Lubricating oil interruption test method and test device for squeeze film damper

Abstract

The invention relates to a lubricating oil interruption test method and test device for a squeeze film damper. The test method comprises the following steps: S1, building a test device, and installing a test piece on the test device; s2, supplying oil to the test piece to enable the test piece to be in a stable working state, and measuring performance parameters of the test piece to obtain a first group of data; s3, cutting off oil supply to the test piece, and timing T0 when the test piece is in a lubricating oil interruption state; s4, continuously measuring performance parameters of the test piece to obtain a second group of data; s5, after timing reaches T0 + 15s, oil supply of the test piece is recovered, performance parameters of the test piece are continuously measured, and a third group of data is obtained; s6, after the test piece recovers the stable working state, timing T1, and measuring performance parameters of the test piece to obtain a fourth group of data; and S7, analyzing the first group of data, the second group of data, the third group of data and the fourth group of data. And the lubricating oil interruption test independently aiming at the squeeze film damper is realized.

Description

Technical Field

[0001] The technical field of the present invention relates to a lubricating oil interruption test method and test device for a squeeze film damper. Background Art

[0002] The vibration mechanism and its control of aeroengines have always been a major topic in the aviation field. Among them, the lateral vibration of the rotating shaft caused by rotor imbalance is the main source of engine vibration. For a high-speed rotating rotor, in addition to changing the critical speed by adjusting the rotor stiffness, it is also possible to increase the damping by using a squeeze film damper (SFD) to reduce vibration.

[0003] SFD is a vibration damping device for aeroengine rotors. According to the hydrodynamic lubrication theory, an oil film is formed in the gap between the outer ring of the rolling bearing and the bearing housing at the support of the engine rotor, and the dissipation effect generated by the squeezing flow of the viscous fluid is used to increase the system damping. It has the characteristics of simple structure and good vibration reduction performance. In the design of most aeroengines equipped with SFD, while the lubricating oil system supplies lubricating fluid to the engine bearings and accessory boxes, a bypass with a higher oil pressure is branched off to supply the squeeze film damper to form an oil film.

[0004] In actual operation, due to the negative gravitational acceleration during the maneuvering flight of the aircraft, it may cause the oil in the lubricating oil tank to float above the oil outlet, and the damage of the oil tank may lead to lubricating oil leakage, resulting in the interruption of lubricating oil supply, a rapid drop in the oil pressure of the lubricating oil system, severe friction and heating of transmission parts such as gears and bearings, and even engine failure. During the lubricating oil interruption process, the squeeze film damper also faces the risk of oil film rupture due to oil cut-off, damping reduction, and excessive rotor vibration. Therefore, during the design and development of aeroengines, it is necessary to consider that the engine still has normal working ability under the condition of lubricating oil interruption, and conduct corresponding test verification, that is, the lubricating oil interruption test.

[0005] Article 33.71 of the airworthiness standards for aeroengines (CCAR-33R2) clearly states that it is required to verify that each lubricating system must be able to work normally under the flight attitudes and atmospheric conditions expected for the aircraft, including the investigation of lubricating oil interruption caused by negative gravitational acceleration. The lubricating oil system of aeroengines should pass the whole-engine lubricating oil interruption test to ensure that after the lubricating oil supply is interrupted for a certain period of time and restored, the engine works normally throughout the process, and all indicators do not exceed the limits, so as to verify its airworthiness. Summary of the Invention

[0006] The purpose of the present invention is to provide a lubricating oil interruption test method for a squeeze film damper.

[0007] Another purpose of the present invention is to provide a lubricating oil interruption test device for a squeeze film damper.

[0008] A lubricating oil interruption test method for a squeeze film damper according to one aspect of the present invention includes: S1. Constructing a test device and installing a test piece on the test device; S2. Supplying oil to the test piece to make the test piece in a stable working state, measuring the performance parameters of the test piece, and obtaining a first set of data; S3. Cutting off the oil supply to the test piece, waiting for the test piece to be in a lubricating oil interruption state, and timing T0; S4. Continuously measuring the performance parameters of the test piece to obtain a second set of data; S5. After the timing reaches T0 + 15 s, restoring the oil supply to the test piece and continuously measuring the performance parameters of the test piece to obtain a third set of data; S6. Waiting for the test piece to restore the stable working state, timing T1, measuring the performance parameters of the test piece, and obtaining a fourth set of data; S7. Analyzing the first set of data, the second set of data, the third set of data, and the fourth set of data.

