CN113446342A - Quasi-zero rigid elastic wave metamaterial vibration isolation device with active regulation and control function - Google Patents
Quasi-zero rigid elastic wave metamaterial vibration isolation device with active regulation and control function Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
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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
- F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
- F16F7/104—Vibration-dampers; Shock-absorbers using inertia effect the inertia member being resiliently mounted
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
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Abstract
The invention discloses a quasi-zero rigid-elastic wave metamaterial vibration isolation device with an active regulation function, which is characterized by comprising a vibration isolation table, a mass block connecting rod mechanism and a negative capacitance circuit, wherein the vibration isolation table is arranged on the vibration isolation table; the mass block connecting rod mechanism consists of a large mass block and a small mass block which are sequentially and alternately connected, the large mass block and the small mass block are respectively provided with four through connecting holes, hinge shafts are arranged in the connecting holes, and the same sides of the adjacent large mass block and the small mass block are hinged through two connecting rods which are arranged in a crossed manner; the connecting rods on the outermost sides for connecting the large mass block and the small mass block are provided with piezoelectric sheets, and each piezoelectric sheet is connected with a negative capacitor circuit.
Description
Technical Field
The invention relates to the technical field of artificial elastic wave metamaterial, in particular to a quasi-zero steel metamaterial device for actively regulating and controlling low-frequency bending waves.
Background
In recent years, elastic wave metamaterials are gradually becoming a popular scientific research direction, and scholars in various fields at home and abroad carry out deep research on the elastic wave metamaterials, obtain a plurality of achievements with practical application values and realize some engineering equipment in related fields. One class of elastic wave metamaterials, which have artificial periodic structures with periodically varying material constants and elastic band gap characteristics, is called phononic crystals. When the frequency of a certain elastic wave is within the band gap range of the elastic wave metamaterial, the elastic wave with the specific frequency cannot propagate in the structure, and therefore isolation of the elastic wave with the specific frequency is achieved. Because the elastic wave metamaterial has the characteristics, the elastic wave metamaterial can be applied to vibration isolation, noise reduction and the like, and has a very wide prospect in the technical field of engineering. For example, such characteristics can be applied to vibration reduction of high-precision experimental instruments and vibration isolation and noise reduction in the fields of aerospace, national defense, military industry and the like. However, due to the limitations of such materials and structures, they cannot be directly and widely applied to various practical engineering problems. This is because such systems produce different ranges of frequency forbidden bands due to different structures. In the face of the complicated and wide range of vibration frequency in the actual engineering, the vibration frequency cannot be adjusted conveniently.
Meanwhile, the problem of vibration isolation in the low frequency range is also a difficult point to overcome in the current research situation. The quasi-zero rigid-elastic wave metamaterial is a design method for realizing a low-frequency band gap in recent years. Through the periodic structure form that adopts quasi-zero rigidity for wherein the quasi-zero rigid oscillator can have the rigidity characteristic of high static low developments, arranges the oscillator periodicity, alright form novel elastic wave metamaterial. For example, a positive and negative spring parallel structure is adopted, so that lower overall system rigidity is obtained, overall natural frequency is further reduced, and isolation of elastic waves and vibration in a low-frequency range or even an ultralow-frequency range is realized.
Therefore, the focus of research in this field is to realize isolation of low-frequency elastic waves while actively controlling the forbidden band range between the photonic crystal and the elastic wave metamaterial.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a quasi-zero rigid-elastic wave metamaterial vibration isolation device with an active regulation function. The invention relates to a linear design, in the range of the original structure passband, a piezoelectric sheet of a negative capacitance circuit is introduced into an elastic wave metamaterial to electrify the circuit, so that equivalent elastic modulus at certain positions in a mass block link mechanism is changed, thus the bending wave at certain frequency in the passband of the mass block link mechanism is forbidden to be transmitted, and the local elastic modulus is changed in a mode of adding the piezoelectric sheet to realize active control. And the specific characteristics of the elastic waves in the specific frequency range before and after the piezoelectric sheet is electrified during propagation are researched by adopting finite element numerical calculation and an experimental method.
The purpose of the invention is realized by the following technical scheme:
a quasi-zero rigid-elastic wave metamaterial vibration isolation device with an active regulation function comprises a mass block link mechanism and a negative capacitance circuit; the mass block connecting rod mechanism consists of a large mass block and a small mass block which are sequentially and alternately connected, the large mass block and the small mass block are respectively provided with four through connecting holes, hinge shafts are arranged in the connecting holes, and the same sides of the adjacent large mass block and the small mass block are hinged through two connecting rods which are arranged in a crossed manner; the connecting rods on the outermost sides for connecting the large mass block and the small mass block are provided with piezoelectric sheets, and each piezoelectric sheet is connected with a negative capacitor circuit.
