A multi-directional local resonance module and its vibration-damping metamaterial tubular structure

Abstract

This invention discloses a multi-directional local resonance module and its vibration-damping and isolation metamaterial tubular structure. The multi-directional local resonance module includes a matrix, a multi-directional local resonator, and a bushing ring. The multi-directional local resonator includes a triaxially adjustable elastic structure and a mass. The vibration-damping and isolation metamaterial tubular structure is composed of several multi-directional local resonance modules. The triaxially adjustable elastic structure is circumferentially distributed around the cylindrical mass and connects the mass to the bushing ring. The multi-directional local resonance modules are installed on beam or tubular matrix structures at predetermined positions via the bushing ring. This invention, through parameter design and combination design of the multi-directional local resonance modules, can achieve low-frequency, broadband, and efficient suppression of longitudinal and bending wave propagation in beam or tubular structures based on multi-directional local resonance modules, giving them strong multi-dimensional low-frequency vibration reduction and isolation capabilities in the target frequency band, and is easy to install and process.

Description

Technical Field

[0001] This invention belongs to the field of new materials and structures for vibration reduction and noise reduction. Specifically, it relates to a multi-directional local resonance module and its vibration reduction and isolation metamaterial tubular structure, which can be applied to modern transportation vehicles (ships, airplanes, high-speed trains, new energy vehicles), functional buildings (bridges, subway waiting halls, tunnels), etc. Background Technology

[0002] Vibration is a common phenomenon in production and daily life, especially prevalent in the machinery industry and other industrial sectors. Various vibration problems not only affect the performance of precision instruments and equipment but also cause structural noise, damage structural strength, worsen working conditions for operators, and in severe cases, lead to mechanical failures and reduce the service life of mechanical structures. In engineering practice, traditional vibration reduction and isolation technologies have many limitations and can no longer meet the increasingly diverse needs for vibration reduction and isolation. In recent years, research on metamaterials based on local resonance has shown that these materials can be used to control the propagation of elastic waves, and have broad application prospects in novel acoustic devices and vibration reduction and noise reduction.

[0003] In many cases, vibration is multidimensional, including not only bending vibration but also longitudinal vibration. Multidimensional vibration can adversely affect personnel or equipment in many situations, causing various types of damage. For example, multidimensional vibration of a robotic arm can affect the accuracy of its motion trajectory, and multidimensional vibration of a machine tool can affect the machining accuracy of parts. Hollow beam or tubular structures are very common in engineering projects such as buildings, bridges, and machinery. However, their multidimensional vibration reduction and isolation often rely on combinations of traditional components such as springs and rubber, which suffers from problems such as complex structural design, narrow low-frequency bandwidth, and high cost.

[0004] In recent years, metamaterial structures, proposed and developed in the fields of acoustic physics and condensed matter physics, have provided new ideas for solving vibration problems of common structures in engineering. Metamaterial structures refer to novel composite structures composed of specially designed artificial microstructure units (such as local resonant units, or simply oscillators) attached to a matrix structure in a certain way. They can obtain extraordinary physical properties (such as negative equivalent mass density, negative equivalent modulus, etc.) that traditional materials / structures do not possess, and can achieve extraordinary control over mid- and low-frequency elastic waves, making them of broad application value in the field of mid- and low-frequency vibration reduction and noise reduction. Summary of the Invention

[0005] Based on the concept of metamaterial structures and the shortcomings of traditional hollow beam or tubular structures in vibration reduction and isolation, this invention provides a multi-directional local resonance module and its vibration-reducing and isolation metamaterial tubular structure. The three-dimensional highly adjustable elastic structure and mass body in the multi-directional local resonance module can be equivalent to a spring-mass oscillator, with the bushing ring serving a connecting and fixing function. By designing the module parameters according to different vibration reduction and isolation targets, multi-dimensional vibration reduction and isolation can be achieved. Furthermore, the combination and arrangement of multi-directional local resonance modules can achieve low-frequency, broadband, and efficient vibration reduction and isolation, providing a new approach for achieving multi-dimensional vibration isolation in beam or tubular structures based on the local resonance effect.

[0006] To achieve the above objectives, the present invention provides a multi-directional local resonance module, comprising a substrate, a multi-directional local resonator, and a bushing ring. The multi-directional local resonator comprises a mass and a triaxial stiffness highly adjustable elastic structure. The multi-directional local resonator is fixed to the substrate by means of embedding or sleeve.

