of when variation obtain instantaneous velocity when wheel passes through equipment；It is obtained in module in wheel diameter, according to train wink
Shi Sudu at the time of when passing through in conjunction with wheel, obtains laser and beats the chord length on wheel, so that wheel diameter be calculated.
The present invention is described in further details combined with specific embodiments below
Embodiment
In conjunction with Fig. 3 and Fig. 4, four laser beam emitting devices are successively installed in side in orbit, and launcher position is apart from track
Inside is 0.45m, and angle [alpha] is 36 °, surveys the distance between the laser beam of laser beam emitting device S1, S2 L1For 1.202m.S1's
Height H of the hot spot in medial surface1Height H of the hot spot of=215mm, S2 in medial surface2=213mm, the wheel rim of wheel are a height of
Know, h=29.3mm.
According to the method for step 3, it is specified that speed is 5km/h by equipment, pass through the time sequence of the available train of equipment
Column.One of sequence is taken to carry out calculating demonstration: t1=1.076s；t2=1.644s；t3=1.942s；t4=2.508s.
The instantaneous velocity of train is calculated in conjunction with the numerical value of L according to method in step 4 are as follows:
According to method in step 5, brings the speed of the train measured in step 3 into radiuscope and calculate formula, this can be measured
The wheel rim vertex circular diameter of wheel is 881.1878mm, wheel diameter 822.5878mm.The people of this wheel diameter calculated
Work measured value is 822.6mm, it is seen that this method effectively can accurately measure wheel diameter.
Claims (9)
1. a kind of method of train wheel diameter detection, it is characterised in that the following steps are included:
Step 1, sensor is laid: along train direction of advance, two laser beam emitting devices are installed in side in orbit, are denoted as respectively
S1, S2, two laser beam emitting devices are on same straight line and are parallel to track extending direction, and laser beam emitting device transmitting swashs
Light is along the vertical direction that track extends by directive track outside on the inside of track；Two laser pick-off dresses are successively installed on the outside of track
It sets, is denoted as R1, R2, two laser receivers are in the same vertical plane and the vertical plane is parallel to track extending direction, R1
The laser that S1 is issued is received, R2 receives the laser that S2 is issued；The laser of S1, S2 transmitting with perpendicular to face where track extending direction
Horizontal line angle be respectively α1、α2, the spacing that laser beam emitting device S1, S2 are between same level height and laser beam is
L, the height where laser beam emitting device S1, S2 guarantee the safety of laser transmitting set and train lower than orbit plane；
Step 2, the acquisition of installation parameter: placing a wheel pair for calibration in orbit, obtains the laser of S1 transmitting in vehicle
On wheel medial surface the hot spot that leaves to track upper surface horizontal plane height be H1, the laser of S2 transmitting is on wheel medial surface
The hot spot left to track upper surface horizontal plane height be H2；
Step 3, sensing data obtain: when wheel passes through, laser receiver R1, R2 can undergo respectively " conducting --- cut
Only --- conducting " state, at the time of laser receiver records each state change, when each wheel can be obtained by four
Carve one group of time series of data composition；
Step 4, car speed obtains: when train is by the position of laser sensor installation in step 1, being filled according to Laser emission
Data at the time of when setting the spacing L and state change of S1, S2, obtain instantaneous velocity when wheel passes through equipment；
Step 5, wheel diameter obtains: the train instantaneous velocity obtained according to step 4 at the time of when passing through in conjunction with wheel, obtains
Laser beats the chord length on wheel, so that wheel diameter be calculated.
2. according to the method described in claim 1, it is characterized in that laser beam emitting device is by modulating coder and swashs in step 1
Optical transmitting set composition, laser receiver are made of laser pickoff, amplification detector and modem, modulating coder tune
The laser for producing certain frequency is issued by laser emitter；When laser pickoff receives laser, laser demodulator can be passed through
The frequency of laser is parsed, recorded when laser frequency meets start irradiate and terminate irradiation at the time of, if laser frequency
Rate does not meet condition of acceptance, illustrates that the light is noise or interference, is filtered out；Above-mentioned laser " receives --- judgement --- note
Record " the process used time guarantees the precision of diameter measurement within 30 microseconds.
