CN109708802B - Distributed pressure test device and test method for squeeze film damper - Google Patents
Distributed pressure test device and test method for squeeze film damper Download PDFInfo
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- CN109708802B CN109708802B CN201910131544.4A CN201910131544A CN109708802B CN 109708802 B CN109708802 B CN 109708802B CN 201910131544 A CN201910131544 A CN 201910131544A CN 109708802 B CN109708802 B CN 109708802B
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Abstract
The distributed pressure test device for the squeeze film damper comprises a fiber grating sensing test device, a first support, a turntable shaft, a second support, a coupler, a driving motor and a base, and the distributed pressure test method for the squeeze film damper comprises the following steps: the method comprises the steps of fiber grating sensor arrangement, sensor packaging, parameter calibration and temperature compensation and decoupling. The testing device is simple in structure, and can simulate the distributed pressure test change of the squeeze film damper of the gas turbine engine under the conditions of unbalanced rotor and unsymmetrical fulcrum under the complex working conditions; the pressure testing method can obtain the circumferential multipoint and axial multi-surface spatial pressure distribution association relation of the squeeze film damper under the complex working condition; the adopted fiber grating sensor has the advantages of one line, multiple points, high sensitivity and small volume, is convenient for sensor arrangement, and has little influence and change on the squeeze film damper; and temperature compensation and decoupling are adopted, so that the influence of temperature change on a test result is reduced, and the pressure test result is more accurate.
Description
Technical Field
The present invention relates to the field of gas turbine engines in rotary machines.
Background
The squeeze film damper is an important vibration reduction structure of a gas turbine rotor support represented by an aircraft engine, lubricating oil is introduced into a gap between a squirrel cage outer ring and a web inner ring to form a squeeze film, the vibration energy of the rotor is consumed through the squeezing of the oil film, and the external transmission load and the vibration of the aircraft engine rotor are reduced; the pressure distribution and the size of the squeeze film damper are critical parameters during action, the vibration reduction effect of the squeeze film damper is directly influenced, the circumferential pressure and the axial pressure distribution of the squeeze film damper change along with the working conditions of an aircraft engine rotor, for example, the pressure distribution of the squeeze film damper is complicated to change due to the working conditions of unbalance and friction of the rotor, the axial pressure difference of the squeeze film damper is caused by the over-critical pitching vibration of the rotor and the like, and the change is extremely complicated; therefore, the pressure distribution of the squeeze film damper is obtained, and the method has important significance for theoretical analysis and design of the squeeze film damper.
At present, a semi-oil film or full-oil film hypothesis is mainly adopted theoretically, a Reynolds equation is solved through a numerical analysis method to obtain nonlinear extrusion oil film pressure or oil film force, although some scholars also adopt pressure sensors (a sliding bearing lubricating film dynamic characteristic test method-201010583181.7 and a liquid sliding bearing full-circle lubricating film pressure wireless monitoring method-201010572585) and fiber grating sensors (CN radial sliding bearing bush temperature field and pressure field test platform and measurement method-201810366850.1) to apply test pressure on the sliding bearing, the extrusion oil film damper and the sliding bearing are different in structure, function, spatial arrangement and even working conditions. From the published data, a distributed pressure testing method for the squeeze film damper is lacked, the traditional pressure sensor and the traditional strain gauge cannot realize effective testing of distributed pressure due to the size limitation of the pressure sensor, the squeeze film damper is subjected to a lot of changes, effective experimental data of the squeeze film damper pressure under complex working conditions cannot be obtained, and therefore the theory cannot be verified and the design is effectively improved.
Disclosure of Invention
The invention aims to solve the problems and provides a distributed pressure test device and a test method of an extruded oil film damper based on fiber bragg grating sensing, so that the axial multi-surface and circumferential multi-point space pressure distribution test of the extruded oil film damper is realized.
