Negative Poisson's ratio structure and damping device
By designing an acoustic black hole structure and a damping layer in the negative Poisson's ratio structure, the vibration reduction and noise reduction effect of the negative Poisson's ratio structure is optimized, solving the problem of poor vibration reduction and energy absorption effect in the existing technology and achieving better vibration reduction performance.
Patent Information
- Application Number
- CN202520139337.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Existing negative Poisson's ratio structures vary considerably in their vibration reduction and energy absorption effects, and need to be optimized to improve vibration reduction and noise reduction.
Design a negative Poisson's ratio structure in which the ring is connected by a connecting beam that extends tangentially along the ring and has a recessed portion in the thickness direction at the middle part of the length direction to form an acoustic black hole structure, thereby reducing the propagation speed of mechanical waves and reducing reflection at the boundary end. A damping layer can be optionally added to absorb energy.
It significantly reduces the propagation speed of mechanical waves, reduces reflection at the boundary end, forms a high energy density region, enhances the vibration reduction and noise reduction effect, and further absorbs energy through the damping layer to improve the vibration reduction effect.
Smart Images
Figure CN223578647U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a damping technology field especially relates to a negative poisson's ratio structure and damping device. BACKGROUND
[0002] The negative poisson's ratio structure is a kind of special material or design, its characteristics are when being subjected to tensile force, material not only will be elongated in the direction of applied force, and also will occur expansion in the direction perpendicular to applied force;On the contrary, when being subjected to compression force, material will shrink in the vertical direction.
[0003] Therefore, negative poisson's ratio structure is often used in damping structure, with good damping effect, but different negative poisson's ratio structure damping energy-absorbing effect difference is larger, need to optimize and improve negative poisson's ratio structure, so that it can exert better damping energy-absorbing effect. UTILITY MODEL CONTENTS
[0004] The utility model at least solves one of the technical problems existing in the prior art.The utility model provides a negative poisson's ratio structure, which optimizes the negative poisson's ratio structure and enhances the effect of damping and noise reduction.
[0005] The utility model further provides a damping device, which comprises the negative poisson's ratio structure described above
[0006] The negative poisson's ratio structure according to the utility model embodiment comprises: a ring part, the ring part is spaced apart multiple;Connecting beam, any adjacent two ring parts are connected by the connecting beam, the connecting beam extends along the tangential direction of the ring part, and at least part of the connecting beam has a recessed portion on at least one side of the middle part in the thickness direction of the length direction.
[0007] According to the negative poisson's ratio structure of the utility model embodiment, any adjacent two ring parts are connected by the connecting beam, the connecting beam extends along the tangential direction of the ring part, and at least part of the connecting beam has a recessed portion on at least one side of the middle part in the thickness direction of the length direction, so that the recessed portion of the connecting beam forms an acoustic black hole structure, thereby effectively reducing the propagation speed of mechanical waves in the negative poisson's ratio structure, significantly reducing the reflection of the boundary end, forming a region with high energy density, optimizing the negative poisson's ratio structure and enhancing the effect of damping and noise reduction.
[0008] In some embodiments of the utility model, the distance between x point on the inner wall surface of the recessed portion and the center surface in the thickness direction of the connecting beam is h (x), h (x) = Ax m +h minwherein x≥0, m≥2, x is the minimum distance between the projection of the lowest point of the recess on the center plane and the projection of the x point on the center plane, h min is the distance between the lowest point of the recess and the center plane in the thickness direction of the connecting beam, and the lowest point of the recess is higher than the center plane in the thickness direction of the connecting beam.
[0009] In some embodiments of the utility model, the maximum thickness of the connecting beam is h, h / 10≤h min ≤h / 5, and 1mm≤h min .
[0010] In some embodiments of the utility model, the recesses are two, and the two recesses are respectively arranged on the two sides of the connecting beam in the thickness direction and oppositely arranged.
[0011] In some embodiments of the utility model, the negative Poisson's ratio structure unit further comprises a damping layer, the damping layer is arranged in the recess, and the damping layer covers at least part of the inner wall surface of the recess.
[0012] In some embodiments of the utility model, the damping layer is a rubber layer or a foam layer.
