Elastic ring type squeeze film damper with adjustable rigidity and damping based on memory alloy

Abstract

The invention discloses an elastic ring type squeeze oil film damper with adjustable rigidity and damping based on memory alloy, belongs to the technical field of vibration control of rotary machinery, and aims to solve the problems that a traditional damper is fixed in structural parameter and poor in adaptability, and the rigidity and damping cannot be adjusted according to the running state, the elastic ring type squeeze oil film damper comprises an outer ring, an inner ring, an oil supply shell and a mouse cage, a memory alloy ring is arranged between the outer ring and the inner ring, a first oil film is formed between the inner ring and the mouse cage, a second oil film is formed between the inner ring and the memory alloy ring, a third oil film is formed between the memory alloy ring and the outer ring, a fourth oil film is formed between the outer ring and the oil supply shell, and a heating structure is arranged on the memory alloy ring. And the temperature of the memory alloy ring is controlled through the heating structure, so that the rigidity of the memory alloy ring and the oil film forms of the second oil film and the third oil film are changed. The damping device is mainly used as a damping device of high-speed rotating equipment which needs to accurately control vibration and rigidity.

Description

Technical Field

[0001] The invention belongs to the technical field of rotating machinery vibration control, and in particular relates to an elastic ring type squeeze film damper with adjustable damping based on a memory alloy. Background Art

[0002] Squeeze film dampers, commonly used vibration control elements in high-speed rotating machinery, are widely used in rotor systems such as aircraft engines and gas turbines. They play a vital role in reducing vibration, improving system stability, and suppressing nonlinear responses. Traditional squeeze film dampers typically rely on fixed structural parameters, oil film thickness, or changes in oil supply pressure to adjust stiffness and damping performance. However, these methods are mostly passive and difficult to adapt to the dynamic requirements of the system during non-steady-state operation, such as startup, shutdown, or load disturbances, resulting in limited overall system stability.

[0003] Existing elastic ring squeeze film dampers generally use elastic elements to generate a constant squeeze pressure. While these damping effects can be effective under specific operating conditions, they lack the dynamic adaptability of stiffness and damping, making them incapable of meeting the control requirements under complex operating conditions. Some research has attempted to incorporate fluid control, magnetorheological materials, or piezoelectric elements to achieve dynamic adjustment. However, these solutions often suffer from complex structures, difficulty integrating control systems, delayed response, and poor environmental adaptability. Summary of the Invention

[0004] In order to solve the problems of fixed structural parameters, poor adaptability and inability to adjust stiffness and damping according to the operating state of traditional dampers, the present invention provides an elastic ring type squeeze film damper with adjustable stiffness and damping based on a memory alloy.

[0005] An elastic ring-type squeeze film damper with adjustable damping strength based on a memory alloy, comprising an outer ring, an inner ring, an oil supply housing, and a cage. The oil supply housing, outer ring, inner ring, and cage are sequentially arranged from the outside to the inside. A memory alloy ring is provided between the outer ring and the inner ring. A first oil film is formed between the inner ring and the cage, a second oil film is formed between the inner ring and the memory alloy ring, a third oil film is formed between the memory alloy ring and the outer ring, and a fourth oil film is formed between the outer ring and the oil supply housing. The first, second, third, and fourth oil films are interconnected. A heating structure is provided on the memory alloy ring. The heating structure controls the temperature of the memory alloy ring, thereby changing the stiffness of the memory alloy ring and the oil film morphology of the second and third oil films.

