Engine rotor squeeze film damper oil film pressure measuring device and method

Abstract

The application discloses an engine rotor squeeze oil film damper oil film pressure measuring device, which comprises an adapter seat, a squirrel cage spring, a squeeze oil film damper and an oil pressure sensor; the adapter seat is annular, the squirrel cage spring is fixedly installed in a cavity of the adapter seat, an engine rotor shaft journal is arranged in the squirrel cage spring, and a bearing is arranged between the squirrel cage spring and the engine rotor; the squeeze oil film damper comprises a squeeze oil film outer ring, a squeeze oil film cavity and a squeeze oil film inner ring, the squeeze oil film outer ring is an inner wall of the adapter seat, the squeeze oil film inner ring is an outer wall of the squirrel cage spring, and the squeeze oil film cavity is located between the squeeze oil film outer ring and the squeeze oil film inner ring; a sensor mounting hole is formed in the adapter seat, the oil pressure sensor is mounted in the sensor mounting hole, and a sensor probe of the oil pressure sensor extends into the squeeze oil film cavity. The application has the advantages that the oil film pressure change in the squeeze oil film damper can be conveniently obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of aero-engine rotors, and in particular to an oil film pressure measuring device and method for an engine rotor squeeze film damper. Background Art

[0002] Squeeze film dampers are widely used in the rotor support systems of small and medium-sized aircraft engines. They effectively absorb vibration energy caused by residual rotor imbalance, significantly reducing rotor vibration displacement and bearing load, thereby improving engine operating stability and reliability and extending bearing life. Oil film pressure, a key performance indicator of a squeeze film damper, is closely related to the film stiffness and damping coefficients. This value is of great engineering value in validating and optimizing squeeze film damper dynamic analysis models and minimizing engine vibration.

[0003] Currently, the research methods for the oil film pressure in squeeze film dampers are generally divided into theoretical calculations or indirect tests. Theoretical calculations include numerical analysis and analytical methods, while indirect tests generally simply replace the oil film pressure in the squeeze film damper with the inlet oil pressure. Since the factors affecting the actual operation of the squeeze film damper are complex and diverse, the boundary conditions assumed in the theoretical calculations will differ significantly from the actual situation, resulting in certain errors and limitations in the theoretical analysis. There is a large difference between the inlet oil pressure and the oil film pressure inside the squeeze film damper, and during the rotor test, the oil film pressure and distribution are a dynamic process that changes with the rotational speed. Therefore, the indirect test method is not suitable for the study of oil film pressure. Summary of the Invention

[0004] The present invention provides an oil film pressure measuring device and method for an engine rotor squeeze film damper, so as to solve the problem that the oil film pressure in the squeeze film damper is difficult to obtain.

[0005] According to one aspect of the present invention, there is provided an oil film pressure measuring device for an engine rotor squeeze film damper, comprising an adapter, a squirrel cage spring, a squeeze film damper, and an oil pressure sensor;

[0006] The adapter is annular, the squirrel cage spring is fixedly installed in the cavity of the adapter, the engine rotor shaft neck is passed through the squirrel cage spring, and a bearing is provided between the squirrel cage spring and the engine rotor;

[0007] The squeeze film damper includes a squeeze film outer ring, a squeeze film cavity and a squeeze film inner ring. The squeeze film outer ring is the inner wall of the adapter, the squeeze film inner ring is the outer wall of the squirrel cage spring, and the squeeze film cavity is located between the squeeze film outer ring and the squeeze film inner ring.

[0008] A sensor mounting hole is provided on the adapter, the oil pressure sensor is mounted in the sensor mounting hole, and a sensor probe of the oil pressure sensor extends into the extruded oil film cavity.

[0009] Optionally, the adapter is provided with a sensor fixing threaded hole connected to the sensor mounting hole, and the oil pressure sensor is provided with a corresponding sensor mounting thread.

