Method for estimating combined rotor offset parameters, rotor assembly method, and rotor

Abstract

The application discloses a combined rotor offset parameter estimation method, a rotor assembling method and a rotor. The combined rotor offset parameter estimation method comprises the following steps: constructing a two-dimensional first model for representing a first rotor; constructing a two-dimensional second model for representing a second rotor; splicing the first model and the second model to form a third model for representing a combined rotor; and calculating the gravity center offset or the deflection angle according to the geometric parameters of the third model. The first rotor and the second rotor are simplified into two-dimensional models, and the gravity center offset and the deflection angle of the combined rotor are calculated by using a plane geometry method in a two-dimensional plane. Compared with the prior art, the calculation is simpler, and the operation is more convenient.

Description

Technical Field

[0001] This invention relates to the field of aero-engines, and in particular to a method for estimating combined rotor offset parameters, a rotor assembly method, and a rotor. Background Technology

[0002] Studies have shown that the magnitude of the initial unbalance of the rotor is one of the key factors in controlling the overall rotor vibration level of an aero-engine. In order to effectively control the initial unbalance of the combined rotor, it is necessary to digitally model the process parameters of the combined rotor assembly process and establish estimation methods for the rotor center of gravity offset and deflection angle in the combined state, so as to establish a mathematical analysis basis for predicting the initial unbalance of the rotor.

[0003] Existing methods for calculating the center of gravity offset and deflection angle of a combined rotor involve rotating the rotor on a test bench, sampling parameters at multiple points during rotation, and fitting these parameters to obtain the center of gravity offset and deflection angle. This method has the following drawbacks:

[0004] The rotor needs to be placed on the test bench for testing, which is cumbersome; the calculation process is complex and tedious, and it requires high computing resources. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art in terms of cumbersome operation and complicated calculation of center of gravity offset and deflection angle, and to provide a method for estimating combined rotor offset parameters, rotor assembly method and rotor.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] A method for estimating offset parameters of a combined rotor, wherein the combined rotor is composed of a first rotor and a second rotor spliced ​​together, the offset parameters include a center of gravity offset or a deflection angle, the center of gravity offset being the distance between the center of gravity of the first rotor or the second rotor and the axis of the combined rotor, and the deflection angle being the angle between the axis of the first rotor or the second rotor and the axis of the combined rotor, characterized by comprising the following steps:

[0008] The axis of the first rotor is simplified to a first axis, and the mating surface of the first rotor is simplified to a first straight line intersecting the endpoint of the first axis. A first model for characterizing the first rotor is constructed using the first straight line and the first axis.

[0009] The axis of the second rotor is simplified to a second axis, and the mating surface of the second rotor is simplified to a second straight line intersecting the endpoint of the second axis. A second model for characterizing the second rotor is constructed using the second straight line and the second axis.

[0010] The first and second models are combined to form a third model for characterizing the combined rotor;

[0011] The center of gravity offset or deflection angle is calculated based on the geometric parameters of the third model.

[0012] This invention simplifies the first and second rotors into two-dimensional models, and uses plane geometry to calculate the center of gravity offset and deflection angle of the combined rotor in a two-dimensional plane. Compared with the prior art, the calculation is simpler and the operation is more convenient.

[0013] Preferably, the step of calculating the centroid offset based on the geometric parameters of the third model includes:

[0014] Obtain the geometric parameters L 11 L 21 L 12 L 22 , Δ1, Δ2, D, where L 11 L is the distance between the center of gravity of the first rotor on the first axis and the non-intersecting ends. 12 L is the distance between the center of gravity of the first rotor on the first axis and the intersecting end. 21 L is the distance between the center of gravity of the second rotor on the second axis and the intersecting end. 22 Δ1 is the distance between the center of gravity of the second rotor on the second axis and the non-intersecting end, Δ2 is the axial distance between the two ends of the first straight line relative to the first axis, and D is the axial distance between the two ends of the second straight line relative to the second axis.

[0015] The offset R of the first rotor's center of gravity is obtained through the geometric relationship of the third model. 11 And the center of gravity offset R of the second rotor 21 With geometric parameter L 11 L 21 L 12 L 22 The relationship between Δ1, Δ2, and D.

