Flexible support combined contact rod-piston rotor dry friction damping experiment table and experimental method

Abstract

The application discloses a flexible supporting combined contact pull rod rotor dry friction damping experiment table and an experiment method, and belongs to the technical field of experiment equipment. The flexible supporting characteristic of the experiment table is realized through the interaction between the flexible supporting support, the dynamic friction sheet and the static friction sheet element, so that the dynamic characteristics under different supporting stiffness and pre-tightening force states are simulated. The effective control of the axial vibration is realized, and the vibration of the rotor is reduced through the friction effect between the dynamic and static friction sheets and the axial displacement control of the stepping motor for adjusting the normal pressure of the contact surface. Meanwhile, the combined pull rod rotor is assembled through the stop opening cooperation and the end surface tooth contact cooperation, and can be used for the research on the coupling characteristics of the stop opening plane and the end surface tooth interface parameters. The contact state of the end surface tooth can be simulated under different working conditions through the contact cooperation of the end surface tooth in the combined wheel disc, so that the analysis and research on the different contact states of the end surface tooth can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of experimental equipment, and in particular to a flexible support combined contact pull rod rotor dry friction vibration reduction experimental platform and an experimental method. Background Art

[0002] As heavy-duty gas turbine speeds and temperatures continue to climb, ensuring the structural integrity and reliability of rod-tethered rotors is crucial for the development of new, high-efficiency, low-emission gas turbines. While extensive and in-depth research experience has been accumulated in the field of rod-tethered rotors for gas turbines, current design processes and experimental data are insufficient to fully support independent research and development. Therefore, experimentally based rod-tethered rotor preload design and structural strength vibration assessment are particularly important.

[0003] The vibrations generated by rod-type rotors during operation not only affect the safety and stability of unit operation but can also damage components and shorten unit life. With the rapid development of modern industry and society, higher demands are being placed on the safety and stability of rotor system operation, as well as the working and living environment of associated personnel. Therefore, vibration reduction analysis and research on rotor systems is crucial for achieving safe and stable rotor system operation and improving the working environment.

[0004] As an efficient means of vibration reduction, dry friction damping has long demonstrated wide applicability in various applications. Specifically, the patent document CN200410073346.0 introduces an innovative rotor vibration test device with flexible support. The device cleverly achieves precise control of the damping performance by adjusting the pressure value applied to the dynamic and static friction plates. This design not only improves the vibration reduction effect, but also enhances the flexibility and accuracy of the test. Furthermore, CN202011197962.2 proposes a compact main-controlled spring-supported dry friction damper based on a piezoelectric ceramic actuator. This solution specifically solves the key problems commonly found in traditional dry friction dampers, such as insufficient parallelism of the dynamic and static friction plates, difficulty in discharging debris, and easy penetration of lubricating oil into the damper, providing a new solution for engine rotor vibration reduction applications.

[0005] However, although these schemes have made some progress in structure and application, there is still a lot of room for exploration in the study of the characteristics of dry friction dampers, especially the interface mechanical properties between the dynamic and static friction plates, which has a crucial impact on the effectiveness of vibration reduction control.

[0006] Therefore, how to provide a flexible support combined contact pull rod rotor dry friction vibration reduction test bench for studying the vibration reduction effect of dynamic and static friction plates has become a technical problem that needs to be overcome urgently by current technical personnel in this field. Summary of the Invention

[0007] The object of the present invention is to provide a flexible support combined contact rod rotor dry friction vibration reduction test bench and test method, so as to overcome at least one technical problem existing in the prior art.

