Squeeze film damper load test device

Abstract

A squeeze film damper load test device is used for testing load force transmission characteristics of a squeeze film damper, the load test device comprises a support for supporting the squeeze film damper, and the squeeze film damper comprises an outer ring and an inner ring. The load test device further comprises an inner ring force transmission clamp adjacent to the inner circumferential surface of the inner ring and a load transmission assembly transmitting loads to the inner ring force transmission clamp. The load transmission assembly comprises a load decomposition assembly connected with the inner ring force transmission clamp, a load distribution component connected with the load decomposition assembly and a load bearing component connected with the load distribution component. Through the load test device, loads can be applied to the squeeze film damper in different load loading modes, and the load force transmission characteristics of the squeeze film damper under different loads can be effectively tested. In addition, the reading of the oil film pressure can be obtained so as to reflect the influence of the oil film pressure of the extrusion oil film damper on the load force transmission characteristic of the extrusion oil film damper.

Description

Technical Field

[0001] This invention relates to the field of extrusion film damper testing, and particularly to a load testing device for testing the load transmission characteristics of extrusion film dampers. Background Technology

[0002] The squeeze film damper is a new technology developed in the 1960s, and its development accelerated rapidly in the 1980s. Due to its significant vibration reduction effect and small footprint, it was first applied to aero engines and has now become a typical design for reducing engine vibration. In the squeeze film damper, the interference fit between the outer ring of the rolling bearing and the bearing housing is changed to a suitable clearance fit. A sleeve is then fitted onto the outer ring of the rolling bearing as the inner ring of the squeeze film damper. The rotation of this inner ring is restricted by pins or squirrel-cage elastic supports. The clearance is filled with lubricating oil. The journal's whirling motion squeezes the lubricating oil between the inner and outer rings. Through the viscous damping of the lubricating oil, kinetic energy is converted into internal energy, thereby achieving vibration reduction.

[0003] In existing technology, there are two basic forms of compression film dampers: concentric and non-concentric. Concentric structures have a centering spring (usually a squirrel-cage elastic support), and the rotor's gravity is assumed to be balanced by the initial restoring force of the elastic support. Therefore, the influence of gravity can be neglected when analyzing the rotor's dynamic characteristics, and in most cases, the rotor's steady-state response trajectory can be assumed to be circular. Non-concentric structures must consider the influence of gravity (except for vertical rotors), and the rotor's steady-state response trajectory cannot be assumed to be concentric circles, making the analysis much more complex. Currently, concentric structures are commonly used in aero-engines.

[0004] While extrusion film dampers offer significant vibration reduction, poor design or worsening rotor system imbalance can greatly increase the nonlinearity of the oil film force, leading to detrimental nonlinear responses such as uncoordinated rotor precession, bistable jumps, and "lock-up" before reaching the critical speed. Furthermore, current testing apparatuses for extrusion film dampers often focus on testing their vibration characteristics rather than their load transmission characteristics. Therefore, a load testing apparatus is needed to test the load transmission characteristics of extrusion film dampers under different loads, providing data support for establishing their dynamic models. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention proposes a load testing device. The purpose of this device is to apply loads to the extrusion film damper under different load modes, thereby effectively testing the load transmission characteristics of the extrusion film damper under different loads. The load testing device according to this invention also helps to reflect the influence of the oil film pressure of the extrusion film damper on its load transmission characteristics. For example, the load is an impact load.

[0006] Therefore, this invention proposes a load testing device for an extrusion film damper, used to test the load transmission characteristics of the extrusion film damper under different loads. The load testing device includes a support for the extrusion film damper, which includes an outer ring and an inner ring, the outer ring being supported by a bracket. The load testing device further includes:

[0007] The inner ring force transmission clamp is adjacent to the inner circumferential surface of the inner ring and is used to transmit loads to the inner ring.

[0008] And a load transfer component, which is connected to the inner ring force transmission fixture. The load transfer component bears the impact load and transfers the load to the inner ring force transmission fixture.

[0009] According to the following technical solution, the extrusion oil film damper load testing device of the present invention can achieve the following beneficial effects: through the load testing device, a load can be applied to the extrusion oil film damper, thereby effectively testing the load transmission characteristics of the extrusion oil film damper under different loads.

[0010] In an embodiment of the present invention, the load transmission component includes:

[0011] The load decomposition assembly is connected to the inner ring force transmission clamp and is used to transmit the load decomposed at a predetermined angle to the inner ring force transmission clamp.