[0016] This enables the calculation of the center of gravity offset.

[0017] Preferably, the center of gravity offset R of the first rotor is obtained through the geometric relationship of the third model. 11 And the center of gravity offset R of the second rotor 21 With geometric parameter L 11 L 21 L 12 L 22 The steps to establish the relationship between Δ1, Δ2, and D also include:

[0018] Introduce intermediate parameters H and K, where H is the distance between the overlapping ends of the first and second axes and the combined rotor axis, and K is the distance between the non-intersecting ends of the second axis and the first axis.

[0019] Establish H and L 11 L 12 and R 11 The geometric relationship between H and L 21 L 22 and R 21 Geometric relationship between K and L; 21 L 22 The geometric relationships between Δ1, Δ2, and D, and the relationships between H and K and L. 11 L 21 L 12 L 22 The geometric relationship between them

[0020] R is obtained by simultaneously solving H and K. 11 and R 21 With geometric parameter L 11 L 21 L 12 L 22 The relationship between Δ1, Δ2, and D.

[0021] By introducing intermediate parameters H and K, the center of gravity offset can be calculated more conveniently and quickly.

[0022] Preferably, the step of calculating the centroid offset based on the geometric parameters of the third model includes:

[0023] Obtain the geometric parameters L 11 L 21 L 12 L 22 , Δ1, Δ2, D, where L 11 L is the distance between the center of gravity of the first rotor on the first axis and the non-intersecting ends. 12 L is the distance between the center of gravity of the first rotor on the first axis and the intersecting end. 21 L is the distance between the center of gravity of the second rotor on the second axis and the intersecting end. 22 Δ1 is the distance between the center of gravity of the second rotor on the second axis and the non-intersecting end, Δ2 is the axial distance between the two ends of the first straight line relative to the first axis, and D is the axial distance between the two ends of the second straight line relative to the second axis.

[0024] The deflection angle α of the first rotor and the deflection angle β of the second rotor, along with the geometric parameter L, are obtained through the geometric relationship of the third model. 11 L 21 L 12 L22 The relationship between Δ1, Δ2, and D.

[0025] Preferably, the deflection angle α of the first rotor and the deflection angle β of the second rotor, along with the geometric parameter L, are obtained through the geometric relationship of the third model. 11 L 21 L 12 L 22 The steps to establish the relationship between Δ1, Δ2, and D also include:

[0026] Introduce intermediate parameters H and K, where H is the distance between the overlapping ends of the first and second axes and the combined rotor axis, and K is the distance between the non-intersecting ends of the second axis and the first axis.

[0027] Establish H and L 11 L 12 The geometric relationship between H and α, and H and L 21 L 22 Geometric relationship between K and β; K and L 21 L 22 The geometric relationships between Δ1, Δ2, and D, and the relationships between H and K and L. 11 L 21 L 12 L 22 The geometric relationship between them

[0028] α and β, along with the geometric parameter L, are obtained by simultaneously solving the equations for H and K. 11 L 21 L 12 L 22 The relationship between Δ1, Δ2, and D.

[0029] By introducing intermediate parameters H and K, the deflection angle can be calculated more conveniently and quickly.

[0030] Preferably, the steps for establishing the third model include:

[0031] The first and second straight lines are joined together, and the endpoints where the first axis intersects the first straight line and the second axis intersects the second straight line are aligned.

[0032] Therefore, it is possible to simulate the shape of the joint surface of the first rotor and the second rotor, and realize the two-dimensional simplification of the combined rotor.

[0033] Preferably, the third model includes a third axis, which is the line connecting the non-intersecting ends of the first axis and the second axis, and the third axis is used to characterize the axis of the combined rotor.

[0034] Preferably, the first straight line is the center line of the first rotor mating surface with the largest axial distance between its two ends, and the second straight line is the center line of the second rotor mating surface with the largest axial distance between its two ends. This arrangement allows for the acquisition of the maximum and minimum values ​​of the deflection angle and the center of gravity offset, providing greater reference value for subsequent assembly.

