High-efficiency preparation system and method of one-way constant-section full-frequency band sound absorption metamaterial structure

Abstract

The application discloses a one-way equal-section full-frequency band sound absorption metamaterial structure and a preparation method thereof. The one-way equal-section full-frequency band sound absorption metamaterial structure comprises a one-way equal-section acoustic porous body, a one-way equal-section acoustic shell and an acoustic plate. The preparation method comprises the following steps: one-way equal-section acoustic porous body forming; one-way equal-section acoustic shell forming; acoustic plate forming; assembling the one-way equal-section acoustic shell and the one-way equal-section acoustic porous body into a one-way equal-section acoustic unit body; and connecting the one-way equal-section acoustic unit body and the acoustic plate into the one-way equal-section full-frequency band sound absorption metamaterial structure. The one-way equal-section sound absorption metamaterial structure provided by the application can realize full-frequency band sound absorption; the one-way equal-section acoustic porous body and the one-way equal-section acoustic shell can be efficiently extruded and drawn to form, and the one-way equal-section sound absorption metamaterial structure can be efficiently prepared and quickly assembled, so that the one-way equal-section sound absorption metamaterial structure has the advantages of simple operation, low cost and high efficiency, and can be efficiently prepared in batches.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of new materials, new structure noise control and advanced manufacturing technology, in particular to a one-way equal cross-section full-band sound absorption metamaterial structure and a preparation method thereof. BACKGROUND

[0002] Acoustic metamaterials are new functional materials with super-normal sound wave / elastic wave regulation and control capabilities, which have unique advantages in vibration and noise reduction, ultrasonic imaging and detection, sound signal transmission and energy conversion, etc. Sound absorption metamaterials, as a prominent type of acoustic metamaterials, have a very promising engineering application prospect.

[0003] Typical sound absorption acoustic metamaterials mainly include thin film type sound absorption metamaterial structures, thin plate type sound absorption metamaterial structures, folded cavity type sound absorption metamaterial structures, Helmholtz resonance type sound absorption metamaterial structures, and composite structure combination type sound absorption metamaterial structures. These sound absorption metamaterial structures have excellent sound absorption capacity at low frequencies, but their configurations are relatively complex, usually requiring the use of 3D printing technology for preparation, and they face severe challenges in traditional process preparation, high production cost, and batch manufacturing difficulties in engineering applications. At the same time, the complex configuration also makes the reliability and anti-interference ability weak, which is difficult to adapt to harsh engineering application environment. In addition, the sound absorption frequency band of these sound absorption metamaterial structures is usually narrow, and in order to broaden the sound absorption frequency band, parallel / series connection of different unit modules is often used, which will lead to a significant increase in the overall weight of the structure, increasing the cost. Therefore, it is urgent to solve the problems of traditional process preparation, high production cost, low production efficiency, and batch manufacturing difficulty of sound absorption metamaterial structures. SUMMARY

[0004] The purpose of the present application is to provide a one-way equal cross-section full-band sound absorption metamaterial structure and a preparation method thereof, which is simple in structure and easy to prepare, and can solve the problems of traditional process preparation, high production cost, low production efficiency, and batch manufacturing difficulty of sound absorption metamaterial structures.

[0005] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0006] A one-way equal cross-section full-band sound absorption metamaterial structure, comprising: a one-way equal cross-section acoustic unit body and an acoustic plate, the one-way equal cross-section acoustic unit body comprising a one-way equal cross-section acoustic porous body and a one-way equal cross-section acoustic shell, the one-way equal cross-section acoustic porous body being placed in the one-way equal cross-section acoustic shell, and the acoustic plate comprising a high-rigidity sound insulation plate.

[0007] Further, the acoustic plate further comprises a sound transmission plate, the sound transmission plate being an open hole plate, an open slit plate, or an open hole and open slit combination plate, and the sound transmission plate being arranged above the one-way equal cross-section acoustic unit body.

[0008] Further, the high-rigidity sound insulation plate is connected with the two end faces of the one-way equal cross-section acoustic unit body in parallel to the one-way equal cross-section direction.

[0009] Further, the one-way equal cross-section acoustic porous body is provided with a slit, and the one-way equal cross-section acoustic porous body is equal in cross section perpendicular to the y-axis direction.

[0010] The application further discloses a preparation method of the one-way equal cross-section full-frequency-band sound absorption metamaterial structure.

[0011] The preparation of the structure includes: one-way equal cross-section acoustic porous body forming, one-way equal cross-section acoustic shell forming and acoustic plate forming.

[0012] The assembly of the structure includes: assembling the one-way equal cross-section acoustic shell and the one-way equal cross-section acoustic porous body into the one-way equal cross-section acoustic unit body; and connecting the one-way equal cross-section acoustic unit body and the acoustic plate into the one-way equal cross-section full-frequency-band sound absorption metamaterial structure.

[0013] Further, the one-way equal cross-section acoustic porous body forming includes:

[0014] The one-way equal cross-section acoustic porous body raw material block is cut into shape, or is injection molded in a mold or is press molded in a mold, so as to quickly obtain the one-way equal cross-section acoustic porous body.

[0015] Further, the injection molding in the mold specifically includes: manufacturing a mold for injection molding of the one-way equal cross-section acoustic porous body according to the configuration and size of the designed one-way equal cross-section acoustic porous body, injecting the one-way equal cross-section acoustic porous body raw material into the mold, and forming the one-way equal cross-section acoustic porous body through foaming.

[0016] The press molding in the mold specifically includes: manufacturing a mold for press molding of the one-way equal cross-section acoustic porous body according to the configuration and size of the designed one-way equal cross-section acoustic porous body, putting the one-way equal cross-section acoustic porous body raw material into the mold, and forming the one-way equal cross-section acoustic porous body through pressing.

[0017] Further, the one-way equal cross-section acoustic shell forming includes:

[0018] The one-way equal cross-section acoustic shell raw material is extrusion molded, or is injection molded, or is sheet metal formed, so as to quickly obtain the one-way equal cross-section acoustic shell.

[0019] Further, the one-way equal-section acoustic shell is formed by extrusion drawing of raw materials, specifically comprising: manufacturing an extrusion drawing mold for the one-way equal-section acoustic shell according to the configuration and size of the designed one-way equal-section acoustic shell, and forming the one-way equal-section acoustic shell through the extrusion drawing mold.

[0020] The one-way equal-section acoustic shell is formed by injection molding of raw materials, specifically comprising: manufacturing a mold for injection molding of the one-way equal-section acoustic shell according to the configuration and size of the designed one-way equal-section acoustic shell, and forming the one-way equal-section acoustic shell through the mold.

[0021] Further, the one-way equal-section acoustic porous body is pushed into the one-way equal-section acoustic shell along the y-axis direction.

[0022] According to the specific embodiments provided by the present application, the following technical effects are disclosed: compared with other acoustic superstructures, the one-way equal-section full-frequency sound absorption metamaterial structure provided by the present application has simple internal structure, regular external contour, easy assembly, easy access to raw materials, can realize full-frequency sound absorption, can be prepared by traditional process, and is convenient for large-area use in engineering.

[0023] The preparation method of the one-way equal-section full-frequency sound absorption metamaterial structure provided by the present application adopts efficient cutting forming, injection molding or pressing forming, which can quickly obtain the one-way equal-section acoustic porous body structure; adopts efficient extrusion drawing, injection molding or sheet metal forming, which can quickly obtain the one-way equal-section acoustic shell; and the one-way equal-section acoustic porous body, the one-way equal-section acoustic shell and the acoustic plate can be easily and efficiently assembled into the one-way equal-section full-frequency sound absorption metamaterial structure through simple and fast process assembly. The efficient preparation method of the one-way equal-section full-frequency sound absorption metamaterial structure solves the problems of difficult preparation by traditional process, high production cost, low production efficiency, difficult batch manufacturing and inability to large-scale use in engineering applications. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 It is a schematic diagram of the overall structure of the one-way equal-section full-frequency sound absorption metamaterial structure of the present application.

[0026] Figure 2 It is a schematic diagram of the exploded structure of the one-way equal-section full-frequency sound absorption metamaterial structure of the present application.

[0027] Figure 3A schematic view of an embodiment of the one-way equal cross-section acoustic unit body of the present application;

[0028] Figure 4 A schematic view of an embodiment of the one-way equal cross-section acoustic porous body of the present application;

[0029] Figure 5 A schematic view of another embodiment of the one-way equal cross-section acoustic porous body of the present application;

[0030] Figure 6 A flow chart of the preparation method of the one-way equal cross-section full-band sound absorption metamaterial structure of the present application;

[0031] Figure 7 A flow chart of the preparation method of the one-way equal cross-section full-band sound absorption metamaterial structure of the embodiment one of the present application;

[0032] Figure 8 A flow chart of the preparation method of the one-way equal cross-section full-band sound absorption metamaterial structure of the embodiment two of the present application;

[0033] Figure 9 A flow chart of the preparation method of the one-way equal cross-section full-band sound absorption metamaterial structure of the embodiment three of the present application;

[0034] The reference signs are explained as follows: 1-one-way equal cross-section acoustic porous body; 2-one-way equal cross-section acoustic shell; 3-acoustic plate; 4-one-way equal cross-section acoustic unit body; 31-sound-transparent plate; 32-high-rigidity sound-insulation plate; 5-one-way equal cross-section full-band sound absorption metamaterial structure; x-coordinate axis x; y-coordinate axis y; z-coordinate axis z. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0036] It should be noted that all directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directionality indications also change accordingly.

[0037] In addition, the descriptions such as "first", "second" and the like in the present application are only for the purpose of description and cannot be understood as indicating or implying the relative importance of the technical features indicated or implying the number of technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0038] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection, or physical connection or wireless communication connection; can be directly connected, or indirectly connected through intermediate medium, can be internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0040] The purpose of the present application is to provide a one-way equal cross-section full-band sound absorption metamaterial structure and a preparation method thereof, which simplifies the structure, reduces the preparation difficulty and production cost, improves the production efficiency, and facilitates mass production.

[0041] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0042] As shown in Figures 1 to 5 The one-way equal cross-section full-band sound absorption metamaterial structure provided by the present application comprises: a one-way equal cross-section acoustic unit body 4 and an acoustic plate 3, the one-way equal cross-section acoustic unit body 4 comprises a one-way equal cross-section acoustic porous body 1 and a one-way equal cross-section acoustic shell 2, the one-way equal cross-section acoustic porous body 1 is placed in the one-way equal cross-section acoustic shell 2, and the acoustic plate 3 comprises a high-rigidity sound insulation plate 32 and a sound transmission plate 31.

[0043] The sound-permeable plate 31 is a perforated plate, a slotted plate, or a combination of perforated and slotted plates, and is positioned above the unidirectional constant cross-section acoustic unit 4. Sound waves are incident from above the unidirectional constant cross-section full-frequency sound-absorbing metamaterial structure 5 into the structure, causing resonance. Finally, the sound waves are absorbed by the structure, achieving a full-frequency sound absorption and noise reduction effect.

[0044] In a preferred embodiment, the opening ratio of the sound-permeable plate 31 is 30%, 36%, 40%, or 62%.

[0045] The high-rigidity sound insulation panel 32 is connected to the two end faces of the unidirectional constant cross-section acoustic unit 4 parallel to the unidirectional constant cross-section direction. The connection method can be gluing, welding, riveting, bolting, snap-fitting, or wedging. The high-rigidity sound insulation panel 32 and the unidirectional constant cross-section acoustic unit 4 are tightly fitted together.

[0046] The high-rigidity sound insulation board 32 is preferably square in shape and preferably made of steel.

[0047] In a preferred embodiment, at least four bolt holes are provided on the high-rigidity sound insulation board 32, preferably twelve bolt holes, and one bolt hole is provided at each of the four vertices of the high-rigidity sound insulation board 32, while the other bolt holes are evenly distributed on the four sides of the high-rigidity sound insulation board 32.

[0048] In a preferred embodiment, at least four snap-fit ​​connections are provided on the high-rigidity sound insulation board 32, preferably eight snap-fit ​​connections, and the eight snap-fit ​​connections are evenly distributed on the four sides of the high-rigidity sound insulation board 32.

[0049] The unidirectional constant cross-section acoustic porous body 1 has a slit, and the cross-section of the unidirectional constant cross-section acoustic porous body 1 is the same everywhere along the direction perpendicular to the y-axis. The slit can be square, triangular, elliptical, rhomboid, or trapezoidal. The unidirectional constant cross-section acoustic porous body 1 is pushed into the unidirectional constant cross-section acoustic shell 2 along the y-axis direction.

[0050] The unidirectional constant cross-section acoustic unit 4 can be type I, L, U, J, or a combination thereof (see [reference]). Figures 2-3 ).

[0051] In a preferred embodiment, the unidirectional constant cross-section acoustic porous body 1 is I-shaped, with a slit on it having an isosceles trapezoidal cross-section (see reference). Figure 4 ).

[0052] In a preferred embodiment, the unidirectional constant cross-section acoustic porous body 1 is L-shaped, with a slit on it having a cross-section of an isosceles trapezoid or rectangle (see reference). Figure 5 ).

[0053] The unidirectional equal cross-section full-frequency sound-absorbing metamaterial structure 5 has a docking device on its side, which can connect multiple unidirectional equal cross-section full-frequency sound-absorbing metamaterial structures 5 in parallel to form a whole for area utilization.

[0054] like Figure 6 As shown, this invention also discloses a method for preparing a unidirectional, uniform cross-section, full-frequency sound-absorbing metamaterial structure, used to prepare the aforementioned unidirectional, uniform cross-section, full-frequency sound-absorbing metamaterial structure, comprising the following steps:

[0055] Step S1, fabricating structural components, including:

[0056] Step S1.1: Forming of unidirectional constant cross-section acoustic porous body 1;

[0057] Step S1.2: The unidirectional constant cross-section acoustic shell 2 is formed;

[0058] Step S1.3, acoustic board 3 is formed;

[0059] Assembled structural components:

[0060] Step S2: Assemble the unidirectional constant cross-section acoustic shell 2 and the unidirectional constant cross-section acoustic porous body 1 into a unidirectional constant cross-section acoustic unit body 4;

[0061] Step S3: The unidirectional equal cross-section acoustic unit 4 is connected to the acoustic plate 3 to form a unidirectional equal cross-section full-frequency sound-absorbing metamaterial structure 5.

[0062] Step S2 is located after steps S1.1 and S1.2, and step S3 is located after steps S1.3 and S2.

[0063] Further, step S1.1 can be S1.1.1 cutting the raw material block of the unidirectional equal cross-section acoustic porous body 1 into shape, or S1.1.2 injection molding in a mold, or S1.1.3 pressing molding in a mold to quickly obtain the unidirectional equal cross-section acoustic porous body 1.

[0064] Step S1.1, S1.1.1 The raw material block of the unidirectional constant cross-section acoustic porous body 1 is cut and shaped, specifically including: according to the shape of the unidirectional constant cross-section acoustic porous body 1, defining multiple first cutting lines (l1, l2, l3, ..., l) on the raw material block of the unidirectional constant cross-section acoustic porous body 1. n ) and the second cutting line (h1, h2, h3, ..., h n The distance between the first cutting line and the second cutting line corresponding to the coordinates is d. The second cutting line is the shape line of the actual unidirectional constant cross-section acoustic porous body 1. The raw material block of the unidirectional constant cross-section acoustic porous body 1 is fixed, and the shape of the raw material block of the unidirectional constant cross-section acoustic porous body 1 is roughly cut along the first cutting line (l1) to obtain the coarse cut body l of the cut unidirectional constant cross-section acoustic porous body 1.a1 Coarse cutting of the single-directional equal cross-section acoustic porous body 1 a1 Fixing, coarse cutting of the single-directional equal cross-section acoustic porous body 1 along the first cutting line (l2) a1 Fine cutting of the single-directional equal cross-section acoustic porous body 1 a2 Coarse cutting of the single-directional equal cross-section acoustic porous body 1 a2 Fixing, repeating the operation until the first cutting line is completely cut, to obtain the coarse cutting body l of the single-directional equal cross-section acoustic porous body 1 an Coarse cutting of the single-directional equal cross-section acoustic porous body 1 an Fixing, fine cutting of the single-directional equal cross-section acoustic porous body 1 along the second cutting line (h1) an Fine cutting of the single-directional equal cross-section acoustic porous body 1 b1 Fine cutting of the single-directional equal cross-section acoustic porous body 1 b1 Fixing, fine cutting of the single-directional equal cross-section acoustic porous body 1 along the second cutting line (h2) b1 Fine cutting of the single-directional equal cross-section acoustic porous body 1 b2 Fine cutting of the single-directional equal cross-section acoustic porous body 1 b2 Fixing, repeating the operation until the second cutting line is completely cut, to obtain the fine cutting body h of the single-directional equal cross-section acoustic porous body 1 bn Fine cutting of the single-directional equal cross-section acoustic porous body 1 bn Fixing, slitting cutting to form the single-directional equal cross-section acoustic porous body 1.

[0065] Step S1.1, S1.1.2 injection molding in the mold, specifically including: according to the material of the single-directional equal cross-section acoustic porous body 1, selecting an injection molding machine, according to the design of the single-directional equal cross-section acoustic porous body 1 configuration and size, manufacturing a mold for single-directional equal cross-section acoustic porous body 1 injection molding, injecting single-directional equal cross-section acoustic porous body 1 raw materials into the mold, forming a single-directional equal cross-section acoustic porous body 1 body through foaming, taking out the single-directional equal cross-section acoustic porous body 1 body after cooling, trimming the single-directional equal cross-section acoustic porous body 1 body, and finally forming the single-directional equal cross-section acoustic porous body 1.

[0066] Step S1.1, S1.1.3, pressing forming in a mold, specifically comprising: according to the configuration and size of the designed one-way constant cross-section acoustic porous body 1, manufacturing the mold cavity for one-way constant cross-section acoustic porous body 1 pressing forming and the mold head matched with the mold cavity, putting the one-way constant cross-section acoustic porous body 1 raw material into the mold cavity, pressing to form the one-way constant cross-section acoustic porous body 1 forming body through the mold head, polishing and edging treatment of the one-way constant cross-section acoustic porous body 1 forming body, and obtaining the one-way constant cross-section acoustic porous body 1.

[0067] Step S1.2, S1.2.1, extrusion drawing forming of the one-way constant cross-section acoustic shell 2 raw material, or S1.2.2, injection molding of the one-way constant cross-section acoustic shell 2 raw material, or S1.2.3, sheet metal forming of the one-way constant cross-section acoustic shell 2 raw material, quickly obtaining the one-way constant cross-section acoustic shell 2.

[0068] Step S1.2, S1.2.1, extrusion drawing forming of the one-way constant cross-section acoustic shell 2 raw material, specifically comprising: according to the configuration and size of the designed one-way constant cross-section acoustic shell 2, manufacturing the mold for one-way constant cross-section acoustic shell 2 extrusion drawing forming, preheating the mold, and when the mold reaches the predetermined temperature, putting the one-way constant cross-section acoustic shell 2 raw material into the mold, and when the one-way constant cross-section acoustic shell 2 raw material is heated to the predetermined temperature, forming the one-way constant cross-section acoustic shell 2 extrusion body by drawing machine once, and after the one-way constant cross-section acoustic shell 2 extrusion body is naturally cooled, removing burrs, polishing and edging treatment, and finally forming the one-way constant cross-section acoustic shell 2.

[0069] Step S1.2, S1.2.2, injection molding of the one-way constant cross-section acoustic shell 2 raw material, specifically comprising: according to the material of the one-way constant cross-section acoustic shell 2, selecting the injection molding machine, according to the configuration and size of the designed one-way constant cross-section acoustic shell 2, manufacturing the mold for one-way constant cross-section acoustic shell 2 injection molding, forming the one-way constant cross-section acoustic shell 2 forming body by mold injection, taking out the one-way constant cross-section acoustic shell 2 forming body after cooling, and removing burrs, polishing and edging treatment of the one-way constant cross-section acoustic shell 2 forming body, and finally forming the one-way constant cross-section acoustic shell 2.

