CN115833651A - Vibration energy collecting device based on defect topological metamaterial beam - Google Patents
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Abstract
The invention discloses a vibration energy collecting device based on a defect topology metamaterial beam, and mainly solves the problems of poor anti-interference capability and low output power of the conventional metamaterial vibration energy collecting device. The scheme comprises the following steps: the topological metamaterial beam comprises a topological metamaterial beam, local defects, a piezoelectric element and an energy collecting circuit. The topological metamaterial beam consists of two sub-beams, namely an A beam and a B beam. The A beam is composed of four type I unit cells, and the B beam is composed of four type II unit cells. Through the structural design of the class I unit cell and the class II unit cell, the topological metamaterial beam has a boundary state at the junction of the beam A and the beam B, vibration energy is converged at the boundary, and the vibration energy is converted into electric energy by using the piezoelectric element and the energy collecting circuit. The purpose of placing local defects at the boundaries is to improve the vibration energy harvesting efficiency. The invention has the characteristics of strong anti-interference and high output power, and has the capability of efficiently and stably collecting the environmental vibration energy.
Description
Technical Field
The invention belongs to the technical field of energy collection, relates to a vibration energy collecting device, and particularly relates to a vibration energy collecting device based on a defect topology metamaterial beam, which has high anti-jamming capability and high output power.
Background
With the continuous development of infinite sensing technology and micro-electro-mechanical system technology, wireless sensors and small portable electronic devices are used on an increasing scale. At present, most of the energy supply technologies for wireless sensors and small portable electronic devices are mainly based on battery technologies, and mainly include fuel cells, thin film batteries, and the like. The technology has the characteristics of mature production process, high energy density, simple use and the like, but the service life of the traditional battery is limited relative to the service life of working equipment, and in some application occasions, the replacement or charging of the battery is a task with high cost and sometimes even impossible. Meanwhile, a large amount of waste batteries may cause serious environmental pollution. New energy supply technologies need to be developed to accommodate the development of microelectronic devices.
In natural environments, vibrations are ubiquitous, such as the travel of vehicles, the operation of machinery, and the like. Harvesting ambient vibrational energy to power wireless sensors or small electronic devices has been widely studied and finds particular application. Currently, there are three ways to convert vibrational energy into electrical energy: electromagnetic induction, electrostatic effects, and piezoelectric effects, among which piezoelectric energy harvesting techniques have gained more attention. The main reason is that compared with the other two types of conversion mechanisms, the piezoelectric energy collection technology has the advantages of simple structure, high energy density and convenient integration with micro devices. The traditional piezoelectric type energy collecting device is very sensitive, the piezoelectric sheet is easy to damage under severe vibration so as to influence the energy collecting function of the traditional piezoelectric type energy collecting device, and partial structural defects can seriously influence the energy collecting efficiency of the traditional piezoelectric type energy collecting device.
An acoustic metamaterial is a precisely manipulated artificially fabricated composite material. In recent years, it has become a new medium for realizing energy collection as an artificial material which can periodically modulate sound waves and has an acoustic band gap. From the viewpoint of energy collection, compared with natural materials, the metamaterial has the potential of energy collection due to the unique physical properties including local resonance band gaps, local defect immunity, elastic wave concentration and the like. At present, researches on an acoustic metamaterial vibration energy collector show that the energy gathering effect of the metamaterial on elastic waves is obviously superior to that of a traditional piezoelectric energy collecting device. However, energy collection systems based on metamaterial structures are very sensitive to defects (such as structural damage and fatigue), and local defects can significantly affect the effect of energy concentration, and even lose the energy concentration function in severe cases. Thus, the local defect may cause a significant reduction in the output power of the metamaterial energy collection system, thereby reducing the energy collection efficiency. Therefore, how to improve the robustness of the metamaterial energy collection technology is a key problem which needs to be solved urgently at present.