The technical scheme adopted by the invention for realizing the purpose is as follows: a first support 2 and a second support 4 are installed on a base 7, symmetrical through holes are formed in the first support 2 and the second support 4, a mouse cage 22 is installed in the through hole of the first support 2, the mouse cage 22 is fixedly installed on a support 21 of the first support 2, one side of the mouse cage 22 is fixedly connected with a bearing seat 24, a support bearing 23 is installed on the bearing seat 24, an extrusion oil film support 25 located on the upper portion of the bearing seat 24 is fixedly connected with one side of the support 21, a gap is formed between the extrusion oil film support 25 and the bearing seat 24, a sealing hole 252 is formed in the middle of the extrusion oil film support 25, a sealing ring 26 is arranged between the sealing hole 252 and the bearing seat 24, an oil film hole 254 is formed in the middle of the extrusion oil film support 25, an oil hole 255 is formed in the upper portion and the lower portion of the oil film hole 254 respectively, the oil hole 255 is connected with a hydraulic joint 27, the distance between the annular groove 256 and the end faces of the two sides of the oil film hole 254 is the same, and a threading hole 257 which is used for a fiber grating sensor signal wire to pass through and runs through the upper part of the squeeze oil film support 25 is arranged at the upper part of the annular groove 256; the support bearing 23 is connected to carousel axle 3 one end, and the carousel axle 3 other end passes through the bearing and installs on second support 4, and the driving motor 6 that is located second support 4 one side is connected through the shaft coupling to the one end that carousel axle 3 is located second support 4.
The annular grooves 256 are internally provided with fiber grating sensing strings respectively, the number of the fiber grating sensing strings is consistent with that of the annular grooves 256, the measuring points of a single fiber grating sensing string are connected and communicated through fiber signal lines, and the fiber signal lines are connected with the collector 12 through the wire penetrating hole 257; fiber bragg grating sensing is arranged in the single annular groove 256, a plastic rubber sleeve is arranged outside one measuring point, and the measuring point serves as a temperature measuring point 112; other fiber bragg grating sensors are directly attached to the inside of the annular groove 256 in an adhering mode to serve as pressure measuring points 111, and the pressure measuring points 111 are uniformly arranged along the circumferential direction.
The fiber bragg grating sensor and the signal line thereof are fixed in the annular groove 256 in a sticking manner, and epoxy resin glue is filled in the annular groove 256; the optical fiber signal lines in the threading holes 257 are fixed and sealed by epoxy resin glue to the threading holes 257.
One side of the squeeze film support 25 is provided with a cylindrical positioning spigot 251 for positioning the support 21, and two side surfaces of the squeeze film support 25 are provided with bolt connecting through holes 258 for connecting and fixing the squeeze film support 25 and the support 21 through bolts.
And a sealing groove 253 for placing a sealing ring 26 is arranged on a sealing hole 252 in the middle of the squeeze film support 25, the sealing ring 26 is installed in a matching way with the bearing seat 24, and the sealing groove 253 is arranged in a left-right symmetrical way.
The diameter of the oil film hole 254 is larger than that of the sealing hole 252, and the diameter difference is 0.5-1.5 mm.
