CN106225710A - Train Wheel tread three-D profile automatic measurement method and system based on error correction - Google Patents

Abstract

The invention provides Train Wheel tread three-D profile automatic measurement method based on error correction, comprise the following steps: obtain the discrete point set of the tread wheel rim of Train Wheel different cross section；Discrete point set is fitted to respectively integrity profile curve；Obtain the distance values of wheel rim top and sensor platform, and revise the height error of specified point on the wheel rim and tread that rolling circle radius change brings；Solving respectively and obtain the tread radius of specified point on each integrity profile curve, specified point is equal to wheel rim end face distance；Three-dimensional system of coordinate is set up for initial point, the three-dimensional coordinate array of the specified point being calculated in a series of tread rolling circumference with the center of circle of specified point place rolling circle；Integrity profile curve matching corresponding for three-dimensional coordinate array is obtained the integrity profile of tread.The Train Wheel tread three-D profile automatic measurement method and system based on error correction that the present invention provides, it is possible to measure the profile of Railway wheelset tread, and can measure error correction, certainty of measurement is high.

Description

Train Wheel tread three-D profile automatic measurement method and system based on error correction

Technical field

The present invention relates to a kind of Train Wheel tread three-D profile automatic measurement method and system based on error correction, especially It relates to a kind of method and system measuring Railway wheelset diameter by choosing laser signal-noise ratio optimum.

Background technology

Railway wheelset periphery is made up of with tread two function curved surface wheel rim, and tread contacts with rail and realizes Inhaul operation, It is provided commonly for guiding with wheel rim.Therefore, wheel all can produce abrasion, only to the surface portion contacted with rail generation on periphery The circular arc on wheel rim top is the part not contacted with rail, there are not abrasion, and is in operation and is always maintained at stable dimensioning Very little.The diameter of wheel rim is the size that Train Wheel is critically important, and prior art is to use Train Wheel footpath chi to Railway wheelset by artificial Diameter is measured or is detected by Railway wheelset physical dimension on-line measurement system, and the certainty of measurement in wheel footpath all exists 0.5mm。

Summary of the invention

Based on above not enough, the technical problem to be solved in the present invention is to provide a kind of Train Wheel tread based on error correction Three-D profile automatic measurement method and system, it is possible to measure the profile of Railway wheelset tread, and error correction can be measured, Certainty of measurement is high.

In order to solve above technical problem, present invention employs techniques below scheme:

A kind of Train Wheel tread three-D profile automatic measurement method based on error correction, comprises the following steps:

(1) discrete point set of the tread wheel rim of Train Wheel different cross section is obtained；

(2) described discrete point set is fitted to integrity profile curve respectively；

(3) obtain the distance values of wheel rim top and sensor platform, and revise wheel rim that rolling circle radius change brings and The height error of the specified point on tread；

(4) solving respectively and obtain the tread radius of specified point on each integrity profile curve, described specified point is to wheel acies Identity distance is from equal；

(5) three-dimensional system of coordinate is set up for initial point in the center of circle with specified point place rolling circle, is calculated the rolling of a series of tread The three-dimensional coordinate array of the specified point on dynamic circumference；

(6) integrity profile curve matching corresponding for three-dimensional coordinate array is obtained the integrity profile of tread.

The discrete point set of the tread wheel rim of described acquisition Train Wheel different cross section includes:

(11) coordinate of the tread wheel rim of Train Wheel different cross section is obtained；

(12) described coordinate is fused into discrete point set.

The coordinate of the tread wheel rim of described acquisition Train Wheel different cross section includes:

It is respectively provided with laser displacement sensor near the tread of Train Wheel and the position of wheel rim in orbit, enters from Train Wheel Entering laser displacement sensor effective range and stop to leaving laser displacement sensor effective range, two laser displacements pass Sensor synchronizes to obtain the own coordinate system coordinate of the tread wheel rim of Train Wheel different cross section respectively；

Described own coordinate system Coordinate Conversion is become middle coordinate system coordinate.

Described middle coordinate system coordinate is become to include described own coordinate system Coordinate Conversion:

Set up own coordinate and be tied to the transformational relation of middle coordinate system；

It is middle coordinate system coordinate according to described transformational relation by own coordinate system Coordinate Conversion.