[0010] Optionally, a fastening hexagon is provided on the oil pressure sensor, and a sealing ring is sleeved on the oil pressure sensor, and the sealing ring is located between the fastening hexagon and the adapter seat.

[0011] Optionally, an expansion ring mounting groove is provided on the outer ring of the extrusion oil film along the circumferential direction, and two expansion ring mounting grooves are provided along the axial direction. An expansion ring is correspondingly installed in the expansion ring mounting groove, and the sensor probe of the oil pressure sensor is located between the two expansion ring mounting grooves.

[0012] Optionally, an extrusion oil film filling hole communicating with the extrusion oil film cavity is provided in the adapter seat, the extrusion oil film filling hole is connected to an extrusion oil film oil circuit, and an oil pipe head interface is provided at the end of the extrusion oil film oil circuit.

[0013] Optionally, a sensor lead is provided at one end of the oil pressure sensor away from the sensor probe, and a sensor lead groove is provided at the end of the sensor mounting hole of the adapter, and the position and size of the sensor lead groove match the sensor lead.

[0014] Optionally, the adapter seat has a squirrel cage spring support centering cylindrical surface and an adapter seat centering cylindrical surface structure, the spring support centering cylindrical surface is used to cooperate with the cylindrical surface of the squirrel cage spring support, and the adapter seat centering cylindrical surface is used to cooperate with the cylindrical surface of the test platform support.

[0015] Optionally, a plurality of oil pressure sensors are evenly spaced along the circumference of the adapter.

[0016] According to another aspect of the present invention, a method for measuring the oil film pressure of an engine rotor squeeze film damper is provided, comprising the following steps:

[0017] Install the oil film pressure measuring device of the engine rotor squeeze film damper with the engine rotor installed on the test platform and align it to ensure that the engine rotor and the input end of the test platform are on the same axis;

[0018] Connect the oil pressure sensor of the oil film pressure measurement device of the engine rotor squeeze film damper to each channel of the data acquisition device, adjust the platform squeeze film oil supply pressure to 0.2Mpa, 0.4Mpa, 0.6Mpa and 0.8MPa, and maintain it for 30 seconds, obtain the one-to-one corresponding oil pressure sensor measurement value, and then use the least squares method to fit the oil pressure sensor measurement value to obtain the optimal calibration result;

[0019] Close the test platform hatch, reduce the test vacuum to below 400Pa, set the squeeze oil film supply pressure to 0.2MPa, 0.4MPa, 0.6MPa and 0.8MPa in sequence, and then rotate the engine rotor at a speed of 15.7rad / s. 2 The angular acceleration gradually increases to 40,000 r / min;

[0020] By analyzing the measurement results of each channel under the same oil film supply pressure, the changes in the rotor axis trajectory under different speeds are obtained. By analyzing the measurement results under different oil film supply pressures at the same speed, the influence of different oil supply pressures on the rotor dynamic characteristics can be obtained.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] The engine rotor and the test platform are connected by using an adapter structure, and the oil pressure sensor is embedded in it without interfering with the test piece and the test equipment, so as to realize real-time measurement of the oil film pressure value of the engine rotor squeeze film damper and dynamic tracking of the distribution of the oil film pressure. It accurately reflects the changes in the oil film pressure of the rotor squeeze film damper under the influence of real external factors (such as speed, oil supply pressure, oil temperature, imbalance, etc.), laying the foundation for verifying and optimizing the rotor squeeze film damper model. Compared with the existing technology, it avoids the errors caused by the distortion of boundary conditions and the incompleteness of traditional test methods, and can realize real-time measurement and dynamic tracking of the oil film pressure value in the entire test speed range, thereby more accurately reflecting the dynamic characteristics of the oil film pressure.

[0023] In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a structural schematic diagram of the oil film pressure measurement test device of the squeeze film damper of the present invention;

[0026] Figure 2 yes Figure 1 Schematic diagram of the cross-section structure;

[0027] Figure 3 It is a schematic cross-sectional structural diagram of the adapter of the present invention;

[0028] Figure 4It is a structural schematic diagram of the oil pressure sensor of the present invention.

