Bidirectional negative Poisson's ratio local resonance cell element and super-beam structure composed of bidirectional negative Poisson's ratio local resonance cell element

Abstract

The utility model relates to a bidirectional negative Poisson's ratio local resonance cell and a super beam structure formed by the same, and the cell comprises a first negative Poisson's ratio structure, a second negative Poisson's ratio structure, a local resonance structure, and a substrate. The first negative Poisson's ratio structure, the second negative Poisson's ratio structure and the local resonance structure are respectively connected with the base body; the first negative Poisson's ratio structure and the second negative Poisson's ratio structure are located on the two adjacent side faces in the circumferential direction of the base body, and the local resonance structure is arranged in the hollow part of the base body. The first negative Poisson's ratio structure is a bidirectional negative Poisson's ratio structure, and the first vibration reduction direction of the first negative Poisson's ratio structure is perpendicular to the second vibration reduction direction; the first vibration reduction direction is parallel to the third vibration reduction direction of the second negative Poisson's ratio structure. The bidirectional negative Poisson's ratio local resonance cell element has a negative Poisson's ratio effect and a local resonance effect at the same time, and can provide effective design guidance for vibration reduction and isolation of a light beam structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of vibration control technology especially relates to a kind of two-way negative poisson's ratio local resonance cell and the super beam structure of the composition thereof. BACKGROUND

[0002] In the field of aerospace, ship, train and vehicle, vibration characteristics will directly affect the reliability, safety and fatigue life of equipment, at the same time, the noise generated by vibration also greatly reduces the comfort of the working environment of relevant personnel, so the importance of vibration control is self-evident.

[0003] For the control problem of vibration of various equipment, the traditional vibration reduction and isolation technology mainly uses larger weight, size (thickness) of acoustic material, so as to realize good vibration reduction and noise reduction performance in low frequency range, and the additional weight, installation space of acoustic measure of actual equipment has strict limitation (especially the requirement of light weight of aerospace equipment is extremely high).Therefore, under the actual engineering constraint conditions of weight, space and the like, the traditional acoustic material is still difficult to break through the low-frequency high-efficiency vibration reduction and noise reduction performance bottleneck problem, which seriously restricts the improvement of vibration / noise quality of equipment, and even affects the upgrading of equipment.

[0004] In recent years, the proposal and development of negative poisson's ratio metamaterial and local resonance phononic crystal metamaterial concept provide a new technical approach for solving the vibration reduction and noise reduction bottleneck technical problem.Negative poisson's ratio metamaterial has excellent mechanical properties, including excellent shear resistance, impact resistance, fracture resistance, energy absorption and vibration isolation performance, and has important application value in individual protection and impact resistance, vibration reduction and energy absorption fields;Local resonance phononic crystal metamaterial is a new type of artificial periodic functional material, which has good elastic wave band gap and waveguide characteristics, and has wide application prospect in the field of vibration reduction and noise reduction.

[0005] The existing negative poisson's ratio structure is generally used for impact absorption and energy absorption, and only has one-way negative poisson's ratio effect, and is not much applied in the field of vibration reduction and noise reduction.At the same time, the structure combining negative poisson's ratio structure and local oscillator is very few.Therefore, a negative poisson's ratio structure with better use performance is urgently needed. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a two-way negative poisson's ratio local resonance cell and the super beam structure of the composition thereof.

[0007] To realize the above-mentioned utility model purpose, the utility model provides a two-way negative poisson's ratio local resonance cell, which comprises: a first negative poisson's ratio structure, a second negative poisson's ratio structure, a local resonance structure and a matrix.

[0008] The matrix is a hollow block with a plurality of side surfaces in the circumferential direction;

[0009] The first negative Poisson's ratio structure, the second negative Poisson's ratio structure and the local resonance structure are connected with the base body respectively; wherein, the first negative Poisson's ratio structure and the second negative Poisson's ratio structure are located on two sides of the base body which are circumferentially adjacent, and the local resonance structure is arranged in the hollow part of the base body;

[0010] The first negative Poisson's ratio structure is a bidirectional negative Poisson's ratio structure, wherein, the first damping direction of the first negative Poisson's ratio structure is perpendicular to the second damping direction.

