Piezoelectric photonic crystal beam based on DNA structure

Abstract

The utility model discloses a piezoelectric photonic crystal beam based on a DNA (deoxyribonucleic acid) structure, which comprises piezoelectric photonic crystal unit cells horizontally and periodically arranged in a one-dimensional direction. Each piezoelectric photonic crystal unit cell comprises a base body layer formed by connecting two semi-elliptical base bodies in a back-to-back manner, coating pairs which are periodically arrayed along the one-dimensional direction of the base body layer and are oppositely arranged on the inner sides of the arc edges of the semi-elliptical base bodies, and local oscillators which are arranged between the coating pairs, and a coating layer is formed by the plurality of coating pairs; and the plurality of local oscillators form a scatterer layer. According to the piezoelectric photonic crystal beam, on the basis of realizing light weight, the piezoelectric photonic crystal beam has a band gap with a relatively wide frequency domain.

Description

Technical Field

[0001] The utility model relates to the technical field of phonon crystal vibration control, in particular to a piezoelectric phonon crystal beam based on DNA structure. Background Technique

[0002] Vibration and noise will not only cause noise pollution to the surrounding environment, but also have inevitable negative impacts on the durability, safety and functionality of equipment. For example, in the field of ships, the vibration and noise caused by the high rotation speed of the propeller greatly reduce the stealth performance of underwater vehicles. Therefore, it is necessary to control vibration and noise to achieve vibration reduction and noise reduction. Currently, the mainstream vibration control methods include weakening from the vibration source and using physical sound absorption characteristics to reduce vibration, etc.

[0003] Phononic crystals are also a conventional means in the field of vibration propagation path control. Phononic crystals are materials composed of two or more elastic media. Due to their special band gap characteristics, elastic waves are suppressed within a certain frequency range when propagating in phononic crystals. The model structure of phononic crystals plays a crucial role in obtaining the target band gap. In the prior art, Chinese Patent CN115370703A discloses an anti-collision and energy absorption device based on a bionic structure. The device can achieve vibration reduction effects on the structure by adding an anti-collision and energy absorption effective structure of a bionic bamboo wall vascular bundle honeycomb structure and a multi-layer concentric ring structure of trees, and combining the local resonance theory of phononic crystal units. However, this structure is relatively complex, unable to achieve lightweight of the structure, and only targets vibration control within a specific frequency band, unable to achieve adjustable band gaps. Chinese Patent CN117823556A proposes a three-dimensional star-shaped negative Poisson's ratio energy absorption lattice metamaterial. This structure has good absorption and anti-impact properties for energy propagation, but has insufficient ability to adjust the band gap and is also relatively complex in structure, increasing the manufacturing difficulty.

[0004] Therefore, it is urgent to solve the above problems. Summary of the Invention

[0005] Purpose of the Utility Model: The purpose of the utility model is to provide a piezoelectric phonon crystal beam based on DNA structure. On the basis of achieving lightweight, the piezoelectric phonon crystal beam has a wide-frequency band gap.

[0006] Technical Solution: To achieve the above purpose, the utility model discloses a piezoelectric phonon crystal beam based on DNA structure, including piezoelectric phonon crystal unit cells horizontally and periodically arranged in one-dimensional direction. The piezoelectric phonon crystal unit cell includes a matrix layer formed by connecting two semi-elliptical matrices back to back, a pair of coatings arranged periodically along the one-dimensional direction of the matrix layer and relatively arranged inside the arc sides of the semi-elliptical matrices, and local oscillators located between each pair of coatings. Multiple pairs of coatings form a coating layer, and multiple local oscillators form a scatterer layer.

[0007] Among them, the lattice constant of the piezoelectric phononic crystal unit cell is 0.01 m to 1 m, and the thickness of the unit cell is 1.5e -6 m to 1e -3 m.

[0008] Preferably, the width of the local oscillator is 0.005 m to 0.02 m, and the length of the local oscillator is 0.0025 m to 0.02 m.

[0009] Furthermore, the thicknesses of the matrix layer, the coating pair, and the local oscillator are the same.

[0010] Further, the volume of the coating pair decreases successively from the outside of the unit cell to the central symmetry line.

[0011] Preferably, the volumes of the multiple local oscillators are the same or different.

[0012] Furthermore, the matrix layer, the coating pair, and the local oscillator are all rigidly connected.

[0013] Further, the matrix layer is a structure made of an elastic material.

[0014] Preferably, the coating layer is a structure made of a thermoplastic material.

[0015] Furthermore, the scatterer layer is a structure made of a piezoelectric material.

