A mortise-and-tenon acoustic metastructure unit module, an acoustic metastructure material assembly, and a preparation method thereof

Abstract

The present invention relates to a mortise-and-tenon acoustic metastructure unit module, an acoustic metastructure material assembly, and a method for preparing the same. The mortise-and-tenon acoustic metastructure unit module comprises a plug-in boss and a mortise-and-tenon end. The bottom end of the plug-in boss is connected to the top end of the mortise-and-tenon end. The interior of the plug-in boss and the interior of the mortise-and-tenon end are connected to form a sound-absorbing cavity. The plug-in boss is composed of a front sealing plate and a side sealing plate. One end of the side sealing plate is connected to the front sealing plate, and the other end of the side sealing plate is connected to the top end of the mortise-and-tenon end. An inner plug-in tube is provided in the plug-in boss, and the inner plug-in tube is connected to the front sealing plate. A sound-absorbing tube hole is provided at the location where the front sealing plate and the inner plug-in tube are connected. The mortise-and-tenon end is composed of a front plate and a side plate. One end of the front plate is connected to the side sealing plate, and the other end of the front plate is connected to the side plate. The side plates are provided with rotationally symmetrically distributed tenons and grooves. The mortise-and-tenon acoustic metastructure material assembly comprises a plurality of mortise-and-tenon acoustic metastructure unit modules. The mortise-and-tenon acoustic metastructure unit modules can be assembled into a large-scale, multi-stage acoustic metastructure material device.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic material applications, and in particular to a mortise-and-tenon acoustic metastructure unit module, an acoustic metastructure material assembly, and a preparation method thereof. Background Art

[0002] In recent years, numerous researchers have conducted extensive research on the sound absorption and insulation theory and low-frequency noise reduction mechanisms of acoustic metamaterials. Artificial intelligence methods have even been used to sequence and design these metamaterials, resulting in the design of numerous acoustic metamaterials with excellent low-frequency noise reduction performance. Multi-stage cavity acoustic metamaterials, which exhibit low-bandwidth sound absorption, have seen rapid development. Multi-stage cavity acoustic metamaterials contain multiple resonant absorbing units, each of which produces localized resonant energy dissipation for sound waves within a specific frequency range. The peak frequency and amplitude of their sound absorption coefficient are directly related to the structural parameters of each resonant unit, such as the volume of the resonant unit and the geometric parameters of the sound-absorbing tube holes. Numerous studies have demonstrated that by sequentially designing multiple metamaterial modules with different parameters in series, parallel, or both, and thereby promoting non-localized strong coupling energy dissipation among the multiple absorbing units, efficient absorption of low-frequency broadband noise can be achieved in large-scale multi-stage metamaterial assemblies. Therefore, multi-stage cavity-type acoustic metamaterial components with a certain periodicity have a wide range of practical application value, including serving in major equipment manufacturing fields such as construction, transportation, aerospace and navigation, and being used to construct meta-anechoic chambers / silent rooms, meta-ceiling panels / wall panels, meta-sound barriers, meta-sound insulation covers and meta-anechoic tiles, etc.

[0003] Current research on cavity-type acoustic metamaterials focuses primarily on their low-frequency noise reduction mechanisms, structural design, lightweight substrates, and molding processes. However, the assembly technology for large-scale acoustic metamaterial applications, such as splicing, assembly, and disassembly, is still less mature. To achieve low-bandwidth noise reduction through a multi-unit modular approach, current multi-cavity acoustic metamaterial devices are assembled using complex processes such as disassembly of unit modules, adhesive bonding, and laser or ultrasonic welding to create the combined metamaterial configuration. These methods suffer from low efficiency, high cost, prone to deformation, cracking, and sound leakage, poor precision, environmental impact, and difficulty in maintenance.

[0004] Chinese patent CN104831926A discloses a method for paving floor tiles with mortise and tenon joints, including preparation, marking elevation lines, floor leveling, self-leveling, marking lines, laying composite panels, caulking, and panel cleaning. The patent secures the mortise and tenon joint composite panels to the ground using countersunk holes, without affecting the joints between the composite tiles. Furthermore, the base plate comprises several mortise and tenon joint modules, which can be joined together using different sizes of mortise and tenon joint modules, depending on the size of the composite tiles. This increases flexibility and enables dry paving. Furthermore, the patent uses a quick-jointing structure between the modules, allowing small modules to be assembled into large modules, enabling rapid installation of finished products.

[0005] Chinese patent CN203821260U discloses a multi-purpose sound-absorbing and insulating module and a sound-absorbing and insulating wall or silencer assembled from the module. The multi-purpose sound-absorbing and insulating module comprises a sound-absorbing and insulating section, a connecting section and a sound-absorbing section which are sequentially connected to form a folded plate shape; the sound-absorbing and insulating section comprises two adjacent upper and lower layers, the upper layer of which is a sound-insulating material and the lower layer is a sound-absorbing material; the sound-insulating material is covered with a sound-insulating protective panel, and the sound-absorbing material is covered with a sound-absorbing protective panel; the connecting section and the sound-absorbing section both comprise a shell surrounded by sound-absorbing protective panels, and the shell is filled with sound-absorbing material. The sound-absorbing and insulating section of the sound-absorbing and insulating module having the above-mentioned structure has sound-absorbing and sound-insulating properties, and the sound-absorbing section plays a sound-absorbing role. The multi-purpose sound-absorbing and insulating wall or silencer described in this patent has a single structural feature, does not have artificial intelligence sequence design, and does not have customized frequency selection and band selection functionality. Summary of the Invention

