A vibration suppression structure

Abstract

The present invention relates to a vibration suppression structure in the field of vibration control technology, comprising a shell and a vibration plate; the shell comprises a top plate, a side plate and a bottom plate, the top plate and the bottom plate are connected to form a cavity structure through the side plate, and the bottom plate is provided with a clamping opening; the vibration plate comprises a first vibrator plate and a second vibrator plate, the first vibrator plate and the second vibrator plate are integrally formed into a folding plate structure; the first vibrator plate is connected to the side of the clamping opening, the second vibrator plate is located between the top plate and the bottom plate, and the two opposite sides of the clamping opening are respectively connected to the vibration plates. The present invention forms a closed or semi-closed vibration suppression structure by wrapping a vibration plate with high parameter sensitivity with a shell, which can effectively prevent the resonant structure from being affected by external forces and causing the design frequency to shift, thereby improving the low-frequency vibration suppression effect.

Description

Technical Field

[0001] The present invention relates to the field of vibration control technology, in particular to a vibration suppression structure. Background Art

[0002] The high-level structural vibration and radiated noise generated by mechanical and electrical equipment, household appliances, transportation vehicles, industrial pipelines, building doors and windows, etc. under the excitation of power devices or external loads can damage people's hearing, cause fatigue damage to the structure, and endanger the safety of life and property. Among them, low-frequency structural vibration has a longer wavelength and stronger propagation ability, and effectively suppressing it requires a huge space and weight cost.

[0003] The existing structural vibration suppression technology is mainly based on the principle of dynamic vibration absorption. A "spring-mass" resonance system is added to the original vibration-suppressed part, and the inertial force generated when the resonance system resonates is used to significantly reduce the vibration amplitude of the original structure. In order to reduce the resonance frequency of the resonance system, the resonance system is required to have a smaller "spring" stiffness or a sufficiently large "mass". Therefore, most low-frequency vibration suppression structures require a larger size or a larger weight cost, and are not suitable for occasions with compact structures, small spaces or complex application scenarios. Moreover, the existing vibration suppression structures have obvious vibration suppression directionality and narrowband characteristics. At the same time, because these vibration suppression structures contain sensitive thin sheets that are greatly affected by external forces, it is difficult to meet the requirements of multi-directional vibration suppression, wide-band vibration suppression and stable service performance.

[0004] Through prior art search, it was found that the Chinese invention patent publication number is CN106678271A, which discloses a periodic structure based on local resonance band gap characteristics and with low-frequency vibration suppression performance, including periodically distributed mass elements, elastic elements and a matrix. The periodic unit includes a metal structure, namely a mass element, and the mass element is surrounded by a ring structure of rubber or silicone material, namely an elastic element. The circumferential side of the mass element is a curved surface with a certain shape, and the elastic element and the mass element are fitted to each other, and then the elastic element surrounds the mass element as a whole and is arranged periodically in the elastic structure matrix, wherein the elastic element and the matrix are also fitted to each other. This invention has the above-mentioned related problems. Summary of the invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a vibration suppression structure.

[0006] A vibration suppression structure provided according to the present invention includes a shell and a vibration plate;

[0007] The shell comprises a top plate, a side plate and a bottom plate, the top plate and the bottom plate are connected to form a cavity structure through the side plate, and the bottom plate is provided with a clamping opening;

[0008] The vibration plate includes a first vibration plate and a second vibration plate, and the first vibration plate and the second vibration plate are integrally formed into a folded plate structure;

[0009] The first oscillator plate is connected to the side of the clamping opening, the second oscillator plate is located between the top plate and the bottom plate, and the two opposite sides of the clamping opening are respectively connected to the oscillating plates.

[0010] In some implementations, a plurality of the first oscillator plates and / or a plurality of the second oscillator plates are connected to form one oscillator plate.

[0011] In some embodiments, the second vibrator plate is formed into a plurality of adjacent vibrating wings by slits.