[0007] When the multi-directional local resonator is fixed to the substrate by embedding:

[0008] The matrix is ​​a hollow beam or tubular structure, and the mass body is a columnar structure;

[0009] One end of the triaxial stiffness high adjustable elastic structure is connected to the outer wall of the mass body, the bushing ring is spaced on the mass body, and the inner ring wall of the bushing ring is connected to the other end of the triaxial stiffness high adjustable elastic structure. The outer ring wall of the bushing ring is fixedly connected to the inner wall of the substrate.

[0010] When the multi-directional local resonator is fixed to the substrate in the form of an outer jacket:

[0011] The matrix has a columnar structure, and the mass body has a hollow columnar structure;

[0012] One end of the triaxial stiffness high adjustable elastic structure is connected to the inner wall of the mass body, the mass body is spaced out on the bushing ring, and the outer ring wall of the bushing ring is connected to the other end of the triaxial stiffness high adjustable elastic structure, and the inner ring wall of the bushing ring is fixedly connected to the outer wall of the substrate.

[0013] In one embodiment, the triaxial stiffness highly adjustable elastic structure includes a plurality of columnar triaxial stiffness highly adjustable elastic bodies, one end of each of the triaxial stiffness highly adjustable elastic bodies being distributed circumferentially along the outer or inner wall of the mass body.

[0014] One end of each of the three-dimensional stiffness adjustable elastomers is connected to the inner or outer ring wall of the same bushing ring.

[0015] In one embodiment, the cross-sectional shape of the tri-directional high-adjustability elastomer is circular, circular ring-shaped, square, rectangular or polygonal. Furthermore, the equivalent stiffness of the tri-directional high-adjustability elastic structure vibrating in different degrees of freedom can be changed by designing different cross-sectional shape parameters.

[0016] In one embodiment, the angle between the length direction of the tri-directional high-adjustability elastomer and the axis of the mass body is A, where 0° < A ≤ 90°. Furthermore, the equivalent stiffness of its vibration in different degrees of freedom can be changed by adjusting the magnitude of A.

[0017] In one embodiment, the tri-directional high-adjustability elastomer is a columnar structure with local hollowing and / or a columnar structure with variable cross-section and / or a bent columnar structure.

[0018] In one embodiment, the tri-directional high-adjustability elastic structure is an annular structure sleeved on the outer wall of the mass body, or the tri-directional high-adjustability elastic structure is an annular structure embedded in the inner wall of the mass body.

[0019] In one embodiment, the number of the tri-directional high-adjustability elastic structures is multiple, and each of the tri-directional high-adjustability elastic structures is distributed at intervals along the axis of the mass body on the mass body;

[0020] The bushing rings correspond to the tri-directional high-adjustability elastic structures one by one, and the bushing rings are connected between the base body and the corresponding tri-directional high-adjustability elastic structures.

[0021] In one embodiment, an interference fit exists between the bushing ring and the base body.

[0022] In one embodiment, the bushing ring and the base body are fixedly connected by a pin shaft.

[0023] In one embodiment, the material parameters of the base body, the tri-directional high-adjustability elastic structure, the mass body and the bushing ring are the same or different.

[0024] To achieve the above object, the present invention further provides a vibration isolation and reduction metamaterial tubular structure, including two or more multi-directional local resonance modules. Each of the multi-directional local resonance modules is arranged in a predetermined manner. Different arrangement manners will produce different band gap effects, and a broadband vibration isolation and reduction effect can be generated through design in a target frequency band.

[0025] In one embodiment, the parameters of the matrix and the multi-directional local resonant body in each of the multi-directional local resonant modules may be the same or different. By designing the parameters of the columnar mass element and the triaxial highly adjustable elastic body, their equivalent spring-mass oscillators can have different local resonant frequencies, thereby producing different local resonant effects; by changing the matrix parameters, different vibration reduction and isolation effects can be achieved.

[0026] This invention provides a multi-directional local resonance module and its vibration-damping and isolation metamaterial tubular structure. Through parameter design and combined design of the multi-directional local resonance module, it can achieve low-frequency, broadband, and efficient multi-dimensional vibration reduction and isolation. It can also effectively suppress the propagation of longitudinal waves and bending waves in beam or tubular structures based on the multi-directional local resonance module, giving it strong multi-dimensional low-frequency vibration reduction and isolation capabilities in the target frequency band. This provides a new approach to multi-dimensional vibration isolation of beam or tubular structures, is easy to install, and has a simple structure, overcoming the problems of complex structural design, narrow low-frequency bandwidth, and high cost in traditional beam or tubular structures for multi-dimensional vibration reduction and isolation. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 This is an isometric view of the multi-directional local resonance module in Example 1;

