CN114083882A - Double-layer C6v lattice metamaterial sensor based on three-dimensional metal printing technology - Google Patents
Double-layer C6v lattice metamaterial sensor based on three-dimensional metal printing technology Download PDFInfo
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Abstract
The invention discloses a double-layer C6v lattice metamaterial sensor based on a three-dimensional metal printing technology, which comprises a first periodic lattice structure, a first substrate, a second periodic lattice structure, a second substrate and a third periodic lattice structure, wherein the first periodic lattice structure, the first substrate, the second periodic lattice structure, the second substrate and the third periodic lattice structure are integrally formed by three-dimensional metal printing, and the second periodic lattice structure is arranged between the lower surface of the first substrate and the upper surface of the second substrate; the first periodic lattice structure is arranged on the upper surface of the first substrate, and the third periodic lattice structure is arranged on the lower surface of the second substrate. In the design process, the abundant physical effect in condensed state physics is ingeniously combined with the design of the traditional acoustic waveguide structure. In the condensed state physics, due to the structural periodicity and the Bragg scattering, energy is in strip distribution in the space of the reciprocal lattice vector, so that the propagation of the energy can be effectively regulated and controlled, and the signal fidelity and the signal-to-noise ratio of the traditional acoustic device are improved.
Description
Technical Field
The invention belongs to the field of continuous medium metamaterial with periodically changed elastic modulus, and particularly relates to a double-layer C6v lattice metamaterial sensor based on a three-dimensional metal printing technology.
Background
In conventional acoustically integrated devices, improving the signal fidelity and signal-to-noise ratio of the system has been a focus of attention of researchers. However, due to the processing precision error and the interference of the environmental noise, most of the acoustic signals are scattered by the defects of the acoustic device, and the environmental noise also covers the target signal to be measured. Therefore, signal distortion and low signal-to-noise ratio are always the problems to be solved by the acoustic integrated device, and overcoming the robustness of environmental noise has great limitation on the improvement of the performance of the traditional acoustic device. At the beginning of the 21 st century, scientists theoretically discovered topological phase changes and topological phase materials. At phase interfaces of different topologies, boundary states protected by the bandgap topology have defect-resistant robust transmission characteristics. In view of this, the topological phase transition theory has been widely extended from condensed state physics to the design of photoacoustic integrated devices.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to solve the technical problem of providing a double-layer C6v lattice metamaterial sensor based on a three-dimensional metal printing technology aiming at the defects of the prior art.
In order to solve the technical problem, the invention discloses a double-layer C6v lattice metamaterial sensor based on a three-dimensional metal printing technology, which comprises a first periodic lattice structure, a first substrate, a second periodic lattice structure, a second substrate and a third periodic lattice structure, wherein the first periodic lattice structure, the first substrate, the second periodic lattice structure, the second substrate and the third periodic lattice structure are integrally formed by three-dimensional metal printing, and the second periodic lattice structure is arranged between the lower surface of the first substrate and the upper surface of the second substrate; the first periodic lattice structure is arranged on the upper surface of the first substrate, and the third periodic lattice structure is arranged on the lower surface of the second substrate;
the first periodic lattice structure is symmetrical about a central axis BB 'of the first substrate, the first periodic lattice structure comprises N lattice units on the left side of the central axis BB', each lattice unit comprises a first scatterer, a second scatterer, a third scatterer and a fourth scatterer, the first scatterer, the second scatterer, the third scatterer and the fourth scatterer are sequentially arranged in a row, and the number of the first scatterer, the second scatterer, the third scatterer and the fourth scatterer in each row is M; the first scatterer and the second scatterer are longitudinally staggered, the second scatterer and the third scatterer are transversely parallel, and the third scatterer and the fourth scatterer are longitudinally staggered; the lattice unit has translation periodicity, and the fourth scatterer of the previous lattice unit and the first scatterer of the next lattice unit are transversely parallel; the first scatterer and the third scatterer have the same size, and the second scatterer and the fourth scatterer have the same size; the arrangement of the first scatterer, the second scatterer, the third scatterer, and the fourth scatterer forms a hexagonal lattice of C6 v;
the third periodic lattice structure is symmetrical about a central axis BB ', and the structure of the third periodic lattice structure on the left side of the central axis BB ' is the same as the structure of the first periodic lattice structure on the right side of the central axis BB ';
the second periodic lattice structure is arranged on the left side of the central axis BB ', the fifth scatterers are staggered in rows from the side far away from the central axis BB ' to the side close to the central axis BB ', and the number of the fifth scatterers in each row is M; the second periodic lattice structure is symmetrical about a central axis BB' of the first substrate; and mapping the first periodic lattice structure and the second periodic lattice structure to a horizontal plane where a line AA' is located, wherein a fifth scatterer can fill gaps of the first periodic lattice structure.