[0006] The purpose of the present invention is to provide a mortise and tenon acoustic metastructure unit module, an acoustic metastructure material component and a preparation method thereof, and to design a lightweight mortise and tenon acoustic metastructure unit module with local resonance energy consumption characteristics. By lateral mortise and tenon joints and longitudinal plug-in joints of the metastructure local resonance unit module designed with intelligent sequence structure and capable of controlling multiple noise frequency bands, it can be assembled into a large-format and multi-stage acoustic metastructure material device, which can better achieve low-bandwidth noise reduction performance and assembly process requirements such as high modularity, high strength and zero carbon emissions, and has broad application prospects in the field of acoustic metastructure material preparation and assembly.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The first object of the present invention is to provide a mortise-and-tenon acoustic meta-unit module, comprising a plug-in boss and a mortise-and-tenon end, wherein the bottom end of the plug-in boss is connected to the top end of the mortise-and-tenon end, and the interior of the plug-in boss and the interior of the mortise-and-tenon end are connected to form a sound-absorbing cavity.

[0009] The plug-in boss is composed of a front sealing plate and a side sealing plate, one end of the side sealing plate is connected to the front sealing plate, and the other end of the side sealing plate is connected to the top end of the tenon joint.

[0010] An inner insert tube is provided in the plug-in boss, and the inner insert tube is connected to the front sealing plate. A sound absorbing tube hole is provided at the position where the front sealing plate and the inner insert tube are connected.

[0011] The mortise and tenon joint end is composed of a front plate and a side plate. One end of the front plate is connected to the side sealing plate, and the other end of the front plate is connected to the side plate. The side plate is provided with tenons and mortise grooves that are rotationally symmetrically distributed around it.

[0012] Furthermore, the axes of the plug-in boss and the tenon end are on the same straight line.

[0013] Furthermore, the front sealing plate and the side sealing plate of the plug-in boss are hollow inside to form an inner cavity of the plug-in boss, and the front plate and the side plate of the mortise end are hollow inside to form an inner cavity of the mortise end. The inner cavity of the plug-in boss and the inner cavity of the mortise end constitute a sound absorbing cavity.

[0014] Furthermore, the plug-in boss is a shell structure, the outer cross-section of the plug-in boss is square, including square or rectangular, and the length (y-direction) of the plug-in boss ranges from 1 / 3 to 1 of the length (y-direction) of the inner cavity of the tenon end;

[0015] The length of the plug-in boss ranges from 1 / 3 to 1 of the length of the inner cavity of the mortise end, which refers to the length in the y direction, and does not change in the x and z directions; at the same time, if the length of the inner cavity of the mortise end changes in the y direction (is lengthened or shortened), the cross-sectional dimensions of the tenon and mortise do not change, but only change with the lengthening or shortening.

[0016] Furthermore, the front edge of the plug-in boss is chamfered at a certain angle to facilitate plug-in.

[0017] Furthermore, the opening cross-section of the sound-absorbing pipe hole is square, circular or other shapes.

[0018] Furthermore, the sum of the length of the inner tube (in the y direction) and the length of the plug-in boss does not exceed the length of the sound absorption cavity (in the y direction) to ensure that the plug-in boss of the subsequent module can be fully inserted into the internal cavity of the mortise end of the previous module.

[0019] Furthermore, the dimensions of the outer cross-section of the side sealing plate of the plug-in boss are the same as the dimensions of the inner wall envelope cross-sections of the four symmetrically arranged mortise grooves, so that the plug-in boss does not rotate in the internal cavity of the mortise end;

[0020] A limiting rib is provided in the mortise end, and the length of the limiting rib (in the y direction) is the same as the length of the mortise (in the y direction).

[0021] Furthermore, the mortise and tenon end is a shell structure, and the four peripheral surfaces of the side plate of the mortise and tenon end are respectively provided with a group of tenons and tenon grooves in a dovetail configuration.

[0022] Furthermore, the outer configuration of the tenon is the same as the inner configuration of the tenon groove, and both the tenon and the tenon groove axially penetrate the front and rear sides of the tenon end side plate.

[0023] Furthermore, a sound insulation backboard is provided at the bottom of the mortise end, a backboard limiting boss is provided on the surface of the sound insulation backboard, the backboard limiting boss and the bottom of the mortise end form a sealing assembly, and the sound insulation backboard plays a sound insulation role.

[0024] A second object of the present invention is to provide a mortise-and-tenon acoustic metamaterial assembly, comprising a plurality of mortise-and-tenon acoustic metastructure unit modules, wherein the mortise-and-tenon acoustic metastructure unit modules can be assembled into a large-scale, multi-stage acoustic metamaterial device.

[0025] Furthermore, the mortise-and-tenon acoustic metamaterial assembly is a multi-stage acoustic metamodule assembly comprising a plurality of mortise-and-tenon acoustic metamodule units connected in series.

