Anisotropic metamaterial structure and lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system

Abstract

The present invention discloses an anisotropic metamaterial structure and a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system. The metamaterial structure comprises a plurality of metamaterial structural cells, each of which is sequentially connected along a circumferential direction to form a ring. The metamaterial structural cells comprise a Poisson's ratio-enhanced phase and a high-damping matrix phase. The Poisson's ratio-enhanced phase comprises a first structural member, a second structural member, and a third structural member. The third structural member is connected between the first and second structural members, and the high-damping matrix phase fills the gap between the first and second structural members. The present invention is applied to the field of new materials for pipeline vibration and noise control, and can effectively solve the problem of achieving the integrated design of low-frequency, broadband vibration-damping pipeline systems for equipment under high-pressure and small-size conditions. This provides a promising solution for the multifunctional integrated design of pipeline systems widely used in major fields such as aviation, marine engineering, and mechanical engineering.

Description

Technical Field

[0001] The present invention relates to new materials and technologies for pipeline vibration and noise control, specifically an anisotropic metamaterial structure and a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system, which is expected to be applied to vibration and noise reduction control of infusion pipeline systems in modern chemical industry, ships, aerospace, ocean, nuclear industry, rail transportation and other fields. Background Art

[0002] Major fields such as aviation, aerospace, navigation, rail transportation, engineering machinery, and modern chemical industry are developing rapidly. Fluid power technology is developing towards high pressure, light weight, large flow and high power. Its pipeline materials are facing challenges in complex application environments such as light weight and pressure resistance, and fluid-solid coupling. The resulting acoustic and vibration problems are becoming increasingly prominent. There is an urgent need to carry out research on multifunctional pipeline system design, namely acoustic and vibration control technology (i.e. vibration reduction and noise reduction technology) for complex environments.

[0003] Traditional pipeline vibration and noise reduction technology is widely used and has solved many acoustic and vibration control problems in engineering. However, it still has many obvious shortcomings, including:

[0004] Vibration control for pipeline systems is primarily divided into two approaches: controlling the vibration source and the vibration propagation path. Traditional pipeline vibration control measures generally include applying viscoelastic high-damping vibration-reducing materials to the outside of the pipe wall, laying various low-rigidity, pressure-resistant flexible pipes, installing dynamic vibration absorbers, and erecting elastic supports. These methods are widely used for pipeline vibration reduction, but in actual application, they suffer from several drawbacks, including poor low-frequency vibration reduction, a narrow vibration suppression bandwidth, large additional mass, and large space requirements. Furthermore, they struggle to effectively suppress multi-directional vibrations, such as bending and longitudinal vibrations. Furthermore, due to the distinct low-frequency line spectrum characteristics of pipeline systems and the long propagation distance of low-frequency vibrations, vibration suppression is challenging. Therefore, traditional pipeline vibration control measures in actual engineering practice struggle to effectively suppress low-frequency vibrations in pipeline systems. Consequently, the need for a low-frequency, broadband, and multi-directional vibration control method for pipeline systems is urgent.

[0005] In recent years, the development and advancement of metamaterial technologies in cutting-edge materials fields have provided new ideas and methods for the extraordinary control of sound, force, electromagnetism, and heat. Metamaterials are artificially constructed materials with artificially designed structures that exhibit extraordinary physical properties not possessed by natural materials. Mechanical / acoustic metamaterials, one of the most mainstream branches of metamaterials, can, through artificial structural design, exhibit extraordinary static and dynamic properties not possessed by natural materials, such as negative mass, negative modulus, negative refraction, and double negativity. They can achieve extraordinary control of elastic and acoustic waves, providing a new approach for low-frequency, broadband, and highly efficient vibration isolation and control. Since their emergence, metamaterials have attracted the attention of numerous researchers and engineers, and this research direction has repeatedly achieved gratifying progress.

