Vibration absorbing unit and vibration absorbing device with three-dimensional negative poisson's ratio effect

Abstract

The present application relates to a kind of vibration-absorbing unit and vibration-absorbing device with three-dimensional negative poisson's ratio effect, and it relates to damping device technical field.The vibration-absorbing unit includes: metal frame, metal frame has three-dimensional negative poisson's ratio effect;Elastic member, it is located in metal frame, and elastic member is connected with the inner wall of metal frame;Load block, it is located in metal frame, and load block connects elastic member;Fixed part, connect elastic member and load block.The vibration-absorbing unit proposed in the present application overcomes the defect that traditional two-dimensional negative poisson's ratio honeycomb structure only presents negative poisson's ratio effect under single dimension, and it is suitable for multi-axis loading condition.At the same time, the combination of metal frame and its internal elastic member and load block can realize the effect of specified frequency point damping, can low-frequency vibration line spectrum prominent phenomenon, when external excitation frequency is close to the inherent frequency of vibrator system, the energy of elastic wave is absorbed greatly, so as to isolate the propagation of elastic wave in vibration-absorbing unit and vibration-absorbing device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vibration damping devices, in particular to a vibration absorbing unit with three-dimensional negative Poisson's ratio effect and a vibration absorbing device. BACKGROUND

[0002] Mechanical equipment noise and vibration transmission control is an important link that cannot be ignored in various industries, in order to attenuate the additional vibration hazards caused by mechanical equipment while performing functional work. Traditional vibration reduction methods mostly use elastic installation methods of equipment, whether single-layer, double-layer or floating raft, all belong to passive vibration isolation, and the effect of low-frequency vibration isolation is very limited. If the disturbance frequency band of the mechanical equipment is low, the stiffness of the vibration isolator needs to be designed to be very small, and it is difficult to have both vibration absorption effect and system stability. Double-layer and floating raft vibration isolation systems have good vibration reduction effect, but they must have a certain mass, usually requiring the ratio of intermediate mass to equipment mass to be greater than 0.5, and providing too much intermediate mass will inevitably bring resource and economic burden.

[0003] Analyzing the existing vibration reduction methods, to further improve the vibration reduction performance of the structure itself, such a structure first needs to have the ability to efficiently isolate or absorb external energy, and have a certain inhibitory effect on low-frequency vibration transmission; secondly, such a structure has the characteristics of lightweight, and has certain strength and stiffness, and can play a load bearing role.

[0004] Under the above constraints, the honeycomb structure with negative Poisson's ratio effect is an ideal design carrier. The honeycomb structure has porous characteristics, and can use its load bearing capacity for energy absorption. At the same time, through multi-scale mechanical design, the honeycomb structure can exhibit macro negative Poisson's ratio effect, which is different from the expansion of the transverse direction when the positive Poisson's ratio material is subjected to longitudinal compression. The negative Poisson's ratio material shrinks in the transverse direction after being subjected to longitudinal compression, which makes it have excellent energy absorption capacity. The structural form of the negative Poisson's ratio honeycomb makes it have great superiority and potential in resisting vibration impact load.

[0005] However, the traditional negative Poisson's ratio honeycomb structure is mostly in two-dimensional form, which only exhibits negative Poisson's ratio phenomenon in the plane, that is, it can only exhibit its special properties in a single dimension, but mechanical equipment is often in complex working conditions, and two-dimensional negative Poisson's ratio materials cannot have consistent performance in multiple directions, which cannot meet the multi-directional performance requirements of mechanical equipment in complex working conditions.

[0006] Therefore, how to propose a vibration reduction structure that can have both vibration absorption effect and system stability, and has consistent performance in multiple directions has become a technical problem to be solved at present. SUMMARY

[0007] Therefore, the present application aims to solve the problems of large intermediate mass, poor low-frequency vibration isolation effect in traditional passive vibration isolation, and the performance consistency of the vibration absorption structure in multiple directions cannot be met, and the vibration absorption structure cannot be applied to complex working environments.

[0008] Specifically, the present application is realized by the following technical solutions:

[0009] According to a first aspect of the present application, a vibration absorption unit with a three-dimensional negative Poisson's ratio effect is provided, comprising: a metal frame with a three-dimensional negative Poisson's ratio effect; an elastic member arranged in the metal frame and connected to the inner wall of the metal frame; a load block arranged in the metal frame and connected to the elastic member; and a fixing member connected to the elastic member and the load block.

[0010] Optionally, in some embodiments, the metal frame comprises: a top wall; a side wall connected to one end of the top wall; a bottom wall arranged opposite to the top wall and connected to the other end of the side wall; wherein the side wall is recessed towards the inside of the metal frame, the side wall is connected to the elastic member, and the elastic member can be clamped in the metal frame.