[0012] In some embodiments, there are multiple vibration plates on the same side of the clamping opening and they are arranged at intervals, and the number of the vibration plates located on two opposite sides of the clamping opening is the same or different.

[0013] In some embodiments, the second oscillator plate is provided with a first microhole, and the number of the first microholes is multiple.

[0014] In some implementations, a mass block is further included, and the mass block is connected to the surface of the second oscillator plate.

[0015] In some embodiments, a sealing plate is further included, wherein the sealing plate is used to connect with the first oscillator plate located on both sides of the clamping opening to form a protrusion or a groove, and the second oscillator plate is enclosed in the shell.

[0016] In some embodiments, the top plate is provided with a plurality of second microholes.

[0017] In some implementations, the housing is filled with damping material.

[0018] In some implementations, the housing and the vibration plate are integrally formed.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention forms a closed or semi-closed vibration suppression structure by wrapping a vibration plate with high parameter sensitivity in a shell, which can effectively prevent the resonance structure from being affected by external forces and causing the design frequency to shift, thereby improving the low-frequency vibration suppression effect.

[0021] 2. The present invention improves the vibration suppression performance of the vibration suppression structure by optimizing the design of the overall structure of the vibration plate connected to the shell.

[0022] 3. The present invention reduces the overall operating frequency of the vibration plate and improves the low-frequency vibration suppression effect by optimizing the overall structure of the second vibrator plate in the vibration plate.

[0023] 4. The present invention forms a closed vibration suppression structure for the vibration plate connected to the shell, and takes further filling measures on the closed vibration suppression structure, thereby broadening the working frequency band of the vibration suppression structure.

[0024] 5. The present invention uses an integrated molding process for the shell and the vibration plate to avoid the problem of components falling off due to loose connections, thereby ensuring the vibration suppression effect of the vibration suppression structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0026] Figure 1 An overall schematic diagram of a vibration suppression structure of an arc-shaped structure shell provided by the present invention;

[0027] Figure 2 An overall schematic diagram of a vibration suppression structure of a rectangular structure shell provided by the present invention;

[0028] Figure 3 A schematic diagram of a multi-stage vibration plate structure provided by the present invention;

[0029] Figure 4 A schematic diagram of a gradual vibration plate structure provided by the present invention, wherein:

[0030] 4a is a schematic diagram showing a vibration plate structure that changes regularly from one end to the other end;

[0031] 4b is a schematic diagram showing a vibration plate structure that gradually narrows from both ends to the middle;

[0032] 4c is a schematic diagram showing a vibration plate structure that gradually narrows from the middle to both ends;

[0033] Figure 5 This is a schematic diagram of the structure of various embodiments of the present invention after the housing and the vibration plate are integrally formed, wherein:

[0034] 5a is a schematic diagram of the vertical structural vibration plate and the rectangular shell structure;

[0035] 5b is a schematic diagram showing a vertical structure in which the vibration plate and the bottom plate are in an inwardly concave arc shape;

[0036] 5c is a schematic diagram showing a vertical structure in which the vibration plate and the bottom plate are convex arc-shaped structures;

[0037] 5d is a schematic diagram of the arc-shaped vibration plate and the rectangular shell structure;

[0038] 5e is a schematic diagram of the angle structure vibration plate and the rectangular shell;

[0039] 5f is a schematic diagram of vibration plates and rectangular shells with different bending structures;

[0040] 5g is a schematic diagram showing a structure of a second vibrator plate and a rectangular shell in which the second vibrator plate is arranged in parallel up and down;

[0041] Figure 6 This is a technical effect diagram of the vibration suppression structure provided by the present invention being applied to a pipeline structure.