[0006] Furthermore, N outer ring oil holes are machined on the outer ring wall at equal intervals along the circumferential direction, where N is a positive integer; N radially extending outer ring bosses are machined on the outer ring wall at equal intervals along the circumferential direction, and each outer ring oil hole is arranged between two adjacent outer ring bosses; N radially extending outer ring embedded grooves are machined on the inner ring wall at equal intervals along the circumferential direction, and each outer ring embedded groove is arranged correspondingly to an outer ring boss inside and outside; the outer ring divides the fourth oil film into N four-layer oil film cavities through the N outer ring bosses, and each four-layer oil film cavity is connected to the third oil film layer through an outer ring oil hole;

[0007] Furthermore, the outer ring wall of the inner ring is equidistantly machined with N inner ring oil holes along the circumferential direction, the outer ring wall of the inner ring is equidistantly machined with N radially extending inner ring grooves along the circumferential direction, and each inner ring oil hole is arranged between two adjacent inner ring grooves, and the inner ring wall of the inner ring is equidistantly machined with N radially extending inner ring bosses along the circumferential direction, and each inner ring boss is arranged correspondingly to an inner ring groove. The inner ring divides the first layer of oil film into N first-layer oil film cavities through the N inner ring bosses, and each first-layer oil film cavity is connected to the second layer of oil film through an inner ring oil hole;

[0008] Furthermore, the outer ring wall of the memory alloy ring is equidistantly processed with N memory alloy ring oil holes along the circumferential direction, the outer ring wall of the memory alloy ring is equidistantly provided with N radially extending memory alloy ring outer bosses along the circumferential direction, and each memory alloy ring oil hole is arranged between two adjacent memory alloy ring outer bosses, the inner ring wall of the memory alloy ring is equidistantly provided with N radially extending memory alloy ring inner bosses along the circumferential direction, and each memory alloy ring inner boss is correspondingly arranged with a memory alloy ring outer boss inside and outside, each memory alloy ring outer boss is correspondingly arranged with an outer ring embedded groove, and each memory alloy ring inner boss is correspondingly arranged with an inner ring embedded groove, and the memory The alloy ring divides the second oil film into N second-layer oil film cavities through N memory alloy ring inner bosses, and each first-layer oil film cavity is connected to a second-layer oil film cavity through an inner ring oil hole. The memory alloy ring divides the third oil film into N third-layer oil film cavities through N memory alloy ring outer bosses, and each fourth-layer oil film cavity is connected to a third-layer oil film cavity through an outer ring oil hole, and each third-layer oil film cavity is connected to a second-layer oil film cavity through a memory alloy ring oil hole. A heating structure is provided on the memory alloy ring, and the heating structure is arranged away from the memory alloy ring oil hole, the memory alloy ring outer boss, and the memory alloy ring inner boss.

[0009] Furthermore, N oil supply hole groups are machined on the outer ring wall of the oil supply housing, each oil supply hole group is arranged corresponding to a four-layer oil film cavity, each oil supply hole group includes an oil inlet hole and an oil return hole, the oil outlet end of the oil supply device is connected to the corresponding four-layer oil film cavity through the oil inlet hole, and the oil return end of the oil supply device is connected to the corresponding four-layer oil film cavity through the oil return hole;

[0010] Furthermore, the value range of N is 3~6;

[0011] Furthermore, the heating structure includes an inner heating plate group and an outer heating plate group, the inner heating plate group includes a plurality of inner heating plates, the plurality of inner heating plates are equidistantly arranged on the inner ring wall of the memory alloy ring along the circumferential direction, and each inner heating plate is arranged to avoid the oil hole of the memory alloy ring and the inner boss of the memory alloy ring; the outer heating plate group includes a plurality of outer heating plates, the plurality of outer heating plates are equidistantly arranged on the outer ring wall of the memory alloy ring along the circumferential direction, and each outer heating plate is arranged to avoid the oil hole of the memory alloy ring and the outer boss of the memory alloy ring, and each inner heating plate is arranged inside and outside corresponding to an outer heating plate;

[0012] Furthermore, the outer ring boss, the inner ring boss, the memory alloy ring outer boss and the memory alloy ring inner boss are all platforms with isosceles trapezoidal longitudinal sections;

[0013] Furthermore, the outer ring embedded groove and the inner ring embedded groove are both groove bodies with isosceles trapezoidal longitudinal sections;

[0014] The beneficial effects of this application compared to the prior art are as follows:

[0015] 1. The present application provides an elastic ring squeeze film damper with adjustable stiffness and damping based on a memory alloy. The memory alloy is innovatively introduced into the elastic ring squeeze film damper structure. The memory alloy material has significant thermally induced phase change characteristics and can reversibly switch between martensite and austenite under different temperature conditions, accompanied by significant stiffness changes. It has the advantages of compact structure, fast response, and stable regulation. By utilizing its controllable deformation characteristics with temperature changes, it can realize active adjustment of the damper stiffness and damping performance, thereby improving the system's adaptability under multiple working conditions.