[0035] The present invention also provides a rotor assembly method, which uses the estimation method of combined rotor center of gravity offset and deflection angle as described above to estimate the rotor center of gravity offset and deflection angle.

[0036] The present invention also provides a rotor manufactured using the rotor assembly method described above.

[0037] The positive and progressive effects of this invention are as follows:

[0038] The first and second rotors are simplified into two-dimensional models. The center of gravity offset and deflection angle of the combined rotor are calculated using plane geometry in a two-dimensional plane. Compared with existing technologies, the calculation is simpler and the operation is more convenient. Attached Figure Description

[0039] Figure 1 This is a three-dimensional view of the first rotor;

[0040] Figure 2 This is a three-dimensional view of the second rotor;

[0041] Figure 3 This is a schematic diagram of the first model;

[0042] Figure 4 This is a schematic diagram of the second model;

[0043] Figure 5 This is a schematic diagram of the third model;

[0044] Explanation of reference numerals in the attached figures:

[0045] First rotor 10

[0046] Second rotor 20

[0047] Model 100

[0048] First axis 110

[0049] First straight line 120

[0050] Model 200

[0051] Second axis 210

[0052] Second straight line 220

[0053] Third Model 300

[0054] Third axis 310 Detailed Implementation

[0055] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0056] This invention provides a method for estimating the offset parameters of a combined rotor, which is constructed by splicing a first rotor 10 and a second rotor 20. In this invention, the first rotor 10 is a high-pressure compressor rotor, and the second rotor 20 is a high-pressure turbine rotor. The first rotor 10 and the second rotor 20 have a mating surface with the same diameter to allow them to be spliced ​​together to form the combined rotor. The offset parameters to be estimated in this invention include the center of gravity offset and the deflection angle. The center of gravity offset is the distance between the center of gravity of the first rotor 10 or the second rotor 20 and the axis of the combined rotor, and the deflection angle is the angle between the axes of the first rotor 10 and the second rotor 20 and the axis of the combined rotor.

[0057] The method for estimating this offset parameter specifically includes the following steps:

[0058] Combination Figure 1 and Figure 3 The axis of the first rotor 10 is simplified to the first axis 110, and the mating surface of the first rotor 10 is simplified to the first straight line 120 intersecting the endpoint of the first axis 110. The first model 100 for characterizing the first rotor 10 is constructed through the first straight line 120 and the first axis 110. Specifically, one end of the first axis 110 is the support point of the first rotor 10, and the other end extends to the center of the mating surface of the first rotor 10. The first straight line 120 passes through the center of the mating surface of the first rotor 10, and its length is consistent with the diameter D of the mating surface of the first rotor 10.

[0059] Combination Figure 2 and Figure 4 The axis of the second rotor 20 is simplified to the second axis 210, and the mating surface of the second rotor 20 is simplified to the second straight line 220 intersecting the endpoint of the second axis 210. A second model 200 for characterizing the second rotor 20 is constructed through the second straight line 220 and the second axis 210. Specifically, one end of the second axis 210 is the support point of the second rotor 20, and the other end extends to the center of the mating surface of the second rotor 20. The second straight line 220 is a line passing through the center of the mating surface of the second rotor 20, and its length is consistent with the diameter D of the mating surface of the second rotor 20.

[0060] Combination Figure 5The first model 100 and the second model 200 are spliced ​​together to form a third model 300 for representing the combined rotor. Specifically, the first straight line 120 and the second straight line 220 are spliced ​​together to represent the state in which the joint surfaces of the first rotor 10 and the second rotor 20 are spliced ​​together. At this time, the endpoints of the first axis 110 and the first straight line 120 and the second axis 210 and the second straight line 220 coincide with each other. The line connecting the endpoints of the first axis 110 and the second axis 210 for representing the support point constitutes the third axis 310 for representing the axis of the combined rotor.

[0061] The center of gravity offset or deflection angle is calculated based on the geometric parameters of the third model 300.

