CN116416959A - Plate-type electromagnetic/acoustic fusion metamaterial, composition and aircraft - Google Patents
Plate-type electromagnetic/acoustic fusion metamaterial, composition and aircraft Download PDFInfo
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Abstract
The invention provides a plate-type electromagnetic/acoustic fusion metamaterial, a plate-type electromagnetic/acoustic fusion composition and an aircraft, which relate to the technical field of metamaterials. The plate-type electromagnetic/acoustic fusion metamaterial basic unit provided by the invention is mainly designed and prepared in a centimeter scale, has low requirements on processing precision, and is very suitable for industrial mass production. The plate-type electromagnetic/acoustic fusion metamaterial has the characteristics of light and thin structure and multifunctional regulation and control of electromagnetic waves and acoustic waves. Compared with the prior art, the electromagnetic shielding material has the advantages of obvious additional weight, space occupation and application cost, and can effectively solve the problems of functional interference, economic efficiency reduction and the like caused by the superposition of the electromagnetic shielding material and the sound absorbing and insulating material in the aircraft.
Description
Technical Field
The invention relates to the technical field of metamaterials, in particular to a plate-type electromagnetic/acoustic fusion metamaterial, a composition and an aircraft.
Background
Electromagnetic/acoustic materials are important functional materials, and have wide application range and large coverage area in aircrafts. When the aircraft flies, in a complex electromagnetic/acoustic environment, electromagnetic interference can be generated between the avionics equipment in the cabin when the avionics equipment receives and transmits electromagnetic signals; the fuselage is subjected to intense structural and air acoustic excitation by the engine and turbulent boundary layers and transmits vibration noise. High levels of electromagnetic interference and vibration noise can pose a serious threat to the safe operation of avionics and the health and comfort of the occupants. The traditional solution is to use a dense electromagnetic shielding material (for example, patent CN115688516A, CN115679046A, CN 115651325A) and a thick sound absorbing and insulating material (for example, patent CN115064146A, CN110615883A, CN108751913 a) to regulate and control electromagnetic waves and sound waves, respectively, which are filled in the aircraft. However, the use of electromagnetic shielding materials in combination with sound absorbing and insulating materials not only affects the effective performance of the respective functions, but the consequent weight and cost penalty tends to result in reduced economy of the aircraft. In addition, the trend of the aircraft toward compact and lightweight has been forcing the materials used therein to be light and thin and multifunctional. Therefore, a lightweight and thin multifunctional material capable of integrating electromagnetic wave and acoustic wave cross-field regulation capability becomes a key for promoting further improvement of safety, comfort and economy of an aircraft.
Because of the great difference between the material properties and propagation characteristics of electromagnetic and acoustic waves, current research on electromagnetic and acoustic wave regulatory materials is split between two physical fields. However, the analogy of electromagnetic waves and acoustic waves in wave equation form has led to the study of both in common, i.e. the macroscopic effects of electromagnetic waves and acoustic waves on the modulating material can be reflected by the wave characteristics of the modulating material, including transmission characteristics, reflection characteristics and absorption characteristics. Furthermore, the electromagnetic fluctuation characteristic and the acoustic fluctuation characteristic of the regulating material are completely described by two pairs of constitutive parameters (electromagnetic constitutive parameters: dielectric constant and magnetic permeability; acoustic constitutive parameters: mass density and bulk modulus), respectively. As an artificial functional structure, meta-materials (meta-materials) rely on electromagnetic/acoustic resonance of sub-wavelength scale basic units to generate strong scattering action with incident waves, so that electromagnetic/acoustic constitutive parameters of the meta-materials exhibit dynamic scattering characteristics, and thus, extraordinary fluctuation characteristics which cannot be achieved by natural materials, such as negative refraction, superlenses, low-frequency total reflection, ultrathin total absorption and the like, are realized. Because the metamaterial abandons the material genes based on the natural structure, the material genes are directly reconstructed through the artificial structure, so that the metamaterial has great design freedom. Therefore, the metamaterial has the inherent advantage of being light and thin in structure, and has great potential of integrating specific electromagnetic/acoustic constitutive parameters.