[0009] The technical solution of the present application can separately monitor and analyze the SFD to study the changes of various parameters under the lubricating oil interruption state, and study the performance changes of the SFD during the whole process of the lubricating oil interruption test, providing data support for the design of the SFD and risk guidance for the lubricating oil interruption test of the whole machine.

[0010] In one or more embodiments of the lubricating oil interruption test method for the squeeze film damper, in step S1, the test device includes a rotor system, and the test piece is installed on the rotor system; in step S2, the rotational speed of the rotor system is increased to the normal operating speed to drive the test piece to rotate so that the test piece is in the stable working state.

[0011] In one or more embodiments of the lubricating oil interruption test method for the squeeze film damper, in step S1, the test device further includes a signal acquisition and processing system, the signal acquisition and processing system is connected to the test piece, the signal acquisition and processing system includes an exciter, a force sensor, and a displacement sensor, the force sensor and the displacement sensor are arranged on the test piece, and the exciter is connected to the force sensor and provides an exciting force; in steps S2, S4, S5, and S6, the performance parameters of the test piece include the exciting force and the displacement response, the force sensor measures the exciting force, and the displacement sensor measures the displacement response.

[0012] In one or more embodiments of the lubricating oil interruption test method for the squeeze film damper, in step S1, the test device further includes a differential pressure sensor assembly and a metal chip sensor. The differential pressure sensor assembly is arranged upstream of the test piece, and the metal chip sensor is arranged downstream of the test piece. In steps S2, S4, S5, and S6, the performance parameters of the test piece further include the differential pressure and the change in the metal chip content. The differential pressure sensor assembly measures the differential pressure, and the metal chip sensor measures the change in the metal chip content.

[0013] In one or more embodiments of the lubricating oil interruption test method for the squeeze film damper, in step S1, the test device further includes an oil supply pump. The oil supply pump is fluidly connected upstream of the test piece to pressurize the pressure of the lubricating oil input into the test piece to the lubricating oil pressure entering the squeeze film damper during the whole-machine lubricating oil interruption test. The differential pressure sensor assembly is arranged on the oil supply pump.

[0014] In one or more embodiments of the lubricating oil interruption test method for the squeeze film damper, in step S3, when the test piece is in the lubricating oil interruption state, the differential pressure drops below 0.3 psi.

[0015] In one or more embodiments of the lubricating oil interruption test method for the squeeze film damper, in step S6, when the test piece resumes the stable working state, the differential pressure resumes to the differential pressure in step S2.

[0016] In one or more embodiments of the lubricating oil interruption test method for the squeeze film damper, in step S1, the test device further includes an air flow path, a lubricating oil flow path, and an oil supply flow path. The downstream of the air flow path and the lubricating oil flow path converge on the oil supply flow path. The air flow path is provided with an air valve, and the lubricating oil flow path is provided with a lubricating oil valve. In steps S2 and S5, the air valve is closed, and the lubricating oil valve is opened. The lubricating oil is input into the test piece through the oil supply flow path. In step S3, the air valve is opened, and the lubricating oil valve is closed. Air is input into the test piece through the oil supply flow path.

[0017] In one or more embodiments of the lubricating oil interruption test method for the squeeze film damper, in step S1, the test device further includes a pipeline. The pipeline serves as a carrier for transmitting fluids, and the length of the pipeline is equal to the flow path length in the whole-machine lubricating oil interruption test.

[0018] According to another aspect of the present invention, a lubricating oil interruption test device for a squeeze film damper is used for the lubricating oil interruption test method as described above. The lubricating oil interruption test device is the test device in step S1 of the test method. Description of the Drawings

[0019] The above and other features, properties, and advantages of the present invention will become more apparent from the following description in conjunction with the drawings and embodiments. In the drawings, the same reference numerals always denote the same features. It should be noted that these drawings are only examples and are not drawn according to the condition of equal proportion, and should not be used to limit the actual scope of protection required by the present invention, where:

[0020] Figure 1 It is a lubricating oil interruption test method for an extrusion oil film damper in an embodiment.

[0021] Figure 2 It is a structural schematic diagram of a test device in an embodiment.

