Moment of weight equivalent conversion method and moment of weight measurement error determination method

Abstract

The application discloses a weight moment equivalent conversion method and a weight moment measurement error determination method. The weight moment equivalent conversion method comprises the following steps: S10, acquiring the weight moment of an original turbine blade measured by a first measuring device; S20, measuring the weight moment of the original turbine blade by a second measuring device; S30, measuring the weight moment of a repaired turbine blade by the second measuring device; S40, acquiring the weight of the original turbine blade; S50, acquiring the weight of the repaired turbine blade; S60, obtaining the weight moment of the repaired turbine blade on the first measuring device by using a formula. The application establishes a turbine blade weight moment equivalent conversion model, can be used for the equivalent conversion of the weight moment of a fan blade under the conditions of using different weight moment measuring devices and different weight moment measuring tools, and eliminates the generated system error; in the case that only a small amount of fan blades are measured, the weight moment optimization sorting of the original turbine blade and the repaired turbine blade or a newly replaced blade can be completed.

Description

Technical Field

[0001] This invention relates to the field of aero-engine assembly, and in particular to a method for equivalent conversion of moment of mass and a method for determining the measurement error of moment of mass. Background Technology

[0002] High-bypass turbofan engines operate in harsh environments for extended periods, and engine parts generally require maintenance after a certain period of use. Some components, such as fan blades, are particularly vulnerable due to their location within the engine and may require even shorter maintenance cycles. Located at the engine inlet, fan blades are highly susceptible to impacts from birds, rocks, and other debris, as well as corrosion and erosion from windblown sand, atmospheric gases, and liquids, leading to surface damage. Damage to the blade surface reduces aerodynamic performance, resulting in a loss of engine thrust. It can also cause imbalances in the fan blades, increasing engine vibration levels and potentially exceeding limits. Furthermore, fan blades provide nearly 80% of the thrust of high-bypass turbofan engines, and their tenon joints experience significant loads and are prone to wear. Therefore, fan blades require maintenance more frequently.

[0003] After fan blade repair, the weight moment of each blade must be remeasured and optimized along with other original blades to minimize the combined imbalance and prevent engine vibration. However, the weight moment measurement equipment and tooling used by fan blade repair shops are often not identical to those used by the original blade manufacturer. This difference in tooling leads to systematic errors in the weight moment measurements of the repaired blades, negatively impacting the effectiveness of weight moment optimization. Furthermore, if only a small number of blades require repair, cost considerations dictate that only these blades are removed and sent to the repair shop, while other healthy blades remain installed. The repair shop cannot remeasure the weight moment of all blades using the same tooling, making it impossible to avoid systematic measurement errors.

[0004] The current solutions are either to send the fan blades back to the original blade manufacturer to measure the weight torque, or to disassemble the entire fan blade assembly of the engine and remeasure the weight torque. Both methods inevitably lead to increased workload and higher manufacturing costs. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defects of systematic error in the measurement of the weight moment of fan blades in the prior art, which leads to large measurement workload and high manufacturing cost, and to provide an equivalent conversion method for weight moment and a method for determining the measurement error of weight moment.

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

[0007] A method for equivalent conversion of weight moments is provided for converting the weight moments of fan blades on different measuring devices. The method includes the following steps:

[0008] S10. Obtain the weight moment of the original blade measured on the first measuring device;

[0009] S20. Measure the moment of mass of the original stage blade on the second measuring device;

[0010] S30. Measure the weight moment of the maintenance blade on the second measuring device;

[0011] S40. Obtain the weight of the original stage blade;

[0012] S50, Obtain the weight of the repaired blade;

[0013] S60. The weight moment of the maintenance blade on the first measuring device is obtained using the following formula:

[0014]

[0015] Among them, M 1A M is the weight moment of the original blade measured on the first measuring device; 1B m1 is the weight moment of the original blade measured on the second measuring device; m1 is the weight of the original blade; m i The weight of the blades for maintenance; M iB For the maintenance blade's weight moment in the second measuring device; M iA The weight moment of the maintenance blade in the first measuring device;

[0016] The original blade is any one of the fan blades that has not been repaired or replaced.

