CN115876451A - Simulation design method, experiment table and simulation method for rotor system with elastic ring type squeeze film damper - Google Patents
Simulation design method, experiment table and simulation method for rotor system with elastic ring type squeeze film damper Download PDFInfo
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Abstract
The invention provides a design method, an experiment table and a simulation method for simulation of a rotor system with an elastic ring type squeeze film damper. The test bed mainly comprises an electrical control system, a combined supporting rotor system, an oil supply system, a temperature control system, a sensor testing system and a T-shaped groove; the dynamic similarity of an aircraft engine rotor system is considered, the test difficulty can be reduced by adopting a reduced scale model established by a dimensional analysis method and an integral simulation method, the test period can be shortened, and the dynamic vibration characteristic of the reduced scale model can truly reflect the dynamic vibration characteristic of the aircraft engine with the elastic ring type squeeze film damper; the invention can also set different oil supply temperatures through the temperature control system, carry out similar simulation tests on the rotor system of the elastic ring type squeeze film damper with the seal, and replace the elastic ring type squeeze film damper with different structural parameters, so as to realize various similar simulation experiments.
Description
Technical Field
The invention belongs to the technical field of structural design and analog simulation of an aircraft engine rotor system, and particularly relates to a rotor system analog simulation design method with an elastic ring type squeeze film damper, an experiment table and a simulation method.
Background
The aero-engine is used for ensuring the power of the aero-flight, and the working reliability of the aero-engine is directly related to the safety performance of the aero-flight. An aeroengine rotor system adopts an elastic ring type squeeze oil film damper supporting structure so as to achieve the purposes of high dynamic vibration attenuation and nonlinear suppression. However, as the aero-engine has a complex structure, a long development period and a large test risk, there are many limitations in directly carrying out a dynamic characteristic test on the whole engine. Therefore, a rotor system with an elastic ring type squeeze film damper is designed by adopting a similar theory, and the vibration characteristic and the nonlinear inhibition mechanism of the rotor system are analyzed to reveal the dynamic characteristic of the full-size aircraft engine.
The elastic ring type squeeze film damper has the advantages of simple design, convenience in installation, good damping effect, strong operability and the like, and is widely applied to high-overload aeroengine rotor systems (such as AL-31F engines). However, the rotor system with the elastic ring type squeeze film damper may generate nonlinear vibration under the operating state of high temperature, large load and high rotating speed, and further has great influence on the aircraft engine. At present, scholars at home and abroad recognize the important influence of the elastic ring type squeeze film damper on an aircraft engine rotor system and carry out theoretical research on relevant aspects, but a complete theoretical system is not provided. At present, most of rotor systems with elastic ring type squeeze film dampers in colleges and universities and scientific research institutions do not consider the influence of oil film temperature and sealing on the dynamic characteristics of rotor systems, and the structural parameters of the elastic ring type squeeze film dampers also have great influence on the vibration characteristics and nonlinear inhibition of the rotor systems. Therefore, research on a rotor system simulation method with an elastic ring type squeeze film damper is needed to reflect the dynamic real situation of the rotor system of the aircraft engine.
Disclosure of Invention
In light of the technical problems, a simulation design method, an experiment table and a simulation method for a rotor system with an elastic ring type squeeze film damper are provided. The technical means adopted by the invention are as follows:
a design method for simulating rotor system similarity of a damper with an elastic ring type squeeze oil film comprises the following steps: the method comprises the steps of researching the relation between an aero-engine prototype and each physical quantity of a reduced scale model (a rotor system with an elastic ring type squeeze film damper) to be designed based on a dimensional analysis method and an integral simulation method, designing the size parameters of the reduced scale model system according to a similarity criterion, and simulating the dynamic vibration characteristics of the aero-engine with the elastic ring type squeeze film damper under different working conditions based on the reduced scale model.
Further, the method specifically comprises the following steps:
acquiring system data of an aeroengine with an elastic ring type squeeze film damper, and recording the size parameters of an aeroengine prototype;
based on the parameters of the prototype of the aircraft engine, the parameters of the reduced scale model system for the test are determined by adopting a similarity criterion determined by a dimensional analysis method and an integral simulation method, and the parameters are as follows:
the vibration equation of the rotating shaft is as follows:
wherein x and y are respectively the length and deflection of the rotating shaft; e is the modulus of elasticity; m and I are respectively mass and section distance; a is rotational inertia; p (x) is the imbalance force of the system; ω is the rotor speed, where i is an imaginary number.