In one implementation manner, the number M of the first scatterer, the second scatterer, the third scatterer, and the fourth scatterer in each row in the first periodic lattice structure is set to 11, and the number N of the lattice units on one side of the central axis BB' is set to 4; the number of fifth scatterers in each row in the second periodic lattice structure is also set to M11, and the total number L of rows of fifth scatterers on the side of the central axis BB' is set to 8.
In one implementation, the first scatterer, the second scatterer, the third scatterer, the fourth scatterer and the fifth scatterer are cylindrical, and the radius ratio of the second scatterer to the first scatterer is 0.8; the first scatterer and the fifth scatterer have the same radius.
In one implementation, the thickness of the first and second substrates is 0.4a, the radius of the first scatterer is 0.25a, the radius of the second scatterer is 0.2a, and the radius of the fifth scatterer is 0.25 a; the first periodic lattice structure (1) and the third periodic lattice structure (5) each have a height of 0.27a, and the second periodic lattice structure (3) has a height of 0.15a, where a ═ 1cm is a lattice constant.
In one implementation, the first periodic lattice structure, the first substrate, the second periodic lattice structure, the second substrate, and the third periodic lattice structure are all 304 stainless steel material, and the material parameter is density 7903Kg/m3Young's modulus 219e9Pa, poisson's ratio 0.32.
In one implementation mode, an elastic wave equation is solved through a first-nature principle full wave, and the energy band distribution of the double-layer C6v lattice metamaterial sensor in the whole Brillouin zone is obtained.
In one implementation, the elastic wave equation is solved through the first-nature principle full wave, the maximum grid size is set to 1/10 of the lattice constant a in the solving process, and the three-dimensional model is set to 500000 degrees of freedom.
In one implementation mode, the double-layer C6v lattice metamaterial sensor completes forming manufacturing of a structural part in an arc additive manufacturing mode, and the size of a substrate is selected according to the size of the double-layer C6v lattice metamaterial sensor; polishing the substrate to remove a surface oxide layer, and fixing the substrate on a numerical control machine tool workbench; after the arc starts, the wire feeder synchronously feeds 304 stainless steel wire rods according to the set wire feeding speed, the machine tool moves on the horizontal plane according to the instruction of the control system according to the preset track, and when one layer is finished, the welding gun rises by a layer thickness distance along the vertical direction, so that the formation of the sensor structure is finished in a point-line-surface-body mode.
Has the advantages that: the double-layer C6v lattice metamaterial sensor based on the three-dimensional metal printing technology combines the energy band calculation and topological phase change theory of the acoustic metamaterial, ingeniously utilizes the energy band theory in condensed state physics to optimize the structural design of the traditional acoustic integrated device, and aims to improve the signal fidelity and the signal-to-noise ratio of the traditional acoustic device through structural optimization. In the condensed state physics, due to the structural periodicity and the Bragg scattering, the energy is in band-shaped distribution in the space of the reciprocal lattice vector, so that the propagation of the energy can be effectively regulated and controlled. The topological phase change of the sonometamaterial can be realized by carefully regulating and controlling the coupling strength among the cylindrical scatterers. Through the design of a double-layer structure, the elastic wave pseudo-spin mode with time reversal symmetry can be selectively excited in a wider band gap range through layers, the signal-to-noise ratio of a traditional acoustic device can be effectively improved, and a solution can be provided for the design of a novel acoustic device.