Because of the working principle, the metamaterial has inherent narrow-band working characteristics, so that the research and the application of the metamaterial are combined with a frequency band. As shown in fig. 1, the frequency spectrums of the electromagnetic wave and the sound wave are arranged in parallel according to the wavelength scale, so that a quite wide superposition area exists between the electromagnetic wave and the sound wave on the wavelength scale, particularly, a high-frequency radio wave marked by a frame line is closely related to electromagnetic interference and vibration noise in an aircraft cabin and partial microwave (20 MHz-20 GHz) and audible sound (20 Hz-20 kHz) frequency bands; in addition, the wavelengths of electromagnetic waves and sound waves related to the frequency range are in the centimeter-meter level, so that the metamaterial is very convenient to design and prepare. Therefore, the metamaterial capable of realizing cross-field regulation and control on the frequency band has very important research and application values.
Disclosure of Invention
In view of the drawbacks of the prior art, an object of the present invention is to provide a plate-type electromagnetic/acoustic fusion metamaterial, a composition and an aircraft.
The plate-type electromagnetic/acoustic fusion metamaterial provided by the invention comprises 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 and controls the sound waves incident on the electromagnetic functional structure, and the electromagnetic functional structure regulates and controls the electromagnetic waves incident on the electromagnetic functional structure.
Preferably, the acoustic functional structure comprises a frame, a thin plate and a mass block, wherein the thin plate is connected to the frame, and the mass block is attached to the thin plate to regulate and control sound waves incident on the mass block.
Preferably, the electromagnetic functional structure comprises a conductive pattern, and the conductive pattern is fixedly embedded on the surface of the mass block and is used for regulating and controlling the electromagnetic waves incident on the conductive pattern.
Preferably, the acoustic functional structure comprises a frame, a thin plate and a restraint body, wherein the thin plate is connected to the frame, and the thin plate and the restraint body are attached to regulate and control the sound waves incident on the thin plate and the restraint body;
preferably, the electromagnetic functional structure comprises a conductive pattern, and the conductive pattern is fixedly embedded on the surfaces of the mass block and the restraint body and is used for regulating and controlling the electromagnetic waves incident on the conductive pattern.
Preferably, the conductive pattern comprises an open loop shape, a spiral shape, a nested closed loop shape, a cross branch shape.
The invention also provides a fusion metamaterial combination body adopting the plate-type electromagnetic/acoustic fusion metamaterial, and a plurality of plate-type electromagnetic/acoustic fusion metamaterials are distributed in an array.
Preferably, the composite material further comprises a carbon-containing porous material, wherein the carbon-containing porous material is introduced between two adjacent layers of the fused metamaterial composite body, and the performance of absorbing electromagnetic waves and sound waves is improved through the carbon-containing porous material.
Preferably, the device also comprises a bending mechanism, wherein the bending mechanism is arranged between two adjacent rows of fusion metamaterial assemblies in strip arrangement or between two adjacent plate-type electromagnetic/acoustic fusion metamaterials, and bending is realized through the bending mechanism.
The invention also provides an aircraft, which adopts the plate-type electromagnetic/acoustic fusion metamaterial.
Compared with the prior art, the invention has the following beneficial effects:
(1) The plate-type electromagnetic/acoustic fusion metamaterial provided by the invention can realize the joint regulation and control of electromagnetic waves in the frequency range of 20 MHz-20 GHz and sound waves in the frequency range of 20 Hz-20 kHz by using the same centimeter-scale basic unit, and can realize the accurate control of the transmission, reflection and absorption characteristics of the electromagnetic waves and sound waves in the specific frequency range after entering the fusion metamaterial by setting the size and the material of the basic unit.
