Novel shock absorber and system based on sine function curved beam and magnetorheological damper
By combining a sinusoidal curved beam with a magnetorheological damper, the problem of stiffness hardening of the damper under overload is solved, achieving stable vibration reduction performance under high load capacity and wide linear range, suitable for overload and large amplitude environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-27
- Publication Date
- 2026-04-03
AI Technical Summary
Under overload or large amplitude, existing metal-rubber vibration dampers exhibit stiffness hardening, which leads to a significant reduction in vibration damping performance and a narrow linear range, making it difficult to balance high load-bearing capacity and a wide linear range.
By combining a sinusoidal curved beam with a magnetorheological damper, the linear range is widened by adjusting the parameters of the sinusoidal function and the multi-layer curved beam design. The damping magnitude is adjusted by the magnetorheological damper to achieve high load-bearing capacity and low natural frequency.
It maintains vibration reduction performance under overload conditions, has a wide linear range and high load-bearing capacity, and the stiffness of the vibration damper remains unchanged, adapting to large deformation and impact environments.
Smart Images
Figure CN121782318A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of vibration damper technology, and more specifically to a novel vibration damper and system based on a sinusoidal curved beam and a magnetorheological damper. Background Technology
[0002] With the rapid development of science and technology, the requirements for vibration damping systems in precision instruments, military equipment, and special equipment are becoming increasingly stringent. For vibration damping systems installed on platforms subject to overload, they bear not only the weight of the load itself but also the acceleration overload. Under overload conditions, the natural frequency of vibration damping systems designed with metal-rubber damping devices will change significantly, leading to a substantial decrease in vibration damping performance. The main reason is the narrow linear range of the damper; under overload conditions, the damper exhibits hardening characteristics, meaning its stiffness increases. Taking metal-rubber dampers as an example, this type of damper is the most common in airborne platforms. Based on current research, metal-rubber dampers exhibit strong stiffness nonlinearity and only show good application performance under gravity loads; however, under overload conditions, their vibration damping performance decreases significantly.
[0003] In view of the above, this application is hereby submitted. Summary of the Invention
[0004] The technical problem this invention aims to solve is that vibration dampers exhibit stiffness hardening under overload or large amplitude conditions, leading to a significant reduction in damping performance. The purpose of this invention is to provide a novel vibration damper and system based on a sinusoidal curved beam and a magnetorheological damper, which maintains damping performance even under overload conditions. This novel vibration damper exhibits good linearity during large deformations and also possesses good load-bearing capacity while improving linearity.
[0005] This invention is achieved through the following technical solution:
[0006] In a first aspect, the present invention provides a novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper, the novel vibration damper comprising:
[0007] The first connection structure is used to connect the first end of the object being damped.
[0008] The sine function curved beam comprises multiple curved beams constructed from sine functions, with a wide linear range obtained by changing the parameters of the sine functions; one end of each curved beam is connected to a first connecting structure, and the other end is connected to a second connecting structure;
[0009] The damper, as the damping energy dissipation unit of the novel vibration damper, has its two ends connected to a first connecting structure and a second connecting structure, respectively.
[0010] The second connection structure is used to connect the second end of the object being damped.
[0011] Furthermore, the sinusoidal curved beam is constructed by creating a curve of the curved beam using a sine function, offsetting the curve by a preset distance to obtain a plane, and stretching the plane to a preset width to obtain a machinable curved beam structure.
[0012] Furthermore, the parameters of the sine function include amplitude, period, phase, thickness, or width.
[0013] Furthermore, by changing the parameters of the sine function, a wide linear interval can be obtained, including:
[0014] Increasing the amplitude of the sine function increases the linear interval and decreases the load-bearing capacity.
[0015] Increasing the number of periods in a sine function increases the linear interval and decreases the carrying capacity.
[0016] Increasing the thickness of the sine function increases the load-bearing capacity and decreases the linear interval.
[0017] Increasing the width of the sine function increases the load-bearing capacity while keeping the size of the linear interval unchanged.
