A method and device for evaluating the damping effect of an aero-engine squeeze film damper

Abstract

This application belongs to the field of engine design technology, specifically relating to a method and apparatus for evaluating the vibration reduction effect of an aero-engine extrusion film damper. The method includes: firstly, acquiring rotor vibration data in the initial equilibrium and unbalanced states when assembling the extrusion film damper and process oil distribution sleeve, and calculating the unbalance sensitivity of the damper; then, acquiring vibration data in the initial equilibrium and unbalanced states when only the process oil distribution sleeve is installed, and determining the unbalance sensitivity in the original state; finally, comparing the difference between the two sensitivities to quantify the damper's vibration reduction performance. This application can accurately and efficiently test and evaluate the vibration reduction effect of the spring-loaded damper, is easy to implement in engineering, and saves costs.

Description

Technical Field

[0001] This application belongs to the field of engine design technology, specifically relating to a method and device for evaluating the vibration reduction effect of an aero-engine squeeze oil film damper. Background Technology

[0002] To ensure inherently superior vibration characteristics in engines, the common practice is to employ rotor support schemes with squirrel-cage elastic supports and squeeze film dampers. The squirrel-cage squeeze film dampers used in aero-engine rotor systems primarily provide radial stiffness and damping. The damper absorbs rotor vibration energy by forming an oil film within the rotor system, utilizing the viscosity and squeezing effect of the oil film, thereby effectively reducing vibration at the rotor's critical speed. During aero-engine design, the effectiveness of the elastic support squeeze film damper needs further verification to determine whether to implement this structure in its structural configuration. Because engine vibration is highly dependent on assembly, and vibration differences between different assembly stages are significant, ensuring assembly consistency is difficult. It is challenging to verify the vibration reduction effect through tests with and without elastic support squeeze film dampers, making the evaluation of the vibration reduction effect of aero-engine squeeze film dampers a major challenge.

[0003] Currently available publicly available information has yielded relatively in-depth research on the structural characteristics, oil film models, and simulation analyses of squeeze film dampers. Regarding vibration reduction effects, most studies have verified these effects using simple rotor testing equipment in laboratories. However, there is a lack of practical engineering research on solutions to actual vibration problems in aero-engines and the design and vibration reduction effects of squeeze film dampers. For engines, large overall vibration is one of the key issues affecting engine testing and operation. Installing spring-loaded squeeze film dampers at the support points can effectively reduce vibration, but accurately evaluating the effectiveness of spring-loaded dampers under full-engine conditions is difficult. Comparative testing in laboratory rotor testing equipment, creating two states (with and without dampers), is not feasible for engines. Firstly, disassembling and reassembling the entire engine before testing is too costly. Secondly, ensuring consistency of key parameters such as rotor imbalance across different assemblies is difficult, significantly impacting the accuracy of test results. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a method and apparatus for evaluating the vibration reduction effect of an aero-engine extrusion oil film damper, effectively verifying the vibration reduction effect of the aero-engine extrusion oil film damper and providing support for determining whether to implement the spring-supported extrusion oil film damper structure.

[0005] The first aspect of this application provides a method for evaluating the vibration reduction effect of an aero-engine squeeze film damper, mainly including:

[0006] Step S1: Obtain the first rotor vibration response when the engine is assembled with the extrusion oil film damper and the process oil distribution sleeve, and the process oil distribution sleeve is in the initial assembly equilibrium state.

[0007] Step S2: Obtain the vibration response of the second rotor when the engine is assembled with an extrusion oil film damper and a process oil distribution sleeve, and the process oil distribution sleeve is in an unbalanced state.

[0008] Step S3: Determine the unbalance sensitivity with damper based on the vibration response of the first rotor and the vibration response of the second rotor;

[0009] Step S4: Obtain the third rotor vibration response when the engine is only equipped with the process oil distribution sleeve and the process oil distribution sleeve is in the initial assembly equilibrium state.