[0029] Figure 2 This is a cross-sectional view of the multi-directional local resonance module in Example 1;

[0030] Figure 3 This is an exploded schematic diagram of the multidirectional local resonator and bushing ring in Example 1;

[0031] Figure 4 This is a schematic diagram of the first implementation structure in the first embodiment of the multidirectional local resonator in Example 1;

[0032] Figure 5 This is a schematic diagram of the second implementation structure in the first embodiment of the multidirectional local resonator in Example 1;

[0033] Figure 6 This is a schematic diagram of the third implementation structure in the first embodiment of the multidirectional local resonator in Example 1;

[0034] Figure 7 This is an isometric view of the second embodiment of the multidirectional local resonator in Example 1;

[0035] Figure 8 This is a cross-sectional view of the second embodiment of the multidirectional local resonator in Example 1;

[0036] Figure 9 This is a schematic diagram of the interference fit between the bushing ring and the substrate in Example 1;

[0037] Figure 10 This is a schematic diagram of the fit between the bushing ring and the base pin in Example 1;

[0038] Figure 11 This is an isometric view of the multi-directional local resonance module in Example 2;

[0039] Figure 12 This is a cross-sectional view of the multi-directional local resonance module in Example 2;

[0040] Figure 13 This is an isometric view of the first embodiment of the first implementation structure in the first embodiment of the multidirectional local resonator in Example 2;

[0041] Figure 14 This is a cross-sectional view of the first embodiment of the multidirectional local resonator in Example 2;

[0042] Figure 15 This is an isometric view of the second implementation structure in the first embodiment of the multidirectional local resonator in Example 2;

[0043] Figure 16 This is a cross-sectional view of the second implementation structure in the first embodiment of the multidirectional local resonator in Example 2;

[0044] Figure 17 This is an isometric view of the third implementation structure in the first embodiment of the multidirectional local resonator in Example 2;

[0045] Figure 18 This is a cross-sectional view of the third embodiment of the first implementation of the multidirectional local resonator in Example 2;

[0046] Figure 19 This is an isometric view of the second embodiment of the multidirectional local resonator in Example 2;

[0047] Figure 20 This is a cross-sectional view of the second embodiment of the multidirectional local resonator in Example 2;

[0048] Figure 21 This is a schematic diagram of the interference fit between the bushing ring and the substrate in Example 2;

[0049] Figure 22 This is a cross-sectional view of the overall structure of the vibration-damping metamaterial tubular structure in Example 3.

[0050] Reference numerals: 1. Matrix; 2. Multi-directional local resonator; 3. Bushing ring; 4. Triaxial high-stiffness adjustable elastic structure; 5. Mass body; 6. Pin shaft.

[0051] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0053] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0054] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0057] Example 1

[0058] As shown Figure 1-3 in the figure, a multi-directional local resonance module disclosed in this embodiment includes a base body 1, a multi-directional local resonance body 2 and a bushing ring 3. Among them, the multi-directional local resonance body 2 includes a mass body 5 and a three-direction high-adjustable stiffness elastic structure 4, and the multi-directional local resonance body 2 is fixed on the base body 1 in an embedded form.

[0059] In this embodiment, the base body 1 is a hollow beam-shaped or tubular structure, and the mass body 5 is a columnar structure. One end of the three-direction high-adjustable stiffness elastic structure 4 is connected to the outer wall of the mass body 5. The bushing ring 3 is sleeved on the mass body 5 at intervals, and the inner ring wall surface of the bushing ring 3 is connected to the other end of the three-direction high-adjustable stiffness elastic structure 4, and the outer ring wall surface of the bushing ring 3 is fixedly connected to the inner wall of the base body 1.

[0060] As the first implementation manner of the three-direction high-adjustable stiffness elastic structure 4, referring to Figure 4-6 , the three-direction high-adjustable stiffness elastic structure 4 includes a plurality of three-direction high-adjustable stiffness elastic bodies in the shape of columnar bodies. One end of each three-direction high-adjustable stiffness elastic body is distributed on the outer wall of the mass body 5 at intervals along the circumferential direction of the mass body 5, and one end of each three-direction high-adjustable stiffness elastic body is connected to the inner ring wall surface of the same bushing ring 3.

[0061] Preferably, the included angle between the length direction of the three-direction high-adjustable stiffness elastic body and the axial direction of the mass body 5 is angle A, where 0° < A ≤ 90°. Furthermore, the equivalent stiffness of the three-direction high-adjustable stiffness elastic structure 4 vibrating in different degrees of freedom can be changed by adjusting the size of A.