[0018] By changing the phase of the sine function, different types of trigonometric functions are obtained.
[0019] Furthermore, the sinusoidal curved beam is a multi-layered curved beam, which achieves high load-bearing capacity by stacking multiple identical curved beams layer by layer.
[0020] Furthermore, the damper is a magnetorheological damper, and the damping magnitude is adjusted by controlling the magnitude of the current according to the usage requirements.
[0021] Furthermore, multiple sinusoidal curved beams are arranged around the damper.
[0022] Furthermore, one end of each curved beam is bolted to the first connecting structure, and the other end is bolted to the second connecting structure.
[0023] Furthermore, the two ends of the damper are respectively connected to the first connection structure and the second connection structure via ball joints.
[0024] Secondly, the present invention provides a vibration reduction system based on a sinusoidal curved beam and a magnetorheological damper. The vibration reduction system includes an airborne platform and an infrared imaging device. A vibration damper is provided between the airborne platform and the infrared imaging device to isolate the vibration of the airborne platform from being transmitted to the infrared imaging device.
[0025] The vibration damper mentioned above is a novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper.
[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0027] 1. This invention relates to a novel vibration damper and system based on a sinusoidal function curved beam and a magnetorheological damper. The key point of this invention is the sinusoidal function curved beam. The curved beam constructed by the sinusoidal function can achieve a wide linear range by designing parameters such as the amplitude, period, and phase of the function, and can maintain the stiffness of the vibration damper under high overload.
[0028] 2. This invention relates to a novel vibration damper and system based on a sinusoidal curved beam and a magnetorheological damper. The structural characteristics of the sinusoidal curved beam allow for the combination of multiple curved beams. This stackability enables the curved beam vibration damper to have both high load-bearing capacity and low natural frequency. Vibration dampers based on a single elastic unit are difficult to achieve both low natural frequency and high load-bearing capacity due to limitations in structural strength. However, the method of combining multiple curved beams can significantly reduce the stress level of individual components, and achieve high overall load-bearing capacity through multi-layer combination.
[0029] 3. The present invention is a novel vibration damper and system based on a sinusoidal curved beam and a magnetorheological damper. The magnetorheological damper can compensate for the small damping of the sinusoidal curved beam vibration damper, and can provide variable damping characteristics. Moreover, the damping magnitude of the magnetorheological damper is not affected by overload. Attached Figure Description
[0030] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:
[0031] Figure 1 This is a schematic diagram of the novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper according to the present invention;
[0032] Figure 2 This is a three-dimensional structural schematic diagram of the novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper according to the present invention;
[0033] Figure 3 The diagram shows a sinusoidal curved beam of the present invention. (a) shows a multi-layer curved beam combination design, and (b) shows a single-layer curved beam design.
[0034] Figure 4 The axial mechanical test results of this invention are shown in (a) quasi-static force-displacement curve and (b) dynamic frequency sweep curve.
[0035] Figure 5 This is a schematic diagram of the vibration reduction system based on a sinusoidal curved beam and a magnetorheological damper according to the present invention.
[0036] Figure reference numerals and corresponding component names:
[0037] 100 - First connecting structure; 101 - Sine function curved beam; 102 - Damper; 103 - Second connecting structure;
[0038] 200-Airborne platform, 201-Infrared imaging equipment, 202-Shock absorber. Detailed Implementation
[0039] In the following, the terms “comprising” or “may include” as used in various embodiments of the invention indicate the presence of an inventive function, operation, or element, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in various embodiments of the invention, the terms “comprising,” “having,” and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or adding one or more combinations of the foregoing.
[0040] In various embodiments of the invention, the expression "or" or "at least one of A and / or B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A and / or B" may include A, may include B, or may include both A and B.
[0041] The expressions used in the various embodiments of the present invention (such as "first," "second," etc.) may modify various constituent elements in the various embodiments, but do not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only used for the purpose of distinguishing one element from other elements. For example, a first user device and a second user device refer to different user devices, although both are user devices. For example, a first element may be referred to as a second element without departing from the scope of the various embodiments of the present invention, and similarly, a second element may also be referred to as a first element.