3. according to the method described in claim 1, it is characterized in that the distance between laser beam emitting device S1, S2 in step 1 L
Should meet: 840mm < L < 3140mm, i.e. L should be greater than the diameter value of standard wheels pair, and it is same to prevent the laser that S1 and S2 emits
When beat the situation on wheel, cause the interference between laser and the confusion of time series, and L should be less than the antero posterior axis of bogie
Away from the diameter value with standard wheels pair and value makes not having the detection zone that another wheel enters S1 during a wheel measurement
Domain.
4. according to the method described in claim 1, it is characterized in that laser beam in step 2 and horizontal sextant angle α1、α2It should meet:
The laser irradiation of S1, S2 transmitting is on the inside of wheel, and facular height is lower than the wheel center of circle, higher than rail level and will not be irradiated to wheel
On brake block and other vehicle bottom devices.
5. according to the method described in claim 1, it is characterized in that wheel medial surface in step 2 are as follows: the center line with track
The plummet face at place is parallel, to face where track inside translation 70mm.
6. according to the method described in claim 1, it is characterized in that the time series in step 3 has following four moment successively structure
At: 1. R1 is by t at the time of " conducting --- cut-off "1；2. R1 is by t at the time of " cut-off --- conducting "2；3. R2 by " conducting --- cut
T at the time of only "3；4. R2 is by t at the time of " cut-off --- conducting "4。
7. according to the method described in claim 1, it is characterized in that the instantaneous velocity when wheel in step 4 passes through is by following step
Suddenly it is calculated:
Step 1 obtains the distance between laser beam emitting device S1, S2 L according to step 1；
Step 2 obtains t at the time of wheel starts to block S1 according to step 31With t at the time of starting to block S23And S1, S2 swash
Distance L acquires an Instantaneous velocity values V between light beam1；T at the time of leaving S1 according to wheel2With t at the time of leaving S24, and
Distance L acquires an Instantaneous velocity values V between S1, S2 laser beam2, in which:
Step 3, to speed V1、V2It averages and obtains the wheel from starting to block the average speed during S1 walks out S2 range to the end
Degree
8. according to the method described in claim 7, it is characterized in that the acquisition methods of the wheel diameter in step 5 are as follows:
Step 1, according to step 4 obtain wheel by when average speed
Step 2 obtains t at the time of wheel starts to block S1 according to step 31With t at the time of leaving S12, acquire S1 and drawn on wheel
The chord length l crossed1；T at the time of wheel starts to block S2 is obtained according to step 33With t at the time of leaving S24, S2 is acquired in vehicle
The chord length l streaked on wheel2, in which:
Step 3, if wheel rim vertex radius of circle is R, wheel rim height is known as h, acquires the rail that S1 laser streaks on wheel medial surface
Vertical height of the mark apart from the wheel center of circle is R-H1- h can acquire one radius of wheel rim apex circle by chord length by Pythagorean theorem
R1, the high h of wheel rim that twice of wheel rim vertex radius of circle subtracts twice again acquires wheel diameter r1, that is, pass through Pythagorean theorem
Acquire a wheel rim apex circle radius value of wheel are as follows:
The high h of wheel rim that twice of wheel rim vertex radius of circle subtracts twice again acquires wheel diameter r1
Similarly, the vertical height in the trajectory distance wheel center of circle that S2 laser streaks on wheel medial surface is R-H2- h is led to by chord length
It crosses Pythagorean theorem and acquires another radius of wheel rim apex circle R2, twice of wheel rim vertex radius of circle subtracts twice of the high h of wheel rim again
It can be in the hope of wheel diameter r2, that is, pass through Pythagorean theorem
Acquire another wheel rim vertex radius of circle of wheel are as follows:
The high h of wheel rim that twice of wheel rim vertex radius of circle subtracts twice again acquires wheel diameter r2:
Obtain in step 3 two wheel diameter values are averaging and reduce error by step 4, and average value is as wheel diameter r:
9. a kind of system of train wheel diameter detection, it is characterised in that including the two laser hair being connect with central processing unit
Injection device and laser receiver, along train direction of advance, two laser beam emitting devices are installed in side in orbit, are denoted as respectively
S1, S2, two laser beam emitting devices are on same straight line and are parallel to track extending direction, and laser beam emitting device transmitting swashs
Light is along the vertical direction that track extends by directive track outside on the inside of track；Two laser pick-off dresses are successively installed on the outside of track
It sets, is denoted as R1, R2, two laser receivers are in the same vertical plane and the vertical plane is parallel to track extending direction, R1
The laser that S1 is issued is received, R2 receives the laser that S2 is issued；The laser of S1, S2 transmitting with perpendicular to face where track extending direction
Horizontal line angle be respectively α1、α2, the spacing that laser beam emitting device S1, S2 are between same level height and laser beam is
L, the height where laser beam emitting device S1, S2 guarantee the safety of laser transmitting set and train lower than orbit plane；
A wheel pair for calibration is placed in orbit, and the hot spot that the laser of acquisition S1 transmitting leaves on wheel medial surface arrives
Track upper surface horizontal plane height is H1, the hot spot that is left on wheel medial surface of laser of S2 transmitting to track upper surface
Horizontal plane height is H2；
When wheel passes through, laser receiver R1, R2 can undergo the state of " conducting --- cut-off --- conducting ", laser respectively
At the time of reception device records each state change, each wheel can obtain one group of time sequence being made of four time datas
Column；
The central processing unit includes that car speed obtains module and wheel diameter acquisition module, obtains module in car speed
In, when the position that train is installed by laser sensor, according to the spacing L and state change of laser beam emitting device S1, S2
When at the time of data, obtain instantaneous velocity when wheel passes through equipment；It is obtained in module in wheel diameter, it is instantaneously fast according to train
Degree, at the time of when passing through in conjunction with wheel, obtains laser and beats the chord length on wheel, so that wheel diameter be calculated.
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| CN107941159A (en) * | 2017-12-18 | 2018-04-20 | 长春工业大学 | A kind of electronic type spherical parts apparatus for detecting diameter and method |
| CN110962887B (en) * | 2018-09-28 | 2021-09-03 | 比亚迪股份有限公司 | Train control system and method and train |
| CN110356431A (en) * | 2019-06-24 | 2019-10-22 | 广州微易轨道交通科技有限公司 | Method for detecting out-of-roundness of train wheel |
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| FR2541019B1 (en) * | 1983-02-10 | 1986-07-18 | Mecelec Sa | OPTICAL METHOD FOR DETERMINING THE DIMENSIONS OF A RELATIVE MOVING OBJECT, AND MORE PARTICULARLY A COIN IN A PRE-PAYMENT APPARATUS, AND DEVICE FOR IMPLEMENTING IT |
| FR2843453B1 (en) * | 2002-08-08 | 2004-11-05 | Regie Autonome Transports | METHOD AND DEVICE FOR DETERMINING THE DIAMETER OF A SUBSTANTIALLY CYLINDRICAL OBJECT |
| DE102004012167B4 (en) * | 2004-03-09 | 2011-07-07 | Siemens AG, 80333 | Method for determining the wheel diameter of wheels of rail vehicles, in particular freight wagons, and a gravity drainage system using the method |
| CN100396529C (en) * | 2005-07-20 | 2008-06-25 | 广州复旦奥特科技股份有限公司 | Online detection mthod and device for train wheel pair size |
| CN1330927C (en) * | 2005-10-26 | 2007-08-08 | 武汉理工大学 | Optical projection measurer for external diameter of large wheel diameter |
| CN104228875B (en) * | 2014-09-30 | 2017-01-11 | 南京理工大学 | Method and device for online detection of size of city rail train wheel set |
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