[0006] However, most of the existing metamaterial technology research only focuses on a single performance and cannot meet the increasingly complex requirements of the vibration and noise reduction environment. No relevant research has been carried out on the performance design of lightweight, pressure-resistant, vibration-reducing and noise-reducing multifunctional integrated pipeline systems. There is an urgent need to develop new high-performance static / dynamic integrated design technologies to solve the problem of multifunctional integrated design of low-frequency broadband pipeline vibration reduction and noise reduction under high pressure and small size conditions. Summary of the Invention

[0007] In response to the above-mentioned deficiencies in the prior art, the present invention provides an anisotropic metamaterial structure and a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system, which introduces the extraordinary physical effects of acoustic / mechanical metamaterials into the vibration and noise reduction design of the structure, thereby effectively solving the problem of how to achieve the integrated design of low-frequency, broadband vibration reduction pipeline systems for equipment under high pressure resistance and small size conditions, and provides a solution with good application prospects for the multifunctional integrated design of pipeline systems widely used in major fields such as aviation and marine engineering, mechanical engineering, etc.

[0008] To achieve the above object, the present invention provides an anisotropic metamaterial structure, comprising a plurality of metamaterial structure cells, wherein the metamaterial structure cells are sequentially connected along a ring direction to form a ring-shaped whole;

[0009] The metamaterial structure cell includes a Poisson's ratio enhanced phase and a high damping matrix phase, and the Poisson's ratio enhanced phase includes a first structural member, a second structural member and at least one third structural member made of a hard material;

[0010] The first structural member and the second structural member are spaced apart from each other, the third structural member is connected between the first structural member and the second structural member, and the high damping matrix fills the gap between the first structural member and the second structural member;

[0011] The first structural members on each of the metamaterial structure cells are sequentially connected to form a first retaining ring, and the second structural members on each of the metamaterial structure cells are sequentially connected to form a second retaining ring.

[0012] In one embodiment, the third structural member has at least one concave surface or convex surface along the annular direction of the annular body.

[0013] In one embodiment, in the circumferential direction of the annular body, part or all of the two adjacent third structural members are connected; or

[0014] Partially or completely, two adjacent third structural members are arranged at intervals.

[0015] In one embodiment, the Young's modulus of the material composed of the Poisson's ratio reinforcement phase is higher than that of the high damping matrix phase by more than one order of magnitude.

[0016] In one embodiment, in the radial direction of the annular body, two sides of the third structural member are flush with the high-damping matrix, or the high-damping matrix covers the third structural member.

[0017] In one embodiment, the high damping matrix is ​​made of a single material, or the high damping matrix is ​​made of a mixture of two or more materials.

[0018] In one embodiment, the first structural member, the second structural member, and the third structural member are beam-shaped structures or plate-shaped structures; or

[0019] The first structural member, the second structural member, and the third structural member are a combination of a beam-like structure and a plate-like structure.

[0020] To achieve the above-mentioned object, the present invention further provides a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system, comprising a first pipeline and a second pipeline connected to each other;

[0021] The first pipeline is a uniform pipeline, and the second pipeline adopts at least two of the above-mentioned anisotropic metamaterial structures, and the anisotropic metamaterial structures are sequentially connected along the axial direction of the annular whole.

[0022] In one embodiment, there are multiple first pipelines and multiple second pipelines, and the first pipelines and the second pipelines are sequentially staggered and connected;

[0023] The lengths of the first pipelines are the same or different, and the numbers of the anisotropic metamaterial structures on the second pipelines are the same or different.

[0024] In one embodiment, an auxiliary functional layer and / or an expansion cavity and / or a sound-absorbing cotton are laid on the first pipeline and / or the second pipeline.