[0017] In this solution, by measuring the moment of mass of the original blades and the blades under repair on the second measuring device, measuring the weight of the original blades and the blades under repair, and referring to the moment of mass of the original blades, the moment of mass of the blades under repair can be equivalently converted to the moment of mass of the blades under repair using Formula 1. This eliminates the need to transport the blades under repair to the first measuring device for measurement, avoiding increased transportation costs and improving maintenance efficiency. This invention establishes an equivalent conversion model for blade moment of mass, which can be used to equivalently convert the moment of mass of fan blades under different moment of mass measurement equipment and different moment of mass measurement fixtures, eliminating the resulting systematic errors. Even when only a small number of fan blades are measured, the optimal sorting of the moment of mass of the original blades and the blades under repair or newly replaced blades can be completed, reducing manufacturing costs and shortening the maintenance cycle.

[0018] Preferably, the first measuring device is located at the manufacturing location of the repair blade and the original blade; the second measuring device is located at the repair location of the repair blade.

[0019] This solution resolves the systematic error in the measured moment weight of the repaired blades caused by differences in the tooling used by the original blade manufacturer and the repair shop. It eliminates the need to transport the repaired blades to the original blade manufacturer for measurement, thus avoiding increased transportation costs and improving repair efficiency.

[0020] Preferably, the fan blades include a plurality of maintenance blades, and the weight moment equivalent conversion method further includes the following steps:

[0021] S70. Steps S30, S50 and S60 are performed on all of the multiple repair blades to obtain the weight moment of the multiple repair blades in the first measuring device.

[0022] Preferably, the fan blades include at least one maintenance blade and at least one original blade, and after step S60, the following step is further included:

[0023] S80. Obtain the weight moment of all the maintenance blades of the fan blade in the first measuring device;

[0024] S90. Perform weight moment optimization sorting on all the original blades and all the maintenance blades of the fan blades.

[0025] Preferably, before step S30, the following step is further included:

[0026] S21. Repair the blade being repaired;

[0027] Step S21 is performed simultaneously with either step S20 or step S10.

[0028] In this solution, the maintenance process and the process of obtaining or measuring the original blade weight moment do not interfere with each other. Performing them simultaneously can save measurement time and improve maintenance efficiency.

[0029] A method for determining the measurement error of moment of weight, used to determine the measurement error of moment of weight of fan blades under different measuring devices, the method comprising the following steps:

[0030] S1. Obtain the weight moment of the original blade measured by the first measuring device;

[0031] S2. Measure the weight moment of the original stage blade on the second measuring device;

[0032] S3. Measure the weight moment of the maintenance blade on the second measuring device;

[0033] S4. Obtain the weight of the original blade and the repaired blade;

[0034] S5. The measurement error of the weight moment of the maintenance blade in the first measuring device and the second measuring device is obtained using the following formula:

[0035]

[0036] Among them, M 1A M is the moment of mass measured by the first measuring device for the original blade. 1B m1 is the weight moment of the original blade measured by the second measuring device; m1 is the weight of the original blade; m i M is the weight of the blade being repaired; iAB The measurement error of the moment of weight of the repair blade in the first measuring device and the second measuring device;

[0037] The original blade is any one of the fan blades that has not been repaired or replaced.

[0038] In this scheme, the systematic error of the blade weight moment measured by the first measuring device and the second measuring device can be obtained through Formula 2 above. The first measuring device and the second measuring device can correspond to different manufacturers, thereby facilitating the elimination of systematic errors in the measurement of blade weight moment by different manufacturers.

[0039] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0040] The positive and progressive effects of this invention are as follows:

[0041] By measuring the moment of mass of the original blades and the blades under repair on the second measuring device, measuring the weight of the original blades and the blades under repair, and referring to the moment of mass of the original blades, the moment of mass of the blades under repair can be equivalently converted to the moment of mass of mass of the blades using the first measuring device by substituting it into Formula 1. This eliminates the need to transport the blades under repair to the first measuring device for measurement, avoiding increased transportation costs and improving maintenance efficiency. This invention establishes an equivalent conversion model for blade moment of mass, which can be used to equivalently convert the moment of mass of fan blades under different moment of mass measurement equipment and different moment of mass measurement fixtures, eliminating the resulting systematic errors. When only a small number of fan blades are measured, the weight moments of the original blades and the blades under repair or newly replaced blades can be optimized and sorted, reducing manufacturing costs and shortening the maintenance cycle. Attached Figure Description

[0042] Figure 1 This is a flowchart of a weight moment equivalent conversion method according to a preferred embodiment of the present invention.