The similarity criterion derived from dimensional analysis and integral simulation is as follows:
in the formula, π represents π term, m represents model data, and p represents prototype data (engine data); alpha represents the elastic line inclination angle, and sigma represents the normal stress;
the similarity relation of the rotating shafts is derived from the similarity ratio as follows:
wherein λ represents the similarity ratio, G is gravity, G is the acceleration of gravity, ρ and J p Density and moment of inertia, respectively, d is the diameter,
l is the length of the rotating shaft.
Through a dimensional analysis method, the similarity relationship of the turntable (the similarity relationship between the prototype disc and the model disc) can be obtained as follows:
λ m ＝λ ρ λ d 2 λ l
the equation of motion for the resilient support is:
in the formula M 0 For elastically supporting the masses, K 0 For support stiffness, Q is the unbalanced force, and a similarity criterion can be found from integral modeling as follows:
in order to satisfy the consistent similarity ratio of the elastic support and the acting force outside the system, the similarity relationship of the elastic support is deduced as follows:
and determining the size parameters of the combined support according to the support stiffness determined by the similarity criterion, finally determining the size parameters of the similar model of the rotor system with the elastic ring type squeeze film damper, processing and manufacturing the rotor model for the test, and then performing the similar simulation test on the processed rotor system with the elastic ring type squeeze film damper.
The invention designs a rotor analog simulation test bed with an elastic ring type squeeze film damper based on the rotor system analog simulation design method with the elastic ring type squeeze film damper, which comprises a platform, and an electric control system, a combined supporting rotor system, an oil supply system, a temperature control system and a sensor test system which are arranged on the platform; the combined support rotor system comprises a rotating shaft, a disc and a combined support, wherein the input end of the rotating shaft is arranged on the rotor variable frequency motor, the rotating shaft is arranged on the combined support, the combined support comprises an elastic ring type squeeze film damper, and the sensor testing system is arranged between the end combined support and the end tail combined support; the electric control system is connected with the rotor variable frequency motor and is used for adjusting the rotating speed of the rotor variable frequency motor; the oil supply system is used for supplying oil to the elastic ring type squeeze film damper; the temperature control system is used for heating and controlling the temperature of the lubricating oil in the oil supply system; the sensor testing system collects rotor system vibration signals of the rotor system with the elastic ring type squeeze film damper under various oil film temperatures based on the adjustment of parameters of the electric control system, the oil supply system and the temperature control system so as to perform a dynamic characteristic comparison test.
Further, the electrical control system comprises an electrical control cabinet arranged on the ground, a rotor variable frequency motor control system and a motor support used for fixing the rotor variable frequency motor; a motor starting button, a stopping button, an emergency stopping button and a control panel are arranged outside the electric control cabinet; the rotor variable frequency motor control system arranged inside the motor comprises a frequency converter, an alternating current contactor and a fuse protector; the start button and the stop button control the start and stop of the rotor variable-frequency motor, and the frequency converter regulates the rotating speed of the rotor variable-frequency motor; the rotor variable frequency motor transmits torque to the combined supporting rotor system through the flexible coupling; wherein the right end of the flexible coupling is connected with the left end of the coupling through a nylon rope.
Furthermore, the combined support comprises a bearing end cover, a bearing, an elastic ring, a bearing seat and a squirrel cage, wherein the bearing is arranged at the front end of the squirrel cage, the 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, a region through lubricating oil exists between the bearing seat and the elastic ring, the elastic ring type squeeze oil film damper is formed by the structure of the section, and the bearing seat is fixed on the combined support through a bolt; the disc is fixed on the rotating shaft through the expansion sleeve.
And furthermore, the test device also comprises a sealing system, wherein the sealing system consists of two groups of sealing rings, is arranged at a sealing groove between the squirrel cage and the bearing seat, and is used for carrying out a comparison test of sealing and non-sealing of the rotor system with the elastic ring type squeeze film damper based on whether the sealing rings are arranged or not.
Furthermore, the rotor system with the elastic ring type squeeze film damper realizes comparison experiments of rotor systems with elastic ring type squeeze film dampers with different structural parameters by replacing elastic ring type squeeze film dampers with different structural parameters, so that the influence of the structural parameters on the dynamic characteristics of the rotor system with the elastic ring type squeeze film damper is analyzed.
Furthermore, a plurality of foundation bolts are installed on the base and used for fixing the motor support, the combined supporting support and the sensor support.
Furthermore, the sensor testing system is composed of a sensor support fixed on the base, an eddy current sensor fixed on the sensor support, a vibration testing and collecting device, a power amplifier and an LMS vibration testing device.
