Novel lightweight pressure-resistant multifunctional metamaterial pipe muffler system

Abstract

The application discloses a novel light-weight pressure-resistant multifunctional metamaterial pipeline silencer system, which comprises an expansion section, a base section and a transition section; the two ends of the expansion section are connected with the base section through the transition section, and the inner diameter of the expansion section is larger than the outer diameter of the base section; the expansion section comprises at least one annular metamaterial base ring, the metamaterial base ring comprises a plurality of anisotropic super-structure shell units connected in sequence along the ring direction, and each anisotropic super-structure shell unit comprises a rigid support framework and a flexible support material; the rigid support framework is provided with holes, and the flexible support material is filled in the holes of the rigid support framework and between two adjacent rigid support frameworks. The application relates to the field of pipeline noise control and can effectively solve the problem of how to realize the integrated design of a pipeline system low-frequency broadband silencer system under the conditions of high pressure resistance and small size, thereby providing a solution with good application prospect for the design of pipeline systems widely used in the fields of aviation and navigation engineering and mechanical engineering.

Description

Technical Field

[0001] This invention relates to new materials and technologies for pipeline noise control, specifically a novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system, which is expected to be applied to noise control of infusion pipeline systems in modern chemical, shipbuilding, aerospace, marine, and nuclear industries. Background Technology

[0002] Fluid delivery pipeline systems are widely used in industries such as manufacturing, shipbuilding, aerospace, marine, and nuclear industries. They are primarily used to carry the propagation of fluids to transfer energy, momentum, and mass, and are widely applied in equipment such as ships, aircraft, rockets, and rail transportation. The flow of fluid in a pipeline system generates pressure wave pulsations, which can easily couple with vibrations in the pipe wall structure, resulting in strong noise.

[0003] Noise in seawater pipeline systems can be mainly divided into pipe wall vibration noise and internal fluid noise. Among these, flow noise has the greatest impact on the total radiated noise at the pipe inlet, exhibiting minimal attenuation and long propagation distance within the fluid medium. The basic approach to controlling noise in seawater pipeline systems generally focuses on controlling both the noise source and the noise propagation path. For flow noise control, source control often involves designing and using low-noise pumps and valves. However, due to the structural characteristics of centrifugal pumps and the functional characteristics of valves and other control components, noise can only be reduced to a certain extent, not completely eliminated. Furthermore, the variable operating conditions of machinery and ships make it difficult to avoid noise caused by the sudden opening and closing of pumps and valves. Controlling the flow noise propagation path, on the other hand, becomes highly feasible, with the most common measure being the installation of silencer units. However, existing pipeline silencers either have too narrow a low-frequency silencing bandwidth (e.g., resonant silencers, while capable of attenuating and suppressing convective noise in lower frequency bands, have a narrow silencing bandwidth) or too high a silencing frequency (e.g., expansion silencers, while effective in mid-to-high frequency silencing, have limited low-frequency silencing due to space constraints), making it difficult to meet the low-frequency broadband noise control requirements of seawater pipeline systems. Furthermore, with the rapid development of aerospace, ocean shipping, and other fields, fluid dynamics technology is evolving towards high pressure, lightweight, high flow rate, and high power; therefore, the need for developing new multifunctional pipeline noise control systems is extremely urgent. Summary of the Invention

[0004] To address the shortcomings of the existing technologies, this invention provides a novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system. It introduces the extraordinary physical effects of acoustic / mechanical metamaterials into the vibration reduction and noise reduction design of the structure, thereby effectively solving the problem of how to achieve integrated design of low-frequency broadband silencer systems for equipment pipelines 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 aerospace and marine engineering, and mechanical engineering.

[0005] To achieve the above objectives, the present invention provides a novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system, comprising an expansion section, a foundation section, and a transition section of the pipeline structure;

[0006] The expansion section is connected to the base section at both ends via the transition section, and the inner diameter of the expansion section is larger than the outer diameter of the base section.

[0007] The expansion section includes at least one annular metamaterial base ring. When there are two or more metamaterial base rings on the expansion section, each metamaterial base ring is connected sequentially along the axial direction.

[0008] The metamaterial base ring includes several anisotropic metashell units connected sequentially along the circumferential direction. Each anisotropic metashell unit includes a rigid support frame and a flexible support material.