[0011] Optionally, in some embodiments, the top wall comprises two top wall plates arranged in cross, the bottom wall comprises two bottom wall plates arranged in cross, the two ends of the side wall are respectively connected to one end of the top wall plate and one end of the bottom wall plate, and the size of the bottom wall plate is the same as that of the top wall plate; the two ends of the side wall are inclined towards the inside of the metal frame along the height direction of the metal frame, and the height of the metal frame is represented as:

[0012]

[0013] wherein d represents the height of the metal frame, H represents the length of the top wall plate and / or the bottom wall plate, and θ represents the recess angle of the side wall.

[0014] Optionally, in some embodiments, the elastic member comprises two elastic strips arranged in cross, the end faces of the two elastic strips are recessed inward along the length direction of the elastic strips, the recess angle of the elastic strips is the same as the inclination angle of the side wall, and the length of the elastic member is represented as:

[0015]

[0016] wherein Y represents the length of the elastic strip, H represents the length of the top wall plate and / or the bottom wall plate, L represents the distance from one end of the side wall to the angle turning point, θ represents the recess angle of the elastic strip, and N represents the width of the elastic strip.

[0017] Optionally, in some embodiments, the load block is in the shape of a cylinder, a second through hole is arranged at the center of the load block, and the mass of the load block is represented as:

[0018] M = (1 / 2πR2 -1 / 2πr 2 )kρ;

[0019] Wherein, M represents the mass of the load block, π represents the circular constant, R represents the radius of the load block, r represents the radius of the second through hole, k represents the thickness of the load block, and p represents the material density of the load block.

[0020] Optionally, in some technical solutions, the center of the elastic member is provided with a first through hole, the center of the load block is provided with a second through hole, the fixing member includes a stud bolt and a fastening nut, the stud bolt is arranged in the first through hole and the second through hole, and the fastening nut can fix the load block on the elastic member.

[0021] Optionally, in some technical solutions, the vibration absorbing unit with the three-dimensional negative Poisson's ratio effect further comprises an adhesive layer arranged in the first through hole and connecting the elastic member and the stud bolt, wherein the adhesive layer can fix the stud bolt in the first through hole.

[0022] According to the second aspect of the present application, a vibration absorbing device with a three-dimensional negative Poisson's ratio effect is provided, which comprises the vibration absorbing unit with a three-dimensional negative Poisson's ratio effect according to the first aspect.

[0023] Optionally, in some technical solutions, the number of the vibration absorbing units includes a plurality of vibration absorbing units, the plurality of vibration absorbing units are arranged in an array along the x-axis, the y-axis and the z-axis directions respectively, and every two vibration absorbing units on the z-axis share a top wall or a bottom wall of a metal frame; wherein the array number n1 on the z-axis is the number of honeycomb layers, the array number on the x-axis is n2, the array number on the y-axis is n3, the number of vibration absorbing units in a single layer of honeycomb is n2*n3, and the number of vibration absorbing units in each layer of honeycomb is the same.

[0024] Optionally, in some technical solutions, the number of the vibration absorbing units includes a plurality of vibration absorbing units, and any one vibration absorbing unit shares a side wall of a metal frame with two adjacent vibration absorbing units.

[0025] The technical solutions provided by the present application at least bring the following beneficial effects:

[0026] The application provides a vibration absorbing unit and a vibration absorbing device with a three-dimensional negative Poisson's ratio effect, both of which are honeycomb structures and are composed of three-dimensional negative Poisson's ratio honeycomb cells, that is, metal frames, wherein the metal frames are provided with elastic members, load blocks and fixing members, the fixing members fix the load blocks on the elastic members, and the fixing members, the elastic members and the load blocks form a vibrator system. The vibration absorbing unit and the vibration absorbing device have excellent mechanical properties such as light weight, high specific modulus, high specific strength and high energy absorption, and overcome the defects of traditional two-dimensional negative Poisson's ratio honeycomb structures that only exhibit negative Poisson's ratio effect in a single dimension, so that the vibration absorbing unit and the vibration absorbing device have higher isotropy and are suitable for multi-axial loading. Meanwhile, the combination of the metal frame and the elastic members and the load blocks inside the metal frame can realize the effect of vibration reduction at a specified frequency point and can highlight the phenomenon of low-frequency vibration line spectrum, when the external excitation frequency is close to the natural frequency of the vibrator system, the energy of the elastic wave is greatly absorbed, so that the propagation of the elastic wave in the vibration absorbing unit and the vibration absorbing device is isolated. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the accompanying drawings needed to be used in the embodiments or the related description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0029] Figure 1 One of the structural schematic diagrams of the vibration absorbing unit with the three-dimensional negative Poisson's ratio effect provided by the embodiment of the application;

[0030] Figure 2 The second structural schematic diagram of the vibration absorbing unit with the three-dimensional negative Poisson's ratio effect provided by the embodiment of the application;

[0031] Figure 3 The third structural schematic diagram of the vibration absorbing unit with the three-dimensional negative Poisson's ratio effect provided by the embodiment of the application;

[0032] Figure 4 One of the structural schematic diagrams of the metal frame provided by the embodiment of the application;