The distributed pressure test device and the test method for the squeeze film damper comprise the following steps:
step one, arranging a fiber grating sensor, arranging the fiber grating sensor in the axial direction of an extrusion oil film damper: fiber bragg grating sensing strings are respectively arranged in the annular grooves 256, the number of the fiber bragg grating sensing strings is consistent with that of the annular grooves 256, the measuring points of the single fiber bragg grating sensing string are connected and communicated through fiber signal lines, and the fiber signal lines are connected with the collector 12 through the wire penetrating hole 257; arranging an optical fiber grating sensor in the circumferential direction of the squeeze film damper: fiber bragg grating sensing is arranged in the single annular groove 256, a plastic rubber sleeve is arranged outside one measuring point, and the measuring point serves as a temperature measuring point 112; other fiber bragg grating sensors are arranged in the annular groove 256 to serve as pressure measuring points 111, and the pressure measuring points 111 are uniformly arranged along the circumferential direction;
step two, packaging a sensor, sticking and fixing the fiber bragg grating sensor and a signal wire thereof in an annular groove 256 of the squeeze film damper, and filling the annular groove 256; pasting and fixing the optical fiber signal line in the threading hole 257, and sealing the threading hole 257;
step three, calibrating pressure parameters, connecting a joint 27 on an oil hole of the squeeze film damper with a pressure gauge, introducing pressure oil with different sizes into an oil inlet on the other side of the squeeze film damper, holding the pressure, continuously changing the pressure value of the oil inlet, recording data between the oil pressure and the wavelength of different measuring points of the fiber bragg grating sensor, and obtaining pressure conversion coefficients K of the different measuring points by the aid of the obtained multiple groups of data through a least square method data fitting methodp1、Kp2、Kp3…..；
And fourthly, temperature compensation and decoupling, namely performing correction compensation on the pressure measuring point 111 by using the temperature measuring point 112 of the compensation fiber grating sensor, wherein the pressure calculation formula is as follows:
wherein λ is1Corresponding to the wavelength of the pressure measuring point 111 of the fiber grating sensor △ lambda1The wavelength variation of the corresponding fiber bragg grating sensor pressure measuring point 111; kpThe pressure conversion coefficient of the fiber bragg grating is obtained; k2TThe temperature conversion coefficient of the fiber bragg grating is obtained; lambda [ alpha ]2Corresponding to the wavelength of the temperature measuring point 112 of the fiber grating sensor △ lambda2For corresponding temperature measuring point of fiber grating sensor112, wavelength variation; and p is the pressure value of the fiber grating sensor pressure measuring point 111.
In the fourth step: fixing the rotating speed of a driving motor 6, applying unbalance amounts with different masses on a turntable shaft 3, and testing the influence of centrifugal load generated by the unbalance amounts on the pressure of the squeeze film damper by using a fiber grating sensing testing device 1; fixing the rotating speed of a driving motor 6, raising a first support 2 containing an extrusion oil film damper in a gasket mode, arranging asymmetry for the first support 2 and a second support 4, and testing oil film pressure changes with additional different measuring points generated in different supporting points by adopting a fiber grating sensing testing device 1; and (3) increasing the rotating speed of the driving motor 6 to enable the rotor system to cross the first-order critical, and testing the oil film pressure change of the squeeze oil film damper by adopting the fiber grating sensing testing device 1.
According to the distributed pressure test device and the test method for the squeeze film damper, disclosed by the invention, the test device is simple in structure, can simulate the condition of complex working conditions such as unbalanced rotor and asymmetric fulcrum, and provides technical support for the research on the distributed pressure test change of the squeeze film damper of the gas turbine engine under the complex working conditions; the method can be used for researching the spatial pressure distribution incidence relation of circumferential multipoint and axial multifaceted of the squeeze film damper; the adopted fiber grating sensor has the advantages of one line, multiple points, high sensitivity and small volume, is convenient for sensor arrangement, and has little influence and change on the squeeze film damper; and temperature compensation and decoupling are adopted, so that the influence of temperature change on a test result is reduced, and the pressure test result is more accurate.