Described described discrete point set fitted to integrity profile curve respectively include:

Discrete point sectional is fitted to sectional curve；

Described subsection curve drafting is become integrity profile curve.

A kind of Train Wheel tread three-D profile automatic measuring system based on error correction, including: discrete point set obtains Module, contour curve fitting module, error correction module, radius solve module, three-dimensional coordinate solves module and tread profile Fitting module, wherein,

Discrete point set acquisition module, for obtaining the discrete point set of the tread wheel rim of Train Wheel different cross section；

Contour curve fitting module, for fitting to integrity profile curve respectively by described discrete point set；

Error correction module, for obtaining the distance values on wheel rim top and sensor platform, and revises the change of rolling circle radius Change the height error of specified point on the wheel rim that brings and tread；

Radius solves module, obtains the tread radius of specified point on each integrity profile curve for solving respectively, described Specified point is equal to wheel rim end face distance；

Three-dimensional coordinate solves module, sets up three-dimensional system of coordinate for the center of circle with specified point place rolling circle for initial point, meter Calculate the three-dimensional coordinate array of the specified point obtained in a series of tread rolling circumference；

Tread contour fitting module, for obtaining the complete of tread by integrity profile curve matching corresponding for three-dimensional coordinate array Whole profile.

Described discrete point set acquisition module includes coordinate acquiring unit, coordinate integrated unit, wherein,

Coordinate acquiring unit, for obtaining the coordinate of the tread wheel rim of Train Wheel different cross section；

Coordinate integrated unit, is fused into discrete point set by described coordinate.

Described coordinate acquiring unit includes two laser displacement sensors and coordinate transformation unit,

Laser displacement sensor, is separately positioned on the inner side and outer side of described Train Wheel, and described laser displacement sensor divides Tong Bu not obtain the own coordinate system coordinate of the tread wheel rim of Train Wheel different cross section；

Coordinate transformation unit, becomes middle coordinate system coordinate by described own coordinate system Coordinate Conversion.

Described coordinate transformation unit includes,

Measurement model subelement, is tied to the transformational relation of middle coordinate system for setting up own coordinate；

Conversion subelement, for being middle coordinate system coordinate according to described transformational relation by own coordinate system Coordinate Conversion.

Described contour curve fitting module includes:

Subsection curve drafting unit, for fitting to sectional curve by discrete point sectional；

Contour curve fitting unit, for becoming integrity profile curve by described subsection curve drafting.

Using above technical scheme, the present invention achieves techniques below effect:

The Train Wheel tread three-D profile automatic measurement method and system based on error correction that the present invention provides, it is possible to Measure the rolling circle profile of the tread of train, it will thus be seen that the degree of wear of train tread, and measurement error can be carried out Revising, its certainty of measurement that can reach is taken turns physical dimension measurement technology and general maintenance wheel online higher than existing train The precision of technology is measured in footpath, and simple in construction is easy for installation.

Accompanying drawing explanation

Fig. 1 is the flow chart of present invention Train Wheel based on error correction tread three-D profile automatic measurement method；

Fig. 2 is that in present invention Train Wheel based on error correction tread three-D profile automatic measurement method, laser displacement passes Sensor position relative with Train Wheel top view；

Fig. 3 is that in present invention Train Wheel based on error correction tread three-D profile automatic measurement method, laser displacement passes Sensor measures scope schematic diagram；

Fig. 4 is that in present invention Train Wheel based on error correction tread three-D profile automatic measurement method, laser displacement passes The perspective view of sensor；

Fig. 5 a and 5b is respectively present invention Train Wheel based on error correction tread three-D profile automatic measurement method Laser displacement sensor A and B is Coordinate Conversion schematic diagram；

Fig. 6 is stepping on after merging in present invention Train Wheel based on error correction tread three-D profile automatic measurement method The discrete point set schematic diagram of the profile of face and wheel rim；

Fig. 7 is by discrete point set in present invention Train Wheel based on error correction tread three-D profile automatic measurement method The integrity profile curve that matching is formed；

Fig. 8 is that in present invention Train Wheel based on error correction tread three-D profile automatic measurement method, tread radius is surveyed Amount geometry location illustraton of model；

Fig. 9 is specific on tread in present invention Train Wheel based on error correction tread three-D profile automatic measurement method The Coordinate Conversion schematic diagram of some ai point；

Figure 10 is the composition structure of present invention Train Wheel based on error correction tread three-D profile automatic measuring system Schematic diagram.