Further, the large mass block and the small mass block are both made of white photosensitive resin material.
Furthermore, the piezoelectric sheet is a PZT-5H rectangular piezoelectric sheet, has an inherent elastic modulus of 77.5GPa, and can be adjusted through an external circuit.
Furthermore, the forbidden band range of the vibration isolation device is 350Hz-800Hz and 1460Hz-2530Hz under the condition of no electrification; when the equivalent elastic modulus of the piezoelectric sheet is controlled to be 110GPa by adjusting the negative capacitance circuit, the forbidden band ranges from 300Hz to 1000Hz and 1150Hz to 2400 Hz.
The invention also provides a quasi-zero rigid-elastic wave metamaterial vibration isolation experimental device with an active regulation function, based on the quasi-zero rigid-elastic wave metamaterial vibration isolation device, the equivalent elastic modulus of part of piezoelectric sheets is increased by regulating the negative capacitance circuit, when the mass block connecting rod mechanism vibrates, because the equivalent elastic modulus of part of the elastic wave metamaterial vibration isolation device is higher than that of other parts, bending waves under a determined frequency cannot be transmitted, and the active control on the low-frequency vibration and the transmission direction of the bending waves is realized.
In addition, the invention also provides a quasi-zero rigid-elastic wave metamaterial vibration isolation experiment method with an active regulation function, wherein a negative capacitance circuit is regulated to increase the equivalent elastic modulus of part of piezoelectric sheets, when the mass block linkage mechanism vibrates, because the equivalent elastic modulus of part of the elastic wave metamaterial vibration isolation device is higher than that of other parts, bending waves at a determined frequency cannot be transmitted, and the active control of low-frequency vibration and the transmission direction of the bending waves is realized.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the device can design a novel quasi-zero rotational stiffness structure, has a wider forbidden band range of low frequency, achieves the aim of low-frequency vibration reduction and isolation, can be used for the condition that elastic waves and vibration with lower specific frequency need to be inhibited, and can achieve the aim of low-frequency vibration reduction and isolation in practical engineering application.
2. Piezoelectric sheets are periodically pasted on two sides of the mass block connecting rod mechanism to form a periodic structure with active control performance, wherein the obvious difference between the negative capacitance circuit and other circuits is the access of an operational amplifier, the positive electrode of the negative capacitance circuit is connected with the negative input end of the amplifier, the positive input end is grounded, and circuit parameters can be changed by adjusting the size of a resistor in the circuit, so that equivalent parameters of the piezoelectric sheets are changed, and the purpose of active control is further achieved. The vibration isolation device provided by the invention adjusts the equivalent elastic modulus of the piezoelectric sheet in the elastic wave metamaterial through the negative capacitance circuit to control the propagation process of the bending wave.
3. Compared with the traditional vibration damper, the traditional metamaterial vibration damper has a fixed structure, so that the forbidden band range, namely the frequency range capable of playing the role of attenuation, is fixed. The device is designed and connected with the adjustable and controllable circuit by introducing the piezoelectric sheet, so that a user of the device can flexibly adjust the forbidden band range according to the forbidden band range required in practice by changing the resistance value in the circuit, and the applicable range of the device is wider.
4. The main body part of the vibration isolation device is manufactured by 3D printing and connected by common bolts and screws, and compared with the existing device, the vibration isolation device has the advantages of being small in mass, light, simple to manufacture and use, capable of being manufactured by a common commercial 3D printer, free of special customization and short in production time.
5. The vibration isolation device can be applied to most relevant fields needing vibration isolation and noise reduction, for example, some precise instruments have extremely high requirements on environmental vibration, slight vibration can influence the operation and use effects of the precise instruments, the device can change the forbidden band range through the adjusting circuit according to different vibration environments, the vibration waves in the forbidden band range can be greatly attenuated, and the vibration isolation and noise reduction effects are achieved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a structure diagram of a linear quasi-zero rigid-elastic wave metamaterial unit cell (including two side piezoelectric sheets) according to an embodiment of the present invention.
Fig. 2 is a mass link mechanism according to an embodiment of the present invention.
Fig. 3a to 3f are mode diagrams of finite element simulations at excitation frequencies of 1Hz, 301Hz, 1021Hz, 1461Hz, 2531Hz and 3011Hz respectively in a piezoelectric sheet non-energized state (elastic modulus 77.5GPa) according to an embodiment of the present invention.