Furthermore, the LMS vibration testing device is used for testing dynamic vibration tests such as an axis track, a time domain response, a frequency response curve, a waterfall graph and the like of the rotor system; the power amplifier and the LMS vibration testing device are used for collecting data, are respectively connected with the eddy current sensors in the horizontal direction and the vertical direction, and transmit the data to the vibration testing and collecting device.
The invention carries out a plurality of simulation test methods based on the rotor simulation test bed with the elastic ring type squeeze film damper, and comprises simulation tests of rotor systems with the elastic ring type squeeze film damper at different oil supply temperatures, simulation tests of rotor systems with the sealed elastic ring type squeeze film damper, and simulation tests of rotor systems with the elastic ring type squeeze film damper under different structural parameters.
Further, the simulation test of the rotor system of the squeeze film damper with the elastic ring at different oil supply temperatures comprises the following steps:
and starting an oil supply system to supply oil to the elastic ring type squeeze film damper, and arranging the eddy current displacement sensor in the vertical and horizontal directions of a disc of a rotor analog simulation test bed with the elastic ring type squeeze film damper. And starting a temperature control system, and setting three groups of different oil supply temperatures, namely a high group, a medium group and a low group, respectively, for supplying oil. An electrical control system is adopted to start the rotor variable frequency motor, data are collected in a full rotating speed range and transmitted to a vibration test collection device, and finally the axle center track, time domain response, frequency response curve and waterfall chart dynamic vibration characteristics of the rotating subsystem at different oil supply temperatures are obtained by processing the data. And analyzing and obtaining the influence of different oil supply temperatures on the dynamic vibration characteristic of the rotor system of the elastic ring type squeeze film damper by comparing the dynamic vibration characteristics at different temperatures.
Further, the similar simulation test of the elastic ring type squeeze oil film damper rotor system with the seal comprises the following steps:
starting a rotor variable frequency motor by adopting an electrical control system, acquiring vibration data of the rotor similar test bed in a full rotation speed range in an unsealed state at normal temperature, transmitting the vibration data to a vibration test acquisition device, and acquiring an axis track, a time domain response, a frequency response curve and a waterfall diagram dynamic vibration characteristic of a rotor system in the unsealed state;
and respectively installing the two groups of sealing rings to the combined supporting position, and arranging eddy current displacement sensors at the same positions to perform vibration test tests on the rotor similarity test bed in the full rotating speed range in a sealing state under the normal temperature condition. And obtaining the axial center track, time domain response, frequency response curve and dynamic vibration characteristics of a waterfall chart of the sub-system in a sealing state. And analyzing the influence of the seal on the dynamic vibration characteristic of the rotor system of the elastic ring type squeeze oil film damper compared with the dynamic vibration characteristic of the rotor system with or without the seal.
Further, the similar simulation test of the elastic ring type squeeze film damper rotor system under different structural parameters comprises the following steps:
and starting the rotor variable frequency motor, and acquiring vibration data of the rotor analog simulation test bed in a full rotation speed range in an unsealed state at normal temperature by using the eddy current displacement sensor. And replacing two groups of elastic ring type squeeze film dampers with different structural parameters to obtain vibration data of the rotor analog simulation test bed in the full rotating speed range under different structural parameters. And processing the vibration data through a vibration test acquisition device to finally obtain the dynamic vibration characteristics of the axis track, the time domain response, the frequency response curve and the waterfall diagram of the rotor system with the elastic ring type squeeze film damper under three groups of different structural parameters. And comparing the dynamic vibration characteristics of the sub-conversion systems under the structural parameters of different elastic ring type squeeze film dampers, and analyzing the influence of the structural parameters of the elastic ring type squeeze film dampers on the dynamic vibration characteristics of the rotor system of the elastic ring type squeeze film dampers.