[0026] Several of the mortise-and-tenon acoustic meta-unit modules are arranged front and back in a longitudinal plug-in manner to broaden the sound absorption band, and the plug-in boss of the rear-stage module is inserted into the mortise-and-tenon end cavity of the front-stage module.

[0027] Furthermore, when the modules are longitudinally plugged in, the side sealing plates of the plug-in bosses of the rear-stage modules are connected to the inner walls of the mortise grooves and the top ends of the limiting ribs of the mortise ends of the front-stage modules.

[0028] Furthermore, when longitudinally plugged in, the side sealing plate of the plug-in boss of the rear-stage module and the inner wall of the mortise of the mortise end of the front-stage module form an interference fit to ensure that the plug-in boss of the rear-stage module does not rotate in the inner cavity of the mortise end.

[0029] Furthermore, when plugged in longitudinally, the sound insulation back panel is sealed and plugged into the bottom of the tenon joint end of the last-stage module.

[0030] Furthermore, the mortise-and-tenon acoustic metamaterial assembly is a large-scale acoustic metamodule assembly composed of several mortise-and-tenon acoustic metamodule units connected in parallel.

[0031] Several of the mortise-and-tenon acoustic meta-unit modules are adjacently arranged by transverse mortise-and-tenon connection to broaden the sound absorption band. Each of the mortise-and-tenon acoustic meta-unit modules is transversely mortise-and-tenon connected to each other through the tenons and grooves of adjacent modules.

[0032] Furthermore, in the case of transverse mortise and tenon connection, the tenons of the adjacent modules and the mortises of the adjacent modules form an interference fit.

[0033] Furthermore, when the mortise and tenon joints are performed laterally, the assembly modes of the end faces of the plug-in bosses of the mortise and tenon joints include flush and non-flush assembly modes, that is, mortise and tenon joints of several parameters of the acoustic meta-unit modules can be staggered in mortise and tenon joints in a non-coplanar manner to form a staggered decorative effect.

[0034] Furthermore, several of the mortise and tenon acoustic meta-unit modules can be designed into a horizontal multi-unit assembly component through non-local strong coupling integration, and assembled as a whole in a module fixing frame with the same tenon and mortise configuration as the four sides of the mortise and tenon acoustic meta-unit module.

[0035] Furthermore, the end face of the plug-in boss of the front stage of the mortise-and-tenon acoustic meta-unit module constitutes a sound-absorbing surface, facing the noise source, and the noise source is dissipated by a sound-absorbing cavity composed of several multi-stage series / parallel connections.

[0036] Furthermore, traditional sound-absorbing materials are provided in the gaps between the plug-in bosses of the frontmost level of several of the mortise-and-tenon acoustic meta-unit modules to achieve the absorption of both medium and high frequency noises.

[0037] Furthermore, a keel frame is provided in the gap between the plug-in bosses of the frontmost level of several of the mortise-and-tenon acoustic meta-structure unit modules, and the keel frame is used to realize the assembly of large-scale acoustic meta-structure devices in a hoisting application manner.

[0038] Furthermore, the lower end of the keel frame is provided with a traditional sound-absorbing material to absorb both medium and high frequency noise.

[0039] Furthermore, each of the mortise-jointed acoustic meta-unit modules allows for different lengths (in the y direction) of the mortise-jointed ends, different shapes and sizes of the cross-sections of the sound-absorbing tube holes, and different lengths of the inner insert tubes.

[0040] A third object of the present invention is to provide a method for preparing a mortise-and-tenon acoustic metamaterial assembly, the specific steps of which are as follows:

[0041] S1. Use intelligent optimization algorithms (differential evolution algorithms) to reverse-design jointed acoustic metamaterial components that meet noise reduction targets.

[0042] S2. Integrating the plug-in boss and the tenon joint end of the tenon-jointed acoustic meta-unit module using a preparation process;

[0043] S3. By connecting several of the mortise-and-tenon acoustic metastructure unit modules in series longitudinally (y-direction) and connecting several of the mortise-and-tenon acoustic metastructure unit modules in parallel transversely (x-direction and z-direction), a large-scale multi-stage mortise-and-tenon acoustic metastructure material assembly is formed in which multiple unit modules are connected in series, in parallel, or in series-parallel combination.

[0044] Furthermore, in step S1, the algorithm flow for reverse designing a jointed acoustic metamaterial component that meets the noise reduction target using an intelligent optimization algorithm is as follows:

[0045] S1-1. Set a noise reduction target value (e.g., the sound absorption coefficient or sound insulation within a specified frequency band is not less than a set value) and randomly generate N sets of structural parameters for mortise-and-tenon acoustic metamaterial components within the design requirements (e.g., the structural dimension limits for mortise-and-tenon acoustic metastructure modules).

[0046] S1-2. Perform differential evolution on the N groups of structural parameters of the mortise-and-tenon acoustic metamaterial assemblies to obtain M groups of structural parameters of the mortise-and-tenon acoustic metamaterial assemblies. Calculate and select the group of structural parameters of the mortise-and-tenon acoustic metamaterial assemblies that meets the design conditions (such as the thickness, size, and weight of the mortise-and-tenon acoustic metamaterial assemblies) and merge them with the N groups of structural parameters of the mortise-and-tenon acoustic metamaterial assemblies generated in the previous step.