[0033] Figure 5 The second structural schematic diagram of the metal frame provided by the embodiment of the application;

[0034] Figure 6 The third structural schematic diagram of the metal frame provided by the embodiment of the application;

[0035] Figure 7 A structural diagram of a metal frame according to an embodiment of the present application;

[0036] Figure 8 A structural diagram of a vibration unit according to an embodiment of the present application;

[0037] Figure 9 A structural diagram of a vibration unit according to an embodiment of the present application;

[0038] Figure 10 A structural diagram of a vibration unit according to an embodiment of the present application;

[0039] Figure 11 A structural diagram of a load block according to an embodiment of the present application;

[0040] Figure 12 A structural diagram of a vibration unit according to an embodiment of the present application;

[0041] Figure 13 A structural diagram of an elastic member according to an embodiment of the present application;

[0042] Figure 14 A structural diagram of a vibration-absorbing device with three-dimensional negative Poisson's ratio effect according to an embodiment of the present application;

[0043] Figure 15 A structural diagram of a vibration-absorbing device with three-dimensional negative Poisson's ratio effect according to an embodiment of the present application;

[0044] Figure 16 A structural diagram of a dynamic simplified model according to an embodiment of the present application.

[0045] Figures 1 to 16 The correspondence between the reference signs and the component names is as follows:

[0046] 1 vibration-absorbing unit, 11 metal frame, 111 top wall, 1111 top wall plate, 112 side wall, 113 bottom wall, 1131 bottom wall plate, 12 elastic member, 121 elastic strip, 122 first through hole, 13 load block, 131 second through hole, 14 fixing member, 141 stud bolt, 142 fastening nut, 15 adhesive layer, 16 weight, 17 damper, 18 spring, 2 vibration-absorbing device. DETAILED DESCRIPTION

[0047] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0048] According to a first aspect of the present application, a vibration absorbing unit 1 with three-dimensional negative Poisson's ratio effect is provided, as shown in Figure 1 、 Figure 2 and Figure 3 , the vibration absorbing unit 1 comprises: a metal frame 11 with three-dimensional negative Poisson's ratio effect; an elastic member 12 arranged in the metal frame 11 and connected with the inner wall of the metal frame 11; a load block 13 arranged in the metal frame 11 and connected with the elastic member 12; and a fixing member 14 connected with the elastic member 12 and the load block 13.

[0049] According to the vibration absorbing unit 1 with three-dimensional negative Poisson's ratio effect provided by the present application, it comprises a metal frame 11, an elastic member 12, a load block 13 and a fixing member 14. The metal frame 11 has three-dimensional negative Poisson's ratio effect, which is actually a three-dimensional negative Poisson's ratio honeycomb cell. The elastic member 12, the load block 13 and the fixing member 14 are arranged in the metal frame 11. The fixing member 14 fixes the load block 13 on the elastic member 12, so that the load block 13 and the elastic member 12 form a vibrator system, and the vibration absorbing unit 1 can absorb the vibration energy of the outside world when the outside world vibrates. The vibration absorbing unit 1 provided by the present application has excellent mechanical properties such as light weight, high specific modulus, high specific strength and high energy absorption, and overcomes the defect that the traditional two-dimensional negative Poisson's ratio honeycomb structure only presents negative Poisson's ratio effect in a single dimension, so that the vibration absorbing unit 1 has higher isotropy and is suitable for multi-axial loading. At the same time, the combination of the metal frame 11 and the elastic member 12 and the load block 13 inside the metal frame 11 can realize the effect of vibration reduction at a specified frequency point, and can avoid the phenomenon that the low-frequency vibration line spectrum is prominent. When the external excitation frequency is close to the natural frequency of the vibrator system, the energy of the elastic wave is greatly absorbed, so that the propagation of the elastic wave in the vibration absorbing unit 1 is isolated.

[0050] It can be understood that the meaning of "three-dimensional" in the three-dimensional negative Poisson's ratio effect is that the structure presents negative Poisson's ratio effect in three axial directions. That is, when any axial direction is subjected to tensile load or pressure load, the other two directions will expand outward or contract inward at the same time. For example, when subjected to vibration load, the vibration absorbing unit 1 with three-dimensional negative Poisson's ratio effect has better deformation efficiency and contraction performance due to the above deformation mechanism, and can absorb more energy of external load.

[0051] Optionally, the metal frame 11 is made of an alloy material to increase the carrying capacity and rigidity of the vibration absorption unit 1 as a whole. The elastic member 12 is made of a high-elastic polymer such as rubber, and the load block 13 is made of a heavy material such as iron, copper or lead. The load block 13 and the elastic member 12 form a vibrator system through the fixing member 14.

[0052] Optionally, in some embodiments, as shown in Figure 4 the metal frame 11 includes a top wall 111, a side wall 112 connected to the top wall 111 at one end, and a bottom wall 113 arranged opposite to the top wall 111 and connected to the other end of the side wall 112. The side wall 112 is recessed towards the inside of the metal frame 11, and the elastic member 12 is connected to the side wall 112 and can be clamped inside the metal frame 11.

