Flexible support combined contact pull rod rotor dry friction vibration reduction experiment table and experiment method

Abstract

The invention discloses a rotor dry friction vibration reduction experiment table with flexible supports and combined contact pull rods and an experiment method, and belongs to the technical field of experiment equipment. According to the invention, through the interaction among the flexible bearing support, the dynamic friction plate and the static friction plate, the flexible bearing characteristic of the experiment table is realized, so that the dynamic characteristics under different bearing rigidities and pre-tightening force states are simulated; through the friction effect between the movable friction plate and the static friction plate, the stepping motor is used for controlling axial displacement so as to adjust the positive pressure of the contact face, effective control over axial vibration is achieved, and vibration of the rotor is reduced. Meanwhile, the combined pull rod rotor is assembled through seam allowance fit and end face tooth contact fit, and can be used for research on seam allowance plane and end face tooth interface parameter coupling characteristics; through the contact cooperation of the end face teeth in the combined wheel disc, the contact state of the end face teeth can be simulated under different working conditions, so that the analysis and research of different contact states of the end face teeth 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 rod rotor dry friction vibration reduction experimental platform and an experimental method. Background Art

[0002] As the speed and temperature of heavy-duty gas turbines continue to rise, ensuring the structural integrity and reliability of the rod rotor is crucial to promoting the development of new high-efficiency, low-emission gas turbines. At present, the field of gas turbine rod rotors has accumulated long-term and in-depth research experience, but the current design process and experimental data are not sufficient to fully support the needs of independent research and development. Therefore, the rod rotor preload design and structural strength vibration assessment based on experimental research are particularly important.

[0003] The vibration generated by the rod-type rotor during operation will not only affect the safety and stability of the unit operation, but may also cause damage to components and shorten the life of the unit. With the rapid development of modern industry and society, people have put forward higher requirements for the safety and stability of the rotor system operation and the working and living environment of related personnel. Therefore, vibration reduction analysis and research on the rotor system is of great significance for achieving safe and stable operation of the rotor system and improving the working environment.

[0004] As a highly 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 control 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 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 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 urgently overcome 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 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: 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: 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 bottom 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 bottom 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; The combined pull-rod rotor comprises a non-driving side shaft head, a combined wheel disc and a driving side shaft head which are arranged in sequence, and the non-driving side shaft head passes through a non-driving side flexible support bearing seat, a static friction plate, a dynamic friction plate and a flexible support in sequence; The driving motor is fixedly installed on the outer side of the motor base, the output shaft of the driving motor passes through the motor base to connect with the motor side flexible coupling, and the motor side flexible coupling passes through the driving side flexible bearing seat to connect with the driving side shaft head.

[0009] Furthermore, the combined wheel specifically comprises a first arc-shaped toothed plate, a second arc-shaped toothed plate, a third arc-shaped toothed plate and a fourth arc-shaped toothed plate which are arranged in sequence, the non-driving side shaft head is connected to the first arc-shaped toothed plate by means of a stopper, the fourth arc-shaped toothed plate is connected to the driving side shaft head by means of a stopper, adjacent arc-shaped toothed plates are connected by end face teeth, a number of corresponding connecting holes are arranged on the non-driving side shaft head and the driving side shaft head along the circumferential direction, and 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.

[0010] 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 plate and the fourth arc-shaped gear plate are fixedly arranged inside the second eddy current sensor bracket, the first arc-shaped gear plate and the second arc-shaped gear plate 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.

[0011] Furthermore, auxiliary components are provided on the circumference of the first arc-shaped toothed disc and the fourth arc-shaped toothed disc. The auxiliary components are provided with connecting holes corresponding to the non-driving side shaft heads along the circumferential direction. Two adjacent connecting holes are provided with balancing screw holes for achieving dynamic balancing of the combined pull-rod rotor.

[0012] Furthermore, a driving side bearing seat acceleration sensor is arranged 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 arranged above the non-driving side flexible support bearing seat and passes through the top of the non-driving side safety protection base.

[0013] Furthermore, the diameter of the balancing screw hole is 6 mm, and the number of the circumferential tie rods is 12.

[0014] 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 base bottom plate is connected to the T-slot foundation by bolts, and the foundation is treated with vibration isolation.

[0015] 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.

[0016] Furthermore, the outer diameter of the arc-shaped toothed disc ranges from 140 to 180 mm, and the number of teeth is 48.