[0008] The present invention solves the above technical problems through the following technical solutions:

[0009] A flexible support combined contact rod rotor dry friction vibration reduction test bench comprises a base plate, a combined rod rotor, a drive motor and a flexible support assembly, wherein:

[0010] The flexible support assembly includes a pressure sensor, a static friction plate, a dynamic friction plate and a flexible support. An axially movable slide module is fixedly arranged on the base plate. A flexible support support is arranged on the slider of the slide module. A non-driving side safety protection base, a driving side safety protection base and a motor base are arranged in sequence above the base plate along the flexible support support. A non-driving side flexible support bearing seat is arranged inside the non-driving side safety protection base, and a driving side flexible bearing seat is arranged inside the driving side safety protection base. The flexible support is fixedly connected to the flexible support support via the pressure sensor, the static friction plate is fixedly connected to the non-driving side flexible support bearing seat, and the dynamic friction plate is fixedly connected to the flexible support.

[0011] The combined pull-rod rotor includes a non-driving side shaft head, a combined wheel disc and a driving side shaft head which are arranged in sequence. The non-driving side shaft head passes through the non-driving side flexible support bearing seat, the static friction plate, the dynamic friction plate and the flexible support in sequence.

[0012] The drive motor is fixedly installed on the outside of the motor base. The output shaft of the drive motor passes through the motor base and is connected to the motor side flexible coupling. The motor side flexible coupling passes through the drive side flexible bearing seat and is connected to the drive side shaft head.

[0013] Furthermore, the combined wheel specifically comprises a first arc-shaped toothed wheel, a second arc-shaped toothed wheel, a third arc-shaped toothed wheel and a fourth arc-shaped toothed wheel which are arranged in sequence. The non-driving side shaft head is connected to the first arc-shaped toothed wheel by means of a stopper, and the fourth arc-shaped toothed wheel is connected to the driving side shaft head by means of a stopper. Adjacent arc-shaped toothed wheels are connected by end face teeth. The non-driving side shaft head and the driving side shaft head are provided with a number of corresponding connecting holes along the circumferential direction. The combined pull rod rotor also includes a circumferential pull rod, which passes through the connecting hole to achieve a pre-tightened connection of the combined wheel.

[0014] Furthermore, a first eddy current sensor bracket and a second eddy current sensor bracket are sequentially arranged above the base bottom plate between the non-driving side safety protection base and the driving side safety protection base, the third arc-shaped gear disc and the fourth arc-shaped gear disc are fixedly arranged inside the second eddy current sensor bracket, the first arc-shaped gear disc and the second arc-shaped gear disc are fixedly arranged inside the first eddy current sensor bracket, a plurality of driving side tie rod rotor eddy current sensors are arranged on the top of the second eddy current sensor bracket, and a plurality of non-driving side tie rod rotor eddy current sensors are arranged on the top of the first eddy current sensor bracket.

[0015] Furthermore, auxiliary components are provided on the circumference of the first arc-shaped gear plate and the fourth arc-shaped gear plate. The auxiliary components are provided with connecting holes corresponding to the non-driving side shaft head along the circumferential direction, and two adjacent connecting holes are provided with balancing screw holes for achieving dynamic balancing of the combined pull-rod rotor.

[0016] Furthermore, a driving side bearing seat acceleration sensor is provided above the driving side flexible bearing seat and passes through the top of the driving side safety protection base; a non-driving side bearing seat acceleration sensor is provided above the non-driving side flexible support bearing seat and passes through the top of the non-driving side safety protection base.

[0017] Furthermore, the diameter of the balancing screw hole is 6 mm, and the number of circumferential tie rods is 12.

[0018] Furthermore, the non-driving side flexible support bearing seat and the driving side flexible bearing seat are respectively welded by ribs with different stiffness in the horizontal and vertical directions; the basic bottom plate is connected to the T-slot foundation by bolts, and the foundation is subjected to vibration isolation treatment.

[0019] Furthermore, the thickness of the combined wheel disc is 134 mm, and the diameters of the non-driving side shaft head and the driving side shaft head are both 20 mm.

[0020] Furthermore, the outer diameter of the arc-shaped gear disc ranges from 140 to 180 mm, and the number of teeth is 48.

