Similar simulation design method, experimental platform and simulation method of a rotor system with an elastic ring type squeeze film damper

Abstract

The present invention provides a similarity simulation design method, a test bench and a simulation method for a rotor system with an elastic ring type squeeze film damper. The test bench mainly consists of an electrical control system, a combined support rotor system, an oil supply system, a temperature control system, a sensor test system and a T-shaped groove; the present invention takes into account the dynamic similarity of an aeroengine rotor system, and the scale model established by using the dimensional analysis method and the integral simulation method can reduce the test difficulty and shorten the test cycle, and the dynamic vibration characteristics of the scale model can truly reflect the dynamic vibration characteristics of an aeroengine with an elastic ring type squeeze film damper; the present invention can also set different oil supply temperatures through the temperature control system, conduct similarity simulation tests on the rotor system of the elastic ring type squeeze film damper with a seal, and replace the elastic ring type squeeze film damper with different structural parameters to realize a variety of similarity simulation experiments.

Description

Technical Field

[0001] The present invention belongs to the technical field of structural design and similarity simulation of aero-engine rotor systems, and particularly relates to a similarity simulation design method, a test bench and a simulation method for a rotor system with an elastic-ring squeeze-film damper. Background Art

[0002] As the power guarantee for aviation flight, the reliability of an aero-engine is directly related to the safety performance of aviation flight. The aero-engine rotor system adopts a support structure with an elastic-ring squeeze-film damper to achieve the purpose of high dynamic vibration attenuation and nonlinear suppression. However, due to the complex structure, long development cycle and high test risk of aero-engines, there are many limitations in directly carrying out dynamic characteristic tests on the whole engine. Therefore, the similarity theory is used to design a rotor system with an elastic-ring squeeze-film damper, and its vibration characteristics and nonlinear suppression mechanism are analyzed to reveal the dynamic characteristics of full-scale aero-engines.

[0003] Elastic-ring squeeze-film dampers are widely used in high-overload aero-engine rotor systems (such as the AL-31F engine) due to their advantages of simple design, convenient installation, good vibration reduction effect and strong operability. However, when the rotor system with an elastic-ring squeeze-film damper operates under high temperature, large load and high speed, it may cause nonlinear vibration of the rotor system, which will have a greater impact on aero-engines. At present, scholars at home and abroad have recognized the important influence of elastic-ring squeeze-film dampers on aero-engine rotor systems and have carried out theoretical research in this regard, but there is no perfect theoretical system. At present, most of the rotor systems with elastic-ring squeeze-film dampers in universities and research institutes do not consider the influence of oil film temperature and sealing on the dynamic characteristics of the rotor system, and the structural parameters of elastic-ring squeeze-film dampers will also have a greater impact on the vibration characteristics and nonlinear suppression of the rotor system. Therefore, it is necessary to study the similarity simulation method of the rotor system with an elastic-ring squeeze-film damper to reflect the true dynamics of aero-engine rotor systems. Summary of the Invention

[0004] In view of the above-mentioned technical problems, a similarity simulation design method, a test bench and a simulation method for a rotor system with an elastic-ring squeeze-film damper are provided. The technical means adopted by the present invention are as follows:

[0005] A similarity simulation design method for a rotor system with an elastic ring type squeeze film damper includes the following steps: Based on dimensional analysis and integral simulation methods, study the relationships between various physical quantities of an aeroengine prototype and a to-be-designed scaled model (a rotor system with an elastic ring type squeeze film damper), and design the size parameters of the scaled model system according to similarity criteria. Based on this scaled model, simulate the dynamic vibration characteristics of an aeroengine with an elastic ring type squeeze film damper under different working conditions.

[0006] Further, it specifically includes the following steps:

[0007] Obtain the system data of an aeroengine with an elastic ring type squeeze film damper, and record the size parameters of the aeroengine prototype;

[0008] Based on the parameters of the aeroengine prototype, determine the parameters of the scaled model system for the test using similarity criteria determined by dimensional analysis and integral simulation methods, specifically as follows:

[0009] The shaft vibration equation is:

[0010]

[0011] In the formula, x and y are respectively the length and deflection of the shaft; E is the elastic modulus; m and I are respectively the mass and section modulus; a is the moment of inertia; p(x) is the unbalance force of the system; ω is the rotor speed, where i is the imaginary number.