[0025] Compared with the prior art, the present invention has the following beneficial technical effects:

[0026] Pushing the boundaries of material and structure mechanical performance is a perpetual pursuit in engineering. The anisotropic metamaterial structure described in this invention, through effective structural design, has resulted in a class of anisotropic metamaterials with significantly different equivalent Young's moduli (i.e., equivalent stiffness) in two or more directions, and a Poisson's ratio that can simultaneously exhibit positive, negative, or zero properties in different directions. When used as the foundation material for piping systems, these anisotropic metamaterial piping units, through periodic arrays in radial, axial, and circumferential directions, can exhibit macroscopically "low stiffness" in one or more directions and "high stiffness" in other directions. Compared to traditional piping materials, these metamaterials exhibit not only anisotropy in elastic modulus but also varying Poisson's ratios in different directions. This breaks the limitation of uniform properties along all principal axes (i.e., isotropy) and possesses extraordinary material properties not found in natural materials, providing rich and flexible design possibilities for pipeline acoustic vibration suppression systems. 2. Although traditional pipeline vibration reduction technologies have proposed certain vibration reduction schemes for vibration suppression, most of them only consider the dynamic performance of the pipeline system. It is often difficult to meet the multifunctional properties such as light weight and pressure resistance required by complex engineering environments, and is not suitable for complex application scenarios such as existing high speed and heavy load. The present invention uses an anisotropic metamaterial pipeline composed of an array, which is combined with a uniform pipeline material and then arranged periodically to form a complete new lightweight and pressure-resistant multifunctional pipeline acoustic vibration suppression system. It is based on the Bragg scattering effect. The traveling waves in the structure undergo complex multiple elastic scattering between the periodic structures, which effectively suppresses the propagation of broadband vibration waves, can achieve an ultra-low frequency band gap in a smaller size, effectively improves space utilization, and provides a new idea for the design of ultra-low frequency broadband pipeline acoustic vibration suppression systems.

[0027] 3. Existing metamaterial pipeline acoustic vibration suppression systems often use a combination of soft rubber uniform pipes and other uniform pipe materials. Although they can suppress vibrations within a certain range, their rubber stiffness is relatively low and they are often unable to adapt to complex engineering environments. This greatly limits the application and development of metamaterial pipeline acoustic vibration suppression systems. The lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system designed in the present invention is constructed based on a new type of anisotropic metamaterial primitive. For example, the lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system can maintain low axial stiffness while maintaining high stiffness properties in the circumferential and radial directions through a special array and design. Therefore, it can maintain the dynamic characteristics of low-frequency broadband vibration reduction in the axial direction while maintaining pressure resistance in the circumferential and radial directions, providing a new solution to the realistic design requirements of "high static and low dynamic" in engineering.

[0028] 5. The anisotropic metamaterial structure and lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system of the present invention have ultra-low-frequency, broadband bandgap characteristics generated by the structural anisotropy. Vibration waves within the bandgap are effectively blocked and dissipated. Therefore, it can simultaneously take into account the multi-directional vibration control functions of bending vibration, torsional vibration, and longitudinal vibration. It can effectively control the longitudinal low-frequency vibration of the pipeline, achieve a multi-directional vibration reduction effect for the pipeline system, and greatly improve the low-frequency vibration reduction performance of the structure.

[0029] 6. Compared with the traditional pipeline vibration reduction system, which has the defect of single performance, the lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system designed by the present invention not only has good vibration reduction performance, but also, due to its special periodicity and Bragg scattering effect, it also has low-frequency and broadband acoustic wave band gap characteristics under the excitation of broadband sound signals, thereby achieving effective control of the propagation of low-frequency and broadband flow noise in the pipeline system. Therefore, the lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system designed by the present invention is actually a new type of pipeline acoustic vibration suppression system that takes into account acoustic-solid coupling and integrates noise elimination and vibration reduction functions. It can comprehensively control the propagation of pipe wall structural vibration and flow noise in the pipeline system, thereby achieving comprehensive control of the low-frequency acoustic vibration propagation of the pipeline. In addition, due to its effective attenuation of pipeline vibration and noise, it actually also has a significant inhibitory effect on structural sound radiation.