[0022] Figure 3 It is a structural schematic diagram of a rotor system and a test piece in an embodiment.

[0023] Figure 4 It is a structural schematic diagram of a signal acquisition and processing system in an embodiment.

[0024] Figure 5 It is a structural schematic diagram of a test piece in an embodiment.

[0025] Reference Numerals:

[0026] 100 - Lubricating oil interruption test method for an extrusion oil film damper;

[0027] 200 - Test device;

[0028] 20 - Differential pressure sensor assembly;

[0029] 201 - Upstream pressure gauge, 202 - Downstream pressure gauge, 203 - Differential pressure gauge;

[0030] 21 - Metal chip sensor;

[0031] 23 - Oil supply pump, 24 - Oil return pump;

[0032] 25 - Pipeline, 26 - Oil tank, 27 - Anti - siphon device;

[0033] 300 - Test piece;

[0034] 31 - Inner ring of the test piece, 32 - Outer ring of the test piece;

[0035] 400 - Rotor system;

[0036] 41 - Rotor, 42 - Support, 43 - Inner frame, 44 - Outer frame, 45 - Bearing, 46 - Bolt;

[0037] 500 - Signal acquisition and processing system;

[0038] 51 - Exciter, 52 - Force sensor, 53 - Displacement sensor, 54 - Signal generator, 55 - Power amplifier, 56 - Signal receiver, 57 - Data analysis tool;

[0039] 61 - Air flow path, 62 - Lubricating oil flow path, 63 - Oil supply flow path;

[0040] 601 - Air valve, 602 - Lubricating oil valve, 603 - Air gas source. Detailed implementation mode

[0041] Now, various embodiments of the present invention will be described in detail. Examples of these embodiments are shown in the drawings and described as follows. Although the present invention will be described in combination with exemplary embodiments, it should be realized that this specification is not intended to limit the present invention to those exemplary embodiments. On the contrary, the present invention is intended to cover not only these exemplary embodiments, but also various alternative forms, modified forms, equivalent forms and other embodiments that can be included within the spirit and scope of the present invention as defined by the appended claims.

[0042] In the following description, the orientation or positional relationship indicated by terms such as "upstream", "downstream" or other orientation terms is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. "Upstream" and "downstream" are distinguished based on the fluid flow direction. Specifically, the lubricating oil flows from "upstream" to "downstream".

[0043] At the same time, specific words are used in this application to describe the embodiments of this application. Such as "one embodiment" and / or "an embodiment" mean a certain feature, structure or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of this application can be combined appropriately.

[0044] Flowcharts are used in this application to illustrate the operations performed by the systems according to the embodiments of this application. It should be understood that the operations before or below do not necessarily need to be executed precisely in sequence. Other operations can also be added to these processes, or one or several steps of operations can be removed from these processes.

[0045] During the whole-machine lubricating oil interruption test, the vibration value at the key bearing measurement points often becomes too large during the oil interruption stage. At this time, to avoid damaging the engine and ensure safety, the methods of quickly reducing the speed or immediately restoring the oil supply are usually adopted to ensure the test safety, but this also means the failure of the test. The reason for the test failure often focuses on the reduction of the equivalent damping caused by the rupture of the SFD oil film, resulting in the rotor vibration value exceeding the limit. Moreover, in the design process of the SFD, attention is paid to the performance of the equivalent damping. In addition to the structural design, factors such as the oil supply quantity, the number of oil supply holes, and the position of the oil supply holes are generally concerned about the lubricating oil angle, but the investigation of the SFD equivalent damping under special conditions (such as the oil film rupture caused by the lubricating oil interruption) is lacking.

[0046] Based on the above considerations, through in-depth research, the inventor designed a lubricating oil interruption test method for squeeze film dampers, which can separately monitor and analyze the changes of various parameters of the SFD under the lubricating oil interruption state, study the performance changes of the SFD during the whole process of the lubricating oil interruption test, provide data support for the design of the SFD, and provide risk guidance for the whole-machine lubricating oil interruption test.

[0047] Reference Figures 1 to 4 As shown, in one embodiment, the specific steps of the lubricating oil interruption test method 100 for squeeze film dampers may include:

[0048] S1. Build the test device 200 and install the test piece 300 on the test device; the "test piece 300" here is the squeeze film damper.