[0013] In some embodiments of the utility model, the ring parts are arranged in multiple rows and multiple columns.
[0014] In some embodiments of the utility model, two adjacent ring parts in the same column are connected by one connecting beam, and / or two adjacent ring parts in the same row are connected by one connecting beam.
[0015] In some embodiments of the utility model, a plurality of connecting beams are connected on the circumferential wall of the ring part and are spaced apart in the circumferential direction of the ring part, and the plurality of connecting beams include at least one group of connecting beams, each group of connecting beams includes two connecting beams oppositely arranged in the radial direction of the ring part and parallel and extending in opposite directions.
[0016] The damping device according to the embodiments of the utility model comprises the negative Poisson's ratio structure.
[0017] According to the damping device of the embodiments of the utility model, the negative Poisson's ratio structure is arranged, any two adjacent ring parts are connected by the connecting beam, the connecting beam extends in the tangential direction of the ring part, at least part of the connecting beam has the recess on at least one side of the middle part in the length direction, the recess of the connecting beam forms the acoustic black hole structure, the propagation speed of the mechanical wave in the negative Poisson's ratio structure is effectively reduced, the reflection of the boundary end is significantly reduced, the area with high energy density is formed, the negative Poisson's ratio structure is optimized, and the damping and noise reduction effect is enhanced.
[0018] The additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description of embodiments in accordance with the present application. BRIEF DESCRIPTION OF DRAWINGS
[0019] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings, in which:
[0020] Figure 1 is a front view of a negative Poisson's ratio structure according to an embodiment of the present application;
[0021] Figure 2 is a partial enlarged view of a negative Poisson's ratio structure according to an embodiment of the present application;
[0022] Figure 3 is a schematic view of a connecting beam of a negative Poisson's ratio structure according to an embodiment of the present application.
[0023] REFERENCE NUMERALS
[0024] 10, negative Poisson's ratio structure;
[0025] 1, ring portion;
[0026] 2, connecting beam; 21, recessed portion;
[0027] 3, damping layer;
[0028] 4, central surface;
[0029] 5, connecting plate. DETAILED DESCRIPTION
[0030] Embodiments of the present application are described in detail below with reference to the attached drawings, which show examples of embodiments of the present application. Identical or similar components are denoted throughout the various drawings with the same reference numerals, and a repeated description of the same components is omitted. The embodiments described below are examples for explaining the present application, and should not be construed as limiting the present application.
[0031] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.
[0032] In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0033] Reference is made below Figures 1-3 The negative Poisson's ratio structure 10 according to the embodiments of the utility model is described.
[0034] As Figures 1-3 shown, the negative Poisson's ratio structure 10 according to the embodiments of the utility model comprises: a ring part 1 and a connecting beam 2.
[0035] Specifically, referring to Figures 1-3 , the ring part 1 is spaced apart; any two adjacent ring parts 1 are connected by the connecting beam 2, the connecting beam 2 extends along the tangential direction of the ring part 1, and at least one side of the middle part of the connecting beam 2 in the length direction has a recess 21 in the thickness direction.
[0036] It can be understood that at least one side of the middle part of the connecting beam 2 in the length direction has a recess 21 in the thickness direction, and the inner wall surface of the recess 21 is a curved surface, so that the recess 21 of the connecting beam 2 is formed as an acoustic black hole structure, thereby effectively reducing the propagation speed of mechanical waves (especially bending waves) at the recess 21, thereby reducing the propagation speed of mechanical waves in the connecting beam 2, thereby reducing the propagation speed of mechanical waves between the plurality of ring parts 1, significantly reducing the reflection of the boundary end, forming a region with high energy density, thereby enhancing the vibration and noise reduction effect. Thus, the negative Poisson's ratio structure 10 is optimized, and the vibration and noise reduction effect of the negative Poisson's ratio structure 10 is enhanced.
[0037] Further, as shown in Figure 2 and Figure 3 , along the length direction of the connecting beam 2, the thickness of the connecting beam 2 at the recess 21 first decreases and then increases, so that one recess 21 of the connecting beam 2 can be formed as two acoustic black hole structures connected along the length direction of the connecting beam 2, and through the joint action of the two acoustic black hole structures, thereby further reducing the propagation speed of mechanical waves in the negative Poisson's ratio structure 10, significantly reducing the reflection of the boundary end, thereby further enhancing the vibration and noise reduction effect.
