Device and method for measuring oil film pressure of extrusion oil film damper of engine rotor

Abstract

The invention discloses an oil film pressure measuring device for an engine rotor squeeze oil film damper. The oil film pressure measuring device comprises an adapter, a squirrel cage elastic support, the squeeze oil film damper and an oil pressure sensor. The adapter seat is annular, the squirrel cage elastic support is fixedly installed in a cavity of the adapter seat, an engine rotor shaft neck is arranged in the squirrel cage elastic support in a penetrating mode, and a bearing is arranged between the squirrel cage elastic support and an 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 the inner wall of the adapter, the squeeze oil film inner ring is the outer wall of the squirrel cage bullet, 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, the oil pressure sensor is mounted in the sensor mounting hole, and a sensor probe of the oil pressure sensor extends into the extrusion oil film cavity. The extrusion oil film damper has the advantage that the oil film pressure change in the extrusion oil film damper can be conveniently obtained.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft 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 system of small and medium-sized aircraft engines. They can effectively absorb the vibration energy caused by the residual imbalance of the rotor, significantly reduce the vibration displacement of the rotor and reduce the load on the bearing, improve the working stability and reliability of the engine, and extend the working life of the bearing. As an important performance indicator of the squeeze film damper, the oil film pressure is closely related to the oil film stiffness coefficient and damping coefficient. It has great engineering value for verifying and optimizing the dynamic analysis model of the squeeze film damper and minimizing the engine vibration.

[0003] At present, the research methods of oil film pressure in squeeze film dampers are generally divided into theoretical calculation or indirect test. Theoretical calculation includes numerical analysis method and analytical method. Indirect test generally simply replaces the oil film pressure in the squeeze film damper with the inlet oil pressure. Since the factors affecting the squeeze film damper in actual work are complex and diverse, the boundary conditions assumed in the theoretical calculation will be quite different from the actual situation, resulting in certain errors and limitations in the theoretical analysis; and there is a large difference between the inlet oil pressure and the oil film pressure inside the squeeze film damper, and in the rotor test process, the oil film pressure and distribution are a dynamic change process with the speed, so the indirect test method is not suitable for the study of oil film pressure. Summary of the invention

[0004] The 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 support, a squeeze film damper and an oil pressure sensor;

[0006] The adapter is annular, the squirrel cage spring support is fixedly installed in the cavity of the adapter, the engine rotor journal is inserted into the squirrel cage spring support, and a bearing is arranged between the squirrel cage spring support and the engine rotor;

[0007] The squeeze film damper comprises a squeeze film outer ring, a squeeze film cavity and a squeeze film inner ring, wherein 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] The adapter is provided with a sensor mounting hole, the oil pressure sensor is mounted in the sensor mounting hole, and the 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.

[0011] Optionally, an expansion ring installation groove is circumferentially arranged on the extrusion oil film outer ring, two expansion ring installation grooves are axially arranged, and expansion rings are correspondingly installed in the expansion ring installation grooves. The sensor probe of the oil pressure sensor is located between the two expansion ring installation grooves.

[0012] Optionally, an extrusion oil film filling hole communicating with the extrusion oil film cavity is provided in the adapter, 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 to avoid the sensor lead.

[0014] Optionally, the adapter seat has a 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 the center 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 measuring 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 keep 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, draw the test vacuum to below 400Pa, set the squeeze film oil supply pressure to 0.2Mpa, 0.4Mpa, 0.6Mpa and 0.8MPa in sequence, and then gradually increase the engine rotor angular acceleration to 40000r / min at 15.7rad / s2;

[0020] By analyzing the measurement results of each channel under the same oil film supply pressure, the change of the rotor axis trajectory under different speeds can be 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, the present 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, accurately reflecting the change of 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.), and laying a 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 whole test speed range, so as to more accurately reflect the dynamic characteristics of the oil film pressure.

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

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

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

[0026] Figure 2 yes Figure 1 A schematic cross-sectional structure diagram of ;

[0027] Figure 3 It is a schematic diagram of the cross-sectional structure 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 bolt; 3. Engine rotor journal; 4. Spring-loaded support; 5. Expanding ring; 6. Oil pressure sensor; 7. Extrusion oil film cavity; 8. Bearing; 9. Expanding ring mounting groove; 10. Spring-loaded support centering cylindrical surface; 11. Spring-loaded support mounting hole; 12. Sensor lead groove; 13. Adapter centering cylindrical surface; 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 oil film pressure measuring device and method for an engine rotor squeeze film damper.

