A method for measuring the in-situ relationship of a blade disc structure connecting interface

Abstract

The application discloses a kind of blade disc structure connecting interface in-situ relationship measurement method, mainly including electric cylinder driving system, support frame, blade, displacement measuring interferometer and data processing system;Electric cylinder driving system is composed of high-precision straight electric cylinder, force sensor and elastic rope etc., according to actual situation, the installation quantity of electric cylinder system is adjusted, position, to ensure that when restoring real working condition connecting interface contact state, as far as possible adapt to the complex measurement needs of different blade shapes, whether with blade crown / shoulder etc.;Displacement measuring interferometer is used to obtain the displacement value of multiple calibration points at blade root end at nanometer level precision, and the translation and torsion angle of blade root are calculated accordingly, finally the in-situ relationship of blade disc connecting interface is obtained by combining force sensor and the motion amount of blade root.The application can simulate the complex contact state of connecting interface under real working condition of blade disc structure in static environment, and can provide more real situation boundary conditions for vibration test etc..

Description

Technical Field

[0001] This invention relates to the field of mechanical measurement technology for engine bladed disk structures, and more specifically, to a method for measuring the in-situ relationship of the connection interface of a bladed disk structure. Background Technology

[0002] Engine bladed disk structures (such as those in aero engines and gas turbines) typically contain numerous connection interfaces (such as tenons / mortises, ribs / dampers, shoulders / shoulders, and blade crowns / blades). The contact characteristics of these interfaces significantly influence the overall dynamic characteristics of the engine, severely limiting performance improvements. To obtain the contact characteristics of these bladed disk structure connection interfaces, it is necessary to accurately measure their in-situ relationships.

[0003] Because the connection interfaces of bladed disk structures are typically geometrically complex and possess opaque physical properties, existing rough-plane contact mechanics measurement methods, such as optical, ultrasonic, and electrical methods, are unsuitable and struggle to obtain in-situ relationships at the bladed disk connection interfaces. Furthermore, most existing static vibration measurement methods for single-sector bladed disks apply loads by simply pressing or pulling from the blade base or tip. However, during actual bladed disk operation, the blade root often experiences both displacement and torsional motion simultaneously. This results in a significant discrepancy between the contact state at the blade root tenon / groove in existing measurement methods and the actual operating conditions. Consequently, subsequent modal frequencies and vibration response characteristics deviate considerably from the actual operating conditions. Therefore, most existing measurement methods are insufficient to meet the requirements for in-situ measurement of bladed disk connection interfaces under real-world operating conditions.

[0004] In summary, there is an urgent need for a measurement method that can meet the above requirements for the in-situ relationship of the bladed disk structure connection interface, and can be used to measure the in-situ relationship of the engine bladed disk structure connection interface. Summary of the Invention

[0005] The purpose of this invention is to provide a method for measuring the in-situ relationship of the bladed disk structure connection interface, so as to solve the problem that existing methods cannot accurately measure the in-situ relationship of the bladed disk structure connection interface under real working conditions, and is applicable to the needs of measuring the in-situ relationship of the engine bladed disk structure connection interface.

[0006] To achieve the above objectives, the present invention provides a method for measuring the in-situ relationship of the connection interface of a bladed disk structure, the specific steps of which are as follows:

[0007] S1. Fix the single-sector bladed disk structure disk sector on the test bench base, and complete the installation of the blades and disk. Then, connect the power supply and signal lines of the sensor in sequence.

[0008] S2. Set up elastic ropes around the blade to be tested, and at the same time provide load to the blade;

[0009] S3. Connect the other end of the elastic rope to the electric cylinder to simulate the actual motion process;

[0010] S4. Adjust the tension of each elastic rope by adjusting the electric cylinder in sequence, and record the tension of the electric cylinder in real time. At the same time, obtain the displacement value at the calibration point of the blade root end face to be measured by the displacement measurement interferometer.

[0011] S5. Read the pulling force values ​​of the eight electric cylinders respectively, and calculate them in combination with the displacement values ​​at the calibration points of the blade root end face to be measured, and then convert them to obtain the in-situ relationship of the connection interface.

[0012] Preferably, step S2 further includes step S21, which is as follows:

[0013] S21. Two, one, and two elastic ropes are symmetrically fixed on both sides of the blade root, front and back, and top of the blade, respectively, to provide loads for the blade in three translational and three rotational directions.

