CN115143924A - Method for measuring concentricity of rotor disc center - Google Patents
Method for measuring concentricity of rotor disc center Download PDFInfo
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- CN115143924A CN115143924A CN202110331590.6A CN202110331590A CN115143924A CN 115143924 A CN115143924 A CN 115143924A CN 202110331590 A CN202110331590 A CN 202110331590A CN 115143924 A CN115143924 A CN 115143924A
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
- G01B21/24—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes for testing alignment of axes
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Abstract
The invention relates to a method for measuring concentricity of a rotor disc center, which comprises the following steps: measuring radial run-out data R1 of a front journal reference C of a high-pressure compressor rotor; measuring the radial runout data R2 of the plate center of a grate plate arranged on the rear shaft neck of the high-pressure compressor rotor and the end face runout data T2 of the grate plate; assembling a high-pressure compressor rotor to a stator casing, and assembling a high-pressure turbine rotor to the high-pressure compressor rotor, wherein a front shaft neck of the high-pressure turbine rotor is connected with a rear shaft neck of the high-pressure compressor rotor; measuring radial run-out data R3 of a rear journal reference D of the high-pressure turbine rotor; measuring radial runout data R2d of the center of the grate disc and end face runout data T2d of the grate disc; the concentricity of the disk core of the grate disk relative to the front journal reference of the high-pressure compressor rotor and the rear journal reference of the high-pressure turbine rotor is obtained through an algorithm, and the measurement precision of the concentricity of the grate disk is improved.
Description
Technical Field
The invention relates to the technical field of aerospace, in particular to a method for measuring concentricity of a rotor disc center.
Background
In the assembly process of the aircraft engine, after the high-pressure turbine rotor is assembled to the high-pressure compressor rotor, the grate disc core is subjected to run-out measurement by taking the pivot of the front journal and the pivot of the rear journal as references, so as to obtain the concentricity of the grate disc core relative to the front and rear references, as shown in fig. 1, the front journal reference is defined as C, and the rear journal reference is defined as D. However, in the measurement process, the support state of the high-pressure rotor is a vertical state, and is influenced by the angular pendulum supported by the two positions of the reference C and the reference D, the rotating shaft of the high-pressure rotor cannot rotate along the fixed rotating shaft, and the rotating axis is not the rotating shaft in the working state of the engine, so that the traditional method (fixing the reference C by the bearing and fixing the reference D by the roller) cannot acquire the accurate concentricity of the labyrinth disc core relative to the front reference and the rear reference, and the whole measurement structure causes a great error of the measurement result.
Disclosure of Invention
Some embodiments of the present invention provide a method for measuring concentricity of a rotor disk center, which is used to alleviate the problem of a large error in measuring concentricity of the rotor disk center.
Some embodiments of the present invention provide a rotor disc concentricity measuring method, which includes the steps of:
measuring radial run-out data R1 of a front journal reference C of a high-pressure compressor rotor;
measuring the radial runout data R2 of the plate center of a grate plate arranged on the rear shaft neck of the high-pressure compressor rotor and the end face runout data T2 of the grate plate;
assembling a high-pressure compressor rotor to a stator casing, and assembling a high-pressure turbine rotor to the high-pressure compressor rotor, wherein a front shaft neck of the high-pressure turbine rotor is connected with a rear shaft neck of the high-pressure compressor rotor;
measuring radial run-out data R3 of a rear journal reference D of the high-pressure turbine rotor;
measuring radial runout data R2d of the center of the grate disc and end face runout data T2d of the grate disc;
establishing a coordinate system O-XYZ by using the disk center radial jumping data R2 of the grate disk and the end face jumping data T2 of the grate disk; converting the radial run-out data R1 of the reference C according to a pose matrix generated in the process of establishing a coordinate system, converting the pose matrix into the established coordinate system O-XYZ, and obtaining a run-out value of the radial run-out data R1 in the coordinate system O-XYZ X R1；
Establishing a coordinate system O-UVW by using the disk center radial runout data R2d of the grate disk and the end face runout data T2d of the grate disk; converting the radial runout data R3 of the reference D according to a pose matrix generated in the process of establishing a coordinate system into the established coordinate system O-UVW to obtain a radial runoutJitter value of jitter data R3 under coordinate system O-UVW U R3；
The coordinate system O-XYZ is coincided with the coordinate system O-UVW through verification;
will be provided with X R1 and U r3 is connected into a straight line, the straight line and the UV surface of the coordinate system O-UVW are provided with a first intersection point, and the distance between the first intersection point and the origin of the coordinate system O-UVW is the concentricity amplitude; or the straight line and the XY surface of the coordinate system O-XYZ have a second intersection point, and the distance between the second intersection point and the point of the coordinate system O-XYZ is the concentricity argument;
the concentricity deviation angle is an included angle between the first intersection point and the U axis in the coordinate system O-UVW plus 180 degrees; or the concentricity deviation angle is the included angle between the second intersection point and the X axis in the coordinate system O-XYZ plus 180 degrees.