[0009] The rigid support frame has at least one hole, and the rigid support frames of two adjacent anisotropic metashell units are connected. The flexible support material fills the hole in the rigid support frame and between the two adjacent rigid support frames.

[0010] In one embodiment, the inner diameter of the expansion segment is at least 1.1 times the outer diameter of the base segment.

[0011] In one embodiment, the elastic modulus of the material used for the rigid support frame is at least one order of magnitude higher than that of the flexible support material.

[0012] In one embodiment, the flexible support material is made of a single material, or the flexible support material is made of a mixture of two or more materials.

[0013] In one embodiment, the flexible support material covers the rigid support frame on the outer wall portion of the expansion section; and / or

[0014] The flexible support material covers the rigid support frame on the inner wall portion of the expansion section.

[0015] In one embodiment, the outer and / or inner walls of the expansion section are covered with a functional layer for vibration damping, sound absorption, and / or heat insulation.

[0016] In one embodiment, the base section consists of uniform conduits; or

[0017] The base section is a metamaterial conduit, and the metamaterial conduit includes at least one metamaterial base ring in the axial direction; or

[0018] One part of the base section consists of uniform pipelines, and the other part consists of metamaterial pipelines, with the uniform pipelines and metamaterial pipelines being distributed alternately.

[0019] In one embodiment, the transition section consists of a uniform conduit; or

[0020] The transition section is a metamaterial conduit, and the metamaterial conduit includes at least one metamaterial base ring in the axial direction; or

[0021] The transition section consists of a uniform pipeline and a metamaterial pipeline, with the uniform pipeline and the metamaterial pipeline being distributed alternately.

[0022] In one embodiment, the number of expansion segments is multiple, and a base segment is present between two adjacent expansion segments;

[0023] The inner diameters of each expansion segment may be the same or different, the outer diameters of each expansion segment may be the same or different, and the axial lengths of each expansion segment may be the same or different.

[0024] The inner diameters of each of the aforementioned base segments may be the same or different, the outer diameters of each of the aforementioned base segments may be the same or different, and the axial lengths of each of the aforementioned base segments may be the same or different.

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

[0026] 1. In this invention, the anisotropic metashell unit of the pipeline muffler system is composed of a rigid support frame and a flexible support material. Its mechanical properties can be determined or provided by the rigid support frame. The flexible design of the rigid support frame can make the pipeline muffler system exhibit completely different static / dynamic characteristics. For example, the pipeline muffler system, composed of a specially designed rigid frame and a flexible support material, can exhibit "low stiffness" in the axial direction and "high stiffness" in the radial and circumferential directions. Compared with traditional pipeline mufflers, this invention is more flexible in terms of static and dynamic characteristic design and can meet the muffler design requirements under different working conditions.

[0027] 2. While traditional research on pipeline silencers has proposed some solutions for noise control, most only consider the dynamic performance of the pipeline system. These solutions often fail to meet the multi-functional requirements of lightweight and pressure resistance in complex engineering environments, making them unsuitable for complex applications such as high-speed and heavy-load applications. The novel pipeline silencer system designed in this invention is based on the principle of reactive silencers and modal coupling mechanisms. Sound waves in the medium undergo complex sound scattering at the abrupt interface of the silencer, effectively reflecting the sound energy. Furthermore, the pipeline silencer system designed in this invention enhances the coupling between the medium in the pipeline and the pipe wall material (i.e., anisotropic metashell units), thereby further enhancing the noise reduction effect of the pipeline system. Compared to traditional pipeline silencers, it achieves highly efficient ultra-low frequency noise reduction within a smaller size, providing a completely new design approach for pipeline system silencer design and noise control.

[0028] 3. The pipeline silencer system of the present invention has a simple overall structure, is easy to process and modularly assembled and applied. At the same time, the structural design space is sufficient, and there are many adjustable parameters that can be combined with topology optimization and other technologies to achieve rapid design and adjustment according to the needs of the engineering environment and the target frequency band requirements. Attached Figure Description

[0029] 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.