[0012] The load distribution component is connected to the load decomposition assembly and is used to distribute the load to the load decomposition assembly.

[0013] The load-bearing component is connected to the load distribution component and is used to transfer the load to the load distribution component.

[0014] According to the above technical solution, the extrusion oil film damper load test device of the present invention can achieve the following beneficial effects: through the load test device, loads can be applied to the extrusion oil film damper in different load loading modes, such as at different angles, thereby effectively testing the load transmission characteristics of the extrusion oil film damper under different loads.

[0015] In an embodiment of the present invention, the inner ring force transmission fixture includes an inner ring force transmission base and an inner ring force transmission rod. The inner ring force transmission base is arranged such that the outer peripheral surface of the inner ring force transmission base is adjacent to the inner peripheral surface of the inner ring. The inner ring force transmission rod includes a fixed end and a free end. The fixed end of the inner ring force transmission rod is fixed to the inner ring force transmission base, while the free end of the inner ring force transmission rod is connected to the load decomposition assembly.

[0016] According to the above technical solution, the load testing device for the extrusion oil film damper of the present invention can achieve the following beneficial effects: the load decomposition component decomposes the load and transmits it to the inner ring force transmission rod, and then loads it onto the inner ring of the extrusion oil film damper through the inner ring force transmission base, so that loads can be applied to the extrusion oil film damper in different load loading modes, such as at different angles.

[0017] In an embodiment of the present invention, the load decomposition assembly includes a four-bar linkage.

[0018] According to the above technical solution, the extrusion oil film damper load test device of the present invention can achieve the following beneficial effects: through the four-bar mechanism, loads can be applied to the extrusion oil film damper in different load loading modes, such as at different angles.

[0019] In an embodiment of the invention, the links in the four-bar linkage are connected in pairs to form a quadrilateral, wherein one corner of the quadrilateral is connected to the free end of the inner ring force transmission rod, and the opposite corner is connected to the load distribution member.

[0020] According to the above technical solution, the extrusion oil film damper load testing device of the present invention can achieve the following beneficial effects: the load distribution component distributes the load to the load decomposition component, and the load decomposition component decomposes the load and transmits it to the inner ring force transmission rod, so that loads can be applied to the extrusion oil film damper in different load loading modes, such as at different angles.

[0021] In an embodiment of the present invention, the load distribution component includes a load distribution rod, one end of which is connected to the four-bar linkage of the load decomposition assembly, and the other end is connected to the load-bearing component.

[0022] According to the above technical solution, the extrusion oil film damper load test device of the present invention can achieve the following beneficial effects: after the load-bearing component bears the load, it transmits the load to the load distribution component, and the load distribution component then distributes the load to the load decomposition component, so that loads can be applied to the extrusion oil film damper in different load loading modes, such as at different angles.

[0023] In an embodiment of the present invention, the load-bearing component includes a pole, the pole having a fixed end and a load-bearing end, and a load distribution component connected to the load-bearing end.

[0024] According to the above technical solution, the extrusion oil film damper load test device of the present invention can achieve the following beneficial effects: after the load-bearing end of the load-bearing member bears the load, it transmits the load to the load distribution member, and the load distribution member then distributes the load to the load decomposition component, so that loads can be applied to the extrusion oil film damper in different load loading modes, such as at different angles.

[0025] In an embodiment of the present invention, the fixed end of the inner ring force transmission rod is fixed to the center of the inner ring force transmission base.

[0026] According to the above technical solution, the extrusion oil film damper load testing device of the present invention can achieve the following beneficial effects: it facilitates the decomposition and design of loads.

[0027] In an embodiment of the present invention, the load-bearing end of the upright of the load-bearing member, the load distribution member, and the inner ring force transmission member are arranged in the same plane.

[0028] According to the above technical solution, the extrusion oil film damper load testing device of the present invention can achieve the following beneficial effects: it facilitates the transfer, decomposition and design of loads.

[0029] In an embodiment of the present invention, an oil pressure retainer is also included. The oil pressure retainer includes an oil tank and an oil injection pipe. The oil injection pipe connects the oil tank and the extrusion oil film damper to maintain the oil film pressure in the extrusion oil film damper.

[0030] According to the above technical solution, the extrusion oil film damper load test device of the present invention can achieve the following beneficial effects: the oil film pressure in the extrusion oil film damper can be controlled and maintained by the oil pressure holder.