2) The plate-type electromagnetic/acoustic fusion metamaterial provided by the invention has the characteristics of light and thin structure and multifunctional regulation and control of electromagnetic waves and acoustic waves. Compared with the prior art, the electromagnetic shielding material has the advantages of obvious additional weight, space occupation and application cost, and can effectively solve the problems of functional interference, economic efficiency reduction and the like caused by the superposition of the electromagnetic shielding material and the sound absorbing and insulating material in the aircraft.
3) The plate-type electromagnetic/acoustic fusion metamaterial basic unit provided by the invention is mainly designed and prepared in a centimeter scale, has low requirements on processing precision, and is very suitable for industrial mass production.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a schematic diagram of electromagnetic and acoustic spectra arranged in parallel on a wavelength scale;
FIG. 2 is a schematic view of an application scenario of the present invention in an aircraft;
FIG. 3 is a single layer fused metamaterial embodiment of the present invention fused with an electromagnetically functional structure as a mass and acoustically functional structure;
FIG. 4 is a single layer fused metamaterial embodiment of the present invention fused with an acoustically functional structure as a frame;
FIG. 5 is a multilayer fusion metamaterial embodiment in which an electromagnetic functional structure of the present invention is fused as a mass and acoustic functional structure;
FIG. 6 is an embodiment of a multi-layer fusion metamaterial of the present invention fused with an acoustically functional structure as a frame;
FIG. 7 is a schematic diagram of a fusion metamaterial with bendable structure patterns according to the present invention;
FIG. 8 is a schematic diagram of a fused metamaterial with different basic unit structure patterns spliced by the invention;
FIG. 9 is a schematic diagram of alternative structural patterns of the electromagnetic functional structure of the present invention;
FIG. 10 is a schematic diagram of a fused metamaterial in a rotatable structural style in accordance with the present invention;
FIG. 11 shows the result of finite element calculation of electromagnetic S parameters of a single-layer fusion metamaterial provided by the embodiment of the invention;
FIG. 12 is a finite element calculation result of sound insulation amount of a single-layer fusion metamaterial provided by the embodiment of the invention;
fig. 13 is a finite element calculation result of the sound absorption coefficient of the double-layer fusion metamaterial provided by the embodiment of the invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Example 1
The invention provides a plate-type electromagnetic/acoustic fusion metamaterial, which is shown in fig. 3 and is a single-layer fusion metamaterial embodiment in which an electromagnetic functional structure is used as a mass block and an acoustic functional structure to be fused.
The electromagnetic functional structure is connected to the acoustic functional structure, the acoustic functional structure regulates and controls the sound wave incident on the electromagnetic functional structure, and the electromagnetic functional structure regulates and controls the electromagnetic wave incident on the electromagnetic functional structure.
The frame 111, the thin plate 112 and the mass block 113 form an acoustic functional structure, wherein the mass block 113 is closely attached to the thin plate 112, and an intrinsic acoustic mode exists in a formed mass-spring system, so that the regulation and control of sound waves incident on the system are realized.
The conductive pattern 114 is fixedly embedded on the surface of the mass block 113 to serve as an electromagnetic functional structure, wherein the conductive pattern 114 is in a form of an open ring, and an intrinsic electromagnetic mode exists in an inductor-capacitor system formed by the conductive pattern 114, so that the regulation and control of the electromagnetic wave incident on the inductor-capacitor system are realized.
More specifically, as shown in fig. 1, the spectrums of electromagnetic waves and acoustic waves are arranged in parallel on a wavelength scale, and there is a fairly wide overlapping area between the two on the wavelength scale. The electromagnetic wave of 20 MHz-20 GHz frequency band and the sound wave of 20 Hz-20 kHz frequency band are closely related to electromagnetic interference and vibration noise in the cabin of the aircraft. In addition, the wavelengths of electromagnetic waves and sound waves in the frequency range are in the centimeter-meter level, so that the metamaterial is very convenient to design and prepare. Therefore, electromagnetic waves and sound waves of the frequency band are selected as main working frequency bands of the fusion metamaterial provided by the invention.