[0030] Figure 1 This is a schematic diagram of the first embodiment of the pipeline silencer system in Embodiment 1 of the present invention;

[0031] Figure 2 This is a schematic diagram of a second embodiment of the pipeline silencer system in Embodiment 1 of the present invention;

[0032] Figure 3 This is a schematic diagram of the first embodiment of the anisotropic metashell unit in Embodiment 1 of the present invention;

[0033] Figure 4 This is a schematic diagram of the second embodiment of the anisotropic metashell unit in Embodiment 1 of the present invention;

[0034] Figure 5 This is a schematic diagram of the third embodiment of the anisotropic metashell unit in Embodiment 1 of the present invention;

[0035] Figure 6 This is a schematic diagram of the first embodiment of the rigid support frame in Embodiment 1 of the present invention;

[0036] Figure 7 This is a schematic diagram of a second embodiment of the rigid support frame in Embodiment 1 of the present invention;

[0037] Figure 8 This is a schematic diagram of a third embodiment of the rigid support frame in Embodiment 1 of the present invention;

[0038] Figure 9 This is a schematic diagram of the sound transmission loss curve of the pipeline silencer system in Embodiment 1 of the present invention;

[0039] Figure 10 This is a schematic diagram of one embodiment of the pipeline silencer system in Embodiment 2 of the present invention;

[0040] Figure 11 This is a schematic diagram of one embodiment of the pipeline silencer system in Embodiment 3 of the present invention;

[0041] Figure 12 This is a schematic diagram of one embodiment of the pipeline silencer system in Embodiment 4 of the present invention;

[0042] Figure 13 This is a schematic diagram of one embodiment of the pipeline silencer system in Embodiment 5 of the present invention.

[0043] The reference numerals are: Expansion section 1, Basic section 2, Transition section 3, Rigid support frame 4, Flexible support material 5, Functional layer 6.

[0044] 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

[0045] 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.

[0046] 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 positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0047] 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.

[0048] 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.

[0049] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If 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.

[0050] Example 1

[0051] like Figure 1 , Figure 2 The present embodiment discloses a novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system, which mainly includes an expansion section 1, a base section 2, and a transition section 3 of the pipeline structure. The two ends of the expansion section 1 are connected to the base section 2 through the transition section 3. The inner diameter of the expansion section 1 is larger than the outer diameter of the base section 2, and the inner diameter of the expansion section 1 is at least 1.1 times the outer diameter of the base section 2, thereby reducing the internal fluid velocity and allowing the pressure wave to diffuse, thus achieving a silencing effect.

[0052] In this embodiment, the expansion segment 1 includes at least one annular metamaterial base ring. When there are two or more metamaterial base rings on the expansion segment 1, the metamaterial base rings are connected sequentially along the axial direction. On the same expansion segment 1, the inner diameters of the metamaterial base rings can be the same or different, as long as the inner diameter of the smallest metamaterial base ring is greater than the outer diameter of the base segment 2. Similarly, the outer diameters of the metamaterial base rings can be the same or different; and the axial lengths of the metamaterial base rings can be the same or different. (Reference) Figure 3The metamaterial base ring includes several anisotropic metashell units connected sequentially along the circumferential direction. Each anisotropic metashell unit includes a rigid support frame 4 and a flexible support material 5. The rigid support frame 4 has at least one hole. The rigid support frames 4 on two adjacent anisotropic metashell units in the circumferential and axial directions are fixedly connected by means of integral molding, welding, bolting, gluing, riveting or snap-fit ​​connection. The flexible support material 5 fills the hole of the rigid support frame 4 and the gap between two adjacent rigid support frames 4.

[0053] It is worth noting that, although Figure 3 The rigid support frame 4 and the flexible support material 5 shown are flush on both the inner and outer surfaces of the anisotropic metashell unit. However, in specific applications, alternative methods can also be used. Figure 4 The structure shown here has the flexible support material 5 completely covering the rigid support frame 4 on the inner surface of the anisotropic metashell unit, meaning the flexible support material 5 covers the rigid support frame 4 on the inner wall of the expansion section 1. Alternatively, the flexible support material 5 can also completely cover the rigid support frame 4 on the outer surface of the anisotropic metashell unit, meaning the flexible support material 5 covers the rigid support frame 4 on the outer wall of the expansion section 1. Or as... Figure 5 As shown, on the inner and outer surfaces of the anisotropic metashell unit, the flexible support material 5 completely covers the rigid support frame 4, that is, the flexible support material 5 covers the rigid support frame 4 on both the outer and inner wall portions of the expansion section 1.