[0047] S1-3. Calculate target values ​​for the merged structural parameter groups of the mortise-and-tenon acoustic metamaterial assembly, sort the structural parameter groups of the mortise-and-tenon acoustic metamaterial assembly according to the calculated target values ​​(in descending order from largest to smallest), and select the top N groups of structural parameters of the mortise-and-tenon acoustic metamaterial assembly;

[0048] S1-4. Finally, based on the number of iterations or the target threshold termination condition, determine whether the calculation termination condition is met. If so, select a set of structural parameters of the mortise-and-tenon acoustic metamaterial component with the optimal noise reduction target value as the optimization result of the mortise-and-tenon acoustic metamaterial component; if not, change the structural parameters of the mortise-and-tenon acoustic metamaterial component again, and repeat the above iterative calculation until the termination condition is met.

[0049] As a preferred technical solution, based on the resonant sound absorption theory of metastructured unit modules and the unit parallel impedance matching sound absorption theory, an expression is established to relate the sound absorption coefficient to the structural parameters of the metastructured material assembly (including the structural parameters of each unit module). Using the sound absorption coefficient as a noise reduction constraint (e.g., not less than a set value) and the structural parameters as the objective function, the structural parameter optimization design of the metastructured material assembly is achieved by inversely optimizing the objective function. In other words, the structural parameters of the metastructured material assembly are obtained in reverse (i.e., the precise geometric model data of the metastructured material assembly is obtained in reverse). For example, the thickness parameter within the structural parameters can be minimized and optimized. Based on this, a corresponding optimization design program can be designed based on the differential evolution algorithm.

[0050] Furthermore, the structural parameters of the mortise-and-tenon acoustic metamaterial assembly include structural parameters of each module in a plurality of mortise-and-tenon acoustic metaunit modules.

[0051] Furthermore, in step S2, the preparation process is selected from any one of 3D printing, injection molding or casting.

[0052] Furthermore, in step S2, the raw materials of the mortise and tenon acoustic meta-unit module include polymer composite materials and metal materials.

[0053] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0054] (1) The mortise-and-tenon acoustic meta-unit module of the present invention can implement diversified intelligent design of the meta-unit module by changing its structural parameters such as the length of the inner tube, the size of the tube hole and the thickness of the inner cavity of the mortise end, thereby realizing its customized frequency and band selection control of noise.

[0055] (2) The mortise-and-tenon acoustic meta-unit module of the present invention is a shell structure, which realizes the ultimate design of the sound-absorbing cavity and helps to enhance the low-frequency noise reduction characteristics; it can be formed by integrated molding such as 3D printing, injection molding, and casting, with a simple process and convenient for rapid and automated processing and preparation.

[0056] (3) The method for preparing the mortise-and-tenon acoustic metamaterial assembly proposed in the present invention can prepare a large-scale multi-stage acoustic metamaterial device by dry-jointing and mortising the metamaterial unit modules in the longitudinal and transverse directions. In addition, only one set of sound insulation backboards needs to be plugged and sealed at the bottom of the mortise-and-tenon end of the last-stage unit module, which requires less material and does not require a large number of nailing, fixing, and sealing measures. This preparation method is flexible and convenient, and can achieve low-bandwidth noise reduction performance (including sound absorption and sound insulation performance) while meeting assembly process requirements such as modularity, high strength, and zero carbon emissions, as well as convenient application requirements such as replacement, maintenance, and reuse. This method has broad application prospects in the preparation and assembly of low-bandwidth cavity-type acoustic metamaterials.

[0057] (4) The method for preparing the mortise-and-tenon acoustic metamaterial assembly proposed in this invention can be used in combination with traditional sound-absorbing materials to expand the noise reduction efficiency of high-frequency noise without increasing the thickness. In addition, several mortise-and-tenon acoustic metamaterial modules can be staggered and interlocked in a non-coplanar manner to create a staggered surface decorative effect.

[0058] (5) Compared with the existing patents, the present invention is not only embodied in the mortise and tenon joint in the transverse direction, but also can be plugged in the longitudinal direction, and can be used in a non-coplanar manner. The multi-purpose absorption partition wall or silencer proposed in CN203821260U has a single structural feature, does not have artificial intelligence sequence design, and does not have customized frequency selection and band selection functionality. The present invention proposes a super-structure unit module and its components with local resonance energy dissipation characteristics that are designed by artificial process. By changing the structural parameters such as the length of the inner tube, the size of the tube hole and the thickness of the inner cavity of the mortise end, the super-structure unit module can be implemented with diversified intelligent design. The component has multiple structural parameter characteristics and customized low-bandwidth noise reduction characteristics. Therefore, simply applying the splicing method in patent CN104831926A to patent CN203821260U cannot obtain the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 Schematic diagram of the three-dimensional structure of the mortise-and-tenon acoustic meta-unit module in Example 1 of the present invention;

[0060] Figure 2 Schematic diagram of a partial cross-section of the mortise-and-tenon acoustic meta-unit module in Example 1 of the present invention;

[0061] Figure 3 Schematic diagram of the bottom surface of the mortise-and-tenon acoustic meta-unit module in Example 1 of the present invention;

[0062] Figure 4 Schematic diagram of the longitudinal assembly of the mortise-and-tenon acoustic metamaterial assembly in Example 2 of the present invention;

[0063] Figure 5 Schematic diagram of the transverse assembly of the mortise-and-tenon acoustic metamaterial assembly in Example 3 of the present invention;

[0064] Figure 6 Schematic diagram of the vertical assembly of the mortise-and-tenon acoustic metamaterial assembly in Examples 4 and 5 of the present invention;

[0065] Figure 7 Schematic diagram of the suspended assembly of the mortise-and-tenon acoustic metamaterial assembly in Example 6 of the present invention;

[0066] Figure 8 This is a flow chart of the algorithm for the structural parameters of the mortise-and-tenon acoustic metamaterial assembly in Example 7 of the present invention.