[0016] 2. The present application provides an elastic ring-type squeeze film damper with adjustable damping based on a memory alloy. Compared with the traditional damper structure, it has an additional oil film layer. In the traditional damper structure, the oil film layer is usually limited to the space between the inner ring and the outer ring, making it difficult to form a multi-level shear zone to enhance the damping performance. The present application further introduces an external oil supply shell and an internal squirrel cage structure to construct a composite ring structure consisting of a squirrel cage, an inner ring, a memory alloy ring, an outer ring, and an oil supply shell. A multi-layer oil film can be formed between adjacent parts. The oil flows between the rings and generates distributed shear damping, thereby significantly improving the overall energy consumption capacity and thermal stability, and providing a more efficient and flexible vibration control solution for rotating machinery systems.

[0017] 3. This application provides an elastic ring squeeze film damper with adjustable damping based on a memory alloy. It supports integration with speed, vibration, and other signal feedback systems, making it suitable for building closed-loop control logic. Through a temperature control module, vibration sensor, or speed detection device, it can automatically determine the operating condition and control the heating process in real time, thus giving the damper a certain degree of intelligent self-adaptation.

[0018] 4. The present application provides an elastic ring squeeze film damper with adjustable damping based on a memory alloy. While maintaining the original elastic ring damper interface and installation dimensions, only the internal ring structure is functionally enhanced. No additional complex components are required. It has good engineering compatibility and replacement convenience. It is suitable for high-speed rotating equipment such as aircraft engines, high-speed train rotors, gas turbines, and industrial turbines that require precise control of vibration and stiffness. It can be widely used in engineering fields with variable working conditions and high reliability requirements, and has significant engineering practical value and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the arrangement of the inner ring, outer ring and memory alloy ring in the elastic ring type squeeze film damper with adjustable damping based on memory alloy described in this application;

[0020] Figure 2 This is a front view of the arrangement of the inner ring, outer ring and memory alloy ring in the elastic ring type squeeze film damper with adjustable damping based on memory alloy described in this application;

[0021] Figure 3 This is a schematic structural diagram of the outer ring of the elastic ring type squeeze film damper with adjustable damping based on memory alloy described in this application;

[0022] Figure 4 This is a schematic structural diagram of the memory alloy ring in the elastic ring type squeeze film damper with adjustable damping based on the memory alloy described in this application;

[0023] Figure 5 This is a schematic structural diagram of the inner ring in the elastic ring type squeeze film damper with adjustable damping based on memory alloy described in this application;

[0024] Figure 6 A schematic diagram of the structure of the elastic ring squeeze film damper with adjustable damping degree based on the memory alloy described in this application;

[0025] Figure 7 This is a main cross-sectional schematic diagram of the elastic ring type squeeze film damper with adjustable damping based on memory alloy described in this application;

[0026] Figure 8 Schematic diagram of an explosion of an elastic ring type squeeze film damper with adjustable damping based on memory alloy described in this application;

[0027] In the figure, 1 is an outer ring, 11 is an outer ring oil hole, 12 is an outer ring boss, 13 is an outer ring groove, 2 is a memory alloy ring, 21 is a memory alloy ring oil hole, 22 is a memory alloy ring outer boss, 23 is a memory alloy ring inner boss, 3 is an inner ring, 31 is an inner ring oil hole, 32 is an inner ring groove, 33 is an inner ring boss, 4 is an oil supply housing, 41 is an oil inlet hole, 42 is an oil return hole, 5 is a squirrel cage, 6 is a first-layer oil film cavity, 7 is a second-layer oil film cavity, 8 is a third-layer oil film cavity, 9 is a fourth-layer oil film cavity and 10 is a heating structure. DETAILED DESCRIPTION