Fig. 4a to 4g are mode diagrams of finite element simulations at excitation frequencies of 1Hz, 831Hz, 1031Hz, 1431Hz, 1911Hz, 2571Hz and 2971Hz respectively under the condition that the piezoelectric sheets provided by the embodiment of the invention are electrified (the elastic modulus is 110 GPa).
Fig. 5a and 5b are frequency response graphs in finite element simulation calculation when the elastic modulus of the piezoelectric sheet before energization is 77.5GPa and the elastic modulus of the piezoelectric sheet after energization becomes 110GPa, respectively.
Fig. 6 is a schematic diagram of a negative capacitor circuit according to an embodiment of the invention.
Fig. 7a and 7b are amplitude chart comparisons of 300Hz frequency elastic waves propagated therein before and after energization, respectively, in a specific experiment of the present invention.
Fig. 8a and 8b are amplitude diagrams of an elastic wave with a frequency of 1340Hz propagated therein before and after power-on in a specific experiment of the present invention, respectively.
Detailed Description
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 elements or elements having the same or similar function throughout. 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.
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, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" 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.
For the convenience of understanding the embodiments of the present invention, the following description will be further explained by taking several specific embodiments as examples in conjunction with the drawings, and the embodiments are not to be construed as limiting the embodiments of the present invention.
The propagation characteristics of the elastic wave bands of the periodic structure can be artificially regulated and controlled through the change of the artificial periodic structure on geometric and material parameters. The embodiment of the invention provides a linear quasi-zero stiffness active bending wave regulation metamaterial vibration isolation device, and the regulation and control of the equivalent elastic modulus of a piezoelectric plate can be realized through a negative capacitance circuit, so that the internal parameters of an elastic wave metamaterial can be changed through active control, and the active regulation and control of the elastic wave propagation characteristic in the quasi-zero stiffness metamaterial can be realized. The invention provides an active regulation and control mode, which can change the elastic modulus of a piezoelectric plate in an elastic wave metamaterial so as to achieve the purpose of controlling the propagation direction of bending waves in a low-frequency region.
The quasi-zero rigid-elastic wave metamaterial vibration isolation device with the active regulation function comprises a vibration isolation table, a mass block connecting rod mechanism and a negative capacitance circuit, wherein the vibration isolation table is arranged on the vibration isolation table; the mass block connecting rod mechanism consists of large mass blocks 1 and small mass blocks 2 which are sequentially and alternately connected, four through connecting holes 3 are formed in each of the large mass blocks 1 and the small mass blocks 2, hinge shafts are installed in the connecting holes 3, and the same sides of one large mass block 1 and one small mass block 2 which are adjacent are hinged through two connecting rods 4 which are arranged in a crossed mode; piezoelectric sheets 5 are arranged on the connecting rods 4 on the outermost sides connecting the large mass block and the small mass block, and each piezoelectric sheet 5 is connected with a negative capacitor circuit; one end of the mass block connecting rod mechanism is suspended on the vibration isolation platform through a connecting wire, and the other end of the mass block connecting rod mechanism is connected with the vibration exciter.
The equivalent elastic modulus of the piezoelectric sheet is increased through the adjustment of the negative capacitance circuit. When the mass block link mechanism vibrates, because the equivalent elastic modulus (piezoelectric plate) of a part of the elastic wave metamaterial vibration isolation device is higher than that of other parts, the bending wave under specific frequency can be forbidden to be transmitted, and the active control on the transmission directions of the low-frequency vibration and the bending wave can be realized by combining the low-frequency forbidden band characteristic of the quasi-zero stiffness periodicity of the mass block link mechanism. Although the connecting wire is included in the device, the connecting wire is only used as a device for connecting the mass block connecting rod mechanism and the vibration isolation platform.
As shown in fig. 1, the embodiment of the present invention regards the structure shown in fig. 1 as a unit cell structure constituting a mass link mechanism. FIG. 2 is a representation of a finite element spatial configuration of a mass linkage, with the cell structure of FIG. 1 expanded horizontally, to 7 cell structures only, in a finite element simulation. Each mass block is made of resin materials, a mass block connecting rod mechanism is hung on the vibration isolation platform through a connecting wire and is directly connected with the vibration exciter, piezoelectric plates are periodically pasted on two sides of the mass block connecting rod mechanism, and in addition, each piezoelectric plate is independently connected with a negative capacitance circuit to adjust the equivalent elastic modulus of the piezoelectric plate so as to realize active regulation and control. And the periodic structures with the active control performance of the low-frequency forbidden band are formed together.
