CN113883200A - Local resonance elastic wave metamaterial device with active control function and method - Google Patents
Local resonance elastic wave metamaterial device with active control function and method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
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- F16F2224/02—Materials; Material properties solids
- F16F2224/0283—Materials; Material properties solids piezoelectric; electro- or magnetostrictive
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
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Abstract
The invention discloses a local resonance elastic wave metamaterial device with an active control function and a method thereof, wherein the device comprises a base plate, connecting rods, local oscillators and piezoelectric patches, the connecting rods are uniformly distributed on the base plate, the upper part and the lower part of each connecting rod are mutually symmetrical based on the base plate, the upper end and the lower end of each connecting rod are connected with the local oscillators, the upper part and the lower part of each connecting rod are respectively provided with the piezoelectric patches, each piezoelectric patch is connected with an external negative capacitor circuit, and finally, the local resonance elastic wave metamaterial capable of being actively regulated and controlled is formed together.
Description
Technical Field
The invention relates to the technical field of artificial elastic wave metamaterial, in particular to a local resonance elastic wave metamaterial device with an active control function and a method.
Background
Modern equipment development requires low vibration and low noise environments. The excessive vibration and noise seriously affect the working performance, reliability, efficiency and the like of the equipment. The nature of vibration and noise in structures/materials is propagated in the form of elastic waves. Therefore, the regulation of the elastic wave behavior in the structure/material is an effective means for realizing the control of the vibration and acoustic characteristics of the equipment. The local resonance elastic wave metamaterial has good low-frequency vibration isolation characteristics, so that the local resonance elastic wave metamaterial draws wide attention.
Most of the previous elastic wave metamaterials related to local resonance do not have the capability of active control, and under certain specific frequencies, the metamaterials can well realize the vibration isolation effect, but in the field of practical engineering application, the vibration frequency is often changed, so that the conditions met by vibration isolation and noise reduction of the metamaterials are very limited, and the vibration isolation effect on different vibration frequencies needs to be completed by changing and reconstructing a model. Even so, the manpower and material resources spent are huge.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a local resonance elastic wave metamaterial device with an active control function and a method thereof.
The purpose of the invention is realized by the following technical scheme:
the utility model provides a local resonance elastic wave metamaterial device with active control function, includes base plate, connecting rod, local oscillator and piezoelectric patches, even distribution is provided with the connecting rod on the base plate, and the upper portion and the lower part of every connecting rod are based on the mutual symmetry of base plate, and the upper and lower both ends of every connecting rod all are connected with local oscillator, and the upper portion and the lower part of every connecting rod all are equipped with the piezoelectric patches, and every piezoelectric patches all links to each other with external negative capacitance circuit, finally constitutes the local resonance type elastic wave metamaterial that can carry out the initiative regulation and control jointly.
Furthermore, the piezoelectric sheet is a PZT-5H piezoelectric sheet, the inherent elastic modulus of the piezoelectric sheet is 80GPa and can be adjusted through an external negative capacitance circuit.
Furthermore, the connecting rods are of cuboid structures, piezoelectric patches are attached to the front side and the rear side of the upper portion of each connecting rod and the front side and the rear side of the lower portion of each connecting rod, and the width of each piezoelectric patch is the same as that of each connecting rod.
Furthermore, the connecting rods are periodically arranged on the base plate in an 8 × 8 mode, and the finally formed local resonance elastic wave metamaterial device is of a periodic structure and has frequency forbidden bands and passband characteristics of elastic waves and vibration.
The invention also provides an experimental method of the local resonance elastic wave metamaterial device with the active control function, which comprises the following steps:
(1) the two vertex angles at one side of the base plate are provided with holes and connected with fishing lines, the base plate is suspended through the fishing lines, and the two fishing lines for suspending the base plate are equal in length;
(2) the bottom edge of the suspended base plate is clamped by a clamp and connected with a vibration exciter;
(3) the vibration exciter excites different frequencies, and data obtained by vibration of different frequencies are recorded and analyzed.
Furthermore, the local resonance elastic wave metamaterial device is used for active control vibration isolation in the frequency range of 900 Hz-1400 Hz.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the device applies the negative capacitance circuit to adjust the equivalent Young modulus of the piezoelectric sheet to realize active regulation and control of the local resonance band gap, and further achieves the vibration isolation effect of bending waves with different frequencies.
2. According to the vibration isolation device, the negative capacitance circuit is connected, the piezoelectric sheet is attached to the connecting rod, and the equivalent Young modulus of the piezoelectric sheet is regulated and controlled through the negative capacitance circuit, so that the vibration isolation effect on different vibration frequencies can be realized only by changing the parameters of the circuit without changing materials. Therefore, the active control of the two-dimensional local resonance band gap is realized on the basis of the two-dimensional local resonance forbidden band characteristic.