[0043] Figure 2 This is another flowchart of the weight moment equivalent conversion method according to a preferred embodiment of the present invention.

[0044] Figure 3 This is a schematic diagram of the weight moment measurement parameters according to a preferred embodiment of the present invention.

[0045] Figure 4 This is a schematic diagram of the original blade and the maintenance blade according to a preferred embodiment of the present invention.

[0046] Explanation of reference numerals in the attached figures:

[0047] Original blade 1

[0048] Repair blade 2

[0049] Center of mass 3

[0050] Mounting surface 4

[0051] Rotation axis 5

[0052] Installation radius R

[0053] First distance S Detailed Implementation

[0054] 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.

[0055] Example 1

[0056] This embodiment provides a method for equivalent conversion of weight moments, used to equivalently convert the weight moments of fan blades under different measuring devices. For example... Figure 1-4 As shown, the equivalent transformation method for weight moment includes the following steps:

[0057] S10. Obtain the weight moment of the original blade 1 measured on the first measuring device;

[0058] S20. Measure the moment of mass of the original stage blade 1 on the second measuring device;

[0059] S30. Measure the weight moment of the maintenance blade 2 on the second measuring device;

[0060] S40. Obtain the weight of the original blade 1;

[0061] S50, Obtain the weight of the maintenance blade 2;

[0062] S60. The weight moment of the maintenance blade 2 on the first measuring device is obtained using the following formula:

[0063]

[0064] Among them, M1A M is the moment of mass measured by the original blade 1 on the first measuring device; 1B m1 is the mass moment of the original blade 1 measured on the second measuring device; m1 is the weight of the original blade 1; m i The weight of blade 2 for maintenance; M iB For the maintenance of blade 2, the weight moment of the second measuring device; M iA The weight moment of the blade 2 in the first measuring device is used for maintenance; wherein, the original blade 1 is any one of the fan blades that has not been maintained or replaced.

[0065] In this embodiment, by measuring the moment of mass of the original blade 1 and the repair blade 2 on the second measuring device, measuring the weight of the original blade 1 and the repair blade 2, and referring to the moment of mass of the original blade 1, the repair blade 2 can be equivalently converted to the moment of mass using the first measuring device by substituting it into Formula 1. This eliminates the need to transport the repair blade 2 to the first measuring device for measurement, avoiding increased transportation costs and improving maintenance efficiency. This invention establishes an equivalent conversion model for blade moment of mass, which can be used to equivalently convert the moment of mass of fan blades under different moment of mass measurement equipment and different moment of mass measurement fixtures, eliminating the resulting systematic errors. Even when only a small number of fan blades are measured, it can optimize the ranking of the moment of mass of the original blade 1 and the repair blade 2 or newly replaced blades, reducing manufacturing costs and shortening the maintenance cycle.

[0066] It should be noted that in this embodiment, "repaired blade 2" refers to a blade that has been repaired, or it can refer to a newly replaced blade. "Original blade 1" refers to any one of the fan blades that has not been repaired or replaced. The weight moment in this embodiment is the absolute weight moment.

[0067] In step S10, the weight moment of the original blade 1 measured on the first measuring device can be obtained by consulting the reference, without having to transport the original blade 1 to the first measuring device.

[0068] In this embodiment, the first measuring device is located at the manufacturing locations of both the repair blade 2 and the original blade 1, for example, manufacturing plant A; the second measuring device is located at the repair location of the repair blade 2, for example, repair plant B. This solves the problem of systematic errors in the absolute moment of weight measurement values ​​of the repair blade 2 and the original blade 1 due to differences in the blade moment of weight measurement tooling used by the original blade 1's manufacturing plant A and the repair blade 2's repair plant B. It also eliminates the need to transport the repair blade 2 to the original blade 1's manufacturing plant for measurement, avoiding increased transportation costs and improving repair efficiency.