As shown in fig. 3a to 3f, the piezoelectric sheet in the mass link mechanism is under a condition of no power supply or no power supply circuit, and the elastic modulus is 77.5GPa calculated according to the formula. Applying a force of 1m/s to one side (y direction) of the mass block link mechanism2And (3) acceleration excitation, calculating the response with the frequency of 0-3000Hz by using finite element software COMSOL, and drawing a response mode graph according to the result. The forbidden band range in the mass block connecting rod mechanism can be roughly judged according to the mode diagram, and when the frequency range is 0-110Hz, elastic waves propagating in the mass block connecting rod mechanism are gradually attenuated and forbidden to pass through, so that low-frequency vibration isolation is realized.
As shown in fig. 4a to 4g, the piezoelectric sheet is connected to a negative capacitor circuit, and the circuit parameters are adjusted so that α is (R)2×C0)/(R1×Cp) A value of 0.66, the elastic modulus of the piezoelectric plate is about 110GPa, and a value of 1m/s is applied to the mass link mechanism side (y direction)2And (3) acceleration excitation, calculating the response with the frequency of 1-3000Hz by using finite element software COMSOL, and drawing a response mode graph according to the result.
Fig. 5a shows a state in which the piezoelectric sheet is set in the finite element software in a non-energized state, and the equivalent elastic modulus of the piezoelectric sheet is 77.5 GPa. FIG. 5b shows the state of the finite element software when the piezoelectric sheet is powered on, and the equivalent elastic modulus of the piezoelectric sheet is 110GPa
Fig. 6 is a schematic diagram of a negative capacitance circuit, which is a circuit form commonly used in the field of active control at present, and has a good regulation function. The difference between the circuit structure and other circuits is the access 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 the circuit parameters can be changed by adjusting the resistance value, so that the circuit structure is applicable to the field of power supply, power supply and the likeThe equivalent parameters of the piezoelectric sheet are changed, and the purpose of active control is further achieved. Wherein the complex impedance Z is 1/(. alpha.xC)pXs), wherein α ═ R (R)2×C0)/(R1×Cp)，C0Is externally connected with a capacitor, CpIs the equivalent capacitance of the piezoelectric patch.
Fig. 7a and 7b are graphs of the amplitude of the data measured experimentally at a frequency of 330 Hz. As shown in fig. 7a, the magnitude of the amplitude measured when the circuit is not energized, with a frequency excitation of 300 Hz. FIG. 7b shows the magnitude of the amplitude measured when the circuit is powered on without 300Hz frequency excitation. Comparing fig. 7a and fig. 7b, it can be seen that after the circuit is powered on, the propagation of the amplitude at 300Hz frequency is significantly attenuated, which is approximately calculated to be 42% of the original amplitude.
FIGS. 8a and 8b are graphs of the amplitude of 1340Hz data obtained from the experimental test. As shown in fig. 8a, the amplitude measured when the 1340Hz frequency was excited and the circuit was not powered. FIG. 8b shows the magnitude of the measured amplitude when the circuit is powered on without 1340Hz frequency excitation. Comparing fig. 8a and 8b, it can be seen that after the circuit is powered on, the propagation of the amplitude at the frequency of 1340Hz is significantly attenuated, which is approximately calculated to be 31% of the original amplitude.
The working principle of the metamaterial device for actively regulating and controlling bending waves of the embodiment of the invention comprises the following steps:
based on the theory of the periodic structure band gap characteristics, the piezoelectric sheets are distributed in a periodic manner, so that the elastic waves with specific frequencies have frequency band gaps for inhibiting the propagation of the elastic waves. When an elastic wave propagates in a periodic structure, the propagation of the elastic wave at certain specific frequencies is suppressed due to the effect of the band gap. When the structure is electrified to change the overall elastic modulus of the connecting rod piezoelectric sheet, the elastic waves at certain characteristic frequencies are prohibited from being transmitted.
The device utilizes an active control system consisting of a piezoelectric sheet and a negative capacitor circuit, changes the internal equivalent parameters of the elastic wave metamaterial by adjusting the circuit parameters to change the structural parameters so as to change the forbidden band range, and enables the bending wave with specific frequency to be transmitted along the wave vector direction. As shown in FIG. 5, the negative capacitance circuit diagram actively controls the equivalent elastic modulus of the piezoelectric sheet in the structure mainly by adjusting the ratio of the resistors R1 and R2. The equivalent elastic modulus of the piezoelectric sheet under simple harmonic vibration is
Wherein: h ispIs the thickness of the piezoelectric sheet, Z is the complex impedance of the circuit, CpIs the equivalent capacitance of the piezoelectric sheet, AsThe area of the piezoelectric sheet, ω is the frequency,
is the elastic compliance coefficient, d31I is the piezoelectric coefficient and i is the imaginary unit.