In some embodiments, the method of establishing the coordinate system O-XYZ comprises: and fitting the radial runout data R2 of the disk center of the labyrinth disk by adopting a least square method, wherein the fitted circle center is the origin of a coordinate system O-XYZ.
In some embodiments, the method adopts a least square method to fit the radial runout data R2 of the center of the labyrinth plate, the method is realized by adopting the following formula:
wherein f is a least squares function;
x o (1) is the origin x The x coordinate of O;
x o (2) as the origin x The Y coordinate of O;
r is the distance between the radial runout measuring position of the disk center of the grate disk and the central axis of the rotor;
theta is the angle corresponding to radial runout of the plate center of the grate plate.
In some embodiments, the method of establishing the coordinate system O-XYZ further comprises: combining the end face run-out data T2 of the grate disc with a least square method fitting plane, taking a plane normal vector as a Z axis, and taking the direction of a radial run-out starting measuring point of the grate disc as an X axis.
In some embodiments, the fitting of the plane by combining the end face run-out data T2 of the labyrinth plate with the least square method is implemented by using the following formula:
wherein g is a least squares function;
x z (1) is x The x coordinate of the Z vector;
x z (2) is x The y-coordinate of the Z-vector;
x z (3) is x The Z coordinate of the Z vector;
r is the distance between the end face jumping measurement position of the grate disc and the central axis of the rotor;
beta is the angle corresponding to the end face jumping of the grate disc.
In some embodiments, the method of establishing the coordinate system O-UVW comprises: and fitting the radial runout data R2d of the disk center of the labyrinth disk by adopting a least square method, wherein the fitted circle center is the origin of the coordinate system O-UVW.
In some embodiments, the method of establishing the coordinate system O-UVW further comprises: combining the end face run-out data T2d of the grate disc with a least square method fitting plane, taking a plane normal vector as a W axis, and taking the direction of a radial run-out starting measuring point of the grate disc as a U axis.
In some embodiments, the distance P between the first intersection point and the origin of the coordinate system O-UVW is the concentricity argument, wherein,
in some embodiments, the off-concentricity angle α is the angle between the first intersection and the U-axis in the coordinate system O-UVW plus 180 °, where α = arctan (v/U) +180 °.