Drawings
FIG. 1 is a front view structural diagram of a distributed pressure testing device of a squeeze film damper based on fiber grating sensing according to the present invention;
FIG. 2 is a schematic diagram of the fiber grating sensing test device of the present invention;
FIG. 3a is a schematic cross-sectional view of the elastic support pivot and squeeze film damper of the present invention;
FIG. 3b is a partial enlarged structural view of portion A of FIG. 3 a;
FIG. 4a is a sectional front view of the squeeze film mount of the present invention;
FIG. 4b is a perspective view of the squeeze film mount of the present invention;
FIG. 4c is a cross-sectional view A-A of FIG. 4 a;
FIG. 5a is a block diagram of the fiber grating sensor arrangement of the present invention;
FIG. 5b is a cross-sectional structural view of the fiber grating sensing arrangement of the present invention;
FIG. 6 is a diagram of a package structure of fiber grating sensor according to the present invention;
FIG. 7 is a schematic diagram of fiber grating sensor calibration according to the present invention;
in the figure: 1. the device comprises a fiber bragg grating sensing testing device 11, a fiber bragg grating sensor 111, a pressure testing point 112, a temperature testing point 12, a collector 13, a computer 2, a first support 21, a support 22, a squirrel cage 23, a support bearing 24, a bearing seat 25, an extrusion oil film support 26, a sealing ring 27, a hydraulic joint 251, a positioning spigot 252, a sealing hole 253, a sealing groove, an oil film hole 254, 255, an oil hole 256, an annular groove 257, a threading hole 258, a bolt connecting through hole 3, a turntable shaft 4, a second support 5, a coupler 6, a driving motor 7 and a base.
Detailed Description
As shown in figure 1, the distributed pressure test device of the squeeze film damper based on fiber grating sensing comprises a fiber grating sensing test device 1, a first support 2, a turntable shaft 3 and a second support 4, coupler 5, driving motor 6, base 7 is constituteed, first support 2, the second supports 4 and is used for supporting pivot carousel axle 3 rotatory, driving motor 6 is located the second and supports 4 one sides, motor 6 passes through coupler 5 and is connected with carousel axle 3, it is rotatory to drive carousel axle 3, driving motor 6 passes through bolt and base 7 fixed connection, first support 2 can be the same structure with second support 4, also can not the isostructure, this embodiment is for the convenience to contrast, first support 2 supports 4 descriptions for the isostructure with the second, first support 2 is for having extrusion oil film damper structure and fiber grating sensing testing arrangement's fulcrum, second support 2 is elastic support's fulcrum structure commonly used.
As shown in fig. 2, the fiber grating sensing and testing device 1 is used for collecting pressure and temperature information of an extrusion oil film damper, and comprises a fiber grating sensor 11, a collector 12 and a computer 13; the fiber grating sensor 11 tests the wavelength signal change caused by the temperature and the pressure of the squeeze film damper frame; collector 12 is used for collecting the wavelength signal change of the fiber bragg grating; the computer 13 is used for converting the wavelength signals into pressure and temperature information, and displaying and storing the information.
With reference to fig. 3a and 3b, the first support 2 is a fulcrum having a squeeze film damper structure, and includes a support 21, a mouse cage 22, a support bearing 23, a bearing seat 24, a squeeze film support 25, a seal ring 26, and a hydraulic joint 27, the support 21 is fixedly connected to the base 7 by bolts, the mouse cage 22 is fixedly connected to the support 21 by bolts, the bearing seat 24 is fixedly connected to the mouse cage 22 by bolts, the support bearing 23 is mounted and fixed inside the bearing seat 24, and the support bearing 23 is a rolling bearing for supporting the rotation of the turntable shaft 3; the squeeze film support 25 is fixedly connected with the support 21 through bolts, and has a certain gap with the bearing seat 24 to form a squeeze film damper. The squeeze film support 25 is provided with a sealing groove 253 for installing a seal 26 for sealing pressure oil of the squeeze film damper to prevent the oil from leaking when the squeeze film damper operates, and a hydraulic joint 27 is arranged at an oil inlet and an oil return port of the squeeze film support 25 and is used for connecting a hydraulic pipeline to enable hydraulic oil to flow and dissipate energy generated by rotor vibration.