[0010] Step S5: Obtain the vibration response of the fourth rotor when the engine is only equipped with the process oil distribution sleeve and the process oil distribution sleeve is in an unbalanced state.

[0011] Step S6: Determine the imbalance sensitivity of the original state based on the vibration response of the third rotor and the vibration response of the fourth rotor;

[0012] Step S7: Determine the damper's vibration reduction effect based on the imbalance sensitivity of the damper and the imbalance sensitivity of the original state.

[0013] Preferably, the process oil distribution sleeve is configured such that the inner ring is connected to the rotor, and the outer ring has multiple mounting grooves along the circumference. By installing one or more test weights at different positions along the circumference of the outer ring, the process oil distribution sleeve is made to be in an unbalanced state.

[0014] Preferably, the rotor vibration response includes the vibration amplitude and phase of the rotor across the entire speed range.

[0015] Preferably, step S7 further includes:

[0016] Step S71: Determine the difference between the unbalance sensitivity of the damped device and the unbalance sensitivity of the original state;

[0017] Step S72: Determine the ratio of the difference to the imbalance sensitivity of the original state;

[0018] Step S73: Determine the damper's vibration reduction effect based on the relationship between the ratio and the threshold.

[0019] The second aspect of this application provides a device for evaluating the vibration reduction effect of an aero-engine squeeze film damper, mainly comprising:

[0020] The first rotor vibration response acquisition module is used to acquire the first rotor vibration response when the engine is assembled with the extrusion oil film damper and the process oil distribution sleeve, and the process oil distribution sleeve is in the initial assembly equilibrium state.

[0021] The second rotor vibration response acquisition module is used to acquire the second rotor vibration response when the engine is assembled with an extrusion oil film damper and a process oil distribution sleeve, and the process oil distribution sleeve is in an unbalanced state.

[0022] The unbalance sensitivity calculation module with damper is used to determine the unbalance sensitivity with damper based on the vibration response of the first rotor and the vibration response of the second rotor.

[0023] The third rotor vibration response acquisition module is used to acquire the third rotor vibration response when the engine is only equipped with the process oil distribution sleeve and the process oil distribution sleeve is in the initial assembly equilibrium state.

[0024] The fourth rotor vibration response acquisition module is used to acquire the vibration response of the fourth rotor when the engine is only equipped with the process oil distribution sleeve and the process oil distribution sleeve is in an unbalanced state.

[0025] The original state imbalance sensitivity calculation module is used to determine the original state imbalance sensitivity based on the vibration response of the third rotor and the vibration response of the fourth rotor.

[0026] The damper vibration reduction effect determination module is used to determine the damper vibration reduction effect based on the unbalance sensitivity of the damper and the unbalance sensitivity of the original state.

[0027] Preferably, the process oil distribution sleeve is configured such that the inner ring is connected to the rotor, and the outer ring has multiple mounting grooves along the circumference. By installing one or more test weights at different positions along the circumference of the outer ring, the process oil distribution sleeve is made to be in an unbalanced state.

[0028] Preferably, the rotor vibration response includes the vibration amplitude and phase of the rotor across the entire speed range.

[0029] Preferably, the damper vibration reduction effect determination module includes:

[0030] The difference calculation unit is used to determine the difference between the unbalance sensitivity of the damped device and the unbalance sensitivity of the original state.

[0031] A ratio calculation unit is used to determine the ratio of the difference to the imbalance sensitivity of the original state;

[0032] The damper vibration reduction effect classification unit is used to determine the damper vibration reduction effect based on the relationship between the ratio and the threshold.

[0033] This application enables accurate and efficient testing and evaluation of the vibration reduction effect of spring-loaded dampers, is easy to implement in engineering, and saves costs. Attached Figure Description

[0034] Figure 1 This is a flowchart of a preferred embodiment of the method for evaluating the vibration reduction effect of the extrusion oil film damper for aero-engines in this application.