Based on the technical scheme, the invention at least has the following beneficial effects:
in some embodiments, before the high-pressure compressor rotor and the high-pressure turbine rotor are assembled, measured radial run-out data of a front journal reference of the high-pressure compressor rotor, measured core radial run-out data of a grate disc and measured end face run-out data of the grate disc are combined after the high-pressure compressor rotor and the high-pressure turbine are rotationally assembled, the measured radial run-out data of a rear journal reference of the high-pressure turbine rotor, measured core radial run-out data of the grate disc and measured end face run-out data of the grate disc are obtained through an algorithm, concentricity of the core of the grate disc relative to the front journal reference of the high-pressure compressor rotor and the rear journal reference of the high-pressure turbine rotor is obtained, and measuring accuracy of the concentricity of the grate disc is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic view of a rotor jump position configuration provided in accordance with some embodiments of the present invention;
FIG. 2 is a schematic view of a high pressure compressor rotor unit state runout measurement location provided in accordance with some embodiments of the invention;
FIG. 3 is a simplified structural schematic of a high pressure turbine rotor provided in accordance with some embodiments of the present invention;
FIG. 4 is a simplified block diagram of a stator case according to some embodiments of the present invention;
FIG. 5 is a schematic view of a rotor assembly run-out measurement position provided in accordance with some embodiments of the present invention;
fig. 6 is a schematic flow chart of a method for measuring concentricity of a rotor disk according to some embodiments of the present invention.
The reference numbers in the drawings illustrate the following:
1-a high pressure compressor rotor;
2-a high pressure turbine rotor;
3-a grate disc;
4-stator case.
Detailed Description
The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings, which are based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the scope of the invention.
As shown in fig. 1, the rotor system comprises a high-pressure compressor rotor 1 and a high-pressure turbine rotor 2, and a labyrinth disc 3 is mounted on the high-pressure compressor rotor 1. The specific assembly method of the rotor system comprises the following steps: the high-pressure compressor rotor 1 and the high-pressure compressor stator are assembled into a high-pressure compressor unit body (as shown in fig. 2), then the high-pressure compressor unit body is assembled into a combustor stator casing 3 (the combustor stator casing is shown in fig. 4), and finally, the high-pressure turbine rotor 2 (as shown in fig. 3) is assembled into the high-pressure compressor rotor 1 (as shown in fig. 5).
As shown in fig. 2, the labyrinth plate 3 is mounted on the high-pressure compressor rotor 1, and fig. 2 shows the measurement position of the radial runout data R1 of the front journal reference C of the high-pressure compressor rotor 1, and the measurement positions of the core radial runout data R2 of the labyrinth plate 3 and the end face runout data T2 of the labyrinth plate 3.
As shown in fig. 5, the measured positions of the center radial run-out data R2D of the labyrinth plate 3 and the end face run-out data T2D of the labyrinth plate 3, and the measured position of the radial run-out data R3 of the rear journal reference D of the high-pressure turbine rotor 2 are shown. After the high-pressure turbine rotor 2 is assembled to the high-pressure compressor rotor 1, the front end face of the high-pressure turbine rotor 2 is tightly attached to the rear end face of the grate disc 3.
The rotor disc center concentricity measuring method provided by some embodiments of the disclosure is used for measuring the concentricity of a grate disc center relative to a front fulcrum and a rear fulcrum under the assembly of an entire core machine of an aircraft engine.