[0021] An experimental method for a flexible support combined contact rod rotor dry friction vibration reduction test bench adopts the above-mentioned flexible support combined contact rod rotor dry friction vibration reduction test bench, starts the driving motor, and promotes the combined rod rotor to rotate through the motor side flexible coupling, and performs stiffness asymmetric fault dynamics testing by adjusting the rod preload size and phase of the combined rod rotor, measures the vibration acceleration signals of the driving side flexible bearing seat and the non-driving side flexible support bearing seat through the driving side bearing seat acceleration sensor and the non-driving side bearing seat acceleration sensor, and measures the shaft diameter vibration response through the driving side rod rotor eddy current sensor and the non-driving side rod rotor eddy current sensor; starts the slide module, uses the pressure sensor to detect the contact surface positive pressure of the dynamic friction plate and the static friction plate, controls the axial displacement of the flexible support through the stepper motor, adjusts the contact surface positive pressure, and controls the axial vibration.

[0022] Compared with the prior art, the present invention has the following positive effects:

[0023] The flexible support combined contact rod rotor dry friction vibration reduction test bench provided by this invention achieves flexible support characteristics through the interaction between the flexible support support, dynamic friction plates, and static friction plates, thereby simulating dynamic characteristics under different support stiffness and preload conditions. Through the friction between the dynamic and static friction plates, a stepper motor controls axial displacement to adjust the normal pressure on the contact surface, effectively controlling axial vibration and reducing rotor vibration. The non-drive side safety protection base and the drive side safety protection base absorb and dissipate vibration energy, reducing the stress on key components (such as the bearing seat and rotor). This not only extends the service life of these key components, but also reduces wear and fatigue caused by vibration, improving the reliability and durability of the entire system.

[0024] Furthermore, the combined tie-rod rotor is assembled through the stop fit and the end face tooth contact fit, which can be used to study the coupling characteristics of the stop plane and the end face tooth interface parameters; by combining the contact fit of the end face teeth in the wheel, the contact state of the end face teeth can be simulated under different working conditions, thereby realizing the analysis and study of different contact states of the end face teeth.

[0025] Furthermore, a balancing screw hole is provided to allow fine adjustment during the operation of the rotor to ensure that it achieves dynamic balance during rotation and reduce vibration caused by imbalance.

[0026] Furthermore, the acceleration sensor can detect the vibration of the bearing and help analyze the dynamic response characteristics of the rotor under different working conditions.

[0027] Furthermore, the design of the non-drive-side and drive-side flexible bearing seats takes into account the design critical speed. The support stiffness is varied by adjusting the thickness of the ribs. This also achieves anisotropy in the bearing seats, with different stiffness in the horizontal and vertical directions. This design enables measurement of a total of four critical speeds in the horizontal and vertical directions within the motor's maximum operating speed range. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] Figure 1 It is a structural schematic diagram of the present invention;

[0030] Figure 2 A detailed schematic diagram of the structural pull-rod rotor of the present invention;

[0031] Figure 3 Detailed schematic diagram of the dynamic and static friction plates of the present invention;

[0032] Figure 4 The structure of the present invention is a cross-sectional view of a rod rotor.

[0033] Among them, 1 is the base plate; 2 is the slide module; 3 is the flexible support; 4 is the pressure sensor; 5 is the flexible support; 6 is the static friction plate; 7 is the dynamic friction plate; 8 is the non-drive side flexible support bearing seat; 9 is the non-drive side safety protection base; 10 is the combined pull rod rotor; 11 is the first eddy current sensor bracket; 12 is the second eddy current sensor bracket; 13 is the drive side flexible bearing seat; 14 is the drive side safety protection base; 15 is the motor side flexible coupling; 16 is the motor base; 1 7 is a driving motor; 18 is a driving side bearing seat acceleration sensor; 19 is a driving side tie rod rotor eddy current sensor; 20 is a non-driving side tie rod rotor eddy current sensor; 21 is a non-driving side bearing seat acceleration sensor; 22 is a non-driving side shaft head; 23 is a circumferential tie rod; 24 is a balancing screw hole; 25 is a first arc-shaped toothed disc; 26 is a second arc-shaped toothed disc; 27 is a third arc-shaped toothed disc; 28 is a fourth arc-shaped toothed disc; 29 is a driving side shaft head; 30 is a connecting hole; 31 is an auxiliary component. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0037] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, which are intended to explain the present invention rather than to limit it.

