Method for Measuring Concentricity of Rotor Disk Center

Abstract

The present invention relates to a method for measuring the concentricity of a rotor disc center, comprising the following steps: measuring the radial runout data R1 of the front journal reference C of the high-pressure compressor rotor; measuring the radial runout data R2 of the disc center of the labyrinth disc installed on the rear journal of the high-pressure compressor rotor and the end face runout data T2 of the labyrinth disc; assembling the high-pressure compressor rotor to the stator casing, and assembling the high-pressure turbine rotor to the high-pressure compressor rotor, wherein the front journal of the high-pressure turbine rotor is connected to the rear journal of the high-pressure compressor rotor; measuring the radial runout data R3 of the rear journal reference D of the high-pressure turbine rotor; measuring the radial runout data R2d of the disc center of the labyrinth disc and the end face runout data T2d of the labyrinth disc; obtaining the concentricity of the disc center of the labyrinth disc relative to the front journal reference of the high-pressure compressor rotor and the rear journal reference of the high-pressure turbine rotor through an algorithm, improving the measurement accuracy of the concentricity of the labyrinth disc.

Description

Technical Field

[0001] The present invention relates to the field of aerospace technology, and particularly to a method for measuring the concentricity of a rotor disk center. Background Art

[0002] During the general assembly process of an aeroengine, after the high-pressure turbine rotor is assembled to the high-pressure compressor rotor, it is necessary to measure the runout of the labyrinth disk center with the front journal and the rear journal supports as the references, so as to obtain the concentricity of the labyrinth disk center relative to the front and rear references. As Figure 1 shown, the front journal reference is defined as C and the rear journal reference is defined as D here. However, during the measurement process, the support state of the high-pressure rotor is in a vertical state. Affected by the angular runout of the two supports at the references C and D, the rotating shaft of the high-pressure rotor cannot rotate along a fixed rotating shaft, and the rotation axis is not the rotating shaft in the engine working state. This results in the inability to obtain the accurate concentricity of the labyrinth disk center relative to the front and rear references by the traditional method (fixing the reference C with a bearing and fixing the reference D with a roller), and the overall measurement structure will cause a significant error in the measurement result. Summary of the Invention

[0003] Some embodiments of the present invention provide a method for measuring the concentricity of a rotor disk center to alleviate the problem of large measurement error of the concentricity of the rotor disk center.

[0004] Some embodiments of the present invention provide a method for measuring the concentricity of a rotor disk center, which includes the following steps:

[0005] Measure the radial runout data R1 of the front journal reference C of the high-pressure compressor rotor;

[0006] Measure the radial runout data R2 of the center of the labyrinth disk and the end face runout data T2 of the labyrinth disk installed on the rear journal of the high-pressure compressor rotor;

[0007] Assemble the high-pressure compressor rotor to the stator casing, and assemble the high-pressure turbine rotor to the high-pressure compressor rotor, wherein the front journal of the high-pressure turbine rotor is connected to the rear journal of the high-pressure compressor rotor;

[0008] Measure the radial runout data R3 of the rear journal reference D of the high-pressure turbine rotor;

[0009] Measure the radial runout data R2d of the center of the labyrinth disk and the end face runout data T2d of the labyrinth disk;

[0010] Establish a coordinate system O-XYZ with the radial runout data R2 of the center of the labyrinth disk and the end face runout data T2 of the labyrinth disk; convert the radial runout data R1 of the reference C according to the pose matrix generated during the establishment of the coordinate system, and convert it to the established coordinate system O-XYZ to obtain the runout value , , , , ,

[0005] ,

[0010] , X ,

[0009] ,

[0008] ,

[0007] ,

[0006] R1 of the radial runout data R1 in the coordinate system O-XYZ;

