Plate-type electromagnetic / acoustic fusion metamaterials, composites, and aircraft

Abstract

The present invention provides a plate-type electromagnetic / acoustic fusion metamaterial, composition and aircraft related to the field of metamaterial technology, including an acoustic functional structure and an electromagnetic functional structure, wherein the electromagnetic functional structure is connected to the acoustic functional structure, and the acoustic functional structure regulates the sound waves incident thereon, and the electromagnetic functional structure regulates the electromagnetic waves incident thereon. The basic unit of the plate-type electromagnetic / acoustic fusion metamaterial proposed in the present invention is mainly designed and prepared at the centimeter scale, with low requirements for processing accuracy, and is very suitable for industrial mass production. The proposed plate-type electromagnetic / acoustic fusion metamaterial has the characteristics of a light and thin structure and multifunctional regulation of electromagnetic and acoustic waves. Compared with the existing technology, it has significant advantages in additional weight, space occupation and application cost, and can effectively overcome the problems of functional interference and reduced economy caused by the current superposition of electromagnetic shielding materials and sound-absorbing and insulating materials in aircraft.

Description

Technical Field

[0001] The present invention relates to the field of metamaterial technology, and in particular to a plate-type electromagnetic / acoustic fusion metamaterial, a composition and an aircraft. Background Art

[0002] As important functional materials, electromagnetic / acoustic materials are widely used in aircraft. Aircraft operate in a complex electromagnetic / acoustic environment. Avionics equipment within the cabin transmits and receives electromagnetic signals, generating electromagnetic interference with each other. The fuselage is subjected to intense structure-borne and airborne noise from the engine and turbulent boundary layer, which in turn transmits vibration noise. High levels of electromagnetic interference and vibration noise pose a serious threat to the safe operation of avionics equipment and the health and comfort of passengers. Traditional solutions employ dense electromagnetic shielding materials (e.g., patents CN115688516A, CN115679046A, and CN115651325A) and thick sound-absorbing and sound-isolating materials (e.g., patents CN115064146A, CN110615883A, and CN108751913A) to control the electromagnetic and acoustic waves that permeate the aircraft, respectively. However, the combined use of electromagnetic shielding materials and sound-absorbing and insulating materials not only affects the effectiveness of their respective functions, but the resulting weight and cost penalties inevitably lead to a decline in the economic efficiency of aircraft. Furthermore, the trend towards more compact and lightweight aircraft is also forcing the materials used to be thinner and more multifunctional. Therefore, lightweight, multifunctional materials that can integrate cross-field control capabilities for electromagnetic and acoustic waves are key to further improving aircraft safety, comfort, and economic efficiency.

[0003] Due to the significant differences in the material properties and propagation characteristics of electromagnetic and acoustic waves, current research on materials that manipulate electromagnetic and acoustic waves has been fragmented within the two physical fields. However, the analogy between electromagnetic and acoustic waves in terms of wave equations allows for commonalities between their research. Specifically, the macroscopic interactions between electromagnetic and acoustic waves and the manipulated materials can be reflected by the wave properties of the manipulated materials (including transmission, reflection, and absorption). Furthermore, the electromagnetic and acoustic wave properties of the manipulated materials are fully described by two pairs of constitutive parameters: the electromagnetic constitutive parameters: dielectric constant and magnetic permeability; and the acoustic constitutive parameters: mass density and bulk modulus. Metamaterials, as artificial functional structures, rely on the strong scattering interaction between electromagnetic / acoustic resonances of subwavelength-scale basic units and incident waves, resulting in dynamic divergence of their electromagnetic / acoustic constitutive parameters. This allows them to achieve extraordinary wave properties unattainable by natural materials, such as negative refraction, superlenses, low-frequency total reflection, and ultrathin total absorption. Because metamaterials abandon the material genes based on natural structures and instead directly reconstruct the material genes through artificial structures, they have great design freedom. Therefore, metamaterials have the inherent advantage of achieving lightweight structures and have great potential to integrate specific electromagnetic and acoustic constitutive parameters.