[0012] The similarity criteria derived by dimensional analysis and integral simulation methods are as follows:

[0013]

[0014] In the formula, π represents the π term, m represents the model data, and p represents the prototype data (engine data); α represents the inclination angle of the elastic line, and σ represents the normal stress;

[0015] The shaft similarity relationship is derived from the similarity ratio as follows:

[0016]

[0017] In the formula, λ represents the similarity ratio, G is the gravity, g is the acceleration due to gravity, ρ and J p are respectively the density and the moment of inertia, d is the diameter,

[0018] l is the length of the shaft.

[0019] Through dimensional analysis, the similarity relationship of the turntable (the similarity relationship between the prototype disk and the model disk) can be obtained as:

[0020] λ m = λ ρ λ d2 λ l

[0021]

[0022] The motion equation of the elastic support is as follows:

[0023]

[0024] Where M0 is the mass of the elastic support, K0 is the support stiffness, and Q is the unbalanced force. According to the integral simulation method, the similarity criteria are as follows:

[0025]

[0026] To satisfy the consistent similarity ratio between the elastic support and the external forces of the system, the similarity relationship of the elastic support is derived as follows:

[0027]

[0028] Determine the size parameters of the combined support according to the support stiffness determined by the similarity criteria, and finally determine the size parameters of the rotor system similarity model with an elastic-ring squeeze film damper. Machine the rotor model for the test, and then conduct a similarity simulation test on the machined rotor system with an elastic-ring squeeze film damper.

[0029] Based on the above rotor system similarity simulation design method with an elastic-ring squeeze film damper, the present invention designs a rotor similarity simulation test bench with an elastic-ring squeeze film damper, which includes a platform and an electrical control system, a combined support rotor system, an oil supply system, a temperature control system, and a sensor test system arranged on the platform; the combined support rotor system includes a rotating shaft, a disk, and a combined support. The input end of the rotating shaft is installed on a rotor frequency conversion motor. The rotating shaft is installed on the combined support. The combined support includes an elastic-ring squeeze film damper, and the sensor test system is arranged between the head combined support and the tail combined support; the electrical control system is connected to the rotor frequency conversion motor and is used to adjust the speed of the rotor frequency conversion motor; the oil supply system is used to supply oil to the elastic-ring squeeze film damper; the temperature control system is used to heat and control the temperature of the lubricating oil in the oil supply system; the sensor test system collects the rotor system vibration signals of the rotor system with an elastic-ring squeeze film damper at various oil film temperatures based on the adjustment of the parameters of the electrical control system, the oil supply system, and the temperature control system to conduct a comparative test on the dynamic characteristics.

[0030] Further, the electrical control system includes an electrical control cabinet installed on the ground, a rotor variable-frequency motor control system, and a motor support for fixing the rotor variable-frequency motor; an electric motor start button, a stop button, an emergency stop button, and a control panel are arranged outside the electrical control cabinet; the rotor variable-frequency motor control system arranged inside includes an inverter, an AC contactor, and a fuse; the start button and the stop button control the start and stop of the rotor variable-frequency motor, and the inverter adjusts the speed of the rotor variable-frequency motor; the rotor variable-frequency motor transmits torque to the combined support rotor system through a flexible coupling; wherein the flexible coupling connects the right end and the left end of the coupling through a nylon rope.

[0031] Further, the combined support includes a bearing end cover, a bearing, an elastic ring, a bearing seat, and a squirrel cage. A bearing is arranged at the front end of the squirrel cage, a bearing end cover is arranged at the front end of the bearing, the squirrel cage is installed in the bearing seat through the elastic ring, and there is a region for lubricating oil between the bearing seat and the elastic ring. This section of the structure constitutes the elastic-ring type squeeze film damper. The bearing seat is fixed to the combined support seat through bolts; the disc is fixed to the rotating shaft through a shrink disc.

[0032] Further, a sealing system is also included. The sealing system consists of two groups of sealing rings and is installed at the sealing groove between the squirrel cage and the bearing seat. Comparative tests of the rotor system with and without a seal are carried out based on whether the sealing rings are installed. Since only the sealing rings are replaced, the test cost is saved.