[0062] Further preferably, the cross-sectional shape of the three-direction high-adjustable stiffness elastic body is circular, circular ring-shaped, square, rectangular or polygonal. The cross-sections of the various three-direction high-adjustable stiffness elastic bodies in the same three-direction high-adjustable stiffness elastic structure 4 can be the same or different. As Figure 4 shown, all are three-direction high-adjustable stiffness elastic bodies with circular cross-sections, Figure 5 shown, all are three-direction high-adjustable stiffness elastic bodies with quadrilateral cross-sections, Figure 6 shown, are three-direction high-adjustable stiffness elastic bodies with mixed circular cross-sections and quadrilateral cross-sections. Furthermore, the equivalent stiffness of the three-direction high-adjustable stiffness elastic structure 4 vibrating in different degrees of freedom can be changed by designing different cross-sectional shape parameters.

[0063] Still further preferably, the three-direction high-adjustable stiffness elastic body is a columnar body structure with local hollowing and / or a columnar body structure with variable cross-section and / or a columnar body structure with bending. That is, each three-direction high-adjustable stiffness elastic body can have 0 - 3 of the three changes of local hollowing, variable cross-section, and bending, so as to expand the equivalent stiffness of the three-direction high-adjustable stiffness elastic structure 4 vibrating in different degrees of freedom.

[0064] As the second implementation of the three-way highly adjustable elastic structure 4, refer to Figure 7-8 , the three-way highly adjustable elastic structure 4 is an annular structure sleeved on the outer wall of the mass body 5, specifically, it can be a frustum of a circular cone structure, and the generatrix forms an angle A with the axis of the mass body 5, where 0° < A ≤ 90°. Furthermore, the equivalent stiffness of the three-way highly adjustable elastic structure 4 vibrating in different degrees of freedom can be changed by adjusting the magnitude of A.

[0065] As a preferred implementation, the number of the three-way highly adjustable elastic structures 4 is multiple, and each three-way highly adjustable elastic structure 4 is distributed at intervals along the axis of the mass body 5 on the outer wall of the mass body 5. The bushing rings 3 correspond to the three-way highly adjustable elastic structures 4 one by one, and the bushing rings 3 are connected between the base body 1 and the corresponding three-way highly adjustable elastic structures 4.

[0066] In this embodiment, an interference fit exists between the bushing ring 3 and the base body 1. Refer to Figure 9 , the outer wall surface of the bushing ring 3 is an inclined wall surface with an included angle θ, and the inner wall of the base body 1 is a horizontal wall surface. When the bushing ring 3 is embedded into the base body 1, an interference fit between the bushing ring 3 and the base body 1 can be achieved. Of course, the bushing ring 3 and the base body 1 can also be fixedly connected by a pin shaft 6, as shown in Figure 10 ; or two fixing methods of pin shaft + interference fit are adopted simultaneously.

[0067] In the specific implementation process, the material parameters of the base body 1, the three-way highly adjustable elastic structure, the mass body 5, and the bushing ring 3 can be the same or different.

[0068] Embodiment 2

[0069] As shown in Figure 11-12 , a multi-directional local resonance module disclosed in this embodiment includes a base body 1, a multi-directional local resonance body 2, and a bushing ring 3. Among them, the multi-directional local resonance body 2 includes a mass body 5 and a three-way highly adjustable elastic structure 4, and the multi-directional local resonance body 2 is fixed on the base body 1 in the form of an outer sleeve.

[0070] In this embodiment, the base body 1 is a solid or hollow columnar structure, and the mass body 5 is a hollow columnar structure. One end of the three-way highly adjustable elastic structure 4 is connected to the inner wall of the mass body 5, the mass body 5 is sleeved on the bushing ring 3 at intervals, and the outer wall surface of the bushing ring 3 is connected to the other end of the three-way highly adjustable elastic structure 4, and the inner wall surface of the bushing ring 3 is fixedly connected to the outer wall of the base body 1.

[0071] As the first implementation mode of the three-way high-adjustability elastic structure 4, the three-way high-adjustability elastic structure 4 includes a number of three-way high-adjustability elastic bodies in the shape of columnar bodies. One end of each three-way high-adjustability elastic body is distributed at intervals along the circumferential direction of the mass body 5 on the inner wall of the mass body 5, and the other end of each three-way high-adjustability elastic body is connected to the outer wall surface of the same bushing ring 3.