[0028] Specific implementation method 1: Combination Figures 1 to 8 The present embodiment is described. In the present embodiment, an elastic ring type squeeze film damper with adjustable damping based on a memory alloy is provided. The squeeze film damper comprises an outer ring 1, an inner ring 3, an oil supply shell 4 and a squirrel cage 5. The oil supply shell 4, the outer ring 1, the inner ring 3 and the squirrel cage 5 are sequentially arranged from the outside to the inside. A memory alloy ring 2 is provided between the outer ring 1 and the inner ring 3. A first oil film is formed between the inner ring 3 and the squirrel cage 5, a second oil film is formed between the inner ring 3 and the memory alloy ring 2, a third oil film is formed between the memory alloy ring 2 and the outer ring 1, and a fourth oil film is formed between the outer ring 1 and the oil supply shell 4. The first oil film, the second oil film, the third oil film and the fourth oil film are connected. A heating structure 10 is provided on the memory alloy ring 2. The memory alloy ring 2 is temperature-controlled by the heating structure 10 to change the stiffness of the memory alloy ring 2 and the oil film morphology of the second oil film and the third oil film.

[0029] N outer ring oil holes 11 are equidistantly formed on the outer ring wall of the outer ring 1 along the circumferential direction, where N is a positive integer. N radially extending outer ring bosses 12 are equidistantly formed on the outer ring wall of the outer ring 1 along the circumferential direction, and each outer ring oil hole 11 is arranged between two adjacent outer ring bosses 12. N radially extending outer ring embedded grooves 13 are equidistantly formed on the inner ring wall of the outer ring 1 along the circumferential direction, and each outer ring embedded groove 13 is arranged correspondingly inside and outside an outer ring boss 12. The outer ring 1 divides the fourth layer of oil film into N four-layer oil film cavities 9 through the N outer ring bosses 12, and each four-layer oil film cavity 9 is connected to the third layer of oil film through an outer ring oil hole 11;

[0030] N inner ring oil holes 31 are machined circumferentially and equidistantly on the outer ring wall of the inner ring 3. N radially extending inner ring grooves 32 are machined circumferentially and equidistantly on the outer ring wall of the inner ring 3. Each inner ring oil hole 31 is arranged between two adjacent inner ring grooves 32. N radially extending inner ring bosses 33 are circumferentially and equidistantly provided on the inner ring wall of the inner ring 3. Each inner ring boss 33 is arranged correspondingly inside and outside an inner ring groove 32. The inner ring 3 divides the first layer of oil film into N single-layer oil film cavities 6 through the N inner ring bosses 33. Each single-layer oil film cavity 6 is connected to the second layer of oil film through an inner ring oil hole 31.

[0031] The outer ring wall of the memory alloy ring 2 is equidistantly processed with N memory alloy ring oil holes 21 along the circumferential direction, and the outer ring wall of the memory alloy ring 2 is equidistantly provided with N radially extending memory alloy ring outer bosses 22 along the circumferential direction, and each memory alloy ring oil hole 21 is arranged between two adjacent memory alloy ring outer bosses 22, and the inner ring wall of the memory alloy ring 2 is equidistantly provided with N radially extending memory alloy ring inner bosses 23 along the circumferential direction, and each memory alloy ring inner boss 23 is arranged correspondingly with a memory alloy ring outer boss 22 inside and outside, each memory alloy ring outer boss 22 is arranged in correspondence with an outer ring embedded groove 13, and each memory alloy ring inner boss 23 is arranged in correspondence with an inner ring embedded groove 32, and the memory alloy ring 2 is generally The second oil film is divided into N two-layer oil film cavities 7 by N memory alloy ring inner bosses 23, and each one-layer oil film cavity 6 is connected to a two-layer oil film cavity 7 through an inner ring oil hole 31. The memory alloy ring 2 divides the third oil film into N three-layer oil film cavities 8 by N memory alloy ring outer bosses 22, and each four-layer oil film cavity 9 is connected to a three-layer oil film cavity 8 through an outer ring oil hole 11, and each three-layer oil film cavity 8 is connected to a two-layer oil film cavity 7 through a memory alloy ring oil hole 21. The heating structure 10 is provided on the memory alloy ring 2, and the heating structure 10 is arranged away from the memory alloy ring oil hole 21, the memory alloy ring outer boss 22 and the memory alloy ring inner boss 23.