[0004] Due to their working principle, metamaterials have inherent narrowband working characteristics, which means that the research and application of metamaterials need to be combined with frequency bands. Figure 1 As shown in the figure, by arranging the spectra of electromagnetic waves and acoustic waves side by side by wavelength, it is found that there is a fairly wide overlap between the two wavelengths. This is especially true for the high-frequency radio waves, some microwaves (20MHz to 20GHz), and audible sound (20Hz to 20kHz) frequency bands marked with outlines. This frequency band is closely related to electromagnetic interference and vibration noise in aircraft cabins. Moreover, the wavelengths of the electromagnetic waves and acoustic waves involved in this frequency band are both in the centimeter to meter range, making it very convenient for the design and preparation of metamaterials. Therefore, metamaterials that can achieve cross-field control in this frequency band have very important research and application value. Summary of the Invention

[0005] In view of the defects in the prior art, the purpose of the present invention is to provide a plate-type electromagnetic / acoustic fusion metamaterial, a composition and an aircraft.

[0006] According to the present invention, a plate-type electromagnetic / acoustic fusion metamaterial is provided, which includes an acoustic functional structure and an electromagnetic functional structure. The electromagnetic functional structure is connected to the acoustic functional structure. The acoustic functional structure regulates the sound waves incident on it, and the electromagnetic functional structure regulates the electromagnetic waves incident on it.

[0007] Preferably, the acoustic functional structure includes a frame, a thin plate and a mass block, the thin plate is connected to the frame, and the mass block is fitted to the thin plate to regulate the sound waves incident thereon.

[0008] Preferably, the electromagnetic functional structure includes a conductive pattern, which is embedded in the surface of the mass block to regulate the electromagnetic waves incident thereon.

[0009] Preferably, the acoustic functional structure includes a frame, a thin plate and a constraint body, the thin plate is connected to the frame, the thin plate and the constraint body are in close contact, and the sound waves incident thereon are regulated;

[0010] Preferably, the electromagnetic functional structure includes a conductive pattern, which is embedded in the surface of the mass block and the constraint body to regulate the electromagnetic waves incident thereon.

[0011] Preferably, the conductive pattern includes an open ring, a spiral line, a nested closed loop, and a cross dendrite shape.

[0012] The present invention also provides a fusion metamaterial assembly using a plate-type electromagnetic / acoustic fusion metamaterial, wherein a plurality of plate-type electromagnetic / acoustic fusion metamaterials are distributed in an array.

[0013] Preferably, a carbon-containing porous material is further included, and the carbon-containing porous material is introduced between two adjacent layers of the fusion metamaterial assembly to improve the performance of absorbing electromagnetic waves and sound waves.

[0014] Preferably, a bending mechanism is further included, and a bending mechanism is provided between two adjacent rows of strip-shaped fusion metamaterial assemblies or between two adjacent plate-type electromagnetic / acoustic fusion metamaterials, and bending is achieved through the bending mechanism.

[0015] The present invention also provides an aircraft using a plate-type electromagnetic / acoustic fusion metamaterial.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The plate-type electromagnetic / acoustic fusion metamaterial proposed in the present invention can realize the joint regulation of electromagnetic waves in the frequency band of 20MHz to 20GHz and acoustic waves in the frequency band of 20Hz to 20kHz with the same centimeter-scale basic unit, and can achieve precise control of the transmission, reflection and absorption characteristics of electromagnetic waves and acoustic waves in a specific frequency band after they are incident on the fusion metamaterial by setting the size and material of the basic unit.

[0018] 2) The proposed plate-type electromagnetic / acoustic fusion metamaterial boasts a lightweight structure and multifunctional control of both electromagnetic and acoustic waves. Compared to existing technologies, it offers significant advantages in terms of added weight, space usage, and application cost. It can effectively overcome the functional interference and reduced economic efficiency associated with the current use of superimposed electromagnetic shielding and sound-absorbing materials in aircraft.