Detailed description of the invention

As Figure 1-Figure 5, present invention Train Wheel based on error correction tread three-D profile automatic measurement method bag Include following

Step:

S101: obtain the discrete point set of the tread wheel rim of Train Wheel different cross section；

Concrete, as in figure 2 it is shown, be respectively provided with laser displacement near the tread of Train Wheel and the position of wheel rim in orbit Sensor, wherein, the laser displacement sensor being numbered A is arranged in orbit near the position of wheel rim, is numbered the laser position of B Displacement sensor is arranged in orbit near the position of tread, and laser displacement sensor A and laser displacement sensor B together decides on Test surface is 45 ° with the inclination angle of track horizontal plane, it is also possible to for other angle.Fig. 3 is the projection of laser displacement sensor A and B Schematic diagram, laser displacement sensor A and B synchronizes the own coordinate system coordinate of fetching portion tread and wheel rim respectively, from Train Wheel The effective range entering laser displacement sensor A and B is stopped to the effective range leaving laser displacement sensor A and B, Two laser displacement sensors synchronize to obtain the own coordinate system coordinate of the tread wheel rim of Train Wheel different cross section respectively, described section Face is the cross section by wheel axis or the cross section being parallel to described wheel axis.

Laser displacement sensor based on laser triangulation principle, internal optical system by laser diode and CCD line Property sensing element composition, the laser that lasing light emitter is launched forms a laser band at tread and wheel rim, and its reflection light is at an angle Reflex to CCD linear response element, after the integrated circuit of sensor processes optical displacement data, obtain tread profile coordinate points. Measurement value sensor is displayed by X-Y datagram, and the most each point of measuring can export two values, and a value is in measuring Distance X of heart line, a value is distance Y from sensor lasing light emitter, and in Fig. 3, region C is having of laser displacement sensor A or B Effect measurement scope, wherein La is the least effective dose (LED) journey of horizontal X, and Le is the maximal effective dose journey of horizontal X, Lm be longitudinal Y Little useful range, Ln is the maximal effective dose journey of longitudinal Y.

Owing to sensor is installed on track both sides, the lateral displacement caused between the trip between wheel track, real-time full profile in addition Curve cannot overlap naturally with static criteria profile.Further, due to the installation site of two laser displacement sensors and horizontal plane And track all has a certain degree, the curve that the own coordinate system coordinate recorded is formed will necessarily produce distortion, therefore need to be to former The own coordinate system coordinate begun is corrected.As shown in figure 5a and 5b, the rectification to own coordinate system coordinate is rotated by coordinate Realize, rotated by coordinate and described own coordinate system Coordinate Conversion is become middle coordinate system coordinate.Concrete main by two steps Suddenly complete, first, set up own coordinate and be tied to the transformational relation model of middle coordinate system；Will be own further according to described transformational relation Coordinate system Coordinate Conversion is middle coordinate system coordinate.

Transformational relation model is as follows:

$\left\{\begin{array}{c}{u_n}^{\left(3\right)}=\sqrt{{x_n}^{{\left(3\right)}^2}+{y_n}^{{\left(3\right)}^2}}\sin (\mathrm{\θ}+{\mathrm{\β}}_3)={x_n}^{\left(3\right)}{\mathrm{cos\β}}_3+{y_n}^{\left(3\right)}{\mathrm{sin\β}}_3\\ {v_n}^{\left(3\right)}=\sqrt{{x_n}^{{\left(3\right)}^2}+{y_n}^{{\left(3\right)}^2}}\cos (\mathrm{\θ}+{\mathrm{\β}}_3)={y_n}^{\left(3\right)}{\mathrm{cos\β}}_3-{x_n}^{\left(3\right)}{\mathrm{sin\β}}_3\end{array}\right.$