[0011] The first damping direction is parallel to the third damping direction of the second negative Poisson's ratio structure.

[0012] According to an aspect of the utility model, the first negative Poisson's ratio structure is a closed ring structure, which comprises: a first damping part and a second damping part;

[0013] The first damping part and the second damping part are distributed along the ring and are connected alternately; wherein, two first damping parts are arranged oppositely in the first damping direction, and two second damping parts are arranged oppositely in the second damping direction.

[0014] According to an aspect of the utility model, the first damping part comprises: a first connecting piece and a first inclined piece;

[0015] The first inclined piece is arranged at opposite ends of the first connecting piece respectively, wherein, the end of the first inclined piece and the end of the first connecting piece are fixedly connected with each other, and the two first inclined pieces are arranged in a direction of approaching each other.

[0016] The second damping part comprises: a second connecting piece and a second inclined piece;

[0017] The second inclined piece is arranged at opposite ends of the second connecting piece respectively, wherein, the end of the second inclined piece and the end of the second connecting piece are fixedly connected with each other, and the two second inclined pieces are arranged in a direction of approaching each other.

[0018] Between the adjacent first damping part and the second damping part, the end of the first inclined piece and the end of the second inclined piece are fixedly connected with each other, and the first inclined piece and the second inclined piece are arranged with an included angle.

[0019] According to an aspect of the utility model, the included angle between the first inclined piece and the second inclined piece α Satisfies: 10° ≤α <180°.

[0020] According to one aspect of the utility model, first connecting piece, first inclined piece, second connecting piece and second inclined piece are respectively plate -shaped piece, and its thickness is 1mm to 3mm.

[0021] According to one aspect of the utility model, second negative poisson's ratio structure includes: bearing piece and arc piece;

[0022] In third damping direction, bearing piece is provided with two mutually parallel;

[0023] In the direction perpendicular to third damping direction, the opposite two arc pieces are provided with two, and the opening of two arc pieces is opposite;

[0024] Along third damping direction, the end of arc piece and the end of bearing piece are mutually fixedly connected.

[0025] According to one aspect of the utility model, the arc included angle formed between arc piece and bearing piece β Satisfy: 10° ≤β <90°.

[0026] According to one aspect of the utility model, arc piece and bearing piece are respectively plate -shaped piece, and its thickness is 0.5mm to 2mm.

[0027] According to one aspect of the utility model, the local resonance structure includes: vibrator, rubber sleeve arranged outside the vibrator;

[0028] The ratio of the outer dimension of rubber sleeve and the outer dimension of vibrator is 2:1.

[0029] To realize the above-mentioned utility model purpose, the utility model provides a kind of super beam structure using the bidirectional negative poisson's ratio local resonance unit of preceding, comprising: unit array and the outer surrounding structure surrounded in the unit array;

[0030] A plurality of bidirectional negative poisson's ratio local resonance units are provided in the unit array;

[0031] The bidirectional negative poisson's ratio local resonance unit includes: first negative poisson's ratio structure, second negative poisson's ratio structure, local resonance structure and matrix;

[0032] The matrix is hollow block with multiple sides in circumferential direction;

[0033] First negative poisson's ratio structure, second negative poisson's ratio structure and local resonance structure are respectively connected with matrix;Wherein, first negative poisson's ratio structure and second negative poisson's ratio structure are on two circumferentially adjacent sides of matrix, and local resonance structure is arranged in the hollow portion of matrix;

[0034] The first negative Poisson's ratio structure is a bidirectional negative Poisson's ratio structure, wherein the first negative Poisson's ratio structure is arranged perpendicularly to a first vibration reduction direction and a second vibration reduction direction;

[0035] The first vibration reduction direction is arranged in parallel with a third vibration reduction direction of the second negative Poisson's ratio structure;

[0036] If the bidirectional negative Poisson's ratio local resonance unit is arranged in a horizontal direction, then adjacent bidirectional negative Poisson's ratio local resonance units are connected to each other based on the first negative Poisson's ratio structure and the base body, if the bidirectional negative Poisson's ratio local resonance unit is arranged in a vertical direction, then adjacent bidirectional negative Poisson's ratio local resonance units are connected to each other based on the second negative Poisson's ratio structure and the base body, and the first negative Poisson's ratio structures arranged above and below each other are connected to each other.