Complex impedance Z1/(- α × C) in 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. When the value of alpha is 0.66, the equivalent elastic modulus of the piezoelectric sheet can be approximately 110GPa, for example, when the frequency is 1251Hz, the mode diagram shows that the vibration displacement at the connecting rod is obviously smaller than the corresponding frequency when the connecting rod is not electrified, which means that after the power is electrified, the elastic modulus of the piezoelectric sheet is changed, and the propagation of the bending wave with a specific frequency is forbidden compared with the propagation of the bending wave without the power, so that the propagation direction of the bending wave can be actively controlled.
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 capacitor circuit to adjust the equivalent parameters in the elastic wave metamaterial, so as to control the propagation direction of the elastic wave in the structure. The device can be used for the condition that the specific frequency elastic wave propagation direction needs to be changed, and the low-frequency vibration isolation characteristic with the mass block link mechanism is adopted, so that the aim of low-frequency vibration attenuation and vibration isolation can be achieved through active regulation.
The device only simulates and tests the propagation of the bending wave under a certain specific structure, but the device can realize the control of the propagation direction of the bending wave under different frequencies by adjusting circuit parameters, and has the advantage of easy adjustment due to the action of the negative capacitance circuit.
The whole device consists of a resin mass block link mechanism, PZT-5H piezoelectric ceramics, various circuit elements and a simple connecting device. The device has simple structural design, is easy to purchase and assemble, and is very easy to operate after the design is finished.
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 are referred to each other, and each embodiment focuses on the differences from the other embodiments. 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. 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 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. A quasi-zero rigid-elastic wave metamaterial vibration isolation device with an active regulation function is characterized by comprising a mass block link mechanism and a negative capacitance circuit; the mass block connecting rod mechanism consists of a large mass block and a small mass block which are sequentially and alternately connected, the large mass block and the small mass block are respectively provided with four through connecting holes, hinge shafts are arranged in the connecting holes, and the same sides of the adjacent large mass block and the small mass block are hinged through two connecting rods which are arranged in a crossed manner; the connecting rods on the outermost sides for connecting the large mass block and the small mass block are provided with piezoelectric sheets, and each piezoelectric sheet is connected with a negative capacitor circuit.
2. The quasi-zero rigid-elastic wave metamaterial vibration isolation device with active tuning and control functions of claim 1, wherein the large mass and the small mass are both composed of white photosensitive resin material.
3. The quasi-zero rigid-elastic wave metamaterial vibration isolation device with the active regulation function as claimed in claim 1, wherein the piezoelectric sheets are PZT-5H rectangular piezoelectric sheets, have an inherent elastic modulus of 77.5GPa, and can be adjusted through an external circuit.
4. The quasi-zero rigid-elastic wave metamaterial vibration isolation device with the active regulation function as claimed in claim 1, wherein the forbidden band range of the vibration isolation device is 350Hz-800Hz, 1460Hz-2530Hz under the condition of no electrification; when the equivalent elastic modulus of the piezoelectric sheet is controlled to be 110GPa by adjusting the negative capacitance circuit, the forbidden band ranges from 300Hz to 1000Hz and 1150Hz to 2400 Hz.
5. A quasi-zero rigid elastic wave metamaterial vibration isolation experiment device with an active regulation function is based on the quasi-zero rigid elastic wave metamaterial vibration isolation device and is characterized in that connecting wires are arranged at two ends of a mass block link mechanism, one end of the mass block link mechanism is suspended on a vibration isolation table through the connecting wires, and the other end of the mass block link mechanism is connected with a vibration exciter; the distance between the connecting line and the two ends of the mass block connecting rod mechanism is equal, and the length of the connecting line is equal, so that the mass block connecting rod mechanism is kept horizontal on the vibration isolation table.
6. A quasi-zero rigid elastic wave metamaterial vibration isolation experiment method with an active regulation function is characterized in that a negative capacitance circuit is adjusted to increase equivalent elastic modulus of a part of piezoelectric sheets, when a mass block linkage mechanism vibrates, bending waves cannot be transmitted under determined frequency due to the fact that the equivalent elastic modulus of the part of an elastic wave metamaterial vibration isolation device is higher than that of other parts, and active control over low-frequency vibration and the transmission direction of the bending waves is achieved.
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| CN202110586726.8A CN113446342A (en) | 2021-05-27 | 2021-05-27 | Quasi-zero rigid elastic wave metamaterial vibration isolation device with active regulation and control function |
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