[0035] Figure 2 This is a schematic diagram of the process oil jacket structure. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0037] The first aspect of this application provides a method for evaluating the vibration reduction effect of an aero-engine squeeze film damper, such as... Figure 1 As shown, it mainly includes:

[0038] Step S1: Obtain the first rotor vibration response when the engine is assembled with the extrusion oil film damper and the process oil distribution sleeve, and the process oil distribution sleeve is in the initial assembly equilibrium state.

[0039] Step S2: Obtain the vibration response of the second rotor when the engine is assembled with an extrusion oil film damper and a process oil distribution sleeve, and the process oil distribution sleeve is in an unbalanced state.

[0040] Step S3: Determine the unbalance sensitivity with damper based on the vibration response of the first rotor and the vibration response of the second rotor;

[0041] Step S4: Obtain the third rotor vibration response when the engine is only equipped with the process oil distribution sleeve and the process oil distribution sleeve is in the initial assembly equilibrium state.

[0042] Step S5: Obtain the vibration response of the fourth rotor when the engine is only equipped with the process oil distribution sleeve and the process oil distribution sleeve is in an unbalanced state.

[0043] Step S6: Determine the imbalance sensitivity of the original state based on the vibration response of the third rotor and the vibration response of the fourth rotor;

[0044] Step S7: Determine the damper's vibration reduction effect based on the imbalance sensitivity of the damper and the imbalance sensitivity of the original state.

[0045] This application addresses the current lack of testing and evaluation methods and procedures for the vibration reduction effect of extruded oil film dampers in aero-engines under whole-engine conditions, by introducing an unbalance sensitivity. As a parameter for evaluating vibration reduction effect, the sensitivity to unbalance is... Unbalanced change With response change The ratio, A larger value indicates that the vibration response is less sensitive to the unbalance. Therefore, in step S3 of this application, the unbalance sensitivity S of assembling the squeeze film damper is calculated. 阻尼器 In step S6, the unbalance sensitivity S without the squeeze film damper was calculated. 原状态 In step S7, by comparing S 阻尼器 and S 原状态 To determine the vibration reduction effect of the damper.

[0046] In some alternative embodiments, the process oil distribution sleeve is configured such that the inner ring is connected to the rotor and the outer ring has multiple mounting slots along the circumference. The process oil distribution sleeve is made unbalanced by installing one or more test weights at different positions along the circumference of the outer ring.

[0047] This application, based on the structural characteristics of the engine, improves the design of the oil distributor sleeve structure, enabling imbalance adjustment under the condition of the entire engine. Thus, during engine bench testing in its entirety, the imbalance is adjusted by applying an unbalanced counterweight to the oil distributor sleeve, allowing for the acquisition of vibration responses under different imbalance conditions. Figure 2 As shown, the inner ring of the process oil jacket is connected to the engine rotor, and the outer ring is detachably connected to the test weight, thereby enabling the application of unbalanced test weights at any angle.

[0048] In some alternative implementations, the rotor vibration response includes the amplitude and phase of the rotor vibration across the entire speed range.

[0049] In this embodiment, in steps S1 and S4, a test run is performed to obtain the vibration amplitude and phase within the full speed range under the initial assembly balance state. In steps S2 and S5, the engine is started to obtain the vibration amplitude and phase within the full speed range under the applied unbalance state.

[0050] In some alternative implementations, step S7 further includes:

[0051] Step S71: Determine the difference between the unbalance sensitivity of the damped device and the unbalance sensitivity of the original state;

[0052] Step S72: Determine the ratio of the difference to the imbalance sensitivity of the original state;

[0053] Step S73: Determine the damper's vibration reduction effect based on the relationship between the ratio and the threshold.

[0054] In this embodiment, the variation ratio of the two imbalance sensitivity differences is calculated and compared with a threshold to determine the damping effect of the damper. The threshold may include multiple thresholds to correspond to multiple damping effects. For example, if the ratio exceeds 10%, the damping effect is average, and if the ratio exceeds 20%, the damping effect is significant.