As shown in fig. 6, in some embodiments, the rotor disk concentricity measurement method includes the steps of:
as shown in fig. 2, measuring radial run-out data R1 of a front journal reference C of a high-pressure compressor rotor 1;
as shown in fig. 2, measuring the radial runout data R2 of the disk center of a labyrinth disk 3 and the end face runout data T2 of the labyrinth disk 3 which are arranged on the rear shaft neck of a high-pressure compressor rotor 1;
assembling the high-pressure compressor rotor 1 to the stator casing 4, and assembling the high-pressure turbine rotor 2 to the high-pressure compressor rotor 1, wherein a front journal of the high-pressure turbine rotor 2 is connected with a rear journal of the high-pressure compressor rotor 1, as shown in fig. 5;
as shown in fig. 5, the radial run-out data R3 of the high-pressure turbine rotor 2 rear journal reference D is measured;
as shown in fig. 5, measuring the radial runout data R2d of the center of the grate plate 3 and the end face runout data T2d of the grate plate 3;
establishing a coordinate system O-XYZ by using the radial runout data R2 of the disk center of the grate disk 3 and the end face runout data T2 of the grate disk 3; converting the radial run-out data R1 of the reference C according to a pose matrix generated in the process of establishing a coordinate system, converting the pose matrix into the established coordinate system O-XYZ, and obtaining a run-out value of the radial run-out data R1 in the coordinate system O-XYZ X R1；
Establishing a coordinate system O-UVW by using the disk center radial runout data R2d of the grate disk 3 and the end face runout data T2d of the grate disk 3; converting the radial runout data R3 of the reference D according to a pose matrix generated in the process of establishing a coordinate system, converting the pose matrix into the established coordinate system O-UVW, and obtaining a runout value of the radial runout data R3 under the coordinate system O-UVW U R3；
Through verification, the coordinate system O-XYZ is superposed with the coordinate system O-UVW;
will be provided with X R1 and U r3 is connected into a straight line, the straight line and the UV surface of the coordinate system O-UVW have a first intersection point, and the first intersection point and the UV surface of the coordinate system O-UVWThe distance of the origin of the coordinate system O-UVW is the concentricity amplitude; or the straight line and the XY surface of the coordinate system O-XYZ have a second intersection point, and the distance between the second intersection point and the point of the coordinate system O-XYZ is the concentricity argument;
the concentricity deviation angle is an included angle formed by the first intersection point and the U axis in the coordinate system O-UVW plus 180 degrees; or the concentricity deviation angle is the included angle between the second intersection point and the X axis in the coordinate system O-XYZ plus 180 degrees.
Before the high-pressure compressor rotor 1 and the high-pressure turbine rotor 2 are assembled, measuring radial runout data R1 of a front journal reference C of the high-pressure compressor rotor 1, disc center radial runout data R2 of a grate disc 3 and end face runout data T2 of the grate disc 3; after the high-pressure compressor rotor 1 and the high-pressure turbine rotor 2 are rotationally matched, measuring radial run-out data R3 of a rear journal datum D of the high-pressure turbine rotor 2, disk center radial run-out data R2D and end face run-out data T2D of a grate disk 3, and quickly obtaining the concentricity and run-out of a disk center of the grate disk relative to a front journal datum C of the high-pressure compressor rotor 1 and the rear journal datum D of the high-pressure turbine rotor 2 by establishing coordinates and corresponding algorithms, so that the disk center run-out and concentricity measurement accuracy of the grate disk is improved, the angular pendulum error of the disk center of the grate disk in the measurement process is reduced, the rotation axis of the grate disk in the run-out measurement process is collinear with the central axis of the rotor, the run-out of the rotor disk relative to the rotating shaft can be measured in the complete machine state of the disk center of the rotor, and the production and processing cost is greatly reduced.
In some embodiments, the method of establishing the coordinate system O-XYZ comprises: and fitting the disk center radial runout data R2 of the grate disk 3 by adopting a least square method, wherein the fitted circle center is the origin of a coordinate system O-XYZ.
In some embodiments, the fitting of the center radial run-out data R2 of the labyrinth plate 3 by the least square method is implemented by the following formula:
wherein f is a least squares function;
x o (1) is the origin x The x coordinate of O;
x o (2) as the origin x The Y coordinate of O;
r is the distance between the radial runout measuring position of the disk center of the grate disk 3 and the central axis of the rotor;
theta is the angle corresponding to the radial runout of the disk center of the grate disk 3.
In some embodiments, the method of establishing the coordinate system O-XYZ further comprises: and fitting a plane by combining the end face run-out data T2 of the labyrinth plate 3 with a least square method, taking a plane normal vector as a Z axis (positive along the course), and taking the direction of the initial measuring point of the radial run-out of the labyrinth plate 3 as an X axis.