Compared with the existing rotor system with the elastic ring type squeeze film damper, the dynamic similarity of the rotor system of the aircraft engine is considered, the reduced scale model established by adopting a dimensional analysis method and an integral simulation method can reduce the test difficulty and shorten the test period, and the dynamic vibration characteristic of the reduced scale model can truly reflect the dynamic vibration characteristic of the aircraft engine with the elastic ring type squeeze film damper; the invention can also set different oil supply temperatures through the temperature control system, thereby realizing the research of similar simulation tests of the rotor system with the elastic ring type squeeze film damper under different oil supply temperatures, and also carrying out similar simulation comparison tests with and without a sealed rotor system without reworking and manufacturing the rotor system, thereby saving the test cost; on the basis, structural parameters of the elastic ring type squeeze film damper are further changed, and the influence of the structural parameters on the dynamic vibration characteristics of a rotor system of the elastic ring type squeeze film damper is analyzed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of the system components of a simulation modeling experiment table according to the present invention;
FIG. 2 is a schematic structural diagram of a simulation modeling test bed for a rotor of a squeeze film damper with an elastic ring according to the present invention;
FIG. 3 is a schematic view of a disk structure of the present invention;
FIG. 4 is a schematic view of the modular support structure of the present invention;
FIG. 5 is a schematic view of a bearing seat structure according to the present invention;
FIG. 6 is a schematic view of a bearing end cap structure according to the present invention;
FIG. 7 is a schematic diagram of the squirrel cage configuration of the present invention;
FIG. 8 is a schematic diagram of an elastic loop structure according to the present invention;
FIG. 9 is a schematic structural diagram of the electrical control cabinet of the present invention;
FIG. 10 is a schematic view of the oil supply system of the present invention;
FIG. 11 is a schematic structural view of a temperature control system according to the present invention;
FIG. 12 is a schematic view of a flexible coupling construction of the present invention;
fig. 13 is a schematic structural diagram of a sensor testing system according to the present invention.
In the figure: 1. an electrical control cabinet; 2. a temperature control system; 3. an oil supply system; 4. a base; 5. a combined support; 6, rotating the shaft; 7. a disc; 8. a sensor testing system; 9. a combined supporting seat; 10. a flexible coupling; 11. a motor support; 12. a rotor variable frequency motor; 13. expanding and tightening the sleeve; 14. a bearing end cap; 15. a bearing; 16. an elastic ring; 17, sealing rings; 18. a bearing seat; 19. a mouse cage; 20. a control panel; 21. a stop button; 22. an emergency stop button; a start button; 24. an oil injection pump; 25. an oil supply tank; 26. a temperature control switch; 27. a temperature indicating lamp; 28. a temperature control panel; 29. the right end of the coupling; 30. a nylon cord; 31. the left end of the coupling; 32. an eddy current sensor; a sensor holder.
Detailed Description
In order to make the objects, 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 drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1 and 2, the embodiment of the invention discloses a rotor similarity simulation test bed with an elastic ring type squeeze oil film damper, which is used for researching the relation between the physical quantities of an aero-engine prototype and a reduced scale model based on a dimensional analysis method and an integral simulation method, deducing the similarity criterion of the system, and determining the structural parameters of a disc 7, a rotating shaft 6, a bearing end cover 14, a bearing 15, an elastic ring 16, a sealing ring 17, a bearing seat 18, a squirrel cage 19 and a combined supporting support 9 in a reduced scale model system for testing. The method comprises the following specific steps:
a design method for simulating rotor system with elastic ring type squeeze film damper includes the following steps: the method comprises the steps of researching the relation between an aero-engine prototype and each physical quantity of a reduced scale model (a rotor system with an elastic ring type squeeze oil film damper) to be designed based on a dimensional analysis method and an integral simulation method, designing size parameters of the reduced scale model system according to a similarity criterion, and simulating the dynamic vibration characteristics of the aero-engine with the elastic ring type squeeze oil film damper under different working conditions based on the reduced scale model.
The method specifically comprises the following steps:
acquiring system data of an aero-engine with an elastic ring type squeeze oil film damper, and recording the dimensional parameters of an aero-engine prototype;
based on the parameters of the prototype of the aircraft engine, the parameters of the reduced scale model system for the test are determined by adopting a similarity criterion determined by a dimensional analysis method and an integral simulation method, and the parameters are as follows:
the vibration equation of the rotating shaft is as follows:
wherein x and y are respectively the length and deflection of the rotating shaft; e is the modulus of elasticity; m and I are respectively mass and section distance; a is the moment of inertia; p (x) is the unbalanced force of the system; and omega is the rotating speed of the rotor.
The similarity criterion derived from dimensional analysis and integral simulation is as follows:
the similarity relation of the rotating shafts is derived from the similarity ratio as follows:
wherein G is gravity, G is acceleration of gravity, ρ and J p Density and moment of inertia, respectively, and d is the diameter.
Through a dimensional analysis method, the similar relation of the turnplate can be obtained as follows:
λ m ＝λ ρ λ d 2 λ l
the equation of motion for the resilient support is:
in the formula M 0 For elastically supporting masses, K 0 For support stiffness, Q is the unbalanced force, and a similarity criterion can be found from integral modeling as follows:
in order to satisfy the consistent similarity ratio of the elastic support and the acting force outside the system, the similarity relationship of the elastic support is deduced as follows:
and determining the size parameters of the combined support according to the support stiffness determined by the similarity criterion, finally determining the size parameters of the similar model of the rotor system with the elastic ring type squeeze film damper, processing and manufacturing the rotor model for the test, and then performing the similar simulation test on the processed rotor system with the elastic ring type squeeze film damper.