In recent years, due to the fact that the topological metamaterial has the characteristic of topological protection and is insensitive to local defects, the topological metamaterial has a wide application prospect in the aspects of efficient transmission, regulation and control of waves and the like, and gradually becomes a popular research field. Among them, the boundary state of the topological edge body has attracted wide attention of scholars. The topologically protected boundary states are immune to lattice defects, which are important for stable propagation and concentration of elastic waves. Therefore, the boundary states of topological metamaterials is a very promising solution for achieving robust and reliable vibrational energy harvesting.
Disclosure of Invention
The invention discloses a vibration energy collecting device based on a defect topology metamaterial beam, and mainly solves the problems of poor anti-interference capability and low output power of the conventional metamaterial vibration energy collecting device. In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a vibration energy collection device based on a defect topological metamaterial beam comprises: the topological metamaterial beam comprises a topological metamaterial beam, a defect part, a piezoelectric element and an energy collecting circuit; the topological metamaterial beam is formed by fixedly connecting a left sub-beam and a right sub-beam (namely a beam A and a beam B), wherein the beam A consists of four type I unit cells, and the beam B consists of four type II unit cells.
The class I unit cells are divided into five sections with the same width, all are W c The total length of the class I unit cell L =30mm. Wherein the length of the first section of cuboid to the fifth section of cuboid respectively is: l 1 、l 2 、l 3 、l 4 、l 5 The first and fifth segments are the same length (i.e. /) 1 ＝l 5 ) Second, secondThe length of the segment is identical to that of the fourth segment and is constant (i.e. |) 2 ＝l 4 ) And thus the third segment may be l in length 3 ＝L－2l 1 －2l 2 . The heights of the first section, the third section and the fifth section are all the same, and h is used a Represents; and the second and fourth sections are of the same height, using h b And (4) showing.
The class II unit cells are all W with the same width of five sections c The total length of the class II unit cell is the same as that of the class I unit cell, and the total length of the class II unit cell is L =30mm. Wherein the length of first section cuboid to fifth section cuboid is respectively:
the first and fifth segments are the same length (i.e., the first and fifth segments are of the same length)
) The length of the second segment is identical to that of the fourth segment and is constant (i.e. constant)
) And therefore the length of the third segment is
The heights of the first section, the third section and the fifth section are all the same, and are calculated by h a Represents; and the second and fourth sections are of the same height, using h b And (4) showing.
The defective portion is located on an upper surface of a joint of the left-half a-beam and the right-half B-beam. The length, width and height of the defect portion are respectively l c 、W c 、h c . The length of the defect does not exceed
The width of the beam is equal to the width W of the topological metamaterial beam c (ii) a Defect height not exceeding h a . The extent of the defect is achieved primarily by varying the size of the defect, such as by increasing the height or length of the defect.
A piezoelectric portion mainly composed of a piezoelectric element and an energy collecting circuit, the piezoelectric element being located at the defective portion (6)On the other side, the length, width and height of the piezoelectric element are respectively l d 、W d 、h d . Through the design of the class I unit cell and the class II unit cell, the topological metamaterial beam can generate a boundary state at the joint of the left half part A beam and the right half part B beam (namely, the fifth section of the class I unit cell and the first section of the class II unit cell), vibration energy is converged at the boundary, and the vibration energy is converted into electric energy through the piezoelectric element and the energy collecting circuit, wherein the energy collecting circuit can be a resistor or other complex circuits. .
According to the vibration energy collecting device based on the defect topological metamaterial beam, when the topological metamaterial beam vibrates under the action of external excitation, the piezoelectric sheet is deformed due to the bending deformation of the beam. The piezoelectric sheet converts mechanical energy into electric energy through a piezoelectric effect and provides the electric energy for a load circuit. When the load circuit is a resistor, the electric energy of the piezoelectric sheet is consumed; when the load circuit is a tank circuit, the electrical energy is stored in the circuit. Through the structural design of the class I single cells and the class II single cells, the topological characteristics of the class I single cells and the class II single cells are different, so that the boundary state of the whole topological metamaterial beam at the joint of the beam A and the beam B can be ensured, the vibration energy is converged at the boundary, and the vibration energy is converted into electric energy through the piezoelectric element and the energy collecting circuit. Because the defect topological metamaterial beam has the topological protection characteristic and the efficient energy convergence characteristic, the defect topological metamaterial beam has the characteristics of strong interference resistance and high output power, and has the capability of efficiently and stably collecting environmental vibration energy.
Compared with the prior art, the invention has the beneficial effects that:
the topological metamaterial is applied to the piezoelectric vibration energy collection technology, and the vibration energy collection with the defect immunity function is realized. The research result is expected to provide theoretical basis and design basis for the topological metamaterial piezoelectric vibration energy collection system, and a new method is provided for further realizing stable and reliable vibration energy collection.
Drawings
FIG. 1 is a schematic diagram of a possible structure provided by an embodiment of the present invention;
FIG. 2 is a graph of the size parameters of a class I unit cell;
FIG. 3 is a graph of the size parameters of a class II unit cell;
FIG. 4 is a schematic diagram of local defects and piezoelectric patch position dimensions;
FIG. 5 is a band diagram of the dispersion relation of the cell structure;
FIG. 6 is a diagram showing the influence of unit length on dispersion relation;
FIG. 7 is a graph of defect-free topological metamaterial transfer characteristics and energy harvesting voltage;
FIG. 8 is a graph of defective topological metamaterial transfer characteristics and energy harvesting voltage;
the topological metamaterial beam-type piezoelectric resonator comprises a 1-topological metamaterial beam, a 2-left half part A beam, a 3-right half part B beam, a 4-I type unit cell, a 5-II type unit cell, a 6-local defect, a 7-piezoelectric element and an 8-energy collecting circuit.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts throughout, or parts having the same or similar functions. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In this embodiment, a vibration energy collecting device based on a beam made of a metamaterial and having defects is specifically provided, as shown in fig. 1, where: the topological metamaterial beam comprises a topological metamaterial beam 1, a left half part A beam 2 and a right half part B beam 3 of the topological metamaterial beam 1, a local defect 6, a piezoelectric part 7 and an energy collecting circuit 8. Specifically, the method comprises the following steps: the topological metamaterial beam 1 comprises a base, a left half-part beam A2 and a right half-part beam B3, wherein the left half-part beam A and the right half-part beam B are fixedly connected to the base; the leftmost end of the left half part A beam 2 is connected with the base, and the rightmost end of the right half part B beam 3 is a free end; the left half portion A beam 2 and the right half portion B beam 3 both comprise four unit structures, the unit structures of the left half portion A beam 2 and the right half portion B beam 3 are different, the left half portion A beam 2 comprises four class I unit cells, and the right half portion B beam 3 comprises four class II unit cells, as shown in FIG. 1.
The I type unit cells 4 are divided into five sections with the same width, and are all W c The total length L =30mm of the class I unit cell 4. Wherein the length of first section cuboid to fifth section cuboid is respectively: l 1 、l 2 、l 3 、l 4 、l 5 The first and fifth segments are the same length (i.e. /) 1 ＝l 5 ) The length of the second segment is identical to that of the fourth segment and is constant (i.e. |) 2 ＝l 4 ) And thus the third segment has a length l 3 ＝L－2l 1 －2l 2 . The heights of the first section, the third section and the fifth section are the same, and h is used a Represents; and the second and fourth sections are of the same height, using h b And (4) showing. The specific dimensions are shown in fig. 2. The specific dimensional values of the above parameters in this example are shown in table 1.
TABLE 1.I class Unit cell size Table
The II type unit cells 5 have the same width from five sections, and are all W c The total length of the class II unit cell 5 is the same as that of the class I unit cell 4, and L =30mm is provided. Wherein the length of first section cuboid to fifth section cuboid is respectively:
the first and fifth segments are the same length (i.e., the first and fifth segments are of the same length)
) The length of the second segment is identical to that of the fourth segment and is constant (i.e. constant)
) And therefore the length of the third segment is
The heights of the first section, the third section and the fifth section are all the same, and are calculated by h a Represents; and the second and fourth sections are of the same height, using h b And (4) showing. The specific dimensions are shown in fig. 3. The specific dimensional values of the above parameters in this example are shown in table 2.