[0038] According to the negative Poisson's ratio structure 10 of the embodiment of the utility model, the two adjacent ring parts 1 are connected by the connecting beam 2, the connecting beam 2 extends along the tangential direction of the ring part 1, at least one side of the middle part of the connecting beam 2 in the length direction has a recess 21 in the thickness direction, so that the recess 21 of the connecting beam 2 is formed as an acoustic black hole structure, thereby effectively reducing the propagation speed of mechanical waves in the negative Poisson's ratio structure 10, significantly reducing the reflection of the boundary end, forming a region with high energy density, optimizing the negative Poisson's ratio structure 10, and enhancing the vibration and noise reduction effect.
[0039] In some embodiments of the utility model, as shown in Figure 3 , the spacing between the x point on the inner wall surface of the recess 21 and the center surface 4 of the thickness direction of the connecting beam 2 is h (x), h (x) = Ax m +h min , wherein x is greater than or equal to 0, m is greater than or equal to 2, x is the minimum distance between the projection of the lowest point of the recess 21 on the center surface 4 and the projection of the x point on the center surface 4, h min is the distance between the lowest point of the recess 21 and the center surface 4 of the thickness direction of the connecting beam 2, and the lowest point of the recess 21 is higher than the center surface 4 of the thickness direction of the connecting beam 2.
[0040] It can be understood that the spacing between the x point on the inner wall surface of the recess 21 and the center surface 4 of the thickness direction of the connecting beam 2 is h (x), h (x) = Ax m +h min, so that the connecting beam 2 at the recess 21 can be subjected to a power distribution, thereby being better formed into an acoustic black hole structure, so that the acoustic black hole property is better utilized, thereby further reducing the propagation speed of mechanical waves in the negative Poisson's ratio structure 10, significantly reducing the reflection of the boundary end, forming a region with high energy density, optimizing the negative Poisson's ratio structure 10, and enhancing the effect of vibration and noise reduction.
[0041] Further, as shown in Figure 3 , the lowest point of the recess 21 is higher than the center surface 4 in the thickness direction of the connecting beam 2, that is, the distance between the lowest point of the recess 21 and the center surface 4 in the thickness direction of the connecting beam 2 is greater than 0, thereby, in the case that the connecting beam 2 has recesses 21 on both sides of the middle part in the length direction of the connecting beam 2 in the thickness direction, the connecting beam 2 can be avoided being cut off by the two recesses 21.
[0042] It should be noted that when the connecting beam 2 at the recess 21 is formed into a one-dimensional acoustic black hole structure (for example, the utility model), the recess 21 of the connecting beam 2 penetrates the connecting beam 2 along the width direction of the connecting beam 2; when the connecting beam 2 at the recess 21 is formed into a two-dimensional acoustic black hole structure, the recess 21 is formed into a conical recess, and the one-dimensional acoustic black hole and the two-dimensional acoustic black hole are familiar to those skilled in the art, which will not be described in detail here.
[0043] In some embodiments of the utility model, the maximum thickness of the connecting beam 2 is h, and h / 10≤h min ≤h / 5, for example, h min may be h / 10, 3h / 20 or h / 5, and the like, thereby, on the one hand, the strength of the connecting beam 2 at the lowest point of the recess 21 is ensured, and on the other hand, a good cutting effect on mechanical waves can be ensured.
[0044] Further, 1mm≤h min , for example, hminmay be 1mm, 2mm, 3mm or 4mm, and the like, thereby facilitating the processing of the process.
[0045] In some embodiments of the utility model, as shown in Figures 1-3 , the recess 21 is two, and the two recesses 21 are respectively arranged on both sides of the connecting beam 2 in the thickness direction and oppositely arranged. Thus, the acoustic black hole structure can be formed on both sides of the connecting beam 2 in the thickness direction, thereby further reducing the propagation speed of mechanical waves in the negative Poisson's ratio structure 10, significantly reducing the reflection of the boundary end, forming a region with high energy density, optimizing the negative Poisson's ratio structure 10, and enhancing the effect of vibration and noise reduction.