In some embodiments, the plane is fitted by combining the end face run-out data T2 of the toothed disc 3 with a least square method, and the following formula is adopted:
wherein g is a least squares function;
x z (1) is x The x coordinate of the Z vector;
x z (2) is x The y-coordinate of the Z-vector;
x z (3) is x The Z coordinate of the Z vector;
r is the distance between the end face jumping measurement position of the grate disc 3 and the central line of the rotor;
beta is the angle corresponding to the end face runout of the grate disc 3.
In some embodiments, a method of establishing a coordinate system O-UVW includes: and fitting the radial runout data R2d of the disk center of the grate disk 3 by adopting a least square method, wherein the fitted circle center is the origin of a coordinate system O-UVW.
In some embodiments, the method of establishing the coordinate system O-UVW further comprises: and fitting a plane by combining the end face run-out data T2d of the labyrinth plate 3 with a least square method, taking a plane normal vector as a W axis, and taking the direction of a radial run-out starting measurement point of the labyrinth plate 3 as a U axis.
In some embodiments, the distance P between the first intersection point and the origin of the coordinate system O-UVW is the concentricity argument, wherein,
in some embodiments, the off-concentricity angle α is the angle between the first intersection and the U-axis in the coordinate system O-UVW plus 180 °, where α = arctan (v/U) +180 °.
An embodiment of a method for measuring the concentricity of the rotor disk is described below. In this embodiment, the method for measuring the concentricity of the rotor disk center includes the following steps:
firstly, under the state of a rotor unit body of the high-pressure compressor, measuring radial runout data R1 of a front journal reference C of the rotor 1 of the high-pressure compressor, and measuring the radial runout data R2 of a disk center of a grate disk 3 and end face runout data T2 of the grate disk 3 while measuring the runout of the front journal reference C, as shown in figure 2.
In the whole machine assembling process, after the high-pressure turbine rotor 2 is assembled to the high-pressure compressor rotor 1, measuring radial run-out data R3 of a rear journal reference D of the high-pressure turbine rotor 2, and measuring the center radial run-out data R2D of the grate disc 3 and the end face run-out data T2D of the grate disc 3 by using a measuring tool while measuring the rear journal reference D run-out, as shown in FIG. 5.
Next, a calculation is performed using the measured jitter data:
the method comprises the following steps of establishing a coordinate system O-XYZ by using the runout data of the rotor unit body of the high-pressure compressor and the radial runout data R2 of the disk center of the labyrinth disk 3 and the end face runout data T2 of the labyrinth disk 3 according to the following establishing principle: and fitting the radial runout data R2 of the disk center of the labyrinth disk 3 by adopting a least square method, wherein the fitted circle center is the original point of a coordinate system O-XYZ (the formula (1), combining the end face runout data T2 of the labyrinth disk 3 with a least square method fitting plane, taking a plane normal vector (positive along the course) as a Z axis, taking the direction of the initial measuring point of the radial runout of the labyrinth disk 3 as an X axis, and marking the X axis.
Note: the radial runout starting measurement point of the grate disc 3 is consistent with the rotation angle of the radial runout starting measurement point of the front shaft neck reference C of the high-pressure compressor rotor 1.
X O＝fitcircle(R2) (1)
X Z＝fitplane(T2) (2)
Converting the radial run-out data R1 of the reference C according to a pose matrix generated in the process of establishing a coordinate system, converting the pose matrix into the established coordinate system O-XYZ, and obtaining a run-out value of the radial run-out data R1 in the coordinate system O-XYZ X R1。
A coordinate system O-UVW is established by utilizing the jumping data in the whole machine assembling process and using the disk center radial jumping data R2d of the grate disk 3 and the end face jumping data T2d of the grate disk 3, and the establishing principle is as follows: and fitting the radial runout data R2d of the disk center of the labyrinth disk 3 by adopting a least square method, wherein the fitted circle center is the original point of a coordinate system O-UVW (universal test point-UVW), see formula (3), combining the end face runout data T2d of the labyrinth disk 3 with a least square method fitting plane, taking a plane normal vector (positive along the course) as a W axis, see formula (4), and taking the direction of an X-axis mark identified by the unit body state of the high-pressure rotor as a U axis.