[0070] Step S1.2, S1.2.3, sheet metal forming of the one-way constant cross-section acoustic shell 2 raw material, specifically comprising: the one-way constant cross-section acoustic shell 2 is of the same thickness, according to the configuration and size of the designed one-way constant cross-section acoustic shell 2, cutting the one-way constant cross-section acoustic shell 2 raw material to obtain the one-way constant cross-section acoustic shell 2 cutting body, stamping the one-way constant cross-section acoustic shell 2 cutting body to obtain the one-way constant cross-section acoustic shell 2 stamping body, then folding or rolling the one-way constant cross-section acoustic shell 2 stamping body to obtain the one-way constant cross-section acoustic shell 2 forming body, and finally removing the burrs of the one-way constant cross-section acoustic shell 2 forming body to finally form the one-way constant cross-section acoustic shell 2.

[0071] Embodiment one, a flow chart of a high-efficiency preparation method of a one-way equal-section full-band sound-absorbing metamaterial structure 5 is shown in Figure 7 , comprising:

[0072] Step S1.1.1, a one-way equal-section acoustic porous body 1 raw material block is cut and formed to obtain a one-way equal-section acoustic porous body 1;

[0073] Step S1.2.1, a one-way equal-section acoustic shell 2 raw material is extruded and formed to obtain a one-way equal-section acoustic shell 2;

[0074] Step S1.3, an acoustic plate 3 is formed;

[0075] Step S2, the one-way equal-section acoustic shell 2 and the one-way equal-section acoustic porous body 1 are assembled into a one-way equal-section acoustic unit body 4;

[0076] Step S3, the one-way equal-section acoustic unit body 4 is connected with the acoustic plate 3 to form a one-way equal-section full-band sound-absorbing metamaterial structure 5.

[0077] Embodiment two, a flow chart of another high-efficiency preparation method of a one-way equal-section full-band sound-absorbing metamaterial structure 5 is shown in Figure 8 , comprising:

[0078] Step S1.1.2, injection molding is performed in a mold to obtain a one-way equal-section acoustic porous body 1;

[0079] Step S1.2.2, a one-way equal-section acoustic shell 2 raw material is injection molded to obtain a one-way equal-section acoustic shell 2;

[0080] Step S1.3, an acoustic plate 3 is formed;

[0081] Step S2, the one-way equal-section acoustic shell 2 and the one-way equal-section acoustic porous body 1 are assembled into a one-way equal-section acoustic unit body 4;

[0082] Step S3, the one-way equal-section acoustic unit body 4 is connected with the acoustic plate 3 to form a one-way equal-section full-band sound-absorbing metamaterial structure 5.

[0083] Embodiment three, a flow chart of another high-efficiency preparation method of a one-way equal-section full-band sound-absorbing metamaterial structure 5 is shown in Figure 9 , comprising:

[0084] Step S1.1.3, compression molding is performed in a mold to obtain a one-way equal-section acoustic porous body 1;

[0085] Step S1.2.1, a one-way equal-section acoustic shell 2 raw material is extruded and formed to obtain a one-way equal-section acoustic shell 2;

[0086] Step S1.3, forming the acoustic plate 3;

[0087] Step S2, assembling the one-way equal cross-section acoustic shell 2 and the one-way equal cross-section acoustic porous body 1 into the one-way equal cross-section acoustic unit body 4;

[0088] Step S3, connecting the one-way equal cross-section acoustic unit body 4 and the acoustic plate 3 into the one-way equal cross-section full-frequency sound absorption metamaterial structure 5.

[0089] The details of the present application are known.

[0090] Compared with other acoustic superstructures, the one-way equal cross-section sound absorption metamaterial structure provided by the present application can realize full-frequency sound absorption; in the preparation method provided by the present application, the one-way equal cross-section acoustic porous body and the one-way equal cross-section acoustic shell can be efficiently injection molded, extrusion drawn, etc., and the one-way equal cross-section sound absorption metamaterial structure can be efficiently prepared and quickly assembled; compared with other methods, the present method has the advantages of simple operation, low cost and high efficiency, and can realize efficient batch preparation.