[0054] In this embodiment, the elastic modulus of the material used for the rigid support frame 4 is at least an order of magnitude higher than that of the flexible support material 5. For example, the material of the rigid support frame 4 can be steel, with an elastic modulus of 207 GPa, and the material of the flexible support material 5 can be rigid foam, with an elastic modulus of 62 MPa. Specifically, the material of the rigid reinforcing frame can be steel, iron, aluminum alloy, plastic, composite material, reinforced concrete, or wood, etc., and its combination method can be integral molding, welding, bolting, gluing, riveting, or snap-fit ​​connection, etc. The flexible support material 5 is made of a single material, such as rubber, plastic, composite material, or wood, etc.; or the flexible support material 5 can also be composed of two or more materials mixed together, and its combination method can be gluing, vulcanization, etc.

[0055] In practical implementation, the rigid support frame 4 can be configured as a shell structure with elliptical openings, for example... Figure 6 As shown; the rigid support frame 4 can also be configured as a pentagonal chiral structure, for example... Figure 7 As shown; the rigid support frame 4 can also be configured as a U-shaped structure, for example... Figure 8 As shown. Of course, the rigid support frame 4 can also be designed in other structural forms, which will not be described in detail in this embodiment.

[0056] In practical applications, alterations to the micromechanical properties of anisotropic metashell elements can provide low stiffness in one or more directions and high stiffness in one or more directions for macroscopic pipeline muffler systems. Furthermore, anisotropic metashell elements can tune the macroscopic Poisson's ratio of the pipeline muffler system, allowing for flexible adjustment within the range of -1 to 1 according to specific requirements. For example, the rigid support frame 4 is designed as... Figure 4 In this form, the macroscopic Poisson's ratio of the structure is close to 0; the rigid support frame 4 is designed as... Figure 6 In this form, the macroscopic Poisson's ratio of the structure is much less than 0; the rigid support frame 4 is designed as... Figure 8 In this form, the macroscopic Poisson's ratio of the structure is much greater than 0.

[0057] In practical implementation, the foundation section 2 can be entirely composed of existing traditional uniform pipelines. Alternatively, the foundation section 2 can be entirely composed of metamaterial pipelines, the structure of which is basically the same as that of the expansion section 1, consisting of at least one metamaterial base ring, the only difference being the inner and outer diameters compared to the expansion section 1. For example... Figure 1 As shown; Figure 1 In the middle; or part of the basic section 2 is a uniform pipeline, and the other part is a metamaterial pipeline, with the uniform pipeline and the metamaterial pipeline interspersed, for example. Figure 2 As shown.

[0058] In practical implementation, transition section 3 can be configured as a straight annular structure, meaning the outer diameter of transition section 3 is the same as the outer diameter of expansion section 1, and the inner diameter of transition section 3 is the same as the inner diameter of base section 2. Alternatively, transition section 3 can be a tapered structure with equal outer diameter and proportional contraction, meaning the end of transition section 3 with the larger inner and outer diameters is connected to expansion section 1, and the end with the smaller inner and outer diameters is connected to base section 2. Transition section 3 can be entirely composed of existing conventional uniform pipelines, or it can be entirely composed of a metamaterial base ring.

[0059] refer to Figure 9 In this embodiment, the sound transmission loss curve of the pipeline silencer system is based on... Figure 9 It can be seen that in the low-frequency broadband range of 0-1500Hz, compared with traditional structures and traditional damping and vibration reduction pipeline systems, its sound transmission loss amplitude can reach up to 50.2dB, with an average improvement of 18.4dB, achieving a high-efficiency sound wave attenuation effect in the low-frequency broadband.

[0060] Example 2

[0061] like Figure 10The diagram illustrates a novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system disclosed in this embodiment. Its implementation is essentially the same as in Embodiment 1, except that the pipeline silencer system in this embodiment has multiple expansion sections 1, and a base section 2 is provided between every two adjacent expansion sections 1, thereby enhancing the sound wave scattering effect and improving the silencer efficiency. The inner diameter, outer diameter, and axial length of each expansion section 1 are identical, and the inner diameter and outer diameter of each base section 2 can also be identical.