[0053] In this embodiment, the metal frame 11 includes the top wall 111, the side wall 112 and the bottom wall 113. The top wall 111 and the bottom wall 113 are arranged opposite to each other and located on both sides of the side wall 112. In the height direction, the top wall 111 is located above the side wall 112, and the bottom wall 113 is located below the side wall 112. At the same time, the side wall 112 is recessed towards the inside of the metal frame 11, forming a metal frame 11 with a three-dimensional negative Poisson's ratio effect. By extending the two-dimensional recessed hexagonal structure in the orthogonal plane and constructing it in the form of a rod in three-dimensional space, the top wall 111, the side wall 112 and the bottom wall 113 of the metal frame 11 can be understood as a kind of rod. The number of side walls 112 is four, and the four side walls 112, the top wall 111 and the bottom wall 113 form a metal frame 11 with hollow. The elastic member 12 is embedded in the metal frame 11, and the shape of the connection between the elastic member 12 and the side wall 112 is the same as the recessed shape of the side wall 112, so that the elastic member 12 is clamped inside the metal frame 11, to improve the connection stability of the elastic member 12 and the metal frame 11. At the same time, the elastic member 12 and the load block 13 embedded in the metal frame 11 are matched and fixed with the side wall 112 of the metal frame 11, and when the vibration absorption unit 1 is subjected to extrusion, a certain supporting effect is provided.

[0054] In addition, the connection between the elastic member 12 and the side wall 112 is fixed by an adhesive, further improving the connection reliability of the elastic member 12 and the metal frame 11.

[0055] Optionally, in some embodiments, as shown in Figure 5 , Figure 6 and Figure 7As shown, the top wall 111 includes two top wall plates 1111 arranged in cross, the bottom wall 113 includes two bottom wall plates 1131 arranged in cross, the two ends of the side wall 112 are connected to one end of the top wall plate 1111 and one end of the bottom wall plate 1131 respectively, and the size of the bottom wall plate 1131 is the same as that of the top wall plate 1111; the two ends of the side wall 112 are inclined towards the inside of the metal frame 11 along the height direction of the metal frame 11, and the height of the metal frame 11 is represented as:

[0056]

[0057] wherein d represents the height of the metal frame 11, H represents the length of the top wall plate 1111 and / or the bottom wall plate 1131, and θ represents the inner recess angle of the side wall 112.

[0058] In this embodiment, the top wall 111 and the bottom wall 113 have the same structure and size, the top wall 111 includes two top wall plates 1111 arranged in cross, the bottom wall 113 includes two bottom wall plates 1131 arranged in cross, the top wall 111 and the bottom wall 113 are both in cross shape, and the arrangement direction of the top wall plate 1111 is the same as that of the bottom wall plate 1131. Meanwhile, the two ends of the side wall 112 are connected to one end of the top wall plate 1111 and one end of the bottom wall plate 1131 respectively, the two ends of the side wall 112 are gradually inclined towards the center direction of the side wall 112, and are inclined towards the inside of the metal frame 11, forming an inner recess shaped side wall 112, the inner recess angle, the height of the metal frame 11 and the length of the top wall plate 1111 or the bottom wall plate 1131 satisfy the above relationship, that is, this embodiment limits the design parameters of the metal frame 11, so that the metal frame 11 has a three-dimensional negative Poisson's ratio effect, the vibration absorbing unit 1 has higher isotropy, is suitable for multi-axis loading, and makes up for the defect that the two-dimensional negative Poisson's ratio honeycomb structure can only present negative Poisson's ratio effect in a single dimension.

[0059] Optionally, in some embodiments, as shown in Figure 8 , Figure 9 and Figure 10 , the elastic member 12 includes two elastic strips 121 arranged in cross, the end faces of the two elastic strips 121 are both recessed inward along the length direction of the elastic strip 121, the recess angle of the elastic strip 121 is the same as the inclination angle of the side wall 112, and the length of the elastic member 12 is represented as:

[0060]

[0061] wherein Y represents the length of the elastic strip 121, H represents the length of the top wall plate 1111 and / or the bottom wall plate 1131, L represents the distance from one end of the side wall 112 to the angle turning point, θ represents the inner recess angle of the elastic strip 121, and N represents the width of the elastic strip 121.

[0062] In this embodiment, the elastic member 12 includes two elastic strips 121 arranged in cross, the end faces of the two elastic strips 121 are inwardly recessed along the length direction of the elastic strips 121, and the recessed angle of the elastic strips 121 is the same as the inclined angle of the side wall 112. The length of the elastic strip 121, the length of the wall flat plate or the bottom wall flat plate 1131, the distance from one end of the side wall 112 to the angle turning point, the inwardly recessed angle of the elastic strip 121, and the width of the elastic strip 121 satisfy the above relationship, that is, this embodiment limits the design parameters of the elastic member 12, so that the internal space of the elastic member 12 and the metal frame 11 can be adaptively matched, thereby improving the connection stability of the elastic member 12 and the metal frame 11.