$\left\{\begin{array}{c}{u_n}^{\left(4\right)}=\sqrt{{x_n}^{{\left(4\right)}^2}+{y_n}^{{\left(4\right)}^2}}\sin ({\mathrm{\θ}}^{\′}-{\mathrm{\β}}_4)={x_n}^{\left(4\right)}{\mathrm{cos\β}}_2-{y_n}^{\left(4\right)}{\mathrm{sin\β}}_2\\ {v_n}^{\left(4\right)}=\sqrt{{x_n}^{{\left(4\right)}^2}+{y_n}^{{\left(4\right)}^2}}\cos ({\mathrm{\θ}}^{\′}-{\mathrm{\β}}_4)={y_n}^{\left(4\right)}{\mathrm{cos\β}}_2+{x_n}^{\left(4\right)}{\mathrm{sin\β}}_2\end{array}\right.$

In formula, (x_n ⁽³⁾,y_n ⁽³⁾) it is the sensing point own coordinate system x in sensors A⁽³⁾o⁽³⁾y⁽³⁾On coordinate, (x_n ⁽⁴⁾, y_n ⁽⁴⁾) it is the sensing point own coordinate system x at sensor B⁽⁴⁾o⁽⁴⁾y⁽⁴⁾On coordinate, θ is sensing point and the y of sensors A⁽³⁾Axle Angle, θ ＇ is sensing point and the y of sensor 4⁽⁴⁾The angle of axle, (u_n ⁽³⁾,v_n ⁽³⁾) it is that the sensing point of sensor 3 is in middle coordinate It is u⁽³⁾o⁽³⁾v⁽³⁾Interior coordinate figure, (u_n ⁽⁴⁾,v_n ⁽⁴⁾) it is that the sensing point of sensor 4 is in middle coordinate system u⁽⁴⁾o⁽⁴⁾v⁽⁴⁾Interior seat Scale value.The sensing point detected by laser displacement sensor A and B obtains after the coordinate of own coordinate system is according to above-mentioned model conversion Sensing point is at the coordinate of middle coordinate system.

All can only detect the coordinate of the profile of part tread and wheel rim due to sensors A and B, therefore need will swash further The sensing point of Optical displacement sensor A and B merges at the coordinate of middle coordinate system, to obtain the profile of whole tread and wheel rim Discrete point set.Namely the sensing point of laser displacement sensor A and B is all transformed into benchmark seat at the coordinate of middle coordinate system In mark system.The fusion of coordinate is realized by coordinate Fusion Model.

Coordinate Fusion Model is as follows:

u_n=un⁽³⁾ u_n=u_n ⁽⁴⁾+Δu

v_n=v_n ⁽⁴⁾ v_n=v_n ⁽⁴⁾+Δu

(u in formula_n,v_n) it is that the sensing point of laser displacement sensor A and B is fused at benchmark at the coordinate of middle coordinate system Coordinate after coordinate system, u Δ is that the initial point of the middle coordinate system of laser displacement sensor B exists relative to the initial point of the frame of reference The axial skew of U, v Δ be the initial point of the middle coordinate system of laser displacement sensor B relative to the initial point of the frame of reference at V Axial skew.Frame of reference initial point overlaps with the middle coordinate system initial point of sensors A, therefore the middle coordinate of sensors A The initial point of system is 0 relative to the side-play amount of the initial point of the frame of reference.Tread after fusion and the discrete point set of the profile of wheel rim As shown in Figure 6.

S102: described discrete point set is fitted to integrity profile curve respectively；

Specifically, first discrete point sectional is fitted to sectional curve；Again described subsection curve drafting is become integrity profile Curve.

Curve shown in Fig. 7 is the integrity profile curve formed by discrete point set matching, and during due to Wheel Rail Contact, Train Wheel is leaned on There is not abrasion and deformation in nearly track one side end face and rail level, therefore on the integrity profile curve recorded, respective column wheel is near rail The linear feature of side, road endface position is the most obvious, this end face straight line is set to the first datum line l of wheel, from wheel rim end face It can also be other value that the point of 70mm is set to tread point a, a point to the distance of wheel rim end face, only illustrates at this, the definition of wheel footpath For a radius r for some a place circle, the summit of wheel rim is set to n point, and the radius that n point place is justified is R, a point and difference in height h of n point is Flange height.Complexity due to tread contour profile, it is difficult to a curve matching whole tread profile determined, thus the most right A range of discrete point carries out piecewise fitting and becomes sectional curve；Again described subsection curve drafting is become integrity profile curve, Thus improve the degree of accuracy that datum mark coordinate figure extracts.