[0017] 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 a driving motor, and drives the combined rod rotor to rotate through a motor side flexible coupling, and performs a stiffness asymmetric fault dynamic test by adjusting the size and phase of the rod preload of the combined rod rotor, and measures the vibration acceleration signals of the driving side flexible bearing seat and the non-driving side flexible support bearing seat through a driving side bearing seat acceleration sensor and a non-driving side bearing seat acceleration sensor, and measures the shaft diameter vibration response through a driving side rod rotor eddy current sensor and a non-driving side rod rotor eddy current sensor; starts a slide module, uses a pressure sensor to detect the contact surface positive pressure of a dynamic friction plate and a static friction plate, and controls the axial displacement of the flexible support through a stepper motor, adjusts the contact surface positive pressure, and controls the axial vibration.

[0018] Compared with the prior art, the positive and progressive effects of the present invention are: The flexible support combined contact rod rotor dry friction vibration reduction test bench provided by the present invention realizes the flexible support characteristics of the test bench through the interaction between the flexible support support, the dynamic friction plate and the static friction plate elements, thereby simulating the dynamic characteristics under different support stiffness and preload states; through the friction between the dynamic and static friction plates, the axial displacement is controlled by a stepper motor to adjust the positive pressure of the contact surface, thereby realizing effective control of the axial vibration and reducing the vibration of the rotor; the non-driving side safety protection base and the driving side safety protection base absorb and disperse the vibration energy, thereby reducing the stress of key components (such as the bearing seat, the rotor, etc.). This not only prolongs the service life of these key components, but also reduces the wear and fatigue caused by vibration, and improves the reliability and durability of the entire system.

[0019] 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; 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 realizing the analysis and study of different contact states of the end face teeth.

[0020] 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.

[0021] 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.

[0022] Furthermore, the design of the non-drive side flexible support bearing seat and the drive side flexible bearing seat takes into account the design critical speed, and the support stiffness is changed by adjusting the thickness of the rib plate; at the same time, the anisotropy of the bearing seat is realized, that is, the stiffness in the horizontal and vertical directions is different. This design enables the measurement of a total of 4 critical speeds in the horizontal and vertical directions within the maximum operating speed range of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings in the specification are used to provide further understanding of the present invention and constitute a part of the present invention. The schematic 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.

[0024] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 A detailed schematic diagram of the structural rod-type rotor of the present invention; Figure 3 It is a detailed schematic diagram of the dynamic and static friction plates of the present invention; Figure 4 The structure of the present invention is a cross-sectional view of a pull-rod rotor.

[0025] Among them, 1 is the base plate; 2 is the slide module; 3 is the flexible support 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-driving side flexible support bearing seat; 9 is the non-driving 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 driving side flexible bearing seat; 14 is the driving 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

[0026] In order to make the purpose, 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 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 here can be arranged and designed in various different configurations.

[0027] 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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] 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, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, which are intended to explain the present invention rather than to limit it.

[0032] See also Figure 1 A flexible support combined contact rod rotor dry friction vibration reduction test bench comprises a base plate 1, a combined rod rotor 10, a drive motor 17 and a flexible support assembly, wherein: 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 arranged on the base bottom plate 1. A flexible support support 3 is arranged 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 arranged in sequence above the base bottom plate 1 along the flexible support support 3. A non-driving side flexible support bearing seat 8 is arranged inside the non-driving side safety protection base 9, and a driving side flexible bearing seat 13 is arranged 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 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, and 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; The driving motor 17 is fixedly mounted on the outer side of the motor base 16 , and the output shaft of the driving motor 17 passes through the motor base 16 to connect with the motor-side flexible coupling 15 , and the motor-side flexible coupling 15 passes through the driving-side flexible bearing seat 13 to connect with the driving-side shaft head 29 .

[0033] In the present invention, combined contact means that the flexible support characteristics of the rod rotor test bench are realized through the interaction between the flexible support support 3, the dynamic friction plate 7 and the static friction plate 6, so that the system can introduce the characteristics of flexible support into the structure of the test bench, which means that in the operation of the test bench, the system can show the dynamic response of flexible support, not just the characteristics of rigid support. Specifically, combined contact involves a multi-level contact relationship between flexible support, static friction plate and dynamic friction plate. This design enables the test bench to simulate the dynamic characteristics under different support stiffness and preload conditions, covering the modal experiments of rigid support and flexible support, so as to more comprehensively understand and optimize the dynamic characteristics of the rod rotor and make the experiment closer to the actual working conditions.