Referring to fig. 4, a cylindrical positioning spigot 251 is provided at one side of the squeeze film support 25 for positioning the support 21, and a plurality of bolt connecting through holes 258 are provided at both sides for fixedly connecting the squeeze film support 25 and the support 21 by bolts. A sealing hole 252 is formed in the middle of the squeeze film support 25, and a plurality of sealing grooves 253 are formed in the sealing hole 252 and used for placing the sealing ring 26 to be matched with the bearing seat 24 to play a role in sealing lubricating oil; the sealing grooves 253 are arranged in bilateral symmetry. An oil film hole 254 is arranged in the middle of the squeeze film support 25 and symmetrically arranged along the sealing groove 253, and the diameter of the oil film hole 254 is slightly larger than that of the sealing hole 252, preferably 0.5-1.5mm larger; the upper part and the lower part of the oil film hole 254 are respectively provided with an oil hole 255, the oil hole 255 is provided with a thread structure and is used for fixedly mounting a hydraulic joint 27 which is an oil inlet and an oil return port respectively, so that hydraulic oil enters and exits the squeeze film damper. A plurality of annular grooves 256 are formed in two sides of the oil film hole 254 and used for mounting the fiber grating sensor 11; the distance between the sensor groove 256 and the end faces of the two sides of the oil film hole 254 is the same, and the upper part of the annular groove 256 is provided with a penetrating threading hole 257 which penetrates through the upper part of the oil film extrusion support 25 and is used for a fiber grating sensor signal wire to penetrate through.
The distributed pressure testing method of the squeeze film damper based on the fiber bragg grating sensing comprises fiber bragg grating sensor arrangement, sensor packaging, pressure parameter calibration, temperature compensation and decoupling. The fiber bragg grating sensor is arranged for testing the circumferential multipoint and axial multi-surface space pressure of the squeeze film damper; the sensor package is used for fixing and sealing the fiber bragg grating sensor, so that the sensor, the signal wire and the squeeze film damper are integrated; the pressure parameter calibration is used for calibrating the relation between the pressure of each measuring point and the wavelength parameter; the temperature decoupling is used for eliminating the influence of the temperature change of the squeeze film damper on the wavelength change during pressure testing, so that the pressure testing result is more accurate.
The distributed pressure testing method of the squeeze film damper based on the fiber bragg grating sensing comprises the following steps:
firstly, arranging a fiber bragg grating sensor
Referring to fig. 5, the fiber grating sensor is divided into a pressure measuring point 111 and a temperature measuring point 112. Arranging an optical fiber grating sensor in the axial direction of the squeeze film damper: the squeeze film mount 25 is provided with a plurality of annular grooves 256, which in this example is illustrated by two axial flats of the squeeze film damper with two annular grooves 256, which may be axial multi-flats. The left annular groove 256 and the right annular groove 256 are respectively provided with a fiber grating sensing string, and the number of the fiber grating sensing strings is consistent with that of the annular grooves 256; the single fiber bragg grating sensing string is provided with a plurality of FBG measuring points, and the measuring points are connected and communicated through optical fiber signal lines; the optical fiber signal line is transmitted out from the threading hole 257 and is directly connected with the collector 12.
Arranging an optical fiber grating sensor in the circumferential direction of the squeeze film damper: a plurality of fiber bragg grating sensors (FBG measuring points) are arranged in a single annular groove, one measuring point penetrates through a plastic rubber sleeve, so that the measuring point is not in direct contact with an extrusion oil film damper, only temperature change is sensed, wavelength change caused by pressure change is avoided, the measuring point serves as a temperature measuring point 112, and one temperature measuring point 112 is preferably selected; and other fiber bragg grating sensors (FBG measuring points) are directly attached to the inside of the annular groove in an adhering mode to serve as a plurality of pressure measuring points 111, and the pressure measuring points are uniformly arranged along the circumferential direction.
Step two, packaging the sensor
Referring to fig. 6, after the fiber grating sensor and the signal line thereof are adhered and fixed to the annular groove 256 of the squeeze film damper, the annular groove 256 is filled with epoxy resin glue. After solidification, removing the redundant epoxy resin glue, ensuring that the inner surface of the annular groove 256 and the inner surface of the oil film hole 254 are smooth and flat, and avoiding the influence of the installation and arrangement of the sensor on the structure and the performance of the squeeze oil film damper to the maximum extent; and fixing the optical fiber signal line in the threading hole 257 by using epoxy resin glue, and sealing the threading hole 257.