[0031] In embodiments of the present invention, the oil injection pipe and / or oil tank are marked with graduations to indicate the oil film pressure in the squeeze oil film damper.

[0032] According to the above technical solution, the extrusion oil film damper load test device of the present invention can achieve the following beneficial effects: the oil film pressure can be obtained through the scale on the oil pressure holder, which helps to reflect the influence of the oil film pressure of the extrusion oil film damper on its load transmission characteristics.

[0033] The present invention also proposes a method for testing the load transmission characteristics of an extrusion film damper using an extrusion film damper load testing apparatus according to any of the above embodiments, wherein the method includes: striking a load transmission component of the extrusion film damper load testing apparatus by firing a projectile at a predetermined speed, the load transmission component transmitting a load to an inner ring force transmission clamp, and the inner ring force transmission clamp applying the load to the extrusion film damper.

[0034] According to the above technical solution, the method for testing the load transmission characteristics of the extrusion oil film damper of the present invention can achieve the following beneficial effects: loads can be applied to the extrusion oil film damper in different load loading modes, thereby effectively testing the load transmission characteristics of the extrusion oil film damper under different loads, which helps to reflect the influence of the oil film pressure of the extrusion oil film damper on its load transmission characteristics.

[0035] In embodiments of the present invention, the method further includes setting the density and / or hardness of the bullet body in segments to simulate the ultimate load curve of the squeeze oil film damper under real working conditions.

[0036] According to the above technical solution, the method for testing the load transmission characteristics of the extrusion film damper of the present invention can achieve the following beneficial effects: it can simulate the ultimate load loading curve of the extrusion film damper under real working environment, apply load to the extrusion film damper with different load loading modes, and thus effectively test the load transmission characteristics of the extrusion film damper under different loads.

[0037] In an embodiment of the present invention, the load transfer assembly further includes a load decomposition assembly connected to the inner ring force transmission fixture for transferring a load decomposed at a predetermined angle to the inner ring force transmission fixture. The method further includes adjusting the load decomposition assembly of the extrusion oil film damper load test device to adjust the predetermined angle of the load transferred from the load decomposition assembly to the inner ring force transmission fixture.

[0038] According to the above technical solution, the method for testing the load transmission characteristics of the extrusion oil film damper of the present invention can achieve the following beneficial effects: a predetermined angle can be adjusted to apply load to the extrusion oil film damper in different load loading modes, thereby effectively testing the load transmission characteristics of the extrusion oil film damper under different loads.

[0039] In embodiments of the present invention, the method further includes adjusting one or more of a predetermined speed, a predetermined angle, and the density and / or hardness of the bullet body to apply a load to the extrusion oil film damper in different load loading modes.

[0040] According to the above technical solution, the method for testing the load transmission characteristics of the extrusion oil film damper of the present invention can achieve the following beneficial effects: loads can be applied to the extrusion oil film damper in different load loading modes, thereby effectively testing the load transmission characteristics of the extrusion oil film damper under different loads.

[0041] In an embodiment of the present invention, the load testing device for the extrusion oil film damper further includes an oil pressure holder, which includes an oil tank and an oil injection pipe. The oil injection pipe connects the oil tank and the extrusion oil film damper. The oil injection pipe and / or the oil tank are marked with scales to indicate the oil film pressure inside the extrusion oil film damper. The method further includes reading the oil film pressure reading, which helps to reflect the influence of the oil film pressure of the extrusion oil film damper on the load transmission characteristics.

[0042] According to the above technical solution, the method for testing the load transmission characteristics of the extrusion oil film damper of the present invention can achieve the following beneficial effects: it can obtain the value of the oil film pressure in the extrusion oil film damper, which helps to reflect the influence of the oil film pressure of the extrusion oil film damper on the load transmission characteristics.