[0019] 3) The plate-type electromagnetic / acoustic fusion metamaterial basic unit proposed in the present invention is mainly designed and prepared at the centimeter scale, with low requirements for processing precision, and is very suitable for industrial mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0021] Figure 1 A schematic diagram of the spectrum of electromagnetic waves and sound waves arranged in parallel on a wavelength scale;

[0022] Figure 2 This is a schematic diagram of an application scenario of the present invention in an aircraft;

[0023] Figure 3 This is an embodiment of a single-layer fusion metamaterial in which an electromagnetic functional structure is used as a mass block and an acoustic functional structure is integrated;

[0024] Figure 4 This is an embodiment of a single-layer fusion metamaterial in which an electromagnetic functional structure is used as a frame and an acoustic functional structure is integrated;

[0025] Figure 5 This is an embodiment of a multi-layer fusion metamaterial in which an electromagnetic functional structure is integrated as a mass block with an acoustic functional structure;

[0026] Figure 6 This is an embodiment of a multi-layer fusion metamaterial in which an electromagnetic functional structure is used as a frame and an acoustic functional structure is integrated;

[0027] Figure 7 A schematic diagram of the fused metamaterial with a bendable structure according to the present invention;

[0028] Figure 8 A schematic diagram of a fusion metamaterial of different basic unit structures spliced ​​together in the present invention;

[0029] Figure 9 Schematic diagram of other structural styles that can be selected for the electromagnetic functional structure of the present invention;

[0030] Figure 10 A schematic diagram of a fusion metamaterial with a rotatable structure according to the present invention;

[0031] Figure 11 The electromagnetic S-parameter finite element calculation results of the single-layer fusion metamaterial provided by the embodiment of the present invention;

[0032] Figure 12 Finite element calculation results of the sound insulation of a single-layer fusion metamaterial provided in an embodiment of the present invention;

[0033] Figure 13The finite element calculation results of the sound absorption coefficient of the double-layer fusion metamaterial provided in the embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0035] Example 1

[0036] The present invention provides a plate-type electromagnetic / acoustic fusion metamaterial, such as Figure 3 FIG. 1 shows an embodiment of a single-layer fusion metamaterial in which an electromagnetic functional structure is used as a mass block and an acoustic functional structure is integrated with the electromagnetic functional structure.

[0037] Acoustic functional structure and electromagnetic functional structure, the electromagnetic functional structure is connected to the acoustic functional structure, the acoustic functional structure regulates the sound waves incident on it, and the electromagnetic functional structure regulates the electromagnetic waves incident on it.

[0038] The frame 111, the thin plate 112, and the mass block 113 constitute an acoustic functional structure, wherein the mass block 113 fits tightly with the thin plate 112, and the formed "mass-spring" system has an intrinsic acoustic mode, which realizes the regulation of the sound waves incident thereon.

[0039] The conductive pattern 114 is embedded on the surface of the mass block 113 as an electromagnetic functional structure, wherein the conductive pattern 114 is in the form of an open ring, and the "inductor-capacitor" system formed has an intrinsic electromagnetic mode, which can realize the regulation of the electromagnetic waves incident thereon.

[0040] More specifically, Figure 1 As shown, the spectra of electromagnetic waves and sound waves are arranged in parallel on the wavelength scale, and there is a fairly wide overlap between the two on the wavelength scale. It should be noted that the electromagnetic waves in the 20MHz to 20GHz frequency band and the sound waves in the 20Hz to 20kHz frequency band are closely related to the electromagnetic interference and vibration noise in the aircraft cabin. In addition, the wavelengths of the electromagnetic waves and sound waves in this frequency band are both in the centimeter to meter level, which is very convenient for the design and preparation of metamaterials. Therefore, the electromagnetic waves and sound waves in this frequency band are selected as the main working frequency band of the fusion metamaterial provided by the present invention.