[0067] Explanation of the accompanying figures: 1. Plug-in boss, 11. Sound-absorbing pipe hole, 12. Inner insert, 2. Mortise end, 21. Tenon, 22. Mortise, 23. Limiting rib, 3. Sound insulation backboard, 31. Backboard limiting boss, 4. Sound-absorbing cavity, 6. Traditional sound-absorbing material, 7. Module fixing frame, 8. Keel frame, 1-1. Plug-in boss of the previous module, 2-1. Mortise end of the previous module, 1-2. Plug-in boss of the next module, 2-2. Mortise end of the next module, 1-3. Plug-in boss of the last module, 2-3. Mortise end of the last module, 211. Tenon of the adjacent module, 221. Mortise of the adjacent module. DETAILED DESCRIPTION

[0068] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0069] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0070] In the description of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0071] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0072] In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0073] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0074] Example 1

[0075] See also Figures 1 to 3 This embodiment provides a mortise-jointed acoustic meta-unit module, comprising a plug-in boss 1 and a mortise end 2. The bottom end of the plug-in boss 1 is connected to the top end of the mortise end 2. The interior of the plug-in boss 1 and the interior of the mortise end 2 are connected to form a sound-absorbing cavity 4.

[0076] The plug-in boss 1 is composed of a front sealing plate and a side sealing plate. One end of the side sealing plate is connected to the front sealing plate, and the other end of the side sealing plate is connected to the top of the tenon end 2.

[0077] An inner insert tube 12 is provided in the plug-in boss 1, and the inner insert tube 12 is connected to the front sealing plate. A sound absorbing tube hole 11 is provided at the connection position between the front sealing plate and the inner insert tube 12;

[0078] The mortise and tenon end 2 is composed of a front plate and a side plate. One end of the front plate is connected to the side sealing plate, and the other end of the front plate is connected to the side plate. The side plate is provided with tenons 21 and mortise grooves 22 that are rotationally symmetrically distributed around.

[0079] In this embodiment, the axes of the inserting boss 1 and the tenon end 2 are on the same straight line.

[0080] In this embodiment, the front sealing plate and the side sealing plate of the plug-in boss 1 are hollow inside to form an inner cavity of the plug-in boss, and the front plate and the side plate of the mortise end 2 are hollow inside to form an inner cavity of the mortise end. The inner cavity of the plug-in boss and the inner cavity of the mortise end constitute a sound absorption cavity 4.

[0081] In this embodiment, the plug-in boss 1 is a shell structure, and the outer cross-section of the plug-in boss 1 is square, including a square or a rectangle. The length (y direction) of the plug-in boss 1 ranges from 1 / 3 to 1 of the length (y direction) of the inner cavity of the tenon end 2.

[0082] In this embodiment, the front edge of the plug-in boss 1 is chamfered at a certain angle to facilitate plug-in.

[0083] In this embodiment, the opening cross-section of the sound absorbing pipe hole 11 is square, circular or other shapes.

[0084] In this embodiment, the sum of the length of the inner tube 12 and the length (y-direction) of the plug-in boss 1 does not exceed the length (y-direction) of the sound absorption cavity 4 to ensure that the plug-in boss 1 of the subsequent module can be fully inserted into the internal cavity of the tenon end 2 of the previous module.

[0085] In this embodiment, the size of the outer cross-section of the side sealing plate of the plug-in boss 1 is equal to the inner wall envelope cross-section of the four symmetrically arranged tongue and groove 22 ( Figure 3 The dimensions of the inserting boss 1 are the same as those of the middle dotted line, so that the inserting boss 1 does not rotate in the internal cavity of the tenon end 2;

[0086] A limiting rib 23 is provided in the mortise end 2 , and the length (in the y direction) of the limiting rib 23 is the same as the length (in the y direction) of the mortise groove 22 .

[0087] In this embodiment, the mortise end 2 is a shell structure, and the four peripheral surfaces of the side plate of the mortise end 2 are respectively provided with a group of dovetail-shaped tenons 21 and tenon grooves 22.

[0088] In this embodiment, the outer configuration of the tenon 21 is the same as the inner configuration of the tenon groove 22 , and both the tenon 21 and the tenon groove 22 axially penetrate the front and rear sides of the side plate of the tenon end 2 .

[0089] In this embodiment, a sound insulation backboard 3 is provided at the bottom of the mortise end 2. A backboard limiting boss 31 is provided on the surface of the sound insulation backboard 3. The backboard limiting boss 31 and the bottom of the mortise end 2 form a sealing assembly. The sound insulation backboard 3 plays a sound insulation role.