[0043] It should be understood that the above description of the invention is provided to present a simplified version of the concepts further described in the detailed description. This does not imply the identification of key or essential features of the claimed subject matter, the scope of which is uniquely defined by the appended claims. Furthermore, the claimed subject matter is not limited to embodiments that address any of the shortcomings pointed out above or in any part of this disclosure. Attached Figure Description

[0044] Further features and exemplary embodiments of the invention, as well as its advantages, will be explained in more detail below with reference to the accompanying drawings. It will be understood that this embodiment does not exhaust the full scope of the invention. It will also be understood that some or all of the features described below may be combined in other ways, wherein:

[0045] Figure 1 A perspective schematic diagram of the load testing apparatus for the extrusion oil film damper according to the present invention is shown;

[0046] Figure 2 A partial cross-sectional view of the load testing apparatus for the extrusion oil film damper according to the present invention is shown;

[0047] Figure 3 A partial side view of the load testing apparatus for the extrusion oil film damper according to the present invention is shown;

[0048] Figures 4a to 4c Different load loading modes of the extrusion oil film damper load test apparatus according to the present invention are shown;

[0049] Figure 5 A schematic diagram of the load decomposition principle according to the present invention is shown.

[0050] List of reference numerals

[0051] 1. Load testing apparatus for extrusion oil film damper;

[0052] 2. Inner ring force transmission clamp;

[0053] 201 Inner ring force transmission base;

[0054] 202 Inner ring force transmission rod;

[0055] 3. Load decomposition components;

[0056] 301 Four-bar linkage;

[0057] 301a First shot;

[0058] 301b Second shot;

[0059] 301c Third stroke;

[0060] 301d, fourth shot;

[0061] 4. Load distribution components;

[0062] 401 Load Distribution Rod;

[0063] 5. Load-bearing components;

[0064] 501 Pole erection;

[0065] 502 Load-bearing end;

[0066] 503 Load-bearing rod;

[0067] 6. Extrusion oil film damper;

[0068] 601 Oil film;

[0069] 602 Oil inlet;

[0070] 603 Outer Ring Road;

[0071] 604 Inner Ring Road;

[0072] 605 End Cap;

[0073] 606 sealing ring;

[0074] 7. Support;

[0075] 8. Hydraulic retainer;

[0076] 801 fuel tank;

[0077] 802 oil injection pipe;

[0078] 9. Bullet body. Detailed Implementation

[0079] The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated. It is obvious that all features disclosed in this specification, or steps in all disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any manner. Any feature disclosed in this specification, unless specifically stated otherwise, can be replaced by other equivalent or similar features; that is, unless specifically described otherwise, each feature is merely one example of a series of equivalent or similar features. The technical solutions of the present invention will now be described in various aspects with reference to the figures and embodiments.

[0080] In this paper, the term "axial direction" refers to the direction parallel to the central axis of the extrusion film damper, "radial direction" refers to the direction parallel to and intersecting with a straight line perpendicular to the central axis of the extrusion film damper, and "circumferential direction" refers to the direction perpendicular to the central axis of the extrusion film damper and perpendicular to the cross-sectional radius.

[0081] In this article, the terms "inner side", "outer side", "inward", "outward", "proximal", and "far side" are used only to describe the relative positions of the elements.

[0082] In this document, the serial numbers “first”, “second”, etc. do not represent order (e.g., do not imply a sequential relationship unless explicitly stated) or priority or importance; the serial numbers are merely to indicate that they are different and independent devices, components or steps.

[0083] In this paper, the term "compression oil film damper" refers to a damper that effectively suppresses vibration by the compression and shearing action of the oil film generated by the movement and radial movement of the damper journal (inner ring).

[0084] In this paper, the term "load transmission characteristics" refers to the load attenuation characteristics after the load passes through the squeeze film damper, i.e., the relationship between the input load time history curve and the output load time history curve. For example, the load is an impact load.

[0085] Figure 1 A three-dimensional schematic diagram of the load testing apparatus 1 for the extrusion oil film damper according to the present invention is shown. Figure 1 The load testing apparatus 1 shown includes an inner ring force transmission clamp 2, a load transfer assembly, a bracket 7 for supporting the extrusion oil film damper 6, and an oil pressure retainer 8. To obtain the dynamic characteristics of the oil film transmitted load and eliminate interference from unnecessary factors, the extrusion oil film damper 6 may consist only of the oil film assembly, which will be discussed below in conjunction with... Figure 2 The structure of the squeeze film damper 6 is further described. The load transfer assembly includes a load decomposition assembly 3, a load distribution component 4, and a load-bearing component 5.

[0086] The squeeze film damper 6 includes an outer ring 603 and an inner ring 604 (see...) Figure 2 As shown in the figure, the bracket 7 includes a base and an opening as a support portion. The outer ring 603 of the squeeze film damper 6 is arranged inside the support portion of the bracket 7 and is surrounded and supported by the support portion, thereby being supported by the bracket 7. However, the bracket 7 may also have other structures that can fully or partially support the squeeze film damper 6, such as a structure that fully or partially surrounds or clamps the outer ring 603 in the circumferential direction.