The rotor analog simulation test bed with the elastic ring type squeeze film damper comprises a platform, and an electric control system, a combined supporting rotor system, an oil supply system 2, a temperature control system 3 and a sensor test system 8 which are arranged on the platform, wherein in the embodiment, a T-shaped groove 4 is formed in the platform; the combined supporting rotor system comprises a rotating shaft 6, a disc 7 and a combined support 5, wherein the input end of the rotating shaft 6 is installed on a rotor variable frequency motor 12, the rotating shaft 6 is installed on the combined support 5, the combined support 5 comprises an elastic ring type squeeze oil film damper, and the sensor testing system 8 is arranged between the end combined support 5 and the end tail combined support 5; the electric control system is connected with the rotor variable frequency motor 12 and is used for adjusting the rotating speed of the rotor variable frequency motor 12; the oil supply system 3 is used for supplying oil to the elastic ring type squeeze film damper; the temperature control system 2 is used for heating and controlling the temperature of the lubricating oil in the oil supply system 3; the sensor testing system 8 collects rotor system vibration signals of the rotor system with the elastic ring type squeeze film damper under various oil film temperatures based on the adjustment of parameters of the electric control system, the oil supply system 3 and the temperature control system 2 so as to perform a comparison test of dynamic characteristics.
The electrical control system comprises an electrical control cabinet 1 which is arranged on the ground and is shown in figure 9, a rotor variable frequency motor 12 which is controlled by a servo drive system and a motor support 11 for fixing the motor; a motor starting button 23, a stopping button 21, an emergency stopping button 22 and a control panel 20 are arranged outside the electric control cabinet; a rotor variable frequency motor control system is arranged in the motor control system and comprises a frequency converter, an alternating current contactor and a fuse protector; the start and stop buttons control the start and stop of the rotor variable frequency motor, and the frequency converter adjusts the rotating speed of the rotor variable frequency motor; the rotor variable frequency motor 12 is fixed on the motor support 11, and transmits torque to the combined supporting rotor system shown in fig. 4 through the flexible coupling 10 shown in fig. 12; wherein the right end 29 of the coupler is connected with the left end 31 of the coupler through a nylon rope 30 by the flexible coupler;
the combined supporting rotor system mainly comprises a rotating shaft 6, a disc 7 shown in figure 3 and a combined support 5; the combined support mainly comprises a bearing end cover 14 shown in fig. 6, a bearing 15, an elastic ring 16 shown in fig. 8, a sealing ring 17, a bearing seat 18 shown in fig. 5 and a squirrel cage 19 shown in fig. 7, wherein the combined support is fixed on a combined support 9 through bolts; the disc is fixed in the pivot through the tight cover 13 that expands, in this embodiment, squirrel cage middle part is equipped with along a plurality of bar holes of axial equipartition, sets up as required based on the intensity demand of device.
As shown in fig. 10, the oil supply system mainly comprises an oil filling pump 24 and an oil supply tank 25, and is used for supplying oil to the elastic ring type squeeze film damper; as shown in fig. 11, the temperature control system mainly includes a temperature switch 26, a temperature indicator lamp 27 and a temperature control panel 28, and can heat and control the temperature of the lubricating oil in the oil supply system. The method is used for realizing the comparison test of the dynamic characteristics of the rotor system of the squeeze film damper with the elastic ring at various oil film temperatures.
As shown in fig. 4, the sealing system is composed of two groups of sealing rings, can be installed at a sealing groove between a squirrel cage and a bearing seat and is used for carrying out a comparison test of sealing and non-sealing of the rotor system with the elastic ring type squeeze film damper.