[0033] Further, the above-mentioned rotor system with an elastic-ring type squeeze film damper realizes comparative experiments on rotor systems with elastic-ring type squeeze film dampers of different structural parameters by replacing the elastic-ring type squeeze film dampers with different structural parameters, so as to analyze the influence of structural parameters on the dynamic characteristics of the rotor system with an elastic-ring type squeeze film damper.

[0034] Further, multiple anchor bolts are installed on the base for fixing the motor support, the combined support seat, and the sensor support.

[0035] Further, the sensor test system consists of a sensor support fixed to the base, an eddy current sensor fixed to the sensor support, a vibration test acquisition device, a power amplifier, and an LMS vibration test device.

[0036] Further, the LMS vibration test device is used for dynamic vibration tests such as testing the shaft center trajectory, time-domain response, frequency response curve, and waterfall plot of the rotor system; the power amplifier and the LMS vibration test device are used for data acquisition, are respectively connected to the eddy current sensors in the horizontal and vertical directions, and transmit the data to the vibration test acquisition device.

[0037] Based on the above-mentioned rotor similarity simulation test bench with an elastic-ring type squeeze film damper, the present invention conducts various simulation test methods, including similarity simulation tests of the rotor system with an elastic-ring type squeeze film damper at different oil supply temperatures, similarity simulation tests of the rotor system with an elastic-ring type squeeze film damper with a seal, and similarity simulation tests of the rotor system with an elastic-ring type squeeze film damper under different structural parameters.

[0038] Further, the similarity simulation test of the rotor system with an elastic-ring type squeeze film damper at different oil supply temperatures includes the following steps:

[0039] Start the oil supply system to supply oil to the elastic-ring type squeeze film damper, and arrange eddy current displacement sensors in the vertical and horizontal directions of the disc of the rotor similarity simulation test bench with an elastic-ring type squeeze film damper. Start the temperature control system and set three groups of different oil supply temperatures, namely high, medium, and low, for oil supply. Start the rotor frequency conversion motor using the electrical control system, collect data within the full speed range and transmit the data to the vibration test acquisition device. By processing the data, finally obtain the shaft center trajectory, time-domain response, frequency response curve, and waterfall diagram dynamic vibration characteristics of the rotor system at different oil supply temperatures. Compare the dynamic vibration characteristics at different temperatures and analyze the influence of different oil supply temperatures on the dynamic vibration characteristics of the rotor system with an elastic-ring type squeeze film damper.

[0040] Further, the similarity simulation test of the rotor system with an elastic-ring type squeeze film damper with a seal includes the following steps:

[0041] Start the rotor frequency conversion motor using the electrical control system, obtain the vibration data of the rotor similarity test bench within the full speed range in the unsealed state under normal temperature conditions and transmit the data to the vibration test acquisition device, and obtain the shaft center trajectory, time-domain response, frequency response curve, and waterfall diagram dynamic vibration characteristics of the rotor system in the unsealed state;

[0042] Install two groups of sealing rings at the combined support respectively, and conduct vibration tests on the rotor similarity test bench within the full speed range in the sealed state under normal temperature conditions at the same position while arranging eddy current displacement sensors. Obtain the shaft center trajectory, time-domain response, frequency response curve, and waterfall diagram dynamic vibration characteristics of the rotor system in the sealed state. Compare the dynamic vibration characteristics of the rotor system with and without a seal and analyze the influence of the seal on the dynamic vibration characteristics of the rotor system with an elastic-ring type squeeze film damper.

[0043] Further, the similarity simulation test of the rotor system with an elastic-ring type squeeze film damper under different structural parameters includes the following steps:

[0044] Start the rotor variable-frequency motor, and obtain the vibration data of the rotor similarity simulation test bench in the unsealed state within the full speed range under normal temperature conditions through an eddy current displacement sensor. Replace two groups of elastic ring type squeeze film dampers with different structural parameters, and obtain the vibration data of the rotor similarity simulation test bench within the full speed range under different structural parameters. Process the vibration data through a vibration test acquisition device, and finally obtain the shaft center trajectories, time-domain responses, frequency response curves, and waterfall diagram dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper under three different structural parameters. Compare the dynamic vibration characteristics of the rotor system under different structural parameters of the elastic ring type squeeze film damper, and analyze the influence of the structural parameters of the elastic ring type squeeze film damper on the dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper.