[0055] This application improves the method and process for testing and evaluating the vibration reduction effect of the spring-loaded extrusion film damper in the whole-engine state of an aero-engine. It enables accurate and efficient testing and evaluation of the spring-loaded damper's vibration reduction effect, and is easily implemented in engineering. It avoids the cost losses caused by repeated engine disassembly and reassembly, as well as the impact of changes in engine state parameters after disassembly and reassembly on the evaluation results. It truly achieves accurate evaluation of the spring-loaded damper's vibration reduction effect at the lowest cost in the whole-engine state, providing necessary support for whether the engine has implemented the spring-loaded damper's state and whether the spring-loaded damper structure needs optimization.

[0056] The second aspect of this application provides a device for evaluating the vibration reduction effect of an aero-engine squeeze film damper, corresponding to the above method, mainly comprising:

[0057] The first rotor vibration response acquisition module is used to acquire the first rotor vibration response when the engine is assembled with the extrusion oil film damper and the process oil distribution sleeve, and the process oil distribution sleeve is in the initial assembly equilibrium state.

[0058] The second rotor vibration response acquisition module is used to acquire the second rotor vibration response when the engine is assembled with an extrusion oil film damper and a process oil distribution sleeve, and the process oil distribution sleeve is in an unbalanced state.

[0059] The unbalance sensitivity calculation module with damper is used to determine the unbalance sensitivity with damper based on the vibration response of the first rotor and the vibration response of the second rotor.

[0060] The third rotor vibration response acquisition module is used to acquire the third rotor vibration response when the engine is only equipped with the process oil distribution sleeve and the process oil distribution sleeve is in the initial assembly equilibrium state.

[0061] The fourth rotor vibration response acquisition module is used to acquire the vibration response of the fourth rotor when the engine is only equipped with the process oil distribution sleeve and the process oil distribution sleeve is in an unbalanced state.

[0062] The original state imbalance sensitivity calculation module is used to determine the original state imbalance sensitivity based on the vibration response of the third rotor and the vibration response of the fourth rotor.

[0063] The damper vibration reduction effect determination module is used to determine the damper vibration reduction effect based on the unbalance sensitivity of the damper and the unbalance sensitivity of the original state.

[0064] In some alternative embodiments, the process oil distribution sleeve is configured such that the inner ring is connected to the rotor and the outer ring has multiple mounting slots along the circumference. The process oil distribution sleeve is made unbalanced by installing one or more test weights at different positions along the circumference of the outer ring.

[0065] In some alternative implementations, the rotor vibration response includes the amplitude and phase of the rotor vibration across the entire speed range.

[0066] In some alternative implementations, the damper vibration reduction effect determination module includes:

[0067] The difference calculation unit is used to determine the difference between the unbalance sensitivity of the damped device and the unbalance sensitivity of the original state.

[0068] A ratio calculation unit is used to determine the ratio of the difference to the imbalance sensitivity of the original state;

[0069] The damper vibration reduction effect classification unit is used to determine the damper vibration reduction effect based on the relationship between the ratio and the threshold.

[0070] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for evaluating the vibration reduction effect of an aero-engine squeeze film damper, characterized in that, include: Step S1: Obtain the first rotor vibration response when the engine is assembled with the extrusion oil film damper and the process oil distribution sleeve, and the process oil distribution sleeve is in the initial assembly equilibrium state. Step S2: Obtain the vibration response of the second rotor when the engine is assembled with an extrusion oil film damper and a process oil distribution sleeve, and the process oil distribution sleeve is in an unbalanced state. Step S3: Determine the unbalance sensitivity with damper based on the vibration response of the first rotor and the vibration response of the second rotor; Step S4: Obtain the third rotor vibration response when the engine is only equipped with the process oil distribution sleeve and the process oil distribution sleeve is in the initial assembly equilibrium state. Step S5: Obtain the vibration response of the fourth rotor when the engine is only equipped with the process oil distribution sleeve and the process oil distribution sleeve is in an unbalanced state. Step S6: Determine the imbalance sensitivity of the original state based on the vibration response of the third rotor and the vibration response of the fourth rotor; Step S7: Determine the damper's vibration reduction effect based on the imbalance sensitivity of the damper and the imbalance sensitivity of the original state.