[0090] Example 2

[0091] See also Figure 4 This embodiment provides a mortise-and-tenon acoustic metamaterial assembly, comprising a plurality of mortise-and-tenon acoustic metamaterial unit modules.

[0092] The mortise-and-tenon acoustic metamaterial assembly is a multi-stage acoustic metamodule assembly comprising a plurality of mortise-and-tenon acoustic metamodule units connected in series along the y direction.

[0093] Several of the mortise-and-tenon acoustic meta-unit modules are arranged front and back in a longitudinal plug-in manner to broaden the sound absorption band, and the rear-stage module plug-in boss 1-2 is inserted into the cavity of the mortise-and-tenon end 2-1 of the front-stage module along the y direction.

[0094] In this embodiment, during longitudinal insertion, the side sealing plate of the plug-in boss 1-2 of the rear module is connected to the inner wall of the mortise groove 22 and the top end of the limiting rib 23 of the mortise end 2-1 of the front module.

[0095] In this embodiment, during longitudinal insertion, the side sealing plate of the rear-stage module plug-in boss 1-2 and the inner wall of the mortise 22 of the mortise end 2-1 of the front-stage module form an interference fit to ensure that the rear-stage module plug-in boss 1-2 does not rotate in the inner cavity of the mortise end.

[0096] In this embodiment, during longitudinal insertion, right-angle grooves are provided around the end surface of the insertion boss 1-2 that contacts the inner cavity of the previous stage tenon end, and the cross section of the right-angle groove is the same as the cross section of the inner cavity of the tenon end.

[0097] In this embodiment, during longitudinal insertion, the sound insulation backboard 3 is sealed and inserted into the bottom of the tenon joint end 2 - 3 of the last-stage module.

[0098] In this embodiment, when plugged in longitudinally, the end face of the plug-in boss 1 of the front stage of the mortise-and-tenon acoustic meta-unit module constitutes a sound-absorbing surface facing the noise source, and the noise source is dissipated by a plurality of sound-absorbing cavities 4 formed by multiple stages in series.

[0099] Example 3

[0100] See also Figure 5 and Figure 6 This embodiment provides a mortise-and-tenon acoustic metamaterial assembly, comprising a plurality of mortise-and-tenon acoustic metamaterial unit modules.

[0101] The mortise-and-tenon acoustic metamaterial assembly is a large-scale acoustic metamodule assembly in which a plurality of mortise-and-tenon acoustic metamodule units are connected in parallel along the x-direction and the z-direction.

[0102] Several of the mortise-and-tenon acoustic meta-unit modules are arranged adjacent to each other by transverse mortise-and-tenon connection to widen the sound absorption band. Each of the mortise-and-tenon acoustic meta-unit modules is transversely mortised to each other along the x-direction and the z-direction through the tenon 211 and the tenon groove 221 of the adjacent module.

[0103] In this embodiment, during transverse mortise and tenon connection, the tenons 211 of the adjacent modules and the tenon grooves 221 of the adjacent modules form an interference fit.

[0104] In this embodiment, when mortising laterally, the assembly methods of the end face where the plug-in boss 1 of the mortise-and-tenon acoustic meta-unit module is located include flush and non-flush assembly methods, that is, mortise-and-tenon acoustic meta-unit modules of several parameters can be staggered in mortising and plugging in a non-coplanar manner to form a staggered decorative effect.

[0105] In this embodiment, when the mortise and tenon joint is performed laterally, the end face of the plug-in boss 1 of the frontmost stage of the mortise and tenon acoustic meta-unit module constitutes a sound-absorbing surface, facing the side of the noise source, and the noise source is dissipated by a plurality of multi-stage parallel-connected sound-absorbing cavities 4.

[0106] Example 4

[0107] See also Figure 6 This embodiment provides a mortise-and-tenon acoustic metamaterial component. Several of the mortise-and-tenon acoustic metamaterial modules can be integrated into a transverse multi-unit assembly component through non-local strong coupling design, and are integrally assembled in a module fixing frame 7 having tenons 21 and mortise grooves 22 having the same configuration as those on the four sides of the mortise-and-tenon acoustic metamaterial module. The rest is the same as in Embodiment 2 or 3.

[0108] Example 5

[0109] See also Figure 6 This embodiment provides a mortise-and-tenon acoustic metamaterial assembly. In addition to providing a traditional sound-absorbing material 6 in the gaps between the front-stage plug-in bosses 1 of several mortise-and-tenon acoustic metastructure unit modules to absorb both mid- and high-frequency noise, the rest is the same as that of Embodiment 2 or 3.

[0110] Example 6

[0111] See also Figure 7 This embodiment provides a mortise-and-tenon acoustic metamaterial assembly, wherein a keel frame 8 is provided in the gap between the plug-in bosses 1 of the frontmost level of several mortise-and-tenon acoustic metamaterial unit modules, and a traditional sound-absorbing material 6 is provided at the lower end of the keel frame 8. The rest is the same as that of Example 2 or Example 3.