[0011] Establish a coordinate system O-UVW with the radial runout data R2d of the labyrinth disc center and the end face runout data T2d of the labyrinth disc; convert the radial runout data R3 of the reference D according to the pose matrix generated during the establishment of the coordinate system, and convert it to the established coordinate system O-UVW to obtain the runout value of the radial runout data R3 in the coordinate system O-UVW U R3;

[0012] It is verified that the coordinate system O-XYZ coincides with the coordinate system O-UVW;

[0013] Connect X R1 and U R3 into a straight line. The straight line has a first intersection point with the UV plane of the coordinate system O-UVW. The distance between the first intersection point and the origin of the coordinate system O-UVW is the concentricity amplitude value; alternatively, the straight line has a second intersection point with the XY plane of the coordinate system O-XYZ. The distance between the second intersection point and the point of the coordinate system O-XYZ is the concentricity amplitude value;

[0014] The concentricity deviation angle is the angle between the first intersection point and the U axis in the coordinate system O-UVW plus 180°; alternatively, the concentricity deviation angle is the angle between the second intersection point and the X axis in the coordinate system O-XYZ plus 180°.

[0015] In some embodiments, the method for establishing the coordinate system O-XYZ includes: using the least squares method to fit the radial runout data R2 of the labyrinth disc center, and the center of the fit is the origin of the coordinate system O-XYZ.

[0016] In some embodiments, the fitting of the radial runout data R2 of the labyrinth disc center by using the least squares method is implemented by the following formula:

[0017]

[0018] where f is the least squares function;

[0019] x O(1) is the origin x The x coordinate of O;

[0020] x O(2) is the origin x The Y coordinate of O;

[0021] r is the distance between the radial runout measurement position of the labyrinth disc center and the central axis of the rotor;

[0022] θ is the angle corresponding to the radial runout of the labyrinth disc center.

[0023] In some embodiments, the method for establishing the coordinate system O-XYZ further includes: combining the end face runout data T2 of the labyrinth disc with the least squares method to fit a plane, using the plane normal vector as the Z-axis, and using the direction where the starting measurement point of the radial runout of the labyrinth disc is located as the X-axis.

[0024] In some embodiments, the combination of the end face runout data T2 of the labyrinth disc with the least squares method to fit a plane is achieved by using the following formula:

[0025]

[0026] In the formula, g is the least squares function;

[0027] x Z(1) is x the x coordinate of the Z vector;

[0028] x Z(2) is x the y coordinate of the Z vector;

[0029] x Z(3) is x the z coordinate of the Z vector;

[0030] R is the distance between the end face runout measurement position of the labyrinth disc and the central axis of the rotor;

[0031] β is the angle corresponding to the end face runout of the labyrinth disc.

[0032] In some embodiments, the method for establishing the coordinate system O-UVW includes: using the least squares method to fit the radial runout data R2d of the center of the labyrinth disc, and the center of the fit is the origin of the coordinate system O-UVW.

[0033] In some embodiments, the method for establishing the coordinate system O-UVW further includes: combining the end face runout data T2d of the labyrinth disc with the least squares method to fit a plane, using the plane normal vector as the W-axis, and using the direction where the starting measurement point of the radial runout of the labyrinth disc is located as the U-axis.

[0034] In some embodiments, the distance P between the first intersection point and the origin of the coordinate system O-UVW is the concentricity amplitude value, where

[0035] In some embodiments, the concentricity deviation angle α is the angle between the first intersection point and the U-axis in the coordinate system O-UVW plus 180°, where α = arctan(v / u) + 180°.