[0063] Optionally, in some embodiments, as shown in Figure 10 and Figure 11 , the load block 13 is in the shape of a cylinder, the second through hole 131 is arranged at the center of the load block 13, and the mass of the load block 13 is represented as:

[0064] M = (1 / 2πR 2 -1 / 2πr 2 )kρ;

[0065] wherein M represents the mass of the load block 13, π represents the circular constant, R represents the radius of the load block 13, r represents the radius of the second through hole 131, k represents the thickness of the load block 13, and ρ represents the material density of the load block 13.

[0066] In this embodiment, the load block 13 is in the shape of a cylinder, the second through hole 131 is arranged at the center of the load block 13, and the number of the load block 13 includes two, which are arranged on the upper and lower sides of the elastic member 12, respectively, and the load block 13 is further fixed on the elastic member 12 by the fixing member 14, so that the load block 13 and the elastic member 12 form a vibrator system, thereby reducing the vibration caused by external interference, improving the service life of the mechanical equipment, and also absorbing sound wave energy, thereby reducing the noise generated by the mechanical equipment. The mass of the load block 13, the radius of the load block 13, the radius of the second through hole 131, the thickness of the load block 13, and the material density of the load block 13 satisfy the above relationship, that is, this embodiment limits the design parameters of the load block 13, so that the vibrator system formed by the load block 13 and the elastic member 12 can eliminate low-frequency vibration and greatly absorb elastic wave, and isolate the elastic wave outside the vibration absorption unit 1.

[0067] Optionally, in some embodiments, as shown in Figure 12As shown, the elastic member 12 is provided with a first through hole 122 at the center thereof, the load block 13 is provided with a second through hole 131 at the center thereof, the fixing member 14 includes a stud bolt 141 and a fastening nut 142, the stud bolt 141 is arranged in the first through hole 122 and the second through hole 131, and the fastening nut 142 can fix the load block 13 on the elastic member 12.

[0068] In this embodiment, the elastic member 12 is provided with a first through hole 122 at the center thereof, the load block 13 is provided with a second through hole 131 at the center thereof, the fixing member 14 includes a stud bolt 141 and a fastening nut 142, the number of the load block 13 includes at least one, and the length of the stud bolt 141 is greater than the thickness of the elastic member 12. When the load block 13 is installed, the stud bolt 141 can be inserted through the first through hole 122, then the second through hole 131 of the load block 13 is inserted onto the protruding stud bolt 141, and the two ends of the stud bolt 141 are tightened by the fastening nut 142 to complete the fixation of the load block 13. Of course, the number of the load block 13 can also include multiple, which can be arranged at one end of the elastic member 12 or at both upper and lower ends of the elastic member 12, and the load block 13 is further fixed on the elastic member 12 by the stud bolt 141 and the fastening nut 142, so that the elastic member 12 and the load block 13 form a vibrator system to absorb vibration energy and improve the service life of the mechanical equipment, while absorbing the noise generated by the mechanical equipment.

[0069] Optionally, in some embodiments, as shown in Figure 12 and Figure 13 As shown, the vibration absorbing unit 1 with three-dimensional negative Poisson's ratio effect further includes an adhesive layer 15 arranged in the first through hole 122 and connecting the elastic member 12 and the stud bolt 141, wherein the adhesive layer 15 can fix the stud bolt 141 in the first through hole 122.

[0070] In this embodiment, the vibration absorbing unit 1 further includes the adhesive layer 15 arranged in the first through hole 122, one side of the adhesive layer 15 is connected to the elastic member 12, and the other side of the adhesive layer 15 is connected to the stud bolt 141, so that the stud bolt 141 and the elastic member 12 are fixed to each other, avoiding the failure of the fixing member 14 caused by irregular vibration energy, and further improving the installation stability of the load block 13.

[0071] According to the second aspect of the present application, a vibration absorbing device 2 with three-dimensional negative Poisson's ratio effect is provided, which includes the vibration absorbing unit 1 with three-dimensional negative Poisson's ratio effect as proposed in the first aspect.

[0072] According to the present application, the vibration absorbing device 2 with three-dimensional negative Poisson's ratio effect comprises the vibration absorbing unit 1 with three-dimensional negative Poisson's ratio effect as described in the first aspect, and thus the vibration absorbing device 2 with three-dimensional negative Poisson's ratio effect has all the advantages of the vibration absorbing unit 1 with three-dimensional negative Poisson's ratio effect as described in the first aspect, which will not be repeated here.

