Elastic Ring Type Squeeze Film Damper Fatigue Life Assessment Test Platform

Abstract

The fatigue life assessment test platform for the elastic ring type squeeze film damper of the present invention relates to the technical field of equipment life test devices, and particularly to a fatigue life assessment test device for an elastic ring type squeeze film damper. The vibration platform of the present invention is integrally arranged on the upper part of the basic platform; the exciter is arranged on the upper part of the basic platform, on one side of the integrated vibration platform, and is connected to the integrated vibration platform through a screw rod; the oil supply system is connected to the integrated vibration platform through an oil pipe; the monitoring and control system is remotely connected to the exciter and the integrated vibration platform through a data line and an air pipe. The technical solution of the present invention solves the problems in the prior art that the excitation table type test bench loads the load through the basic excitation method, it is difficult to simulate the actual working conditions of the elastic ring, and the accuracy of the experimental results cannot be guaranteed; the rotor type test bench can better simulate the actual working conditions through a high-speed rotor, but it has high requirements for the accuracy of the test bench, is expensive, and it is difficult to guarantee safety, etc.

Description

Technical Field

[0001] The fatigue life assessment test platform of the elastic ring type squeeze film damper of the present invention relates to the technical field of equipment life test devices, and particularly to the fatigue life assessment test device of the elastic ring type squeeze film damper. Background Technique

[0002] Rotating machinery is a very widely used mechanical structure, which is characterized by being able to efficiently transmit and convert mechanical power, having a simple structure, a mature manufacturing process, and being safe and reliable. Therefore, it is widely used in various fields such as industrial production and aerospace. Moreover, many functions that rotating machinery can achieve are also difficult to replace by other mechanical structures.

[0003] With the development of science and technology, the design and manufacturing processes of various rotating machinery structures have gradually become mature. Along with the improvement of the structure design and manufacturing process technology, the corresponding improvement in the performance requirements of rotating machinery follows. Rotating machinery is gradually developing towards high speed, high reliability, and long life. However, various problems that need to be solved urgently also accompany it, and one of them is the vibration problem of rotating machinery.

[0004] During the high-speed rotation of rotating machinery, when the rotational speed just reaches the critical rotational speed of the mechanical structure, the rotating machinery will generate severe vibrations. At higher rotational speeds, the harm of the vibrations of the mechanical structure cannot be ignored. Vibration will not only affect the stability of the structure, but may seriously damage the structure and even affect the normal operation of the structure, causing not only economic losses, but also potentially threatening the safety of the operator.

[0005] The current solutions to the vibration problem of rotating machinery mainly include elastic supports and dampers. Among them, the elastic ring type squeeze film damper can provide elastic support and damping, effectively reducing the vibration harm of the mechanical structure. However, along with high-frequency vibrations, the performance and reliability of the damper itself are also very important. One of the important performance indicators is the fatigue strength of the elastic ring. Therefore, it is very important to optimize the structure and manufacturing process of the elastic ring, and the assessment of the fatigue life of the elastic ring is also an important measure to judge the fatigue life and reliability of the elastic ring.

[0006] Currently, for the fatigue life assessment of the elastic ring type squeeze film damper, existing technologies generally use a vibration exciter or a rotor type test bench. The vibration exciter loads the load through the foundation excitation method, and it is difficult to simulate the actual working conditions of the elastic ring type squeeze film damper by this method, and the accuracy of the experimental results cannot be guaranteed; the rotor type test bench can better simulate the actual working conditions through a high-speed rotor, but it has high requirements for the accuracy of the test bench, is expensive, and its safety is difficult to guarantee.

[0007] In view of the problems existing in the above-mentioned prior art, it is very necessary to research and design a new type of fatigue life assessment test platform for an elastic ring type squeeze film damper to overcome the problems existing in the prior art. Summary of the Invention

[0008] According to the shaker type test bench proposed in the above-mentioned prior art, which loads the load through the base excitation method, it is difficult to simulate the actual working conditions of the elastic ring, and the accuracy of the experimental results cannot be guaranteed; the rotor type test bench can better simulate the actual working conditions through a high-speed rotor, but it has high requirements for the accuracy of the test bench, is expensive, and it is difficult to ensure safety and other technical problems. Therefore, a fatigue life assessment test platform for an elastic ring type squeeze film damper with novel structure, convenient installation and maintenance, accurate measurement data, high reliability, high automation, and high operation safety is provided.