[0037] According to a scheme of the present application, the bidirectional negative Poisson's ratio local resonance unit simultaneously has a negative Poisson's ratio effect and a local resonance effect, and can provide effective design guidance for lightweight beam structure vibration reduction.

[0038] According to a scheme of the present application, the present application combines a negative Poisson's ratio structure and a local resonance structure to construct a unit cell structure having a bidirectional negative Poisson's ratio effect and a local resonance effect.

[0039] According to a scheme of the present application, the bidirectional negative Poisson's ratio local resonance unit in the present application can be used to realize various super beam structures, and effectively ensures the flexibility of use of the present application.

[0040] According to a scheme of the present application, the super beam structure of the present application can arrange bidirectional negative Poisson's ratio local resonance units in horizontal and vertical directions, has the advantages of large stiffness, low mass, good vibration reduction effect, and impact resistance and energy absorption, etc.

[0041] According to a scheme of the utility model, when the super beam structure is excited by horizontal and vertical external loads, the overall structure will vibrate and micro-deform, because the negative Poisson's ratio structure has a wave transformation effect, the stress wave propagation characteristics of the structure will be changed, so that the vibration wave is reflected and interfered in the structure multiple times, thereby weakening its propagation ability. At the same time, the negative Poisson's ratio structure will deform to the inside under the action of the load, and at the same time, the negative Poisson's ratio effect is generated, which will also dissipate the energy input from the outside. The rubber and vibrator of the local resonance structure can be equivalent to a spring and mass block structure, which can produce a local resonance band gap when it resonates, and can dissipate a large amount of vibration energy. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a structural diagram of a bidirectional negative Poisson's ratio local resonance unit according to an embodiment of the utility model;

[0043] Figure 2 is a perspective view of a super beam structure according to an embodiment of the utility model;

[0044] Figure 3 is a side view of a super beam structure according to an embodiment of the utility model. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0046] When describing the embodiments of the utility model, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" express the orientation or positional relationship shown in the relevant drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the utility model.

[0047] The utility model will be described in detail below in combination with the drawings and specific embodiments, and the embodiments cannot be described one by one here, but the embodiments of the utility model are not limited to the following embodiments.

[0048] As Figure 1As shown, according to an embodiment of the utility model, a kind of bidirectional negative poisson ratio local resonance cell of the utility model, comprising: first negative poisson ratio structure 1, second negative poisson ratio structure 2, local resonance structure 3 and matrix 4;In this embodiment, matrix 4 is hollow block with multiple lateral faces in circumferential direction;Wherein, first negative poisson ratio structure 1, second negative poisson ratio structure 2 and local resonance structure 3 are connected with matrix 4 respectively;Wherein, first negative poisson ratio structure 1 and second negative poisson ratio structure 2 are on the circumferential adjacent two sides of matrix 4, and local resonance structure 3 is arranged in the hollow portion of matrix 4.In this embodiment, first negative poisson ratio structure 1 is bidirectional negative poisson ratio structure, wherein the first damping direction of first negative poisson ratio structure 1 is vertically arranged with the second damping direction;First damping direction is arranged in parallel with the third damping direction of second negative poisson ratio structure 2.

[0049] As shown, Figure 1 According to an embodiment of the utility model, matrix 4 can be arranged as rectangular block, whereby, first negative poisson ratio structure 1, second negative poisson ratio structure 2 can be arranged on the circumferential two adjacent sides of matrix 4 respectively, to facilitate the distribution of the damping direction of first negative poisson ratio structure 1, second negative poisson ratio structure 2, effectively simplify the overall structure of the utility model, improve the overall structural compactness.