Furthermore, the rotor system with the elastic ring type squeeze film damper realizes similar simulation experiments of the rotor system with the elastic ring type squeeze film damper with different structural parameters by replacing the elastic ring type squeeze film damper with different structural parameters;
a plurality of foundation bolts are arranged on the T-shaped groove 4 and used for fixing the motor support 11, the combined support 9 and the sensor support 33;
as shown in fig. 13, the sensor testing system is composed 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 testing device, and is configured to acquire a vibration signal of the rotor system;
the LMS vibration testing device is used for testing dynamic vibration tests such as an axis track, a time domain response, a frequency response curve, a waterfall graph and the like of the rotor system; the power amplifier and the LMS vibration test device are used for collecting data, are respectively connected with the eddy current sensors 32 in the horizontal direction and the vertical direction, and transmit the data to the vibration test collection device;
a simulation modeling method for a rotor system with an elastic ring type squeeze film damper is used for carrying out simulation modeling tests of the rotor system with the elastic ring type squeeze film damper under different working conditions, and comprises the following steps:
1) Similar simulation test method for rotor system with elastic ring type squeeze film damper under different oil supply temperatures
And starting an oil supply system to supply oil to the elastic ring type squeeze film damper, and arranging the eddy current displacement sensor in the vertical and horizontal directions of a disc of the simulation test bed with the elastic ring type squeeze film damper rotor. And starting a temperature control system, and respectively setting three groups of different oil supply temperatures, namely high, medium and low, for oil supply. An electric control system is adopted to start the rotor variable frequency motor, data are collected in a full rotating speed range and transmitted to a vibration test collection device, and finally the axle center track, time domain response, frequency response curve and waterfall graph dynamic vibration characteristics of the rotating subsystem at different oil supply temperatures are obtained by processing the data. And analyzing the influence of different oil supply temperatures on the dynamic vibration characteristic of the rotor system of the elastic ring type squeeze film damper by comparing the dynamic vibration characteristics at different temperatures.
2) Similar simulation test method for elastic ring type squeeze film damper rotor system with seal
An electric control system is adopted to start a rotor variable frequency motor, vibration data of the rotor analog simulation test bed in a full rotation speed range in an unsealed state are obtained at normal temperature, the data are transmitted to a vibration test acquisition device, and the axial center track, time domain response, frequency response curve and waterfall diagram dynamic vibration characteristics of the rotor system in the unsealed state are obtained. And respectively installing the two groups of sealing rings to the combined supporting position, and arranging eddy current displacement sensors at the same positions to perform vibration test on the rotor similarity simulation test bed in the full rotating speed range in a sealing state under the normal temperature condition. And obtaining the axial center track, time domain response, frequency response curve and dynamic vibration characteristics of a waterfall chart of the sub-system in a sealing state. And analyzing the influence of the seal on the dynamic vibration characteristic of the rotor system of the elastic ring type squeeze oil film damper by comparing the dynamic vibration characteristic of the rotor system with or without the seal.
3) Similar simulation test method for elastic ring type squeeze oil film damper rotor system under different structural parameters
And starting the rotor variable frequency motor, and acquiring vibration data of the rotor analog simulation test bed in a full rotation speed range in an unsealed state at normal temperature by using the eddy current displacement sensor. And replacing two groups of elastic ring type squeeze film dampers with different structural parameters to obtain vibration data of the rotor similarity simulation test bed in the full rotating speed range under different structural parameters. And processing the vibration data through a vibration test acquisition device to finally obtain the dynamic vibration characteristics of the axis track, the time domain response, the frequency response curve and the waterfall diagram of the rotor system with the elastic ring type squeeze film damper under three groups of different structural parameters. And comparing the dynamic vibration characteristics of the sub-conversion systems under the structural parameters of different elastic ring type squeeze film dampers, and analyzing the influence of the structural parameters of the elastic ring type squeeze film dampers on the dynamic vibration characteristics of the rotor system of the elastic ring type squeeze film dampers.
Based on the similar simulation method, the invention mainly aims at the structural characteristics of the rotor system of the aircraft engine, researches the change of the dynamic vibration characteristic of the rotor system of the damper with the elastic ring type squeeze film, and explains various working conditions which can be realized by the invention as follows:
the main test condition changes are as follows: the temperature control system can adjust and control the oil film temperature, so that similar simulation comparison tests of the rotor system with the elastic ring type squeeze oil film damper with different oil film temperatures can be performed; the existence of the sealing system can be used for carrying out a similar simulation comparison test on the rotor system with the elastic ring type squeeze film damper under the conditions of sealing and no sealing; meanwhile, the structural parameters of the elastic ring type squeeze film damper can be further changed, and the influence of the structural parameters on the dynamic vibration characteristics of the rotor system of the elastic ring type squeeze film damper is analyzed.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A design method for simulating rotor system similarity with elastic ring type squeeze film damper is characterized by comprising the following steps: the method comprises the steps of researching the relation between an aero-engine prototype and each physical quantity of a to-be-designed reduced scale model based on a dimensional analysis method and an integral simulation method, designing size parameters of a reduced scale model system according to a similarity criterion, and simulating the dynamic vibration characteristics of the aero-engine with the elastic ring type squeeze film damper under different working conditions based on the reduced scale model.