[0062] This invention simplifies the three-dimensional first rotor 10 and second rotor 20 into two-dimensional models, thereby obtaining a two-dimensional model of the combined rotor. Then, the center of gravity offset and deflection angle of the combined rotor are calculated in the two-dimensional plane using the planar geometry method. Compared with the existing multi-point sampling fitting calculation method or three-dimensional modeling fitting calculation method, the calculation difficulty is significantly reduced, and it has higher convenience and calculation efficiency, and the operation is also more convenient.

[0063] In this embodiment, the step of calculating the centroid offset based on the geometric parameters of the third model 300 specifically includes:

[0064] Measuring geometric parameters L 11 L 12 α1, Δ1, where L 11 L is the distance between the center of gravity of the first rotor 10 located on the first axis 110 and the support point (i.e., the end that does not intersect with the first straight line 120). 12 Δ1 is the distance from the center of gravity of the first rotor 10 on the first axis 110 to the mating surface (i.e., the distance to the end that intersects with the first straight line 120), Δ1 is the axial distance between the two ends of the first straight line 120 relative to the direction of the first axis 110, and α1 is the angle between the first straight line 120 and the direction perpendicular to the first axis 110.

[0065] Measuring geometric parameters L 21 L 22 , β2, Δ2, where L 21 L is the distance from the center of gravity of the second rotor 20 on the second axis 210 to the mating surface (i.e., the distance to the end that intersects with the second straight line 220). 22 Δ2 is the distance between the center of gravity of the second rotor 20 on the second axis 210 and the support point (i.e., the end that does not intersect with the second straight line 220), Δ2 is the axial distance between the two ends of the second straight line 220 relative to the direction of the second axis 210, and β2 is the angle between the second straight line 220 and the direction perpendicular to the second axis 210.

[0066] The center of gravity offset R of the first rotor 10 is obtained through the geometric relationship of the third model 300. 11 and the center of gravity offset R of the second rotor 20 21 With geometric parameter L 11 L 21 L 12 L 22 The relationship between Δ1, Δ2, and D;

[0067] Among them, the center of gravity offset R of the first rotor 10 11 Satisfy the following formula:

[0068]

[0069] The offset R of the center of gravity of the second rotor 20 21 Satisfy the following formula:

[0070]

[0071] This enables the calculation of the center of gravity offset.

[0072] Specifically in this embodiment, R 11 and R 21 The solution steps also include:

[0073] Introducing intermediate parameters H and K, where H is the distance between the overlapping ends of the first axis 110 and the second axis 210 and the combined rotor axis, and K is the distance between the non-intersecting ends of the second axis 210 and the first axis 110;

[0074] Establish K and L 21 L 22 The geometric relationships between Δ1, Δ2, and D satisfy the following formula:

[0075]

[0076] Specifically, the formula is derived as follows: Since the angles α1 and β2 are small, they satisfy the small angle formulas sinα1=α1, sinβ2=β2, which means:

[0077]

[0078]

[0079] Therefore, we can conclude that:

[0080]

[0081] Establish H and K, L 11 L 21 L12 L 22 The geometric relationship between them satisfies the following formula:

[0082]

[0083] Specifically, the formula is derived as follows: Since the angles α1 and β2 are small, they satisfy the small angle formula cos(α1+β2)=1. Based on the similar triangle theorem, we know that:

[0084]

[0085] Establish H and L 11 L 12 and R 11 The geometric relationship between them satisfies the following formula:

[0086]

[0087] This formula can be obtained using the similar triangle theorem, which will not be elaborated further here;

[0088] Establish H and L 21 L 22 and R 21 The geometric relationship between them satisfies the following relationship:

[0089]

[0090] This formula can be obtained using the similar triangle theorem, which will not be elaborated further here;

[0091] By combining equations (3) and (6), we can obtain equations (1) and (2).

[0092] Therefore, it can be seen that by introducing intermediate parameters H and K, the center of gravity offset can be calculated more conveniently and quickly.