Step three, calibrating pressure parameters
With reference to fig. 7, the relationship between pressure and wavelength at different measuring points is different due to the difference of sensor adhesion, and parameter calibration is required. And connecting a joint 27 on an oil hole of the squeeze film damper with a pressure gauge, and introducing pressure oil with different sizes into an oil inlet on the other side of the squeeze film damper to hold the pressure. Continuously changing the pressure value of the oil inlet, recording the data between the oil pressure and the wavelength of different measuring points of the fiber bragg grating sensor, and obtaining the pressure conversion coefficient K of the different measuring points by the obtained multiple groups of data through a least square method data fitting methodp1、Kp2、Kp3…..。
Step four, temperature compensation and decoupling
The wavelength change of the fiber bragg grating sensor is influenced by strain and temperature, the test signal comprises a temperature signal and a pressure signal of an extrusion oil film damper, the temperature measuring point 112 of the compensation fiber bragg grating sensor is used for correcting and compensating the pressure measuring point 111, and then the pressure calculation formula is as follows:
wherein λ is1Corresponding to the wavelength of the pressure measuring point 111 of the fiber grating sensor △ lambda1The wavelength variation of the corresponding fiber bragg grating sensor pressure measuring point 111; kpThe pressure conversion coefficient of the fiber bragg grating is obtained; k2TThe temperature conversion coefficient of the fiber bragg grating is obtained; lambda [ alpha ]2Corresponding to the wavelength of the temperature measuring point 112 of the fiber grating sensor △ lambda2The wavelength variation of the temperature measuring point 112 of the corresponding fiber bragg grating sensor; and p is the pressure value of the fiber grating sensor pressure measuring point 111.
Distributed pressure test device and method for squeeze film damper based on fiber grating sensing
Test 1: fixing the rotating speed of a driving motor 6, applying unbalance amounts with different masses on a turntable shaft 3, testing the unbalance amounts by adopting a fiber grating sensing testing device 11 to generate centrifugal loads, and researching the influence of the unbalance amounts on the pressure of an extrusion oil film damper;
test 2: the rotating speed of a driving motor 6 is fixed, the fulcrum 2 containing the squeeze film damper is heightened in a gasket mode, the two fulcrums are asymmetrically arranged, and the fiber grating sensing testing device 1 is used for testing oil film pressure changes of additional different testing points generated in different fulcrums.
Test 3: and (3) increasing the rotating speed of the driving motor 6 to enable the rotor system to cross the first-order critical, testing the oil film pressure change of the squeeze oil film damper by adopting the fiber grating sensing testing device 1, and researching the oil film pressure change during resonance and the axial oil film pressure difference caused by the first-order critical crossing.
While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (8)
1. Distributed pressure test device of squeeze film damper, its characterized in that: a first support (2) and a second support (4) are arranged on a base (7), symmetrical through holes are formed in the first support (2) and the second support (4), a squirrel cage (22) is arranged in the through hole of the first support (2), the squirrel cage (22) is fixedly arranged on a support (21) of the first support (2), one side of the squirrel cage (22) is fixedly connected with a bearing seat (24), a support bearing (23) is arranged on the bearing seat (24), an extrusion oil film support (25) positioned on the upper portion of the bearing seat (24) is fixedly connected with one side of the support (21), a gap is formed between the extrusion oil film support (25) and the bearing seat (24), a sealing hole (252) is formed in the middle of the extrusion oil film support (25), a sealing ring (26) is arranged between the sealing hole (252) and the bearing seat (24), an oil film hole (254) is formed in the middle of the extrusion oil film support (25), and oil holes (255) are, the oil hole (255) is connected with the hydraulic joint (27), two sides of the oil film hole (254) are provided with annular grooves (256) used for installing the fiber grating sensor (11), the distance between the annular grooves (256) and the end surfaces of the two sides of the oil film hole (254) is the same, and the upper part of the annular grooves (256) is provided with a threading hole (257) which is used for a signal wire of the fiber grating sensor to pass and penetrates through the upper part of the squeeze oil film support (25); supporting bearing (23) is connected to carousel axle (3) one end, and the carousel axle (3) other end runs through the bearing to be installed on second support (4), and the driving motor (6) that the one end that carousel axle (3) is located second support (4) passes through the coupling joint and is located second support (4) one side.