[0036] Based on the above technical solutions, the present invention has at least the following beneficial effects:

[0037] In some embodiments, before assembling the high-pressure compressor rotor and the high-pressure turbine rotor, the radial runout data of the front journal reference of the high-pressure compressor rotor, the radial runout data of the center of the labyrinth disc, and the end face runout data of the labyrinth disc are measured. After assembling the high-pressure compressor rotor and the high-pressure turbine rotor, the radial runout data of the rear journal reference of the high-pressure turbine rotor, the radial runout data of the center of the labyrinth disc, and the end face runout data are measured. Through an algorithm, the concentricity of the center of the labyrinth 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, improving the measurement accuracy of the concentricity of the labyrinth disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0039] Figure 1 FIG. is a schematic structural diagram of the rotor runout position according to some embodiments of the present invention;

[0040] Figure 2 FIG. is a schematic diagram of the measurement positions of the high-pressure compressor rotor unit body state runout according to some embodiments of the present invention;

[0041] Figure 3 FIG. is a simplified structural diagram of the high-pressure turbine rotor according to some embodiments of the present invention;

[0042] Figure 4 FIG. is a simplified structural diagram of the stator casing according to some embodiments of the present invention;

[0043] Figure 5 FIG. is a schematic diagram of the measurement positions of the rotor total assembly state runout according to some embodiments of the present invention;

[0044] Figure 6 FIG. is a schematic flow diagram of the method for measuring the concentricity of the rotor disc center according to some embodiments of the present invention.

[0045] The reference numerals in the drawings are explained as follows:

[0046] 1 - High-pressure compressor rotor;

[0047] 2 - High-pressure turbine rotor;

[0048] 3 - Labyrinth disc;

[0049] 4 - Stator casing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] The following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention.

[0052] As Figure 1 shown, the rotor system includes a high-pressure compressor rotor 1 and a high-pressure turbine rotor 2, and a labyrinth disc 3 is installed on the high-pressure compressor rotor 1. The specific assembly method of the rotor system includes: assembling the high-pressure compressor rotor 1 and the high-pressure compressor stator into a high-pressure compressor unit (as Figure 2 shown), and then assembling the high-pressure compressor unit to the combustion chamber stator casing 3 (the combustion chamber stator casing is as Figure 4 shown), and finally, assembling the high-pressure turbine rotor 2 (as Figure 3 shown) to the high-pressure compressor rotor 1 (as Figure 5 shown).

[0053] As Figure 2 shown, the labyrinth disc 3 has been installed on the high-pressure compressor rotor 1, and Figure 2 shows the measurement positions of the radial runout data R1 of the front journal reference C of the high-pressure compressor rotor 1, as well as the measurement positions of the radial runout data R2 of the center of the labyrinth disc 3 and the axial runout data T2 of the labyrinth disc 3.

[0054] As Figure 5 shown, it shows the measurement positions of the radial runout data R2d of the center of the labyrinth disc 3 and the axial runout data T2d of the labyrinth disc 3, and the measurement position of the radial runout data R3 of the rear journal reference D of the high-pressure turbine rotor 2. 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 in close contact with the rear end face of the labyrinth disc 3.

[0055] The rotor disc center concentricity measurement method provided by some embodiments of the present disclosure is used to measure the concentricity of the center of the labyrinth disc relative to the front and rear fulcrums under the assembly of the entire core engine of an aeroengine.

[0056] As Figure 6As shown, in some embodiments, the method for measuring the concentricity of the rotor disk center includes the following steps:

[0057] As Figure 2 shown, measure the radial runout data R1 of the front journal reference C of the high-pressure compressor rotor 1;

[0058] As Figure 2 shown, measure the radial runout data R2 of the center of the labyrinth disk 3 mounted on the rear journal of the high-pressure compressor rotor 1 and the end face runout data T2 of the labyrinth disk 3;

[0059] Assemble the high-pressure compressor rotor 1 to the stator casing 4, and assemble the high-pressure turbine rotor 2 to the high-pressure compressor rotor 1, wherein the front journal of the high-pressure turbine rotor 2 is connected to the rear journal of the high-pressure compressor rotor 1, as Figure 5 shown;

[0060] As Figure 5 shown, measure the radial runout data R3 of the rear journal reference D of the high-pressure turbine rotor 2;