[0050] As shown, Figure 1 According to an embodiment of the utility model, first negative poisson ratio structure 1 is closed annular structure, and it includes: first damping portion 11 and second damping portion 12;Wherein, first negative poisson ratio structure 1 is based on the first damping portion 11 and second damping portion 12 of mutual connection constitutes a whole cross-shaped symmetrical structure, specifically, first damping portion 11 and second damping portion 12 are distributed along ring, and are connected alternately in sequence;Wherein, first damping portion 11 is oppositely provided with two in first damping direction, and second damping portion 12 is oppositely provided with two in second damping direction.

[0051] As shown, Figure 1As shown, according to an embodiment of the utility model, first damping part 11 includes: first connecting piece 111 and first inclined piece 112, wherein, first inclined piece 112 is arranged at opposite ends of first connecting piece 111 respectively, wherein, the end of first inclined piece 112 is fixedly connected with the end of first connecting piece 111, and two first inclined pieces 112 are arranged in the direction of approaching each other, further, second damping part 12 includes: second connecting piece 121 and second inclined piece 122, wherein, second inclined piece 122 is arranged at opposite ends of second connecting piece 121 respectively, wherein, the end of second inclined piece 122 is fixedly connected with the end of second connecting piece 121, and two second inclined pieces 122 are arranged in the direction of approaching each other, in the embodiment, the end of first inclined piece 112 and the end of second inclined piece 122 are fixedly connected between adjacent first damping part 11 and second damping part 12, and first inclined piece 112 and second inclined piece 122 have an included angle.

[0052] In the embodiment, the size of first damping part 11 and second damping part 12 can be set to be different or the same, for example, the length of first connecting piece 111 can be greater than the length of first inclined piece 112, and the length of first inclined piece 112 is less than the length of second inclined piece 122, so that the entire first negative Poisson's ratio structure 1 presents a cross ring structure with a length greater than a height.

[0053] Further, the ends of first inclined piece 112 and second inclined piece 122 are fixedly connected in a circular arc transition mode to realize the elimination of stress at the connection position and ensure the reliable stability of the connection position, in addition, the circular arc transition structure at the connection position can also realize the corresponding elastic connection effect to effectively facilitate the force transmission effect in the vibration isolation process.

[0054] Further, the connection mode of first inclined piece 112 and second inclined piece 122 can make first inclined piece 112 and second inclined piece 122 form an included angle α , so that the included angle α between first inclined piece 112 and second inclined piece 122 satisfies: 10° ≤α <180°.

[0055] Through the above setting, the negative Poisson's ratio effect of first negative Poisson's ratio structure 1 is effectively ensured, if the included angle α is less than 10°, the value is too small, so that the negative Poisson's ratio effect of first negative Poisson's ratio structure 1 is too weak to meet the use needs, if the included angle α is greater than or equal to 180°, the value is too large, which easily leads to the loss of negative Poisson's ratio effect of first negative Poisson's ratio structure 1, and it is difficult to play the corresponding use performance.

[0056] As Figure 1 shown, according to an embodiment of the present application, the first negative Poisson's ratio structure 1 is integrated with the base 4, specifically, the integration with the side of the base 4 can be realized through the second connecting piece 121 of one of the second damping parts 12, so as to ensure the connection reliability of the first negative Poisson's ratio structure 1 and the base 4.

[0057] As Figure 1 shown, according to an embodiment of the present application, the first connecting piece 111, the first inclined piece 112, the second connecting piece 121 and the second inclined piece 122 are respectively plate-shaped pieces, and the thickness thereof is 1mm to 3mm.

[0058] Through the above setting, the rationality of the overall quality is effectively ensured under the condition of the structural strength of the first negative Poisson's ratio structure 1, if the thickness is less than 1mm, the structural strength of the first negative Poisson's ratio structure 1 is too low, and it is difficult to play a stable and reliable supporting role, if the thickness is greater than 3mm, the mass of the first negative Poisson's ratio structure 1 is too heavy, especially in the case of being combined to form a larger super beam structure, the increase of the overall mass is more obvious.