Drawings
The foregoing and/or other advantages of the invention will become further apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Fig. 1 is a perspective view of a dual-layer C6v lattice metamaterial sensor provided by the present invention.
Fig. 2 is a front view of a dual-layer C6v lattice metamaterial sensor provided by the present invention.
FIG. 3 is a top view of a dual-layer C6v lattice metamaterial sensor provided by the present invention.
FIG. 4 is a bottom view of a dual-layer C6v lattice metamaterial sensor provided by the present invention.
FIG. 5 is a cross-sectional view of a dual-layer C6v lattice metamaterial sensor provided by the present invention, taken along line AA'.
Fig. 6 is a schematic diagram of the propagation direction of the sound wave excited by the symmetric linear sound source in the double-layer C6v lattice metamaterial sensor provided by the present invention.
Figure 7 is a schematic diagram of a unit cell structure including two first scatterers and an energy band diagram.
Fig. 8 is a schematic diagram of a unit cell structure including a first scatterer and a second scatterer and an energy band diagram of a double-layer C6v lattice metamaterial sensor provided by the invention.
Fig. 9 is a schematic diagram of a corresponding super cell structure of a top view of a double-layer C6v lattice metamaterial sensor provided by the present invention.
Fig. 10 is a schematic view of a superlattice structure corresponding to a lower view of a dual-layer C6v lattice metamaterial sensor provided in the present invention.
Fig. 11 is a band diagram of the supercell of fig. 9 and 10.
FIG. 12 is a finite element simulation experimental verification of an intrinsic symmetry mode of a double-layer C6v lattice metamaterial sensor provided by the invention.
FIG. 13 is a finite element simulation experimental verification of the intrinsic antisymmetric mode of the double-layer C6v lattice metamaterial sensor provided by the invention.
The reference numbers in the figures illustrate: a first periodic lattice structure 1, a first substrate 2, a second periodic lattice structure 3, a second substrate 4, a third periodic lattice structure 5, a lattice unit 10, a first scatterer 11, a second scatterer 12, a third scatterer 13, a fourth scatterer 14, and a fifth scatterer 31.
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings.
The double-layer C6v lattice metamaterial sensor based on the three-dimensional metal printing technology can be applied to an acoustic integrated device, and the signal fidelity and the signal-to-noise ratio of the acoustic integrated device are improved.