[0061] As Figure 5 shown, measure the radial runout data R2d of the center of the labyrinth disk 3 and the end face runout data T2d of the labyrinth disk 3;

[0062] Establish a coordinate system O-XYZ with the radial runout data R2 of the center of the labyrinth disk 3 and the end face runout data T2 of the labyrinth disk 3; convert the radial runout data R1 of the reference C according to the pose matrix generated during the establishment of the coordinate system, and convert it to the established coordinate system O-XYZ to obtain the runout value of the radial runout data R1 in the coordinate system O-XYZ X R1;

[0063] Establish a coordinate system O-UVW with the radial runout data R2d of the center of the labyrinth disk 3 and the end face runout data T2d of the labyrinth disk 3; convert the radial runout data R3 of the reference D according to the pose matrix generated during the establishment of the coordinate system, and convert it to the established coordinate system O-UVW to obtain the runout value of the radial runout data R3 in the coordinate system O-UVW U R3;

[0064] It is verified that the coordinate system O-XYZ coincides with the coordinate system O-UVW;

[0065] Connect X R1 and U R3 into a straight line. The straight line has a first intersection with the UV plane of the coordinate system O-UVW, and the distance between the first intersection and the origin of the coordinate system O-UVW is the concentricity amplitude value; alternatively, the straight line has a second intersection with the XY plane of the coordinate system O-XYZ, and the distance between the second intersection and the point of the coordinate system O-XYZ is the concentricity amplitude value;

[0066] The concentricity deviation angle is the angle between the first intersection point and the U-axis in the coordinate system O-UVW plus 180°; alternatively, the concentricity deviation angle is the angle between the second intersection point and the X-axis in the coordinate system O-XYZ plus 180°.

[0067] Before assembling the high-pressure compressor rotor 1 and the high-pressure turbine rotor 2, the present disclosure provides an embodiment to measure the radial runout data R1 of the front journal reference C of the high-pressure compressor rotor 1, the radial runout data R2 of the center of the labyrinth disc 3, and the end face runout data T2 of the labyrinth disc 3; after assembling the high-pressure compressor rotor 1 and the high-pressure turbine rotor 2, measure the radial runout data R3 of the rear journal reference D of the high-pressure turbine rotor 2, the radial runout data R2d of the center of the labyrinth disc 3, and the end face runout data T2d. By establishing coordinates and corresponding algorithms, the concentricity and runout of the center of the labyrinth disc relative to the front journal reference C of the high-pressure compressor rotor 1 and the rear journal reference D of the high-pressure turbine rotor 2 can be quickly obtained, improving the measurement accuracy of the runout and concentricity of the center of the labyrinth disc, reducing the angular swing error of the rotation axis of the center of the labyrinth disc during the measurement process, making the rotation axis during the measurement of the runout of the center of the labyrinth disc collinear with the rotor center axis, and being able to measure the runout concentricity of the rotor disc relative to the rotating shaft in the whole-machine state of the rotor disc center, greatly reducing the production and processing costs.

[0068] In some embodiments, the method for establishing the coordinate system O-XYZ includes: using the least squares method to fit the radial runout data R2 of the center of the labyrinth disc 3, and the fitted center is the origin of the coordinate system O-XYZ.

[0069] In some embodiments, the use of the least squares method to fit the radial runout data R2 of the center of the labyrinth disc 3 is implemented using the following formula:

[0070]

[0071] where f is the least squares function;

[0072] x O(1) is the origin x The x coordinate of O;

[0073] x O(2) is the origin x The Y coordinate of O;

[0074] r is the distance between the measurement position of the radial runout of the center of the labyrinth disc 3 and the center axis of the rotor;

[0075] θ is the angle corresponding to the radial runout of the center of the labyrinth disc 3.

[0076] In some embodiments, the method for establishing the coordinate system O-XYZ further includes: combining the end face runout data T2 of the labyrinth disc 3 with the least squares method to fit a plane, using the plane normal vector as the Z-axis (positive in the flight direction), and using the direction where the starting measurement point of the radial runout of the labyrinth disc 3 is located as the X-axis.