S103: obtain the distance values on wheel rim top and sensor platform, and revise the wheel rim that rolling circle radius change is brought Height error with the specified point on tread；

Fig. 8 is tread radius measurement geometry location illustraton of model, obtains wheel rim top and biography by current vortex sensor platform Distance values H3 between sensor platform, revises the specified point a point on the wheel rim and tread brought due to the change of rolling circle radius The geometric error of the height value H1 of height value H2 and n point.

S104: solving respectively and obtain the tread radius of specified point on each integrity profile curve, described specified point is to wheel rim End face distance is equal；

The integrity profile curve obtained according to matching obtains some a, n accurate coordinates value in coordinate system uov, such that it is able to Drawing corresponding n point L1 value, the i.e. v coordinate of n point, and the L2 value of a point, the i.e. v coordinate of a point, described specified point is a point.

Precise radius R of definition wheel rim top n point circumference, precision 0.01mm, owing to this circle diameter is in running Abrasion change will not occur, therefore can be as stable high precision reference, i.e. R for it is known that utilize data host data base to store Xuan is repaiied the sized data of processing by corresponding wheel.By R, L1, L2 and revised a point and the height dimension of n point, such that it is able to Extrapolate the value of the radius r of a point.Calculate derivation as follows:

$H1=\frac{\sqrt{2}}{2}L1$

$H2=\frac{\sqrt{2}}{2}L2$

r²=(R-H2+H3)²+S2²

$S2=S-\frac{\sqrt{2}}{2}(L1-L2)$

S1²=R²-(R-H1+H3)²

$S{1}^2=R^2-{(R-\frac{\sqrt{2}}{2}L1)}^2$

$r^2={(R-\frac{\sqrt{2}}{2}L2)}^2+{(S1-\frac{\sqrt{2}}{2}(L1-L2\left)\right)}^2$

$r^2={(R-\frac{\sqrt{2}}{2}L2+H3)}^2+{(\sqrt{R^2-{\left(R-\frac{\sqrt{2}}{2}L1+H3\right)}^2}-\frac{\sqrt{2}}{2}(L1-L2\left)\right)}^2$

S105: three-dimensional system of coordinate is set up for initial point in the center of circle of specified point place rolling circle on tread, is calculated one and is The three-dimensional coordinate array of the specified point in row tread rolling circumference；

As it is shown in figure 9, set up Ys-Xs coordinate system with the position of sensor for zero, by value and the ai of R, L1, L2 Put functional relationship Ys-ai=-Xs-ai in the coordinate system and ni point functional relationship Ys-ni=-Xs-in the coordinate system Ni, calculates and takes turns the center of circle O, ai, ni point coordinate in Ys-Xs coordinate system.

$X_{s-ai}=-\frac{\sqrt{2}}{2}L2$

$Y_{s-ai}=\frac{\sqrt{2}}{2}L2$

$X_{s-ni}=-\frac{\sqrt{2}}{2}L1$

$Y_{s-ni}=\frac{\sqrt{2}}{2}L1$

$X_{s-o}=-\frac{\sqrt{2}}{2}L1-\sqrt{R^2-{(R-\frac{\sqrt{2}}{2}L1)}^2}$

Y_s-o=R.

With the center of circle of specified point ai point place rolling circle as initial point, set up coordinate system X_o-Y_o-Z_o, X-axis is parallel to track and puts down Face, Z axis is for wheel to central shaft, and Y-axis is perpendicular to orbit plane, calculates ai point relative to the coordinate X taken turns the center of circle_O-ai、Y_O-ai、 Z_O-ai。

$X_{O-ai}=-\frac{\sqrt{2}}{2}L1+\sqrt{R^2-{(R-\frac{\sqrt{2}}{2}L1)}^2};$

$Y_{O-ai}=\frac{\sqrt{2}}{2}L2-R;$

Z_O-ai=u_ni-u_ai。

S106: integrity profile curve matching corresponding for three-dimensional coordinate array is obtained the integrity profile of tread.