2. The distributed pressure test device of claim 1, wherein: the fiber bragg grating sensing device is characterized in that fiber bragg grating sensing strings are respectively arranged in the annular grooves (256), the number of the fiber bragg grating sensing strings is consistent with that of the annular grooves (256), the single fiber bragg grating sensing string measuring points are connected and communicated through fiber signal lines, and the fiber signal lines are connected with the collector (12) through the wire penetrating holes (257); fiber bragg grating sensing is arranged in the single annular groove (256), a plastic rubber sleeve is arranged outside one measuring point, and the measuring point serves as a temperature measuring point (112); other fiber bragg grating sensors are directly attached to the inside of the annular groove (256) in an adhering mode to serve as pressure measuring points (111), and the pressure measuring points (111) are uniformly arranged along the circumferential direction.
3. The squeeze film damper distributed pressure test device of claim 2, wherein: the fiber bragg grating sensor and the signal wire thereof are fixed in an annular groove (256) in a sticking way, and epoxy resin glue is filled in the annular groove (256); the optical fiber signal line in the threading hole (257) is fixed and sealed through epoxy resin glue, and the threading hole (257) is sealed.
4. The distributed pressure test device of claim 1, wherein: one side of the squeeze film support (25) is provided with a cylindrical positioning spigot (251) for positioning the support (21), and two side faces of the squeeze film support (25) are provided with bolt connecting through holes (258) for connecting and fixing the squeeze film support (25) and the support (21) through bolts.
5. The distributed pressure test device of claim 1, wherein: the middle sealing hole (252) of the squeeze oil film support (25) is provided with a sealing groove (253) for placing a sealing ring (26), the sealing ring (26) is installed in a matched mode with the bearing seat (24), and the sealing groove (253) is arranged in a left-right symmetrical mode.
6. The distributed pressure test device of claim 1, wherein: the diameter of the oil film hole (254) is larger than that of the sealing hole (252), and the diameter difference is 0.5-1.5 mm.
7. The testing method of the distributed pressure testing device of the squeeze film damper according to claim 1, characterized in that: the method comprises the following steps:
step one, arranging a fiber grating sensor, arranging an axial direction sensor of an extrusion oil film damper: the fiber bragg grating sensing strings are respectively arranged in the annular grooves (256), the number of the fiber bragg grating sensing strings is consistent with that of the annular grooves (256), the single fiber bragg grating sensing string measuring points are connected and communicated through fiber signal lines, and the fiber signal lines are connected with the collector (12) through the threading holes (257); arranging a circumferential direction sensor of the squeeze film damper: fiber bragg grating sensing is arranged in the single annular groove (256), a plastic rubber sleeve is arranged outside one measuring point, and the measuring point serves as a temperature measuring point (112); other fiber bragg grating sensors are arranged in the annular groove (256) to serve as pressure measuring points (111), and the pressure measuring points (111) are uniformly arranged along the circumferential direction;
step two, packaging a sensor, sticking and fixing the fiber bragg grating sensor and a signal wire thereof in an annular groove (256) of the squeeze film damper, and filling the annular groove (256); pasting and fixing the optical fiber signal wires in the threading holes (257), and sealing the threading holes (257);
step three, calibrating pressure parameters, connecting a joint (27) on an oil hole of the squeeze film damper to a pressure gauge, introducing pressure oil with different sizes into an oil inlet on the other side of the squeeze film damper to hold down the pressure, continuously changing the pressure value of the oil inlet, recording data between the oil pressure and the wavelength of different measuring points sensed by the fiber bragg grating, and obtaining pressure conversion coefficients K of the different measuring points by the obtained multiple groups of data through a least square method data fitting methodp1、Kp2、Kp3…；
And fourthly, temperature compensation and decoupling, namely correcting and compensating the pressure measuring point (111) by using the temperature measuring point (112) of the compensation fiber grating sensor, wherein the pressure calculation formula is as follows:
wherein λ is1Is the wavelength of the pressure measuring point (111) of the corresponding fiber grating sensor, △ lambda1The wavelength variation of the corresponding fiber bragg grating sensor pressure measuring point (111); kpThe pressure conversion coefficient of the fiber bragg grating is obtained; k2TThe temperature conversion coefficient of the fiber bragg grating is obtained; lambda [ alpha ]2Is the wavelength of the temperature measuring point (112) of the corresponding fiber grating sensor, △ lambda2The wavelength variation of the temperature measuring point (112) of the corresponding fiber bragg grating sensor is obtained; p is optical fiber grating sensorThe pressure value of the pressure measuring point (111).