3. The local oscillators are periodically arranged on the two sides of the base plate, so that a plurality of forbidden bands appear on the structure under low-frequency vibration, and low-frequency vibration isolation is better realized. Then, frequency domain analysis of the single cell characteristic frequency and the whole elastic wave metamaterial composed of the single cells shows that the vibration isolation effect can be realized within the frequency range of the vibration forbidden band.
4. The metamaterial model is an upper local oscillator and a lower local oscillator, so that the local resonance band gap becomes more obvious, a better vibration isolation and noise reduction effect can be obtained in practice, and damage to equipment and the like is less.
Drawings
FIGS. 1 and 2 are front and top views, respectively, of an actively-controlled localized resonant metamaterial device provided in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of a unit cell structure constituting a periodic model of a local resonance metamaterial device according to an embodiment of the present invention;
fig. 4 is a schematic perspective view of a local resonance elastic wave metamaterial device according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a negative capacitor according to an embodiment of the present invention;
FIG. 6a shows that the equivalent Young's modulus of the piezoelectric sheet provided by the embodiment of the present invention is 80 × 109A frequency response diagram at Pa;
FIG. 6b shows that the equivalent Young's modulus of the piezoelectric sheet provided by the embodiment of the present invention is 110 × 109A frequency response diagram at Pa;
FIGS. 7a and 7b show experimental data for an experimental measurement of 900 Hz;
fig. 8a and 8b show experimental data obtained when 1400Hz is measured.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
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.
Through the design of geometric parameters of the model, the frequency intervals with different forbidden bands of the metamaterial model can be selected when the equivalent Young modulus of the piezoelectric sheet changes, so that the vibration isolation effect under different frequencies is met. The equivalent Young modulus of the piezoelectric sheet is regulated and controlled through the negative capacitance circuit, so that the internal parameters of the model are changed, and the active control of the band gap characteristic of the local resonance metamaterial is realized. The invention not only meets the local resonance condition, but also realizes the active control of the bending wave vibration isolation effect of the local resonance band gaps with different frequencies.
The embodiment of the invention relates to a local resonance elastic wave metamaterial device with an active control function, which comprises the following steps: when the frequency of the vibration changes, the equivalent Young modulus of the piezoelectric sheet is changed by adjusting the circuit parameters according to the result of the numerical simulation, and the effect of forbidden band adjustment is achieved at the frequency.
As shown in fig. 1 to 4, a structure of a metamaterial waveguide device for actively controlling bending waves according to an embodiment of the present invention includes: the piezoelectric resonator comprises a base plate 1, a piezoelectric sheet 2, a negative capacitance circuit 5, a connecting rod 3 and a local oscillator 4. The base plate 1 is white photosensitive resin material plate structure, even distribution is provided with connecting rod 3 on the base plate 1, the upper portion and the lower part of every connecting rod are based on base plate mutual symmetry in this embodiment, the upper and lower both ends of every connecting rod all are connected with local oscillator 4, piezoelectric patches 2 are all pasted to the upper portion and the lower part of every connecting rod, negative capacitance circuit 5 is all connected alone to every piezoelectric patches 2, constitute the local resonance type elastic wave metamaterial device that can carry out initiative regulation and control jointly finally.
Hang on the platform that shakes through the fish tape in the experimentation, the base plate passes through anchor clamps and is connected with the vibration exciter, and is concrete, and two corner department drilling of base plate one side are hung by the fish tape and are played, will guarantee after tying that the length of fish tape equals except that the department of knoing, can guarantee like this that the upper portion level of base plate is put. And the other side of the elastic wave metamaterial is clamped by a clamp and connected with a vibration exciter, PZT-5H piezoelectric sheets are adhered to two sides of each spring, the base plate is connected with the local oscillator, and each piezoelectric sheet is connected with a negative capacitor circuit to form the local resonance type elastic wave metamaterial capable of being actively regulated and controlled. The fixture is fixed on the lower edge of the base plate through the bolt and the nut, the fixture is provided with a hole, the diameter of the hole is the same as that of the nut, and the fixture is mainly used for being matched with a vibration exciter to excite bending waves to perform experimental tests.
The negative capacitance circuit 5 connected with each piezoelectric sheet 2 can adjust the equivalent elastic modulus of the local resonance type elastic wave metamaterial device to realize active regulation and control of frequency band gap. In the present embodiment, the connecting rods are periodically arranged on the base plate at 8 × 8 intervals, and the formed local resonance elastic wave metamaterial device has a periodic structure and has a frequency band gap and pass band characteristics of elastic waves and vibration
Fig. 5 is a schematic diagram of a negative capacitance circuit, which is a circuit form commonly applied in the active control function, has a good regulation function, and has a plurality of connection modes. The obvious difference between the structure and other resonant circuits is the connection of an amplifier, the positive pole of the circuit is connected with the negative input end of the amplifier, the positive input end is grounded, and R is2The sliding rheostat can change circuit parameters by adjusting the size of the sliding rheostat, so that the equivalent modulus of the piezoelectric sheet is changed, and the purpose of actively controlling the forbidden band characteristic of the local resonance elastic wave metamaterial is achieved.
The negative capacitance circuit in the device is mainly used for adjusting the resistance R1And R2The equivalent elastic modulus of the piezoelectric sheet in the structure is actively regulated and controlled by the ratio of (A) to (B). The equivalent elastic modulus of the piezoelectric sheet under simple harmonic vibration is
Where Z is the complex impedance of the circuit, where Z is 1/(- α × C) in a negative capacitance circuitpXs), wherein α ═ R (R)2×C0)/(R1×Cp)，C0Is externally connected with a capacitor, CpIs the equivalent capacitance of the piezoelectric patch.
The working principle of the local resonance elastic wave metamaterial device with the active control function in the embodiment of the invention comprises the following steps:
the piezoelectric sheets and the local oscillators connected with the upper part and the lower part of each connecting rod on the base plate are regarded as single cell structures, and the single cell structures and the corresponding piezoelectric sheets are arranged periodically, so that forbidden bands or band gaps exist in the process of transmitting bending waves, when elastic waves or vibration frequencies are located in the forbidden band range, vibration is excited on one section of the base plate, and fluctuation or vibration signals cannot be received on the other end of the base plate, so that the effects of vibration isolation and noise reduction are achieved. The piezoelectric sheet is connected with the negative capacitor circuit to realize active control of the local resonance unit, and the internal equivalent parameters of the elastic wave metamaterial are changed by adjusting the circuit parameters to adjust the position and the width of a forbidden band, so that the vibration isolation and noise reduction effects are achieved.
FIGS. 6a and 6b show the results of band gap characteristics calculated in the numerical software, from which it can be seen that the forbidden band is changed after the piezoelectric sheet is attached to the link member as compared with the case where the piezoelectric sheet is not attached, and FIGS. 6a and 6b respectively show that the equivalent Young's modulus of the piezoelectric sheet is 80X 109Pa、110×109Pa, the position interval of the forbidden band can be changed at the moment, so that the aim of adjusting the vibration isolation of different frequencies by active control is fulfilled.
The experimental process comprises the following steps: firstly, designing a metamaterial device in the aspects of geometry and material on numerical software to enable the metamaterial device to be formed by arranging and combining unit cells in an 8 x 8 mode; secondly, 3D printing is carried out on the metamaterial device, and meanwhile, the piezoelectric plate is processed according to the size; then, piezoelectric sheets are attached to the front side and the back side of a rod piece connected with the local oscillator, and after each piezoelectric sheet is connected with a negative capacitance circuit, the equivalent Young modulus of the piezoelectric sheet can be changed by changing the resistance, so that the internal parameters of the metamaterial can be changed. In the experiment, the vibration exciter excites different frequencies, and data obtained by the vibration of different frequencies are recorded and analyzed: and analyzing after obtaining the data to obtain: the effect of active control is more evident at 900Hz and 1400Hz, fig. 7a is the data result when 900Hz is not energized, and fig. 7b is the data result when 900Hz is energized; fig. 8a is the data result when 1400Hz is not electrified, and fig. 8b is the data result when 1400Hz is electrified, it can be observed that the two positions are basically consistent with the simulated condition, the reduction height of the amplitude value when electrified reaches about half, the effect is obvious, and the active control vibration isolation effect of the device is better under a certain frequency.
In summary, compared with the conventional periodic vibration isolation device, the device of the embodiment of the invention adopts the active control system consisting of the piezoelectric sheet and the negative capacitance circuit to adjust the equivalent young modulus of the piezoelectric sheet in the local resonance metamaterial.
The device simulates and tests the forbidden band effect of the bending wave under different frequencies, can adjust different frequency intervals of the bending wave into forbidden band areas by adjusting circuit parameters, and has active control characteristic easy to adjust due to the action of the negative capacitance circuit.
The whole device consists of a photosensitive resin 3D printing plate, piezoelectric ceramics, various circuit elements and a clamp. The required instrument of this structure and material are simple, easily processing, are convenient for simultaneously assemble the experiment test.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments, and the improvement and optimization of the invention. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, they are described in relative terms, as long as they are described in partial descriptions of method embodiments. And more description is provided for model settings of a control system and a dual-local oscillator. The above-described embodiments of the apparatus and system are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of ordinary skill in the art will understand that: the components in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be correspondingly changed in one or more devices different from the embodiments. The components of the above embodiments may be combined into one component, or may be further divided into a plurality of sub-components.