As shown in fig. 1 to 2, a two-layer C6v lattice metamaterial sensor based on a three-dimensional metal printing technology according to an embodiment of the present application includes a first periodic lattice structure 1, a first substrate 2, a second periodic lattice structure 3, a second substrate 4, and a third periodic lattice structure 5 integrally formed by three-dimensional metal printing, where the second periodic lattice structure 3 is disposed between a lower surface of the first substrate 2 and an upper surface of the second substrate 4; the first periodic lattice structure 1 is arranged on the upper surface of the first substrate 2, and the third periodic lattice structure 5 is arranged on the lower surface of the second substrate 4;
as shown in fig. 3, the first periodic lattice structure 1 is symmetrical with respect to a central axis BB 'of the first substrate 2, the first periodic lattice structure 1 includes N lattice units 10 on the left side of the central axis BB', the lattice units 10 include a first scatterer 11, a second scatterer 12, a third scatterer 13, and a fourth scatterer 14, the first scatterer 11, the second scatterer 12, the third scatterer 13, and the fourth scatterer 14 are sequentially arranged in a row, and the number of the first scatterer 11, the second scatterer 12, the third scatterer 13, and the fourth scatterer 14 in each row is M; the first scatterer 11 and the second scatterer 12 are arranged in a longitudinally staggered manner, the second scatterer 12 and the third scatterer 13 are arranged in a transverse manner, and the third scatterer 13 and the fourth scatterer 14 are arranged in a longitudinally staggered manner; the lattice unit 10 has a translational periodicity, and the fourth scatterer 14 of the previous lattice unit 10 and the first scatterer 11 of the next lattice unit 10 are transversely arranged in parallel; the first scatterer 11 and the third scatterer 13 are the same in size, and the second scatterer 12 and the fourth scatterer 14 are the same in size;
as shown in fig. 2 and 4, the third periodic lattice structure 5 is symmetrical with respect to the central axis BB ', and the structure of the third periodic lattice structure 5 on the left side of the central axis BB ' is the same as the structure of the first periodic lattice structure 1 on the right side of the central axis BB ';
as shown in fig. 5, the second periodic lattice structure 3 is located on the left side of the central axis BB ', and the fifth scatterers 31 are staggered in rows from the side far away from the central axis BB ' to the side close to the central axis BB ', where the number of the fifth scatterers 31 in each row is M; the second periodic lattice structure 3 is symmetrical about a central axis BB' of the first substrate 2; the first periodic lattice structure 1 and the second periodic lattice structure 3 are mapped onto a horizontal plane on which a line AA' is located, and the fifth scatterer 31 can fill a gap of the first periodic lattice structure 1.
The left and right sides are described only for describing the relative relationship of scatterers in the first, third and second periodic lattice structures 1, 5 and 3, and the arrangement direction of the two-layer C6v lattice metamaterial sensor based on the three-dimensional metal printing technology includes, but is not limited to, the arrangement directions shown in fig. 1 to 6.
In this embodiment, as shown in fig. 3 and 5, the number M of the first scatterer 11, the second scatterer 12, the third scatterer 13, and the fourth scatterer 14 in each row of the first periodic lattice structure 1 is set to 11, and the number N of the lattice units 10 on one side of the central axis BB' is set to 4; the number M of the fifth scatterers 31 in each row in the second periodic lattice structure 3 is also set to 11, and the total number L of the rows of the fifth scatterers 31 on the side of the central axis BB' is set to 8.
In this embodiment, the first scatterer 11, the second scatterer 12, the third scatterer 13, the fourth scatterer 14, and the fifth scatterer 31 are cylindrical, and the radius ratio of the second scatterer 12 to the first scatterer 11 is 0.8; the first scattering body 11 and the fifth scattering body 31 have the same radius.
In this embodiment, the thickness of the first substrate 2 and the second substrate 4 is 0.4a, the radius of the first scatterer 11 is 0.25a, the radius of the second scatterer 12 is 0.2a, and the radius of the fifth scatterer 31 is 0.25 a; the first periodic lattice structure (1) and the third periodic lattice structure (5) each have a height of 0.27a, and the second periodic lattice structure (3) has a height of 0.15a, where a ═ 1cm is a lattice constant.
In this embodiment, the first periodic lattice structure 1, the first substrate 2, the second periodic lattice structure 3, the second substrate 4, and the third periodic lattice structure 5 are all made of 304 stainless steel, and the material parameter is a density of 7903Kg/m3Young's modulus 219e9Pa, poisson's ratio 0.32.
In the embodiment, an elastic wave equation is solved through a first principle full wave, and the energy band distribution of the double-layer C6v lattice metamaterial sensor in the whole Brillouin zone is obtained. Since the elastomer metamaterial is composed of scatterers with periodically-changed elastic modulus and density, the lattice structure with the translational periodicity can cause the elastic energy to be distributed in a belt shape due to Bragg scattering. Elastic energy corresponding to the band gap frequency cannot propagate in the material. The use of such a material allows effective control of the propagation of acoustic waves.