[0009] The technical means adopted by the present invention are as follows:

[0010] A fatigue life assessment test platform for an elastic ring type squeeze film damper includes: a base platform, a shaker, a vibration platform assembly, an oil supply system, and a monitoring and control system;

[0011] Furthermore, the vibration platform assembly is arranged on the upper part of the base platform;

[0012] Furthermore, the shaker is arranged on the upper part of the base platform, on one side of the vibration platform assembly, and is connected to the vibration platform assembly through a screw;

[0013] Furthermore, the oil supply system is connected to the vibration platform assembly through an oil pipe;

[0014] Furthermore, the monitoring and control system is remotely connected to the shaker and the vibration platform assembly through a data line and an air pipe.

[0015] Furthermore, multiple parallel inverted T-shaped assembly slides are arranged on the top surface of the base platform, and T-shaped sliders are arranged in the slides for assembling the vibration platform assembly and the shaker.

[0016] Furthermore, the vibration platform assembly includes: a cylinder, a force sensor, an oil baffle support, an oil baffle, an inner support ring, an elastic ring, a displacement sensor, an outer support ring, a displacement sensor support, an inner support ring support, a lateral column, a squirrel cage elastic support, a protective cover, an oil retaining ring, a bottom plate, and a T-shaped slider;

[0017] Furthermore, the bottom plate is connected to the T-shaped slider through bolts, and the vibration platform assembly is installed on the upper part of the base platform;

[0018] Furthermore, the inner support ring is fixedly installed on the top of the inner support ring support through bolts;

[0019] Further, the inner support ring bracket is arranged on the upper part of the bottom plate and fixed by bolts;

[0020] Further, the squirrel-cage elastic support is arranged on the outside of the inner support ring bracket, coaxially fixed with the inner support ring bracket, and the outer support ring is fixed by bolts on its upper part;

[0021] Further, the elastic ring is arranged between the inner support ring and the outer support ring and positioned by pins;

[0022] Further, the oil baffle bracket is fixed on the upper part of the inner support ring by bolts, and an oil baffle is arranged on its upper part;

[0023] Further, the oil retaining ring is arranged on the outside of the squirrel-cage elastic support, fixed on the upper part of the bottom plate by bolts, and a sealing ring is arranged at the connection between it and the bottom plate.

[0024] Further, the protective cover is arranged between the squirrel-cage elastic support and the oil retaining ring;

[0025] Further, the lateral column is installed on the outside of the oil retaining ring and fixed on the bottom plate by bolts;

[0026] Further, the cylinder is arranged on the lateral column, connected with the outer support ring through a screw rod, and used to apply a radial force to the elastic ring;

[0027] Further, the displacement sensor bracket is arranged on the lateral column opposite to the cylinder, and a displacement sensor is arranged on it, used to collect displacement data during the test;

[0028] Further, the force sensors are arranged at the connections between the exciter and the outer support ring and between the cylinder and the outer support ring, used to collect force data during the test.

[0029] Further, the monitoring and control system includes: a control system, a power amplifier, a pressure regulating valve, an air compressor, a detection system, and a data acquisition card;

[0030] Further, the detection system is respectively connected with the force sensor and the displacement sensor through the data acquisition card;

[0031] Further, the control system is connected with the exciter through the power amplifier;

[0032] Further, the air compressor is connected with the cylinder through the pressure regulating valve.

[0033] Further, there are two exciters, distributed at the radial positions of the elastic ring.

[0034] Further, there are two cylinders, arranged on two adjacent lateral columns;

[0035] Further, there are two displacement sensors, which are arranged on the lateral columns at the opposite positions of the cylinder and are arranged opposite to the cylinder.

[0036] Further, the oil supply system is integrally connected to the vibrating platform through an oil pipe, and supplies oil to the elastic ring through the oil grooves opened on the inner support ring and the outer support ring.

[0037] Further, lifting eye bolts are arranged on both the lateral columns and the oil retaining ring for the handling and installation of the test bench.