[0030] 7. The anisotropic metamaterial structure and lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system of this invention features a simple overall structure, easy processing, and modular assembly for application. Furthermore, the structure offers ample design space, numerous adjustable parameters, and can be combined with topology optimization and other techniques to enable rapid design and adjustment based on engineering requirements and target frequency bands. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0032] Figure 1 Schematic diagram of the front view of the metamaterial structure cell in Example 1 of the present invention;

[0033] Figure 2 Schematic side view of a metamaterial structure cell in Example 1 of the present invention;

[0034] Figure 3 This is a schematic diagram of a first implementation method of the basic structure of the third structural member in Example 1 of the present invention;

[0035] Figure 4This is a schematic diagram of a second implementation method of the basic structure of the third structural member in Example 1 of the present invention;

[0036] Figure 5 This is a schematic diagram of a third implementation method of the basic structure of the third structural member in Example 1 of the present invention;

[0037] Figure 6 This is a schematic diagram of the first implementation method of the Poisson's ratio enhancement phase in Example 1 of the present invention;

[0038] Figure 7 This is a schematic diagram of the second implementation method of the Poisson's ratio enhancement phase in Example 1 of the present invention;

[0039] Figure 8 This is a schematic diagram of the third implementation method of the Poisson's ratio enhancement phase in Example 1 of the present invention;

[0040] Figure 9 This is a schematic diagram of a first embodiment of a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system in Example 2 of the present invention;

[0041] Figure 10 This is a schematic diagram of a second embodiment of the lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system in Example 2 of the present invention;

[0042] Figure 11 This is a schematic diagram of a third embodiment of the lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system in Example 2 of the present invention;

[0043] Figure 12 This is a schematic diagram of a fourth embodiment of the lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system in Example 2 of the present invention;

[0044] Figure 13 This is a schematic diagram of an implementation scheme of a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system in Example 3 of the present invention;

[0045] Figure 14 This is a schematic diagram of an implementation scheme of a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system in Example 4 of the present invention;

[0046] Figure 15 This is a schematic diagram of an implementation scheme of a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system in Example 5 of the present invention;

[0047] Figure 16 This is a schematic diagram of an implementation scheme of a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system in Example 6 of the present invention;

[0048] Figure 17 This is a schematic diagram of an implementation scheme of a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system in Example 7 of the present invention;

[0049] Figure 18This is a diagram showing the longitudinal wave vibration reduction effect of the acoustic vibration suppression system in an embodiment of the present invention;

[0050] Figure 19 This is a diagram showing the bending wave vibration reduction effect of the acoustic vibration suppression system according to an embodiment of the present invention;

[0051] Figure 20 This is a diagram showing the torsional wave vibration reduction effect of the acoustic vibration suppression system in an embodiment of the present invention;

[0052] Figure 21 This is a diagram showing the noise reduction effect of the acoustic vibration suppression system in an embodiment of the present invention.

[0053] Reference numerals: Poisson's ratio enhanced phase 1 , first structural component 101 , second structural component 102 , third structural component 103 , high damping matrix phase 2 , first pipeline 3 , second pipeline 4 , confinement ring 5 , functional layer 6 .

[0054] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0056] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention 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.

[0057] In addition, the terms "first," "second," and so on, used in this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0058] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection, electrical connection, physical connection, or wireless communication connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0060] Example 1

[0061] This embodiment discloses an anisotropic metamaterial structure (hereinafter referred to as "metamaterial structure"), which includes a plurality of metamaterial structure cells, each of which is sequentially connected along the annular direction to form an annular whole. Figure 1 、 Figure 2 The metamaterial structure cell is a solid shell structure composed of a Poisson's ratio enhanced phase 1 and a high damping matrix phase 2. The Young's modulus of the material composed of the Poisson's ratio enhanced phase 1 is more than one order of magnitude higher than that of the high damping matrix phase 2. For example, the material of the Poisson's ratio enhanced phase 1 is an aluminum alloy, and its Young's modulus is 8×10 4 MPa, and the material of the high-damping matrix phase 2 can be selected from butyl rubber, which has a Young's modulus of 23.8 MPa. Specifically, the Poisson's ratio enhancement phase includes a first structural member 101, a second structural member 102, and at least one third structural member 103 made of a hard material. The first structural member 101 and the second structural member 102 are spaced apart, and the third structural member 103 is connected between the first structural member 101 and the second structural member 102. The first structural member 101 on each metamaterial structural cell is sequentially connected to form a first retaining ring, and the second structural member 102 on each metamaterial structural cell is sequentially connected to form a second retaining ring. The high-damping matrix phase 2 fills the gap between the first structural member 101 and the second structural member 102, thereby forming a closed pipeline interval, which can provide the pipeline system with low stiffness in one or / and multiple directions and one or / and multiple high stiffness.