[0045] Compared with the existing rotor system with an elastic ring type squeeze film damper, the present invention considers the dynamic similarity of the aero-engine rotor system. The scale model established by the dimensional analysis method and the integral simulation method can reduce the test difficulty and shorten the test cycle, and the dynamic vibration characteristics of the scale model can truly reflect the dynamic vibration characteristics of the aero-engine with an elastic ring type squeeze film damper; the present invention can also set different oil supply temperatures through a temperature control system, so as to realize the similarity simulation test research of the rotor system with an elastic ring type squeeze film damper under different oil supply temperatures, and can also conduct similarity simulation comparison tests of sealed and unsealed rotor systems without reprocessing and manufacturing the rotor system, saving test costs; on this basis, further change the structural parameters of the elastic ring type squeeze film damper, and analyze the influence of the structural parameters on the dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper. Brief Description of the Drawings

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0047] Figure 1 It is a schematic diagram of the system composition of the similarity simulation test bench of the present invention;

[0048] Figure 2 It is a schematic diagram of the structure of the rotor similarity simulation test bench with an elastic ring type squeeze film damper of the present invention;

[0049] Figure 3 It is a schematic diagram of the disc structure of the present invention;

[0050] Figure 4 It is a schematic diagram of the combined support structure of the present invention;

[0051] Figure 5 Schematic diagram of the bearing housing structure of the present invention;

[0052] Figure 6 Schematic diagram of the bearing end cover structure of the present invention;

[0053] Figure 7 Schematic diagram of the squirrel cage structure of the present invention;

[0054] Figure 8 Schematic diagram of the elastic ring structure of the present invention;

[0055] Figure 9 Schematic diagram of the structure of the electrical control cabinet of the present invention;

[0056] Figure 10 Schematic diagram of the oil supply system structure of the present invention;

[0057] Figure 11 Schematic diagram of the temperature control system structure of the present invention;

[0058] Figure 12 Schematic diagram of the flexible coupling structure of the present invention;

[0059] Figure 13 Schematic diagram of the sensor test system structure of the present invention.

[0060] In the figure: 1. Electrical control cabinet; 2. Temperature control system; 3. Oil supply system; 4. Base; 5. Combined support; 6. Rotating shaft; 7. Disc; 8. Sensor test system; 9. Combined support support; 10. Flexible coupling; 11. Motor support; 12. Rotor frequency conversion motor; 13. Expansion sleeve; 14. Bearing end cover; 15. Bearing; 16. Elastic ring; 17. Sealing ring; 18. Bearing housing; 19. Squirrel cage; 20. Control panel; 21. Stop button; 22. Emergency stop button; 23. Start button; 24. Oil injection pump; 25. Oil supply tank; 26. Temperature control switch; 27. Temperature indicator light; 28. Temperature control panel; 29. Right end of the coupling; 30. Nylon rope; 31. Left end of the coupling; 32. Eddy current sensor; 33. Sensor bracket. Detailed implementation manners

[0061] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0062] Such as Figure 1 ,2 As shown in the figure, an embodiment of the present invention discloses a rotor similarity simulation test bench with an elastic ring type squeeze film damper, which studies the relationship between physical quantities of an aero-engine prototype and a scaled model based on dimensional analysis and integral simulation methods, deduces the similarity criteria of the system, and determines the structural parameters of the disc 7, the rotating shaft 6, the bearing end cover 14, the bearing 15, the elastic ring 16, the sealing ring 17, the bearing housing 18, the squirrel cage 19, and the combined support bracket 9 in the scaled model system for the test. Specifically as follows:

[0063] A similarity simulation design method for a rotor system with an elastic ring type squeeze film damper includes the following steps: studying the relationship between physical quantities of an aero-engine prototype and a to-be-designed scaled model (a rotor system with an elastic ring type squeeze film damper) based on dimensional analysis and integral simulation methods, designing the size parameters of the scaled model system according to the similarity criteria, and simulating the dynamic vibration characteristics of an aero-engine with an elastic ring type squeeze film damper under different working conditions based on this scaled model.