[0087] The inner ring force transmission clamp 2 is arranged adjacent to the inner ring 604 of the extrusion oil film damper 6. Specifically, the inner ring force transmission clamp 2 includes an inner ring force transmission base 201 and an inner ring force transmission rod 202. The inner ring force transmission base 201 includes an outer peripheral surface and a side surface, and its outer peripheral surface is adjacent to the inner peripheral surface of the inner ring 604. In other words, the inner ring force transmission base 201 is surrounded by the inner ring 604 (in conjunction with...). Figure 2 (This will be better understood). The fixed end of the inner ring force transmission rod 202 is fixed to the inner ring force transmission base 201, preferably to the side surface of the inner ring force transmission base 201, and more preferably to the center of the side surface of the inner ring force transmission base 201, thereby facilitating load decomposition and design. Preferably, the inner ring force transmission rod 202 is fixed to the inner ring force transmission base 201 by a threaded connection. The free end of the inner ring force transmission rod 202 is connected to the load decomposition assembly 3, preferably pivotally connected to the load decomposition assembly 3. With this structure, the load decomposition assembly 3 can decompose and transfer the load to the inner ring force transmission rod 202, and then load it onto the inner ring 604 of the extrusion oil film damper 6 through the inner ring force transmission base 201, thereby allowing loads to be applied to the extrusion oil film damper 6 in different load loading modes, such as at different angles.

[0088] The load decomposition assembly 3 includes a four-bar linkage 301, preferably two sets of four-bar linkages 301 located on either side of the squeeze film damper 6. The bars in the four-bar linkage 301 are connected in pairs to form a quadrilateral, preferably pivotally connected in pairs. One corner of the quadrilateral is connected to the free end of the inner ring force transmission rod 202 of the inner ring force transmission clamp 2, while the opposite corner is connected to the load distribution member 4. The load decomposition assembly 3 is configured to adjust the predetermined angle of the load transmitted to the inner ring force transmission clamp 2 by adjusting the load decomposition assembly 3, which will be discussed in conjunction with... Figure 3 This will be further described. Through this construction, the load distribution member 4 distributes the load to the load decomposition assembly 3, which decomposes the load and transmits it to the inner ring force transmission rod 202. This allows for the application of loads to the extrusion oil film damper 6 in different load loading modes, such as at different angles. The following will combine this with... Figure 3This will be further described. Preferably, each link in the four-bar linkage 301 is a square bar with a square cross-section, but it can also be other types of links, such as round bars with a circular cross-section. Preferably, each link in the four-bar linkage 301 is made of a metallic material, but it can also be made of other materials with suitable strength, stiffness, and force transmission performance.

[0089] The load distribution member 4 includes load distribution rods 401, preferably two load distribution rods 401, extending to both sides of the squeeze film damper 6. One end of the load distribution rod 401 is connected to one corner of the four-bar linkage 301 of the load decomposition assembly 3, and the other end is connected to the load-bearing member 5. Preferably, the load distribution rod 401 is a square rod with a square cross-section, but it can also be other types of rods, such as a round rod with a circular cross-section. Preferably, the load distribution rod 401 is made of metal, but it can also be made of other materials with suitable strength, stiffness, and force transmission performance. Alternatively, the load distribution member 4 can be a Y-shaped load distribution fork 402 (see...). Figures 4a to 4c In other words, the load distribution member 4 may include a rod extending from the load-bearing member 5, the free end of which branches out toward both sides of the squeeze oil film damper 6 and is pivotally connected to one corner of the corresponding four-bar linkage 301.

[0090] The load-bearing component 5 includes a vertical rod 501, which has a fixed end and a load-bearing end 502. The fixed end of the vertical rod 501 is fixed to a fixed surface such as a test bench or the ground. The load-bearing end 502 is connected to one end of the load distribution rod 401 of the load distribution component 4. With this structure, when the load-bearing end 502 is subjected to a load, the load can be transferred from the load-bearing end 502 to the load distribution rod 401, and then sequentially transferred to the load decomposition component 3 and the inner ring force transmission fixture 2. The load is then applied to the inner ring 604 of the extrusion oil film damper 6 through the inner ring force transmission base 201, thereby allowing loads to be applied to the extrusion oil film damper 6 in different load loading modes, such as at different angles. Optionally, the load-bearing member 5 includes a vertical rod 501 and a load-bearing rod 503, which is supported by the vertical rod 501. For example, the load-bearing rod 503 is configured to pass through or be nested in the upper end (load-bearing end 502) of the vertical rod 501, and one end of the load-bearing rod 503 is connected to the load distribution rod 401, with the load applied to the other end of the load-bearing rod 503. Such a configuration helps to reduce load transmission loss.

