Sawtooth-shaped unit cell-fan-shaped thin plate coupled single sensor vibration identification reverse design coding metasurface

Abstract

The invention relates to a single sensor vibration identification reverse design coding metasurface with coupled zigzag unit cells and fan-shaped thin plates, and belongs to the technical field of vibration positioning identification. Comprising a semicircular partition plate, a vibration signal receiver, a fan-shaped thin plate and metasurface unit cells. The number of the partition plates is two, and the partition plates are arranged in a crossed mode. A vibration signal receiver is arranged at the bottom of the intersection of the two partition plates; at least three fan-shaped thin plates are arranged in each receiving space; the tail end part of the fan-shaped thin plate is connected with the vibration signal receiver; a mounting hole is formed in each fan-shaped thin plate, and metasurface unit cells are arranged in the mounting holes at intervals. According to the invention, the metasurface unit cells are arranged on the plurality of fan-shaped thin plates, so that the metasurface unit cells are arranged in a three-dimensional manner, elastic waves transmitted from different directions can be effectively received, and the device can meet the requirements of a complex three-dimensional wave field.

Description

Technical Field

[0001] This invention relates to the field of vibration location recognition technology, and in particular to a single-sensor vibration recognition reverse design encoded metasurface coupled with a sawtooth-shaped unit cell-fan-shaped thin plate. Background Technology

[0002] Traditional vibration location identification methods mainly include techniques such as coherence function analysis, blind source separation, and array signal processing. However, these traditional methods all require a large number of sensors and complex acquisition systems and control circuits. This not only makes vibration signal location identification extremely costly, but also limits the accuracy of subsequent location identification due to the complex layout.

[0003] Metamaterials are artificial composite materials with unique physical properties not found in natural materials (such as negative equivalent mass and negative equivalent modulus). Metamaterials bring disruptive new ideas to the localization and identification of elastic waves (vibrations). Specifically, the microstructure units of metamaterials are designed as "sensing units" or "computing units". When elastic waves pass through or interact with these metamaterials, their wavefront shape, propagation direction, or spectral characteristics are directly encoded and preprocessed by the physical structure of the metamaterial. By analyzing the simple response signal at the output end of the metamaterial, the location and characteristics of the wave source can be directly mapped, thereby realizing vibration localization and identification. This enables lighter, more integrated, real-time, and low-power structural health monitoring and intelligent sensing, which is a cutting-edge research direction in the fields of intelligent manufacturing, the Internet of Things, and national security.

[0004] Existing sensing units made of metamaterials for positioning and identification have an overall serpentine flat strip structure. Their use for elastic wave identification and positioning is limited to two-dimensional planes and cannot meet the requirements of some complex three-dimensional wave fields. Summary of the Invention

[0005] To address or partially address the problems existing in related technologies, this invention provides a single-sensor vibration recognition reverse-engineered coded metasurface coupled with a serrated unit cell and a fan-shaped thin plate. This aims to solve the technical problem that existing metamaterial sensing units cannot meet the requirements for recognition and positioning in complex three-dimensional wave fields.

[0006] A single-sensor vibration recognition reverse-engineered coded metasurface coupled with a sawtooth-shaped unit cell and a fan-shaped thin plate includes a semi-circular partition plate, a vibration signal receiver, a fan-shaped thin plate, and a metasurface unit cell.

[0007] There are two partition plates arranged in a cross shape to form four receiving spaces; a vibration signal receiver is provided at the bottom of the intersection of the two partition plates.

[0008] Each receiving space contains at least three fan-shaped thin plates, and the fan-shaped thin plates are arranged in a circular array with the vibration signal receiver as the center; the middle part of each fan-shaped thin plate is connected to the vibration signal receiver.

[0009] Each of the aforementioned fan-shaped thin plates is provided with mounting holes, and metasurface unit cells are arranged at intervals within the mounting holes.

[0010] In some schemes, the tooth width is c1, the inner groove width is c2, the outer groove width is c3, the tooth profile length is L, the tooth height of the middle tooth is h1, and the tooth height of the teeth on both sides is the same, which is h2.