[0064] Specifically, it includes the following steps:

[0065] Obtain the system data of an aero-engine with an elastic ring type squeeze film damper, and record the size parameters of the aero-engine prototype;

[0066] Based on the parameters of the aero-engine prototype, determine the parameters of the scaled model system for the test according to the similarity criteria determined by dimensional analysis and integral simulation methods. Specifically as follows:

[0067] The vibration equation of the rotating shaft is:

[0068]

[0069] In the formula, x and y are respectively the length and deflection of the rotating shaft; E is the elastic modulus; m and I are respectively the mass and the sectional moment; a is the moment of inertia; p(x) is the unbalanced force of the system; ω is the rotational speed of the rotor.

[0070] The similarity criteria deduced by dimensional analysis and integral simulation methods are as follows:

[0071]

[0072] The similarity relationship of the rotating shaft deduced from the similarity ratio is as follows:

[0073]

[0074] In the formula, G is the gravity, g is the acceleration due to gravity, ρ and J p are respectively the density and the moment of inertia, and d is the diameter.

[0075] Through dimensional analysis, the similarity relationship of the turntable can be obtained as:

[0076] λ m = λ ρ λ d 2 λ l

[0077]

[0078] The motion equation of the elastic support is as follows:

[0079]

[0080] Where M0 is the mass of the elastic support, K0 is the support stiffness, and Q is the unbalanced force. According to the integral simulation method, the similarity criteria are as follows:

[0081]

[0082] To satisfy the consistent similarity ratio between the elastic support and the external forces of the system, the similarity relationship of the elastic support is derived as:

[0083]

[0084] According to the support stiffness determined by the similarity criteria, determine the dimensional parameters of the combined support, and finally determine the dimensional parameters of the rotor system similarity model with an elastic ring type squeeze film damper. Machine the rotor model for the test, and then conduct a similarity simulation test on the machined rotor system with an elastic ring type squeeze film damper.

[0085] The rotor similarity simulation test bench with an elastic ring type squeeze film damper includes a platform and an electrical control system, a combined support rotor system, an oil supply system 2, a temperature control system 3, and a sensor test system 8 arranged on the platform. In this embodiment, a T-shaped groove 4 is provided on the platform; the combined support rotor system includes a rotating shaft 6, a disk 7, and a combined support 5. The input end of the rotating shaft 6 is installed on the rotor frequency conversion motor 12. The rotating shaft 6 is installed on the combined support 5. The combined support 5 includes an elastic ring type squeeze film damper, and the sensor test system 8 is arranged between the head combined support 5 and the tail combined support 5; the electrical control system is connected to the rotor frequency conversion motor 12 and is used to adjust the rotation speed of the rotor frequency conversion motor 12; the oil supply system 3 is used to supply oil to the elastic ring type squeeze film damper; the temperature control system 2 is used to heat and control the temperature of the lubricating oil in the oil supply system 3; the sensor test system 8 collects the rotor system vibration signals of the rotor system with an elastic ring type squeeze film damper at various oil film temperatures based on the adjustment of the parameters of the electrical control system, the oil supply system 3, and the temperature control system 2 to conduct a comparative test on the dynamic characteristics.

[0086] The electrical control system includes Figure 9The electrical control cabinet 1 installed on the ground, the rotor variable-frequency motor 12 controlled by the servo drive system, and the motor support 11 for fixing the motor; the motor start button 23, stop button 21, emergency stop button 22, and control panel 20 are arranged outside the electrical control cabinet; a rotor variable-frequency motor control system is arranged inside, including an inverter, AC contactor, and fuse; the start and stop buttons control the start and stop of the rotor variable-frequency motor, and the inverter adjusts the speed of the rotor variable-frequency motor; the rotor variable-frequency motor 12 is fixed on the motor support 11 and transmits torque to Figure 12 the combined support rotor system shown through Figure 4 the flexible coupling 10 shown; where the flexible coupling connects the right end 29 and the left end 31 of the coupling through a nylon rope 30;