[0042] It should be noted that if a description is made of "connecting" one component to another, then the first component can be directly connected to the second component, and a third component can be "connected" between the first and second components. Conversely, when a component is "directly connected" to another component, it can be understood that there is no third component between the first and second components.
[0043] The terminology used in the various embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to limit the various embodiments of the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the invention pertain. The terms (such as those defined in a generally used dictionary) are to be interpreted as having the same meaning as in the context of the relevant technical field and are not to be interpreted as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of the invention.
[0044] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.
[0045] Under overload conditions or with large amplitude, vibration dampers exhibit stiffness hardening, leading to a significant decrease in damping performance. This is primarily due to the narrow linear range of the damper, necessitating its widening. Furthermore, to cope with overload conditions, dampers should possess high load-bearing capacity; however, their linearity is often limited by load-bearing capacity, indicating a coupling relationship between load-bearing capacity and linear range. To maintain damping performance under overload conditions, dampers should possess both high load-bearing capacity and a wide linear range. On the other hand, under overload conditions, the damping of metal-rubber dampers increases significantly, resulting in a decrease in damping effectiveness. Therefore, effectively controlling damper damping is a crucial way to improve damping performance.
[0046] Example 1
[0047] like Figure 1 and Figure 2 As shown, this invention relates to a novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper. This novel vibration damper includes:
[0048] The first connecting structure 100 is used to connect the first end of the object being damped;
[0049] The sine function curved beam 101 includes multiple curved beams constructed from sine functions, and a wide linear interval is obtained by changing the parameters of the sine functions; one end of each curved beam is connected to the first connecting structure 100 and the other end is connected to the second connecting structure 103;
[0050] The damper 102 serves as the damping energy dissipation unit of the novel vibration damper, with its two ends connected to the first connecting structure 100 and the second connecting structure 103, respectively.
[0051] The second connection structure 103 is used to connect the second end of the object being damped.
[0052] The key point of this invention is the sine function curved beam. The sine function curved beam 101 is a curved beam constructed from a sine function. A wide linear range can be achieved by designing parameters such as the amplitude A, period φ, phase φ, thickness t, and width d of the sine function. Under high overload conditions, the stiffness of the damper can remain unchanged.
[0053] In this embodiment, the sine function curved beam passes through a sine function. A curved beam curve is constructed, the curve is offset by a preset distance to obtain a plane, and the plane is stretched to a preset width to obtain a machinable curved beam structure.
[0054] In this embodiment, a wide linear interval is obtained by changing the parameters of the sine function, including:
[0055] When the amplitude A of the sine function is increased, the linear interval becomes larger and the load-bearing capacity becomes smaller.
[0056] When the number of periods φ of the sine function is increased, the linear interval becomes larger and the carrying capacity becomes smaller.
[0057] When the thickness t of the sine function is increased, the load-bearing capacity increases and the linear interval decreases;
[0058] Increasing the width d of the sine function increases the load-bearing capacity, but does not affect the size of the linear interval; that is, the size of the linear interval remains unchanged.
[0059] By changing the phase of the sine function, different types of trigonometric functions are obtained.
[0060] In this embodiment, high load-bearing capacity can be achieved through a multi-layer curved beam combination design. The sinusoidal curved beam 101 adopts a multi-layer curved beam design, achieving high load-bearing capacity by stacking multiple identical curved beams layer by layer. Figure 3 As shown, Figure 3 (a) is a multi-layered curved beam composite design. Figure 3 (b) Design for a single-layer curved beam. Specifically, the sinusoidal curved beam passes through a sinusoidal function. A curved beam curve is constructed, and the curve is offset by a preset distance to obtain a plane. The plane is then stretched to a preset width to obtain a machinable curved beam structure. Based on the above, a multi-layer curved beam design can be achieved by stacking multiple identical curved beams. The more layers there are, the greater the load-bearing capacity, and the load-bearing range is unlimited.