[0059] As Figure 1 shown, according to an embodiment of the present application, the second negative Poisson's ratio structure 2 comprises: a bearing piece 21 and an arc-shaped piece 22; wherein, in the third damping direction, the bearing piece 21 is arranged in parallel with two; in the direction perpendicular to the third damping direction, the arc-shaped piece 22 is oppositely arranged with two, and the opening direction of the two arc-shaped pieces 22 is opposite. In the embodiment, along the third damping direction, the end of the arc-shaped piece 22 and the end of the bearing piece 21 are fixedly connected with each other.

[0060] Further, the arc-shaped piece 22 and the bearing piece 21 form an arc included angle β , and the arc-shaped piece 22 and the bearing piece 21 form an arc included angle β satisfying: 10° ≤β <90°.

[0061] Through the above setting, the negative Poisson's ratio effect of the second negative Poisson's ratio structure 2 is effectively ensured, if the included angle β is less than 10°, the value is too small, so that the negative Poisson's ratio effect of the second negative Poisson's ratio structure 2 is too weak to meet the use requirement, if the included angle β is greater than or equal to 90°, the value is too large, which is easy to cause the negative Poisson's ratio effect of the second negative Poisson's ratio structure 2 to lose, and it is difficult to play the corresponding use performance.

[0062] Further, the arc-shaped piece 22 and the bearing piece 21 are respectively plate-shaped pieces, and the thickness thereof is 0.5mm to 2mm.

[0063] Through the above setting, the overall quality is effectively ensured to be reasonable under the condition that the structural strength of the second negative Poisson's ratio structure 2 is effectively ensured, if the thickness is less than 1mm, the structural strength of the first negative Poisson's ratio structure 1 is too low, and it is difficult to play a stable and reliable supporting role, if the thickness is greater than 3mm, the mass of the second negative Poisson's ratio structure 2 is prone to be too heavy, especially in the case of being combined to constitute a larger super beam structure, the increase of the overall mass is more obvious.

[0064] As shown in Figure 1 According to an embodiment of the utility model, the second negative Poisson's ratio structure 2 is fixedly arranged with the upper end of the base body 4, specifically, in the third damping direction, the second connecting piece 121 at the lower end of the second negative Poisson's ratio structure 2 is fixed with the upper side of the base body 4. In the embodiment, the second connecting piece 121 at the end of the second negative Poisson's ratio structure 2 away from the base body 4 is arranged in the same plane with the first connecting piece 111 in the first damping part 11 at the upper end of the first negative Poisson's ratio structure 1, to ensure the stable installation of the upper end of the utility model and the separation of the vibration isolation position.

[0065] In the embodiment, the base body 4 is provided with a support block 41 at the end away from the second negative Poisson's ratio structure 2, and the end of the support block 41 away from the base body 4 is arranged in the same plane with the first connecting piece 111 of the first damping part 11 at the lower end of the first negative Poisson's ratio structure 1, to ensure the installation reliability of the lower end of the utility model and the rest of the structure, and also play a role in vibration conduction and isolation during vibration isolation.

[0066] As shown in Figure 1 According to an embodiment of the utility model, the local resonance structure 3 comprises: a vibrator 31, a rubber sleeve 32 arranged outside the vibrator 31; in the embodiment, the rubber sleeve 32 is wrapped outside the vibrator 31, further, the outside of the rubber sleeve 32 is embedded in the hollow part of the base body 4, to realize the separation of the base body 4 and the vibrator 31, and then the vibrator 31 can move freely in the vibration environment based on the buffering effect of the rubber sleeve 32. In the embodiment, in order to keep the reliability of the connection, the rubber sleeve 32 is connected between the vibrator 31 and the base body 4 by mechanical fixing, chemical bonding, hot melting welding, vulcanization process or thermosetting plasticity and the like.

[0067] In the embodiment, the ratio of the outer dimension of the rubber sleeve 32 to the outer dimension of the vibrator 31 is 2:1. The ratio is calculated according to the size and material of the vibrator 31 and the size and material of the rubber sleeve 32 to achieve the same or similar natural frequency as the whole bidirectional negative Poisson's ratio local resonance unit. By the above setting, the natural frequency of the local resonance structure 3 and the whole bidirectional negative Poisson's ratio local resonance unit are effectively ensured to be consistent or similar, which is beneficial to realize the resonance of the local resonance structure 3 and the whole unit, thereby achieving a good effect of absorbing and consuming vibration energy.