[0062] Example 3

[0063] like Figure 11 The diagram shows a novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system disclosed in this embodiment. Its implementation method is basically the same as that of Embodiment 2, except that the inner diameter, outer diameter, and axial length of each expansion section 1 are different, and the inner diameter and outer diameter of each base section 2 can also be set differently. For example... Figure 10 It has two expansion sections 1, with inner diameters of 170mm and 210mm respectively, and axial lengths of 140mm and 280mm respectively.

[0064] Example 4

[0065] This embodiment discloses a novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system. Its implementation method is basically the same as that of Embodiments 1, 2, or 3, except that in Embodiments 1, 2, and 3, the expansion section 1, transition section 3, and base section 2 are all circular tube structures, while in this embodiment, the expansion section 1, transition section 3, and base section 2 are all square tube structures. For example... Figure 12 As shown.

[0066] Example 5

[0067] This embodiment discloses a novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system. Its implementation is basically the same as that of Embodiments 1, 2, 3, or 4, except that: based on Embodiments 1, 2, 3, or 4, this embodiment has a functional layer 6 laid on the outer and / or inner wall of the expansion section 1 for vibration reduction, sound absorption, and / or heat insulation, for example... Figure 13 As shown. The material of functional layer 6 can be damping material, sound-absorbing cotton, or aluminum foam.

[0068] 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 novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system, characterized in that, This includes the expansion section, foundation section, and transition section of the pipeline structure; The expansion section is connected to the base section at both ends via the transition section, and the inner diameter of the expansion section is larger than the outer diameter of the base section. The expansion section includes at least one annular metamaterial base ring. When there are two or more metamaterial base rings on the expansion section, each metamaterial base ring is connected sequentially along the axial direction. The metamaterial base ring includes several anisotropic metashell units connected sequentially along the circumferential direction. Each anisotropic metashell unit includes a rigid support frame and a flexible support material. Its mechanical properties are determined or provided by the rigid support frame. The flexible design of the rigid support frame allows the pipeline silencer system to exhibit completely different static / dynamic characteristics, making it more flexible in static and dynamic characteristic design and meeting the silencer design requirements under different working conditions. The rigid support frame has at least one hole, and the rigid support frames of two adjacent anisotropic metashell units are connected. The flexible support material fills the hole of the rigid support frame and the space between two adjacent rigid support frames. The flexible support material covers the rigid support frame on the outer wall portion of the expansion section; and / or the flexible support material covers the rigid support frame on the inner wall portion of the expansion section.

2. The novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system according to claim 1, characterized in that, The inner diameter of the expansion section is at least 1.1 times the outer diameter of the base section.

3. The novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system according to claim 1, characterized in that, The elastic modulus of the material used in the rigid support frame is at least one order of magnitude higher than that of the flexible support material.

4. The novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system according to claim 1, characterized in that, The flexible support material is made of a single material, or the flexible support material is made of a mixture of two or more materials.

5. The novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system according to claim 1, characterized in that, The outer and / or inner walls of the expansion section are covered with functional layers for vibration reduction, sound absorption and / or heat insulation.

6. The novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system according to any one of claims 1 to 5, characterized in that, The base section consists of uniform pipelines; or The base section is a metamaterial conduit, and the metamaterial conduit includes at least one metamaterial base ring in the axial direction; or One part of the base section consists of uniform pipelines, and the other part consists of metamaterial pipelines, with the uniform pipelines and metamaterial pipelines being distributed alternately.

7. The novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system according to any one of claims 1 to 5, characterized in that, The transition section consists of uniform pipelines; or The transition section is a metamaterial conduit, and the metamaterial conduit includes at least one metamaterial base ring in the axial direction; or The transition section consists of a uniform pipeline and a metamaterial pipeline, with the uniform pipeline and the metamaterial pipeline being distributed alternately.

8. The novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system according to any one of claims 1 to 5, characterized in that, The number of expansion segments is multiple, and there is a base segment between two adjacent expansion segments; The inner diameters of each expansion segment may be the same or different, the outer diameters of each expansion segment may be the same or different, and the axial lengths of each expansion segment may be the same or different. The inner diameters of each of the aforementioned base segments may be the same or different, the outer diameters of each of the aforementioned base segments may be the same or different, and the axial lengths of each of the aforementioned base segments may be the same or different.

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