TABLE 2 class II Unit cell size Table
Through the structural design of the class I unit cell 4 and the class II unit cell 5, the class I unit cell 4 and the class II unit cell 5 have different topological characteristics, so that the whole topological metamaterial beam 1 can have boundary states at the junction of the left half part A beam 2 and the right half part B beam 3, vibration energy is converged at the boundaries, and the vibration energy is converted into electric energy through the piezoelectric element (7) and the energy collecting circuit 8.
The defect portion 6 is shown in fig. 1, and is located on the upper surface of the joint of the left-half a-beam 2 and the right-half B-beam 3. The specific size of the defect is shown in FIG. 4, and the length, width and height of the defect are l c 、W c 、h c . The defect sizes used in this example are shown in table 3.
TABLE 3 Defect part size table
The piezoelectric part mainly comprises a piezoelectric element 7 and an energy collecting circuit 8, the piezoelectric element 7 is positioned on the other side of the defect part 6, and the specific size of the piezoelectric element 7 is shown in figure 4The length, width and height of the piezoelectric element are respectively l d 、W d 、h d . Where the piezoelectric element 7 is connected to an external energy harvesting circuit 8, the energy harvesting circuit 8 may be a resistor or other complex circuit. The piezoelectric sheet used in this example was PZT-5H, and the specific dimensions are shown in table 4.
TABLE 4 piezoelectric element size table
Compared with the conventional metamaterial vibration energy collecting device, the metamaterial vibration energy collecting device with the defects, which is composed of the topological metamaterial beam 1, the local defects 6, the piezoelectric elements 7 and the energy collecting circuit 8, has the characteristics of strong interference resistance and high output power, and has the capability of efficiently and stably collecting environmental vibration energy.
The vibration energy collecting device based on the defect topological metamaterial beam is characterized in that the design method of the device is as follows:
s1: a model of a unit structure is established by using COMSOL finite element software, the structure size and material parameters are set, and the beam is made of structural steel.
S2: applying periodic boundary conditions to the unit structures 4 and 5 of the beams A and B, and maintaining the total length L, height and width W of the unit c The second section (l) is kept unchanged 2 And
) And a fourth stage (l) 4 And
) The length of the microstructure is not changed, and the length (l) of the microstructure in the third section is calculated 3 Or
) Law of influence on the dispersion relation of the whole cell structure, where L =30mm, note: the lengths of the first section and the fifth section are kept consistentAnd varies with the length of the third segment.
S3: based on the rule of the influence of the microstructure unit length on the dispersion relation, a mode inversion curve graph can be obtained, as shown in fig. 7. Wherein, the position where the two curves intersect is the mode turning point, and the corresponding length is the critical length l 0 As can be seen from FIG. 7, in the structure shown herein, l 0 =8mm. According to the influence rule of unit length on dispersion relation, along with l 3 Is increased, the band gap is closed and reopened, when 3 <When the thickness is 8mm, the part with larger first-order modal deformation of the unit cell structure is concentrated in the middle part and is an anti-symmetric structure, and the part with larger second-order modal deformation is concentrated at the two ends and is a symmetric structure; when l is 3 >When the thickness is 8mm, the symmetry of the first-order mode and the second-order mode is reversed, the part with larger first-order modal deformation of the unit cell structure is concentrated at two ends and is a symmetrical structure, and the part with larger second-order modal deformation is concentrated in the middle area and is an anti-symmetrical structure. l 3 >l 0 Corresponding microstructure and 3 <l 0 the corresponding microstructures have different topological properties. To ensure that the a-beams 2 and B-beams 3 have different topological properties, in the arrangement shown herein, the third section length l of the class I unit cell 4 is chosen 3 <l 0 (taking l 3 =2 mm), the third section length of the class II unit cell 5 is selected
(getting
). In order to improve the energy collection efficiency, topological boundary states are constructed by respectively setting l 3 =2mm and
class I unit cells 4 and class II unit cells 5 were designed. The number of the units of the left half A beam 2 and the right half B beam 3 is 10. And obtaining the transfer rate of the defect-free topological metamaterial through simulation. FIG. 7 shows the defect-free topological metamaterial transfer rate and displacement response distribution. First, the band gap is observed in the transmittance plot, and the bandTopological boundary states are observed inside the slots. According to the transmission rate image and the displacement response distribution diagram of the topological metamaterial, two resonance peaks exist in a band gap, but only the resonance peak with f =2620Hz is a boundary state. To illustrate these characteristics, a displacement profile is plotted, as shown in FIG. 7. When f =2620Hz, a boundary state occurs at the junction of the a beam 2 and the B beam 3, where the elastic wave is concentrated, at which the energy collection efficiency is highest. The external circuit resistance R =10M Ω employed in the present embodiment calculates the voltage distribution in the band-forbidden region, as shown in fig. 7 (e). As can be seen from fig. 7 (e), the voltage is 365V at the maximum when f =2620 Hz.