[0029] Legend:

[0030] 1. Adapter; 2. Spring-loaded mounting bolts; 3. Engine rotor journal; 4. Squirrel cage spring; 5. Expanding ring; 6. Oil pressure sensor; 7. Extrusion oil film cavity; 8. Bearing; 9. Expanding ring mounting groove; 10. Spring-loaded centering cylinder; 11. Spring-loaded mounting hole; 12. Sensor lead groove; 13. Adapter centering cylinder; 14. Adapter mounting hole; 15. Sensor mounting hole; 16. Sensor fixing threaded hole; 17. Extrusion oil film cavity outer ring; 18. Extrusion oil film oil filling hole; 19. Extrusion oil film oil circuit; 20. Oil pipe head interface; 21. Sensor probe; 22. Sensor mounting thread; 23. Sealing ring; 24. Fastening hexagon; 25. Sensor lead. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0032] The following is combined with Figure 1-4 This application is described in further detail.

[0033] The embodiments of the present application disclose an apparatus and method for measuring the oil film pressure of an engine rotor squeeze film damper.

[0034] Reference Figure 1 The oil film pressure measuring device of the engine rotor squeeze film damper includes an adapter 1, a squirrel cage spring 4, a squeeze film damper and an oil pressure sensor 6; the adapter 1 is annular, the squirrel cage spring 4 is fixedly installed in the cavity of the adapter 1, the engine rotor shaft neck 3 is passed through the squirrel cage spring 4, and a bearing 8 is arranged between the squirrel cage spring 4 and the engine rotor; the squeeze film damper includes a squeeze film outer ring, a squeeze film cavity 7 and a squeeze film inner ring, the squeeze film outer ring is the inner wall of the adapter 1, the squeeze film inner ring is the outer wall of the squirrel cage spring, and the squeeze film cavity 7 is located between the squeeze film outer ring and the squeeze film inner ring; a sensor mounting hole 15 is opened on the adapter 1, the oil pressure sensor 6 is installed in the sensor mounting hole 15, and the sensor probe 21 of the oil pressure sensor 6 extends into the squeeze oil film cavity 7.

[0035] The adapter 1 is fixed on the test platform support and is used in conjunction with components such as the squirrel cage spring support 4 and the squeeze oil film damper to provide a stable installation foundation and ensure the concentricity of the system, thereby ensuring the accuracy of the measurement; the squirrel cage spring support 4 is fixedly installed in the cavity of the adapter 1, and the engine rotor shaft neck 3 is passed through it, connected by the bearing 8 to absorb vibration and ensure the smooth operation of the rotor; the squeeze oil film damper includes a squeeze oil film outer ring, a squeeze oil film cavity 7 and a squeeze oil film inner ring, wherein the squeeze oil film outer ring is the inner wall of the adapter 1, and the squeeze oil film inner ring is the outer wall of the squirrel cage spring support 4, and a squeeze oil film cavity 7 is formed between the two. During the rotation of the rotor, the oil film in the oil film cavity will generate pressure as the speed changes, and this pressure plays a key role in vibration reduction and energy absorption; the oil pressure sensor 6 is installed in the sensor mounting hole 15 on the adapter 1, and its probe is inserted into the squeeze oil film cavity 7 to measure the oil film pressure in real time, and transmit the data to the data acquisition system through the sensor lead 25 to dynamically record and analyze the changes in the oil film pressure. The main functions and advantages include: connecting the engine rotor and the test platform through the adapter 1, realizing real-time measurement and dynamic tracking of the oil film pressure value, accurately reflecting the changes in the oil film pressure under the influence of real external factors (such as speed, oil supply pressure, oil temperature, imbalance, etc.), laying the foundation for verifying and optimizing the squeeze film damper model, and solving the error problems caused by boundary condition distortion and incomplete experiments in traditional methods, realizing real-time measurement and dynamic tracking of the oil film pressure value within the entire test speed range, and more accurately reflecting the dynamic characteristics of the oil film pressure.