[0069] The derivation of Formula 1 above is as follows:

[0070] like Figure 3As shown, S represents the distance from the blade's centroid 3 to the blade's mounting surface 4, which is the first distance S, in mm. R represents the distance from the blade's mounting surface 4 to the rotation axis 5 of the engine rotor where the blade is located, as shown below. Figure 3 The installation radius R is in mm. m represents the blade weight in g. M represents the blade radial absolute weight moment in g·mm.

[0071] 1) The absolute mass moment of the i-th blade is measured as M at manufacturing plant A (which has the first measuring device in this embodiment). iA It can be known that

[0072] M iA =m i (R A +S i Formula 3

[0073] Among them, R A This represents the blade installation radius simulated by the measuring fixture used in manufacturing plant A.

[0074] 2) The absolute moment of mass of the i-th blade was measured at the B maintenance workshop and was M. iB It can be known that

[0075] M iB =m i (R B +S i Formula 4

[0076] Among them, R B This represents the blade mounting radius simulated by the measuring fixture used at maintenance workshop B (which has the second measuring device in this embodiment). Generally, R... B ≠R A .

[0077] 3) By subtracting Formula 3 from Formula 4, we can obtain...

[0078] M iB -M iA =m i (R B -R A Formula 5

[0079] 4) If the absolute weight moment of blade #1 (which can be any original blade #1) is known to be M when measured at manufacturing plant A. 1A According to Formula 5,

[0080] M 1B -M 1A =m1(R B -R A Formula Six

[0081] Among them, M1B m1 and m2 are the absolute moment of mass and weight of the original blade 1, respectively, measured at the B maintenance plant.

[0082] Meanwhile, at the B repair shop, the absolute moment of mass M of all repaired blades 2 can be measured. iB and weight m i Substituting Formula 6 into Formula 5, we can obtain the absolute weight moment of the blade after repair, equivalent to that under the conditions of using the measuring equipment and tooling of Manufacturing Plant A:

[0083] Thus, Formula 1 in this embodiment is obtained.

[0084] In this embodiment, the fan blades include multiple maintenance blades 2, and the weight moment equivalent conversion method further includes the following steps:

[0085] S70. Steps S30, S50 and S60 are performed on all the multiple maintenance blades 2 to obtain the weight moment of the multiple maintenance blades 2 in the first measuring device.

[0086] In this embodiment, the fan blades include at least one maintenance blade 2 and at least one original blade 1. After step S60, the following steps are also included:

[0087] S80, obtain the weight moment of all maintenance blades 2 of the fan blades on the first measuring device;

[0088] S90. Perform weight moment optimization sorting on all original blades 1 and all maintenance blades 2 of the fan blades.

[0089] In this embodiment, before step S30, the following steps are also included:

[0090] S21. Repair blade 2;

[0091] In this process, step S21 is performed simultaneously with either step S20 or step S10. The maintenance process and the process of acquiring or measuring the weight moment of the original blade 1 do not interfere with each other, and performing them simultaneously can save measurement time and improve maintenance efficiency.

[0092] Taking a certain aero-engine fan blade as an example, such as Figure 2 As shown, the specific steps for the equivalent transformation of the absolute weight moment of the blade are as follows: (Other rotor blades can be deduced similarly)

[0093] (1) Check and record the absolute moment of mass M of the original blade 1 (any one, such as 1#). 1A (Measurements from Factory A);

[0094] (2) The weight m1 and absolute moment of mass M of the original blade 1 (1#) were measured at the B repair shop. 1B;

[0095] (3) Perform repairs on the other blades 2 that need repair;

[0096] (4) The weight m of the 2i# blade being repaired was measured at the B repair shop. i and absolute weight moment M iB ;

[0097] (5) Calculate the equivalent absolute moment of mass M of the maintenance blade 2i# according to Formula 1. iA ;

[0098] (6) Optimize the weight moment sorting of the original blade 1 and the repaired blade 2.