2. The method for designing the rotor system with the elastic ring type squeeze oil film damper according to claim 1 through the similarity simulation comprises the following steps:
acquiring system data of an aeroengine with an elastic ring type squeeze film damper, and recording the size parameters of an aeroengine prototype;
based on the parameters of the prototype of the aircraft engine, the parameters of the reduced scale model system for the test are determined by adopting a similarity criterion determined by a dimensional analysis method and an integral simulation method, and the parameters are as follows:
the vibration equation of the rotating shaft is as follows:
wherein x and y are respectively the length and deflection of the rotating shaft; e is the modulus of elasticity; m and I are respectively mass and section distance; a is rotational inertia; p (x) is the imbalance force of the system; ω is the rotor speed.
The similarity criterion derived from dimensional analysis and integral simulation is as follows:
the similarity relation of the rotating shafts is derived from the similarity ratio as follows:
wherein G is gravity, G is acceleration of gravity, ρ and J p Density and moment of inertia, respectively, and d is the diameter.
Through a dimension analysis method, the similar relation of the turnplate can be obtained as follows:
λ m ＝λ ρ λ d 2 λ l
the equation of motion for the resilient support is:
in the formula M 0 For elastically supporting the masses, K 0 For support stiffness, Q is the unbalanced force, and the similarity criterion according to the integral simulation method is as follows:
in order to satisfy the consistent similarity ratio of the elastic support and the acting force outside the system, the similarity relationship of the elastic support is deduced as follows:
and determining the size parameters of the combined support according to the support stiffness determined by the similarity criterion, finally determining the size parameters of the similar model of the rotor system with the elastic ring type squeeze film damper, processing and manufacturing the rotor model for the test, and then performing the similar simulation test on the processed rotor system with the elastic ring type squeeze film damper.
3. A rotor system analog simulation test bed with an elastic ring type squeeze film damper is characterized by comprising a platform, an electric control system, a combined supporting rotor system, an oil supply system, a temperature control system and a sensor test system, wherein the electric control system, the combined supporting rotor system, the oil supply system, the temperature control system and the sensor test system are arranged on the platform; the combined support rotor system comprises a rotating shaft, a disc and a combined support, wherein the input end of the rotating shaft is arranged on the rotor variable frequency motor, the rotating shaft is arranged on the combined support, the combined support comprises an elastic ring type squeeze film damper, and the sensor testing system is arranged between the end combined support and the end tail combined support; the electric control system is connected with the rotor variable frequency motor and is used for adjusting the rotating speed of the rotor variable frequency motor; the oil supply system is used for supplying oil to the elastic ring type squeeze film damper; the temperature control system is used for heating and controlling the temperature of the lubricating oil in the oil supply system; the sensor testing system collects rotor system vibration signals of the rotor system with the elastic ring type squeeze film damper under various oil film temperatures based on the adjustment of parameters of the electric control system, the oil supply system and the temperature control system so as to perform a dynamic characteristic comparison test.
4. The rotor system analog simulation test bed with the elastic ring type squeeze oil film damper according to claim 3, wherein the electrical control system comprises an electrical control cabinet installed on the ground, a rotor variable frequency motor control system and a motor support used for fixing the rotor variable frequency motor; a motor starting button, a stopping button, an emergency stopping button and a control panel are arranged outside the electric control cabinet; the rotor variable frequency motor control system arranged inside comprises a frequency converter, an alternating current contactor and a fuse protector; the start button and the stop button control the start and stop of the rotor variable frequency motor, and the frequency converter adjusts the rotating speed of the rotor variable frequency motor; the rotor variable frequency motor transmits torque to the combined supporting rotor system through the flexible coupling; wherein the right end of the coupler is connected with the left end of the coupler through a nylon rope by the flexible coupler.
5. The rotor system analog simulation test bed with the elastic ring type squeeze oil film damper as claimed in claim 3, wherein the combined support comprises a bearing end cover, a bearing, an elastic ring, a bearing seat and a mouse cage, the front end of the mouse cage is provided with the bearing, the front end of the bearing is provided with the bearing end cover, the mouse cage is installed in the bearing seat through the elastic ring, a region through lubricating oil exists between the bearing seat and the elastic ring, the region is of a structure that the lubricating oil passes through, the elastic ring type squeeze oil film damper is formed by the structure, and the bearing seat is fixed on the combined support through a bolt; the disc is fixed on the rotating shaft through the expansion sleeve, and the rotary shaft sealing device further comprises a sealing system, wherein the sealing system is composed of two groups of sealing rings and is installed at a sealing groove between the squirrel cage and the bearing seat, and a sealing and non-sealing comparison test of the rotor system with the elastic ring type squeeze film damper is carried out based on whether the sealing rings are installed or not.