[0036] Reference Figure 2 and Figure 3 Adapter 1 is provided with a sensor fixing threaded hole 16 that communicates with sensor mounting hole 15, and oil pressure sensor 6 is provided with a corresponding sensor mounting thread 22. This threaded connection method facilitates sensor installation and removal, enhances the overall stability and durability of the system, and enables it to obtain stable and reliable measurement data even under high speeds and complex operating conditions.

[0037] The oil pressure sensor 6 is provided with a fastening hexagonal bolt 24, and a sealing ring 23 is sleeved on the oil pressure sensor 6. The sealing ring 23 is located between the fastening hexagonal bolt 24 and the adapter 1. The fastening hexagonal bolt 24 is used to cooperate with a wrench to facilitate tightening the oil pressure sensor 6 using the wrench.

[0038] The outer ring of the extruded oil film is circumferentially provided with a mounting groove for the expansion ring 5. Two mounting grooves are axially provided, with expansion rings 5 ​​correspondingly mounted in each groove. The sensor probe 21 of the oil pressure sensor 6 is located between the two mounting grooves. The mounting groove accommodates the expansion ring 5, providing an elastic seal to prevent pressure leakage within the oil film cavity and improve the system's sealing effectiveness. The axial arrangement of the two mounting grooves for the expansion ring 5 further stabilizes the outer ring structure, enhancing its overall mechanical strength and vibration resistance. The sensor probe 21 of the oil pressure sensor 6 is located between the two mounting grooves for the expansion ring 5. This design ensures that the sensor probe 21 is in the optimal measurement position, avoiding interference from the expansion ring 5, thereby accurately measuring the oil film pressure.

[0039] Adapter 1 is provided with an extrusion oil film filling hole 18 that communicates with extrusion oil film cavity 7. This filling hole 18 is connected to an extrusion oil film oil circuit 19, at the end of which is an oil pipe connector 20. The extrusion oil film filling hole 18 communicates with the extrusion oil film cavity 7, allowing lubricating oil to be directly injected into the cavity, maintaining the formation and stability of the oil film. The extrusion oil film oil circuit 19 connects the filling hole to an external oil source, ensuring a continuous supply of lubricating oil. The oil pipe connector 20, located at the end of the oil circuit, is used to connect to an external oil supply pipeline, facilitating the input and control of lubricating oil. This design ensures that there is always sufficient lubricating oil in the extrusion oil film cavity 7, effectively reducing friction and wear, and improving the operating efficiency and lifespan of the system.

[0040] Reference Figure 3 and Figure 4 A sensor lead 25 is provided at the end of the oil pressure sensor 6 away from the sensor probe 21. A sensor lead slot 12 is provided at the end of the sensor mounting hole 15 of the adapter 1. The position and size of the sensor lead slot 12 match the sensor lead 25. The sensor lead 25 transmits the measured oil film pressure signal to the external data acquisition system, ensuring real-time monitoring and recording. The position and size of the sensor lead slot 12 match the sensor lead 25, effectively preventing damage to the lead such as squeezing, pulling, or bending, thereby ensuring the stability and reliability of signal transmission. This design not only simplifies the sensor installation process but also ensures the safe arrangement of the lead, preventing measurement errors or failures caused by lead damage, and improving the durability and stability of the entire measurement system.