[0032] N oil supply hole groups are machined on the outer ring wall of the oil supply housing 4. Each oil supply hole group is corresponding to a four-layer oil film cavity 9. Each oil supply hole group includes an oil inlet hole 41 and an oil return hole 42. The oil outlet end of the oil supply device is connected to the corresponding four-layer oil film cavity 9 through the oil inlet hole 41, and the oil return end of the oil supply device is connected to the corresponding four-layer oil film cavity 9 through the oil return hole 42.

[0033] The value range of N is 3~6.

[0034] The elastic ring-type squeeze film damper with adjustable stiffness and damping based on a memory alloy provided in this embodiment forms a composite ring system of a squirrel cage, an inner ring, a memory alloy ring, an outer ring, and an oil supply housing. A total of four layers of distributed oil film are formed between multiple adjacent interfaces, ensuring that the oil forms a shear flow field between each layer, effectively improving the damping energy consumption level, and being suitable for high-frequency, high-amplitude disturbance suppression conditions. The multi-layer oil film not only improves the equivalent damping coefficient of the system, but also enhances the diffusion and dispersion capabilities of thermal energy, thereby improving the overall thermal stability of the system, extending the service life, and reducing the risk of lubrication failure. The oil film structure complements the control characteristics of the memory alloy, achieving both high energy consumption and stiffness adjustment functions.

[0035] On the basis of constructing a multi-layer oil film, this application also introduces a memory alloy ring with thermally induced phase change characteristics. With its deformation ability under different temperature conditions, the active adjustment of structural stiffness and damping characteristics is achieved, significantly improving the vibration control ability and operating stability of the rotor system under complex working conditions. The memory alloy ring is flexible in the martensite state, allowing a large deformation amount. The boss has a weak constraint effect on the inner and outer rings, which helps to enhance the extrusion and shear energy consumption of the oil film and provide high damping characteristics. In the austenite state, the material returns to its original shape and the stiffness is significantly improved. The boss forms an interference fit with the inner and outer rings, restricting relative movement and improving the overall rigidity of the structure. The different states of the memory alloy ring correspond to different working conditions. During the start-up, shutdown or disturbance stages, the memory alloy is maintained in the martensite state. The structure is soft and has a large degree of freedom of relative movement, which can effectively absorb impact energy and enhance damping. In the stable operation stage, the material is transformed into the austenite state by heating, enhancing stiffness, suppressing nonlinear vibration, and ensuring the centering operation of the system.

[0036] The phase change of the memory alloy ring can be driven by a variety of temperature control methods, including but not limited to flexible heating pads, inductive heating, hot air flow, or radiant heating. Depending on the actual application requirements, different methods can be used to control the temperature of the memory alloy material to trigger its phase change, thereby achieving dynamic switching between stiffness and damping performance.

[0037] Specific implementation method 2: Combination Figures 1 to 8 This embodiment is described. This embodiment differs from the first embodiment in that the outer ring boss 12, the inner ring boss 33, the memory alloy ring outer boss 22 and the memory alloy ring inner boss 23 are all isosceles trapezoidal in longitudinal section.

[0038] The outer ring embedding groove 13 and the inner ring embedding groove 32 are both groove bodies with isosceles trapezoidal longitudinal sections. Other components and connection methods are the same as those in the first embodiment.

[0039] In this embodiment, the outer boss 22 of the memory alloy ring and the inner boss 23 of the memory alloy ring are matched with the outer ring groove 13 and the inner ring groove 32. In the specific arrangement, the structural dimensions of the outer boss 22 of the memory alloy ring and the inner boss 23 of the memory alloy ring should be slightly larger than the structural dimensions of the outer ring groove 13 and the inner ring groove 32. In this way, top pressure or interference fit can be generated during the phase change process, thereby adjusting the contact state and stiffness relationship between the inner and outer rings.