[0016] Beneficial effects: Compared with the prior art, the present utility model has the following advantages: On the basis of extracting the basic structure of DNA, the present utility model utilizes the structures of the matrix layer, the coating layer, and the scatterer layer, so that the phononic crystal beam has good low-frequency bandgap characteristics, a wide vibration damping frequency range, and excellent bandgap adjustability, and can control the bandgap frequency band of the phononic crystal beam within the range of 0 Hz to 5000 Hz, and can be flexibly changed with the change of the unit cell structure size, effectively solving the vibration control problems in different situations in practical engineering; Compared with the traditional beam structure, the present utility model has a simple structure and a large number of hollowing treatments, significantly reducing the mass and reducing the use of materials while maintaining the same volume and thickness, and at the same time ensuring the stability of the structure, not only achieving the goals of lightweight and economy, but also showing more excellent performance in the vibration damping effect; The phononic crystal unit cell of the present utility model includes multiple local oscillators composed of piezoelectric materials, allowing different voltages to be applied to each local oscillator, and quickly optimizing the voltage combination according to the actual engineering requirements, so as to achieve precise vibration control and significantly improve the vibration damping effect on this basis; The present utility model can control the bandgap by changing material component coefficients, lattice constants, the width and length of the coating pair, the width and length of the local oscillator, and the one-dimensional arranged unit cell period number, etc. Description of the Drawings

[0017] Figure 1 It is a schematic diagram of a single cell of the present utility model;

[0018] Figure 2 It is a schematic diagram of the structure of a finite periodic sequence piezoelectric phononic crystal beam of the present utility model;

[0019] Figure 3 It is a schematic diagram of the structural dimensions of a single cell of the present utility model;

[0020] Figure 4 It is a schematic diagram of the thickness dimension of the single cell structure of the present utility model;

[0021] Figure 5 It is a band structure diagram in the case of Embodiment 1 of the present utility model;

[0022] Figure 6 It is a transmission curve diagram in the case of Embodiment 1 of the present utility model;

[0023] Figure 7 It is a band structure diagram in the case of Embodiment 2 of the present utility model;

[0024] Figure 8 It is a transmission curve diagram in the case of Embodiment 2 of the present utility model;

[0025] Figure 9 It is a band structure diagram in the case of Embodiment 3 of the present utility model;

[0026] Figure 10 It is a transmission curve diagram in the case of Embodiment 3 of the present utility model;

[0027] Figure 11 It is a band structure diagram in the case of Embodiment 4 of the present utility model;

[0028] Figure 12 It is a transmission curve diagram in the case of Embodiment 4 of the present utility model;

[0029] Figure 13 It is a model vibration mode diagram taking 3000 Hz as an example in Embodiment 4 of the present utility model;

[0030] In the figure: matrix layer 1, coating pair 2, local oscillator 3, lattice constant, length of the major semi-axis of the inner ellipse, width of the unit cell model, length of the minor semi-axis of the inner ellipse, radius of the rounded corner, distance between adjacent coating pairs, width of the matrix layer edge, length of the four-corner rectangle of the matrix layer, width of the left local oscillator, width of the middle local oscillator, width of the right local oscillator, length of the left local oscillator, length of the middle local oscillator, length of the right local oscillator, thickness of the unit cell. Detailed implementation manners

[0031] The technical solution of the present utility model will be further described below with reference to the accompanying drawings.

[0032] As shown Figure 1 in the figure, a piezoelectric phonon crystal beam based on a DNA structure of the present utility model includes a piezoelectric phonon crystal unit cell, the piezoelectric phonon crystal unit cells are horizontally arranged periodically in one dimension, the piezoelectric phonon crystal unit cell includes a matrix layer 1, a coating pair 2 and a local oscillator 3. The matrix layer 1 is formed by connecting two semi-elliptical matrices back to back. The coating pairs 2 are arranged periodically in the one-dimensional direction of the matrix layer 1. The coating pairs 2 are located inside the arc sides of the semi-elliptical matrix. Two coating pairs 2 are arranged oppositely. The local oscillator 3 is located between each pair of coating pairs. A plurality of coating pairs form a coating layer, and a plurality of local oscillators form a scatterer layer. The coating pairs are symmetrically distributed from left to right. The matrix layer 1, the coating layer 1 and the scatterer layer 1 form a one-dimensional periodic unit and are arranged and distributed along the horizontal direction. The matrix layer 1 is subjected to a fillet smoothing treatment at the place with a larger curvature. The local oscillator 3 and the coating pairs 2 are arranged at equal intervals in the horizontal direction. When the matrix layer 1, the coating layer, the scatterer layer and the unit cell are arranged in one dimension along the horizontal direction to form a phonon crystal beam, they are all rigidly connected. The DNA structure means a structural form in which the matrix layers are alternately connected, and the coating layer is arranged inside to wrap the scatterer layer to form a basic framework. Among them, the matrix layer is made of an elastic material such as epoxy resin, etc.; the coating layer is made of a thermoplastic material such as plexiglass, etc.; the scatterer layer is made of a piezoelectric material such as a piezoelectric smart material, etc.