S4: to improve energy collection efficiency, topological boundary states with defects are constructed. Are respectively provided with l 3 =2mm and
class I unit cells 4 and class II unit cells 5 were designed. The local defect 6 as shown in fig. 4 was set, and the specific dimensions are shown in table 3. The number of the units of the left half A beam 2 and the right half B beam 3 is 10. And obtaining the transfer rate of the topological metamaterial through simulation. FIG. 7 shows the transfer rate and displacement response distribution of the topological metamaterial with defects. First, a band gap is observed in the transmittance map, and a topological boundary state is observed inside the band gap. According to the transfer rate image and the displacement response distribution diagram of the topological metamaterial, two resonance peaks exist in a band gap, but only the resonance peak with f =2532Hz is a boundary state. To illustrate these characteristics, a displacement profile is plotted, as shown in FIG. 8. When f =2532Hz, a boundary state occurs at the junction of the a beam 2 and the B beam 3, where the elastic wave is concentrated, at which the energy collection efficiency is highest. As with the defect-free topological metamaterial piezoelectric energy collector, the external circuit resistance R =10M Ω adopted in the present embodiment calculates the voltage distribution in the band-forbidden region at this time, as shown in fig. 8 (e). As can be seen from fig. 8 (e), the voltage is maximum at 532V when f =2532 Hz.
Compared with a piezoelectric energy collector without defects, the voltage of the topological metamaterial energy collecting system with defects is remarkably improved to be about 46%. Therefore, the energy collecting efficiency of the piezoelectric energy collector with defects is higher than that of the piezoelectric energy collector without defects, and in addition, compared with the conventional metamaterial vibration energy collecting device, the metamaterial vibration energy collector with defects has the characteristics of strong interference resistance and high output power, and has the capability of efficiently and stably collecting the environmental vibration energy
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (5)
1. A vibration energy collecting device based on a defect topological metamaterial beam is characterized by comprising a topological metamaterial beam (1), a defect part (6) and a piezoelectric part;
the topological metamaterial beam (1) comprises a base, a left half-part beam A (2) and a right half-part beam B (3), wherein the left half-part beam A and the right half-part beam B are fixedly connected to the base; the leftmost end of the beam (2) of the left half part A is connected with the base, and the rightmost end of the beam (3) of the right half part B is a free end;
the left half part A beam (2) and the right half part B beam (3) both comprise four unit structures, the respective unit structures of the left half part A beam (2) and the right half part B beam (3) are different, and the left half part A beam (2) comprises four class I unit cells (4); the right half part B beam (3) comprises four class II unit cells (5); the class I unit cell (4) consists of five sections with the width of W c The total length L =30mm of the class I unit cell (4); wherein the length of first section cuboid to fifth section cuboid is respectively: l. the 1 、l 2 、l 3 、l 4 、l 5 The first and fifth segments are of the same length, i.e. /) 1 ＝l 5 (ii) a The length of the second section is identical to that of the fourth section and is constant, i.e. | 2 ＝l 4 (ii) a The length of the third segment is the remaining length of the total length minus the other segment lengths, i.e. /) 3 ＝L－2l 1 －2l 2 (ii) a The heights of the first section, the third section and the fifth section are all the same, and h is used a Represents; and a second section and a fourth sectionAre the same in height, with h b Represents;
the class II unit cell (5) consists of five sections with the width of W c The total length of the class II unit cell (5) is the same as that of the class I unit cell (4), and the total length of the class II unit cell and the class I unit cell are both L =30mm; wherein the length of first section cuboid to fifth section cuboid is respectively:
the first and fifth segments are of the same length, i.e.