[0062] In this embodiment, the axial length and radial thickness of the metamaterial structure cell are both set to 0.05m, and the circumferential angle is set to 9°. Therefore, 40 metamaterial structure cells need to be arranged along the circumference to form a basic circular ring, which can then be arranged axially to form pipeline systems of different lengths.

[0063] In this embodiment, the Poisson's ratio enhancement phase 1 can be combined through beam or plate units to achieve positive, negative and zero Poisson's ratio characteristics on a macro scale. Specifically, it is a straight plate combination form or an arc plate combination form or a combination of straight plates and arc plates. Its material can be steel, iron, aluminum alloy, plastic, composite material, reinforced concrete or wood, and the combination method is adhesive connection, riveting, snap connection or bolt fixed connection.

[0064] As a preferred embodiment, in the annular direction of the metamaterial structure, the third structural member 103 has at least one concave surface or convex surface, so that the structure can exhibit completely different mechanical properties in different directions, for example Figure 3 As shown, the third structural member 103 can be designed as a wave-shaped structure, or it can be set as Figure 4 The arc structure shown can also be set to Figure 5 The "tuning fork-shaped" structure shown. Of course, the third structural member 103 can also be designed in other structural forms, which will not be detailed in this embodiment. It is worth noting that within the same metamaterial structure, each third structural member 103 can have the same structural form or different structural forms. Along the circumferential direction of the metamaterial structure, some or all adjacent third structural members 103 can be connected; alternatively, some or all adjacent third structural members 103 can be arranged with an interval.

[0065] In the specific implementation process, the first structural member 101, the second structural member 102, and the third structural member 103 are beam-shaped structures or plate-shaped structures; or the first structural member 101, the second structural member 102, and the third structural member 103 are a combination of beam-shaped structures and plate-shaped structures. For example, the Poisson's ratio enhancement phase 1 can be set to Figure 6 The honeycomb shape shown in the figure, in this case, the Poisson's ratio reinforcement phase 1 has two third structural members 103, and the two third structural members 103 are symmetrical convex bent plates. Alternatively, the Poisson's ratio reinforcement phase 1 can be set as Figure 7 The concave auxetic shape shown in the figure, in this case, the Poisson's ratio reinforcement phase 1 has two third structural members 103, and the two third structural members 103 are symmetrical concave bent plates. It is worth noting that in specific applications, the honeycomb-shaped Poisson's ratio reinforcement phase 1 and the concave auxetic Poisson's ratio reinforcement phase 1 are arranged alternately in sequence to form a ring-shaped overall frame part. Of course, the Poisson's ratio reinforcement phase 1 can also be set as Figure 8 The semi-reentrant honeycomb shape or other structural forms shown will not be described in detail in this embodiment.

[0066] In this embodiment, the Poisson's ratio enhancement phase 1 can also tune the macroscopic Poisson's ratio of the pipeline system, and can be designed and adjusted according to actual needs. For example, the Poisson's ratio enhancement phase 1 is designed to be Figure 6 In the form, the macroscopic Poisson's ratio shows a positive Poisson's ratio characteristic; the Poisson's ratio enhancement phase 1 is designed to be Figure 7In the form, the macroscopic Poisson's ratio shows a negative Poisson's ratio characteristic; the Poisson's ratio enhancement phase 1 is designed to be Figure 8 In the form of, the macroscopic Poisson's ratio exhibits the characteristics of zero Poisson's ratio.

[0067] In this embodiment, the high damping matrix 2 is made of a single material or a mixture of two or more materials. For example, it can be a single material or a combination of multiple materials such as rubber, plastic, composite material or wood. It is connected and fixed to the Poisson's ratio reinforcement phase 1 through connection processes such as gluing and vulcanization.