[0033] The lattice constant of the piezoelectric phonon crystal unit cell is 0.01 m to 1 m, and the cell thickness is 1.5e -6 m to 1e -3 m. The width of the local oscillator is 0.005 m to 0.02 m, and the length of the local oscillator is 0.0025 m to 0.02 m. The matrix layer, the coating pair and the local oscillator have the same thickness. The volume of the coating pair decreases sequentially from the outside of the unit cell to the central symmetry line. The volumes of a plurality of local oscillators are the same or different. The matrix layer, the coating pair and the local oscillator are all rigidly connected. The matrix layer is an elastic material, the coating layer is a thermoplastic material, and the scatterer layer is a piezoelectric material.

[0034] As shown Figure 2As shown, the size of the unit cell can be adjusted according to actual engineering requirements to achieve bandgap ranges at different frequencies. By horizontally arranging the unit cells in one-dimensional direction, a piezoelectric phononic crystal beam based on DNA structure can be constructed. The number of periods of the local oscillator in one-dimensional direction has an important influence on the properties of the bandgap. An increase in the number of periods usually brings a wider bandgap, thus improving the vibration damping performance. However, in practical applications, limited by the structural size and lightweight requirements, a balance needs to be found between the number of periods and the vibration damping effect to reduce material usage and structural complexity while still achieving the expected vibration damping effect. Therefore, the number of local oscillators of the present utility model is preferably selected within the range of 6 to 20 periods, and this range can be adjusted according to the actual situation of specific projects. By adjusting the number of periods of the local oscillator and its one-dimensional periodicity, combined with the optimization of size parameters, the broadening of the bandgap or the generation of multiple bandgaps can be achieved, improving the vibration damping performance of the piezoelectric phononic crystal beam, thereby solving the vibration damping problem at specific frequencies in the engineering field.

[0035] Example 1: With the increase in ship size and sailing speed, the vibration problems caused by factors such as the main engine, propulsion system, and wave impact become more and more serious. These vibrations may not only cause fatigue damage to the hull structure but also affect the navigation stability and safety. According to the "Vibration Test Requirements for Ship Equipment and Machinery Components" (GB / T 19845-2005), the vibration frequencies on ships usually concentrate below 100 Hz and are mainly generated by components such as engines, propulsion devices, and propellers. For the low-frequency vibrations in this frequency band, traditional vibration damping means often have limited effects. The present utility model proposes a piezoelectric phononic crystal beam based on DNA structure. By applying this piezoelectric phononic crystal beam to the equipment generating vibrations, the suppression effect on low-frequency vibrations can be significantly improved. Example 1 demonstrates the effectiveness of this piezoelectric phononic crystal beam and provides a practical solution for solving the ship low-frequency vibration problem.

[0036] In Example 1, the piezoelectric phononic crystal beam includes a matrix layer, a coating layer, and a scatterer layer. Among them, the matrix layer uses epoxy resin, the coating layer uses plexiglass, and the local oscillator uses piezoelectric material PZT-4, which is horizontally arranged by one-dimensional periodic units of 1×10. As Figure 3 and Figure 4As shown in the figure, the size parameters of the piezoelectric phononic crystal beam are as follows: the lattice constant is 0.105 m, the length of the major semi-axis of the inner ellipse is 0.05 m, the width of the unit cell model is 0.105 m, the length of the minor semi-axis of the inner ellipse is 0.032 m, the radius of the fillet is 0.01 m, the distance between adjacent coatings is 0.015 m, the width of the matrix layer edge is 0.004 m, the length of the rectangle at the four corners of the matrix layer is 0.005 m, the width of the left local oscillator is 0.01 m, the width of the middle local oscillator is 0.01 m, the width of the right local oscillator is 0.01 m, the length of the left local oscillator is 0.005 m, the length of the middle local oscillator is 0.005 m, the length of the right local oscillator is 0.005 m, and the thickness of the unit cell is 0.0002 m. The material parameters of the piezoelectric phononic crystal beam are as follows: the material parameters of epoxy resin are density = 1180 kg / m 3 , Poisson's ratio is 0.368, and Young's modulus is 4.08e 10 Pa; the material parameters of PZT-4 are density = 7500 kg / m 3 , elastic constant c 11 = 132 GPa, piezoelectric constant e 31 = -4.1 C / m -2 , dielectric constant is 7.124e -9 C / V -1 m -1 ; the density of copper = 8950 kg / m 3 , