Novel light pressure-resistant multifunctional metamaterial pipeline silencer system

Abstract

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

Description

Technical Field

[0001] The present invention relates to the field of new materials and new technologies for pipeline noise control, and specifically to a novel lightweight, pressure-resistant, multifunctional metamaterial pipeline muffler system, which is expected to be applied to the noise control field of infusion pipeline systems in the fields of modern chemical industry, ships, aerospace, ocean and nuclear industries. Background Art

[0002] Infusion pipeline systems are widely used in industries such as industry, ships, aerospace, ocean and nuclear industries. They are mainly used to carry fluids to transfer energy, momentum and mass. They are widely used in ships, aircraft, rockets, rail transit and other equipment. The flow of fluid in the pipeline system will generate pressure wave pulsation, which can easily couple with the vibration of the pipe wall structure, thereby generating strong noise.

[0003] The noise of seawater pipeline system can be mainly divided into pipe wall structure vibration noise and pipe fluid noise. Among them, the pipe flow noise has the greatest impact in the total radiation noise of the pipe mouth. Its propagation in the fluid medium in the pipe has little attenuation and a long propagation distance. The basic way to control the noise of seawater pipeline system is generally to start with the control of noise source and noise propagation path. For flow noise control, noise source control is often designed and adopted by low-noise pumps, low-noise valves, etc. However, due to the structural characteristics of the centrifugal pump itself and the functional characteristics of control components such as valves, it can often only be reduced to a certain extent and cannot be completely eliminated. In addition, the working conditions of machinery, ships, etc. are changeable, and the noise caused by the sudden opening and closing of pumps and valves is difficult to avoid. It becomes very feasible to control the flow noise on the propagation path. The most common measure is to install a silencer unit. However, the existing pipeline silencers either have too narrow low-frequency silencing bands (e.g., although the resonance silencer can attenuate and suppress the convective noise in a lower frequency band, its silencing band is narrow), or have too high silencing frequencies (e.g., although the expansion silencer has a significant silencing effect in the middle and high frequencies, its low-frequency silencing effect is limited by space constraints and the effect is limited), and it is still difficult to meet the low-frequency broadband control requirements of the seawater pipeline system noise. In addition, with the rapid development of aerospace, ocean navigation and other fields, fluid power technology is developing towards high pressure, light weight, large flow and high power. Therefore, the need to develop a new multifunctional pipeline noise control system is very urgent. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned prior art, the present invention provides a new lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer 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 the low-frequency, broadband silencer system of the pipeline system in the 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 that are widely used in major fields such as aviation and marine engineering, mechanical engineering, etc.

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

[0006] Both ends of the expansion section are connected to the base section through the transition section respectively, and the inner diameter of the expansion section is greater than the outer diameter of the base section;

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

[0008] The metamaterial base ring includes a plurality of anisotropic supershell units sequentially connected along the ring direction, and the anisotropic supershell units include a rigid support skeleton and a flexible support material;

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

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

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

[0012] In one embodiment, the flexible supporting material is made of a single material, or the flexible supporting 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 at the inner wall portion of the expansion section.

[0015] In one embodiment, a functional layer is laid on the outer wall and / or inner wall of the expansion section for vibration reduction, sound absorption and / or heat insulation.

[0016] In one embodiment, the base section is composed of a uniform pipeline; or

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

[0018] A part of the base section is a uniform pipeline, and another part is a metamaterial pipeline, and the uniform pipeline and the metamaterial pipeline are distributed alternately.

[0019] In one embodiment, the transition section is composed of a uniform pipeline; or

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

[0021] A portion of the transition section is a uniform pipeline, and another portion is a metamaterial pipeline, and the uniform pipeline and the metamaterial pipeline are distributed alternately.

[0022] In one embodiment, there are multiple expansion segments, and there is a base segment between two adjacent expansion segments;

[0023] The inner diameters of the expansion sections are the same or different, the outer diameters of the expansion sections are the same or different, and the axial lengths of the expansion sections are the same or different;

[0024] The inner diameters of the base segments are the same or different, the outer diameters of the base segments are the same or different, and the axial lengths of the base segments are the same or different.

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

[0026] 1. The anisotropic supershell unit of the pipeline silencer system in the present invention is composed of a rigid support skeleton and a flexible support material, and its mechanical properties can be determined or provided by the rigid support skeleton, and the flexible design of the rigid support skeleton can make the pipeline silencer system present completely different static / dynamic properties. For example, the pipeline silencer system is composed of a specially designed rigid skeleton and a flexible support material, which can show a "low stiffness" property in the axial direction and a "high stiffness" property in the radial and circumferential directions. Compared with the traditional pipeline silencer, the present invention is more flexible in the design of static and dynamic properties, and can meet the muffler design requirements under different working conditions;

[0027] 2. Although related research on traditional pipeline silencers has proposed certain solutions for noise control, 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 it is not suitable for complex application scenarios such as existing high-speed and heavy-load. The new pipeline silencer system designed by the present invention is based on the principle of resistive silencer and modal coupling mechanism. The sound waves in the medium undergo complex sound wave scattering at the sudden interface of the silencer, so that its sound energy is effectively reflected. In addition, the pipeline silencer system designed by the present invention can enhance the coupling effect between the medium in the pipeline and the pipe wall material (i.e., anisotropic supershell unit), thereby further enhancing the silencer effect of the pipeline system. Compared with traditional pipeline silencers, it can achieve efficient ultra-low frequency silencer effect at a smaller size, which provides a new design idea for the silencer design and noise control of the pipeline system.

[0028] 3. The pipe silencer system in the present invention has a simple overall structure, is easy to process and easy to modularly assemble and apply. At the same time, the structural design space is sufficient and the adjustable parameters 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0030] Figure 1 This is a schematic diagram of a first implementation of a pipeline muffler system in Example 1 of the present invention;

[0031] Figure 2 This is a schematic diagram of a second implementation of the pipeline muffler system in Example 1 of the present invention;

[0032] Figure 3 This is a schematic diagram of a first implementation of an anisotropic supershell element in Example 1 of the present invention;

[0033] Figure 4 It is a schematic diagram of a second implementation of the anisotropic supershell element in Example 1 of the present invention;

[0034] Figure 5 Schematic diagram of a third implementation of the anisotropic supershell element in Example 1 of the present invention;

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

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

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

[0038] Fig. 9 Schematic diagram of the sound transmission loss curve of the pipeline muffler system in Example 1 of the present invention;

[0039] Fig.10 A schematic diagram of an implementation of a pipeline muffler system in Example 2 of the present invention;

[0040] Fig.11 A schematic diagram of an implementation of a pipeline muffler system in Example 3 of the present invention;

[0041] Fig.12 A schematic diagram of an implementation of a pipeline muffler system in Example 4 of the present invention;

[0042] Fig.13 This is a schematic diagram of an implementation of the pipeline muffler system in Example 5 of the present invention.

[0043] Figure numbers: expansion section 1, base section 2, transition section 3, rigid support skeleton 4, flexible support material 5, functional layer 6.

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] 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 components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0047] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] 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 the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0050] Example 1

[0051] like Figure 1 , Figure 2 As shown, a novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system disclosed in this embodiment mainly includes an expansion section 1, a base section 2 and a transition section 3 of a pipeline structure. Both ends of the expansion section 1 are connected to the base section 2 through the transition sections 3, respectively. 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 diffusing the pressure wave, thereby achieving a silencer effect.

[0052] In this embodiment, the expansion section 1 includes at least one annular metamaterial base ring. When the number of metamaterial base rings on the expansion section 1 is more than two, the metamaterial base rings are connected in sequence along the axial direction, and on the same expansion section 1, the inner diameters of the metamaterial base rings can be the same or different, as long as the smallest inner diameter of the metamaterial base ring is greater than the outer diameter of the base section 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. Figure 3The metamaterial base ring includes a plurality of anisotropic metashell units connected in sequence along the annular direction. The anisotropic metashell unit includes a rigid support skeleton 4 and a flexible support material 5. The rigid support skeleton 4 has at least one hole. The rigid support skeletons 4 on two adjacent anisotropic metashell units in the annular direction and the axial direction are fixedly connected by integral molding, welding, bolt connection, adhesive connection, riveting or snap connection, and the flexible support material 5 is filled in the holes of the rigid support skeleton 4 and in the gap between two adjacent rigid support skeletons 4.

[0053] It is worth noting that although Figure 3 The rigid support skeleton 4 and the flexible support material 5 are flush with each other on the inner and outer surfaces of the anisotropic supershell unit, but in specific applications, they can also be used. Figure 4 In the structure shown, the flexible support material 5 completely covers the rigid support frame 4 on the inner surface of the anisotropic supershell unit, that is, 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 supershell unit, that is, 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 supershell unit, the flexible support material 5 completely covers the rigid support skeleton 4, that is, the flexible support material 5 covers the rigid support skeleton 4 on the outer and inner wall parts of the expansion section 1.

[0054] In this embodiment, the elastic modulus of the material used for the rigid support skeleton 4 is at least one order of magnitude higher than that of the flexible support material 5. For example, the material of the rigid support skeleton 4 can be steel, whose elastic modulus is 207GPa, and the material of the flexible support material 5 can be hard foam, whose elastic modulus is 62MPa. Specifically, the material of the rigid reinforced skeleton can be steel, iron, aluminum alloy, plastic, composite material, reinforced concrete or wood, etc., and the combination method can be one-piece molding, welding, bolt connection, adhesive connection, riveting or snap 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 a mixture of two or more materials, and the combination method can be adhesive connection, vulcanization and other processes.

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

[0056] In specific applications, the change of the micromechanical properties of the anisotropic supershell element can provide low stiffness in one or / and multiple directions and high stiffness in one or / and multiple directions for the macroscopic pipeline silencer system. In addition, the anisotropic supershell element can also tune the macroscopic Poisson's ratio of the pipeline silencer system, and the Poisson's ratio can be flexibly adjusted within the range of -1 to 1 according to actual needs. For example, the rigid support frame 4 is designed as Figure 4 When the structure is in the form of macroscopic Poisson's ratio, it is close to 0; the rigid support frame 4 is designed as Figure 6 In the 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 the form of, the macroscopic Poisson's ratio of the structure is much greater than 0.

[0057] In the specific implementation process, the base section 2 can be composed of an existing conventional uniform pipeline. Alternatively, the base section 2 can be composed of a metamaterial pipeline. The structure of the metamaterial pipeline is basically the same as that of the expansion section 1, and is also composed of at least one metamaterial base ring. The only difference is that the inner and outer diameters are different from those of the expansion section 1. For example, Figure 1 As shown; Figure 1 or a part of the base section 2 is a uniform pipeline, and the other part is a metamaterial pipeline, and the uniform pipeline and the metamaterial pipeline are staggered, for example Figure 2 shown.

[0058] In the specific implementation process, the transition section 3 can be set as an equal straight ring structure, that is, the outer diameter of the transition section 3 is the same as the outer diameter of the expansion section 1, and the inner diameter of the transition section 3 is the same as the inner diameter of the base section 2. Or the transition section 3 is a conical structure with equal outer diameters and equal contraction, that is, the end of the transition section 3 with larger inner and outer diameters is butt-connected to the expansion section 1, and the end of the transition section 3 with smaller inner and outer diameters is butt-connected to the base section 2. Among them, the transition section 3 can be composed of an existing traditional uniform pipeline as a whole, or it can be composed of a metamaterial base ring as a whole.

[0059] refer to Fig. 9 The sound transmission loss curve of the pipeline muffler system in this embodiment is as follows: Fig. 9 It can be seen that in the low-frequency broadband range of 0-1500Hz, compared with the traditional structure and traditional damping and vibration reduction piping system, the amplitude of its sound transmission loss can reach up to 50.2dB, an average increase of 18.4dB, achieving a low-frequency broadband and efficient sound wave attenuation effect.

[0060] Example 2

[0061] like Fig.10The figure shows a novel lightweight, pressure-resistant, multifunctional metamaterial pipeline silencer system disclosed in this embodiment, and its implementation is basically the same as that of embodiment 1, except that: the pipeline silencer system in this embodiment has multiple expansion sections 1, and there is a base section 2 between each two adjacent expansion sections 1, thereby enhancing the sound wave scattering effect, thereby improving the noise reduction efficiency. Among them, the inner diameter, outer diameter and axial length of each expansion section 1 are respectively the same, and the inner diameter and outer diameter of each base section 2 can also be respectively the same.

[0062] Example 3

[0063] like Fig.11 The embodiment of the present invention discloses a novel lightweight, pressure-resistant, multifunctional metamaterial pipe muffler system, the implementation of which is basically the same as that of the 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 to be different. Fig.10 There are two expansion sections 1, the inner diameters of the two expansion sections 1 are 170 mm and 210 mm, and the axial lengths are 140 mm and 280 mm, respectively.

[0064] Example 4

[0065] This embodiment discloses a novel lightweight, pressure-resistant, multifunctional metamaterial pipeline muffler system, and its implementation is basically the same as that of Embodiment 1, Embodiment 2 or Embodiment 3, except that: in Embodiment 1, Embodiment 2 and Embodiment 3, the expansion section 1, transition section 3 and base section 2 are all circular tube structures, while the expansion section 1, transition section 3 and base section 2 in this embodiment are all square tube structures, for example Fig.12 shown.

[0066] Example 5

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

[0068] 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 changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A new type of lightweight, pressure-resistant, multifunctional metamaterial pipeline muffler system, characterized in that: It includes the expansion section, foundation section and transition section of the pipeline structure; Both ends of the expansion section are connected to the base section through the transition section respectively, and the inner diameter of the expansion section is greater than the outer diameter of the base section; The expansion section includes at least one metamaterial base ring of annular structure. When the number of the metamaterial base rings on the expansion section is more than two, the metamaterial base rings are sequentially connected along the axial direction. The metamaterial base ring includes a plurality of anisotropic supershell units sequentially connected along the ring direction, and the anisotropic supershell units include a rigid support skeleton and a flexible support material; The rigid support frame has at least one hole, the rigid support frames of two adjacent anisotropic supershell units are connected, and the flexible support material is filled in the hole of the rigid support frame and between two adjacent rigid support frames.

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

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

5. The novel lightweight, pressure-resistant, multifunctional metamaterial pipeline muffler system according to claim 1 is characterized in that: The flexible support material partially covers the rigid support frame on the outer wall of the expansion section; and / or The flexible support material covers the rigid support frame at the inner wall portion of the expansion section.

6. The novel lightweight, pressure-resistant, multifunctional metamaterial pipeline muffler system according to claim 1 is characterized in that: The outer wall and / or the inner wall of the expansion section is covered with a functional layer for vibration reduction, sound absorption and / or heat insulation.

7. The novel lightweight, pressure-resistant, multifunctional metamaterial pipeline muffler system according to any one of claims 1 to 5, characterized in that: The base section consists of uniform pipes; or The base section is a metamaterial pipeline, and the metamaterial pipeline includes at least one metamaterial base ring in the axial direction; or A part of the base section is a uniform pipeline, and another part is a metamaterial pipeline, and the uniform pipeline and the metamaterial pipeline are distributed alternately.

8. The novel lightweight, pressure-resistant, multifunctional metamaterial pipeline muffler system according to any one of claims 1 to 5, characterized in that: The transition section consists of a uniform pipeline; or The transition section is a metamaterial pipeline, and the metamaterial pipeline includes at least one metamaterial base ring in the axial direction; or A portion of the transition section is a uniform pipeline, and another portion is a metamaterial pipeline, and the uniform pipeline and the metamaterial pipeline are distributed alternately.

9. The novel lightweight, pressure-resistant, multifunctional metamaterial pipeline muffler system according to any one of claims 1 to 5, characterized in that: There are multiple expansion segments, and there is a base segment between two adjacent expansion segments; The inner diameters of the expansion sections are the same or different, the outer diameters of the expansion sections are the same or different, and the axial lengths of the expansion sections are the same or different; The inner diameters of the base segments are the same or different, the outer diameters of the base segments are the same or different, and the axial lengths of the base segments are the same or different.

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