8. The testing method of the distributed pressure testing device of the squeeze film damper according to claim 7, characterized in that: in the fourth step: the rotating speed of a driving motor (6) is fixed, unbalance amounts with different masses are applied to a turntable shaft (3), and the influence of centrifugal load on the pressure of the squeeze film damper is generated by testing the unbalance amounts by using a fiber grating sensing testing device (1); the rotating speed of a driving motor (6) is fixed, a first support (2) containing an extrusion oil film damper is heightened in a gasket mode, the first support (2) and a second support (4) are arranged asymmetrically, and an optical fiber grating sensing testing device (1) is adopted to test oil film pressure changes of different measuring points in different test fulcrums; the rotating speed of the driving motor (6) is increased to enable the rotor system to cross the first-order critical, and the oil film pressure change of the squeeze oil film damper is tested by adopting the fiber grating sensing testing device (1); the fiber grating sensing and testing device (1) is used for collecting pressure and temperature information of the squeeze film damper and comprises a fiber grating sensor (11), a collector (12) and a computer (13); the fiber grating sensor (11) is used for testing the wavelength signal change caused by the temperature and the pressure of the squeeze film damper frame; the collector (12) is used for collecting the wavelength signal change of the fiber bragg grating, and the computer (13) is used for converting the wavelength signal into pressure and temperature information, displaying and storing the pressure and temperature information.
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| CN106353076A (en) * | 2016-07-07 | 2017-01-25 | 大连海事大学 | Tester for determining dynamic characteristic coefficient of squeeze film damper |
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| CN108007692A (en) * | 2017-12-28 | 2018-05-08 | 湖南科技大学 | It is a kind of for turboshaft engine birotor experimental bench can dissection type supporting structure |
| CN108279119A (en) * | 2017-12-28 | 2018-07-13 | 华中科技大学 | A kind of squeeze film damper performance test apparatus of Parameter adjustable |
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2019
- 2019-02-22 CN CN201910131544.4A patent/CN109708802B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104697705B (en) * | 2015-03-19 | 2017-03-08 | 中国空气动力研究与发展中心高速空气动力研究所 | A kind of oil film interference surface friction stree measuring method |
| CN105675276A (en) * | 2016-01-13 | 2016-06-15 | 中国航空动力机械研究所 | Device and method for testing vibration damping property of elastic support extruded oil film damper |
| CN106353076A (en) * | 2016-07-07 | 2017-01-25 | 大连海事大学 | Tester for determining dynamic characteristic coefficient of squeeze film damper |
| CN108007692A (en) * | 2017-12-28 | 2018-05-08 | 湖南科技大学 | It is a kind of for turboshaft engine birotor experimental bench can dissection type supporting structure |
| CN108279119A (en) * | 2017-12-28 | 2018-07-13 | 华中科技大学 | A kind of squeeze film damper performance test apparatus of Parameter adjustable |
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