[0038] The experimental process of the present invention is as follows:

[0039] The inner convex platform of the elastic ring cooperates with the inner support ring, and the outer convex platform cooperates with the outer support ring. During the test process, an exciting force with a 90° angle is applied to the outer support ring by the exciter, so as to realize the exciting effect on the elastic ring. A radial force is applied to the outer support ring through the cylinder fixed on the lateral column, so as to realize the radial force on the elastic ring. By adjusting the structure of the squirrel-cage elastic support, the natural frequency of the exciting table can be controlled, so as to control the vibration frequency during the exciting process. The inner support ring is provided with an oil groove, and the elastic ring is supplied with oil through the oil supply system, so as to form an oil film to meet the working environment of the elastic ring. By adjusting the sizes of the inner support ring and the outer support ring, the experimental process of more size types of elastic rings can be satisfied.

[0040] The experimental process of the monitoring and control system of the present invention is as follows:

[0041] A force sensor is arranged between the cylinder and the outer support ring, and the time-domain signal of the cylinder pulling force is detected in real time through the force sensor; a force sensor is also arranged between the exciter and the force sensor bracket, and the time-domain signal of the exciting force is detected in real time by the force sensor; through the displacement sensor, the displacement characteristics of the upper part of the elastic ring under the combined action of the exciting force and the static force applied by the cylinder can be obtained; through the monitoring data fed back by the monitoring system, and the amplitude, frequency and phase of the exciting force of the exciter are adjusted in real time through the control system, so as to simulate the vibration environment of the elastic ring; the magnitude of the force applied by the cylinder can also be adjusted by controlling the air pressure through the pressure regulating valve; the experimental state of the elastic ring can be monitored in real time through the data fed back by the detection system, the life strength of the elastic ring can be analyzed, the reliability of the test piece can be verified, or the elastic ring can be further optimized and improved in combination with the test data.

[0042] Compared with the prior art, the present invention has the following advantages:

[0043] 1. The fatigue life assessment test platform of the elastic ring type squeeze film damper provided by the present invention adopts adjustable supporting components, which can realize the adaptability to test pieces of multiple sizes, making the application range of the test bench wider;

[0044] 2. The fatigue life assessment test platform for an elastic ring type squeeze film damper provided by the present invention uses radial loading for the loading of the test bench. The exciting force and static force are applied to the elastic ring through the outer support ring, which can make the force on the elastic ring more uniform and can better simulate the actual working conditions of the elastic ring type squeeze film damper.

[0045] 3. The fatigue life assessment test platform for an elastic ring type squeeze film damper provided by the present invention is provided with sensors at the radial force-bearing positions of the outer support ring, and displacement sensors are arranged in the vertical direction at the radial positions, so as to realize comprehensive and high-precision monitoring of the experimental process.

[0046] 4. The fatigue life assessment test platform for an elastic ring type squeeze film damper provided by the present invention further precisely regulates the loading state of the test piece through the control system and the pressure regulating valve, realizing a high degree of automation of the test bench.

[0047] 5. The fatigue life assessment test platform for an elastic ring type squeeze film damper provided by the present invention realizes the loading of the test bench through the exciting vibrator and the cylinder, and the vibration platform integration and the monitoring and control system are separated, so as to realize the high safety of the test platform.

[0048] In summary, the technical solution of the present invention is applied to solve the problems in the prior art that the exciting vibrator type test bench loads the load through the basic excitation method, it is difficult to simulate the actual working conditions of the elastic ring, and the accuracy of the experimental results cannot be guaranteed; the rotor type test bench can better simulate the actual working conditions through the high-speed rotor, but it has high requirements for the accuracy of the test bench, is expensive, and it is difficult to guarantee safety, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] 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 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, other drawings can be obtained based on these drawings without creative efforts.

[0050] Figure 1 It is a schematic structural diagram of the present invention;

[0051] Figure 2 It is a schematic connection structure diagram of the monitoring and control system and the oil supply system of the present invention.

[0052] In the figure: 1. Basic platform; 2. Cylinder; 3. Vibrator; 4. Force sensor; 5. Oil baffle bracket; 6. Oil baffle; 7. Inner support ring; 8. Elastic ring; 9. Displacement sensor; 10. Outer support ring; 11. Displacement sensor bracket; 12. Inner support ring bracket; 13. Lateral column; 14. Squirrel-cage elastic support; 15. Protective cover; 16. Oil retaining ring; 17. Bottom plate; 18. T-shaped slider; 19. Control system; 20. Power amplifier; 21. Pressure regulating valve; 22. Air compressor; 23. Monitoring system; 24. Data acquisition card; 25. Oil supply system. Specific embodiments

[0053] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0054] 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The description of at least one exemplary embodiment below is actually only illustrative and in no way restricts the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0056] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be clear that, for the sake of convenience in description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0057] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are usually based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the protection scope of the present invention: the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0058] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" etc. can be used here to describe the spatial positional relationships between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0059] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, the above words have no special meanings. Therefore, it cannot be understood as a limitation on the protection scope of the present invention.