[0046] In some embodiments of the utility model, as shown in Figure 2 and Figure 3As shown, the negative Poisson's ratio structure 10 unit further comprises: a damping layer 3, the damping layer 3 is arranged in the recess 21, and the damping layer 3 covers at least part of the inner wall surface of the recess 21. It can be understood that the damping layer 3 can effectively dissipate mechanical wave energy. When the mechanical wave enters the acoustic black hole structure and is guided to the damping layer 3, the damping material can absorb part of the energy of the mechanical wave and convert it into heat energy. The presence of the damping layer 3 reduces the reflection of sound waves inside the acoustic black hole structure, which means that fewer sound waves are reflected back into the environment, thereby reducing the noise level.
[0047] Further, as shown in Figure 2 and Figure 3 , the number of damping layers 3 is equal to the number of recesses 21, for example, in the utility model, the recesses 21 are two, and the damping layers 3 are also two corresponding to the two recesses 21.
[0048] In some embodiments of the utility model, the damping layer 3 is a rubber layer or a foam layer. Among them, the foam layer can be a VHB (Very High Bonding, very high strength bonding) foam layer.
[0049] In some embodiments of the utility model, the thickness of the damping layer 3 is 2-4 times, for example, 2 times, 3 times, 3.5 times or 4 times, etc., of the thickness of the recess 21, thereby ensuring the thickness of the damping layer 3, thereby ensuring the absorption effect of the damping layer 3 on the mechanical wave, and further ensuring the noise reduction and vibration reduction effect. min
[0050] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 , the plurality of ring parts 1 are arranged in multiple rows and multiple columns. Thus, the negative Poisson's ratio structure 10 can absorb energy in multiple directions, improving the vibration reduction effect.
[0051] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 , the two ring parts 1 adjacent in the same column are connected by a connecting beam 2; thus, the setting of the connecting beam 2 can be reduced, on the one hand, the deformation space of the negative Poisson's ratio structure 10 is ensured, the vibration reduction effect is ensured, and on the other hand, the cost can be reduced.
[0052] In some embodiments of the utility model, as shown in Figure 1 and Figure 2 , the two ring parts 1 adjacent in the same row are connected by a connecting beam 2. Thus, the setting of the connecting beam 2 can be reduced, on the one hand, the deformation space of the negative Poisson's ratio structure 10 is ensured, the vibration reduction effect is ensured, and on the other hand, the cost can be reduced.
[0053] In some embodiments of the utility model, as shown in Figure 1 andFigure 2 As shown, the plurality of connecting beams 2 are connected to the peripheral wall of the ring part 1 and are spaced apart in the circumferential direction of the ring part 1, and the plurality of connecting beams 2 include at least one group of connecting beams 2, and each group of connecting beams 2 includes two connecting beams 2 that are oppositely arranged in the radial direction of the ring part 1 and are parallel and extend in opposite directions.
[0054] It can be understood that, by the above arrangement, when the negative Poisson's ratio structure 10 is elongated in a certain direction due to tensile deformation, the two connecting beams 2 in one group of connecting beams 2 will deform and move towards each other, thereby driving the ring part 1 to rotate and deform, so that the two connecting beams 2 in the remaining group of connecting beams 2 will deform and move towards each other, thereby causing the negative Poisson's ratio structure 10 to also deform and elongate in another direction. Thus, through the transmission of deformation and movement, internal friction is generated during deformation, and vibration energy is converted into heat energy through internal friction, thereby achieving a damping effect.
[0055] The following describes the stress deformation of the negative Poisson's ratio structure 10 by way of examples as shown in the drawings. Figure 2 As shown in the drawings, in the utility model, two groups of connecting beams 2 are connected to the peripheral wall of each ring part 1, which are a first group of connecting beams 2 and a second group of connecting beams 2, the first group of connecting beams 2 includes two connecting beams 2 arranged on both sides of the ring part 1 in the up-down direction, and the second group of connecting beams 2 includes two connecting beams 2 arranged on both sides of the ring part 1 in the left-right direction. When the negative Poisson's ratio structure 10 is subjected to tension in the left-right direction, the two connecting beams 2 in the second group of connecting beams 2 will deform and move towards each other, thereby causing the negative Poisson's ratio structure 10 to elongate in the left-right direction as a whole, and at this time, the movement of the second group of connecting beams 2 causes the ring part 1 to rotate and deform, thereby driving the two connecting beams 2 in the first group of connecting beams 2 to deform and move away from each other, thereby causing the negative Poisson's ratio structure 10 to elongate in the up-down direction as a whole.