2. The method for evaluating the vibration reduction effect of the aero-engine squeeze film damper according to claim 1, characterized in that, The process oil distribution sleeve is configured such that the inner ring is connected to the rotor, and the outer ring has multiple mounting grooves along the circumference. By installing one or more test weights at different positions along the circumference of the outer ring, the process oil distribution sleeve is made to be in an unbalanced state.

3. The method for evaluating the vibration reduction effect of the aero-engine squeeze film damper according to claim 1, characterized in that, Rotor vibration response includes the vibration amplitude and phase of the rotor across the entire speed range.

4. The method for evaluating the vibration reduction effect of the aero-engine squeeze film damper according to claim 1, characterized in that, Step S7 further includes: Step S71: Determine the difference between the unbalance sensitivity of the damped device and the unbalance sensitivity of the original state; Step S72: Determine the ratio of the difference to the imbalance sensitivity of the original state; Step S73: Determine the damper's vibration reduction effect based on the relationship between the ratio and the threshold.

5. A device for evaluating the vibration reduction effect of an aero-engine squeeze film damper, characterized in that, include: The first rotor vibration response acquisition module is used to acquire the first rotor vibration response when the engine is assembled with the extrusion oil film damper and the process oil distribution sleeve, and the process oil distribution sleeve is in the initial assembly equilibrium state. The second rotor vibration response acquisition module is used to acquire the second rotor vibration response when the engine is assembled with an extrusion oil film damper and a process oil distribution sleeve, and the process oil distribution sleeve is in an unbalanced state. The unbalance sensitivity calculation module with damper is used to determine the unbalance sensitivity with damper based on the vibration response of the first rotor and the vibration response of the second rotor. The third rotor vibration response acquisition module is used to acquire the third rotor vibration response when the engine is only equipped with the process oil distribution sleeve and the process oil distribution sleeve is in the initial assembly equilibrium state. The fourth rotor vibration response acquisition module is used to acquire the vibration response of the fourth rotor when the engine is only equipped with the process oil distribution sleeve and the process oil distribution sleeve is in an unbalanced state. The original state imbalance sensitivity calculation module is used to determine the original state imbalance sensitivity based on the vibration response of the third rotor and the vibration response of the fourth rotor. The damper vibration reduction effect determination module is used to determine the damper vibration reduction effect based on the unbalance sensitivity of the damper and the unbalance sensitivity of the original state.

6. The device for evaluating the vibration reduction effect of an aero-engine extrusion oil film damper according to claim 5, characterized in that, The process oil distribution sleeve is configured such that the inner ring is connected to the rotor, and the outer ring has multiple mounting grooves along the circumference. By installing one or more test weights at different positions along the circumference of the outer ring, the process oil distribution sleeve is made to be in an unbalanced state.

7. The device for evaluating the vibration reduction effect of an aero-engine extrusion oil film damper according to claim 5, characterized in that, Rotor vibration response includes the vibration amplitude and phase of the rotor across the entire speed range.

8. The device for evaluating the vibration reduction effect of an aero-engine extrusion oil film damper according to claim 5, characterized in that, The damper vibration reduction effect determination module includes: The difference calculation unit is used to determine the difference between the unbalance sensitivity of the damped device and the unbalance sensitivity of the original state. A ratio calculation unit is used to determine the ratio of the difference to the imbalance sensitivity of the original state; The damper vibration reduction effect classification unit is used to determine the damper vibration reduction effect based on the relationship between the ratio and the threshold.

Images