[0073] Optionally, in some embodiments, as shown in Figure 14 The number of the vibration absorbing units 1 comprises a plurality of vibration absorbing units 1, and the plurality of vibration absorbing units 1 are arranged along the x-axis, y-axis and z-axis directions respectively, and every two vibration absorbing units 1 on the z-axis share a top wall 111 or a bottom wall 113 of the metal frame 11; wherein the array number n1 on the z-axis is the number of the honeycomb layers, the array number n2 on the x-axis is the number of the honeycomb layers in the x-axis direction, and the array number n3 on the y-axis is the number of the honeycomb layers in the y-axis direction, the number of the vibration absorbing units 1 in a single honeycomb layer is n2*n3, and the number of the vibration absorbing units 1 in each honeycomb layer is the same.

[0074] In this embodiment, the number of the vibration absorbing units 1 comprises a plurality of vibration absorbing units 1, and the vibration absorbing unit 1 is the smallest basic unit of the vibration absorbing device 2. Specifically, in the three-dimensional coordinate system, the plurality of vibration absorbing units 1 are arranged along the x-axis, y-axis and z-axis directions respectively, and every two vibration absorbing units 1 on the z-axis share a top wall 111 or a bottom wall 113 of the metal frame 11. That is, the vibration absorbing device 2 composed of a plurality of vibration absorbing units 1 shares a top wall 111 or a bottom wall 113 of the metal frame 11 for every two vibration absorbing units 1 on the z-axis. This arrangement mode makes there be a gap between adjacent vibration absorbing units 1, has the advantage of lightweight, provides more contact surfaces in a smaller space, and thus increases the vibration energy absorption capacity. Moreover, the number of the vibration absorbing units 1 in each honeycomb layer is the same, so that the overall vibration absorbing effect of the vibration absorbing device 2 is more balanced.

[0075] Optionally, in some embodiments, as shown in Figure 15 The number of the vibration absorbing units 1 comprises a plurality of vibration absorbing units 1, and any one vibration absorbing unit 1 shares a side wall 112 of the metal frame 11 with two adjacent vibration absorbing units 1.

[0076] In this embodiment, the number of the vibration absorbing units 1 comprises a plurality of vibration absorbing units 1, and the vibration absorbing unit 1 is the smallest basic unit of the vibration absorbing device 2. In the three-dimensional coordinate system, any one vibration absorbing unit 1 shares a side wall 112 of the metal frame 11 with two adjacent vibration absorbing units 1, so as to avoid the existence of a gap between the vibration absorbing units 1 and the vibration absorbing units 1. In the case of the same number of vibration absorbing units 1, this arrangement mode can make the volume of the vibration absorbing device 2 smaller and the space utilization higher, and thus improve the vibration energy absorption capacity of the vibration device per unit volume.

[0077] In one specific application, the present application provides a honeycomb dynamic vibration absorbing structure with three-dimensional negative Poisson's ratio effect, as shown in Figure 1The minimum vibration absorption structure unit (vibration absorption unit 1) provided in the application is shown, which is composed of a three-dimensional negative Poisson's ratio honeycomb core (metal frame 11), an elastic element 12 embedded in the honeycomb basic cell, a load block 13, a fastening nut 142, and a double-headed threaded bolt 141.

[0078] As shown in Figure 3 and Figure 12 , the outer frame of the minimum vibration absorption structure unit is a three-dimensional negative Poisson's ratio cell structure, the elastic element 12 is embedded in the cell structure by slot matching, and an adhesive layer is provided between the two, which are fixed to each other by a specific adhesive. The load block 13 is fixed on the elastic element 12 by the double-headed threaded bolt 141 and the fastening nut 142, and the specific implementation is as follows: the elastic element 12 has a cylindrical opening (first through hole 122) in the center, and the double-headed threaded bolt 141 passes through it; an adhesive layer 15 is provided between the elastic element 12 opening and the bolt, and the two are kept fixed to each other; the load block 13 is sleeved on the bolt through the center opening, and is fastened with the elastic element 12 by the nut.

[0079] One of the core components of the honeycomb dynamic vibration absorption structure with three-dimensional negative Poisson's ratio effect proposed by the application is a three-dimensional negative Poisson's ratio honeycomb cell (metal frame 11), and the special deformation mechanism of the cell can exhibit negative Poisson's ratio effect in multiple axial directions under load. Specifically, by expanding the two-dimensional concave hexagonal structure in the orthogonal plane, a three-dimensional negative Poisson's ratio cell is constructed in three-dimensional space in the form of a rod, Figure 4 Design diagram of three-dimensional negative Poisson's ratio cell structure.

[0080] As shown in Figure 5 , Figure 6 and Figure 7 , let the height of the three-dimensional negative Poisson's ratio honeycomb cell be d, and set the cross sections of all the rods in the cell to be the same size rectangle, and let the side lengths of the cross section rectangle of the rod in the cell be t1 and t2. During the periodic array process, the cell rod will be shared with the adjacent cell, and the sharing mode of the cell needs to be analyzed under different array and connection modes. The cross sections of the horizontal rod and the concave rod can be described as rectangles with side lengths t1 and t2, respectively, the length of the horizontal rod (top wall 111 or bottom wall 113) is H, the length of the concave rod (side wall 112) is L, and the structure concave angle is θ. The relationship between the height of the three-dimensional negative Poisson's ratio honeycomb cell and the length of the concave rod can be expressed as:

[0081]

[0082] Theoretical analysis shows that the mechanical properties of the three-dimensional negative Poisson's ratio honeycomb of the frame of the dynamic vibration absorption structure can be determined by selecting appropriate design geometric parameters. On the micro level, the geometric shape of the cell, the thickness t1 and t2 of the rod, the length H of the rod in the horizontal direction, the length L of the rod in the concave direction and the structure concave angle θ are adjusted; on the macro level, the number of layers of the three-dimensional negative Poisson's ratio honeycomb and the number of cells contained between the layers are adjusted.