[0034] This test bench can use the friction between the dynamic and static friction plates to control the axial displacement by using a stepper motor to adjust the positive pressure of the contact surface, thereby achieving effective control of the axial vibration and reducing the vibration of the rotor. This friction vibration reduction mechanism can reduce the stress level of each component and extend the service life of the equipment. In addition, the static and dynamic friction plates are easy to replace. The parameters of the friction interface, such as material, roughness, presence or absence of lubricating oil, etc., can be changed. At the same time, the damping characteristics can be obtained through numerical processing of pressure sensors and eddy current sensors, and the optimal vibration reduction friction parameters can be obtained by combining the change of the positive pressure parameters.

[0035] At the same time, in the present invention, considering the safety issues caused by excessive vibration caused by various fault conditions and exceeding the critical speed, the non-driving side safety protection base 9 and the driving side safety protection base 14 are designed to reduce the stress of key components (such as bearing seats, rotors, etc.) by absorbing and dispersing vibration energy. This not only prolongs the service life of these key components, but also reduces the wear and fatigue caused by vibration, and improves the reliability and durability of the entire system.

[0036] See also Figure 2 and Figure 4 The combined wheel disc 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 by means of a stopper, and the fourth arc-shaped toothed disc 28 is connected to the driving side shaft head 29 by means of a stopper. Adjacent arc-shaped toothed discs are connected by end face teeth. The non-driving side shaft head 22 and the driving side shaft head 29 are provided with a plurality of corresponding connecting holes 30 along the circumferential direction. The combined pull rod rotor 10 also comprises a circumferential pull rod 23, and the circumferential pull rod 23 passes through the connecting hole 30 to realize a pre-tightening connection of the combined wheel disc.

[0037] The combined tie-rod rotor is composed of four arc-shaped toothed discs, the non-driving side shaft head and the driving side shaft head, which are 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, so as to realize 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 tie-rod rotor from being damaged during the experiment.

[0038] See also Figure 3 The flexible support is located on the base plate of the experimental table, 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 and vibration reduction effect of the friction plate. 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, and vibration reduction is achieved through friction. The dynamic friction plate is connected to the flexible support through a threaded hole, which is convenient for 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, which is convenient for 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; wherein 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 amplitude and vibration amplitude-frequency response of the system, effectively reducing the vibration and impact of the test bench, thereby alleviating the stress level of each component, extending the service life of the equipment, and improving the stability of the mechanical system.

[0039] Specifically, a first eddy current sensor bracket 11 and a second eddy current sensor bracket 12 are sequentially arranged above the base base 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; the eddy current sensor is used to measure the response displacement of the rotor and can monitor the dynamic characteristics of the rotor.

[0040] In a specific embodiment of the present invention, 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, and 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.

[0041] Specifically, a driving side bearing seat acceleration sensor 18 is arranged 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 arranged 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.

[0042] Specifically, the diameter of the balancing screw hole 24 is 6 mm, and the number of the circumferential tie rods 23 is 12; the combined wheel disc is pre-tightened and connected by 12 circumferential tie rods (which can be short bolts) evenly distributed in the circumference, forming a distributed pre-tightened tie rod rotor structure. The first arc-shaped toothed disc 25 and the fourth arc-shaped toothed disc 28 are evenly distributed with 12 M6 balancing screw holes 24 at the outer diameter position, which are used for dynamic balancing of the rotor. By changing the tie rod pre-tightening force, experiments such as asymmetric pre-tightening and simulating fault states such as loose bolts in different phases can be realized.

[0043] Specifically, the non-driving side flexible support bearing seat 8 and the driving side flexible bearing seat 13 are welded by ribs with different stiffness in the horizontal and vertical directions respectively; the base plate 1 is connected to the T-slot foundation by bolts, and the foundation is treated with vibration isolation. The design of the bearing seat takes into account the design critical speed, and the support stiffness is changed by adjusting the thickness of the ribs; at the same time, the anisotropy of the bearing seat is realized, that is, the stiffness in the horizontal and vertical directions is different. This design makes it possible to measure a total of 4 critical speeds in the horizontal and vertical directions within the maximum operating speed range of the motor.

[0044] In a specific embodiment of the present invention, the outer diameter of the four arc-shaped toothed discs of the combined rod-type rotor 10 is 140-180 mm, see Figure 4 The combined wheel disc 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 disc through stopper fit to form a combined pull-rod rotor. The thickness of the combined wheel disc 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 driving motor 17 is 1.5kw, and the maximum continuous operating speed is 10000rpm.