Note: the radial runout starting measuring point of the grate disc 3 is consistent with the rotation angle of the radial runout starting measuring point of the rear journal reference D of the high-pressure turbine rotor 2.
U O＝fitcircle(R2d) (3)
U Z＝fitplane(T2d) (4)
Converting the radial runout data R3 of the reference D according to a pose matrix generated in the process of establishing a coordinate system, converting the pose matrix into the established coordinate system O-UVW, and obtaining a runout value of the radial runout data R3 under the coordinate system O-UVW U R3。
And the coordinate system O-UVW is verified to be coincident with the coordinate system O-XYZ.
Will be provided with X R1 and U r3 is connected into a straight line, the straight line and the UV surface of the coordinate system O-UVW have a first intersection point, and the distance between the first intersection point and the origin of the coordinate system O-UVW is the concentricity amplitude value(ii) a Or the straight line and the XY surface of the coordinate system O-XYZ have a second intersection point, and the distance between the second intersection point and the point of the coordinate system O-XYZ is the concentricity argument;
the concentricity deviation angle is an included angle formed by the first intersection point and the U axis in the coordinate system O-UVW plus 180 degrees; or the concentricity deviation angle is the included angle between the second intersection point and the X axis in the coordinate system O-XYZ plus 180 degrees.
For example: the first intersection coordinates are (u, v, 0), and the concentricity argument P and the concentricity offset angle α are formula (5) and formula (6), respectively.
α＝arctan(v/u)+180° (6)
The embodiment provided by the disclosure utilizes the reference jumping data detection to improve the precision of the relative reference jumping of the center of the grate plate; compensating by using the fluctuation data caused by the axis swing to repair the angle swing error; and fitting and simulating the rotation of the rotor by using the rotation data for constructing axis fitting.
Based on the embodiments of the present invention described above, in the case where there is no explicit negation, the features of one embodiment may be beneficially combined with one or more other embodiments.
In the description of the present invention, it should be understood that the terms "first", "second", "third", etc. are used to define the components, and are used only for the convenience of distinguishing the components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present invention.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the invention, it is intended to cover all modifications within the scope of the invention as claimed.
Claims (9)
1. A method for measuring the concentricity of a rotor disk center is characterized by comprising the following steps:
measuring radial run-out data R1 of a front journal reference C of a high-pressure compressor rotor (1);
measuring disk center radial run-out data R2 of a grate disk (3) arranged on a rear shaft neck of a high-pressure compressor rotor (1) and end face run-out data T2 of the grate disk (3);
assembling a high-pressure compressor rotor (1) to a stator casing (4), and assembling a high-pressure turbine rotor (2) to the high-pressure compressor rotor (1), wherein a front shaft neck of the high-pressure turbine rotor (2) is connected with a rear shaft neck of the high-pressure compressor rotor (1);
measuring radial run-out data R3 of a rear journal reference D of the high-pressure turbine rotor (2);
measuring radial runout data R2d of the disk center of the grate disk (3) and end face runout data T2d of the grate disk (3);
establishing a coordinate system O-XYZ by using the radial runout data R2 of the disk center of the grate disk (3) and the end face runout data T2 of the grate disk (3); converting the radial runout data R1 of the reference C according to a position and posture matrix generated in the process of establishing a coordinate system, converting the radial runout data R1 into the established coordinate system O-XYZ to obtain a runout value of the radial runout data R1 under the coordinate system O-XYZ X R1；
Establishing a coordinate system O-UVW by using the disk center radial runout data R2d of the grate disk (3) and the end face runout data T2d of the grate disk (3); converting the radial runout data R3 of the reference D according to a pose matrix generated in the process of establishing a coordinate system, converting the pose matrix into the established coordinate system O-UVW, and obtaining a runout value of the radial runout data R3 under the coordinate system O-UVW U R3；
The coordinate system O-XYZ is coincided with the coordinate system O-UVW through verification;
will be provided with X R1 and U r3 is connected into a straight line, the straight line and the UV surface of the coordinate system O-UVW are provided with a first intersection point, and the distance between the first intersection point and the origin of the coordinate system O-UVW is the concentricity amplitude; or the straight line and the XY plane of the coordinate system O-XYZ have a second intersection point, and the distance between the second intersection point and the point of the coordinate system O-XYZ is the concentric pointThe amplitude of the measurement;
the concentricity deviation angle is an included angle formed by the first intersection point and the U axis in the coordinate system O-UVW plus 180 degrees; or the concentricity deviation angle is the included angle between the second intersection point and the X axis in the coordinate system O-XYZ plus 180 degrees.