[0040] Specific implementation method three: Combination Figures 1 to 8This embodiment is described. The difference between this embodiment and the second embodiment is that the heating structure 10 includes an inner heating plate group and an outer heating plate group. The inner heating plate group includes a plurality of inner heating plates, which are equidistantly arranged on the inner ring wall of the memory alloy ring 2 along the circumferential direction, and each inner heating plate is arranged to avoid the memory alloy ring oil hole 21 and the memory alloy ring inner boss 23. The outer heating plate group includes a plurality of outer heating plates, which are equidistantly arranged on the outer ring wall of the memory alloy ring 2 along the circumferential direction, and each outer heating plate is arranged to avoid the memory alloy ring oil hole 21 and the memory alloy ring outer boss 22. Each inner heating plate and an outer heating plate are arranged correspondingly inside and outside. Other components and connection methods are the same as those in the second embodiment.

[0041] In this embodiment, the heating structure is composed of a flexible heating sheet. In order to ensure the stability of the phase change drive, a heating sheet structure is provided on both the inner and outer sides of the memory alloy ring in this embodiment. The heating method of the flexible heating sheet is based on electric heating. Each heating sheet is connected to an external power supply control system and is powered by a slip ring, a brush sheet or wirelessly to achieve fast-response temperature control.

[0042] The present invention has been disclosed as above with reference to preferred embodiments, but this is not intended to limit the present invention. Any technician familiar with the present invention can make slight changes or modifications to equivalent embodiments using the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0043] How it works

[0044] The present application provides an elastic ring-type squeeze film damper with adjustable damping based on a memory alloy. When in operation, the various components are first assembled according to the connection relationships described in Specific Embodiments 1 to Specific Embodiments 3, and oil is injected into the squeeze film damper through an external oil supply system. The oil flows between the rings through the oil holes. The oil holes are evenly distributed, and the hole diameters match the oil circuit system to ensure a continuous supply of lubricating oil and a cooling function. When the structure is in the startup state, the memory alloy ring 2 does not need to be heated by the heating structure 10. The memory alloy ring 2 is in a martensitic state. Due to its soft structure and large relative freedom of movement, it can effectively absorb impact energy and enhance damping. As the structure runs to a stable state, the heating structure 10 heats the memory alloy ring 2 to the austenite phase transition temperature (60°C) to enhance the stiffness of the memory alloy ring 2, suppress nonlinear vibration, and ensure the centering operation of the system. When the structure is ready to shut down, the heating of the memory alloy ring 2 is stopped, and the memory alloy ring 2 is restored to the martensitic state.

[0045] The assembly process of an elastic ring type squeeze film damper with adjustable damping based on memory alloy provided in this application is as follows:

[0046] Step 1: During the pretreatment phase, the memory alloy ring 2 is kept in a martensitic state at room temperature or in a cooling environment, with its boss 8 in a flexible and deformable state. Clean the inner groove of the outer ring 1, the outer groove of the inner ring 3, and the contact surface of the memory alloy ring to ensure that there is no oil or foreign matter remaining.

[0047] Step 2: Fitting and positioning stage: align the outer boss of the memory alloy ring 2 with the inner groove of the outer ring 1 and push them axially until they are fully fitted; rotate the memory alloy ring to accurately align the inner boss with the outer groove of the inner ring 3 to complete the fitting and positioning, ensuring the concentricity of the structure;

[0048] The disassembly and maintenance process is as follows:

[0049] Step A: Start the heating system to heat the memory alloy ring to an austenitic state (e.g., 80° C.) so that the boss 8 returns to its original rigid shape and eliminates the interference fit with the groove;

[0050] Step B: Remove the inner ring 3 and the memory alloy ring 2, and check the wear of the contact surface between the boss and the groove. If the wear depth exceeds 0.1mm, it is recommended to replace the memory alloy ring assembly.