[0011] 1.4mm < (c1, c3) < 1.6mm;

[0012] 1.6mm < (h1, h2) < 7.6mm;

[0013] mm <c2< mm.

[0014] In some schemes, three of the aforementioned sector-shaped thin plates are provided within each of the receiving spaces;

[0015] The three fan-shaped thin plates form angles of 0°, 30°, and 60° with the bottom surface of the partition plate, respectively.

[0016] In some embodiments, 10 metasurface unit cells are disposed within the mounting holes of the fan-shaped thin plate at a 0° angle;

[0017] Eight metasurface unit cells are provided in the mounting holes of the fan-shaped thin plate at a 30° angle;

[0018] Six metasurface unit cells are disposed within the mounting holes of the fan-shaped thin plate at a 60° angle. Within a limited size range, the presence of more unit cells reduces the correlation between mutual signals.

[0019] In some schemes, the phase shift and transmittance of the vibration signal after being modulated by the metasurface unit cell 4 on the same size fan-shaped thin plate 3 are different.

[0020] In some schemes, the metasurface units 4 on the same size sector plate 3 are not exactly the same or completely different.

[0021] In some schemes, h1 and h2 of any metasurface unit cell 4 are randomly selected from 1.6 mm to 7.6 mm.

[0022] The technical solution provided by this invention may include the following beneficial effects:

[0023] This application arranges metasurface unit cells on multiple fan-shaped thin plates in a three-dimensional manner, enabling the effective reception of elastic waves propagating from different directions. This allows the device to meet the requirements of complex three-dimensional wave fields. Furthermore, the data encoded by this application exhibits low correlation, which reduces the difficulty of subsequent data analysis and effectively improves positioning efficiency.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0025] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0026] Figure 1 This is a schematic diagram of the structure of the coded metasurface shown in an embodiment of the present invention;

[0027] Figure 2 This is an experimental diagram illustrating the vibration correlation of the encoded metasurface as shown in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of a metasurface unit cell for encoding metasurfaces, as shown in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the metasurface unit cell arrangement of the encoded metasurface shown in an embodiment of the present invention.

[0030] Figure label:

[0031] 1. Separator; 2. Vibration signal receiver; 3. Fan-shaped thin plate; 4. Metasurface unit cell. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited to the content described.

[0033] like Figure 1 As shown, this application provides a single-sensor vibration recognition reverse design coding metasurface coupled with a sawtooth unit cell-fan-shaped thin plate, including a semi-circular partition plate 1, a vibration signal receiver 2, a fan-shaped thin plate 3, and a metasurface unit cell 4.

[0034] There are two partition plates 1 arranged in a cross shape, with their bottoms on the same plane, thus forming four receiving spaces; a vibration signal receiver 2 is provided at the bottom of the intersection of the two partition plates 1.

[0035] Each receiving space is provided with at least three fan-shaped thin plates 3, and the fan-shaped thin plates 3 are arranged in a ring array with the vibration signal receiver 2 as the center. At the same time, the outer circumferential surface of the fan-shaped thin plates 3 and the circumferential surface of the partition plate 1 are on the same virtual hemisphere surface; the tail of any fan-shaped thin plate 3 is connected to the vibration signal receiver 2 respectively.

[0036] Each of the fan-shaped thin plates 3 is provided with mounting holes, and metasurface units 4 are arranged at intervals in the mounting holes. The fan-shaped thin plates 3 and the metasurface units 4 are integrally formed and manufactured, that is, the metasurface units 4 are directly processed on the fan-shaped thin plates 3.

[0037] When collecting vibration signals, a hemispherical hole is excavated on the solid surface, and the device is placed inside the hole with the top of the fan-shaped thin plate 3 in contact with the inner wall of the hole. When the elastic wave propagates along the solid to the hole, it is received by the fan-shaped thin plate 3 and causes the fan-shaped thin plate 3 to vibrate, which is then received by the metasurface unit cell 4. In this way, the metasurface unit cell 4 effectively receives elastic waves from different directions, effectively overcoming the technical deficiency of existing sensing units that can only collect signals in two dimensions.