[0014] Preferably, step S4 further includes step S41, which is as follows:

[0015] S41. The number of calibration points is three.

[0016] Preferably, step S5 further includes step S51, which is as follows:

[0017] S51. Read the pulling force values ​​of the eight electric cylinders respectively, and calculate the overall displacement and torsion angle of the blade root based on the displacement values ​​of the three calibration points on the end face to be measured of the blade root.

[0018] The present invention also provides a testing system for the connection interface of the bladed disk structure, including

[0019] Electric cylinder drive system, wheel sector base, support frame, blades, displacement measurement interferometer, and data processing system;

[0020] The electric cylinder drive system includes eight electric cylinder drive systems located on both sides, both ends and the tip of the blade. The electric cylinder drive system mainly includes a high-precision straight electric cylinder, a force sensor connected to the electric cylinder, and an elastic rope connected to the sensor. The support frame mainly includes two layers: the lower layer is used to fix six electric cylinder systems around the blade root, and the upper layer is used to fix two electric cylinder systems at the tip of the blade.

[0021] The present invention also provides a computer device, the computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the program to implement the steps of the above method.

[0022] The present invention also provides a computer-readable storage medium having a computer program stored thereon, characterized in that: when the program is executed by a processor, it implements the steps of the above method.

[0023] Compared with existing technologies, the technical solution proposed in this application has the following advantages: it can approximate the operating conditions of a rotating full-cycle bladed disk using static single-sector bladed disk conditions. Most existing static single-sector bladed disk tests only involve bottom clamping or top tensile loading, failing to simulate the combined tensile and torsional motion of a real bladed disk, thus resulting in significant differences from actual conditions and unreliable test results. This invention utilizes eight elastic ropes to highly replicate the contact state of the bladed disk structure connection interface under real operating conditions, making it more practical for engineering applications.

[0024] The blades' translational and rotational degrees of freedom are controlled by a composite of eight elastic ropes, which theoretically can reproduce the contact state of the blade disk connection interface under any working condition. Attached Figure Description

[0025] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the measurement method for the in-situ relationship of the connection interface of the bladed disk structure according to the present invention;

[0027] Figure 2 For the present invention Figure 1 A partial schematic diagram;

[0028] Figure 3 This is a schematic diagram showing the installation location of the elastic rope;

[0029] Figure 4 This is a schematic diagram of the blade structure. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described and discussed below with reference to the accompanying drawings. Obviously, what is described here is only a part of the examples of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0031] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] This invention provides a method for measuring the in-situ relationship of the connection interface of an impeller structure, the specific steps of which are as follows:

[0034] S1. Fix the single-sector bladed disk structure disk sector on the test bench base, and complete the installation of the blades and disk. Then, connect the power supply and signal lines of the sensor in sequence.

[0035] S2. Set up elastic ropes around the blade to be tested, and at the same time provide load to the blade;

[0036] S3. Connect the other end of the elastic rope to the electric cylinder to simulate the actual motion process;

[0037] S4. Adjust the tension of each elastic rope by adjusting the electric cylinder in sequence, and record the tension of the electric cylinder in real time. At the same time, obtain the displacement value at the calibration point of the blade root end face to be measured by the displacement measurement interferometer.

[0038] S5. Read the pulling force values ​​of the eight electric cylinders respectively, and calculate them in combination with the displacement values ​​at the calibration points of the blade root end face to be measured, and then convert them to obtain the in-situ relationship of the connection interface.

[0039] Step S2 further includes step S21, which is as follows:

[0040] S21. Two, one, and two elastic ropes are symmetrically fixed on both sides of the blade root, front and back, and top of the blade, respectively, to provide loads for the blade in three translational and three rotational directions.

[0041] Step S4 further includes step S41, which is as follows:

[0042] S41. The number of calibration points is three.

[0043] Step S5 further includes step S51, which is as follows:

[0044] S51. Read the pulling force values ​​of the eight electric cylinders respectively, and calculate the overall displacement and torsion angle of the blade root based on the displacement values ​​of the three calibration points on the end face to be measured of the blade root.

[0045] The present invention also provides a testing system for the connection interface of the bladed disk structure, including

[0046] Electric cylinder drive system, wheel sector base, support frame, blades, displacement measurement interferometer, and data processing system;

[0047] The electric cylinder drive system includes eight electric cylinder drive systems located on both sides, both ends and the tip of the blade. The electric cylinder drive system mainly includes a high-precision straight electric cylinder, a force sensor connected to the electric cylinder, and an elastic rope connected to the sensor. The support frame mainly includes two layers: the lower layer is used to fix six electric cylinder systems around the blade root, and the upper layer is used to fix two electric cylinder systems at the tip of the blade.