From wheel to advancing into laser scanning overlay area until wheel arrives sensing station to the meshing point with track Only, sensor will obtain the D coordinates value of ai in a series of rolling circumference, by the complete wheel corresponding to continuous print ai point Wide curve matching can draw the three-D profile of the local wheel tread that laser sensor scanned.

Figure 10 provides a kind of Train Wheel tread three-D profile automatic measuring system based on error correction, including: from Scatterplot collection acquisition module 201, contour curve fitting module 202, error correction module 203, radius solve module 204, three-dimensional seat Mark and solve module 205 and tread contour fitting module 206, wherein,

Discrete point set acquisition module 201, for obtaining the discrete point set of the tread wheel rim of Train Wheel different cross section；

Contour curve fitting module 202, for fitting to integrity profile curve respectively by described discrete point set；

Error correction module 203, for obtaining the distance values on wheel rim top and sensor platform, and revises rolling circle radius The height error of the specified point on the wheel rim that brings of change and tread；

Radius solves module 204, obtains the tread radius of specified point, institute on each integrity profile curve for solving respectively State specified point equal to wheel rim end face distance；

Three-dimensional coordinate solves module 205, sets up three-dimensional system of coordinate for the center of circle with specified point place rolling circle for initial point, The three-dimensional coordinate array of the specified point being calculated in a series of tread rolling circumference；

Tread contour fitting module 206, for obtaining tread by integrity profile curve matching corresponding for three-dimensional coordinate array Integrity profile.

Further, discrete point set acquisition module 201 includes coordinate acquiring unit, coordinate integrated unit, wherein,

Coordinate acquiring unit, for obtaining the coordinate of the tread wheel rim of Train Wheel different cross section；

Coordinate integrated unit, is fused into discrete point set by described coordinate.

Further, coordinate acquiring unit includes two laser displacement sensors and coordinate transformation unit,

Laser displacement sensor, is separately positioned on the inner side and outer side of described Train Wheel, and described laser displacement sensor divides Tong Bu not obtain the own coordinate system coordinate of the tread wheel rim of Train Wheel different cross section；

Coordinate transformation unit, becomes middle coordinate system coordinate by described own coordinate system Coordinate Conversion.

Further, coordinate transformation unit includes,

Measurement model subelement, is tied to the transformational relation of middle coordinate system for setting up own coordinate；

Conversion subelement, for being middle coordinate system coordinate according to described transformational relation by own coordinate system Coordinate Conversion.

Further, contour curve fitting module 202 includes:

Subsection curve drafting unit, for fitting to sectional curve by discrete point sectional；

Contour curve fitting unit, for becoming integrity profile curve by described subsection curve drafting.

The Train Wheel tread three-D profile automatic measurement method and system based on error correction that the present invention provides, it is possible to Measuring the profile of the tread of train, it will thus be seen that the degree of wear of train tread, its certainty of measurement that can reach is higher than Existing train is taken turns online to physical dimension measurement technology and the precision of general maintenance wheel footpath measurement technology, and simple in construction Easy for installation.

Finally it is noted that these are only the preferred embodiments of the present invention, it is not limited to the present invention, although Being described in detail the present invention with reference to embodiment, for a person skilled in the art, it still can be to aforementioned Technical scheme described in each embodiment is modified, or wherein portion of techniques feature carries out equivalent, but all Within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included in the protection of the present invention Within the scope of.

Claims (10)

1. a Train Wheel tread three-D profile automatic measurement method based on error correction, it is characterised in that: include following Step:

(1) discrete point set of the tread wheel rim of Train Wheel different cross section is obtained；

(2) described discrete point set is fitted to integrity profile curve respectively；

(3) obtain the distance values on wheel rim top and sensor platform, and revise wheel rim and the tread that rolling circle radius change is brought On the height error of specified point；

(4) solving respectively and obtain the tread radius of specified point on each integrity profile curve, described specified point is to wheel rim tip to face distance From equal；

(5) three-dimensional system of coordinate is set up for initial point in the center of circle with specified point place rolling circle, is calculated a series of tread rolling circle The three-dimensional coordinate array of the specified point on week；

(6) integrity profile curve matching corresponding for three-dimensional coordinate array is obtained the integrity profile of tread.