[0087] The combined support rotor system mainly consists of a rotating shaft 6, Figure 3 the disk 7 shown, and the combined support 5; the combined support mainly consists of Figure 6 the bearing end cover 14, bearing 15 shown, Figure 8 the elastic ring 16, sealing ring 17 shown, Figure 5 the bearing seat 18 shown, and Figure 7 the squirrel cage 19 shown, where the combined support is fixed on the combined support seat 9 through bolts; the disk is fixed on the rotating shaft through a shrink disc 13. In this embodiment, a plurality of strip-shaped holes are evenly distributed along the axial direction in the middle of the squirrel cage and are set as required based on the strength requirements of the device.

[0088] As Figure 10 shown, the oil supply system mainly consists of an injection oil pump 24 and an oil supply tank 25 and is used for supplying oil to the elastic ring type squeeze film damper; as Figure 11 shown, the temperature control system mainly includes a temperature switch 26, temperature indicator light 27, and temperature control panel 28, and can heat and control the temperature of the lubricating oil in the oil supply system. It is used to realize the comparative test of the dynamic characteristics of the rotor system with an elastic ring type squeeze film damper under various oil film temperatures.

[0089] As Figure 4 shown, the sealing system consists of two groups of sealing rings and can be installed at the sealing groove between the squirrel cage and the bearing seat, and is used to carry out the comparative test of the rotor system with an elastic ring type squeeze film damper with and without sealing. Since only the sealing ring is replaced, the test cost is saved.

[0090] Furthermore, the above-mentioned rotor system with an elastic ring type squeeze film damper realizes the similarity simulation experiment of the rotor system with an elastic ring type squeeze film damper with different structural parameters by replacing the elastic ring type squeeze film dampers with different structural parameters;

[0091] Multiple anchor bolts are installed on the T-shaped groove 4 for fixing the motor support 11, the combined support support 9, and the sensor bracket 33;

[0092] As Figure 13 shown, the sensor test system consists of a sensor bracket 33 fixed on the T-shaped groove, an eddy current sensor 32 fixed on the sensor bracket, a vibration test acquisition device, a power amplifier, and an LMS vibration test device, and is used to collect the vibration signals of the rotor system;

[0093] The LMS vibration test device is used for dynamic vibration tests such as the shaft center trajectory, time domain response, frequency response curve, and waterfall plot of the rotor system; the power amplifier and the LMS vibration test device are used to collect data, are respectively connected to the eddy current sensors 32 in the horizontal and vertical directions, and transmit the data to the vibration test acquisition device;

[0094] The similarity simulation method of the rotor system with an elastic ring type squeeze film damper is used to carry out the similarity simulation test of the rotor system with an elastic ring type squeeze film damper under different working conditions, specifically as follows:

[0095] 1) Similarity simulation test method of the rotor system with an elastic ring type squeeze film damper at different oil supply temperatures

[0096] Start the oil supply system to supply oil to the elastic ring type squeeze film damper, and arrange the eddy current displacement sensors in the vertical and horizontal directions of the disc of the similarity simulation test bench of the rotor with an elastic ring type squeeze film damper. Start the temperature control system and set three groups of different oil supply temperatures, high, medium, and low, for oil supply. Start the rotor frequency conversion motor using the electrical control system, collect data within the full speed range, and transmit the data to the vibration test acquisition device. By processing the data, finally obtain the shaft center trajectory, time domain response, frequency response curve, and waterfall plot dynamic vibration characteristics of the rotor system at different oil supply temperatures. Compare the dynamic vibration characteristics at different temperatures and analyze the influence of different oil supply temperatures on the dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper.

[0097] 2) Similarity simulation test method of the rotor system with a sealed elastic ring type squeeze film damper

[0098] Start the rotor variable-frequency motor with an electrical control system, obtain the vibration data of the rotor similarity simulation test bench within the full speed range in the unsealed state under normal temperature conditions, and transmit the data to the vibration test acquisition device to obtain the shaft center trajectory, time-domain response, frequency response curve, and waterfall plot dynamic vibration characteristics of the rotor system in the unsealed state. Install two groups of sealing rings at the combined support respectively, and arrange eddy current displacement sensors at the same position to conduct vibration tests on the rotor similarity simulation test bench within the full speed range in the sealed state under normal temperature conditions. Obtain the shaft center trajectory, time-domain response, frequency response curve, and waterfall plot dynamic vibration characteristics of the rotor system in the sealed state. Compare the dynamic vibration characteristics of the rotor system with and without sealing, and analyze the influence of sealing on the dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper.