Example 2
The invention provides a plate-type electromagnetic/acoustic fusion metamaterial, which is shown in fig. 4 and is a single-layer fusion metamaterial embodiment in which an electromagnetic functional structure is used as a frame and fused with an acoustic functional structure.
In this embodiment, the frame 111, the sheet 112 and the constraining body 115 form an acoustic functional structure, where the sheet 112 is closely attached to the constraining body 115, and an intrinsic acoustic mode exists in a "mass-spring" system formed by itself under the constraint of the constraining body 115, so as to regulate and control the sound wave incident thereon.
The conductive pattern 114 is fixedly embedded on the surfaces of the frame 111 and the restraint body 115 to serve as an electromagnetic functional structure, wherein the conductive pattern 114 is in a spiral line form, and an intrinsic electromagnetic mode exists in a formed 'inductance-capacitance' system, so that the regulation and control of the electromagnetic waves incident on the system are realized.
It should be noted that, the electromagnetic functional structure included in the fusion metamaterial is not limited to the regulation and control of a certain fixed narrowband frequency band, and in practical application, a tunable material such as a phase-change material can be selected to enable electromagnetic properties of the phase-change material to be reversibly changed under the influence of external factors (such as temperature, illumination, humidity, voltage and the like), so that dynamic modulation of electromagnetic fluctuation characteristics of the phase-change material is realized.
In order to ensure functional independence between the electromagnetic functional structure and the acoustic functional structure contained in the fusion metamaterial, the frame 111, the thin plate 112 and the restraint body 115 of the fusion metamaterial basic unit proposed in the embodiment are all made of weakly polarized, weakly magnetized and nonconductive materials, so that eddy current or electromagnetic induction is not generated when electromagnetic waves are incident; in addition, the conductive pattern 114 is fixedly embedded on the mass 113 or the surfaces of the frame 111 and the constraining body 115, and does not excite own intrinsic acoustic modes under the condition of low-frequency acoustic wave excitation of interest.
Example 3
The invention also provides a fusion metamaterial combination body combining the two layers of the fusion metamaterials shown in the embodiment 1, and as shown in fig. 5, the fusion metamaterial combination body is a multilayer fusion metamaterial embodiment in which the electromagnetic functional structure is used as a mass block and is fused with the acoustic functional structure.
The introduction of a carbonaceous porous material 116, such as a carbonaceous polyurethane, melamine or polystyrene foam, between two layers of fused metamaterial can improve both electromagnetic and acoustic wave absorption properties.
Preferably, the two layers of the fused metamaterials shown in example 1 have different composition parameters, namely size parameters and material parameters, so as to be capable of multi-directional polarization characteristics and multi-band operation characteristics.
Example 4
The invention also provides a fusion metamaterial combination body combining the two layers of fusion metamaterials shown in the embodiment 2, and the fusion metamaterial combination body is a multilayer fusion metamaterial embodiment in which the electromagnetic functional structure is used as a frame and fused with the acoustic functional structure as shown in fig. 6.
The carbonaceous porous material 116 is introduced between the two layers of fused meta-materials, so that the performance of absorbing electromagnetic waves and sound waves can be improved simultaneously.
Preferably, the two layers of the fused metamaterials shown in example 2 have different composition parameters, namely size parameters and material parameters, so as to be capable of multi-directional polarization characteristics and multi-band operation characteristics.
Example 5
In this embodiment 5, after the completion of embodiment 1 or embodiment 2, as shown in fig. 7, a schematic diagram of a fusion metamaterial with a bendable structure pattern according to the present invention is shown.
In order to achieve bending, a bending mechanism 117, such as a hinge structure, a bayonet mechanism, a magnetic attraction mechanism, etc., is disposed between two adjacent rows of the basic units in a strip-like arrangement, so as to achieve bending to a certain extent.
FIG. 7 (a) is a schematic diagram showing a bending structure pattern of the fusion metamaterial according to embodiment 1; (b) Fig. is a schematic diagram of implementing a bending structure pattern by fusing metamaterials as shown in embodiment 2.