[0042] Figure 7 The vibration transmission characteristic experimental results of the vibration suppression structure provided by the present invention before and after being applied to the pipeline structure. DETAILED DESCRIPTION

[0043] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0044] Example 1

[0045] The present invention provides a suppression structure in which a resonator is placed in a housing, such as Figure 1-7 As shown, it includes a shell 1 and a vibration plate 2. The vibration plate 2 is the main component for suppressing low-frequency vibration. Part or all of the vibration plate 2 is placed in the shell 1. The shell 1 can effectively protect the main resonance structure of the vibration plate 2, prevent the resonance structure from being affected by external forces and causing the design frequency to shift, and improve the low-frequency vibration suppression effect. Specifically:

[0046] The shell 1 is mainly composed of a cavity structure surrounded by a top plate 11, a side plate 12 and a bottom plate 13, and the side plate 12 is located between the top plate 11 and the bottom plate 13. The shape of the shell 1 surrounding the cavity structure can be square, cylindrical, frustum-shaped, arc-shaped, irregular, etc., mainly depending on the structure required for low-frequency vibration suppression, the installation space and the overall structure of the vibration plate 2. A clamping opening 131 is opened on the bottom plate 13, and the clamping opening 131 is used for installing the vibration plate 2, and can also be used to clamp the structural parts to be vibration suppressed. The clamping opening 131 can be a longitudinal or transverse through-opening opened along the axial direction of the bottom plate 13, or it can be a partial opening.

[0047] The vibration plate 2 is composed of a first vibration plate 21 and a second vibration plate 22. The first vibration plate 21 is a vertical plate, and the second vibration plate 22 is a horizontal plate. The two are integrally formed into a vibration plate 2 with a folded plate structure. Here, the so-called folded plate structure refers to the angle between the first vibration plate 21 and the second vibration plate 22 at the connection point, and the size of the angle is between 0° and 180°. At the same time, the angle can also refer to the number of radians, that is, the first vibration plate 21 and the second vibration plate 22 are both arc transitions to form an arc-shaped folded plate structure. By adjusting the bending angle and height of the first vibration plate 21 and the second vibration plate 22, the bending of the thin film can be achieved, which can not only reduce the bending stiffness of the thin film in a limited space, thereby limiting and reducing the working frequency of the vibration plate 2, but also by changing the bending direction and angle of the two, the working frequency and the direction of action can be adjusted, thereby realizing the vibration suppression function of low resonance frequency and multiple resonance directions as a whole. The number of the first vibration plate 21 and the second vibration plate 22 in the vibration plate 2 can be multiple, such as Figure 3 As shown, the vibration plate 2 of the stepped multi-stage bending folded plate structure formed by two first vibration plates 21 and two second vibration plates 22 can also be formed into a curved bending shape by multiple first vibration plates 21 and then connected to the second vibration plates 22. Of course, the second vibration plate 22 can also be formed into a plurality of curved bending shapes or other configurations and then connected to one or more first vibration plates 21 in a corresponding shape. In addition, the second vibration plate 22 can be a gradual configuration, such as Figure 4 As shown in a-4c, it can gradually widen or narrow from one end to the other, or can regularly widen or narrow from both ends to the middle, etc., which can effectively broaden the working frequency band.