The length of the second section and the fourth section are identical and constant, i.e.
The length of the third segment is thus the remaining length of the total length minus the other segment lengths, i.e. the total length
The heights of the first section, the third section and the fifth section are all the same, and are calculated by h a Represents; and the second and fourth sections are of the same height, using h b Represents; the defect part (6) is positioned at the joint of the left half part A beam (2) and the right half part B beam (3), namely the defect part (6) is arranged on the upper surface of the first section of the type I unit cell (4) and the type II unit cell (5): length, width and height are respectively 1 c 、W c 、h c (ii) a The length l of the defect part (6) c Not exceeding
The width of the defect part (6) is equal to the width W of the topological metamaterial beam c ；
The height h of the defect part (6) c No more than h a ；
The piezoelectric part comprises a piezoelectric element (7) and an energy collecting circuit (8); the topological metamaterial beam (1) is in a boundary state at the joint of the left half part A beam (2) and the right half part B beam (3), namely the fifth section of the class I unit cell (4) and the first section of the class II unit cell (5) by aiming at the class I unit cell (4) and the class II unit cell (5), the vibration energy is converged at the boundary, and the vibration energy is converted into electric energy through the piezoelectric element (7) and the energy collecting circuit (8).
2. The vibration energy collection device based on the defect topological metamaterial beam of claim 1, wherein a modal inversion graph is obtained based on the rule of influence of the length of the microstructure unit on the dispersion relation; the position of intersection in the modal inversion curve chart is the modal inversion point, and the corresponding length is the critical length l 0 Under the condition that the left half part A beam (2) and the right half part B beam (3) have different topological characteristics, the length l of the third section of the I-type unit cell (4) 3 <l 0 Third segment length of class II unit cell (5)
3. The vibration energy collection device based on the defect topological metamaterial beam as claimed in claim 1, wherein the piezoelectric element (7) is located on the other side of the defect portion (6), namely on the lower surface of the joint of the left half portion A beam (2) and the right half portion B beam (3), and the length, width and height of the piezoelectric element (7) are respectively l d 、W d 、h d (ii) a Wherein the piezoelectric element (7) is connected with an external energy collecting circuit (8), and the energy collecting circuit (8) can be a resistor or other complex circuits.
4. The vibration energy collecting device based on the defect topological metamaterial beam as claimed in claim 1, wherein when the topological metamaterial beam (1) vibrates under the action of external excitation, the piezoelectric sheet is deformed by the bending deformation of the topological metamaterial beam (1); the piezoelectric element (7) of the piezoelectric part converts mechanical energy into electric energy through piezoelectric effect and provides the electric energy for a load circuit; when the load circuit is a resistor, the electric energy of the piezoelectric sheet is consumed; when the load circuit is a tank circuit, the electrical energy is stored in the circuit.