[0060] Such as Figure 1As shown in the figure, the present invention provides a fatigue life assessment test platform for an elastic ring type squeeze film damper, which includes: a basic platform 1, an exciter 3, a vibration platform assembly, an oil supply system, and a monitoring and control system;

[0061] On the top surface of the basic platform 1, there are multiple parallel inverted T-shaped assembly slides, and T-shaped sliders 18 are arranged in the slides for assembling the vibration platform assembly and the exciter 3.

[0062] The exciter 3 is arranged on the upper part of the basic platform, on one side of the vibration platform assembly, and is connected to the vibration platform assembly through a screw;

[0063] The vibration platform assembly includes: a cylinder 2, a force sensor 4, an oil baffle support 5, an oil baffle 6, an inner support ring 7, an elastic ring 8, a displacement sensor 9, an outer support ring 10, a displacement sensor support 11, an inner support ring support 12, a lateral column 13, a cage type elastic support 14, a protective cover 15, an oil retaining ring 16, a bottom plate 17, and a T-shaped slider 18; the bottom plate 17 is connected to the T-shaped slider 18 through bolts, and the vibration platform assembly is installed on the upper part of the basic platform 1; the inner support ring 7 is fixedly installed on the top of the inner support ring support 12 through bolts; the inner support ring support 12 is arranged on the upper part of the bottom plate 17 and is fixed through bolts; the cage type elastic support 14 is arranged on the outside of the inner support ring support 12, coaxially fixed with the inner support ring support 12, and the outer support ring 10 is fixedly installed on its upper part through bolts; the elastic ring 8 is arranged between the inner support ring 7 and the outer support ring 10 and is positioned by a pin; two radial positions of the elastic ring 8 are provided; the oil baffle support 5 is fixedly installed on the upper part of the inner support ring 7 through bolts, and an oil baffle 6 is arranged on its upper part; the oil retaining ring 16 is arranged on the outside of the cage type elastic support 14 and is fixedly installed on the upper part of the bottom plate 17 through bolts, and a sealing ring is arranged at the connection between it and the bottom plate 17; the protective cover 15 is arranged between the cage type elastic support 14 and the oil retaining ring 16; the lateral column 13 is installed on the outside of the oil retaining ring 16 and is fixedly installed on the bottom plate 17 through bolts; lifting eye bolts are arranged on both the lateral column 13 and the oil retaining ring 16 for the handling and installation of the test bench; there are two cylinders 2, arranged on the lateral column 13, and connected to the outer support ring 10 through a screw for applying a radial force to the elastic ring 8; the displacement sensor support 11 is arranged on the lateral column 13 opposite to the cylinder 2, and a displacement sensor 9 is arranged on it. There are two displacement sensors 9, arranged on the lateral column 13 at the position opposite to the cylinder 2, arranged opposite to the cylinder 2, for collecting displacement data during the test; the force sensor 4 is arranged at the connection between the exciter 3 and the outer support ring 10 and at the connection between the cylinder 2 and the outer support ring 10 for collecting force data during the test.

[0064] As Figure 2As shown, the oil supply system 25 is integrally connected to the vibrating platform through an oil pipe, and supplies oil to the elastic ring 8 through the oil grooves formed on the inner support ring 7 and the outer support ring 10.

[0065] As Figure 2 shown, the monitoring and control system is remotely connected to the exciter 3 and the vibrating platform through a data line and an air pipe. The monitoring and control system includes: a control system 19, a power amplifier 20, a pressure regulating valve 21, an air compressor 22, a detection system 23, and a data acquisition card 24; the detection system 23 is respectively connected to the force sensor 4 and the displacement sensor 9 through the data acquisition card 24; the control system 19 is connected to the exciter 23 through the power amplifier 20; the air compressor 22 is connected to the air cylinder 2 through the pressure regulating valve 21.