[0072] Preferably, the angle between the length direction of the three-way high-adjustability elastic body and the axial direction of the mass body 5 is angle A, where 0° < A ≤ 90°. Furthermore, the equivalent stiffness of the three-way high-adjustability elastic structure 4 vibrating in different degrees of freedom can be changed by adjusting the size of A.

[0073] More preferably, the cross-sectional shape of the three-way high-adjustability elastic body is circular, circular ring-shaped, square, rectangular or polygonal. The cross-sections of the three-way high-adjustability elastic bodies in the same three-way high-adjustability elastic structure 4 can be the same or different. For example, Figure 13-14 as shown, all are three-way high-adjustability elastic bodies with circular cross-sections, Figure 15-16 as shown, all are three-way high-adjustability elastic bodies with quadrilateral cross-sections, Figure 17-18 as shown, are three-way high-adjustability elastic bodies with mixed circular and quadrilateral cross-sections. Furthermore, the equivalent stiffness of the three-way high-adjustability elastic structure 4 vibrating in different degrees of freedom can be changed by designing different cross-sectional shape parameters.

[0074] Even more preferably, the three-way high-adjustability elastic body is a columnar body structure with partial hollowing and / or a columnar body structure with variable cross-section and / or a bent columnar body structure. That is, each three-way high-adjustability elastic body can have 0-3 of the three changes of partial hollowing, variable cross-section, and bending, thereby expanding the equivalent stiffness of the three-way high-adjustability elastic structure 4 vibrating in different degrees of freedom.

[0075] As the second implementation mode of the three-way high-adjustability elastic structure 4, referring to Figures 19-20 , the three-way high-adjustability elastic structure 4 is a ring structure fixedly embedded in the inner wall of the mass body 5, specifically a frustum of a circular cone structure. The angle between its generatrix and the axial direction of the mass body 5 is angle A, where 0° < A ≤ 90°. Furthermore, the equivalent stiffness of the three-way high-adjustability elastic structure 4 vibrating in different degrees of freedom can be changed by adjusting the size of A.

[0076] As a preferred implementation mode, the number of the three-way high-adjustability elastic structures 4 is multiple, and each three-way high-adjustability elastic structure 4 is distributed at intervals along the axial direction of the mass body 5 on the inner wall of the mass body 5. The bushing rings 3 correspond to the three-way high-adjustability elastic structures 4 one by one, and the bushing rings 3 are connected between the base body 1 and the corresponding three-way high-adjustability elastic structures 4.

[0077] In this embodiment, the bushing ring 3 and the base 1 are interference fit, as shown in the reference. Figure 21 The outer ring wall of the bushing ring 3 is an inclined wall with an included angle θ, while the inner wall of the base 1 is a horizontal wall. When the bushing ring 3 is embedded in the base 1, an interference fit is achieved between the bushing ring 3 and the base 1. Of course, the bushing ring 3 and the base 1 can also be fixedly connected by a pin, or both pin and interference fit can be used simultaneously.

[0078] In the specific implementation process, the material parameters of the substrate 1, the three-dimensional highly adjustable elastic structure, the mass body 5, and the bushing ring 3 can be the same or different.

[0079] Example 3

[0080] like Figure 22 The illustration shows a vibration-damping and isolation metamaterial tubular structure disclosed in this embodiment, comprising two or more multi-directional local resonance modules as described in Embodiment 1 and / or Embodiment 2, arranged in a predetermined manner. The parameters of the substrate 1 and the multi-directional local resonator 2 in each multi-directional local resonance module may be the same or different. In this embodiment, the substrates in each multi-directional local resonance module are sequentially connected or integrally formed.

[0081] In this embodiment, the substrate 1 and multi-directional local resonator 22 in the multi-directional local resonant module are both formed using resin material 3D printing technology. The substrate 1 is a hollow tube structure with a length of 334 mm and a wall thickness of 5 mm. The mass body 5 is a 16-fold oblique quadrangular prism with an inclination angle of 34.5°. Three multi-directional local resonant modules with the same parameters are arranged into a tube-like structure. Longitudinal and transverse displacement excitations are applied to one end of the structure. The vibration displacement response calculation results show that compared with the optical tube without additional local resonators, in a wide mid-low frequency range of 1500-3000 Hz, the designed tube structure based on multi-directional local resonant modules reduces the vibration displacement response by more than 20 dB for both longitudinal and transverse excitations.