[0068] In the embodiment, the rubber sleeve 32 can be made of ethylene propylene rubber (EPDM) and the vibrator 31 can be made of copper.

[0069] In the embodiment, the vibrator 31 can be not only a column (such as a cylinder, an elliptic cylinder, a prism, etc.) but also a sphere (such as a round sphere, an elliptic sphere, etc.). Further, the covering area of the rubber sleeve 32 on the vibrator 31 is determined based on the size of the vibrator 31 and the shape of the hollow part of the base 4, and the vibrator 31 only needs to be separated from the base 4. Further, the hollow part of the base 4 can be adaptively set according to the shape of the vibrator 31. For example, when the vibrator 31 is an elliptic cylinder, the rubber sleeve 32 is also an elliptic sleeve covering the outer surface of the vibrator 31. Further, the hollow part of the base 4 can be set as an elliptic through hole, so that the vibrator 31 and the rubber sleeve 32 can be conveniently installed inside, and the thickness of the rubber sleeve 32 between the vibrator 31 and the base 4 is constant, thereby effectively ensuring that the vibrator 31 has constant vibration isolation performance in the circumferential direction. In the embodiment, the hollow part on the base 4 is arranged at the middle position of the base 4, and when the hollow part is a through hole, the through hole axis is in the horizontal direction and perpendicular to the first and second vibration reduction directions, thereby effectively ensuring that the vibrator 31 can also resonate in the first and second vibration reduction directions, and effectively realizing the vibration reduction effect of the utility model in the vertical plane direction.

[0070] As shown in Figure 1 , according to an embodiment of the utility model, the materials of the first negative Poisson's ratio structure 1, the second negative Poisson's ratio structure 2 and the base 4 are consistent, for example, being metal (such as aluminum alloy) or plastic.

[0071] In combination with Figure 1 , Figure 2 and Figure 3As shown, according to an embodiment of the utility model, the utility model provides a kind of super beam structure using the bidirectional negative poisson ratio local resonance cell of preceding, comprising: cell array A and the outer surrounding structure B surrounded in cell array A.Except in this embodiment, multiple bidirectional negative poisson ratio local resonance cells A1 are provided in cell array A.In this embodiment, bidirectional negative poisson ratio local resonance cell A1 includes: first negative poisson ratio structure 1, second negative poisson ratio structure 2, local resonance structure 3 and matrix 4;In this embodiment, matrix 4 is hollow block with multiple sides in circumferential direction;Wherein, first negative poisson ratio structure 1, second negative poisson ratio structure 2 and local resonance structure 3 are connected with matrix 4 respectively;Wherein, first negative poisson ratio structure 1 and second negative poisson ratio structure 2 are on the circumferentially adjacent two sides of matrix 4, and local resonance structure 3 is arranged in the hollow portion of matrix 4.In this embodiment, first negative poisson ratio structure 1 is bidirectional negative poisson ratio structure, wherein the first damping direction of first negative poisson ratio structure 1 is perpendicular to the second damping direction;First damping direction is parallel to the third damping direction of second negative poisson ratio structure 2.

[0072] Referring to Figure 2 And Figure 3 As shown, if bidirectional negative poisson ratio local resonance cell A1 is arranged along horizontal direction, then adjacent bidirectional negative poisson ratio local resonance cell A1 is connected based on first negative poisson ratio structure 1 and matrix 4 each other;Specifically, adjacent bidirectional negative poisson ratio local resonance cell A1 is fixed with the side of the matrix 4 of another bidirectional negative poisson ratio local resonance cell A1 based on the second connecting piece 121 of the end of first negative poisson ratio structure 1 away from matrix 4, wherein integrated molding can be used to realize fixed connection.In this embodiment, according to the mode that multiple bidirectional negative poisson ratio local resonance cells A1 are connected linearly in sequence, the construction of length strip-shaped super beam structure can be realized;Further, if the mode that multiple bidirectional negative poisson ratio local resonance cells A1 are connected linearly in multiple rows is arranged, then plate-shaped super beam structure can be realized.