[0051] This application improves component replacement efficiency and ensures long-term stable operation through split design and standardized interfaces.

[0052] The dynamic stiffness test process of an elastic ring squeeze film damper with adjustable damping based on a memory alloy provided in this application is as follows:

[0053] Step a: Install the damper on a vibration test bench, with the outer ring 1 rigidly fixed to the test bench and the inner ring 3 connected to the exciter to simulate the actual rotor excitation state;

[0054] Step b: Start the exciter and apply a sine sweep excitation with a frequency range of 0 to 1000 Hz. At the same time, measure the relative displacement response between the inner ring 3 and the outer ring 1 using a displacement sensor.

[0055] Step c: In the unheated state (the memory alloy is in the martensite state), record the amplitude-frequency response curve of the damper and calculate its initial stiffness coefficient and damping coefficient;

[0056] Step d: Start the temperature control unit and heat the memory alloy ring 2 to the austenite phase transition temperature (e.g., 60°C) to restore its shape. Repeat steps 2 to 3 to obtain parameters in the stiffness enhancement state.

[0057] Step e: Compare the response characteristics under the two states to verify the adjustability and thermal response performance of the damper structure.

[0058] This application realizes comparative verification of the damper stiffness and damping performance under different states by regulating the temperature state of the memory alloy ring and combining vibration excitation with displacement sensor measurement.

Claims

1. An elastic ring type squeeze film damper with adjustable damping strength based on a memory alloy, the squeeze film damper comprising an outer ring (1), an inner ring (3), an oil supply housing (4) and a squirrel cage (5), wherein the oil supply housing (4), the outer ring (1), the inner ring (3) and the squirrel cage (5) are sequentially arranged from the outside to the inside, and is characterized in that: A memory alloy ring (2) is provided between the outer ring (1) and the inner ring (3), a first oil film is formed between the inner ring (3) and the squirrel cage (5), a second oil film is formed between the inner ring (3) and the memory alloy ring (2), a third oil film is formed between the memory alloy ring (2) and the outer ring (1), and a fourth oil film is formed between the outer ring (1) and the oil supply housing (4), and the first oil film, the second oil film, the third oil film and the fourth oil film are connected. A heating structure (10) is provided on the memory alloy ring (2), and the memory alloy ring (2) is temperature-controlled by the heating structure (10) to change the self-rigidity of the memory alloy ring (2) and the oil film morphology of the second oil film and the third oil film.

2. The elastic ring type squeeze film damper with adjustable damping based on memory alloy according to claim 1, characterized in that: N outer ring oil holes (11) are equidistantly processed on the outer ring wall of the outer ring (1) along the circumferential direction, where N is a positive integer. N radially extending outer ring bosses (12) are equidistantly processed on the outer ring wall of the outer ring (1) along the circumferential direction, and each outer ring oil hole (11) is arranged between two adjacent outer ring bosses (12). N radially extending outer ring embedded grooves (13) are equidistantly processed on the inner ring wall of the outer ring (1) along the circumferential direction, and each outer ring embedded groove (13) is arranged correspondingly to an outer ring boss (12) inside and outside. The outer ring (1) divides the fourth layer of oil film into N four-layer oil film cavities (9) through the N outer ring bosses (12), and each four-layer oil film cavity (9) is connected to the third layer of oil film through an outer ring oil hole (11).

3. The elastic ring type squeeze film damper with adjustable damping based on memory alloy according to claim 2, characterized in that: N inner ring oil holes (31) are machined equidistantly along the circumferential direction on the outer ring wall of the inner ring (3), N radially extending inner ring grooves (32) are machined equidistantly along the circumferential direction on the outer ring wall of the inner ring (3), and each inner ring oil hole (31) is arranged between two adjacent inner ring grooves (32), and N radially extending inner ring bosses (33) are arranged equidistantly along the circumferential direction on the inner ring wall of the inner ring (3), and each inner ring boss (33) is arranged correspondingly to an inner ring groove (32) inside and outside, and the inner ring (3) divides the first layer of oil film into N single-layer oil film cavities (6) through the N inner ring bosses (33), and each single-layer oil film cavity (6) is connected to the second layer of oil film through an inner ring oil hole (31).