[0082] The results show that the vibration reduction and isolation metamaterial tubular structure in this embodiment has excellent multidimensional vibration reduction and isolation capabilities in the target low and medium frequency bands, and the function of widening the low and medium frequency resonance band can be achieved through the design of local resonance module parameters and the combination design of several local resonance modules.

[0083] It should be noted that all features or methods disclosed in embodiments 1-3 above, except for mutually exclusive features, can be combined in any way. The terms "embedding" and "outer garment" mentioned in this specification are merely descriptions of the spatial position of the multidirectional local resonator 2 relative to the substrate 1. Specific installation methods can be selected according to actual conditions, such as insertion or welding. The connection using the bushing ring 3 proposed in this embodiment is only one preferred installation method. Any feature disclosed in this specification, unless specifically stated otherwise, can be replaced by other equivalent or similar alternative features. Unless specifically stated otherwise, each feature is merely one example in a series of equivalent or similar features.

[0084] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A multidirectional local resonance module, characterized in that, It includes a matrix, a multi-directional local resonator and a bushing ring. The multi-directional local resonator includes a mass and a triaxial stiffness highly adjustable elastic structure. The multi-directional local resonator is fixed to the matrix by embedding or sleeve. When the multi-directional local resonator is fixed to the substrate by embedding: The matrix is ​​a hollow beam or tubular structure, and the mass body is a columnar structure; One end of the triaxial stiffness high adjustable elastic structure is connected to the outer wall of the mass body, the bushing ring is spaced on the mass body, and the inner ring wall of the bushing ring is connected to the other end of the triaxial stiffness high adjustable elastic structure. The outer ring wall of the bushing ring is fixedly connected to the inner wall of the substrate. When the multi-directional local resonator is fixed to the substrate in the form of an outer jacket: The matrix has a columnar structure, and the mass body has a hollow columnar structure; One end of the triaxial stiffness high adjustable elastic structure is connected to the inner wall of the mass body, the mass body is spaced out on the bushing ring, and the outer ring wall of the bushing ring is connected to the other end of the triaxial stiffness high adjustable elastic structure. The inner ring wall of the bushing ring is fixedly connected to the outer wall of the base body. The triaxial stiffness high-adjustable elastic structure includes several columnar triaxial stiffness high-adjustable elastic bodies, one end of each of the triaxial stiffness high-adjustable elastic bodies is distributed circumferentially along the outer or inner wall of the mass body; one end of each of the triaxial stiffness high-adjustable elastic bodies is connected to the inner or outer ring wall of the same bushing ring. The length direction of the triaxial stiffness adjustable elastic body forms an angle A with the axial direction of the mass body, and the equivalent stiffness of its vibration in different degrees of freedom can be changed by adjusting the size of A. The cross-sectional shape of the triaxial stiffness highly adjustable elastic body is circular, annular, or polygonal. Therefore, the equivalent stiffness of the triaxial stiffness highly adjustable elastic structure vibrating in different degrees of freedom can be changed by designing different cross-sectional shape parameters.

2. The multidirectional local resonance module according to claim 1, characterized in that, The triaxial stiffness high-adjustable elastomer is a partially hollowed-out columnar structure and / or a variable cross-section columnar structure and / or a bent columnar structure.

3. The multidirectional local resonance module according to claim 1 or 2, characterized in that, The number of the three-dimensional high-stiffness adjustable elastic structures is multiple, and each of the three-dimensional high-stiffness adjustable elastic structures is distributed at intervals along the axial direction of the mass body on the mass body; The bushing ring corresponds one-to-one with the triaxial stiffness high-adjustable elastic structure, and the bushing ring is connected between the substrate and the corresponding triaxial stiffness high-adjustable elastic structure.

4. The multidirectional local resonance module according to claim 1 or 2, characterized in that, The bushing ring and the substrate are interference fit.

5. The multidirectional local resonance module according to claim 1 or 2, characterized in that, The bushing ring is fixedly connected to the base body by a pin.

6. The multidirectional local resonance module according to claim 1 or 2, characterized in that, The material parameters of the substrate, the triaxial stiffness adjustable elastic structure, the mass body, and the bushing ring may be the same or different.

7. A vibration-damping and isolation metamaterial tubular structure, characterized in that, It includes two or more multidirectional local resonance modules as described in any one of claims 1 to 6, wherein each of the multidirectional local resonance modules is arranged in a predetermined manner.

8. The vibration-damping and isolation metamaterial tubular structure according to claim 7, characterized in that, The parameters of the matrix and the multidirectional local resonance body in each of the aforementioned multidirectional local resonance modules may be the same or different.

Images