[0112] Example 7

[0113] See also Figure 8 This embodiment provides a method for preparing a mortise-and-tenon acoustic metamaterial assembly, and the specific steps are as follows:

[0114] S1. Use an intelligent optimization algorithm to reverse design a jointed acoustic metamaterial component that meets the noise reduction target. The algorithm process is described as follows:

[0115] S1-1. Set a noise reduction target value (e.g., sound absorption coefficient or sound insulation within a specified frequency band), run the optimization design program, and randomly generate N sets of structural parameters for mortise-and-tenon acoustic metamaterial components within the design requirements (e.g., the structural dimension limits for mortise-and-tenon acoustic metamaterial modules);

[0116] S1-2. Perform differential evolution on the N groups of structural parameters of the mortise-and-tenon acoustic metamaterial assemblies to obtain M groups of structural parameters of the mortise-and-tenon acoustic metamaterial assemblies. Calculate and select the group of structural parameters of the mortise-and-tenon acoustic metamaterial assemblies that meets the design conditions (such as the thickness, size, and weight of the mortise-and-tenon acoustic metamaterial assemblies) and merge them with the N groups of structural parameters of the mortise-and-tenon acoustic metamaterial assemblies generated in the previous step.

[0117] S1-3. Calculate target values ​​for the merged structural parameter groups of the mortise-and-tenon acoustic metamaterial assembly, sort the structural parameter groups of the mortise-and-tenon acoustic metamaterial assembly according to the calculated target values ​​(in descending order from largest to smallest), and select the top N groups of structural parameters of the mortise-and-tenon acoustic metamaterial assembly;

[0118] S1-4. Finally, based on the number of iterations or the target threshold termination condition, determine whether the calculation termination condition is met. If so, select a set of structural parameters of the mortise-and-tenon acoustic metamaterial assembly with the optimal noise reduction target value as the optimization result of the mortise-and-tenon acoustic metamaterial assembly. If not, change the structural parameters of the mortise-and-tenon acoustic metamaterial assembly again, and repeat the above iterative calculation until the termination condition is met.

[0119] S2. Using SLA (Solid Light-curing) 3D printing technology, a Lite 600 printer is used to integrally mold the plug-in boss 1 and the mortise end 2 of the mortise-jointed acoustic meta-unit module. The raw material of the mortise-jointed acoustic meta-unit module is a polymer composite material (such as PEEK, PC, phenolic resin glass fiber reinforced material, etc.) or a metal material.

[0120] S3. Connect several of the mortise-and-tenon acoustic metastructure unit modules in series along the longitudinal direction (y-direction) and connect several of the mortise-and-tenon acoustic metastructure unit modules in parallel along the transverse direction (x-direction and z-direction) to form a large-scale multi-stage mortise-and-tenon acoustic metastructure material assembly.

[0121] In this embodiment, in step S2, the injection molding technology can also be used to design a mold, and the HAITIAN MA1600III injection molding machine can be used to integrally prepare the plug-in boss 1 and the mortise end 2 of the mortise-type acoustic meta-unit module.

[0122] The above description of the embodiments is intended to facilitate understanding and use of the invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention, without departing from the scope of the present invention, should be within the scope of protection of the present invention.

Claims

1. A method for preparing a mortise-and-tenon acoustic metamaterial assembly, characterized in that: The mortise-and-tenon acoustic metastructure material assembly comprises a plurality of mortise-and-tenon acoustic metastructure unit modules, wherein the mortise-and-tenon acoustic metastructure unit modules comprise a plug-in boss (1) and a mortise-and-tenon end (2), wherein the bottom end of the plug-in boss (1) and the top end of the mortise-and-tenon end (2) are connected, and the interior of the plug-in boss (1) and the interior of the mortise-and-tenon end (2) are connected to form a sound absorption cavity (4). The specific steps of the method for preparing the mortise and tenon-jointed acoustic metamaterial assembly are as follows: S1. Using intelligent optimization algorithms to reversely design a jointed acoustic metamaterial component that meets the noise reduction target. The algorithm flow for using intelligent optimization algorithms to reversely design a jointed acoustic metamaterial component that meets the noise reduction target is as follows: S1-1. Set a noise reduction target value and randomly generate N sets of structural parameters of mortise-and-tenon acoustic metamaterial components within the design requirements. S1-2. Perform differential evolution on the structural parameters of the N groups of mortise-and-tenon acoustic metamaterial assemblies to obtain M groups of structural parameters of the mortise-and-tenon acoustic metamaterial assemblies. Calculate and select the structural parameter group of the mortise-and-tenon acoustic metamaterial assemblies that meets the design conditions, and merge it with the N groups of structural parameters of the mortise-and-tenon acoustic metamaterial assemblies generated in the previous step. S1-3. Calculating target values ​​of the merged mortise-jointed acoustic metamaterial assembly structural parameter groups, sorting the mortise-jointed acoustic metamaterial assembly structural parameter groups according to the calculated target values, and selecting the top N groups of mortise-jointed acoustic metamaterial assembly structural parameter groups; S1-4. Finally, judging whether the calculation termination condition is satisfied based on the number of iterations or the target threshold termination condition. If satisfied, selecting a set of structural parameters of the mortise-and-tenon acoustic metamaterial assembly with the optimal noise reduction target value as the optimization result of the mortise-and-tenon acoustic metamaterial assembly; If not, the structural parameters of the mortise-and-tenon acoustic metamaterial component are changed again, and the above iterative calculation is repeated until the termination condition is met; S2. Using a preparation process, the plug-in boss (1) and the tenon end (2) of the tenon-type acoustic meta-unit module are integrally formed; S3. Form a large-scale multi-stage mortise-and-tenon acoustic metastructure material assembly by longitudinally connecting a plurality of the mortise-and-tenon acoustic metastructure unit modules in series and transversely connecting a plurality of the mortise-and-tenon acoustic metastructure unit modules in parallel.