[0041] The adapter 1 comprises a centering cylindrical surface for the squirrel cage spring support 4 and a centering cylindrical surface for the adapter 1. The centering cylindrical surface for the spring support 4 is used to mate with the cylindrical surface of the squirrel cage spring support 4, while the centering cylindrical surface for the adapter 1 is used to mate with the cylindrical surface of the test platform support. The coordination of the centering cylindrical surface of the spring support 4 with the cylindrical surface of the squirrel cage spring support 4 ensures accurate positioning of the squirrel cage spring support 4 within the adapter 1, improving the coaxiality and stability of the engine rotor. At the same time, the coordination of the centering cylindrical surface of the adapter 1 with the cylindrical surface of the test platform support allows the adapter 1 to be securely mounted on the test platform, ensuring the coaxiality and stability of the overall system and avoiding instability and measurement errors caused by installation errors. This allows the adapter 1 to maintain good coaxiality and mechanical stability under high speeds and complex operating conditions, improving the accuracy and consistency of measurement data, extending equipment life, and reducing maintenance costs.

[0042] There are multiple oil pressure sensors 6 evenly spaced along the circumference of the adapter 1. This structure can realize comprehensive monitoring of oil pressure data in different directions, ensuring that the acquired oil pressure information is more accurate and comprehensive, thereby improving the overall measurement accuracy and reliability of the system. At the same time, this multi-point monitoring method can also detect local abnormal changes in a timely manner. During the operation of the test rotor, due to the influence of factors such as the imbalance, the axis trajectory is constantly changing, so the measurement results of the sensors at each measuring point are inconsistent. Using the oil film pressure measurement results, the oil film pressure distribution at the squeeze oil film can be known, and then the axis trajectory can be calculated.

[0043] According to another aspect of the present invention, a method for measuring the oil film pressure of an engine rotor squeeze film damper is provided, comprising the following steps:

[0044] 1. Install the oil film pressure measuring device of the engine rotor squeeze film damper with the engine rotor on the test platform and align it to ensure that the engine rotor and the input end of the test platform are on the same axis.

[0045] First, the measuring device needs to be firmly installed at the designated position of the test platform by bolts or other fixing devices to ensure that it is stable and not easy to move. Then, use a laser plummet or other high-precision alignment tools to accurately adjust the engine rotor and the test bench input end to ensure that the two are on the same axis. During the alignment process, it is necessary to continuously adjust the position and angle of the device and repeatedly check the alignment results until the required coaxiality standard is met. After confirmation, all connectors can be tightened to ensure that there will be no loosening or deviation during operation. The purpose of this implementation method is to reduce the vibration and wear caused by misalignment, thereby improving the system's operating stability and measurement accuracy. At the same time, it can also ensure the consistency of experimental conditions, providing a reliable basis for subsequent oil film pressure data collection and analysis.

[0046] 2. Connect the oil pressure sensor 6 of the oil film pressure measuring device of the engine rotor squeeze film damper to each channel of the data acquisition device, adjust the platform squeeze oil film supply pressure to 0.2Mpa, 0.4Mpa, 0.6Mpa and 0.8MPa, and maintain it for 30 seconds, obtain the one-to-one corresponding measurement values ​​of the oil pressure sensor 6, and then use the least squares method to fit the measurement values ​​of the oil pressure sensor 6 to obtain the optimal calibration result.

[0047] Connect the oil pressure sensor 6 of the oil film pressure measuring device of the engine rotor squeeze film damper to each channel of the data acquisition device. First, ensure that the leads of all sensors are correctly connected to the corresponding channels of the data acquisition device, and ensure that the connection is firm to avoid interference during signal transmission. Then adjust the platform squeeze oil film supply pressure to 0.2MPa, 0.4MPa, 0.6MPa and 0.8MPa in sequence, and maintain it at each set pressure for 30 seconds. The data acquisition system automatically records the measurement value of the oil pressure sensor 6 corresponding to each pressure point. During this process, pay attention to continuously monitor the system status to ensure that the pressure is stable and there is no abnormal fluctuation. After the data collection of all pressure points is completed, all measurement results are imported into the calculation software, and the least squares method is used to fit and calculate the measurement values ​​of these oil pressure sensors 6, so as to find the correction curve of the sensor and obtain the optimal calibration result. The purpose of this implementation is to eliminate the systematic error and nonlinear error of the sensor through multi-point calibration, improve the measurement accuracy and data reliability of the sensor, and provide an accurate benchmark for subsequent experiments. At the same time, the calibration results can be used to confirm whether the working status of the sensor is normal, ensuring the stable performance of the entire measurement system.