It should be noted that the fusion metamaterial with the bendable structure pattern of the present invention is not limited to the bending strips shown in fig. 7. Bending mechanism 117 may be provided between each base unit to achieve any desired bending configuration.
Example 6
In this embodiment 6, after the completion of the embodiment 5, as shown in fig. 8, a schematic diagram of the fusion metamaterial with different basic unit structure patterns spliced by the present invention is shown.
By providing the bending mechanism 117, the base unit of embodiment 1 and the base unit of embodiment 2 arranged in a strip shape are bent at intervals. Such embodiments with different configurations of in-plane arrangements can impart multi-directional polarization properties and multi-band operational properties to the fused metamaterials.
Example 7
The schematic diagram shows other structural patterns of the electromagnetic functional structure of the fusion metamaterial shown in the embodiment 1. Wherein (a) the conductive pattern 114 shown in the drawing is a single split ring structural style; (b) The conductive pattern 114 is shown in a nested closed loop configuration; (c) The conductive pattern 114 is shown as a cross-tree pattern.
The different structural styles of the conductive patterns 114 cause the "inductance-capacitance" system formed by the conductive patterns to have different intrinsic electromagnetic modes, so as to realize different modulating effects on electromagnetic waves incident thereon.
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, and different styles determine different polarization directions, adjusting frequencies and bandwidths of electromagnetic waves.
Example 8
This example 8 was completed on the basis of example 1, and referring to fig. 10, fig. 10 is a schematic diagram of a fusion metamaterial in a rotatable structure form according to the present invention.
Once the fused metamaterial is formed, the polarization direction of the fused metamaterial is determined. In order to effectively regulate and control electromagnetic waves incident in different polarization directions, a rotation mechanism (not shown in the figure), such as a manual screw mechanism, an automatic motor mechanism, etc., may be provided on the back of each basic unit to achieve a certain degree of rotation.
The fusion metamaterial shown in the example 1 is selected and characterized in electromagnetic fluctuation characteristics and acoustic fluctuation characteristics through finite element calculation.
The dimensional parameters of the basic unit are: the outer edge of the frame 111 is 35mm long; the inner side length is 32mm; the side of the thin plate 112 is 35mm, and the frame is completely covered; the mass 113 is 20mm on the side and is centered in the frame.
The material parameters of the basic unit are as follows: the density of the frame 111 is 1900kg/m 3 Young's modulus of 22GPa and Poisson's ratio of 0.15; the density of the sheet 112 was 1190kg/m 3 Young's modulus of 3.2 (1+0.005 j) GPa, poisson's ratio of 0.35; mass 113 density is 8960kg/m 3 Young's modulus of 110GPa and Poisson's ratio of 0.35.
Example 9
The invention also provides an aircraft, which adopts the plate-type electromagnetic/acoustic fusion metamaterial 11 in any one of embodiments 1 to 8.
Fig. 2 is a schematic view of an application scenario of the present invention in an aircraft. The application scenario shows an aircraft placed in a complex electromagnetic wave 12 and acoustic wave 13 environment. The electromagnetic wave 12 includes electromagnetic waves generated by an off-board antenna, radar, etc., and electromagnetic wave interference generated between the on-board devices while transmitting and receiving electromagnetic signals; the sound waves 13 are mainly excited by the engine and turbulent boundary layers, including by airborne sound and by structural sound propagating through solid structures such as the cabin walls.
The fusion metamaterial 11 provided by the invention can be conveniently placed in the structures of a cabin wall plate, a ceiling and a floor, and can regulate and control high-magnitude electromagnetic interference and vibration noise, so that the electromagnetic interference and the vibration noise are reduced.
It should be noted that, in a specific application scenario, the frequency bands of the electromagnetic wave and the acoustic wave to be regulated need to be determined in advance. And then according to the target regulation frequency band, the corresponding structure size and the construction material of the fusion metamaterial are designed, so that the electromagnetic wave and the sound wave incident on the fusion metamaterial can be accurately regulated.