[0073] In another embodiment, if the mode that multiple bidirectional negative poisson ratio local resonance cells A1 are connected in sequence along ring can realize the construction of ring-shaped super beam structure;Further, if the mode that multiple bidirectional negative poisson ratio local resonance cells A1 are connected along ring in radial direction is arranged, then ring-shaped plate-shaped super beam structure can be realized.

[0074] In the embodiment, if the bidirectional negative Poisson's ratio local resonance unit A1 is arranged along the vertical direction, the adjacent bidirectional negative Poisson's ratio local resonance units A1 are connected with each other based on the second negative Poisson's ratio structure 2 and the base 4, and the adjacent first negative Poisson's ratio structures 1 are connected with each other; further, in combination with the connection mode of the plurality of bidirectional negative Poisson's ratio local resonance units A1 in the horizontal direction, a three-dimensional block-shaped super-beam structure or a ring-shaped shell-shaped super-beam structure can be further realized.

[0075] In the embodiment, the outer surrounding structure B adopts a ring-shaped plate structure for surrounding the cell array A constituted inside, so as to facilitate the installation of the utility model; wherein the material of the outer surrounding structure B is consistent with the material of the first negative Poisson's ratio structure 1, the second negative Poisson's ratio structure 2 and the base 4.

[0076] In the embodiment, the outer surrounding structure B, the first negative Poisson's ratio structure 1, the second negative Poisson's ratio structure 2 and the base 4 can be integrally formed by 3D printing, so as to ensure the reliability of the overall structure.

[0077] The above is only an example of the specific scheme of the utility model, and for the devices and structures not described in detail, it should be understood that the general devices and general methods in the art are adopted to implement.

[0078] The above is only one scheme of the utility model and is not used to limit the utility model, and the utility model can have various changes and variations for the person skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A bidirectional negative Poisson's ratio local resonance cell, characterized in that: include: A first negative Poisson's ratio structure (1), a second negative Poisson's ratio structure (2), a local resonance structure (3) and a matrix (4); The base body (4) is a hollow block having multiple side surfaces in the circumferential direction; The first negative Poisson's ratio structure (1), the second negative Poisson's ratio structure (2), and the local resonance structure (3) are respectively connected to the base (4); wherein the first negative Poisson's ratio structure (1) and the second negative Poisson's ratio structure (2) are located on two circumferentially adjacent side surfaces of the base (4), and the local resonance structure (3) is arranged in the hollow portion of the base (4); The first negative Poisson's ratio structure (1) is a bidirectional negative Poisson's ratio structure, wherein a first vibration reduction direction of the first negative Poisson's ratio structure (1) is perpendicular to a second vibration reduction direction; The first vibration reduction direction is arranged in parallel with the third vibration reduction direction of the second negative Poisson's ratio structure (2).

2. The bidirectional negative Poisson's ratio local resonance cell according to claim 1, characterized in that: The first negative Poisson's ratio structure (1) is a closed annular structure, comprising: a first vibration reduction part (11) and a second vibration reduction part (12); The first vibration damping part (11) and the second vibration damping part (12) are distributed along a ring and are alternately connected in sequence; wherein, in the first vibration damping direction, two first vibration damping parts (11) are arranged opposite to each other, and in the second vibration damping direction, two second vibration damping parts (12) are arranged opposite to each other.

3. The bidirectional negative Poisson's ratio local resonance cell according to claim 2, characterized in that: The first vibration-damping part (11) comprises: a first connecting member (111) and a first inclined member (112); The first inclined members (112) are respectively provided at opposite ends of the first connecting member (111), wherein the ends of the first inclined members (112) and the ends of the first connecting member (111) are fixedly connected to each other, and the two first inclined members (112) are arranged obliquely in a direction approaching each other; The second vibration-damping part (12) comprises: a second connecting member (121) and a second inclined member (122); The second inclined members (122) are respectively provided at opposite ends of the second connecting member (121), wherein the ends of the second inclined members (122) are fixedly connected to the ends of the second connecting member (121), and the two second inclined members (122) are arranged obliquely in a direction approaching each other; Between the adjacent first vibration-damping part (11) and the second vibration-damping part (12), the end of the first inclined member (112) and the end of the second inclined member (122) are fixedly connected to each other, and the first inclined member (112) and the second inclined member (122) are arranged at an angle.