[0099] Example 2

[0100] This embodiment also discloses a method for determining the measurement error of the moment of weight, used to determine the measurement error of the moment of weight of fan blades under different measuring devices. The method includes the following steps:

[0101] S1. Obtain the weight moment of the original blade 1 measured by the first measuring device;

[0102] S2. Measure the moment of mass of the original blade 1 on the second measuring device;

[0103] S3. Measure the weight moment of the maintenance blade 2 on the second measuring device;

[0104] S4. Obtain the weights of the original blade 1 and the repair blade 2;

[0105] S5. The measurement error of the weight moment of the maintenance blade 2 in the first and second measuring devices is obtained using the following formula:

[0106]

[0107] Among them, M 1A M is the moment of mass measured by the first measuring device for blade 1 of the original stage; 1B m1 is the mass moment of the original blade 1 measured by the second measuring device; m1 is the weight of the original blade 1; m i The weight of blade 2 for maintenance; M iAB To repair the error in the weight moment measurement between the first and second measuring devices for blade 2;

[0108] Wherein, blade 1 is any one of the fan blades that has not been repaired or replaced. Based on Formula 1, M... iA Subtract M iB The obtained value is the systematic error of the blade weight moment measured by the first and second measuring devices, thus yielding Formula 2.

[0109] In this embodiment, the systematic error of the blade weight moment measured by the first measuring device and the second measuring device can be obtained through the above formula 2. The first measuring device and the second measuring device can correspond to different manufacturers, thereby facilitating the elimination of systematic errors in the measurement of blade weight moment by different manufacturers.

[0110] 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 equivalent conversion of weight moments, used to equivalently convert the weight moments of fan blades in different measuring devices, characterized in that, The equivalent conversion method for weight moment includes the following steps: S10. Obtain the weight moment of the original blade measured on the first measuring device; S20. Measure the moment of mass of the original stage blade on the second measuring device; S30. Measure the weight moment of the maintenance blade on the second measuring device; S40. Obtain the weight of the original stage blade; S50, Obtain the weight of the repaired blade; S60. The weight moment of the maintenance blade on the first measuring device is obtained using the following formula: Among them, M 1A M is the weight moment of the original blade measured on the first measuring device; 1B m1 is the weight moment of the original blade measured on the second measuring device; m1 is the weight of the original blade; m i The weight of the blades for maintenance; M iB For the maintenance blade's weight moment in the second measuring device; M iA The weight moment of the maintenance blade in the first measuring device; The original blade is any one of the fan blades that has not been repaired or replaced.

2. The weight moment equivalent conversion method as described in claim 1, characterized in that, The first measuring device is located at the manufacturing location of the repair blade and the original blade; the second measuring device is located at the repair location of the repair blade.

3. The weight moment equivalent conversion method as described in claim 1, characterized in that, The fan blades include a plurality of maintenance blades, and the weight moment equivalent conversion method further includes the following steps: S70. Steps S30, S50 and S60 are performed on all of the multiple repair blades to obtain the weight moment of the multiple repair blades in the first measuring device.

4. The weight moment equivalent conversion method as described in claim 1, characterized in that, The fan blades include at least one maintenance blade and at least one original blade. After step S60, the following steps are also included: S80. Obtain the weight moment of all the maintenance blades of the fan blade in the first measuring device; S90. Perform weight moment optimization sorting on all the original blades and all the maintenance blades of the fan blades.

5. The weight moment equivalent conversion method as described in claim 1, characterized in that, Before step S30, the following steps are also included: S21. Repair the blade being repaired; Step S21 is performed simultaneously with either step S20 or step S10.

6. A method for determining the measurement error of moment weight, used to determine the measurement error of moment weight of fan blades under different measuring devices, characterized in that, The method includes the following steps: S1. Obtain the weight moment of the original blade measured by the first measuring device; S2. Measure the weight moment of the original stage blade on the second measuring device; S3. Measure the weight moment of the maintenance blade on the second measuring device; S4. Obtain the weight of the original blade and the repaired blade; S5. The measurement error of the weight moment of the maintenance blade in the first measuring device and the second measuring device is obtained using the following formula: Among them, M 1A M is the moment of mass measured by the first measuring device for the original blade. 1B m1 is the weight moment of the original blade measured by the second measuring device; m1 is the weight of the original blade; m i M is the weight of the blade being repaired; iAB The measurement error of the moment of weight of the repair blade in the first measuring device and the second measuring device; The original blade is any one of the fan blades that has not been repaired or replaced.

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