5. The vibration energy collection device based on the defect topological metamaterial beam according to any one of claims 1 to 4, wherein the device is prepared by a method comprising the following steps:
s1: establishing a model of a unit structure by using COMSOL finite element software, and setting the structure size and material parameters;
s2: applying periodic boundary conditions to the type I unit cells (4) and the type II unit cells (5) and keeping the total length L, the height and the width W of the unit cells c The second section l is kept unchanged 2 And
and a fourth section l 4 And
the length of the microstructure is not changed, and the length l of the microstructure in the third section is calculated 3 Or
The rule of influence on the dispersion relation of the whole unit structure; the lengths of the first section and the fifth section are still consistent and are changed along with the change of the length of the third section;
s3: obtaining a modal flip curve chart based on the influence rule of the length of the microstructure unit on the dispersion relation; wherein, the position where the two curves intersect is the mode turning point, and the corresponding length is the critical length l 0 : for l 3 <l 0 The part with larger first-order modal deformation of the unit cell structure is concentrated in the middle of the unit cell and is in an anti-symmetric structure, and the part with larger second-order modal deformation is concentrated at two ends of the unit cell and is in a symmetric structure; for l 3 >l 0 The left half part of the single cell structure is a symmetrical structure with the larger part of the first-order modal deformation concentrated at the two ends of the single cell, and the larger part of the second-order modal deformation concentrated in the middle of the single cell and is an anti-symmetrical structure. Thus l 3 >l 0 Corresponding microstructure and 3 <l 0 the corresponding microstructure hasDifferent topological properties; under the condition that the left half part A beam (2) and the right half part B beam (3) have different topological characteristics, the length l of a third section of the class I unit cell (4) is selected 3 <l 0 Third segment length of class II unit cell (5)
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990168A (en) * | 2017-03-29 | 2017-07-28 | 浙江大学 | A kind of Structure Damage Identification and system |
| CN107968599A (en) * | 2017-11-22 | 2018-04-27 | 浙江大学 | Using the electricity energy harvester and method of the double localization characteristics of the beam of phonon crystal containing defect |
| CN111259592A (en) * | 2020-01-20 | 2020-06-09 | 湖南工业大学 | Vibration energy collection piezoelectric metamaterial sheet material topology optimization method |
| CN111756273A (en) * | 2020-06-01 | 2020-10-09 | 上海大学 | Slot type piezoelectric energy collector for collecting human body kinetic energy |
| CN112285205A (en) * | 2020-11-03 | 2021-01-29 | 浙江大学 | Defect detection method for constructing periodic structure beam |
| CN113531022A (en) * | 2021-07-26 | 2021-10-22 | 天津大学 | Active control local resonance metamaterial device for low-frequency vibration isolation |
| CN114647962A (en) * | 2022-03-16 | 2022-06-21 | 中国人民解放军国防科技大学 | Low-frequency elastic metamaterial high-order topological insulator and application |
| CN115473455A (en) * | 2022-09-02 | 2022-12-13 | 哈尔滨工程大学 | Vibration damping and power generation dual-function device based on symmetrical multi-layer piezoelectric metamaterial |
-
2022
- 2022-12-16 CN CN202211624664.6A patent/CN115833651B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990168A (en) * | 2017-03-29 | 2017-07-28 | 浙江大学 | A kind of Structure Damage Identification and system |
| CN107968599A (en) * | 2017-11-22 | 2018-04-27 | 浙江大学 | Using the electricity energy harvester and method of the double localization characteristics of the beam of phonon crystal containing defect |
| CN111259592A (en) * | 2020-01-20 | 2020-06-09 | 湖南工业大学 | Vibration energy collection piezoelectric metamaterial sheet material topology optimization method |
| CN111756273A (en) * | 2020-06-01 | 2020-10-09 | 上海大学 | Slot type piezoelectric energy collector for collecting human body kinetic energy |
| CN112285205A (en) * | 2020-11-03 | 2021-01-29 | 浙江大学 | Defect detection method for constructing periodic structure beam |
| CN113531022A (en) * | 2021-07-26 | 2021-10-22 | 天津大学 | Active control local resonance metamaterial device for low-frequency vibration isolation |
| CN114647962A (en) * | 2022-03-16 | 2022-06-21 | 中国人民解放军国防科技大学 | Low-frequency elastic metamaterial high-order topological insulator and application |
| CN115473455A (en) * | 2022-09-02 | 2022-12-13 | 哈尔滨工程大学 | Vibration damping and power generation dual-function device based on symmetrical multi-layer piezoelectric metamaterial |
Non-Patent Citations (1)
| Title |
|---|
| CHUNBO LAN: "Energy localization and topological protection of a locally resonant topological metamaterial for robust vibration energy harvesting", 《JOURNAL OF APPLIED PHYSICS》, pages 1 - 13 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118551666A (en) * | 2024-07-26 | 2024-08-27 | 华中科技大学 | Structural parameter optimization method of metamaterial energy collector |
| CN118551666B (en) * | 2024-07-26 | 2024-10-01 | 华中科技大学 | Structural parameter optimization method of metamaterial energy collector |
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