[0068] Example 2

[0069] This embodiment discloses a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system, which mainly includes a first pipeline 3 and a second pipeline 4. The first pipeline 3 is a traditional uniform pipeline, and the second pipeline 4 is composed of at least two metamaterial structures in Example 1 connected in series along the axial direction. The first pipeline 3 and the second pipeline 4 are connected in series, for example Figure 9 The structural form and quantity of the third structural members 103 in each metamaterial structure constituting the second pipeline 4 may be the same or different.

[0070] As a preferred embodiment, there are multiple first pipes 3 and second pipes 4, and each first pipe 3 and second pipe 4 is connected in sequence. The lengths of the first pipes 3 are the same or different, and the number of anisotropic metamaterial structures on each second pipe 4 is the same or different. For example Figure 10 The lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system shown is composed of three first pipelines 3 and three second pipelines 4. The axial lengths of the first pipelines 3 and the second pipelines 4 are the same. Figure 11 The lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system shown is also composed of three first pipelines 3 and three second pipelines 4, wherein the three second pipelines 4 are respectively composed of 5, 9, and 15 metamaterial structures connected in series along the axial direction, and are combined with three first pipelines 3 of equal length to ultimately achieve broadband vibration reduction. Figure 12 The lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system shown is also composed of three first pipelines 3 and three second pipelines 4. The three second pipelines 4 are each composed of 9 metamaterial structures connected in series along the axial direction. Combined with three first pipelines 3 with lengths of 0.6m, 1.2m, and 1.5m respectively, it can change the Bragg scattering properties of the structure, thereby improving the vibration reduction efficiency.

[0071] Example 3

[0072] This embodiment discloses a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system, the implementation of which is basically the same as that of Example 2, except that: in this embodiment, the first pipeline 3 and the second pipeline 4 are both square tube configurations, that is, the square second pipeline 4 is obtained by extending the metamaterial structure in three mutually perpendicular main axis directions, and then combined with the traditional square uniform pipeline to form, for example Figure 13 shown.

[0073] Example 4

[0074] This embodiment discloses a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system, and its implementation is basically the same as that of Example 2, except that: the lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system in this embodiment further includes a constraint ring 5, which is provided in the first pipeline 3 and / or the second pipeline 4, for example Figure 14 The material of the restraining ring 5 can be steel, iron, aluminum alloy, plastic, composite material, reinforced concrete or wood to further enhance the structural strength and pressure resistance.

[0075] Example 5

[0076] This embodiment discloses a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system, and its implementation is basically the same as that of Example 2, except that: in this embodiment, the high-damping matrix phase 2 completely covers the third structural member 103, and finally forms a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system, for example Figure 15 shown.

[0077] Example 6

[0078] This embodiment discloses a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system, and its implementation is basically the same as that of Example 2, except that: the lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system in this embodiment further includes a functional layer 6, which can be laid on the inner wall and / or outer wall of the pipeline acoustic vibration suppression system, for example Figure 16 The material of the functional layer 6 can be composed of damping material, sound-absorbing cotton, and foam aluminum functional material to provide auxiliary vibration reduction and / or sound absorption and / or water insulation and / or heat insulation functions.

[0079] Example 7

[0080] This embodiment discloses a lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system, and its implementation is basically the same as that of Example 2, except that: the first pipeline 3 in this embodiment is an expansion cavity pipeline, which can be used to enhance the acoustic suppression performance, for example Figure 17 shown.

[0081] refer to Figure 18 The longitudinal wave vibration transmissibility curve of the acoustic vibration suppression system in this embodiment is as follows: Figure 18It can be seen that in the low-frequency broadband range of 0-1000 Hz, compared with the traditional structure and traditional damping vibration reduction piping system, the vibration signal attenuation amplitude reaches an average of 43 dB, and the maximum attenuation is as high as 85 dB, achieving a low-frequency broadband and efficient longitudinal wave vibration suppression effect.