[0040] See also Figure 1 A flexible support combined contact rod rotor dry friction vibration reduction test bench includes a base plate 1, a combined rod rotor 10, a drive motor 17 and a flexible support assembly, wherein:

[0041] The flexible support assembly includes a pressure sensor 4, a static friction plate 6, a dynamic friction plate 7 and a flexible support 5. An axially movable slide module 2 is fixedly provided on the base plate 1. A flexible support support 3 is provided on the slider of the slide module 2. A non-driving side safety protection base 9, a driving side safety protection base 14 and a motor base 16 are sequentially provided above the base plate 1 along the flexible support support 3. A non-driving side flexible support bearing seat 8 is provided inside the non-driving side safety protection base 9, and a driving side flexible bearing seat 13 is provided inside the driving side safety protection base 14; the flexible support 5 is fixedly connected to the flexible support support 3 via the pressure sensor 4, the static friction plate 6 is fixedly connected to the non-driving side flexible support bearing seat 8, and the dynamic friction plate 7 is fixedly connected to the flexible support 5;

[0042] The combined pull-rod rotor 10 includes a non-driving side shaft head 22, a combined wheel disc, and a driving side shaft head 29, which are arranged in sequence. The non-driving side shaft head 22 passes through the non-driving side flexible support bearing seat 8, the static friction plate 6, the dynamic friction plate 7, and the flexible support 5 in sequence.

[0043] The drive motor 17 is fixedly mounted on the outer side of the motor base 16 . The output shaft of the drive motor 17 passes through the motor base 16 to connect to the motor-side flexible coupling 15 . The motor-side flexible coupling 15 passes through the drive-side flexible bearing seat 13 to connect to the drive-side shaft head 29 .

[0044] In the present invention, combined contact refers to the flexible support characteristics of the rod rotor test bench achieved through the interaction between the flexible support bracket 3, the dynamic friction plate 7, and the static friction plate 6. This enables the system to incorporate the characteristics of flexible support into the test bench structure. This means that during operation, the system can exhibit the dynamic response of a flexible support, rather than simply the characteristics of a rigid support. Specifically, combined contact involves multi-level contact relationships between the flexible support, the static friction plate, and the dynamic friction plate. This design enables the test bench to simulate the dynamic characteristics under different support stiffness and preload conditions, covering modal experiments with both rigid and flexible supports, thereby more comprehensively understanding and optimizing the dynamic characteristics of the rod rotor and making experiments more closely aligned with actual operating conditions.

[0045] This test bench effectively controls axial vibration and reduces rotor vibration by leveraging the friction between the dynamic and static friction plates. This stepper motor controls axial displacement to adjust the contact pressure, effectively reducing rotor vibration. This friction damping mechanism reduces the stress on each component and extends the life of the equipment. Furthermore, the static and dynamic friction plates are easily replaceable. By varying the friction interface parameters, such as material, roughness, and the presence of lubricant, the damping characteristics are determined through numerical processing using pressure sensors and eddy current sensors. This, combined with varying the positive pressure parameters, yields the optimal vibration-reducing friction parameters.

[0046] Furthermore, the present invention addresses safety concerns arising from excessive vibration caused by various fault conditions and exceeding critical speeds. The non-drive-side safety protection base 9 and the drive-side safety protection base 14 are designed to absorb and disperse vibration energy, reducing stress on key components such as the bearing seat and rotor. This not only extends the service life of these key components but also reduces wear and fatigue caused by vibration, thereby improving the reliability and durability of the entire system.