[0093] In this embodiment, the step of calculating the deflection angle based on the geometric parameters of the third model 300 includes:

[0094] Obtain the geometric parameters L 11 L 21 L 12 L 22 Δ1, Δ2, D;

[0095] The deflection angle α of the first rotor 10 and the deflection angle β of the second rotor 20, along with the geometric parameter L, are obtained through the geometric relationship of the third model 300. 11 L 21 L 12 L 22 The relationship between Δ1, Δ2, and D;

[0096] The deflection angle α of the first rotor 10 satisfies the following formula:

[0097]

[0098] The deflection angle β of the second rotor 20 satisfies the following formula:

[0099]

[0100] Specifically, the deflection angle α of the first rotor 10 and the deflection angle β of the second rotor 20 are calculated as follows:

[0101] Introduce intermediate parameters H and K;

[0102] Establish K and L using formula (3) 21 L 22 The geometric relationships between Δ1, Δ2, and D;

[0103] Establish the relationship between H and K, L using formula (4) 11 L 21 L 12 L 22 The geometric relationship between them;

[0104] Establish H and L 11 L 12 The geometric relationship between α and α satisfies the following formula:

[0105]

[0106] The formula was derived in the following way:

[0107] Since the angle α is small, it satisfies the small angle formula tanα=α, and thus the following holds:

[0108]

[0109] Establish H and L 21 L 22 The geometric relationship between β and β satisfies the following formula:

[0110]

[0111] The formula was derived in the following way:

[0112] Since the angle of β is small, it satisfies the small angle formulas sinβ=β, cosβ=1, and thus the following holds:

[0113]

[0114] By solving equations (3), (4), (9), and (10) simultaneously, H and K are obtained to determine the deflection angle α of the first rotor 10 and the deflection angle β of the second rotor 20, along with the geometric parameter L. 11 L 21 L 12 L 22 The relationship between Δ1, Δ2, and D.

[0115] Therefore, it can be seen that by introducing intermediate parameters, the deflection angle can be calculated more conveniently and quickly.

[0116] In this embodiment, the first straight line 120 is the line passing through the center of the first rotor 10 mating surface with the largest axial distance between its two ends, and the second straight line 220 is the line passing through the center of the second rotor 20 mating surface with the largest axial distance between its two ends. This arrangement allows for the acquisition of the maximum and minimum values ​​of the deflection angle and the center of gravity offset, providing greater reference value for subsequent assembly.

[0117] The present invention also provides a rotor assembly method, which uses the estimation method of combined rotor center of gravity offset and deflection angle as described above to estimate the rotor center of gravity offset and deflection angle.

[0118] The present invention also provides a rotor manufactured using the rotor assembly method described above.

[0119] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A method for estimating offset parameters of a combined rotor, wherein the combined rotor is composed of a first rotor and a second rotor spliced ​​together, the offset parameters including a center of gravity offset or a deflection angle, the center of gravity offset being the distance between the center of gravity of the first rotor or the second rotor and the axis of the combined rotor, and the deflection angle being the angle between the axis of the first rotor or the second rotor and the axis of the combined rotor, characterized in that, Includes the following steps: The axis of the first rotor is simplified to a first axis, and the mating surface of the first rotor is simplified to a first straight line intersecting the endpoint of the first axis. A first model for characterizing the first rotor is constructed using the first straight line and the first axis. The axis of the second rotor is simplified to a second axis, and the mating surface of the second rotor is simplified to a second straight line intersecting the endpoint of the second axis. A second model for characterizing the second rotor is constructed using the second straight line and the second axis. The first and second models are combined to form a third model for characterizing the combined rotor; The center of gravity offset or deflection angle is calculated based on the geometric parameters of the third model. The steps for calculating the centroid offset based on the geometric parameters of the third model include: Obtain the geometric parameters L 11 L 21 L 12 L 22 , Δ1, Δ2, D, where L 11 L is the distance between the center of gravity of the first rotor on the first axis and the non-intersecting ends. 12 L is the distance between the center of gravity of the first rotor on the first axis and the intersecting end. 21 L is the distance between the center of gravity of the second rotor on the second axis and the intersecting end. 22 Δ1 is the distance between the center of gravity of the second rotor on the second axis and the non-intersecting end, Δ2 is the axial distance between the two ends of the first straight line relative to the first axis, and D is the axial distance between the two ends of the second straight line relative to the second axis. The offset R of the first rotor's center of gravity is obtained through the geometric relationship of the third model. 11 And the center of gravity offset R of the second rotor 21 With geometric parameter L 11 L 21 L 12 L 22 The relationship between Δ1, Δ2, and D.