[0056] In some embodiments of the utility model, as shown in the drawings, Figure 1 and Figure 2 As shown in the drawings, the negative Poisson's ratio structure 10 further includes two connecting plates 5 that are oppositely arranged and spaced apart, and the plurality of ring parts 1 and the plurality of connecting beams 2 are arranged between the two connecting plates 5, and the ring part 1 closest to one side of the connecting plate 5 is connected to the connecting plate 5 through the connecting beam 2.
[0057] The following describes a damping device according to an embodiment of the utility model.
[0058] The damping device according to an embodiment of the utility model includes the above-mentioned negative Poisson's ratio structure 10.
[0059] According to the damping device of the embodiment of the utility model, the negative Poisson's ratio structure 10 is arranged, the two ring parts 1 are connected through the connecting beam 2, the connecting beam 2 extends along the tangential direction of the ring part 1, at least one side of the thickness direction of the middle part of the length direction of the connecting beam 2 has the recessed part 21, the recessed part 21 of the connecting beam 2 forms the acoustic black hole structure, thereby effectively reducing the propagation speed of mechanical wave in the negative Poisson's ratio structure 10, significantly reducing the reflection of the boundary end, forming the area with high energy density, optimizing the negative Poisson's ratio structure 10, and enhancing the effect of damping and noise reduction.
[0060] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0061] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.
Claims
1. A negative Poisson's ratio structure, characterized in that, include: The ring portion is a plurality of spaced-apart portions; A connecting beam is provided, which connects any two adjacent ring portions. The connecting beam extends tangentially to the ring portion, and at least one side of the middle portion in the length direction of the connecting beam has a recess in the thickness direction.
2. The negative Poisson's ratio structure according to claim 1, characterized in that, The distance between point x on the inner wall of the recess and the center plane of the connecting beam in the thickness direction is h(x), where h(x) = Ax m +h min Where x≥0, m≥2, x is the minimum distance between the projection of the lowest point of the concave portion onto the central plane and the projection of point x onto the central plane, and h min The distance between the lowest point of the recess and the center plane of the connecting beam in the thickness direction is given, wherein the lowest point of the recess is higher than the center plane of the connecting beam in the thickness direction.
3. The negative Poisson's ratio structure according to claim 2, characterized in that, The maximum thickness of the connecting beam is h, where h / 10 ≤ h min ≤h / 5, and 1mm≤h min .
4. The negative Poisson's ratio structure according to claim 1, characterized in that, There are two recessed portions, which are respectively located on both sides of the thickness direction of the connecting beam and are arranged opposite to each other.
5. The negative Poisson's ratio structure according to claim 1, characterized in that, The negative Poisson's ratio structure also includes: A damping layer is disposed within the recess and covers at least a portion of the inner wall surface of the recess.
6. The negative Poisson's ratio structure according to claim 5, characterized in that, The damping layer is a rubber layer or a foam layer.
7. The negative Poisson's ratio structure according to claim 1, characterized in that, The multiple rings are arranged in multiple rows and columns.
8. The negative Poisson's ratio structure according to claim 7, characterized in that, Two adjacent ring sections in the same column are connected by a connecting beam. And / or, two adjacent ring portions in the same row are connected by a connecting beam.
9. The negative Poisson's ratio structure according to claim 1, characterized in that, The circumferential wall of the ring is connected to a plurality of connecting beams spaced apart along the circumferential direction of the ring. The plurality of connecting beams includes at least one set of connecting beams, and each set of connecting beams includes two connecting beams that are parallel to each other in the radial direction of the ring and extend in opposite directions.
10. A vibration damping device, characterized in that, Includes the negative Poisson's ratio structure according to any one of claims 1-9.