[0047] See also Figure 2 and Figure 4 The combined wheel specifically comprises a first arc-shaped toothed disc 25, a second arc-shaped toothed disc 26, a third arc-shaped toothed disc 27 and a fourth arc-shaped toothed disc 28, which are arranged in sequence. The non-driving side shaft head 22 is connected to the first arc-shaped toothed disc 25 through a stopper, and the fourth arc-shaped toothed disc 28 is connected to the driving side shaft head 29 through a stopper. Adjacent arc-shaped toothed discs are connected through end face teeth. The non-driving side shaft head 22 and the driving side shaft head 29 are each provided with a number of corresponding connecting holes 30 along the circumferential direction. The combined pull-rod rotor 10 also includes a circumferential pull rod 23, which passes through the connecting hole 30 to achieve a pre-tightened connection of the combined wheel.

[0048] The combined pull-rod rotor is composed of four arc-shaped gear discs, a non-drive side shaft head and a drive side shaft head assembled through the stop fit and the end face tooth contact fit. It can be used to study the coupling characteristics of the stop plane and the end face tooth interface parameters; through the contact fit of the end face teeth in the combined wheel, the contact state of the end face teeth can be simulated under different working conditions, thereby enabling the analysis and study of different contact states of the end face teeth; through flexible support, the dynamic characteristics of rigid support and flexible support under different support stiffness can be simulated; and the experimental platform is equipped with a protective bracket and a limit bracket, which can effectively prevent the pull-rod rotor from being damaged during the experiment.

[0049] See also Figure 3The flexible support is located on the base plate of the experimental platform, responsible for supporting the entire rotor structure, and is connected to a pressure sensor to monitor pressure changes. The pressure sensor is used to monitor the pressure applied to the flexible support in real time to evaluate the contact state of the friction plate and the vibration reduction effect. On the non-driving side, the flexible support is fixedly connected to the static friction plate. The dynamic friction plate is arranged on the non-driving side shaft head and contacts the static friction plate during rotation, achieving vibration reduction through friction. The dynamic friction plate is connected to the flexible support through a threaded hole to facilitate the replacement of the dynamic friction plate 7. The static friction plate 6 is connected to the non-driving side flexible support bearing seat 8 through bolts to facilitate the replacement of the static friction plate 6. In the present invention, the control of axial vibration is achieved by arranging a friction plate on one side of the flexible support, installing a flexible support with a friction surface on the rotor limit seat, and controlling the axial displacement of the stepper motor of the slide module 2 to adjust the positive pressure of the contact surface. The pressure can be detected by the pressure sensor 4 installed on the flexible support. This design absorbs and dissipates vibration energy, thereby reducing the system's amplitude and vibration amplitude-frequency response, effectively reducing the vibration and impact of the test bench, thereby alleviating the stress on each component, extending the service life of the equipment, and improving the stability of the mechanical system.

[0050] Specifically, a first eddy current sensor bracket 11 and a second eddy current sensor bracket 12 are sequentially arranged above the base base 1 between the non-driving side safety protection base 9 and the driving side safety protection base 14. The third arc-shaped toothed disc 27 and the fourth arc-shaped toothed disc 28 are fixedly arranged inside the second eddy current sensor bracket 12. The first arc-shaped toothed disc 25 and the second arc-shaped toothed disc 26 are fixedly arranged inside the first eddy current sensor bracket 11. A plurality of driving side tie rod rotor eddy current sensors 19 are arranged on the top of the second eddy current sensor bracket 12, and a plurality of non-driving side tie rod rotor eddy current sensors 20 are arranged on the top of the first eddy current sensor bracket 11. The eddy current sensor is used to measure the response displacement of the rotor and can monitor the dynamic characteristics of the rotor.

[0051] In a specific embodiment of the present invention, auxiliary components 31 are provided on the circumference of the first arc-shaped toothed disc 25 and the fourth arc-shaped toothed disc 28. The auxiliary components 31 are provided with connecting holes 30 corresponding to the non-drive side shaft head 22 along the circumferential direction. The two adjacent connecting holes 30 are provided with balancing screw holes 24 for achieving dynamic balancing of the combined pull-rod rotor 10; fine-tuning is allowed during the operation of the rotor to ensure that it achieves dynamic balance during rotation and reduce vibration caused by imbalance.