[0034] Reference Figure 1 The oil film pressure measuring device of the engine rotor squeeze film damper 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 penetrated 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; 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 film cavity 7.

[0035] The adapter 1 is fixed on the test platform support and used in conjunction with the squirrel cage spring support 4, the squeeze oil film damper and other components 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 inserted therein, and is connected through 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 the 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 installation 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 change of the oil film pressure under the action 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 full test speed range, and more accurately reflecting the dynamic characteristics of the oil film pressure.

[0036] Reference Figure 2 and Figure 3 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. This threaded connection method facilitates the installation and removal of the sensor, enhances the overall stability and durability of the system, and enables it to obtain stable and reliable measurement data under high speed and complex working conditions.

[0037] The oil pressure sensor 6 is provided with a tightening hexagon 24, and a sealing ring 23 is sleeved on the oil pressure sensor 6, and the sealing ring 23 is located between the tightening hexagon 24 and the adapter 1. The tightening hexagon 24 is used to cooperate with a wrench, so that the oil pressure sensor 6 can be tightened using the wrench.

[0038] The outer ring of the extruded oil film is provided with an expansion ring 5 mounting groove along the circumference, and two expansion ring 5 mounting grooves are provided along the axial direction. An expansion ring 5 is correspondingly installed in the expansion ring 5 mounting groove, and the sensor probe 21 of the oil pressure sensor 6 is located between the two expansion ring 5 mounting grooves. The expansion ring 5 mounting groove is used to accommodate the expansion ring 5, and the expansion ring 5 provides elastic sealing to prevent pressure leakage in the oil film cavity and improve the sealing effect of the system; the arrangement of the two expansion ring 5 mounting grooves in the axial direction can better stabilize the outer ring structure and enhance the overall mechanical strength and anti-vibration ability; the sensor probe 21 of the oil pressure sensor 6 is located between the two expansion ring 5 mounting grooves. Such a design can ensure that the sensor probe 21 is in the best measurement position to avoid interference from the expansion ring 5, thereby accurately measuring the oil film pressure.

[0039] The adapter 1 is provided with an extrusion oil film filling hole 18 connected to the extrusion oil film cavity 7, the extrusion oil film filling hole 18 is connected to the 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. The extrusion oil film filling hole 18 is connected to the extrusion oil film cavity 7, so that the lubricating oil can be directly injected into the oil film cavity to maintain the formation and stability of the oil film; the extrusion oil film oil circuit 19 connects the filling hole with an external oil source to ensure the continuous supply of lubricating oil; the oil pipe head interface 20 is located at the end of the oil circuit and is used to connect to an external oil supply pipeline to facilitate the input and control of lubricating oil. This design ensures that there is always sufficient lubricating oil in the extrusion oil film cavity 7, thereby effectively reducing friction and wear and improving the working efficiency and life of the system.

[0040] Reference Figure 3 and Figure 4 , 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 25 slot 12 is provided at the end of the sensor mounting hole 15 of the adapter 1, and the position and size of the sensor lead 25 slot 12 match the sensor lead 25 to avoid the sensor lead 25. The sensor lead 25 transmits the measured oil film pressure signal to the external data acquisition system to ensure real-time monitoring and recording; the position and size of the sensor lead 25 slot 12 match the sensor lead 25, effectively avoiding the lead from being squeezed, pulled or bent, etc., thereby ensuring the stability and reliability of signal transmission. This design not only simplifies the installation process of the sensor, but also ensures the safe arrangement of the lead, prevents measurement errors or failures caused by damage to the lead, and improves the durability and stability of the entire measurement system.

[0041] The adapter 1 has a centering cylindrical surface of the spring support 4 and a centering cylindrical surface structure of the adapter 1. The centering cylindrical surface of the spring support 4 is used to cooperate with the cylindrical surface of the squirrel cage spring support 4, and the centering cylindrical surface of the adapter 1 is used to cooperate with the cylindrical surface of the test platform support. The centering cylindrical surface of the spring support 4 cooperates with the cylindrical surface of the squirrel cage spring support 4 to ensure the accurate positioning of the squirrel cage spring support 4 in the adapter 1, thereby improving the coaxiality and stability of the engine rotor. At the same time, the centering cylindrical surface of the adapter 1 cooperates with the cylindrical surface of the test platform support to enable the adapter 1 to be firmly installed on the test platform, thereby ensuring the coaxiality and stability of the overall system, avoiding instability and measurement errors caused by installation errors, thereby maintaining good coaxiality and mechanical stability under high speeds and complex working conditions, improving the accuracy and consistency of measurement data, and extending the life of the equipment 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 time. During the operation of the test rotor, due to the influence of factors such as 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 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.