[0091] In a preferred embodiment of the present invention, the load-bearing end 502 and / or load-bearing rod 503 of the load-bearing member 5, the load distribution member 4 and the inner ring force transmission rod 202 are arranged in the same plane, which facilitates the transmission, decomposition and design of the load.

[0092] The hydraulic pressure retainer 8 is used to control and maintain the oil film pressure in the extrusion oil film damper 6, preferably maintaining the oil film pressure equal to the oil film pressure under the working state of the extrusion oil film damper 6. The hydraulic pressure retainer 8 includes an oil tank 801 and an oil inlet pipe 802. The oil inlet pipe 802 connects the oil tank 801 to the extrusion oil film damper 6, and connects to the extrusion oil film damper 6 at the oil inlet 602 on the outer ring 603 of the extrusion oil film damper 6, thereby allowing the lubricating oil in the oil tank 801 to pass through the oil inlet 602. The oil tank 801 also has the function of storing the lubricating oil squeezed out under load, and its volume is equal to the oil film 601 in the extrusion oil film damper 6 (see...). Figure 2 All oil quantities are related to this. Preferably, the oil filling pipe 802 and / or the oil tank 801 are marked with graduations to indicate the oil film pressure within the extrusion oil film damper 6, which helps to reflect the influence of the oil film pressure of the extrusion oil film damper 6 on its load transmission characteristics. Specifically, Figure 1 The oil level height h shown is obtained by calculation: h = p / ρg, where p represents the oil film pressure, ρ represents the lubricating oil density, and g is the gravitational acceleration. According to this formula, the scale on the oil pressure holder 8 is calibrated to indicate the oil film pressure in the squeeze oil film damper 6.

[0093] Figure 2 This is a partial cross-sectional view of the extrusion film damper load testing device 1 according to the present invention, showing the inner ring force transmission clamp 2, the extrusion film damper 6, and the support 7. Figure 2 As shown, the compression oil film damper 6 includes an oil film 601, an oil inlet 602, an outer ring 603, an inner ring 604, an end cap 605, and a sealing ring 606. The gap between the oil film 601, the outer ring 603, and the inner ring 604 has a size ranging from, but not limited to, 0.1-0.2 mm. The oil inlet 602 and... Figure 1 The oil pressure retainer 5 shown is connected to the oil injection pipe 502. The squeeze oil film damper 6 includes two sealing rings 606 on the left and right sides, which can be used to confine the oil film 601 within a certain axial range. The squeeze oil film damper 6 includes end caps 605 arranged on both sides, which can be used to restrict the axial movement of the inner ring 604. The bracket 7 supports the outer ring 603. The inner ring force transmission base 201 of the inner ring force transmission clamp 2 is adjacent to the inner ring 604. Specifically, the outer peripheral surface of the inner ring force transmission base 201 is adjacent to the inner peripheral surface of the inner ring 604, which can be used to apply a load to the squeeze oil film damper 6. It is understood that the specific structure and dimensions of each component of the squeeze oil film damper 6 are not limited to those shown in the figure.

[0094] Figure 3 This is a partial side view of the load testing apparatus 1 for the squeeze film damper according to the present invention. (Combined with...) Figure 1 and 3As can be seen, the load decomposition assembly 3 includes a four-bar linkage 301, which comprises first, second, third, and fourth bars 301a, b, c, and d. These bars are connected in pairs to form a quadrilateral, preferably pivotally connected in pairs. One corner of the quadrilateral, such as the connection between the first bar 301a and the second bar 301b, is connected to the free end of the inner ring force transmission rod 202 of the inner ring force transmission clamp 2. The opposite corner, such as the connection between the third bar 301c and the fourth bar 301d, is connected. More specifically, the first, second, third, and fourth bars 301a, b, c, and d are pivotally connected in pairs via hinges, allowing each bar to be rotated to adjust to the desired angle. The hinges are then secured with fasteners such as bolts.