[0052] Specifically, a driving side bearing seat acceleration sensor 18 is provided above the driving side flexible bearing seat 13 and passes through the top of the driving side safety protection base 14; a non-driving side bearing seat acceleration sensor 21 is provided above the non-driving side flexible support bearing seat 8 and passes through the top of the non-driving side safety protection base 9; the acceleration sensor can detect the vibration of the bearing and help analyze the dynamic response characteristics of the rotor under different working conditions.

[0053] Specifically, the diameter of the balancing screw holes 24 is 6 mm, and there are 12 circumferential tie rods 23. The combined wheel discs are pre-tightened and connected by 12 circumferential tie rods (which can be short bolts) evenly distributed around the circumference, forming a distributed pre-tightened tie rod rotor structure. Twelve M6 balancing screw holes 24 are evenly distributed along the outer diameter of the first and fourth arcuate toothed discs 25 and 28, respectively, for dynamic balancing of the rotor. By varying the tie rod pre-tightening force, asymmetric pre-tightening can be achieved and experiments simulating fault conditions such as loose bolts at different phases can be performed.

[0054] Specifically, the non-drive-side flexible support bearing seat 8 and the drive-side flexible support bearing seat 13 are welded from ribs with different horizontal and vertical stiffnesses, respectively. The base plate 1 is bolted to the T-slot foundation, which is treated for vibration isolation. The bearing seat design takes into account the design critical speed, adjusting the support stiffness by adjusting the thickness of the ribs. This also achieves anisotropy in the bearing seat, i.e., different stiffness in the horizontal and vertical directions. This design enables measurement of a total of four critical speeds in the horizontal and vertical directions within the motor's maximum operating speed range.

[0055] In a specific embodiment of the present invention, the outer diameter of the four arc-shaped toothed discs of the combined pull-rod rotor 10 is 140-180 mm. Figure 4 The combined wheel is formed by four arc-shaped toothed discs through end face tooth contact with 48 teeth. The non-driving side shaft head 22 and the driving side shaft head 29 are assembled with the combined wheel through the stop mouth to form a combined pull-rod rotor. The thickness of the combined wheel composed of four arc-shaped toothed discs is 134mm; the diameter of the non-driving side shaft head 22 and the driving side shaft head 29 is 20mm, the power of the drive motor 17 is 1.5kw, and the maximum continuous operating speed is 10000rpm.

[0056] The present invention provides an experimental method for a flexible support combined contact rod rotor dry friction vibration reduction test bench. The method adopts the above-mentioned flexible support combined contact rod rotor dry friction vibration reduction test bench, starts the driving motor 17, and pushes the combined rod rotor 10 to rotate through the motor side flexible coupling 15. By adjusting the size and phase of the rod preload of the combined rod rotor 10, a stiffness asymmetric fault dynamics test is performed. The vibration acceleration signals of the driving side flexible bearing seat 13 and the non-driving side flexible support bearing seat 8 are measured through the driving side bearing seat acceleration sensor 18 and the non-driving side bearing seat acceleration sensor 21. The shaft diameter vibration response is measured through the driving side rod rotor eddy current sensor 19 and the non-driving side rod rotor eddy current sensor 20. The slide module 2 is started, and the contact surface positive pressure of the dynamic friction plate 7 and the static friction plate 6 is detected by the pressure sensor 4. The axial displacement of the flexible support 5 is controlled by the stepping motor, the contact surface positive pressure is adjusted, and the axial vibration is controlled.