Those skilled in the art will appreciate that the system components shown in fig. 2 are not limiting of the context of application of the present invention in an aircraft, and may include more or fewer components than shown, or certain components may be combined, or a different arrangement of components.
Characterization of electromagnetic wave characteristics
Referring to fig. 11, fig. 11 is an electromagnetic S parameter finite element calculation result of a single-layer fusion metamaterial provided by an embodiment of the present invention.
The S parameter is a network parameter based on the relation between incident wave and reflected wave, and in the embodiment of the invention, the S parameter is used for representing the regulation and control capability of the fusion metamaterial on electromagnetic waves. Where the S11 parameter is defined as the square root of the ratio of electromagnetic wave energy at the entrance end to the incident electromagnetic wave energy and the S21 parameter is defined as the square root of the ratio of electromagnetic wave energy at the exit end to the incident electromagnetic wave energy.
As shown in fig. 11, for the fused metamaterial basic unit shown in basic embodiment 1, the S11 parameter under the electromagnetic wave incidence condition of the TE polarization direction reaches a peak value near 0dB at 6.3GHz and 9.6GHz, and at the same time, the S21 parameter curve reaches a valley value, which indicates that the fused metamaterial basic unit shown in basic embodiment 1 can realize a near total reflection effect on the incident electromagnetic wave at the peak frequencies of 6.3GHz and 9.6 GHz.
It should be noted that the effect of the fusion metamaterial in electromagnetic wave regulation and control is not limited to the S parameter calculation result shown in the embodiment, and may also include various modulation effects such as filtering, frequency selection, and the like, which is not particularly limited herein.
Characterization of acoustic wave characteristics
Referring to fig. 12, fig. 12 is a calculation result of sound insulation finite element of a single-layer fusion metamaterial according to an embodiment of the present invention.
In the acoustic field, the sound insulation capacity of a material is often measured using the size of the sound insulation volume or transmission loss (denoted by the symbol TL). TL is defined as
T is in I Representing the transmission coefficient.
As shown in fig. 12, for the fusion metamaterial basic unit shown in basic example 1, the sound insulation amount under the condition of normal incidence of sound waves reaches a peak value of approximately 45dB at 700Hz, and excellent low-frequency sound insulation performance is shown. This effect arises because the fused metamaterial base unit shown in basic example 1 is capable of generating a strong anti-resonance vibration mode under 700Hz acoustic wave excitation, thereby forming an efficient reflection of 700Hz incident acoustic waves.
Referring to fig. 13, fig. 13 is a finite element calculation result of sound absorption coefficient of a double-layer fusion metamaterial provided by an embodiment of the present invention.
Extension example 1 was chosen here as the main subject of investigation, as shown in fig. 5, which combines two layers of the fusion metamaterial shown in base example 1 in a superimposed manner, and introduces melamine foam between the two layers of fusion metamaterial. And (3) performing finite element calculation on acoustic parameters of the melamine foam: porosity 0.995, thermal characteristic length 470 μm, viscous characteristic length 240 μm, tortuosity factor 1.0059, flow resistance 10500.
Because the fusion metamaterial shown in the two-layer basic embodiment 1 can form coupling resonance under the excitation of sound waves, the matching of input impedance and air impedance is realized, and the transmission of sound energy at the output end is avoided, so that the efficient sound absorption effect can be achieved.
The metamaterial surface equivalent impedance can be obtained from the sound pressure intensity and the moving speed of the thin plate 112, and Z=<δp>/<W'>Where p is the surface acoustic pressure intensity and W' is the membrane movement speed. The surface green function definition formula is as follows:<G>＝<W>/<δp>the equivalent impedance can thus be derived from the green function, namely: z= (-iw)<G>) -1 . Metamaterial surface equivalent the impedance expression is as follows: z is Z M ＝(-iw<G M >) -1 The cavity between the two layers adds additional impedance Z' to the system<δp>/<W'>Total impedance Z h ＝Z M +Z', thus the Green function of the system is<G h >＝(-iwZ h ) -1 . Taking G h Is used to determine the imaginary part of (c),
obviously, when Im (Z h ) When=0, im<G h >The peak value of the green function imaginary part is reached, and represents the resonance mode state, and perfect impedance matching is achieved at this time.