Due to the periodic lattice structure, parameters such as density, Lame constant and displacement in the elastomer wave equation can be expanded in the form of plane waves in the reciprocal lattice vector space, so that the solution of the partial differential equation is converted into the solution process of characteristic values in the characteristic equation.
In the elastic wave system, the wave equation is of the form:
the resonant frequency omega corresponding to each wave loss k in the reciprocal lattice vector space, namely the energy band of the elastic wave phononic crystal, can be obtained by solving the formula (1) into a characteristic equation and solving the characteristic equation.
In this embodiment, the elastic wave equation is solved through the full wave of the first principle, and in the solving process, 1/10 with the maximum grid size being the lattice constant a is set, and 500000 degrees of freedom are set for the three-dimensional model.
In this embodiment, the double-layer C6v lattice metamaterial sensor completes the formation and manufacture of the structural member by an arc additive manufacturing method. Before the material additive manufacturing and forming of the structural component, the proper size of the substrate is selected according to the size of the structural component. And polishing the substrate to remove a surface oxide layer, and fixing the substrate on a numerical control machine tool workbench. After the arc starts, the wire feeder synchronously feeds 304 stainless steel wire rods according to the set wire feeding speed, the machine tool moves on the horizontal plane according to the instruction of the control system according to the preset track, and when one layer is finished, the welding gun rises by a layer thickness distance along the vertical direction, so that the formation of the sensor structure is finished in a point-line-surface-body mode. In this embodiment, the wire feeding speed is set to be 40-60 mm/s, the predetermined trajectory includes a three-dimensional model of a dual-layer C6v lattice metamaterial sensor, and the first periodic lattice structure 1, the first substrate 2, the second periodic lattice structure 3, the second substrate 4, and the third periodic lattice structure 5 are respectively one layer.
The left side of fig. 7 and fig. 8 are schematic diagrams of two unit cell structures, and the unit cell structure of the double-layer C6v lattice metamaterial sensor is the structure shown in the left side of fig. 7 and the structure shown in the left side of fig. 8. The upper and lower surfaces of the unit cell are free boundaries, the periphery is periodic boundaries, the corresponding diatomic radius ratio is 1 (two parallel scatterers near the central axis BB' on both sides of the first periodic lattice structure 1 and the third periodic lattice structure 5) and 0.8 (the second scatterer 12 and the first scatterer 11, or the fourth scatterer 14 and the third scatterer 13, or the second scatterer 12 and the third scatterer 13, or the fourth scatterer 14 of the previous lattice unit 10 and the first scatterer 11 of the next lattice unit 10) are respectively as in the right half of fig. 7 and 8, the ordinate represents frequency, the abscissa represents wave vector K, the bandwidth range of fig. 7 and 8 is 160-inch-180 kHz, Γ, K, and M on the abscissa wave vector K represent high symmetry points of the energy band diagram, the shaded part in fig. 8 is a band gap due to bragg scattering of the periodic structure, the center frequency of the band gap corresponds to the lattice constant a of the periodic structure.
Fig. 9 to 11 are a super cell of a two-layer metamaterial sensor according to the present invention, which refers to the structure shown in the upper diagram of fig. 9 and the upper diagram of fig. 10, and a projection energy band thereof. In order to verify the topological boundary mode, the sonotrode with two different topological numbers is spliced to form a topological non-plain interface, namely the topological numbers on two sides of the central axis BB' in FIG. 3 are different. As shown in fig. 6, the periphery of the sensor employs an absorption boundary condition to prevent the generation of additional boundary modes inside the band gap, and is set as a periodic boundary along the interface direction, and a vertical interface is set as an absorption boundary to prevent the generation of standing waves. When the ratio of the radii of the diatoms in the unit cell is changed from 1 to 0.8, the corresponding projected energy bands and structures are as shown in fig. 11, 10 and 9, respectively, where fig. 10 corresponds to the 1 mode in fig. 11 and fig. 9 corresponds to the 2 mode in fig. 11. It can be seen that when the symmetry of the spatial inversion is broken, as in fig. 11, an omnidirectional bandgap opens up at the k ═ pi/a point. This omnidirectional bandgap reorganizes the boundary modes in the quantum spin hall effect, i.e., the parity of the boundary states flips.