[0041] Example 2

[0042] The present invention provides a plate-type electromagnetic / acoustic fusion metamaterial, such as Figure 4 FIG. 1 shows a single-layer fusion metamaterial embodiment of the present invention in which the electromagnetic functional structure is used as a frame and is integrated with the acoustic functional structure.

[0043] In this embodiment, the frame 111, the thin plate 112, and the constraint body 115 constitute an acoustic functional structure, wherein the thin plate 112 fits tightly against the constraint body 115, and under the constraint of the constraint body 115, the "mass-spring" system formed by itself has an intrinsic acoustic mode, thereby realizing the regulation of the sound waves incident thereon.

[0044] The conductive pattern 114 is embedded in the surface of the frame 111 and the constraint body 115 as an electromagnetic functional structure, wherein the conductive pattern 114 is in the form of a spiral line, and the "inductor-capacitor" system formed has an intrinsic electromagnetic mode, which realizes the regulation of the electromagnetic waves incident thereon.

[0045] It should be noted that the electromagnetic functional structure contained in the fusion metamaterial described in the present invention is not limited to the regulation of a fixed narrowband frequency band. In practical applications, a tunable material, such as a phase change material, can be used to make the electromagnetic properties of this phase change material reversibly change under the influence of external factors (such as temperature, light, humidity, voltage, etc.), thereby realizing dynamic modulation of its electromagnetic wave characteristics.

[0046] In order to ensure the functional independence between the electromagnetic functional structure and the acoustic functional structure contained in the fusion metamaterial described in the present invention, the frame 111, thin plate 112 and constraint body 115 of the basic unit of the fusion metamaterial proposed in the embodiment are all weakly polarized, weakly magnetized and non-conductive materials, so no eddy current or electromagnetic induction will be generated when electromagnetic waves are incident; in addition, the conductive pattern 114 is firmly embedded in the surface of the mass block 113 or the frame 111 and the constraint body 115, and will not excite its own intrinsic acoustic mode under the low-frequency acoustic wave excitation conditions of concern.

[0047] Example 3

[0048] The present invention also provides a fusion metamaterial assembly comprising two layers of the fusion metamaterials shown in Example 1, such as Figure 5 FIG. 1 shows an embodiment of a multi-layer fusion metamaterial in which an electromagnetic functional structure is integrated as a mass block with an acoustic functional structure.

[0049] Introducing a carbon-containing porous material 116 , such as carbon-containing polyurethane, melamine, or polystyrene foam, between two layers of fused metamaterials can simultaneously improve the performance of absorbing electromagnetic waves and acoustic waves.

[0050] Preferably, the two layers of the fusion metamaterial shown in Example 1 have different composition parameters, namely, size parameters and material parameters, so as to have multi-directional polarization characteristics and multi-band operating characteristics.

[0051] Example 4

[0052] The present invention also provides a fusion metamaterial assembly comprising two layers of the fusion metamaterials shown in Example 2, such as Figure 6 FIG. 1 shows an embodiment of a multi-layer fusion metamaterial in which an electromagnetic functional structure is used as a frame and an acoustic functional structure is integrated.

[0053] Introducing the carbon-containing porous material 116 between the two layers of fusion metamaterial can simultaneously improve the performance of absorbing electromagnetic waves and acoustic waves.

[0054] Preferably, the two layers of the fusion metamaterial shown in Example 2 have different composition parameters, namely, size parameters and material parameters, so as to have multi-directional polarization characteristics and multi-band operating characteristics.

[0055] Example 5

[0056] This embodiment 5 is completed on the basis of embodiment 1 or embodiment 2. Figure 7 , which is a schematic diagram of the fusion metamaterial with a bendable structure according to the present invention.

[0057] In order to achieve bending, a bending mechanism 117, such as a hinge structure, a bayonet mechanism, a magnetic mechanism, etc., is provided between two adjacent rows of strip-shaped basic units to achieve a certain degree of bending.

[0058] Figure 7 Figure (a) is a schematic diagram of the fusion metamaterial shown in Example 1 to achieve a bent structural style; Figure (b) is a schematic diagram of the fusion metamaterial shown in Example 2 to achieve a bent structural style.

