CN106052589A - Automatic measuring method and system for standard tread rolling circle profile of train wheel on tread - Google Patents

Abstract

The invention provides an automatic measuring method and system for standard tread rolling circle profile of train wheel on tread, which comprises the following steps: (1) obtaining the discrete point sets of different cross section tread rims of a train wheel; (2) fitting the discrete point sets respectively into complete profile curves; (3) solving the tread radiuses of the specific points on the complete profile curves respectively with the distances from the specific points to the wheel brim end face being equal to each other; (4) establishing two-dimension coordinate systems using the center of the running circles of the specific points as original points and calculating the coordinates of specific points on a series of tread rolling circumferences; (5) fitting the coordinates of the specific points on the tread rolling circumferences for tread rolling circle curves. According to the automatic measuring method and system for standard tread rolling circle profile of train wheel on tread, it is possible to measure the rolling circle profile of train wheel on tread so that the wear degree of the train tread surface can be seen and the measurement accuracy is high.

Description

Railway wheelset tread standard rolling circle profile automatic measurement method and system

Technical field

The present invention relates to a kind of Railway wheelset tread standard rolling circle profile automatic measurement method and system, particularly relate 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, it is wide that the technical problem to be solved in the present invention is to provide a kind of Railway wheelset tread standard rolling circle Shape automatic measurement method and system, its certainty of measurement is high.

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

A kind of Railway wheelset tread standard rolling circle profile automatic measurement method, 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) 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；

(4) set up two-dimensional coordinate system with the rolling circle center of circle, specified point place for initial point, be calculated the rolling of a series of tread The coordinate of the specified point on dynamic circumference；

(5) coordinate fitting of the specified point in tread rolling circumference is obtained the rolling circle curve 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 Railway wheelset tread standard rolling circle profile automatic measuring system, including: discrete point set acquisition module, wheel Wide curve fitting module, radius solves module, coordinate solves module and rolling circle curve 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；

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

Coordinate solves module, for setting up two-dimensional coordinate system with the rolling circle center of circle, specified point place for initial point, calculates The coordinate of the specified point in a series of tread rolling circumferences；

Rolling circle curve fitting module, for obtaining the rolling of tread by the coordinate fitting of the specified point in tread rolling circumference Dynamic circular curve.

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 Railway wheelset tread standard rolling circle profile automatic measurement method and system that the present invention provides, it is possible to measure row The rolling circle profile of the tread of car, 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.

Accompanying drawing explanation

Fig. 1 is the flow chart of Railway wheelset tread standard rolling circle profile automatic measurement method of the present invention；

Fig. 2 be in Railway wheelset tread standard rolling circle profile automatic measurement method of the present invention laser displacement sensor with The relative position top view of Train Wheel；

Fig. 3 is that in Railway wheelset tread standard rolling circle profile automatic measurement method of the present invention, laser displacement sensor is surveyed Weight range schematic diagram；

Fig. 4 is laser displacement sensor in Railway wheelset tread standard rolling circle profile automatic measurement method of the present invention Perspective view；

Fig. 5 a and 5b is respectively the laser position of Railway wheelset tread standard rolling circle profile automatic measurement method of the present invention Displacement sensor A and B is Coordinate Conversion schematic diagram；

Fig. 6 is the tread after merging in Railway wheelset tread standard rolling circle profile automatic measurement method of the present invention and wheel The discrete point set schematic diagram of the profile of edge；

Fig. 7 is by discrete point set matching shape in Railway wheelset tread standard rolling circle profile automatic measurement method of the present invention The integrity profile curve become；

Fig. 8 be in Railway wheelset tread standard rolling circle profile automatic measurement method of the present invention wheel dynamically through laser The laser rays measurement model figure that displacement transducer obtains；

Fig. 9 is that in Railway wheelset tread standard rolling circle profile automatic measurement method of the present invention, the Coordinate Conversion of ai point is shown It is intended to；

Figure 10 is sweeping under wheel moves in Railway wheelset tread standard rolling circle profile automatic measurement method of the present invention Retouch measurement figure；

Figure 11 is the composition structural representation of Railway wheelset tread standard rolling circle profile automatic measuring system of the present invention.