Train Wheel tread three-D profile automatic measurement method based on error correction the most according to claim 1, it is special Levying and be, the discrete point set of the tread wheel rim of described acquisition Train Wheel different cross section includes:

(11) coordinate of the tread wheel rim of Train Wheel different cross section is obtained；

(12) described coordinate is fused into discrete point set.

Train Wheel tread three-D profile automatic measurement method based on error correction the most according to claim 2, it is special Levy and be,

The coordinate of the tread wheel rim of described acquisition Train Wheel different cross section includes:

It is respectively provided with laser displacement sensor near the tread of Train Wheel and the position of wheel rim in orbit, enters from Train Wheel and swash Optical displacement sensor effective range is stopped to leaving laser displacement sensor effective range, two laser displacement sensors Synchronize to obtain the own coordinate system coordinate of the tread wheel rim of Train Wheel different cross section respectively；

Described own coordinate system Coordinate Conversion is become middle coordinate system coordinate.

Train Wheel tread three-D profile automatic measurement method based on error correction the most according to claim 3, it is special Levy and be, described become middle coordinate system coordinate to include described own coordinate system Coordinate Conversion:

Set up own coordinate and be tied to the transformational relation of middle coordinate system；

It is middle coordinate system coordinate according to described transformational relation by own coordinate system Coordinate Conversion.

Train Wheel tread three-D profile automatic measurement method based on error correction the most according to claim 1, it is special Levy and be, described described discrete point set is fitted to integrity profile curve respectively include:

Discrete point sectional is fitted to sectional curve；

Described subsection curve drafting is become integrity profile curve.

6. a Train Wheel tread three-D profile automatic measuring system based on error correction, it is characterised in that including: discrete Point set acquisition module, contour curve fitting module, error correction module, radius solve module, three-dimensional coordinate solves module and Tread contour fitting module, wherein,

Discrete point set acquisition module, for obtaining the discrete point set of the tread wheel rim of Train Wheel different cross section；

Contour curve fitting module, for fitting to integrity profile curve respectively by described discrete point set；

Error correction module, for obtaining the distance values on wheel rim top and sensor platform, and revises rolling circle radius change band The height error of the specified point on the wheel rim come and tread；

Radius solves module, obtains the tread radius of specified point on each integrity profile curve for solving respectively, described specific Point is equal to wheel rim end face distance；

Three-dimensional coordinate solves module, sets up three-dimensional system of coordinate for the center of circle with specified point place rolling circle for initial point, calculates The three-dimensional coordinate array of the specified point in a series of tread rolling circumferences；

Tread contour fitting module, for obtaining the complete wheel of tread by integrity profile curve matching corresponding for three-dimensional coordinate array Wide.

Train Wheel tread three-D profile automatic measuring system based on error correction the most according to claim 6, it is special Levying and be, described discrete point set acquisition module includes coordinate acquiring unit, coordinate integrated unit, wherein,

Coordinate acquiring unit, for obtaining the coordinate of the tread wheel rim of Train Wheel different cross section；

Coordinate integrated unit, is fused into discrete point set by described coordinate.

Train Wheel tread three-D profile automatic measuring system based on error correction the most according to claim 7, it is special Levy and be,

Described coordinate acquiring unit includes two laser displacement sensors and coordinate transformation unit,

Laser displacement sensor, is separately positioned on the inner side and outer side of described Train Wheel, and described laser displacement sensor is same respectively Step obtains the own coordinate system coordinate of the tread wheel rim of Train Wheel different cross section；

Coordinate transformation unit, becomes middle coordinate system coordinate by described own coordinate system Coordinate Conversion.

Train Wheel tread three-D profile automatic measuring system based on error correction the most according to claim 8, it is special Levying and be, described coordinate transformation unit includes,

Measurement model subelement, is tied to the transformational relation of middle coordinate system for setting up own coordinate；

Conversion subelement, for being middle coordinate system coordinate according to described transformational relation by own coordinate system Coordinate Conversion.

Train Wheel tread three-D profile automatic measuring system based on error correction the most according to claim 6, it is special Levying and be, described contour curve fitting module includes:

Subsection curve drafting unit, for fitting to sectional curve by discrete point sectional；

Contour curve fitting unit, for becoming integrity profile curve by described subsection curve drafting.