[0048] 3. Close the test platform hatch, reduce the test vacuum to below 400Pa, set the oil film supply pressure to 0.2Mpa, 0.4Mpa, 0.6Mpa and 0.8MPa in sequence, and then rotate the engine rotor at a speed of 15.7rad / s. 2 The angular acceleration gradually increases to 40,000 r / min.

[0049] Close the test platform hatch, seal it, and start the vacuum pump equipment. Gradually reduce the vacuum degree in the test chamber to below 400Pa to ensure the low-pressure stable state of the experimental environment. Then adjust the pressure of the squeeze oil film supply system to 0.2MPa, 0.4MPa, 0.6MPa and 0.8MPa in sequence, and perform sufficient pressure stabilization operation at each set pressure to ensure pressure stability. At the same time, the speed of the engine rotor is gradually increased by 15.7rad / s through the control system. 2The angular acceleration is slowly increased to 40,000 r / min. During this process, various parameters need to be continuously monitored, including speed, vibration, temperature, and oil film pressure, to ensure that the entire acceleration process is smooth and correct and that all systems operate normally. The purpose of this implementation is to simulate actual working conditions in a low-pressure environment, making the experimental results more realistic. At the same time, increasing the oil supply pressure and gradually increasing the speed in stages can effectively avoid the impact and damage to the system caused by instantaneous overload, improve the safety of the experiment and the reliability of the data, and thus provide a stable and realistic foundation for subsequent data analysis.

[0050] 4. Analyze the measurement results of each channel under the same oil film supply pressure to obtain the changes in the rotor axis trajectory at different speeds. Analyze the measurement results under different oil film supply pressures at the same speed to obtain the impact of different oil supply pressures on the rotor dynamic characteristics.

[0051] To analyze the measurement results of each channel under the same oil film supply pressure, it is first necessary to export the oil film pressure data and rotor axis position data recorded by each sensor at different speeds from the data acquisition system. Then, data processing software is used to organize and classify this data, grouping it according to different speeds and oil supply pressures. Calculation and drawing tools are then used to analyze the axis trajectory changes in each data set. Specifically, a dynamic trajectory diagram of the rotor at different speeds can be drawn to intuitively display the motion characteristics of the rotor axis. At the same time, by comparing the measurement results of different oil supply pressures at the same speed, a pressure-trajectory change curve can be further generated to reveal the impact of oil supply pressure on the rotor dynamic characteristics. These analysis steps require the use of statistical and computational methods, such as Fourier transform and frequency domain analysis, to extract and evaluate the main motion modes and frequency components. Through this detailed data analysis, not only can the dynamic behavior of the rotor under various operating conditions be accurately understood, but the specific impact of oil supply pressure on rotor stability and vibration characteristics can also be identified, thereby providing a scientific basis for optimized design and fault prevention, and improving the system's operating performance and reliability.