[0048] For details, see Figures 1 to 4 The test system includes a test base 1, a wheel sector base 2, a support frame 3, a blade 7, a displacement measuring interferometer 13, and electric cylinder systems 4-6 and 8-12. The test base 1 is mainly used to fix the wheel sector base 2, the support frame 3, and the displacement measuring interferometer 13. The support frame 3 is mainly used to fix the eight electric cylinders and provide them with force application support points. The eight electric cylinder systems are distributed around the blade and at the tip. Two are symmetrically distributed on each side of the blade, namely electric cylinder systems 4 and 5 and electric cylinder systems 10 and 11, which together constitute the lateral displacement and torsional motion of the blade along the vertical central axis. One is installed at each end of the blade, namely electric cylinder systems 6 and 12, which together control the axial displacement of the blade. Two are installed at the tip of the blade, namely electric cylinder systems 8 and 9, which together control the radial motion and torsional motion of the blade along the circumferential direction. The electric cylinder system mainly includes a high-precision linear electric cylinder (e.g., 801), a force sensor (e.g., 802), and an elastic rope (e.g., 803). The force sensor is mainly used to acquire the load applied to the blade by the drive lever in real time. The wheel disk sector base 2 is mainly used to provide a corresponding tenon-groove connection interface for the tenon connection interface 703 in the blade 7. The displacement measurement interferometer 13 is mainly used to acquire the displacement values ​​at the calibration points 7021, 7022, and 7023 on the blade root test interface 702, so as to further calculate the three displacements and three torsion angles of the blade root. The blade 7 can be any blade with a connecting interface blade disk structure.

[0049] The basic principle of the calculation method is as follows:

[0050] 1. The tensions measured for electric cylinder systems 6, 12, 5, 11, 4, 10, 8, and 9 are f1-f8, respectively; the distances between electric cylinder systems 4 and 5, 10 and 11, 8 and 9 and the blade root connection points are all L; assuming... Figure 4 The displacements along the x, y, and z axes at the root of the middle leaf are x1, x2, and x3, respectively, and the rotation angles are α1, α2, and α3, respectively.

[0051] 2. The loads on the blade root along the x, y, and z axes can then be calculated as follows: F1 = f1 - f2; F2 = f3 + f5 - f4 - f6; F3 = f7 + f8. Based on the force state at the blade root, assuming the torque and torsion angle around the x-axis are M1 = 0 and α1 = 0, the torques along the y and z axes are measured as M2 = f7 * L and M3 = (f5 - f6) * L, respectively.

[0052] 3. The spatial positions of three calibration points at the leaf root are obtained using an optical interferometer combined with a 6DOF pose estimation algorithm for image recognition. Assuming calibration point 7021 is the rotation center, the spatial translations of this point are x1, x2, and x3, respectively. The rotation angle of calibration point 7023 about calibration point 7021 in the xoz plane is α2, and the rotation angle of calibration point 7022 about calibration point 7021 in the xoy plane is α3.

[0053] 4. The translational stiffness at the leaf root is kx = F1 / x1, ky = F2 / x2, kz = F3 / x3; the rotational stiffness is km1 = ∞, km2 = M2 / α2, km3 = M3 / α3.

[0054] When using the method of this invention, one can consider first driving the electric cylinder systems 8 and 9 upwards to simulate the centrifugal load during blade rotation, and then finely adjusting the displacement of each electric cylinder to achieve various complex contact states that conform to the actual working conditions of the bladed disk. In actual operation, the displacement of the electric cylinders is adjusted based on experimental feedback, and the values ​​of each sensor and the displacement of the calibration point are recorded in real time. When using the measurement method of this application, a suitable installation position and angle of the elastic rope are selected as needed, and the stroke of the electric cylinders is gradually adjusted according to the actual movement state of the blade. It is worth noting that the example given in this invention only includes an eight-cylinder drive system, but to simulate more complex blade movements, more complex electric cylinders or other force drive combinations can be used in practice.

[0055] Through a detailed analysis of the above measurement methods, it is easy to conclude that this application has the following advantages:

[0056] It can utilize the stroke combination of electric cylinders to obtain complex blade motion states, and achieves a contact state of the blade disk structure connection interface that is closer to the real working conditions than the existing drive method that simply relies on bottom clamping or top stretching.