[0059] It is worth noting that the fusion metamaterial of the present invention with a bendable structure is not limited to Figure 7 Each basic unit can be provided with a bending mechanism 117 to achieve any desired bending structure style.

[0060] Example 6

[0061] This embodiment 6 is completed on the basis of embodiment 5. Figure 8 , which is a schematic diagram of a fusion metamaterial of different basic unit structural styles spliced ​​together according to the present invention.

[0062] By providing a bending mechanism 117, the interval bending is formed by the strip-shaped arrangement of the basic units of embodiment 1 and the basic units of embodiment 2. This embodiment of the in-plane arrangement of different configurations can give the fusion metamaterial multi-directional polarization characteristics and multi-band operating characteristics.

[0063] Example 7

[0064] This embodiment 7 is completed on the basis of embodiment 1. Figure 9, which is a schematic diagram of other structural styles that can be selected for the electromagnetic functional structure of the present invention.

[0065] This schematic diagram illustrates alternative structural configurations for the electromagnetic functional structure of the fused metamaterial shown in Example 1. The conductive pattern 114 shown in (a) is a single open-ring structure; the conductive pattern 114 shown in (b) is a nested closed-ring structure; and the conductive pattern 114 shown in (c) is a cross-branch structure.

[0066] The different structural styles of the conductive patterns 114 result in different intrinsic electromagnetic modes in the “inductor-capacitor” system they constitute, thereby achieving different control effects on the electromagnetic waves incident thereon.

[0067] It should be noted that the structural style of the conductive pattern 114 is not limited to the style shown in the embodiment of the present invention. Different styles determine different electromagnetic wave polarization directions, control frequencies and bandwidths.

[0068] Example 8

[0069] This embodiment 8 is completed on the basis of embodiment 1, referring to Figure 10 , Figure 10 Schematic diagram of the fusion metamaterial with a rotatable structural style of the present invention.

[0070] Once the fused metamaterial is formed, its polarization direction is determined. To effectively control electromagnetic waves incident with different polarization directions, a rotation mechanism (not shown) can be installed on the back of each basic unit to achieve a certain degree of rotation, such as a manual screw mechanism or an automatic motor mechanism.

[0071] The fusion metamaterial shown in Example 1 is selected below to characterize its electromagnetic wave characteristics and acoustic wave characteristics through finite element calculation.

[0072] The dimensional parameters of the basic unit are: the outer side of the frame 111 is 35 mm long; the inner side is 32 mm long; the thin plate 112 has a side length of 35 mm and completely covers the frame; the mass block 113 has a side length of 20 mm and is located in the center of the frame.

[0073] The material parameters of the basic unit are: the density of frame 111 is 1900kg / m 3 , Young's modulus is 22GPa, Poisson's ratio is 0.15; the density of the thin plate 112 is 1190kg / m 3 , Young's modulus is 3.2(1+0.005j)GPa, Poisson's ratio is 0.35; the density of mass block 113 is 8960kg / m 3 , Young's modulus is 110 GPa, and Poisson's ratio is 0.35.

[0074] Example 9

[0075] The present invention also provides an aircraft, which adopts the plate-type electromagnetic / acoustic fusion metamaterial 11 described in any one of Examples 1-8.

[0076] like Figure 2 Figure 2 shows a schematic diagram of an aircraft application scenario for the present invention. This scenario depicts an aircraft immersed in a complex environment of electromagnetic waves 12 and acoustic waves 13. Electromagnetic waves 12 include those generated by external antennas and radars, as well as electromagnetic interference generated by internal equipment when transmitting and receiving electromagnetic signals. Acoustic waves 13, primarily excited by the engine and the turbulent boundary layer, include airborne sound propagating through the air and structure-borne sound propagating through solid structures such as the cabin walls.

[0077] The fusion metamaterial 11 proposed in the present invention can be conveniently placed in the cabin wall panels, ceiling and floor structures, and can regulate high-level electromagnetic interference and vibration noise, thereby reducing electromagnetic interference and vibration noise.