[0045] First, the measuring device needs to be firmly installed at the specified position of the test platform through bolts or other fixing devices to ensure that it is stable and not easy to move. Then use a laser alignment instrument or other high-precision alignment tools to accurately align the engine rotor and the input end of the test bench 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 operating stability and measurement accuracy of the system. At the same time, it can also ensure the consistency of experimental conditions, providing a reliable foundation 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 oil pressure sensor 6 measurement value, and then use the least squares method to fit the oil pressure sensor 6 measurement value 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 to 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 each set pressure for 30 seconds. The oil pressure sensor 6 measurement value corresponding to each pressure point is automatically recorded by the data acquisition system. 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 role 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, draw the test vacuum to below 400Pa, set the extrusion oil film supply pressure to 0.2Mpa, 0.4Mpa, 0.6Mpa and 0.8MPa respectively, and then gradually increase the engine rotor angular acceleration to 40000r / min at 15.7rad / s2.

[0049] Close the test platform hatch, seal it, and start the vacuum pump equipment to gradually reduce the vacuum degree in the test cabin 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 turn, 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 through a low-pressure environment, making the experimental results more realistic. At the same time, increasing the oil supply pressure in stages and gradually increasing the speed can effectively avoid the impact and damage to the system caused by instantaneous overload, improve the safety of the experiment and data reliability, 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 change of the rotor axis trajectory at different speeds. Analyze the measurement results under different oil film supply pressures at the same speed to obtain the influence 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, and then use data processing software to organize and classify these data, group them according to different speeds and oil supply pressures, and then use calculation and drawing tools to analyze the axis trajectory changes in each group of data. 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 influence of oil supply pressure on the rotor dynamic characteristics. These analysis steps require the use of statistical and calculation methods, such as Fourier transform, frequency domain analysis, etc., to extract and evaluate the main motion modes and frequency components. Through these detailed data analysis, not only can the dynamic behavior of the rotor under various working conditions be accurately understood, but also the specific influence of oil supply pressure on rotor stability and vibration characteristics can be found, thereby providing a scientific basis for optimized design and fault prevention, and improving the system's operating performance and reliability.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope 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 seat (1) is annular, the squirrel cage spring support (4) is fixedly installed in the cavity of the adapter seat (1), the engine rotor shaft neck (3) is inserted into 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 seat (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 extrusion oil film cavity (7).

2. The oil film pressure measuring device of the engine rotor squeeze film damper according to claim 1, characterized in that: The adapter (1) is provided with a sensor fixing threaded hole (16) which is in communication 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 of the 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), and the sealing ring (23) is located between the fastening hexagon (24) and the adapter (1).

4. The oil film pressure measuring device of the engine rotor squeeze film damper according to claim 1, characterized in that: An expansion ring (5) mounting groove is arranged circumferentially on the outer ring of the extrusion oil film, two expansion ring (5) mounting grooves are arranged axially, an expansion ring (5) is correspondingly mounted in the 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.

5. The oil film pressure measuring device of the 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) which is in communication 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).

6. The oil film pressure measuring device of the engine rotor squeeze film damper according to claim 5, characterized in that: A sensor lead (25) is provided at one end of the oil pressure sensor (6) away from the sensor probe (21); a sensor lead (25) 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 (25) slot (12) match the sensor lead (25) to avoid the sensor lead (25).

7. The oil film pressure measuring device of the engine rotor squeeze film damper according to claim 1, characterized in that: The adapter seat (1) comprises a spring support (4) centering cylindrical surface and an adapter seat (1) centering cylindrical surface structure, wherein 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.

8. The oil film pressure measuring device of the engine rotor squeeze film damper according to claim 6, characterized in that: A plurality of oil pressure sensors (6) are evenly spaced along the circumference of the adapter (1).

9. 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 8, 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 aligning the center 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 0.2Mpa, 0.4Mpa, 0.6Mpa and 0.8MPa, and maintained for 30 seconds, and the oil pressure sensor (6) measurement value with one-to-one correspondence is obtained, and 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, draw the test vacuum to below 400Pa, set the squeeze film oil supply pressure to 0.2Mpa, 0.4Mpa, 0.6Mpa and 0.8MPa in sequence, and then gradually increase the engine rotor angular acceleration to 40000r / min at 15.7rad / s2; By analyzing the measurement results of each channel under the same oil film supply pressure, the change of the rotor axis trajectory under different speeds can be 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.

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