[0038] Subsequently, the metasurface unit cell 4 encodes and preprocesses the elastic wave and transmits the relevant signal to the vibration signal receiver 2. The vibration signal receiver 2 transmits the relevant signal to an external computer, and the vibration signal characteristics can be reconstructed through calculation, thereby realizing the location and identification of the elastic wave.

[0039] This application arranges the metasurface unit cell 4 on multiple fan-shaped thin plates 3, and arranges the fan-shaped thin plates 3 in a ring array with the vibration signal receiver 2 as the center, so that the metasurface unit cell 4 is arranged in a three-dimensional shape, so that elastic waves transmitted from different directions in space can be effectively received, enabling the device to meet the requirements of complex three-dimensional wave fields and realize vibration identification and positioning in space.

[0040] In this embodiment, the fan-shaped thin plates 3 are arranged in a circular array from left to right or from bottom to top with the vibration signal receiver 2 as the center.

[0041] In some implementations, such as Figure 2 As shown, the metasurface unit cell 4 includes connecting plates 41 at both ends and three serrations 42;

[0042] Among them, the tooth width is c1, the inner groove width is c2, the outer groove width is c3, the tooth profile length is L, the tooth height of the middle tooth is h1, and the tooth height of the teeth on both sides is the same, which is h2.

[0043] 1.4mm < (c1, c3) < 1.6mm;

[0044] 1.6mm < (h1, h2) < 7.6mm;

[0045] mm <c2< mm;

[0046] By setting the above parameters, the phase transition coverage of metasurface unit cell 4 is effectively ensured to be 2π.

[0047] In some embodiments, each of the receiving spaces is provided with three of the fan-shaped thin plates 3;

[0048] The three fan-shaped thin plates 3 form angles of 0°, 30°, and 60° with the bottom surface of the partition plate 1, respectively.

[0049] During identification and positioning, the device is able to receive elastic waves from different directions. Simultaneously, as different elastic waves propagate, the metasurface unit cells 4 on different sector-shaped thin plates 3 have different angles with the elastic waves, resulting in different vibration codes and thus receiving different signals. This allows the device to simultaneously receive multiple vibration signals. In subsequent signal processing, the different signals exhibit high uncorrelation, thereby reconstructing the original signals of different elastic waves. This enables vibration identification when multiple elastic waves are simultaneously excited, facilitating the positioning and identification of elastic waves when multiple vibration sources are simultaneously excited.

[0050] In some embodiments, 10 metasurface units 4 are provided in the mounting holes of the fan-shaped thin plate 3 at a 0° angle;

[0051] Eight metasurface units 4 are provided in the mounting holes of the fan-shaped thin plate 3, which are at a 30° angle;

[0052] Six metasurface units 4 are provided in the mounting holes of the fan-shaped thin plate 3, which is at a 60° angle.

[0053] Within a limited size range, more metasurface unit cells 4 are set, which can reduce the correlation between encoded vibration signals. Furthermore, the even number of metasurface unit cells 4 can form a more balanced stress distribution within a limited size range, and make the arrangement of the phase encoding sequence more flexible, further reducing the correlation between encoded vibration signals, thereby optimizing the accuracy and efficiency of vibration positioning.

[0054] In some implementations, such as Figure 3 As shown, the phase shift and transmittance of the vibration signal after being modulated by the metasurface unit cell 4 on the same size fan-shaped thin plate 3 are different.

[0055] Specifically, the metasurface units 4 on the same-sized sector-shaped thin plates 3 are not entirely identical or completely different. This results in different phase combinations of the metasurface units 4 on different sector-shaped thin plates 3. This characteristic provides a richer coding dimension for vibration coding, which helps to construct more independent coding patterns in spatial vibration coding. This improves the uncorrelation between signals, thereby facilitating subsequent signal analysis and ultimately enabling more precise and multi-directional elastic wave localization and identification.

[0056] More specifically, h1 and h2 of any metasurface unit cell 4 are randomly selected in the range of 1.6 mm to 7.6 mm.

[0057] This design represents more variable structural parameters, which is conducive to realizing more combinations of phase shift and transmittance of the coded metasurface unit cell. This provides more possibilities for vibration coding. In spatial vibration coding, it is possible to design more coded metasurfaces that can perform uncorrelated coding, and it provides the possibility of extending the vibration coding of two-dimensional plane to three-dimensional space, which can realize the location and identification of elastic waves in more directions.