[0078] It should be noted that in specific application scenarios, the frequency bands of electromagnetic and acoustic waves to be controlled must be determined in advance. Based on the target frequency band, the corresponding structural dimensions and materials of the fusion metamaterial are designed to precisely control the incident electromagnetic and acoustic waves.

[0079] Those skilled in the art will understand that Figure 2 The system components shown do not limit the application scenarios of the present invention in aircraft, and may include more or fewer components than shown in the figures, or combine certain components, or arrange the components differently.

[0080] Characterization of electromagnetic wave characteristics

[0081] Reference Figure 11 , Figure 11 The electromagnetic S-parameter finite element calculation results of the single-layer fusion metamaterial provided in the embodiment of the present invention.

[0082] S parameters are network parameters based on the relationship between incident and reflected waves. In the embodiments of the present invention, S parameters are used to characterize the ability of a fusion metamaterial to control electromagnetic waves. The S11 parameter is defined as the square root of the ratio of the electromagnetic wave energy at the incident end to the incident electromagnetic wave energy, and the S21 parameter is defined as the square root of the ratio of the electromagnetic wave energy at the exit end to the incident electromagnetic wave energy.

[0083] like Figure 11As shown, for the fusion metamaterial basic unit shown in Basic Example 1, its S11 parameter under the condition of electromagnetic wave incidence in the TE polarization direction reaches a peak value of nearly 0 dB at 6.3 GHz and 9.6 GHz, and at the same time, the S21 parameter curve reaches a valley value, indicating that the fusion metamaterial basic unit shown in Basic Example 1 can achieve a nearly total reflection effect on the incident electromagnetic wave at the peak frequencies of 6.3 GHz and 9.6 GHz.

[0084] It should be noted that the effect of the fusion metamaterial proposed in the present invention in electromagnetic wave control is not limited to the S parameter calculation results shown in this embodiment, and can also include various modulation effects such as filtering and frequency selection, which are not specifically limited here.

[0085] Acoustic wave characterization

[0086] Reference Figure 12 , Figure 12 The finite element calculation results of the sound insulation of the single-layer fusion metamaterial provided by the embodiment of the present invention.

[0087] In the field of acoustics, the sound insulation capacity of a material is usually measured by the sound insulation value or transmission loss (represented by the symbol TL). TL is defined as

[0088]

[0089] Where t I represents the transmission coefficient.

[0090] like Figure 12 As shown, the sound insulation of the fusion metamaterial basic unit shown in Basic Example 1 reaches a peak of nearly 45dB at 700Hz under normal sound wave incidence conditions, demonstrating excellent low-frequency sound insulation performance. This effect is due to the fact that the fusion metamaterial basic unit shown in Basic Example 1 can generate a strong anti-resonant vibration mode when excited by a 700Hz sound wave, thereby forming a highly efficient reflection of the 700Hz incident sound wave.

[0091] Reference Figure 13 , Figure 13 The finite element calculation results of the sound absorption coefficient of the double-layer fusion metamaterial provided in the embodiment of the present invention.

[0092] Here we select Extended Example 1 as the main research object, such as Figure 5 As shown, this embodiment stacks two layers of the fused metamaterial described in Example 1, and introduces melamine foam between the two layers. The acoustic parameters of the melamine foam used in the finite element calculations are: porosity 0.995, thermal characteristic length 470 μm, viscous characteristic length 240 μm, tortuosity factor 1.0059, and flow resistivity 10500.

[0093] Since the two-layer fusion metamaterial shown in the first basic embodiment can form coupled resonance under acoustic wave excitation, the input impedance is matched with the air impedance and the transmission of acoustic energy at the output end is avoided, thereby achieving a highly efficient sound absorption effect.