2. A mortise-and-tenon acoustic metacell module according to claim 1, characterized in that: It comprises a plug-in boss (1) and a tenon end (2), wherein the bottom end of the plug-in boss (1) and the top end of the tenon end (2) are connected, and the interior of the plug-in boss (1) and the interior of the tenon end (2) are connected to form a sound absorbing cavity (4). The plug-in boss (1) is composed of a front sealing plate and a side sealing plate, one end of the side sealing plate is connected to the front sealing plate, and the other end of the side sealing plate is connected to the top end of the tenon end (2). An inner insert tube (12) is provided in the plug-in boss (1), and the inner insert tube (12) is connected to the front sealing plate. A sound-absorbing tube hole (11) is provided at the position where the front sealing plate and the inner insert tube (12) are connected. The mortise and tenon joint (2) consists of a front plate and a side plate, one end of the front plate is connected to the side sealing plate, and the other end of the front plate is connected to the side plate, and the side plate is provided with tenons (21) and mortise grooves (22) distributed in rotational symmetry around the periphery.

3. The mortise-and-tenon acoustic meta-unit module according to claim 2, characterized in that: The axes of the plug-in boss (1) and the tenon end (2) are on the same straight line; The front sealing plate and the side sealing plate of the plug-in boss (1) are hollow inside to form a plug-in boss inner cavity, the front plate and the side plate of the tenon end (2) are hollow inside to form a tenon end inner cavity, and the plug-in boss inner cavity and the tenon end inner cavity constitute a sound absorbing cavity (4); The length of the plug-in boss (1) ranges from 1 / 3 to 1 / 3 of the length of the inner cavity of the tenon end; The sum of the length of the inner insert tube (12) and the length of the plug-in boss (1) does not exceed the length of the sound absorption cavity (4); The size of the outer cross-section of the side sealing plate of the plug-in boss (1) is the same as the size of the inner wall envelope cross-section of the four symmetrically arranged tongue and groove (22); A limiting rib (23) is provided in the mortise end (2), and the length of the limiting rib (23) is the same as the length of the mortise groove (22).

4. The mortise-and-tenon acoustic meta-unit module according to claim 2, characterized in that: The four peripheral surfaces of the side plate of the mortise joint end (2) are respectively provided with a group of mortises (21) and mortises (22) in a dovetail configuration; The outer configuration of the tenon (21) is the same as the inner configuration of the tenon groove (22), and both the tenon (21) and the tenon groove (22) are axially extended through the front and rear sides of the side plate of the tenon joint end (2).

5. The mortise-and-tenon acoustic meta-unit module according to claim 2, characterized in that: A sound insulation back plate (3) is provided at the bottom of the mortise end (2), a back plate limiting boss (31) is provided on the surface of the sound insulation back plate (3), and the back plate limiting boss (31) and the bottom of the mortise end (2) form a sealing assembly.

6. A mortise-and-tenon acoustic metamaterial assembly, characterized in that: It comprises a plurality of mortise and tenon acoustic meta-unit modules as described in claim 5.

7. The mortise-and-tenon acoustic metamaterial assembly according to claim 6, characterized in that: The mortise-and-tenon acoustic metamaterial assembly is a multi-stage acoustic metamodule assembly comprising a plurality of mortise-and-tenon acoustic metamodule units connected in series. A plurality of the mortise-and-tenon acoustic meta-unit modules are arranged front to back in a longitudinal plug-in manner, and the plug-in boss (1-2) of the rear-stage module is inserted into the cavity of the mortise-and-tenon end (2-1) of the front-stage module.

8. The mortise-and-tenon acoustic metamaterial assembly according to claim 7, characterized in that: During longitudinal insertion, the side sealing plate of the plug-in boss (1-2) of the rear module is connected to the inner wall of the mortise (22) and the top end of the limiting rib (23) of the mortise end (2-1) of the front module. The side sealing plate of the plug-in boss (1-2) of the rear module and the inner wall of the mortise (22) of the mortise end (2-1) of the front module form an interference fit; The sound insulation backboard (3) is sealed and plugged into the bottom of the tenon joint end (2-3) of the last-stage module.

9. The mortise-and-tenon acoustic metamaterial assembly according to claim 6, characterized in that: The mortise-and-tenon acoustic metamaterial assembly is a large-scale acoustic metamodule assembly consisting of several mortise-and-tenon acoustic metamodule units connected in parallel. A plurality of the mortise-jointed acoustic meta-unit modules are adjacently arranged in a transverse mortise-jointed manner, and each of the mortise-jointed acoustic meta-unit modules is transversely mortised to each other via the mortise (211) of an adjacent module and the mortise groove (221) of an adjacent module.

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