Detailed description of the invention

As Figure 1-Figure 5, Railway wheelset tread standard rolling circle profile automatic measurement method of the present invention includes 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=u_n ⁽³⁾u_n=u_n ⁽⁴⁾+Δ_u

v_n=v_n ⁽⁴⁾v_n=v_n ⁽⁴⁾+Δv

(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: 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；

Fig. 8 is radius measurement geometry location illustraton of model, and the integrity profile curve obtained according to matching obtains some a, n at coordinate It is the accurate coordinates value in uov, such that it is able to draw corresponding n point L1 value, the i.e. v coordinate of n point, and the L2 value of a point, i.e. a point V coordinate, 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.Take turns during by measured zone, make wheel that wheel rim to be climbed up wheel rim and measure supporting track, Order wheel height same to wheel rim circumference bottom position and sensor measurement zero, forms such as the geometry location model of Fig. 8, passes through R, L1, L2, 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)²+S2²

$S2=S1-\frac{\sqrt{2}}{2}(L1-L2)$

S1²=R²-(R-H1)²

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

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

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

S104: setting up two-dimensional coordinate system with the rolling circle center of circle, specified point place for initial point, be calculated a series of tread The coordinate of the specified point in 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.

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

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

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

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

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

Y_s-o=R.

Coordinate system X is set up for initial point in rolling circle place plane with the center of circle of a point place rolling circle_o-Y_o, calculate ai point phase For the wheel coordinate X to the center of circle_O-ai、Y_O-ai, form the ai point two-dimensional coordinate system relative to the wheel center of circle.

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

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

As shown in Figure 10, laser scanning overlay area is advanced into when wheel until wheel arrives biography to the meshing point with track Only, sensor will obtain ai and XO-ai, YO-ai coordinate figure of center of circle relative coordinate in a series of rolling circumference in sensor position, The local wheel tread rolling circle curve that laser sensor is scanned can be drawn by continuous print ai point is carried out curve fitting Profile.The scanning survey that can realize integrity profile is arranged continuously again by many group sensors.

S105: the coordinate fitting of the specified point in tread rolling circumference is obtained the rolling circle curve of tread.

Figure 11 provides a kind of Railway wheelset tread standard rolling circle profile automatic measuring system, including: discrete point set Acquisition module 201, contour curve fitting module 202, radius solve module 203, coordinate solves module 204 and rolling circle curve Fitting module 205, 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；

Radius solves module 203, solves respectively and obtains the tread radius of specified point, described spy on each integrity profile curve Fixed point is equal to wheel rim end face distance；

Coordinate solves module 204, for setting up two-dimensional coordinate system with the rolling circle center of circle, specified point place for initial point, calculates Obtain the coordinate of specified point in a series of tread rolling circumference；

Rolling circle curve fitting module 205, for obtaining tread by the coordinate fitting of the specified point in tread rolling circumference Rolling circle curve.

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 Railway wheelset tread standard rolling circle profile automatic measurement method and system that the present invention provides, it is possible to measure row The rolling circle profile of the tread of car, 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 Railway wheelset tread standard rolling circle profile automatic measurement method, it is characterised in that: comprise 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) 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；

(4) set up two-dimensional coordinate system with the rolling circle center of circle, specified point place for initial point, be calculated a series of tread rolling circle The coordinate of the specified point on week；

(5) coordinate fitting of the specified point in tread rolling circumference is obtained the rolling circle curve of tread.

Railway wheelset tread standard rolling circle profile automatic measurement method the most according to claim 1, it is characterised in that 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.

Railway wheelset tread standard rolling circle profile automatic measurement method the most according to claim 2, it is characterised in that

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.

Railway wheelset tread standard rolling circle profile automatic measurement method the most according to claim 3, it is characterised in that 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.

Railway wheelset tread standard rolling circle profile automatic measurement method the most according to claim 1, it is characterised in that 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.

6. a Railway wheelset tread standard rolling circle profile automatic measuring system, it is characterised in that including: discrete point set obtains Delivery block, contour curve fitting module, radius solve module, coordinate solves module and rolling circle curve 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；

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；

Coordinate solves module, for setting up two-dimensional coordinate system with the rolling circle center of circle, specified point place for initial point, is calculated one The coordinate of the specified point in series tread rolling circumference；

Rolling circle curve fitting module, for obtaining the rolling circle of tread by the coordinate fitting of the specified point in tread rolling circumference Curve.

Railway wheelset tread standard rolling circle profile automatic measuring system the most according to claim 6, it is characterised in that 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.

Railway wheelset tread standard rolling circle profile automatic measuring system the most according to claim 7, it is characterised in that

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.

Railway wheelset tread standard rolling circle profile automatic measuring system the most according to claim 8, it is characterised in that 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.

Railway wheelset tread standard rolling circle profile automatic measuring system the most according to claim 6, its feature exists In, 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.