[0049] S2. Supply oil to the test piece 300 to make the test piece 300 in a stable working state, measure the performance parameters of the test piece 300, and obtain the first set of data; the "stable working state" here refers to the working state where the lubricating oil supply of the aero-engine is normal.

[0050] S3. Cut off the oil supply to the test piece 300, wait until the test piece 300 is in the lubricating oil interruption state, and record the time T0.

[0051] S4. Continuously measure the performance parameters of the test piece 300 to obtain the second set of data.

[0052] S5. After the time reaches T0 + 15s, restore the oil supply to the test piece 300, continuously measure the performance parameters of the test piece 300, and obtain the third set of data.

[0053] S6. Wait until the test piece 300 returns to the stable working state, record the time T1, measure the performance parameters of the test piece 300, and obtain the fourth set of data.

[0054] S7. Analyze the first group of data, the second group of data, the third group of data, and the fourth group of data. That is, the first group of data is for the normal fuel supply state before T0, the second group of data is for the lubricating oil interruption state in the interval from T0 to (T0 + 15S), the third group of data is for the lubricating oil restored fuel supply state in the interval from (T0 + 15S) to T1, and the fourth group of data is for the state after the lubricating oil restores normal fuel supply after T1. Analyze the SFD performance parameters measured in the four time intervals.

[0055] The beneficial effect of such a setting is that it can separately monitor and analyze the SFD to study the changes of various parameters under the lubricating oil interruption state, and study the performance changes of the SFD during the whole process of the lubricating oil interruption test, providing data support for the design of the SFD and risk guidance for the whole machine lubricating oil interruption test.

[0056] Reference Figures 1 to 3 As shown, in one embodiment, the specific steps of the lubricating oil interruption test method 100 for the squeeze film damper may further be that in step S1, the test device 200 includes a rotor system 400, and the test piece 300 is installed on the rotor system 400. In step S2, increase the rotational speed of the rotor system 400 to the normal operating speed to drive the test piece 300 to rotate so that the test piece 300 is in a stable operating state. The "normal operating speed" here refers to the rotational speed of the rotor when the aero-engine is in a normal fuel supply operating state.

[0057] In one embodiment, as Figure 3 shown, the rotor system 400 includes a rotor 41, a support 42, an inner frame 43, an outer frame 44, a bearing 45, and a bolt 46. The inner frame 43 and the outer frame 44 are fixed to the support by bolts. The test piece 300 includes an inner ring 31 and an outer ring 32. The inner ring 31 is sleeved on the rotating shaft 41 and is located within the space defined by the inner frame 43, and the outer ring 32 is located within the space defined by the inner frame 43 and the outer frame 44.

[0058] Reference Figures 1 to 5 As shown, in one embodiment, the specific steps of the lubricating oil interruption test method 100 for the squeeze film damper may further be that in step S1, the test device 200 further includes a signal acquisition and processing system 500. The signal acquisition and processing system 500 is connected to the test piece 300. The signal acquisition and processing system 500 includes an exciter 51, a force sensor 52, and a displacement sensor 53. The force sensor 52 and the displacement sensor 53 are arranged on the test piece 300. The exciter 51 is connected to the force sensor 53 and provides an exciting force. In steps S2, S4, S5, and S6, the performance parameters of the test piece 300 include the exciting force and the displacement response. The force sensor 52 measures the exciting force, and the displacement sensor 53 measures the displacement response.

[0059] Specifically, as Figure 4As shown, the signal acquisition and processing system 500 includes a signal generator 54, a power amplifier 55, an exciter 51, a force sensor 52, a displacement sensor 53, a signal receiver 56, and a data analysis tool 57. The signal generator 54 emits a signal, which is transmitted to the exciter 51 through the power amplifier 55. The exciter 51 is connected to the force sensor 52 through a push rod to provide an exciting force. The force sensor 52 and the displacement sensor 53 measure the exciting force and the displacement response, and transmit them to the data analysis tool 57 through the signal receiver 56 to calculate the equivalent damping of the test piece 300. The data analysis tool 57 can be a program or software stored in a computer system to automatically execute the calculation and analysis function. In one embodiment, as Figure 5 shown, displacement sensors 53 are arranged at the -45-degree and +45-degree angular positions on the inner ring 31 of the test piece 300, and force sensors 52 are arranged at the -135-degree and +135-degree angular positions corresponding thereto. The force sensor 52 is connected to the exciter 51.