[0077] In some embodiments, the combination of the end face runout data T2 of the labyrinth disc 3 with the least squares method to fit a plane is implemented using the following formula:

[0078]

[0079] In the formula, g is the least squares function;

[0080] x Z(1) is x the x coordinate of the Z vector;

[0081] x Z(2) is x the y coordinate of the Z vector;

[0082] x Z(3) is x the z coordinate of the Z vector;

[0083] R is the distance between the end face runout measurement position of the labyrinth disc 3 and the center line of the rotor;

[0084] β is the angle corresponding to the end face runout of the labyrinth disc 3.

[0085] In some embodiments, the method for establishing the coordinate system O-UVW includes: using the least squares method to fit the radial runout data R2d of the center of the labyrinth disc 3, and the center of the fit is the origin of the coordinate system O-UVW.

[0086] In some embodiments, the method for establishing the coordinate system O-UVW further includes: combining the end face runout data T2d of the labyrinth disc 3 with the least squares method to fit a plane, using the plane normal vector as the W-axis, and using the direction where the starting measurement point of the radial runout of the labyrinth disc 3 is located as the U-axis.

[0087] In some embodiments, the distance P between the first intersection point and the origin of the coordinate system O-UVW is the concentricity amplitude value, where

[0088] In some embodiments, the concentricity deviation angle α is the angle between the first intersection point and the U-axis in the coordinate system O-UVW plus 180°, where α = arctan(v / u) + 180°.

[0089] The following lists a specific embodiment of the rotor center concentricity measurement method. In this specific embodiment, the rotor center concentricity measurement method includes the following steps:

[0090] First, in the state of the high-pressure compressor rotor unit, measure the radial runout data R1 of the front journal reference C of the high-pressure compressor rotor 1. While measuring the runout of the front journal reference C, measure the radial runout data R2 of the center of the labyrinth disc 3 and the end face runout data T2 of the labyrinth disc 3, as Figure 2 shown.

[0091] During the whole-machine assembly process, after completing the assembly of the high-pressure turbine rotor 2 to the high-pressure compressor rotor 1, measure the radial runout data R3 of the rear journal reference D of the high-pressure turbine rotor 2. While measuring the runout of the rear journal reference D, use the measuring tooling to measure the radial runout data R2d of the center of the labyrinth disc 3 and the end face runout data T2d of the labyrinth disc 3, as Figure 5 shown.

[0092] Next, calculate using the measured runout data:

[0093] Using the runout data of the high-pressure compressor rotor unit, establish a coordinate system O-XYZ with the radial runout data R2 of the center of the labyrinth disc 3 and the end face runout data T2 of the labyrinth disc 3. The establishment principle is as follows: Use the least squares method to fit the radial runout data R2 of the center of the labyrinth disc 3, and the center of the fit is the origin of the coordinate system O-XYZ, see formula (1). Combine the end face runout data T2 of the labyrinth disc 3 with the least squares fitting plane, and use the plane normal vector (positive in the forward flight direction) as the Z-axis, see formula (2). Use the direction where the starting measurement point of the radial runout of the labyrinth disc 3 is located as the X-axis, and make an X-axis mark.

[0094] Note: The starting measurement point of the radial runout of the labyrinth disc 3 is consistent with the rotational angle where the starting measurement point of the radial runout of the front journal reference C of the high-pressure compressor rotor 1 is located.

[0095] X O = fitcircle(R2) (1)

[0096] X Z = fitplane(T2) (2)

[0097] Convert the radial runout data R1 of the reference C according to the pose matrix generated during the coordinate system establishment process to the established coordinate system O-XYZ, and obtain the runout value of the radial runout data R1 in the coordinate system O-XYZ X R1.