[0048] Multiple vibration plates 2 are connected to the clamping opening 131 in a symmetrical manner, specifically, the first vibration plate 21 is connected to the side of the clamping opening 131, and the connection method can be that the end face of the free end of the first vibration plate 21 facing away from the second vibration plate 22 is connected to the side end face of the clamping opening 131, and the second vibration plate 22 enters the shell 1 within the side of the clamping opening 131, that is, the second vibration plate 22 is located between the inner surface of the top plate 11 and the inner surface of the bottom plate 13. Under this connection method, the vibration plate 2 is basically completely located in the shell 1. The first vibrator plate 21 can also be connected to the side of the clamping opening 131 in such a way that the end surface of the free end of the first vibrator plate 21 facing away from the second vibrator plate 22 is located outside the clamping opening 131, the side of the clamping opening 131 is connected to the plate surface of the first vibrator plate 21, part of the first vibrator plate 21 is located outside the clamping opening 131, and the second vibrator plate 22 is still placed between the inner surface of the top plate 11 and the inner surface of the bottom plate 13, that is, part of the vibrator plate 2 is located inside the shell 1, and part is located outside the shell 1. In both connection situations, the first vibrator plate 21 is connected to the clamping opening 131, mainly for direct contact with the component to be vibration-suppressed, so as to facilitate direct transmission of vibration force. At the same time, whether the vibrator plate 2 is basically entirely located inside the shell 1, or partially located inside the shell 1, the second vibrator plate 22, which is the main resonant structure for the low-frequency suppression effect, is entirely located inside the shell 1 to ensure the protection of the shell 1 to the resonant structure and reduce the influence of external forces. Since the vibration plate parameters are highly sensitive and are easily deformed by external forces when exposed to the outside, resulting in a design frequency shift, wrapping it in a shell to form a closed or semi-closed vibration suppression structure can effectively ensure the accuracy of the design frequency of the resonant structure.

[0049] Example 2

[0050] This embodiment 2 is formed on the basis of embodiment 1, and the vibration suppression performance of the vibration suppression structure is improved by optimizing the overall structure of the vibration plate connected to the housing. Specifically:

[0051] like Figure 1-7 As shown, the number of vibration plates 2 connected to each side of the clamping opening 131 is multiple and arranged at intervals, preferably arranged side by side at intervals, that is, there is a certain gap between the second vibration plates 22. The number and structure of the vibration plates 2 located on the opposite sides of the clamping opening 131 are preferably symmetrically arranged. When located on each side of the clamping opening 131, multiple vibration plates 2 can be arranged side by side.

[0052] As a deformed structure, a plurality of parallel vibrating wings 221 are formed on the second vibrator plate 22 in the form of slits, and the plurality of parallel vibrating wings 221 are equivalent to a plurality of second vibrator plates 22 arranged side by side. In this case, the vibrating plate 2 is integrally formed by molding or other processes, that is, only one vibrating plate 2 can be connected to each of the two opposite sides of the clamping opening 131, which can greatly reduce the number of vibrating plates 2. The vibrating plates 2 designed with the vibrating wings 221 structure can also be arranged in a row on the side of the clamping opening 131, which can also reduce the number of vibrating plates 2 connected to the housing 2, and improve the overall vibration suppression performance by improving the stability of the structure.

[0053] Example 3

[0054] This embodiment 3 is formed on the basis of embodiment 1 or embodiment 2, and reduces the overall operating frequency of the vibration plate and improves the low-frequency vibration suppression effect by optimizing the overall structure of the second vibration plate in the vibration plate. Specifically:

[0055] like Figure 1-7 As shown, a first microhole 222 is provided on the second oscillator plate 22, and there are a plurality of first microholes 222. Preferably, the plurality of first microholes 222 are evenly distributed on the second oscillator plate 22. When a plurality of wing structures 221 are provided on the second oscillator plate 22, the first microholes 222 are distributed on the wing 221. The first microholes 222 are provided on the second oscillator plate 22, so as to further adjust the bending stiffness of the second oscillator plate 22, thereby reducing the overall operating frequency of the oscillator plate.

[0056] Further preferably, a mass block 3 is provided on the second oscillator plate 22, and the mass block 3 and the second oscillator plate 22 constitute the main resonant structure of the oscillator plate 2, which can effectively limit and reduce the overall operating frequency of the oscillator plate 2. The size and shape of the mass block 3 are mainly determined according to the vibration suppression frequency that the oscillator plate 2 needs to achieve. The position where the mass block 3 is connected to the second oscillator plate 22 can be the upper surface or the lower surface, and can be connected to the second oscillator plate 22 by gluing, riveting, welding, etc., or can be integrally formed with the second oscillator plate 22.