[0099] 3) Similar simulation test method for the rotor system with an elastic ring type squeeze film damper under different structural parameters

[0100] Start the rotor variable-frequency motor, and obtain the vibration data of the rotor similarity simulation test bench within the full speed range in the unsealed state under normal temperature conditions through eddy current displacement sensors. Replace two groups of elastic ring type squeeze film dampers with different structural parameters to obtain the vibration data of the rotor similarity simulation test bench within the full speed range under different structural parameters. Process the vibration data through the vibration test acquisition device to finally obtain the shaft center trajectory, time-domain response, frequency response curve, and waterfall plot dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper under three different structural parameters. Compare the dynamic vibration characteristics of the rotor system under different structural parameters of the elastic ring type squeeze film damper, and analyze the influence of the structural parameters of the elastic ring type squeeze film damper on the dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper.

[0101] Based on the above similarity simulation method, the main focus of the present invention is to study the changes in the dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper in view of the structural characteristics of the aero-engine rotor system. The following describes various working conditions that the present invention can achieve:

[0102] The main changes in the test working conditions are as follows: The temperature control system can adjust and control the oil film temperature, so that similarity simulation comparison tests of the rotor system with an elastic ring type squeeze film damper at different oil film temperatures can be carried out; The presence or absence of the sealing system can conduct similarity simulation comparison tests of the rotor system with an elastic ring type squeeze film damper under sealed and unsealed conditions; At the same time, the structural parameters of the elastic ring type squeeze film damper can be further changed to analyze the influence of the structural parameters on the dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A rotor system similarity simulation test bench with an elastic ring type squeeze film damper, characterized in that, It includes a platform and an electrical control system, a combined support rotor system, an oil supply system, a temperature control system, and a sensor test system arranged on the platform; the combined support rotor system includes a rotating shaft, a disc, and a combined support. The input end of the rotating shaft is installed on a rotor frequency conversion motor. The rotating shaft is installed on the combined support. The combined support includes an elastic ring type squeeze film damper. The sensor test system is arranged between the head combined support and the tail combined support; the electrical control system is connected to the rotor frequency conversion motor and is used to adjust the speed of the rotor frequency conversion motor; the oil supply system is used to supply oil to the elastic ring type squeeze film damper; the temperature control system is used to heat and control the temperature of the lubricating oil in the oil supply system; the sensor test system collects the rotor system vibration signals of the rotor system with an elastic ring type squeeze film damper at various oil film temperatures based on the adjustment of the parameters of the electrical control system, the oil supply system, and the temperature control system to conduct a comparative test on dynamic characteristics. The combined support includes a bearing end cover, a bearing, an elastic ring, a bearing seat, and a squirrel cage. A bearing is arranged at the front end of the squirrel cage, and a bearing end cover is arranged at the front end of the bearing. The squirrel cage is installed in the bearing seat through the elastic ring. There is a region for lubricating oil between the bearing seat and the elastic ring. This section of the structure constitutes the elastic ring type squeeze film damper. The bearing seat is fixed to the combined support support through bolts; the disc is fixed to the rotating shaft through a shrink disc. There is also a sealing system. The sealing system consists of two groups of sealing rings and is installed at the sealing groove between the squirrel cage and the bearing seat. A comparative test on the rotor system with and without a seal of the elastic ring type squeeze film damper is carried out based on whether the sealing rings are installed.

2. The rotor system similarity simulation test bench with an elastic ring type squeeze film damper according to claim 1, characterized in that The electrical control system includes an electrical control cabinet installed on the ground, a rotor frequency conversion motor control system, and a motor support for fixing the rotor frequency conversion motor; motor start buttons, stop buttons, emergency stop buttons, and a control panel are arranged outside the electrical control cabinet; the rotor frequency conversion motor control system arranged inside includes a frequency converter, an AC contactor, and a fuse; the start and stop of the rotor frequency conversion motor are controlled by the start button and the stop button, and the speed of the rotor frequency conversion motor is adjusted by the frequency converter; the rotor frequency conversion motor transmits torque to the combined support rotor system through a flexible coupling; among them, the flexible coupling connects the right end and the left end of the coupling through a nylon rope.