[0098] Using the runout data during the overall machine assembly process, a coordinate system O-UVW is established with the radial runout data R2d of the center of the labyrinth disc 3 and the end face runout data T2d of the labyrinth disc 3. The establishment principle is as follows: The least squares method is used to fit the radial runout data R2d of the center of the labyrinth disc 3, and the center of the fitted circle is the origin of the coordinate system O-UVW, as shown in formula (3). The end face runout data T2d of the labyrinth disc 3 is combined with the least squares fitted plane, and the plane normal vector (positive in the forward flight direction) is used as the W axis, as shown in formula (4). The direction where the X-axis mark identified by the high-pressure rotor unit state is located is used as the U axis.

[0099] Note: The starting measurement point of the radial runout of the labyrinth disc 3 is consistent with the rotational angle of the starting measurement point of the radial runout of the rear journal reference D of the high-pressure turbine rotor 2.

[0100] U O = fitcircle(R2d) (3)

[0101] U Z = fitplane(T2d) (4)

[0102] The radial runout data R3 of the reference D is transformed according to the pose matrix generated during the coordinate system establishment process and transformed to the established coordinate system O-UVW to obtain the runout value of the radial runout data R3 in the coordinate system O-UVW. U R3.

[0103] It is verified that the coordinate system O-UVW coincides with the coordinate system O-XYZ.

[0104] Connect X R1 and U R3 into a straight line. The straight line has a first intersection point with the UV plane of the coordinate system O-UVW. The distance between the first intersection point and the origin of the coordinate system O-UVW is the concentricity amplitude value; alternatively, the straight line has a second intersection point with the XY plane of the coordinate system O-XYZ. The distance between the second intersection point and the point of the coordinate system O-XYZ is the concentricity amplitude value.

[0105] The concentricity deviation angle is the angle between the first intersection point and the U axis in the coordinate system O-UVW plus 180°; alternatively, the concentricity deviation angle is the angle between the second intersection point and the X axis in the coordinate system O-XYZ plus 180°.

[0106] For example: If the coordinates of the first intersection point are (u, v, 0), then the concentricity amplitude value P and the concentricity deviation angle α are respectively formulas (5) and (6).

[0107]

[0108] α = arctan(v / u) + 180° (6)

[0109] The embodiments provided by the present disclosure utilize the detection of reference runout data to improve the accuracy of the relative runout of the center of the labyrinth disc with respect to the reference; utilize the change in runout data caused by the axis swing for compensation to repair the angular swing error; and utilize the rotational data for constructing the axis fitting to fit and simulate the rotation of the rotor.

[0110] Based on the above embodiments of the present invention, in the absence of an explicit negation, the technical features of one embodiment can be beneficially combined with one or more other embodiments.