[0057] In the experiment, different support stiffnesses can be achieved by adjusting the material and geometric parameters of the flexible support. Specifically, flexible materials of different hardness or the thickness and number of the support ribs are used to observe the changes in the dynamic response of the rotor under different support stiffnesses. Specifically, by replacing the materials of different dynamic friction plates 5 and static friction plates 6, such as structural steel and titanium alloy materials, the mechanical behavior of the interfaces of different materials can be tested and analyzed; by changing the number of ribs welded on the non-driving side flexible support bearing seat 8 and the driving side flexible bearing seat 13, the anisotropy of stiffness can be achieved. In addition, by gradually reducing the preload of a certain pull rod, its influence on the dynamic characteristics of the rotor can be observed, including changes in modal frequency and transitions in vibration modes. In addition, adjustable unbalanced mass can be added to the rotor to simulate the mass imbalance in actual operation and study its influence on dynamic behavior under different speed conditions.

[0058] For ordinary technicians in the relevant technical field, after thoroughly reading and understanding the technical solutions of the present invention, they are fully capable of making various forms of changes, modifications or equivalent replacements to the specific implementation methods of the invention based on their own professional knowledge and skills. These changes may include but are not limited to: adjusting the value range of technical parameters, optimizing algorithm processes to improve efficiency, replacing some technical components to achieve better compatibility or reduce costs, etc. As long as these modified technical solutions still substantially maintain the technical features claimed for protection by the original invention, that is, they can still achieve the core functions and effects of the present invention, then these changes should be deemed to fall within the scope of protection of the pending claims of the present invention.

[0059] Furthermore, with the continuous advancement and development of technology, new technical means and methods continue to emerge, providing ample room for further improvement and perfection of the present invention. Therefore, the scope of protection of the present invention should also include reasonably foreseeable improvements and extensions based on existing technologies. As long as these improvements and extensions do not deviate from the basic principles and core concepts of the present invention, they should be considered equivalent to the present invention and equally protected by patent rights.

Claims

1. A flexible support combined contact rod rotor dry friction vibration reduction test bench, characterized in that: The invention comprises a base plate (1), a combined pull rod rotor (10), a drive motor (17) and a flexible support assembly, wherein the flexible support assembly comprises a pressure sensor (4), a static friction plate (6), a dynamic friction plate (7) and a flexible support (5); an axially movable slide module (2) is fixedly provided on the base plate (1); a flexible support support (3) is provided on the slider of the slide module (2); a non-driving side safety protection base (9), a driving side safety protection base (14) and a motor base (16) are sequentially provided above the base plate (1) along the flexible support support (3); a non-driving side flexible support bearing seat (8) is provided inside the non-driving side safety protection base (9); a driving side flexible bearing seat (13) is provided inside the driving side safety protection base (14); the flexible support (5) is fixedly connected to the flexible support support (3) via the pressure sensor (4); the static friction plate (6) is fixedly connected to the non-driving side flexible support bearing seat (8); and the dynamic friction plate (7) is fixedly connected to the flexible support (5); The combined pull rod rotor (10) comprises a non-driving side shaft head (22), a combined wheel disc and a driving side shaft head (29) which are arranged in sequence, wherein the non-driving side shaft head (22) passes through a non-driving side flexible support bearing seat (8), a static friction plate (6), a dynamic friction plate (7) and a flexible support (5) in sequence; the combined wheel disc is specifically a first arc-shaped toothed disc (25), a second arc-shaped toothed disc (26), a third arc-shaped toothed disc (27) and a fourth arc-shaped toothed disc (28) which are arranged in sequence; The drive motor (17) is fixedly mounted on the outside of the motor base (16), the output shaft of the drive motor (17) passes through the motor base (16) and is connected to the motor side flexible coupling (15), and the motor side flexible coupling (15) passes through the drive side flexible bearing seat (13) and is connected to the drive side shaft head (29); A first eddy current sensor bracket (11) and a second eddy current sensor bracket (12) are sequentially arranged above the base bottom plate (1) between the non-driving side safety protection base (9) and the driving side safety protection base (14); a third arc-shaped toothed disc (27) and a fourth arc-shaped toothed disc (28) are fixedly arranged inside the second eddy current sensor bracket (12); a first arc-shaped toothed disc (25) and a second arc-shaped toothed disc (26) are fixedly arranged inside the first eddy current sensor bracket (11); a plurality of driving side tie rod rotor eddy current sensors (19) are arranged on the top of the second eddy current sensor bracket (12); and a plurality of non-driving side tie rod rotor eddy current sensors (20) are arranged on the top of the first eddy current sensor bracket (11); A driving side bearing seat acceleration sensor (18) passing through the top of the driving side safety protection base (14) is provided above the driving side flexible bearing seat (13); a non-driving side bearing seat acceleration sensor (21) passing through the top of the non-driving side safety protection base (9) is provided above the non-driving side flexible support bearing seat (8).