[0082] refer to Figure 19 The bending wave vibration transmissibility curve of the acoustic vibration suppression system in this embodiment is as follows: Figure 19 It can be seen that within the low-frequency broadband range of 0-1000Hz, compared with the traditional structure and traditional damping vibration reduction piping system, the vibration signal attenuation amplitude reaches an average of 32dB, achieving a low-frequency broadband and efficient bending wave vibration suppression effect.

[0083] refer to Figure 20 The torsional wave vibration transmissibility curve of the acoustic vibration suppression system in this embodiment is as follows: Figure 20 It can be seen that within the low-frequency broadband range of 0-1000 Hz, the vibration signal attenuation amplitude is increased by nearly 35 dB compared with the traditional structure and traditional damping vibration reduction piping system, achieving a low-frequency broadband and efficient torsional wave vibration suppression effect.

[0084] refer to Figure 21 The sound transmission loss curve of the acoustic vibration suppression system in this embodiment is as follows: Figure 21 It can be seen that in the low-frequency broadband range of 0-1000Hz, compared with the traditional structure and traditional damping vibration reduction piping system, the sound transmission loss amplitude can reach up to 7.8 dB, with an average improvement of 5.1 dB, achieving a low-frequency broadband and efficient sound wave attenuation effect.

[0085] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An anisotropic metamaterial structure, characterized in that: It comprises a plurality of metamaterial structure cells, wherein the metamaterial structure cells are sequentially connected along a ring direction to form a ring-shaped whole; The metamaterial structure cell includes a Poisson's ratio enhanced phase and a high damping matrix phase, and the Poisson's ratio enhanced phase includes a first structural member, a second structural member and at least one third structural member made of a hard material; The first structural member and the second structural member are spaced apart from each other, the third structural member is connected between the first structural member and the second structural member, and the high damping matrix fills the gap between the first structural member and the second structural member; The first structural members on each of the metamaterial structure cells are sequentially connected to form a first retaining ring, and the second structural members on each of the metamaterial structure cells are sequentially connected to form a second retaining ring; In the annular direction along the annular body, the third structural member has at least one concave surface or convex surface.

2. The anisotropic metamaterial structure according to claim 1, characterized in that In the circumferential direction of the annular body, some or all of the adjacent two third structural members are connected; or Partially or completely, two adjacent third structural members are arranged at intervals.

3. The anisotropic metamaterial structure according to claim 1 or 2, characterized in that: The Young's modulus of the material composed of the Poisson's ratio reinforcement phase is higher than that of the high damping matrix phase by more than one order of magnitude.

4. The anisotropic metamaterial structure according to claim 1 or 2, characterized in that: In the radial direction of the annular body, two sides of the third structural member are flush with the high-damping matrix, or the high-damping matrix covers the third structural member.

5. The anisotropic metamaterial structure according to claim 1 or 2, characterized in that: The high-damping matrix is ​​made of a single material, or the high-damping matrix is ​​made of a mixture of two or more materials.

6. The anisotropic metamaterial structure according to claim 1 or 2, characterized in that: The first structural member, the second structural member, and the third structural member are beam-shaped structures or plate-shaped structures; or The first structural member, the second structural member, and the third structural member are a combination of a beam-like structure and a plate-like structure.

7. A lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system, characterized in that: comprising a first pipeline and a second pipeline connected to each other; The first pipeline is a uniform pipeline, and the second pipeline adopts at least two anisotropic metamaterial structures according to any one of claims 1 to 6, and the anisotropic metamaterial structures are sequentially connected along the axial direction of the annular whole.

8. The lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system according to claim 7 is characterized in that: There are multiple first pipelines and multiple second pipelines, and the first pipelines and the second pipelines are connected in sequence in an interlaced manner; The lengths of the first pipelines are the same or different, and the numbers of the anisotropic metamaterial structures on the second pipelines are the same or different.

9. The lightweight, pressure-resistant, multifunctional pipeline acoustic vibration suppression system according to claim 7 or 8, characterized in that: An auxiliary functional layer and / or an expansion cavity and / or sound-absorbing cotton are laid on the first pipeline and / or the second pipeline.

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