[0111] In the description of the present invention, it should be understood that the use of terms such as "first", "second", "third", etc. to limit the components is only for the convenience of distinguishing the above components. Without additional statements, the above terms have no special meanings, and thus cannot be construed as limiting the protection scope of the present invention.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A method for measuring the concentricity of the rotor disc center, characterized in that, The steps include: Measuring the radial runout data R1 of the front journal reference C of the high-pressure compressor rotor (1); Measuring the radial runout data R2 of the center of the labyrinth disc (3) installed on the rear journal of the high-pressure compressor rotor (1) and the end face runout data T2 of the labyrinth disc (3); 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 the front journal of the high-pressure turbine rotor (2) is connected to the rear journal of the high-pressure compressor rotor (1); Measuring the radial runout data R3 of the rear journal reference D of the high-pressure turbine rotor (2); Measuring the radial runout data R2d of the center of the labyrinth disc (3) and the end face runout data T2d of the labyrinth disc (3); Establish a coordinate system O-XYZ with the radial runout data R2 of the root disc (3) and the end face runout data T2 of the root disc (3); convert the radial runout data R1 of the reference C according to the pose matrix generated during the establishment of the coordinate system to the established coordinate system O-XYZ, and obtain the runout value of the radial runout data R1 in the coordinate system O-XYZ X R1; Establish a coordinate system O-UVW with the radial runout data R2d of the root disk (3) and the end face runout data T2d of the root disk (3); convert the radial runout data R3 of the reference D according to the pose matrix generated during the establishment of the coordinate system, and convert it to the established coordinate system O-UVW to obtain the runout value of the radial runout data R3 in the coordinate system O-UVW U R3; After verification, the coordinate system O-XYZ coincides with the coordinate system O-UVW; Connect X R1 and U R3 into a straight line. The straight line has a first intersection point with the UV plane of the coordinate system O-UVW, and the distance between the first intersection point and the origin of the coordinate system O-UVW is the concentricity amplitude value; alternatively, the straight line has a second intersection point with the XY plane of the coordinate system O-XYZ, and the distance between the second intersection point and the point of the coordinate system O-XYZ is the concentricity amplitude value. The concentricity deviation angle is the angle between the first intersection point and the U-axis in the coordinate system O-UVW plus 180°; or, the concentricity deviation angle is the angle between the second intersection point and the X-axis in the coordinate system O-XYZ plus 180°.

2. The rotor disk center concentricity measurement method according to claim 1, characterized in that The method for establishing the coordinate system O-XYZ includes: Using the least squares method to fit the radial runout data R2 of the center of the labyrinth disc (3), and the center of the fit is the origin of the coordinate system O-XYZ.

3. The rotor disk center concentricity measurement method according to claim 2, characterized in that The use of the least squares method to fit the radial runout data R2 of the center of the labyrinth disc (3) is realized by the following formula: Where f is the least squares function; x O(1) is the origin x The x - coordinate of O; x O(2) is the origin x The Y coordinate of O; r is the distance between the radial runout measurement position of the center of the labyrinth disc (3) and the central axis of the rotor; θ is the angle corresponding to the radial runout of the center of the labyrinth disc (3).

4. The rotor disk center concentricity measurement method according to claim 2, characterized in that The method for establishing the coordinate system O-XYZ also includes: Combining the end face runout data T2 of the labyrinth disc (3) with the least squares method to fit a plane, taking the plane normal vector as the Z-axis, and taking the direction where the starting measurement point of the radial runout of the labyrinth disc (3) is located as the X-axis.

5. The rotor disk center concentricity measurement method according to claim 4, characterized in that, The combination of the end face runout data T2 of the labyrinth disc (3) with the least squares method to fit a plane is realized by the following formula: In the formula, g is the 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 runout measurement position of the labyrinth disc (3) and the central axis of the rotor; β is the angle corresponding to the end face runout of the labyrinth disc (3).

6. The rotor disk center concentricity measurement method according to claim 1, characterized in that The method for establishing the coordinate system O-UVW includes: Using the least squares method to fit the radial runout data R2d of the center of the labyrinth disc (3), and the center of the fit is the origin of the coordinate system O-UVW.

7. The rotor disk center concentricity measurement method according to claim 6, wherein, The method for establishing the coordinate system O-UVW also includes: Combining the end face runout data T2d of the labyrinth disc (3) with the least squares method to fit a plane, taking the plane normal vector as the W-axis, and taking the direction where the starting measurement point of the radial runout of the labyrinth disc (3) is located as the U-axis.

8. The rotor disk center concentricity measurement method according to claim 1, characterized in that The distance P between the first intersection point and the origin of the coordinate system O-UVW is the concentricity amplitude value, where The coordinates of the first intersection point are (u, v, 0).

9. The rotor disk center concentricity measurement method according to claim 1, characterized in that, The concentricity deviation angle α is the angle between the first intersection point and the U-axis in the coordinate system O-UVW plus 180°, where α = arctan(v / u) + 180°, and the coordinates of the first intersection point are (u, v, 0).

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