[0061] Therefore, the sinusoidal function curved beam vibration damper solves the problem of a narrow linear range and improves the load-bearing capacity of the damper. The characteristics of the curved beam can be designed using parameters (amplitude, period, phase, thickness, width, etc.), and the number of curved beam layers can be determined according to the load size and can be any positive integer. The array pattern and number of multi-layer curved beams can also be arbitrarily designed according to requirements.
[0062] In this embodiment, the damper 102 is a magnetorheological damper. The damping magnitude is adjusted by controlling the current according to the usage requirements. For example, when dealing with impacts and high-magnitude vibrations, the current can be increased to reduce the vibration amplitude and quickly stabilize the object being damped.
[0063] In this embodiment, since the vibration damper can be used in multiple axes, while the magnetorheological damper is only used in the axial direction, the magnetorheological damper is connected to the first connecting structure 100 and the second connecting structure 103 via a ball joint. The end face of the vibration damper has threaded holes for connection with the object being damped and the fixed end. One end of each curved beam is bolted to the first connecting structure 100, and the other end is bolted to the second connecting structure 103.
[0064] In specific implementation, such as Figure 2 As shown, the first connecting structure 100 and the second connecting structure 103 can be in the shape of a regular hexagonal prism. The upper end of the damper 102 in the middle is connected to the first connecting structure 100 and the lower end is connected to the second connecting structure 103. Correspondingly, there are 6 sine function curved beams 101, which are arranged around the damper 102. The two ends of each sine function curved beam 101 are connected to the lower part of the corresponding facet of the first connecting structure 100 and the second connecting structure 103.
[0065] It should be noted that if the first connecting structure 100 and the second connecting structure 103 can be in the shape of a regular octagonal prism, then there are correspondingly 8 sinusoidal curved beams 101. Other similar arrangements exist.
[0066] Furthermore, the structural form of curved beams is not limited to sine functions; curved beams constructed using other functions that can achieve multi-layer combinations in terms of structural form can also achieve similar effects.
[0067] This invention can maintain its original characteristics under overload conditions. Taking the existing design parameters of this invention as an example, the rated load mass of the vibration damper is 50 kg. Figure 4 As shown in (b), the frequency sweep test shows that the vibration damping system's frequency is 12Hz, and it can still maintain 10Hz under acceleration overload of -10g to 10g. The effective height of the vibration damper is 100mm, and the effective stroke is 40mm. Figure 4As shown in (a), the vibration damper exhibits linear variation within a motion range of -20mm to 20mm, meaning its stiffness remains constant. Compared to other types of vibration dampers, this design offers a wider linear range while maintaining high load-bearing capacity, capable of withstanding forces from -5000N to 5000N, with a weight of only 3kg. This vibration damper not only allows axial movement but also has the same horizontal travel, thus enabling its use as a triaxial damper. It eliminates the need for ball joints or similar structures at both ends, making it more suitable for engineering applications. Besides handling overload conditions, the sinusoidal beam vibration damper can also be used in environments with large amplitude vibrations and impacts.
[0068] The sinusoidal curved beam of this invention is constructed using a sinusoidal function curve. The cross-section of the sinusoidal curved beam is obtained by offsetting the curve. By adjusting the number of periods, length, and width of the sinusoidal curved beam, the axial and lateral stiffness and linearity of the vibration damper can be changed. By stacking the number of layers of the sinusoidal curved beam, the load-bearing capacity of the vibration damper can be increased. Different damping can be obtained by adjusting the current of the magnetorheological damper.
[0069] Example 2
[0070] like Figure 5 As shown, the difference between this embodiment and embodiment 1 is that this embodiment provides a vibration reduction system based on a sinusoidal curved beam and a magnetorheological damper. The vibration reduction system includes an airborne platform 200 and an infrared imaging device 201. A vibration damper 202 is provided between the airborne platform 200 and the infrared imaging device 201 to isolate the vibration of the airborne platform 200 from being transmitted to the infrared imaging device 201.
[0071] The vibration damper 202 adopts the novel vibration damper based on the sinusoidal function curved beam and magnetorheological damper mentioned above.