[0060] Referring to Figure 1 in combination with Figure 2 shown, in one embodiment, the specific steps of the lubricating oil interruption test method 100 for the squeeze film damper may further be that in step S1, the test device 200 further includes a differential pressure sensor assembly 20 and a metal chip sensor 21. The differential pressure sensor assembly is arranged upstream of the test piece 300, and the metal chip sensor 21 is arranged downstream of the test piece 300; in steps S2, S4, S5, and S6, the performance parameters of the test piece 300 further include changes in differential pressure and metal chip content. The differential pressure sensor assembly 20 measures the differential pressure, and the metal chip sensor 21 measures the change in metal chip content.

[0061] The test device 200 further includes an oil supply pump 23. The oil supply pump 23 is fluidly connected upstream of the test piece 300 to pressurize the pressure of the lubricating oil input to the test piece 300 to the lubricating oil pressure entering the squeeze film damper in the whole machine lubricating oil interruption test to simulate the real environment in the whole machine. The differential pressure sensor assembly 20 is provided on the oil supply pump 23. The differential pressure sensor assembly 20 includes an upstream pressure gauge 201, a downstream pressure gauge 202, and a differential pressure gauge 203. The upstream pressure gauge 201 is arranged upstream of the oil supply pump 23, the downstream pressure gauge 202 is arranged downstream of the oil supply pump 23, and the differential pressure gauge 203 is located between the upstream pressure gauge 201 and the downstream pressure gauge 202 to display the differential pressure. In one embodiment, the test device 200 further includes a pipeline 25. The pipeline 25 serves as a carrier for transmitting fluid, and the length of the pipeline 25 is equal to the flow path length in the whole machine lubricating oil interruption test, further making the lubricating oil interruption test environment of the squeeze film damper the same as that of the whole machine lubricating oil interruption test.

[0062] The test device 200 further includes an oil tank 26 and an oil return pump 24. The oil tank 26 is arranged upstream of the oil supply pump 23, and the oil return pump 24 is arranged downstream of the test piece 300 to transport the lubricating oil back to the oil tank 26. The metal chip sensor 21 is arranged downstream of the oil return pump 24. An anti-siphon device 27 is provided between the oil tank 26 and the oil supply pump 23.

[0063] In step S3, when the differential pressure gauge 203 measures that the differential pressure drops below 0.3 psi, it is determined that the test piece 300 is in a lubricating oil interruption state.

[0064] In step S6, when the differential pressure gauge 203 measures that the differential pressure returns to the differential pressure in step S2, it is determined that the test piece 300 resumes a stable working state.

[0065] Continue to refer to Figure 1 Combined with Figure 2 As shown, in one embodiment, the specific steps of the lubricating oil interruption test method 100 for the squeeze film damper may further be that in step S1, the test device 200 further includes an air flow path 61, a lubricating oil flow path 62, and an oil supply flow path 63. The downstream of the air flow path 61 and the lubricating oil flow path 62 converge on the oil supply flow path 63. An air valve 601 is provided in the air flow path 61, and a lubricating oil valve 602 is provided in the lubricating oil flow path 62; in steps S2 and S5, the air valve 601 is closed, and the lubricating oil valve 602 is opened, and the lubricating oil is input into the test piece 300 through the oil supply flow path 63; in step S3, the air valve 601 is opened, and the lubricating oil valve 602 is closed, and air is input into the test piece 300 through the oil supply flow path 63 to simulate the lubricating oil interruption state. The upstream of the air flow path 61 is fluidly connected to the air gas source 603 to provide stable and sufficient input air.

[0066] Refer to Figures 1 to 5 As shown, in one embodiment, the lubricating oil interruption test device for the squeeze film damper used in the lubricating oil interruption test method for the squeeze film damper as described above is the test device 200 in step S1. This test device is built efficiently and conveniently, with low cost, flexible disassembly, replacement, and adjustment of components, establishing a complete SFD lubricating oil system flow path, and can simulate the whole machine lubricating oil interruption test environment. By arranging various types of sensors, it is possible to monitor the supply oil pressure before and after oil interruption, the SFD damping force, and the change in the metal chip content in the circuit of the SFD alone, and identify in advance the performance changes of the SFD affected by oil interruption. The test results can provide data support for the SFD design and the whole machine test.