[0083] One of the core components of the honeycomb dynamic vibration absorption structure with three-dimensional negative Poisson's ratio effect proposed in the application is a vibrator system. Figure 8 、 Figure 9 、 Figure 10 and Figure 12 The load block 13 is fixed with the elastic element 12 by bolts, nuts and elastic elements 12 to form a vibrator system. According to the working principle of the dynamic vibration absorber: the stiffness of the elastic element 12 and the weight of the load block 13 directly affect the working frequency band of the dynamic vibration absorber. The stiffness of the elastic element 12 is associated with the cross-sectional modulus of the base material, and the weight of the load block 13 is also associated with the base material and size for making it.

[0084] As shown in Figure 7 and Figure 9 , the elastic element 12 is a cross structure, and the intersecting rectangle is denoted as Y, the width is N, the height is O, and the angle of the slot is equal to the angle of the cell concave angle θ. The elastic element 12 and the cell gap size are perfectly matched, and the following relationship exists between them:

[0085]

[0086] As shown in Figure 7 、 Figure 9 、 Figure 10 and Figure 11 , the mass of a single load block 13 is denoted as M, the geometric size of the load block 13 is denoted as R, the thickness is denoted as k, the density of the base material is denoted as ρ, and the size of the load block 13 center hole (the size of the second through hole 131) is denoted as r. The mass M and the geometric size of the load block 13 have the following relationship:

[0087] M=(1 / 2πR 2 -1 / 2πr 2 )kρ;

[0088] The dynamic vibration absorption structure formed by the three-dimensional negative Poisson's ratio cell as the frame structure proposed in the application has the following vibration reduction principle: the principle of simulating the dynamic vibration absorber by the rigid frame and the vibrator, when the external load propagates in the application, the elastic wave is localized by the minimum dynamic vibration absorption unit, the local resonance mode is excited, and the dynamic simplified model is as shown in Figure 16As shown in the figure, the power simplified model includes the weight 16, the damper 17 and the spring 18, the damper 17 and the spring 18 support the weight 16 together, the external excitation load is defined as F, G represents the reaction force of the oscillator system, x represents the displacement of the load block 13, when the excitation main peak frequency is consistent with the inherent frequency of the oscillator system, the inherent mode of the oscillator system is excited, due to the influence of the phase difference, the reaction force G of the oscillator system and the external load F can theoretically offset each other, so that the elastic wave is localized and cannot be transmitted outward, thereby achieving the purpose of attenuating low-frequency vibration energy.

[0089] The dynamic vibration absorption structure with the three-dimensional negative Poisson's ratio cell as a framework can form a three-dimensional honeycomb structure through different arrays and connection modes.

[0090] As shown in the figure, Figure 14 The minimum vibration absorption unit is arrayed along the x-axis, the y-axis and the z-axis, respectively, and every two minimum vibration absorption units on the z-axis share a horizontal rod of the three-dimensional negative Poisson's ratio cell.

[0091] As shown in the figure, Figure 15 The inner recess angle of the external frame of the minimum vibration absorption unit is θ, and the outer corner is θ / 2, when arrayed, the inner recess angle of the reference unit can match the outer corner of the two minimum units, and the inclined rod in each inner recess direction is shared by the adjacent cell, and so on, arrayed and filled in space.

[0092] The present application provides a honeycomb dynamic vibration absorption structure with a three-dimensional negative Poisson's ratio effect, wherein the design of the three-dimensional negative Poisson's ratio honeycomb structure overcomes the defect that the traditional two-dimensional negative Poisson's ratio structure cannot simultaneously exhibit a negative Poisson's ratio effect in multiple directions when subjected to multi-axial load, increases the stiffness of the structure when subjected to dynamic load such as vibration impact, and improves the energy absorption capacity of the overall honeycomb structure.

[0093] The elastic member 12 and the load block 13 embedded in the three-dimensional negative Poisson's ratio cell constitute an oscillator system, and the three-dimensional negative Poisson's ratio cell is used as a framework to form a dynamic vibration absorption structure.

[0094] In summary, the three-dimensional negative Poisson's ratio honeycomb cell and the dynamic vibration absorber two concepts are combined, effectively integrating the unique mechanical advantages of each, making it in the design of vibration isolation structure with light weight, high efficiency energy absorption and elimination of low frequency line spectrum characteristics. At the same time, the application has better parameter designability and better adaptability in different working environments.