2. The method of measuring concentricity of a rotor disk as defined in claim 1, wherein the method of establishing the coordinate system O-XYZ comprises: and fitting the radial runout data R2 of the disk center of the grate disk (3) by adopting a least square method, wherein the fitted circle center is the origin of a coordinate system O-XYZ.
3. The method for measuring the concentricity of the rotor disk center as claimed in claim 2, wherein the fitting of the radial runout data R2 of the disk center of the grate disk (3) is realized by adopting the following formula:
wherein f is a least squares function;
x o (1) is the origin x The x coordinate of O;
x o (2) as the origin x The Y coordinate of O;
r is the distance between the measuring position of radial runout of the disk center of the grate disk (3) and the central axis of the rotor;
theta is the angle corresponding to the radial runout of the disk center of the grate disk (3).
4. The rotor hub concentricity measurement method of claim 2, wherein the method of establishing the coordinate system O-XYZ further comprises: combining the end face run-out data T2 of the grate disc (3) with a least square method to fit a plane, taking a plane normal vector as a Z axis, and taking the direction of a radial run-out starting measurement point of the grate disc (3) as an X axis.
5. The method for measuring the concentricity of the rotor disc center according to claim 4, wherein the end face run-out data T2 of the grate disc (3) is combined with a least square method to fit a plane, and the following formula is adopted:
wherein g is a least squares function;
x z (1) is x The x coordinate of the Z vector;
x z (2) is x The y-coordinate of the Z-vector;
x z (3) is x The Z coordinate of the Z vector;
r is the distance between the end face run-out measuring position of the grate disc (3) and the central axis of the rotor;
beta is the angle corresponding to the end face runout of the grate disc (3).
6. The method of measuring rotor disk concentricity according to claim 1, wherein the method of establishing the coordinate system O-UVW comprises: and fitting the radial runout data R2d of the disk center of the labyrinth disk (3) by adopting a least square method, wherein the center of the fitted circle is the origin of the coordinate system O-UVW.
7. The method of measuring rotor disk concentricity of claim 6, wherein the method of establishing the coordinate system O-UVW further comprises: combining the end face run-out data T2d of the grate disc (3) with a least square method fitting plane, taking a plane normal vector as a W axis, and taking the direction of an initial measuring point of radial run-out of the grate disc (3) as a U axis.
8. The method of claim 1, wherein a distance P between the first intersection point and an origin of a coordinate system O-UVW is a concentricity amplitude, wherein,
9. a method of measuring the concentricity of a rotor disc as claimed in claim 1, wherein the off-angle of concentricity α is the angle between the first intersection and the U axis in the co-ordinate system O-UVW plus 180 °, where α = arctan (v/U) +180 °.
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| CN202110331590.6A CN115143924A (en) | 2021-03-29 | 2021-03-29 | Method for measuring concentricity of rotor disc center |
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| CN202110331590.6A CN115143924A (en) | 2021-03-29 | 2021-03-29 | Method for measuring concentricity of rotor disc center |
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