[0057] Example 4

[0058] This embodiment 4 is formed on the basis of any one of the embodiments 1-3, and a closed vibration suppression structure is formed for the vibration plate connected to the housing, and further filling and other measures are taken for the closed vibration suppression structure, thereby broadening the working frequency band of the vibration suppression structure. Specifically:

[0059] like Figure 1-7As shown, after the vibration plate 2 is connected to the side of the clamping opening 131 opened on the bottom plate 13, it is connected to the sealing plate 4 and the multiple first vibration plates 21 to form a closed cavity structure, so that the second vibration plate 22 is enclosed in the shell 1. Specifically, there are two main ways to connect the sealing plate 4 and the multiple first vibration plates 21: one way is that when the end of the first vibration plate 21 extends beyond the bottom plate 13 of the shell 1, the sealing plate 4 is sealed and connected to the end of each first vibration plate 21 to form a convex structure protruding from the outside of the shell 1, and the convex structure can be used to insert into the component to be vibration suppressed for vibration suppression; the other way is that the sealing plate 4 enters a certain distance from the clamping opening 131, and is sealed and connected to the first vibration plate 21 located above the clamping opening 131 to form a groove structure. At this time, whether the end of the first vibration plate 21 is located outside the shell 1, this connection method can be adopted to form a groove structure, and the groove structure can be used to clamp the component to be vibration suppressed for vibration suppression. In the two sealing connection modes, not only can the vibration be directly transmitted to the vibration plate 2 , but also the second vibration plate 22 can be sealed in the housing 1 .

[0060] After the second oscillator plate 22 is enclosed in the housing 1, a second micro hole 111 may be opened on the top plate 11 of the housing 1. The number of the second micro holes 111 is multiple and preferably evenly distributed on the top plate 11. A hole is opened on the top plate of the housing, and then the distance between the top plate 11 and the second oscillator plate 22 is designed. For example, when a mass block 3 is provided on the second oscillator plate 22, the distance between the top plate and the mass block is considered, and radiation damping can be introduced by means of the extrusion friction of air during vibration, thereby broadening the working frequency band of the vibration suppression structure.

[0061] When the second oscillator plate 22 is enclosed in the shell 1, another optimized way to broaden the working frequency band of the vibration suppression structure is to fill the sealed shell 1 with damping material, and when the second oscillator plate 22 vibrates, the damping of the entire vibration suppression structure is increased through the viscous damping effect generated by the damping material, thereby broadening the working frequency band of the vibration suppression structure. Preferably, the filled damping material is foam, cotton, fiber, liquid such as mineral oil, etc. When the damping material is foam, mineral oil, etc., the second micropores 111 are not provided on the top plate 11 to prevent leakage of the liquid. When filled with damping material, especially liquid, the second oscillator plate 22 is preferably provided with first micropores 222 to further improve the viscous damping effect through the porous effect.

[0062] Example 5

[0063] This embodiment 5 is formed on the basis of any one of the embodiments 1-4, and the housing and the vibration plate are integrally formed to avoid the problem of falling off caused by loose connection of the components, thereby ensuring the vibration suppression effect of the vibration suppression structure. Specifically:

[0064] like Figure 1-7As shown, the vibration suppression structure can be prepared as a whole by an integrated molding process, such as by compression molding with a corresponding mold, or by cutting and bending the plate material on a CNC machine tool for multiple times using a dedicated cutting and sheet metal equipment to form a complete integrated structure including a vibration plate of a mass block, a sealing plate and a shell, such as Figure 5 shown.

[0065] Test Results

[0066] Taking the vibration suppression structure set on the pipeline as an example, a vibration experiment is carried out. Figure 6 As shown in the figure, a vibration suppression structure is set on the pipeline, and the pipeline is supported by two brackets and fixed to the ground. Point A in the figure is the excitation point, and the exciter provides a 0Hz-1600Hz white noise signal as the vibration source input. A force sensor is placed at the connection between the output end of the exciter and the pipeline to pick up the excitation force signal input to the pipeline by the exciter; Point B is the response point, located at the far end of the pipeline, and the acceleration response signal is picked up by the acceleration sensor.