[0066] 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 recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An elastic ring type squeeze film damper fatigue life assessment test platform, characterized in that: The elastic ring type squeeze film damper fatigue life assessment test platform includes: a base platform (1), an exciter (3), a vibration platform integration, an oil supply system, and a monitoring and control system; The vibration platform integration is arranged on the upper part of the base platform (1); the vibration platform integration includes: a cylinder (2), a force sensor (4), an oil baffle support (5), an oil baffle (6), an inner support ring (7), an elastic ring (8), a displacement sensor (9), an outer support ring (10), a displacement sensor support (11), an inner support ring support (12), a lateral column (13), a squirrel cage elastic support (14), a protective cover (15), an oil retaining ring (16), a bottom plate (17), a T-shaped slider (18); the bottom plate (17) is connected to the T-shaped slider (18) by bolts, and the vibration platform integration is installed on the upper part of the base platform (1); the inner support ring (7) is fixedly installed on the top of the inner support ring support (12) by bolts; the inner support ring support (12) is arranged on the upper part of the bottom plate (17) and fixed by bolts; the squirrel cage elastic support (14) is arranged outside the inner support ring support (12), coaxially fixed with the inner support ring support (12), and the outer support ring (10) is fixedly installed on its upper part by bolts; the elastic ring (8) is arranged between the inner support ring (7) and the outer support ring (10) and positioned by a pin; the oil baffle support (5) is fixedly installed on the upper part of the inner support ring (7) by bolts, and an oil baffle (6) is arranged on its upper part; the oil retaining ring (16) is arranged outside the squirrel cage elastic support (14) and fixedly installed on the upper part of the bottom plate (17) by bolts, and a sealing ring is arranged at the connection between it and the bottom plate (17); the protective cover (15) is arranged between the squirrel cage elastic support (14) and the oil retaining ring (16); the lateral column (13) is installed outside the oil retaining ring (16) and fixedly installed on the bottom plate (17) by bolts; the cylinder (2) is arranged on the lateral column (13) and connected to the outer support ring (10) by a screw rod for applying a radial force to the elastic ring (8); the displacement sensor support (11) is arranged on the lateral column (13) opposite to the cylinder (2), and a displacement sensor (9) is arranged on it for collecting displacement data during the test; the force sensor (4) is arranged at the connection between the exciter (3) and the outer support ring (10) and at the connection between the cylinder (2) and the outer support ring (10) for collecting force data during the test; The exciter (3) is arranged on the upper part of the base platform, on one side of the vibration platform integration, and is connected to the vibration platform integration by a screw rod; The oil supply system (25) is connected to the vibration platform integration through a pipeline; The described monitoring and control system is remotely connected through a data cable integrated with an air pipe, an exciter (3), and a vibration platform; the monitoring and control system includes: a control system (19), a power amplifier (20), a pressure regulating valve (21), an air compressor (22), a detection system (23), and a data acquisition card (24); the detection system (23) is respectively connected to a force sensor (4) and a displacement sensor (9) through the data acquisition card (24); the control system (19) is connected to the exciter (23) through the power amplifier (20); the air compressor (22) is connected to the cylinder (2) through the pressure regulating valve (21).

2. The fatigue life assessment test platform for an elastic ring type squeeze film damper according to claim 1, characterized in that: On the top surface of the base platform (1), there are multiple parallel inverted T-shaped assembly slides, and T-shaped sliders (18) are arranged in the slides for assembling the vibration platform integration and the exciter (3).

3. The fatigue life assessment test platform for an elastic ring type squeeze film damper according to claim 1, characterized in that: There are two exciters (3), which are distributed at the radial positions of the elastic ring (8).

4. The fatigue life assessment test platform for an elastic ring type squeeze film damper according to claim 1, characterized in that: There are two cylinders (2), which are arranged on two adjacent lateral columns (13); There are two displacement sensors (9), which are arranged on the lateral columns (13) at the opposite positions of the cylinders (2) and are arranged opposite to the cylinders (2).

5. The fatigue life assessment test platform for an elastic ring type squeeze film damper according to claim 1, characterized in that: The oil supply system (25) is connected to the vibration platform integration through an oil pipe, and supplies oil to the elastic ring (8) through the oil grooves opened on the inner support ring (7) and the outer support ring (10).

6. The fatigue life assessment test platform for an elastic ring type squeeze film damper according to claim 1, characterized in that: Lifting eye bolts are provided on both the lateral columns (13) and the oil retaining ring (16) for the handling and installation of the test bench.

Images