6. The rotor system analog simulation test bed with the elastic ring type squeeze oil film damper according to claim 3, wherein the sensor test system comprises a sensor support, and a plurality of eddy current sensors, a vibration test acquisition device, a power amplifier and an LMS vibration test device which are fixed on the sensor support, wherein the LMS vibration test device is used for testing dynamic vibration tests of an axis track, a time domain response, a frequency response curve and a waterfall diagram of the rotor system; the power amplifier and the LMS vibration testing device are used for collecting data, are respectively connected with the eddy current sensors in the horizontal direction and the vertical direction, and transmit the data to the vibration testing and collecting device.
7. The simulation test method of the rotor system simulation test bed with the elastic ring type squeeze film damper according to any one of claims 3 to 6, characterized by comprising a rotor system simulation test with the elastic ring type squeeze film damper at different oil supply temperatures, a rotor system simulation test with the elastic ring type squeeze film damper with a seal, and a rotor system simulation test with the elastic ring type squeeze film damper under different structural parameters.
8. The method of claim 7, wherein the similar simulation test of the rotor system of the squeeze film damper with the elastic ring at different oil supply temperatures comprises the following steps:
starting an oil supply system to supply oil to the elastic ring type squeeze film damper, and arranging the eddy current displacement sensor in the vertical and horizontal directions of a disc of a rotor analog simulation test bed with the elastic ring type squeeze film damper;
starting a temperature control system, and respectively setting three groups of different oil supply temperatures, namely high, medium and low, for supplying oil;
an electrical control system is adopted to start a rotor variable frequency motor, data are collected in a full rotating speed range and transmitted to a vibration test collection device, and the data are processed to finally obtain the axle center track, time domain response, frequency response curve and waterfall chart dynamic vibration characteristics of a rotating subsystem at different oil supply temperatures;
and analyzing and obtaining the influence of different oil supply temperatures on the dynamic vibration characteristic of the rotor system of the belt elastic ring type squeeze film damper by comparing the dynamic vibration characteristics at different temperatures.
9. The method of claim 7, wherein the sealed elastomeric ring squeeze film damper rotor system simulation test comprises the steps of:
an electrical control system is adopted to start a rotor variable frequency motor, vibration data of the rotor similar test bed in a full rotating speed range in an unsealed state are obtained at normal temperature and transmitted to a vibration test acquisition device, and an axis track, time domain response, a frequency response curve and a waterfall chart dynamic vibration characteristic of a rotor system in the unsealed state are obtained;
respectively installing two groups of sealing rings at a combined supporting position, arranging eddy current displacement sensors at the same positions to perform a vibration test of the rotor similar test bed in a full rotating speed range in a sealing state under a normal temperature condition, and acquiring an axis locus, a time domain response, a frequency response curve and a waterfall diagram dynamic vibration characteristic of a rotor system in the sealing state;
and analyzing the influence of the seal on the dynamic vibration characteristic of the rotor system of the elastic ring type squeeze film damper by comparing the dynamic vibration characteristic of the rotor system with or without the seal.
10. The method according to claim 7, wherein the elastic ring type squeeze film damper rotor system similarity simulation test under different structural parameters comprises the following steps:
starting a rotor variable frequency motor, and acquiring vibration data of the rotor analog simulation test bed in a full rotating speed range in an unsealed state at normal temperature by using an eddy current displacement sensor;
replacing two groups of elastic ring type squeeze film dampers with different structural parameters to obtain vibration data of the rotor similarity simulation test bed in the full rotating speed range under different structural parameters;
processing the vibration data through a vibration test acquisition device to finally obtain the axle center track, time domain response, frequency response curve and waterfall chart dynamic vibration characteristics of the rotor system with the elastic ring type squeeze film damper under three groups of different structural parameters;
and comparing the dynamic vibration characteristics of the sub-conversion systems under the structural parameters of different elastic ring type squeeze film dampers, and analyzing the influence of the structural parameters of the elastic ring type squeeze film dampers on the dynamic vibration characteristics of the rotor system of the elastic ring type squeeze film dampers.
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| CN116127654A (en) * | 2023-04-17 | 2023-05-16 | 中国航发四川燃气涡轮研究院 | Design method of damper simulation tester with elastic ring type extrusion oil film |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116127654A (en) * | 2023-04-17 | 2023-05-16 | 中国航发四川燃气涡轮研究院 | Design method of damper simulation tester with elastic ring type extrusion oil film |
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