2. The method for estimating the combined rotor offset parameters as described in claim 1, characterized in that: The offset R of the first rotor's center of gravity is obtained through the geometric relationship of the third model. 11 And the center of gravity offset R of the second rotor 21 With geometric parameter L 11 L 21 L 12 L 22 The steps to establish the relationship between Δ1, Δ2, and D also include: Introduce intermediate parameters H and K, where H is the distance between the overlapping ends of the first and second axes and the combined rotor axis, and K is the distance between the non-intersecting ends of the second axis and the first axis. Establish H and L 11 L 12 and R 11 The geometric relationship between H and L 21 L 22 and R 21 Geometric relationship between K and L; 21 L 22 The geometric relationships between Δ1, Δ2, and D, and the relationships between H and K and L. 11 L 21 L 12 L 22 The geometric relationship between them R is obtained by simultaneously solving H and K. 11 and R 21 With geometric parameter L 11 L 21 L 12 L 22 The relationship between Δ1, Δ2, and D.

3. The method for estimating the combined rotor offset parameters as described in claim 1, characterized in that: The steps for calculating the centroid offset based on the geometric parameters of the third model include: Obtain the geometric parameters L 11 L 21 L 12 L 22 , Δ1, Δ2, D, where L 11 L is the distance between the center of gravity of the first rotor on the first axis and the non-intersecting ends. 12 L is the distance between the center of gravity of the first rotor on the first axis and the intersecting end. 21 L is the distance between the center of gravity of the second rotor on the second axis and the intersecting end. 22 Δ1 is the distance between the center of gravity of the second rotor on the second axis and the non-intersecting end, Δ2 is the axial distance between the two ends of the first straight line relative to the first axis, and D is the axial distance between the two ends of the second straight line relative to the second axis. The deflection angle α of the first rotor and the deflection angle β of the second rotor, along with the geometric parameter L, are obtained through the geometric relationship of the third model. 11 L 21 L 12 L 22 The relationship between Δ1, Δ2, and D.

4. The method for estimating the combined rotor offset parameters as described in claim 3, characterized in that: The deflection angle α of the first rotor and the deflection angle β of the second rotor, along with the geometric parameter L, are obtained through the geometric relationship of the third model. 11 L 21 L 12 L 22 The steps to establish the relationship between Δ1, Δ2, and D also include: Introduce intermediate parameters H and K, where H is the distance between the overlapping ends of the first and second axes and the combined rotor axis, and K is the distance between the non-intersecting ends of the second axis and the first axis. Establish H and L 11 L 12 The geometric relationship between H and α, and H and L 21 L 22 Geometric relationship between K and β; K and L 21 L 22 The geometric relationships between Δ1, Δ2, and D, and the relationships between H and K and L. 11 L 21 L 12 L 22 The geometric relationship between them α and β, along with the geometric parameter L, are obtained by simultaneously solving H and K. 11 L 21 L 12 L 22 The relationship between Δ1, Δ2, and D.

5. The method for estimating the combined rotor offset parameters as described in claim 1, characterized in that: The steps for establishing the third model include: The first and second straight lines are joined together, and the endpoints where the first axis intersects the first straight line and the second axis intersects the second straight line are aligned.

6. The method for estimating the combined rotor offset parameters as described in claim 1, characterized in that: The third model includes a third axis, which is the line connecting the non-intersecting ends of the first axis and the second axis, and the third axis is used to characterize the axis of the combined rotor.

7. The method for estimating the combined rotor offset parameters as described in claim 1, characterized in that: The first straight line is the center line of the first rotor mating surface with the largest axial distance between its two ends, and the second straight line is the center line of the second rotor mating surface with the largest axial distance between its two ends.

8. A rotor assembly method, characterized in that: The rotor's center of gravity offset and deflection angle are estimated using the estimation method of combined rotor offset parameters as described in any one of claims 1 to 7.

9. A rotor, characterized in that: It is manufactured using the rotor assembly method as described in claim 8.

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