[0067] Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, all modifications, equivalent changes and decorations made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for testing the oil interruption of a squeeze film damper, characterized in that: include: S1. Build a test device and install the test piece in the test device; S2. supplying oil to the test piece so that the test piece is in a stable working state, measuring the performance parameters of the test piece, and obtaining a first set of data; S3. Cut off the oil supply to the test piece, and wait until the test piece is in the oil interruption state, and time T0; S4. Continuously measure the performance parameters of the test piece to obtain a second set of data; S5. After the timing reaches T0+15s, the oil supply to the test piece is resumed, and the performance parameters of the test piece are continuously measured to obtain a third set of data; S6. After the test piece returns to the stable working state, timing T1 is performed, and the performance parameters of the test piece are measured to obtain a fourth set of data; S7. Analyze the first set of data, the second set of data, the third set of data, and the fourth set of data.

2. The oil interruption test method for a squeeze film damper according to claim 1, characterized in that: In step S1, the test device includes a rotor system, and the test piece is installed in the rotor system; in step S2, the rotation speed of the rotor system is increased to a normal working speed, driving the test piece to rotate, so that the test piece is in the stable working state.

3. The oil interruption test method for a squeeze film damper according to claim 1, characterized in that: In the step S1, the test device further includes a signal acquisition and processing system, the signal acquisition and processing system is connected to the test piece, the signal acquisition and processing system includes an exciter, a force sensor, and a displacement sensor, the force sensor and the displacement sensor are arranged on the test piece, and the exciter is connected to the force sensor and provides an exciting force; In the steps S2, S4, S5 and S6, the performance parameters of the test piece include an exciting force and a displacement response, the force sensor measures the exciting force, and the displacement sensor measures the displacement response.

4. The oil interruption test method for a squeeze film damper according to claim 3, characterized in that: In step S1, the test device also includes a differential pressure sensor assembly and a metal chip sensor, the differential pressure sensor assembly is arranged upstream of the test piece, and the metal chip sensor is arranged downstream of the test piece; in steps S2, S4, S5, and S6, the performance parameters of the test piece also include pressure difference and metal chip content changes, the differential pressure sensor assembly measures the pressure difference, and the metal chip sensor measures the metal chip content changes.

5. The oil interruption test method for a squeeze film damper according to claim 4, characterized in that: In step S1, the test device also includes an oil supply pump, and the oil supply pump fluid is connected to the upstream of the test piece to pressurize the pressure of the lubricating oil input into the test piece to the lubricating oil pressure entering the squeeze film damper in the whole machine lubricating oil interruption test, and the differential pressure sensor assembly is arranged on the oil supply pump.

6. The oil interruption test method for a squeeze film damper according to claim 5, characterized in that: In the step S3, when the test piece is in the lubricating oil interruption state, the pressure difference drops below 0.3 psi.

7. The oil interruption test method for a squeeze film damper according to claim 5, characterized in that: In the step S6, when the test piece returns to the stable working state, the pressure difference returns to the pressure difference in the step S2.

8. The oil interruption test method for a squeeze film damper according to claim 1, characterized in that: In the step S1, the test device further includes an air flow path, a lubricating oil flow path and an oil supply flow path, the air flow path and the downstream of the lubricating oil flow path converge at the oil supply flow path, the air flow path is provided with an air valve, and the lubricating oil flow path is provided with a lubricating oil valve; in the steps S2 and S5, the air valve is closed, the lubricating oil valve is opened, and the lubricating oil is input into the test piece through the oil supply flow path; in the step S3, the air valve is opened, the lubricating oil valve is closed, and air is input into the test piece through the oil supply flow path.

9. The oil interruption test method for a squeeze film damper according to claim 1, characterized in that: In the step S1, the test device further includes a pipeline, the pipeline serves as a carrier for transmitting the fluid, and the length of the pipeline is equal to the flow path length in the whole machine lubricating oil interruption test.

10. An oil interruption test device for a squeeze film damper, characterized in that: Used in the lubricating oil interruption test method according to any one of claims 1 to 9, the lubricating oil interruption test device is the test device in step S1 of the test method.

Images