[0095] In a preferred embodiment of the invention, a load is applied to the load-bearing end 502 by a projectile 9 fired at a predetermined speed using a device such as an air cannon. The projectile 9 may include, but is not limited to, a cylindrical gelatin projectile, and its length is related to the load time and firing speed. By segmenting the density and / or hardness of the projectile 9, the ultimate load curve of the extrusion film damper 6 under real-world operating conditions can be simulated; for example, a low-density projectile 9 can simulate a small load force, while a high-density projectile 9 can simulate a large load force. Alternatively, the projectile 9 can also be a solid rubber tube, ensuring sufficient load loading time and allowing for reuse. It is understood that the load can also be applied controllably in other suitable ways. Figure 3 In the embodiment shown, a load is applied by segmenting the bullet body 9 with different densities / hardnesses. After the load F1 is transmitted to the load decomposition assembly 3, it is decomposed into loads F2 and F3 at predetermined angles, and then applied to the extrusion oil film damper 6 through the inner ring force transmission rod 202.

[0096] Figures 4a to 4c Different load loading modes of the extrusion film damper load testing apparatus 1 according to the present invention are shown. For example... Figure 4a and 4b As shown, the links in the four-bar linkage 301 are of equal length and are connected in pairs to form a rhombus shape. Thus, the four-bar linkage 301 is configured to decompose the load F1 into two equal loads F2 and F3 at an angle of 0-180° to each other. Figure 4c As shown, the lengths of the links in the four-bar linkage 301 are not exactly the same. The four-bar linkage 301 is configured to decompose the load F1 into two unequal loads F2' and F3' that are at an angle of 0-180° to each other.

[0097] Figure 5 a and 5b illustrate the load decomposition principle according to the present invention. Figure 5As shown in Figure a, when the links in the four-bar linkage 301 are connected in pairs to form a rhombus shape, α = β, and theoretically F2 = F3 = F1sinα. Figure 5 As shown in b, when each link in the four-bar linkage 301 is connected in pairs to form a non-rhomboid parallelogram shape, α≠β, and theoretically F2=F1sinα, F3=F1sinβ.

[0098] The following describes a method for testing the load transmission characteristics of an extrusion film damper 6 using the extrusion film damper load test apparatus 1 according to the present invention, with reference to a preferred embodiment of the present invention.

[0099] First, the density and / or hardness of the bullet body 9 are set in segments to simulate the ultimate load curve of the squeeze oil film damper 6 under real working conditions.

[0100] Secondly, adjust the angles between the rods in the load decomposition assembly 3, and then fix each hinge with fasteners to determine the load decomposition angles α and β.

[0101] Then, a predetermined bullet 9 is fired at a predetermined speed by a high-speed air cannon and hits the load-bearing end 502 of the load-bearing component 5, thereby applying a load to the load-bearing end 502. The load is transferred from the load-bearing end 502 to the load distribution rod 401, and then sequentially to the load decomposition component 3 and the inner ring force transmission clamp 2. The load is then applied to the inner ring 604 of the extrusion oil film damper 6 through the inner ring force transmission base 201, thereby achieving the application of a load to the extrusion oil film damper 6 with a predetermined load loading curve and a predetermined angle.

[0102] Finally, observe and record the load transmission characteristics of the squeeze oil film damper 6 and read and record the oil film pressure reading on the oil pressure holder 8.

[0103] Adjust the predetermined speed, predetermined angle, and one or more of the density and / or hardness of the bullet body 9, and repeat the above steps to obtain the load transmission characteristics of the extrusion oil film damper 6 under different load loading modes and the influence of oil film pressure on the load transmission characteristics.

[0104] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, structure, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, structure, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, structure, or apparatus that includes said element.

[0105] The description of the invention is given for illustrative and descriptive purposes only and is not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A load testing device for an extrusion film damper, used to test the load transmission characteristics of an extrusion film damper, the extrusion film damper load testing device comprising a support for supporting the extrusion film damper, the extrusion film damper comprising an outer ring and an inner ring, the outer ring being supported by the support, characterized in that, The load testing device also includes: An inner ring force-transmitting clamp, wherein the inner ring force-transmitting clamp is in contact with the inner circumferential surface of the inner ring, and is used to apply a load to the inner ring; and A load transfer assembly is connected to the inner ring force transmission fixture. The load transfer assembly bears the impact load and transfers the load to the inner ring force transmission fixture.