4. The bidirectional negative Poisson's ratio local resonance cell according to claim 3, characterized in that: Angle between the first inclined member (112) and the second inclined member (122) α Satisfaction: 10° ≤α <180°.

5. The bidirectional negative Poisson's ratio local resonance cell according to claim 4, characterized in that: The first connecting member (111), the first inclined member (112), the second connecting member (121) and the second inclined member (122) are respectively plate-shaped members, and their thickness is 1 mm to 3 mm.

6. The bidirectional negative Poisson's ratio local resonance cell according to claim 5, characterized in that: The second negative Poisson's ratio structure (2) comprises: a bearing member (21) and an arc-shaped member (22); In the third vibration reduction direction, two bearing members (21) are arranged parallel to each other; In a direction perpendicular to the third vibration reduction direction, two arc-shaped members (22) are arranged opposite to each other, and the openings of the two arc-shaped members (22) are oriented in opposite directions; Along the third vibration reduction direction, the end of the arc-shaped member (22) and the end of the supporting member (21) are fixedly connected to each other.

7. The bidirectional negative Poisson's ratio local resonance cell according to claim 6, characterized in that: The arc angle formed between the arc-shaped member (22) and the supporting member (21) β Satisfaction: 10° ≤β <90°.

8. The bidirectional negative Poisson's ratio local resonance cell according to claim 7, characterized in that: The arc-shaped member (22) and the supporting member (21) are respectively plate-shaped members, and their thickness is 0.5 mm to 2 mm.

9. The bidirectional negative Poisson's ratio local resonance cell according to claim 8, characterized in that: The local resonance structure (3) comprises: a vibrator (31), and a rubber sleeve (32) arranged outside the vibrator (31); The ratio of the outer dimensions of the rubber sleeve (32) to the outer dimensions of the vibrator (31) is 2:

1.

10. A super beam structure using the bidirectional negative Poisson's ratio local resonance cell according to any one of claims 1 to 9, characterized in that: include: A cell array (A) and an outer surrounding structure (B) surrounding the cell array (A); The cell array (A) is provided with a plurality of bidirectional negative Poisson's ratio local resonance cells (A1); The bidirectional negative Poisson's ratio local resonance cell (A1) comprises: a first negative Poisson's ratio structure (1), a second negative Poisson's ratio structure (2), a local resonance structure (3) and a matrix (4); The base body (4) is a hollow block having multiple side surfaces in the circumferential direction; The first negative Poisson's ratio structure (1), the second negative Poisson's ratio structure (2), and the local resonance structure (3) are respectively connected to the base (4); wherein the first negative Poisson's ratio structure (1) and the second negative Poisson's ratio structure (2) are located on two circumferentially adjacent side surfaces of the base (4), and the local resonance structure (3) is arranged in the hollow portion of the base (4); The first negative Poisson's ratio structure (1) is a bidirectional negative Poisson's ratio structure, wherein a first vibration reduction direction of the first negative Poisson's ratio structure (1) is perpendicular to a second vibration reduction direction; The first vibration reduction direction is arranged in parallel with the third vibration reduction direction of the second negative Poisson's ratio structure (2); If the bidirectional negative Poisson's ratio local resonance cells (A1) are arranged in the horizontal direction, adjacent bidirectional negative Poisson's ratio local resonance cells (A1) are connected to each other based on the first negative Poisson's ratio structure (1) and the matrix (4); if the bidirectional negative Poisson's ratio local resonance cells (A1) are arranged in the vertical direction, adjacent bidirectional negative Poisson's ratio local resonance cells (A1) are connected to each other based on the second negative Poisson's ratio structure (2) and the matrix (4), and the first negative Poisson's ratio structures (1) adjacent to each other are connected to each other.

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