2. The flexible support combined contact rod rotor dry friction vibration reduction test bench according to claim 1 is characterized in that: The non-driving side shaft head (22) is connected to the first arc-shaped toothed disc (25) through a stopper, and the fourth arc-shaped toothed disc (28) is connected to the driving side shaft head (29) through a stopper. Adjacent arc-shaped toothed discs are connected through end face teeth. The non-driving side shaft head (22) and the driving side shaft head (29) are each provided with a plurality of corresponding connection holes (30) along the circumferential direction. The combined pull rod rotor (10) further includes a circumferential pull rod (23), and the circumferential pull rod (23) passes through the connection hole (30) to achieve a pre-tightened connection of the combined wheel disc.

3. The flexible support combined contact rod rotor dry friction vibration reduction test bench according to claim 2, characterized in that: An auxiliary component (31) is provided on the circumference of the first arc-shaped toothed disc (25) and the fourth arc-shaped toothed disc (28). The auxiliary component (31) is provided with a connecting hole (30) corresponding to the non-driving side shaft head (22) along the circumferential direction. Two adjacent connecting holes (30) are provided with balancing screw holes (24) for achieving dynamic balancing of the combined pull-rod rotor (10).

4. The flexible support combined contact rod rotor dry friction vibration reduction test bench according to claim 3, characterized in that: The diameter of the balancing screw hole (24) is 6 mm, and the number of the circumferential pull rods (23) is 12.

5. The flexible support combined contact rod rotor dry friction vibration reduction test bench according to claim 1 is characterized in that: The non-driving side flexible support bearing seat (8) and the driving side flexible bearing seat (13) are respectively welded by ribs with different stiffness in the horizontal and vertical directions; the base plate (1) is connected to the T-slot foundation by bolts, and the foundation is subjected to vibration isolation treatment.

6. The flexible support combined contact rod rotor dry friction vibration reduction test bench according to claim 1 is characterized in that: The thickness of the combined wheel disc is 134 mm, and the diameters of the non-drive side shaft head (22) and the drive side shaft head (29) are both 20 mm.

7. The flexible support combined contact rod rotor dry friction vibration reduction test bench according to claim 1 is characterized in that: The outer diameter of the arc-shaped gear disc ranges from 140 to 180 mm, and the number of teeth is 48.

8. An experimental method for a flexible support combined contact rod rotor dry friction vibration reduction test bench, characterized in that: A flexible support combined contact rod rotor dry friction vibration reduction test bench as described in claim 1 is used to start the drive motor (17), and the combined rod rotor (10) is pushed to rotate through the motor side flexible coupling (15). The stiffness asymmetric fault dynamic test is performed by adjusting the rod preload size and phase of the combined rod rotor (10). The vibration acceleration signals of the driving side flexible bearing seat (13) and the non-driving side flexible support bearing seat (8) are measured through the driving side bearing seat acceleration sensor (18) and the non-driving side bearing seat acceleration sensor (21). The shaft diameter vibration response is measured through the driving side rod rotor eddy current sensor (19) and the non-driving side rod rotor eddy current sensor (20); the slide module (2) is started, and the contact surface positive pressure of the dynamic friction plate (7) and the static friction plate (6) is detected by the pressure sensor (4). The axial displacement of the flexible support (5) is controlled by the stepper motor, the contact surface positive pressure is adjusted, and the axial vibration is controlled.

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