[0091] The principles and implementation modes of the present application are described by applying specific examples in this paper, and the above examples are only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed. In summary, the content of the present application should not be understood as a limitation of the present application.

Claims

1. A method for preparing a one-way constant cross-section full-band sound absorption metamaterial structure, characterized in that, The one-way equal-section full-band sound absorption metamaterial structure comprises a one-way equal-section acoustic unit body (4) and an acoustic plate (3), the one-way equal-section acoustic unit body (4) comprises a one-way equal-section acoustic porous body (1) and a one-way equal-section acoustic shell (2), the one-way equal-section acoustic porous body (1) is arranged in the one-way equal-section acoustic shell (2), and the acoustic plate (3) comprises a high-rigidity sound insulation plate (32); The acoustic plate (3) further comprises a sound-transmitting plate (31), the sound-transmitting plate (31) is an open-hole plate, an open-slit plate or an open-hole and open-slit combined plate, and the sound-transmitting plate (31) is arranged above the one-way equal-section acoustic unit body (4); The one-way equal-section acoustic porous body (1) is provided with slits, and the one-way equal-section acoustic porous body (1) is equal in section along a direction perpendicular to the y-axis; The preparation method comprises the following steps: Preparation of a structural member, comprising: one-way equal-section acoustic porous body (1) forming, one-way equal-section acoustic shell (2) forming, and acoustic plate (3) forming; The one-way equal-section acoustic porous body (1) forming comprises: one-way equal-section acoustic porous body raw material block cutting forming, or injection molding in a mold, or compression molding in a mold, to quickly obtain the one-way equal-section acoustic porous body (1); the injection molding in the mold specifically comprises: according to the configuration and size of the designed one-way equal-section acoustic porous body, a mold for one-way equal-section acoustic porous body injection molding is manufactured, one-way equal-section acoustic porous body raw material is injected into the mold, and the one-way equal-section acoustic porous body (1) is formed by foaming; the compression molding in the mold specifically comprises: according to the configuration and size of the designed one-way equal-section acoustic porous body, a mold for one-way equal-section acoustic porous body compression molding is manufactured, one-way equal-section acoustic porous body raw material is put into the mold, and the one-way equal-section acoustic porous body (1) is formed by compression; The one-way equal-section acoustic shell (2) forming comprises: one-way equal-section acoustic shell raw material extrusion forming, or one-way equal-section acoustic shell raw material injection molding, or one-way equal-section acoustic shell raw material sheet metal forming, to quickly obtain the one-way equal-section acoustic shell (2); the one-way equal-section acoustic shell raw material extrusion forming specifically comprises: according to the configuration and size of the designed one-way equal-section acoustic shell, an extrusion forming mold for the one-way equal-section acoustic shell is manufactured, and the one-way equal-section acoustic shell (2) is formed by the extrusion forming mold; the one-way equal-section acoustic shell raw material injection molding specifically comprises: according to the configuration and size of the designed one-way equal-section acoustic shell, a mold for one-way equal-section acoustic shell injection molding is manufactured, and the one-way equal-section acoustic shell (2) is formed by injection molding through the mold; Assembling the structural member: the one-way equal-section acoustic shell (2) and the one-way equal-section acoustic porous body (1) are assembled into the one-way equal-section acoustic unit body (4); and the one-way equal-section acoustic unit body (4) and the acoustic plate (3) are connected into the one-way equal-section full-band sound absorption metamaterial structure.

2. The method of claim 1, wherein the method further comprises: The high-rigidity soundproof board (32) is connected with the two end faces of the unidirectional equal cross-section acoustic unit body (4) in parallel to the unidirectional equal cross-section direction.

3. The method of claim 1, wherein the method further comprises: The unidirectional equal cross-section acoustic porous body (1) is pushed into the unidirectional equal cross-section acoustic shell (2) along the y-axis direction.

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