[0057] The displacement measurement interferometer can obtain nanometer-level blade root motion accuracy, and then the high-precision blade root displacement and torsion angle can be calculated by using the three-point positioning principle. Therefore, the in-situ relationship obtained in this application is the in-situ relationship of the real blade disk tenon / mortise connection interface, rather than the simplified in-situ relationship of the rough sample in the traditional sense, which is more of a practical engineering significance.

[0058] When the electric cylinder combination is appropriately increased, this application can also be used for in-situ measurement of disks with crown blades and disks with convex shoulders, and provide a real contact state for further accurate measurement of modal frequencies and vibration response.

[0059] This embodiment also provides a computer device, such as a smartphone, tablet computer, laptop computer, desktop computer, rack server, blade server, tower server, or cabinet server (including standalone servers or server clusters composed of multiple servers) capable of executing programs. The computer device in this embodiment includes, but is not limited to, a memory and a processor that can be interconnected via a system bus.

[0060] In this embodiment, the memory (i.e., the readable storage medium) includes flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, disk, optical disk, etc. In some embodiments, the memory can be an internal storage unit of a computer device, such as the hard disk or RAM of the computer device. In other embodiments, the memory can also be an external storage device of the computer device, such as a plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, etc. Of course, the memory can also include both internal storage units and external storage devices of the computer device. In this embodiment, the memory is typically used to store the operating system and various application software installed on the computer device. Furthermore, the memory can also be used to temporarily store various types of data that have been output or will be output.

[0061] In some embodiments, the processor may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other data processing chip. The processor 22 is typically used to control the overall operation of a computer device. In this embodiment, the processor is used to run program code stored in memory or process data.

[0062] This embodiment also provides a computer-readable storage medium, such as flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, disk, optical disk, server, App application store, etc., which stores computer programs, and the programs perform corresponding functions when executed by a processor.

[0063] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, nor to combinations thereof. Those skilled in the art can make various changes, modifications, or combinations within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method of measuring the in-situ relationship of a blisk structure connection interface, characterized by, The specific steps are as follows: S1. Fix the single-sector bladed disk structure disk sector on the test bench base, and complete the installation of the blades and disk. Then, connect the power supply and signal lines of the sensor in sequence. S2. Set up elastic ropes around the blade to be tested, and at the same time provide load to the blade; S3. Connect the other end of the elastic rope to the electric cylinder to simulate the actual motion process; S4. Adjust the tension of each elastic rope by adjusting the electric cylinder in sequence, and record the tension of the electric cylinder in real time. At the same time, obtain the displacement value at the calibration point of the blade root end face to be measured by the displacement measurement interferometer. S5. Read the pulling force values ​​of the eight electric cylinders respectively, and calculate them in combination with the displacement values ​​at the calibration points of the blade root end face to be measured, and then convert them to obtain the in-situ relationship of the connection interface.

2. The method of claim 1, wherein: Step S2 further includes step S21, which is as follows: S21. Two, one, and two elastic ropes are symmetrically fixed on both sides of the blade root, front and back, and top of the blade, respectively, to provide loads for the blade in three translational and three rotational directions.

3. The method of claim 1, wherein: Step S4 further includes step S41, which is as follows: S41. The number of calibration points is three.

4. The method of claim 3, wherein: Step S5 further includes step S51, which is as follows: S51. Read the pulling force values ​​of the eight electric cylinders respectively, and calculate the overall displacement and torsion angle of the blade root based on the displacement values ​​of the three calibration points on the end face to be measured of the blade root.

5. A test system for a blisk structure attachment interface, the test system comprising: include Electric cylinder drive system, wheel sector base, support frame, blades, displacement measurement interferometer, and data processing system; The electric cylinder drive system includes eight electric cylinder drive systems located on both sides, both ends and the tip of the blade. The electric cylinder drive system mainly includes a high-precision straight electric cylinder, a force sensor connected to the electric cylinder, and an elastic rope connected to the sensor. The support frame mainly includes two layers: the lower layer is used to fix six electric cylinder systems around the blade root, and the upper layer is used to fix two electric cylinder systems at the tip of the blade.

6. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method according to any one of claims 1 to 4.

7. A computer readable storage medium having stored thereon a computer program, characterized in that: When the program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 4.

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