4. The elastic ring type squeeze film damper with adjustable damping based on memory alloy according to claim 3, characterized in that: The outer ring wall of the memory alloy ring (2) is equidistantly processed with N memory alloy ring oil holes (21) along the circumferential direction, the outer ring wall of the memory alloy ring (2) is equidistantly provided with N radially extending memory alloy ring outer bosses (22), and each memory alloy ring oil hole (21) is arranged between two adjacent memory alloy ring outer bosses (22), the inner ring wall of the memory alloy ring (2) is equidistantly provided with N radially extending memory alloy ring inner bosses (23) along the circumferential direction, and each memory alloy ring inner boss (23) is arranged correspondingly with a memory alloy ring outer boss (22) inside and outside, each memory alloy ring outer boss (22) is arranged correspondingly with an outer ring embedded groove (13), and each memory alloy ring inner boss (23) is arranged correspondingly with an inner ring embedded groove (32), and the memory alloy ring (2) is provided with N memory rings. The alloy ring inner boss (23) divides the second oil film into N two-layer oil film cavities (7), and each one-layer oil film cavity (6) is connected to a two-layer oil film cavity (7) through an inner ring oil hole (31). The memory alloy ring (2) divides the third oil film into N three-layer oil film cavities (8) through N memory alloy ring outer bosses (22), and each four-layer oil film cavity (9) is connected to a three-layer oil film cavity (8) through an outer ring oil hole (11). Each three-layer oil film cavity (8) is connected to a two-layer oil film cavity (7) through a memory alloy ring oil hole (21). The heating structure (10) is arranged on the memory alloy ring (2), and the heating structure (10) is arranged to avoid the memory alloy ring oil hole (21), the memory alloy ring outer boss (22) and the memory alloy ring inner boss (23).

5. The elastic ring type squeeze film damper with adjustable damping based on memory alloy according to claim 4, characterized in that: N oil supply hole groups are machined on the outer ring wall of the oil supply housing (4), and each oil supply hole group is arranged corresponding to a four-layer oil film cavity (9). Each oil supply hole group includes an oil inlet hole (41) and an oil return hole (42). The oil outlet end of the oil supply device is connected to the corresponding four-layer oil film cavity (9) through the oil inlet hole (41), and the oil return end of the oil supply device is connected to the corresponding four-layer oil film cavity (9) through the oil return hole (42).

6. The elastic ring type squeeze film damper with adjustable damping based on memory alloy according to claim 5, characterized in that: The value range of N is 3~6.

7. The elastic ring type squeeze film damper with adjustable damping based on memory alloy according to claim 4, characterized in that: The heating structure (10) includes an inner heating plate group and an outer heating plate group. The inner heating plate group includes a plurality of inner heating plates, which are equidistantly arranged on the inner ring wall of the memory alloy ring (2) along the circumferential direction, and each inner heating plate is arranged to avoid the memory alloy ring oil hole (21) and the memory alloy ring inner boss (23). The outer heating plate group includes a plurality of outer heating plates, which are equidistantly arranged on the outer ring wall of the memory alloy ring (2) along the circumferential direction, and each outer heating plate is arranged to avoid the memory alloy ring oil hole (21) and the memory alloy ring outer boss (22).

8. The elastic ring type squeeze film damper with adjustable damping based on memory alloy according to claim 7, characterized in that: Each inner heating plate and an outer heating plate are arranged correspondingly inside and outside.

9. The elastic ring type squeeze film damper with adjustable damping based on memory alloy according to claim 5, characterized in that: The outer ring boss (12), the inner ring boss (33), the memory alloy ring outer boss (22) and the memory alloy ring inner boss (23) are all platforms with isosceles trapezoidal longitudinal sections.

10. The elastic ring type squeeze film damper with adjustable damping based on memory alloy according to claim 9, characterized in that: The outer ring embedded groove (13) and the inner ring embedded groove (32) are both groove bodies with isosceles trapezoidal longitudinal sections.

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