[0052] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An oil film pressure measuring device for an engine rotor squeeze film damper, characterized in that: It comprises an adapter (1), a squirrel cage spring support (4), a squeeze film damper and an oil pressure sensor (6); The adapter (1) is annular, the squirrel cage spring support (4) is fixedly installed in the cavity of the adapter (1), the engine rotor shaft neck (3) is arranged in the squirrel cage spring support (4), and a bearing (8) is arranged between the squirrel cage spring support (4) and the engine rotor; the squeeze film damper comprises a squeeze film outer ring, a squeeze film cavity (7) and a squeeze film inner ring, the squeeze film outer ring is the inner wall of the adapter (1), the squeeze film inner ring is the outer wall of the squirrel cage spring, and the squeeze film cavity (7) is located between the squeeze film outer ring and the squeeze film inner ring; The adapter (1) is provided with a sensor mounting hole (15), the oil pressure sensor (6) is mounted in the sensor mounting hole (15), and the sensor probe (21) of the oil pressure sensor (6) extends into the extruded oil film cavity (7); An expansion ring (5) mounting groove is provided on the outer ring of the squeeze oil film along the circumferential direction, two expansion ring (5) mounting grooves are provided along the axial direction, an expansion ring (5) is correspondingly mounted in each expansion ring (5) mounting groove, and a sensor probe (21) of the oil pressure sensor (6) is located between the two expansion ring (5) mounting grooves; The adapter seat (1) has a squirrel cage spring support (4) centering cylindrical surface and an adapter seat (1) centering cylindrical surface structure, the spring support (4) centering cylindrical surface is used to cooperate with the cylindrical surface of the squirrel cage spring support (4), and the adapter seat (1) centering cylindrical surface is used to cooperate with the cylindrical surface of the test platform support; A plurality of oil pressure sensors (6) are evenly spaced along the circumference of the adapter (1).

2. The oil film pressure measuring device for an engine rotor squeeze film damper according to claim 1, characterized in that: The adapter (1) is provided with a sensor fixing threaded hole (16) communicating with the sensor mounting hole (15), and the oil pressure sensor (6) is provided with a corresponding sensor mounting thread (22).

3. The oil film pressure measuring device for an engine rotor squeeze film damper according to claim 2, characterized in that: The oil pressure sensor (6) is provided with a fastening hexagon (24), and a sealing ring (23) is sleeved on the oil pressure sensor (6). The sealing ring (23) is located between the fastening hexagon (24) and the adapter (1).

4. The oil film pressure measuring device for an engine rotor squeeze film damper according to claim 1, characterized in that: The adapter (1) is provided with an extrusion oil film filling hole (18) communicating with the extrusion oil film cavity (7); the extrusion oil film filling hole (18) is connected to an extrusion oil film oil circuit (19); and an oil pipe head interface (20) is provided at the end of the extrusion oil film oil circuit (19).

5. The oil film pressure measuring device for an engine rotor squeeze film damper according to claim 4, characterized in that: A sensor lead (25) is provided at one end of the oil pressure sensor (6) away from the sensor probe (21), and a sensor lead groove (12) is provided at the end of the sensor mounting hole (15) of the adapter (1), wherein the position and size of the sensor lead groove (12) match those of the sensor lead (25).

6. A method for measuring the oil film pressure of an engine rotor squeeze film damper, using the engine rotor squeeze film damper oil film pressure measuring device according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: installing an oil film pressure measuring device of an engine rotor squeeze film damper with an engine rotor mounted thereon on a test platform, and performing centering to ensure that the engine rotor and an input end of the test platform are on the same axis; The oil pressure sensor (6) of the oil film pressure measuring device of the engine rotor squeeze film damper is connected to each channel of the data acquisition device, and the platform squeeze film oil supply pressure is adjusted to 0.2 MPa, 0.4 MPa, 0.6 MPa and 0.8 MPa, and maintained for 30 seconds, and the oil pressure sensor (6) measurement value with a one-to-one correspondence is obtained. Then, the oil pressure sensor (6) measurement value is fitted and calculated using the least square method to obtain the optimal calibration result; Close the test platform hatch, reduce the test vacuum to below 400Pa, set the squeeze oil film supply pressure to 0.2MPa, 0.4MPa, 0.6MPa and 0.8MPa in sequence, and then rotate the engine rotor at a speed of 15.7rad / s. 2 The angular acceleration gradually increases to 40,000 r / min; The measurement results of each channel under the same oil film supply pressure are analyzed to obtain the change of the rotor axis trajectory under different speeds. The measurement results under different oil film supply pressures at the same speed are analyzed to further generate a pressure-trajectory change curve, which can be used to obtain the impact of different oil supply pressures on the rotor dynamic characteristics.

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