3. A rotor system similarity simulation test bench with an elastic ring type squeeze film damper according to claim 1, characterized in that, The sensor test system includes a sensor support and a plurality of eddy current sensors, a vibration test acquisition device, a power amplifier, and an LMS vibration test device fixed on the sensor support. The LMS vibration test device is used for dynamic vibration tests of the rotor system's shaft center trajectory, time domain response, frequency response curve, and waterfall plot; the power amplifier and the LMS vibration test device are used for data acquisition, are respectively connected to the eddy current sensors in the horizontal and vertical directions, and transmit the data to the vibration test acquisition device.

4. The simulation test method of a rotor system similarity simulation test bench with an elastic ring type squeeze film damper according to any one of claims 1 to 3, characterized in that, It includes similarity simulation tests of the rotor system with an elastic ring type squeeze film damper at different oil supply temperatures, similarity simulation tests of the rotor system with a sealed elastic ring type squeeze film damper, and similarity simulation tests of the rotor system with an elastic ring type squeeze film damper under different structural parameters.

5. The method according to claim 4, wherein The similarity simulation test of the rotor system with an elastic ring type squeeze film damper at different oil supply temperatures includes the following steps: Start the oil supply system to supply oil to the elastic ring type squeeze film damper, and arrange eddy current displacement sensors in the vertical and horizontal directions of the disk of the rotor similarity simulation test bench with an elastic ring type squeeze film damper; Start the temperature control system, and set three groups of different oil supply temperatures, namely high, medium, and low, for oil supply; Start the rotor frequency conversion motor using the electrical control system, collect data within the full speed range and transmit the data to the vibration test acquisition device. By processing the data, finally obtain the shaft center trajectory, time domain response, frequency response curve, and waterfall diagram dynamic vibration characteristics of the rotor system at different oil supply temperatures; Compare the dynamic vibration characteristics at different temperatures, and analyze the influence of different oil supply temperatures on the dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper.

6. The method according to claim 4, wherein The similarity simulation test of the rotor system with a sealed elastic ring type squeeze film damper includes the following steps: Start the rotor frequency conversion motor using the electrical control system, obtain the vibration data of the rotor similarity test bench within the full speed range in the unsealed state under normal temperature conditions and transmit the data to the vibration test acquisition device, and obtain the shaft center trajectory, time domain response, frequency response curve, and waterfall diagram dynamic vibration characteristics of the rotor system in the unsealed state; Install two groups of sealing rings at the combined support respectively, and conduct vibration tests on the rotor similarity test bench within the full speed range in the sealed state under normal temperature conditions at the same position, and arrange eddy current displacement sensors. Obtain the shaft center trajectory, time domain response, frequency response curve, and waterfall diagram dynamic vibration characteristics of the rotor system in the sealed state; Compare the dynamic vibration characteristics of the rotor system with and without sealing, and analyze the influence of sealing on the dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper.

7. The method according to claim 4, wherein The similarity simulation test of the rotor system with an elastic ring type squeeze film damper under different structural parameters includes the following steps: Start the rotor frequency conversion motor, and obtain the vibration data of the rotor similarity simulation test bench within the full speed range in the unsealed state under normal temperature conditions through eddy current displacement sensors; Replace two groups of elastic ring type squeeze film dampers with different structural parameters to obtain the vibration data of the rotor similarity simulation test bench within the full speed range under different structural parameters; Process the vibration data through the vibration test acquisition device, and finally obtain the shaft center trajectory, time domain response, frequency response curve, and waterfall diagram dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper under three groups of different structural parameters; Compare the dynamic vibration characteristics of the rotor system under different structural parameters of the elastic ring type squeeze film damper, and analyze the influence of the structural parameters of the elastic ring type squeeze film damper on the dynamic vibration characteristics of the rotor system with an elastic ring type squeeze film damper.

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