[0072] The imaging clarity, measurement accuracy, and stability of airborne infrared imaging equipment are closely related to the vibration environment of the airborne platform. To address the problem of decreased imaging clarity caused by vibration in airborne infrared imaging equipment, this invention designs a vibration reduction system based on a sinusoidal curved beam, such as... Figure 5As shown, a novel vibration damper of Embodiment 1 is installed between the airborne platform 200 and the infrared imaging device 201 to isolate the vibration of the airborne platform 200 from being transmitted to the infrared imaging device 201. The vibration damping system of this invention combines high load-bearing capacity, a wide linear range, and a low natural frequency, thus achieving high-performance vibration damping while maintaining its performance during airborne platform maneuvering flight. Furthermore, due to the large travel distance of the vibration damper, the system also provides excellent buffering during aircraft takeoff and landing. Within the buffer travel distance, the vibration damper remains in a low-stiffness range and does not enter a hard-limit range, thus significantly attenuating the impact acceleration response amplitude transmitted to the optoelectronic device (e.g., the infrared imaging device 201), playing a crucial role in protecting sensitive internal components of the optoelectronic device.
[0073] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper, characterized in that, This new type of vibration damper includes: The first connecting structure (100) is used to connect the first end of the object being damped; The sine function curved beam (101) includes multiple curved beams constructed from sine functions, and a wide linear interval is obtained by changing the parameters of the sine functions; one end of each curved beam is connected to the first connecting structure (100) and the other end is connected to the second connecting structure (103). The damper (102) serves as the damping energy dissipation unit of the novel vibration damper, with the first connecting structure (100) and the second connecting structure (103) connected to its two ends respectively. The second connection structure (103) is used to connect the second end of the object being damped.
2. The novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper according to claim 1, characterized in that, The sinusoidal curved beam (101) is a curved beam constructed by a sinusoidal function. The curve is offset by a preset distance to obtain a plane, and the plane is stretched to a preset width to obtain a machinable curved beam structure.
3. The novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper according to claim 1, characterized in that, The parameters of the sine function include amplitude, period, phase, thickness, or width.
4. The novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper according to claim 3, characterized in that, By changing the parameters of the sine function, a wide linear interval can be obtained, including: Increasing the amplitude of the sine function increases the linear interval and decreases the load-bearing capacity. Increasing the number of periods in a sine function increases the linear interval and decreases the carrying capacity. Increasing the thickness of the sine function increases the load-bearing capacity and decreases the linear interval. Increasing the width of the sine function increases the load-bearing capacity while keeping the size of the linear interval unchanged. By changing the phase of the sine function, different types of trigonometric functions are obtained.
5. The novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper according to claim 1, characterized in that, The sinusoidal curved beam (101) is a multi-layered curved beam, which achieves high load-bearing capacity by stacking multiple identical curved beams layer by layer.
6. The novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper according to claim 1, characterized in that, The damper (102) is a magnetorheological damper, and the damping magnitude is adjusted by controlling the magnitude of the current according to the usage requirements.
7. The novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper according to claim 1, characterized in that, Multiple sinusoidal curved beams (101) are arranged around the damper (102).
8. The novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper according to claim 1, characterized in that, One end of each curved beam is bolted to the first connecting structure (100), and the other end is bolted to the second connecting structure (103).
9. The novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper according to claim 1, characterized in that, The damper (102) is connected to the first connecting structure (100) and the second connecting structure (103) at both ends by ball joints.
10. A vibration reduction system based on a sinusoidal curved beam and a magnetorheological damper, characterized in that, The vibration reduction system includes an airborne platform (200) and an infrared imaging device (201). A vibration damper (202) is provided between the airborne platform (200) and the infrared imaging device (201) to isolate the vibration of the airborne platform (200) from being transmitted to the infrared imaging device (201). The vibration damper (202) is a novel vibration damper based on a sinusoidal curved beam and a magnetorheological damper as described in any one of claims 1 to 9.