[0058] This device was used to perform a vibration signal reconstruction experiment:

[0059] In this experimental setup, each receiving space is equipped with three sector-shaped thin plates 3, meaning the entire setup consists of a total of 12 sector-shaped thin plates 3.

[0060] The experimental procedure was as follows: a vibration source was placed at the outer end of each sector-shaped thin plate 3, and the vibration sources were excited. The vibration signals after being encoded by the metasurface unit cell 4 were collected and tabulated to obtain the results. Figure 4 The vibration correlation table shown (in the table, the numbers on the X and Y axes are the numbers of the 12 sector-shaped thin plates 3) shows that the vibration signal of each sector-shaped thin plate 3 has a high correlation with itself, while the correlation with other sector-shaped thin plates 3 is weak. Therefore, in this application, after different sector-shaped thin plates 3 receive elastic waves and encode them, the correlation of the encoded data is very small, which helps to construct an ideal compression sensing measurement matrix and thus quickly analyze the location of the signal source.

[0061] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A single-sensor vibration recognition reverse-engineering encoded metasurface coupled with a serrated unit cell and a fan-shaped thin plate, characterized in that: It includes a semi-circular partition plate (1), a vibration signal receiver (2), a fan-shaped thin plate (3), and a metasurface unit cell (4). There are two partition plates (1) arranged in a cross shape to form four receiving spaces; a vibration signal receiver (2) is provided at the bottom of the intersection of the two partition plates (1). Each receiving space is provided with at least three fan-shaped thin plates (3), and the fan-shaped thin plates (3) are arranged in a ring array with the vibration signal receiver (2) as the center; the tail of the fan-shaped thin plates (3) is connected to the vibration signal receiver (2) respectively; Each of the aforementioned sector-shaped thin plates (3) is provided with mounting holes, and metasurface unit cells (4) are arranged at intervals within the mounting holes.

2. The single-sensor vibration recognition reverse design coding metasurface coupled with a serrated unit cell-fan-shaped thin plate according to claim 1, characterized in that: in, The tooth width is c1, the inner groove width is c2, the outer groove width is c3, the tooth profile length is L, the tooth height of the middle tooth is h1, and the tooth height of the teeth on both sides is the same, which is h2; 1.4mm < (c1, c3) < 1.6mm. 6mm < (h1, h2) < 7.6mm; mm<c2< mm。 3. The single-sensor vibration recognition reverse design coding metasurface coupled with a serrated unit cell-fan-shaped thin plate according to claim 1, characterized in that: Each of the receiving spaces is provided with three of the aforementioned fan-shaped thin plates (3); The three fan-shaped thin plates (3) are respectively at angles of 0°, 30° and 60° to the bottom surface of the partition plate (1).

4. The single-sensor vibration recognition reverse design coding metasurface coupled with a serrated unit cell-fan-shaped thin plate according to claim 3, characterized in that: Ten metasurface units (4) are provided in the mounting holes of the fan-shaped thin plate (3) which is at a 0° angle. Eight metasurface units (4) are provided in the mounting holes of the fan-shaped thin plate (3) which is at a 30° angle. The mounting holes of the fan-shaped thin plate (3) at a 60° angle are provided with 6 metasurface units (4).

5. The single-sensor vibration recognition reverse design coding metasurface coupled with a serrated unit cell-fan-shaped thin plate according to claim 1, characterized in that: The phase shift and transmittance of the vibration signal after being modulated by the metasurface unit cell (4) on the same size fan-shaped thin plate (3) are different.

6. The single-sensor vibration recognition reverse-engineering coded metasurface coupled with a serrated unit cell-fan-shaped thin plate according to claim 5, characterized in that: The metasurface units (4) on the same size sector thin plate (3) are not exactly the same or completely different.

7. The single-sensor vibration recognition reverse-engineering coded metasurface coupled with a serrated unit cell-fan-shaped thin plate according to claim 6, characterized in that: h1 and h2 of any metasurface unit cell (4) are randomly selected in the range of 1.6 mm to 7.6 mm.

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