Under the condition of normal incidence of sound waves, the sound absorption coefficient of the material is defined as alpha=1- |T| 2 -|R| 2 Wherein T is the sound pressure transmission coefficient, and R is the sound pressure reflection coefficient.
As shown in fig. 13, the sound absorption curve of extension example 1 reaches a first sound absorption peak at 430Hz and a second sound absorption peak at 1100Hz, each of which is close to 0.76, exhibiting excellent low frequency sound absorption characteristics.
It should be noted that the effect of the fusion metamaterial in the aspect of sound wave regulation and control is not limited to the sound insulation amount and the sound absorption coefficient calculation result shown in the embodiment, and may also include various modulation effects such as filtering, frequency selection and the like, which are not particularly limited.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (10)
1. The plate-type electromagnetic/acoustic fusion metamaterial is characterized by comprising 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 and controls the sound waves incident on the acoustic functional structure, and the electromagnetic functional structure regulates and controls the electromagnetic waves incident on the acoustic functional structure.
2. The plate-type electromagnetic/acoustic fusion metamaterial according to claim 1, wherein 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), and the mass block (113) is attached to the thin plate (112) to regulate and control sound waves incident on the thin plate.
3. The plate-type electromagnetic/acoustic fusion metamaterial according to claim 2, wherein the electromagnetic functional structure comprises a conductive pattern (114), and the conductive pattern (114) is fixedly embedded on the surface of the mass block (113) to regulate and control electromagnetic waves incident on the conductive pattern.
4. The plate-type electromagnetic/acoustic fusion metamaterial according to claim 1, wherein the acoustic functional structure comprises a frame (111), a thin plate (112) and a restraint body (115), wherein the thin plate (112) is connected to the frame (111), and the thin plate (112) and the restraint body (115) are attached to regulate and control sound waves incident on the thin plate.
5. The plate-type electromagnetic/acoustic fusion metamaterial according to claim 4, wherein the electromagnetic functional structure comprises a conductive pattern (114), and the conductive pattern (114) is fixedly embedded on the surfaces of the mass block (113) and the restraint body (115) to regulate and control electromagnetic waves incident on the conductive pattern.
6. The plate electromagnetic/acoustic fusion metamaterial according to claim 3 or 5, wherein the conductive pattern (114) comprises an open loop, a spiral, a nested closed loop, a cross-tree.
7. A fusion metamaterial combination using the plate-type electromagnetic/acoustic fusion metamaterial (11) as claimed in claim 3 or 5, wherein a plurality of plate-type electromagnetic/acoustic fusion metamaterials (11) are distributed in an array.
8. The fused metamaterial combination according to claim 7, further comprising a carbonaceous porous material (116), wherein the carbonaceous porous material (116) is introduced between two adjacent layers of the fused metamaterial combination, and the performance of absorbing electromagnetic waves and sound waves is improved by the carbonaceous porous material (116).
9. The combination of plate-type electromagnetic/acoustic fusion metamaterials according to claim 7, further comprising a bending mechanism (117), wherein the bending mechanism (117) is arranged between two adjacent rows of the combination of fusion metamaterials in a strip shape or between two adjacent plate-type electromagnetic/acoustic fusion metamaterials (11), and bending is achieved through the bending mechanism (117).
10. An aircraft characterized in that a plate-type electromagnetic/acoustic fusion metamaterial according to any one of claims 1 to 6 is used.
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| CN117360026A (en) * | 2023-12-07 | 2024-01-09 | 迈默智塔(无锡)科技有限公司 | Composite material with sound insulation and electromagnetic prevention functions for building |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117360026A (en) * | 2023-12-07 | 2024-01-09 | 迈默智塔(无锡)科技有限公司 | Composite material with sound insulation and electromagnetic prevention functions for building |
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