FIG. 12 is a simulation experiment of a symmetric boundary pattern of a two-layer metamaterial sensor in accordance with the present invention. A symmetric linear acoustic source along the direction of propagation was located near the upper boundary of the sample with an excitation frequency of 174.5kHz, corresponding to mode 1 in fig. 11. The upper layer of the two-layer sensor is shown on the left side of fig. 12, and the lower layer of the two-layer sensor is shown on the right side of fig. 12.
FIG. 13 is a simulation experiment of an antisymmetric boundary mode of the two-layer metamaterial sensor of the present invention. The source of the anti-symmetric linear sound along the direction of propagation is located near the upper boundary of the sample and the excitation frequency is 171.5kHz, corresponding to the 2 mode in fig. 11. The upper layer of the two-layer sensor is shown on the left side of fig. 13, and the lower layer of the two-layer sensor is shown on the right side of fig. 13.
As can be seen from fig. 12 and 13, the double-layer C6v lattice metamaterial sensor based on the three-dimensional metal printing technology provided by this embodiment can effectively regulate and control energy propagation, and has good signal fidelity and signal-to-noise ratio.
The invention provides a concept of a double-layer C6v lattice metamaterial sensor based on three-dimensional metal printing technology, and a method and a way for implementing the technical scheme are many, the above description is only a specific embodiment of the invention, it should be noted that, for those skilled in the art, a plurality of improvements and embellishments can be made without departing from the principle of the invention, and these improvements and embellishments should also be regarded as the protection scope of the invention. All the components not specified in the present embodiment can be realized by the prior art.
Claims (8)
1. The double-layer C6v lattice metamaterial sensor based on the three-dimensional metal printing technology is characterized by comprising a first periodic lattice structure (1), a first substrate (2), a second periodic lattice structure (3), a second substrate (4) and a third periodic lattice structure (5) which are integrally formed by three-dimensional metal printing, wherein the second periodic lattice structure (3) is arranged between the lower surface of the first substrate (2) and the upper surface of the second substrate (4); the first periodic lattice structure (1) is arranged on the upper surface of the first substrate (2), and the third periodic lattice structure (5) is arranged on the lower surface of the second substrate (4);
the first periodic lattice structure (1) is symmetrical about a central axis BB 'of a first substrate (2), the first periodic lattice structure (1) comprises N dot matrix units (10) on the left side of the central axis BB', each dot matrix unit (10) comprises a first scatterer (11), a second scatterer (12), a third scatterer (13) and a fourth scatterer (14), the first scatterer (11), the second scatterer (12), the third scatterer (13) and the fourth scatterer (14) are sequentially arranged in a row, and the number of the first scatterer (11), the second scatterer (12), the third scatterer (13) and the fourth scatterer (14) in each row is M; the first scatterer (11) and the second scatterer (12) are longitudinally staggered, the second scatterer (12) and the third scatterer (13) are transversely parallel, and the third scatterer (13) and the fourth scatterer (14) are longitudinally staggered; the lattice unit (10) has translation periodicity, and a fourth scatterer (14) of the previous lattice unit (10) and a first scatterer (11) of the next lattice unit (10) are transversely arranged in parallel; the first scatterer (11) and the third scatterer (13) are the same in size, and the second scatterer (12) and the fourth scatterer (14) are the same in size;
the third periodic lattice structure (5) is symmetrical about a central axis BB ', and the structure of the third periodic lattice structure (5) on the left side of the central axis BB ' is the same as the structure of the first periodic lattice structure (1) on the right side of the central axis BB ';
the second periodic lattice structure (3) is arranged on the left side of the central axis BB ', the fifth scatterers (31) are staggered in rows from the side far away from the central axis BB ' to the side close to the central axis BB ', and the number of the fifth scatterers (31) in each row is M; the second periodic lattice structure (3) is symmetrical about a central axis BB' of the first substrate (2); and mapping the first periodic lattice structure (1) and the second periodic lattice structure (3) to a horizontal plane on which a line AA' is positioned, wherein a fifth scatterer (31) can fill gaps of the first periodic lattice structure (1).