[0094] The equivalent impedance of the metamaterial surface can be calculated from the sound pressure intensity and the speed of the thin plate 112, Z = <δp> / <W'> , where p is the surface acoustic pressure intensity and W' is the membrane velocity. The surface Green's function is defined as follows: <g> ＝ <w> / <δp>, so the equivalent impedance can be obtained by Green's function, that is: Z=(-iw <g>) -1 The equivalent impedance expression of the metamaterial surface is as follows: M =(-iw <G M >) -1 The cavity between the two layers adds an additional impedance Z' = <δp> / <W'> , total impedance Z h =Z M +Z', so the Green's function of the system is <G h >=(-iwZ h ) -1 . Take G h The imaginary part of Obviously, when Im(Z h )=0, Im <G h > reaches a peak value. The peak value of the imaginary part of the Green's function represents the resonant mode state, at which point perfect impedance matching is achieved.

[0095] Under the condition of vertical incidence of sound waves, the sound absorption coefficient of the material is defined as α=1-|T| 2 -|R| 2 , where T is the sound pressure transmission coefficient and R is the sound pressure reflection coefficient.

[0096] like Figure 13 As shown, the sound absorption curve of Extended Example 1 reaches the first sound absorption peak at 430 Hz and the second sound absorption peak at 1100 Hz, and the sound absorption peak values ​​are both close to 0.76, demonstrating excellent low-frequency sound absorption properties.

[0097] It should be noted that the effect of the fusion metamaterial proposed in the present invention in terms of sound wave regulation is not limited to the calculation results of the sound insulation and sound absorption coefficient shown in this embodiment, but can also include various modulation effects such as filtering and frequency selection, which are not specifically limited here.

[0098] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0099] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.< / g> < / w> < / g>

Claims

1. A plate-type electromagnetic / acoustic fusion metamaterial, characterized in that: It includes an acoustic functional structure and an electromagnetic functional structure, wherein the electromagnetic functional structure is connected to the acoustic functional structure, the acoustic functional structure regulates the sound waves incident thereon, and the electromagnetic functional structure regulates the electromagnetic waves incident thereon; The acoustic functional structure comprises a frame (111), a thin plate (112), and a mass block (113); the thin plate (112) is connected to the frame (111); the mass block (113) is fitted to the thin plate (112) to regulate the sound waves incident thereon; The electromagnetic functional structure comprises a conductive pattern (114), wherein the conductive pattern (114) is embedded on the surface of the mass block (113) and regulates electromagnetic waves incident thereon; The acoustic functional structure comprises a frame (111), a thin plate (112), and a constraint (115); the thin plate (112) is connected to the frame (111); the thin plate (112) and the constraint (115) are fitted together to regulate the sound waves incident thereon; The electromagnetic functional structure comprises a conductive pattern (114), wherein the conductive pattern (114) is embedded in the surface of the mass block (113) and the constraint body (115) to regulate electromagnetic waves incident thereon.

2. The plate-type electromagnetic / acoustic fusion metamaterial according to claim 1, characterized in that: The conductive pattern (114) includes an open ring shape, a spiral line shape, a nested closed loop shape, and a cross tree branch shape.

3. A fusion metamaterial assembly using the plate-type electromagnetic / acoustic fusion metamaterial (11) according to claim 1, characterized in that: A plurality of the plate-type electromagnetic / acoustic fusion metamaterials (11) are distributed in an array.

4. The fusion metamaterial assembly according to claim 3, characterized in that: It also includes a carbon-containing porous material (116), which is introduced between two adjacent layers of the fusion metamaterial assembly to improve the performance of absorbing electromagnetic waves and sound waves.

5. The plate-type electromagnetic / acoustic fusion metamaterial assembly according to claim 3, characterized in that: It also includes a bending mechanism (117), which is provided between two adjacent rows of strip-shaped fusion metamaterial assemblies or between two adjacent plate-type electromagnetic / acoustic fusion metamaterials (11), and bending is achieved through the bending mechanism (117).

6. An aircraft, characterized in that: The plate-type electromagnetic / acoustic fusion metamaterial according to any one of claims 1 to 2 is used.

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