[0067] Figure 7 It is for Figure 6 The amplitude results of the vibration transfer function FRF (Frequency Response Function) of the pipeline structure before and after the vibration suppression structure is installed are shown. The vibration suppression effect of the vibration suppression structure is evaluated using FRF represented by acceleration. The calculation method is:

[0068]

[0069] Where a represents the vertical acceleration of the response point B, and F represents the input force of the excitation point A.

[0070] Figure 7 In the figure, the dotted line represents the FRF test result of the 1 mm thick aluminum pipe without the vibration suppression structure installed, and the solid line represents the situation after the vibration suppression structure described in Example 1 is attached. It can be clearly seen that after the vibration suppression structure is installed, the vibration amplitude transmitted to the response point is reduced at the low-frequency design frequency (190 Hz-265 Hz, bandwidth is 75 Hz). The use of the vibration suppression structure described in Example 1 can reduce the amplitude of the vibration transfer function of the pipeline by an average of about 20 dB in this frequency band, reflecting the vibration suppression effect of the vibration suppression structure.

[0071] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0072] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A vibration suppression structure, characterized in that: It comprises a housing (1) and a vibration plate (2); The housing (1) comprises a top plate (11), a side plate (12) and a bottom plate (13); the top plate (11) and the bottom plate (13) are connected to form a cavity structure via the side plate (12); and the bottom plate (13) is provided with a clamping opening (131); The vibration plate (2) comprises a first vibration plate (21) and a second vibration plate (22), wherein the first vibration plate (21) and the second vibration plate (22) are integrally formed into a folded plate structure; The first oscillator plate (21) is connected to the side of the clamping opening (131), the second oscillator plate (22) is located between the top plate (11) and the bottom plate (13), and the two opposite sides of the clamping opening (131) are respectively connected to the oscillation plates (2); The folded plate structure is as follows: an angle exists at the connection between the first vibrator plate (21) and the second vibrator plate (22), and the size of the angle is between 0° and 180°. Or there is an arc at the connection between the first vibrator plate (21) and the second vibrator plate (22), that is, the first vibrator plate (21) and the second vibrator plate (22) are both arc-shaped transitions to form an arc-shaped folded plate structure; a plurality of the first vibrator plates (21) and / or a plurality of the second vibrator plates (22) are connected to form one vibrator plate (2); It also comprises a sealing plate (4), wherein the sealing plate (4) is used to connect with the first vibrator plate (21) located on both sides of the clamping opening (131) to form a protrusion or a groove, and the second vibrator plate (22) is enclosed in the shell (1).

2. The vibration suppression structure according to claim 1, characterized in that: The second vibrator plate (22) is formed into a plurality of adjacent vibrating wings (221) by slits.

3. The vibration suppression structure according to claim 1 or 2, characterized in that: There are multiple vibration plates (2) on the same side of the clamping opening (131) and they are arranged at intervals, and the number of vibration plates (2) located on two opposite sides of the clamping opening (131) is the same or different.

4. The vibration suppression structure according to claim 3, characterized in that: The second oscillator plate (22) is provided with a first microhole (222), and the first microhole (222) is in plurality.

5. The vibration suppression structure according to claim 4, characterized in that: It also comprises a mass block (3), wherein the mass block (3) is connected to the surface of the second oscillator plate (22).

6. The vibration suppression structure according to claim 1, characterized in that: The top plate (11) is provided with a plurality of second microholes (111).

7. The vibration suppression structure according to claim 1 or 6, characterized in that: The shell (1) is filled with damping material.

8. The vibration suppression structure according to any one of claims 1-2 or 4-6, characterized in that: The shell (1) and the vibration plate (2) are integrally formed.

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