2. The two-layer C6v lattice metamaterial sensor based on three-dimensional metal printing technology as claimed in claim 1, wherein the number M of the first scatterer (11), the second scatterer (12), the third scatterer (13) and the fourth scatterer (14) in each column of the first periodic lattice structure (1) is set to be 11, and the number N of the lattice units (10) on one side of the central axis BB' is set to be 4; the number of fifth scatterers (31) per row in the second periodic lattice structure (3) is also set to M11, and the total number L of rows of fifth scatterers (31) on the side of the central axis BB' is set to 8.
3. The two-layer C6v lattice metamaterial sensor based on three-dimensional metal printing technology as claimed in claim 1, wherein the first scatterer (11), the second scatterer (12), the third scatterer (13), the fourth scatterer (14) and the fifth scatterer (31) are cylindrical, and the radius ratio of the second scatterer (12) to the first scatterer (11) is 0.8; the first scattering body (11) and the fifth scattering body (31) have the same radius.
4. The two-layer C6v lattice metamaterial sensor based on three-dimensional metal printing technology as claimed in claim 3, wherein the thickness of the first substrate (2) and the second substrate (4) is 0.4a, the radius of the first scatterer (11) is 0.25a, the radius of the second scatterer (12) is 0.2a, and the radius of the fifth scatterer (31) is 0.25 a; the first periodic lattice structure (1) and the third periodic lattice structure (5) each have a height of 0.27a, and the second periodic lattice structure (3) has a height of 0.15a, where a ═ 1cm is a lattice constant.
5. The dual-layer C6v lattice metamaterial sensor based on three-dimensional metal printing technology as claimed in claim 1, wherein the first periodic lattice structure (1), the first substrate (2), the second periodic lattice structure (3), the second substrate (4) and the third periodic lattice structure (5) are all made of 304 stainless steel materials, and the material parameter is density 7903Kg/m3Young's modulus 219e9Pa, poisson's ratio 0.32.
6. The double-layer C6v lattice metamaterial sensor based on the three-dimensional metal printing technology as claimed in claim 4, wherein the elastic wave equation is solved through a first principle full wave, and energy band distribution of the double-layer C6v lattice metamaterial sensor in the whole Brillouin zone is obtained.
7. The two-layer C6v lattice metamaterial sensor based on three-dimensional metal printing technology as claimed in claim 6, wherein elastic wave equation is solved through full wave of first nature principle, the maximum grid size is set to be 1/10 of lattice constant a, and 500000 degrees of freedom are set in three-dimensional model during solving.
8. The double-layer C6v lattice metamaterial sensor based on three-dimensional metal printing technology as claimed in claim 1, wherein the double-layer C6v lattice metamaterial sensor is manufactured by arc additive manufacturing, and the size of the substrate is selected according to the size of the double-layer C6v lattice metamaterial sensor; polishing the substrate to remove a surface oxide layer, and fixing the substrate on a numerical control machine tool workbench; after the arc starts, the wire feeder synchronously feeds 304 stainless steel wire rods according to the set wire feeding speed, the machine tool moves on the horizontal plane according to the instruction of the control system according to the preset track, and when one layer is finished, the welding gun rises by a layer thickness distance along the vertical direction, so that the formation of the sensor structure is finished in a point-line-surface-body mode.
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