The above description is only a preferred embodiment of the present invention, but the effect of the present invention on vibration isolation is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Those of ordinary skill in the art will understand that: the drawings are only schematic representations of one embodiment, and the blocks or processes in the drawings are not necessarily required to practice the present invention and may be replaced or updated to achieve the same or better effect.
Those of ordinary skill in the art will understand that: the components in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, or may be correspondingly changed in one or more devices different from the embodiments. The components of the above embodiments may be combined into one component, or may be further divided into a plurality of sub-components.
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. The utility model provides a local resonance elastic wave metamaterial device with active control function, its characterized in that, includes base plate, connecting rod, local oscillator and piezoelectric patches, even distribution is provided with the connecting rod on the base plate, and the upper portion and the lower part of every connecting rod are based on the mutual symmetry of base plate, and the upper and lower both ends of every connecting rod all are connected with local oscillator, and the upper portion and the lower part of every connecting rod all are equipped with the piezoelectric patches, and every piezoelectric patches all links to each other with there being external negative capacitance circuit, finally constitutes jointly and can carry out the local resonance type elastic wave metamaterial of initiative regulation and control.
2. The device of claim 1, wherein the piezoelectric sheet is a PZT-5H piezoelectric sheet, and the intrinsic elastic modulus of the piezoelectric sheet is 80GPa and can be adjusted by an external negative capacitance circuit.
3. The device as claimed in claim 1, wherein the connecting rods are rectangular, and the front and rear sides of the upper portion of each connecting rod and the front and rear sides of the lower portion of each connecting rod are respectively attached with a piezoelectric plate, and the width of the piezoelectric plate is the same as the width of the connecting rod.
4. The device according to claim 1, wherein the connecting rods are arranged on the substrate plate periodically at 8 × 8 intervals, and the device has a periodic structure, and has a frequency band gap and a pass band characteristic of elastic waves and vibrations.
5. An experimental method of a local resonance elastic wave metamaterial device with an active control function is characterized by comprising the following steps:
(1) the two vertex angles at one side of the base plate are provided with holes and connected with fishing lines, the base plate is suspended through the fishing lines, and the two fishing lines for suspending the base plate are equal in length;
(2) the bottom edge of the suspended base plate is clamped by a clamp and connected with a vibration exciter;
(3) the vibration exciter excites different frequencies, and data obtained by vibration of different frequencies are recorded and analyzed.
6. The application of the local resonance elastic wave metamaterial device with the active control function is characterized in that the local resonance elastic wave metamaterial device is used for active control vibration isolation in the frequency range of 900Hz to 1400 Hz.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754097A (en) * | 2022-04-11 | 2022-07-15 | 中国地质大学（武汉） | Vibration isolation metamaterial device based on equivalent mass amplification and vibration isolation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020021057A1 (en) * | 2000-08-10 | 2002-02-21 | Rion Co., Ltd. | Elastic wave control element using piezoelectric materials |
| US20110109102A1 (en) * | 2009-10-29 | 2011-05-12 | Mccoy John J | Meta-material vibration energy harvester |
| CN106205586A (en) * | 2016-07-11 | 2016-12-07 | 武汉理工大学 | A kind of metal-based foam fills broad band low frequency gap elasticity Meta Materials |
| CN113339438A (en) * | 2021-06-22 | 2021-09-03 | 天津大学 | Quasi-zero phononic crystal vibration isolation device capable of actively controlling multi-directional vibration isolation |
-
2021
- 2021-09-27 CN CN202111138189.7A patent/CN113883200A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020021057A1 (en) * | 2000-08-10 | 2002-02-21 | Rion Co., Ltd. | Elastic wave control element using piezoelectric materials |
| US20110109102A1 (en) * | 2009-10-29 | 2011-05-12 | Mccoy John J | Meta-material vibration energy harvester |
| CN106205586A (en) * | 2016-07-11 | 2016-12-07 | 武汉理工大学 | A kind of metal-based foam fills broad band low frequency gap elasticity Meta Materials |
| CN113339438A (en) * | 2021-06-22 | 2021-09-03 | 天津大学 | Quasi-zero phononic crystal vibration isolation device capable of actively controlling multi-directional vibration isolation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754097A (en) * | 2022-04-11 | 2022-07-15 | 中国地质大学（武汉） | Vibration isolation metamaterial device based on equivalent mass amplification and vibration isolation method |
| CN114754097B (en) * | 2022-04-11 | 2022-12-30 | 中国地质大学（武汉） | Vibration isolation metamaterial device based on equivalent mass amplification and vibration isolation method |
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