[0045] The present invention provides an experimental method for a flexible support combined contact rod rotor dry friction vibration reduction test bench. The above-mentioned flexible support combined contact rod rotor dry friction vibration reduction test bench is adopted to start a driving motor 17, and the combined rod rotor 10 is pushed to rotate through the motor side flexible coupling 15. The stiffness asymmetric fault dynamics test is performed by adjusting the rod preload force 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 by 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 by 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, and the contact surface positive pressure is adjusted to control the axial vibration.

[0046] In the experiment, different support stiffnesses can be achieved by adjusting the material and geometric parameters of the flexible support. Specifically, flexible materials with different hardnesses are used or the thickness and number of the support ribs are changed to observe the changes in the dynamic response of the rotor under different support stiffnesses. Specifically, the mechanical behavior of the interface of different materials can be tested and analyzed by replacing the materials of different dynamic friction plates 5 and static friction plates 6, such as structural steel and titanium alloy materials; the anisotropy of stiffness can be achieved 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. 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 the change of modal frequency and the transition of vibration mode. In addition, an adjustable unbalanced mass can be added to the rotor to simulate the mass imbalance in actual operation and study its influence on the dynamic behavior under different speed conditions.

[0047] For ordinary technicians in the relevant technical field, after in-depth reading and understanding of the technical solution of the present invention, they are fully capable of making various forms of changes, modifications or equivalent substitutions 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 changed 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.

[0048] In addition, with the continuous progress and development of technology, new technical means and methods continue to emerge, which also provides broad space for further improvement and perfection of the present invention. Therefore, the protection scope of the present invention should also include those reasonably foreseeable improvements and extensions based on the existing technology. As long as these improvements and extensions do not deviate from the basic principles and core concepts of the present invention, they should be regarded as equivalents of the present invention and are also protected by patent rights.

Claims

1. A flexible support combined contact rod rotor dry friction vibration reduction test bench, characterized in that: It comprises a base plate (1), a combined 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 arranged on the base bottom plate (1); a flexible support support (3) is arranged 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 arranged in sequence above the base bottom plate (1) along the flexible support support (3); a non-driving side flexible support bearing seat (8) is arranged inside the non-driving side safety protection base (9); a driving side flexible bearing seat (13) is arranged 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 tie 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; A drive motor (17) is fixedly mounted on the outer side of the motor base (16); an output shaft of the drive motor (17) passes through the motor base (16) to be connected to a motor-side flexible coupling (15); and the motor-side flexible coupling (15) passes through a drive-side flexible bearing seat (13) to be connected to a drive-side shaft head (29).

2. The flexible support combined contact rod rotor dry friction vibration reduction test bench according to claim 1 is characterized in that: The combined wheel disc 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) by means of a stopper; the fourth arc-shaped toothed disc (28) is connected to the driving side shaft head (29) by means of a stopper; adjacent arc-shaped toothed discs are connected by means of end face teeth; the non-driving side shaft head (22) and the driving side shaft head (29) are both provided with a plurality of corresponding connection holes (30) along the circumferential direction; the combined pull rod rotor (10) further comprises a circumferential pull rod (23); 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 is characterized in that: 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).

4. The flexible support combined contact rod rotor dry friction vibration reduction test bench according to claim 2 is 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 tie rod rotor (10).

5. The flexible support combined contact rod rotor dry friction vibration reduction test bench according to claim 1 is characterized in that: A driving side bearing seat acceleration sensor (18) passing through the top of the driving side safety protection base (14) is arranged above the driving side flexible bearing seat (13); and a non-driving side bearing seat acceleration sensor (21) passing through the top of the non-driving side safety protection base (9) is arranged above the non-driving side flexible support bearing seat (8).

6. 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.

7. 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 bottom plate (1) is connected to the T-slot foundation by bolts, and the foundation is subjected to vibration isolation treatment.

8. 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-driving side shaft head (22) and the driving side shaft head (29) are both 20 mm.

9. 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.

10. 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 a drive motor (17), and the combined rod rotor (10) is driven to rotate through the motor side flexible coupling (15). The stiffness asymmetric fault dynamics test is performed by adjusting the rod preload force 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 a stepper motor, and the contact surface positive pressure is adjusted to control the axial vibration.

Images