2. The load testing device for the extrusion oil film damper according to claim 1, characterized in that, The load transfer component includes: A load decomposition assembly, which is connected to the inner ring force transmission fixture, is used to transmit a load decomposed at a predetermined angle to the inner ring force transmission fixture. A load distribution component, which is connected to the load decomposition assembly, is used to distribute loads to the load decomposition assembly; A load-bearing component, which is connected to the load distribution component, is used to transfer load to the load distribution component.

3. The load testing device for the extrusion oil film damper according to claim 2, characterized in that, The inner ring force transmission fixture includes an inner ring force transmission base and an inner ring force transmission rod. The outer peripheral surface of the inner ring force transmission base is arranged to be adjacent to the inner peripheral surface of the inner ring. The inner ring force transmission rod includes a fixed end and a free end. The fixed end of the inner ring force transmission rod is fixed to the inner ring force transmission base, while the free end of the inner ring force transmission rod is connected to the load decomposition assembly.

4. The load testing device for the extrusion oil film damper according to claim 3, characterized in that, The load decomposition assembly includes a four-bar linkage.

5. The load testing device for the extrusion oil film damper according to claim 4, characterized in that, In the four-bar linkage, each bar is connected in pairs to form a quadrilateral, wherein one corner of the quadrilateral is connected to the free end of the inner ring force transmission bar, and the opposite corner is connected to the load distribution member.

6. The load testing device for the extrusion oil film damper according to claim 5, characterized in that, The load distribution component includes a load distribution rod, one end of which is connected to the four-bar linkage of the load decomposition assembly, and the other end is connected to the load-bearing component.

7. The load testing device for the extrusion oil film damper according to claim 6, characterized in that, The load-bearing component includes a pole, which has a fixed end and a load-bearing end, and the load distribution component is connected to the load-bearing end.

8. The load testing device for the extrusion oil film damper according to claim 7, characterized in that, The fixed end of the inner ring force transmission rod is fixed to the center of the inner ring force transmission base.

9. The load testing device for the extrusion oil film damper according to claim 8, characterized in that, The load-bearing end of the upright of the load-bearing component, the load distribution component, and the inner ring force transmission rod are arranged in the same plane.

10. The load testing apparatus for an extrusion film damper according to any one of claims 1 to 9, characterized in that, It also includes an oil pressure retainer, which includes an oil tank and an oil injection pipe. The oil injection pipe connects the oil tank and the extrusion oil film damper to maintain the oil film pressure in the extrusion oil film damper.

11. The load testing device for the extrusion oil film damper according to claim 10, characterized in that, The oil injection pipe and / or the oil tank are marked with graduations to indicate the oil film pressure in the squeeze oil film damper.

12. A method for testing the load transmission characteristics of an extrusion film damper using the extrusion film damper load testing device according to claim 1, characterized in that, The method includes: striking the load transfer component of the extrusion film damper load test device with a projectile body fired at a predetermined speed, the load transfer component transferring the load to an inner ring force transmission clamp, the inner ring force transmission clamp applying the load to the extrusion film damper.

13. The method according to claim 12, characterized in that, The method also includes setting the density and / or hardness of the bullet body in segments to simulate the ultimate load curve of the extrusion oil film damper under real working conditions.

14. The method according to claim 13, characterized in that, The load transfer assembly further includes a load decomposition assembly connected to the inner ring force transmission fixture for transmitting a load decomposed at a predetermined angle to the inner ring force transmission fixture. The method further includes adjusting the load decomposition assembly of the extrusion oil film damper load testing device to adjust the predetermined angle of the load transmitted from the load decomposition assembly to the inner ring force transmission fixture.

15. The method according to claim 14, characterized in that, The method further includes adjusting one or more of the predetermined speed, the predetermined angle, and the density and / or hardness of the bullet body to apply load to the extrusion oil film damper in different load loading modes.

16. The method according to claim 15, characterized in that, The load testing device for the extrusion oil film damper further includes an oil pressure retainer, which includes an oil tank and an oil injection pipe. The oil injection pipe connects the oil tank and the extrusion oil film damper. The oil injection pipe and / or the oil tank are marked with scales to indicate the oil film pressure inside the extrusion oil film damper. The method further includes reading the oil film pressure reading, which helps to reflect the influence of the oil film pressure of the extrusion oil film damper on the load transmission characteristics.

Images