[0095] It should be noted that, in this paper, such as "first" and "second" and other relational terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term "include", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0096] The above is only a specific embodiment of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A vibration absorbing unit (1) having a three-dimensional negative Poisson's ratio effect, characterized by, The application relates to a metal frame (11) with a three-dimensional negative Poisson's ratio effect. An elastic member (12) is arranged in the metal frame (11) and connected to the inner wall of the metal frame (11). A load block (13) is arranged in the metal frame (11) and connected to the elastic member (12). A fixing member (14) is connected to the elastic member (12) and the load block (13). The metal frame (11) comprises: a top wall (111); a side wall (112) connected to one end of the top wall (111); a bottom wall (113) arranged opposite to the top wall (111) and connected to the other end of the side wall (112); wherein the side wall (112) is recessed towards the inside of the metal frame (11), the side wall (112) is connected to the elastic member (12), and the elastic member (12) can be clamped in the metal frame (11); the top wall (111) comprises two top wall plates (1111) arranged in cross, the bottom wall (113) comprises two bottom wall plates (1131) arranged in cross, the two ends of the side wall (112) are connected to one end of the top wall plate (1111) and one end of the bottom wall plate (1131) respectively, and the size of the bottom wall plate (1131) is the same as that of the top wall plate (1111); the two ends of the side wall (112) are inclined towards the inside of the metal frame (11) along the height direction of the metal frame (11), and the height of the metal frame (11) is represented as: wherein d represents the height of the metal frame (11), H represents the length of the top wall plate (1111) and / or the bottom wall plate (1131), and theta represents the recess angle of the side wall (112); the elastic member (12) comprises two elastic strips (121) arranged in cross, the end faces of the two elastic strips (121) are recessed inwards along the length direction of the elastic strips (121), the recess angle of the elastic strips (121) is the same as the inclination angle of the side wall (112), and the length of the elastic member (12) is represented as: wherein Y represents the length of the elastic strip (121), H represents the length of the top wall plate (1111) and / or the bottom wall plate (1131), L represents the distance from one end of the side wall (112) to an angle turning point, theta represents the recess angle of the elastic strip (121), and N represents the width of the elastic strip (121). The load block (13) is in the shape of a cylinder, a second through hole (131) is arranged at the center of the load block (13), and the mass of the load block (13) is represented as:

2. The vibration-absorbing unit (1) with a three-dimensional negative Poisson's ratio effect according to claim 1, characterized in that wherein M represents the mass of the load block (13), pi represents a circular constant, R represents the radius of the load block (13), r represents the radius of the second through hole (131), k represents the thickness of the load block (13), and p represents the material density of the load block (13). M = (1 / 2πR 2 -1 / 2πr 2 )kρ; ​ 3. The vibration absorbing unit (1) with a three-dimensional negative Poisson's ratio effect according to any one of claims 1 to 2, characterized in that The center of the elastic piece (12) is provided with a first through hole (122), the center of the load block (13) is provided with a second through hole (131), the fixing piece (14) includes a stud bolt (141) and a fastening nut (142), the stud bolt (141) is arranged in the first through hole (122) and the second through hole (131), and the fastening nut (142) can fix the load block (13) on the elastic piece (12).

4. The vibration-absorbing unit (1) with a three-dimensional negative Poisson's ratio effect according to claim 3, characterized in that Also comprising: An adhesive layer (15) is arranged in the first through hole (122) and connects the elastic piece (12) and the stud bolt (141); The adhesive layer (15) can fix the stud bolt (141) in the first through hole (122).

5. A vibration absorbing device (2) having a three-dimensional negative Poisson's ratio effect, characterized by The vibration absorbing unit (1) with three-dimensional negative Poisson's ratio effect comprises the vibration absorbing unit (1) according to any one of claims 1 to 4.

6. The vibration absorbing device (2) with three-dimensional negative Poisson's ratio effect according to claim 5, characterized in that The number of the vibration absorbing units (1) comprises a plurality of vibration absorbing units (1), and the plurality of vibration absorbing units (1) are arranged in an array along the x-axis, the y-axis and the z-axis direction respectively, and each two of the vibration absorbing units (1) on the z-axis share a top wall (111) or a bottom wall (113) of the metal frame (11). Wherein, the array number n1 on the z-axis is the number of honeycomb layers, the array number on the x-axis is n2, the array number on the y-axis is n3, the number of the vibration absorbing units (1) in a single layer of honeycomb is n2*n3, and the number of the vibration absorbing units (1) in each layer of honeycomb is the same.

7. The vibration absorbing device (2) with three-dimensional negative Poisson's ratio effect according to claim 5, characterized in that, The number of the vibration absorbing units (1) comprises a plurality of vibration absorbing units (1), and any one of the vibration absorbing units (1) and the adjacent two vibration absorbing units (1) share a side wall (112) of the metal frame (11).

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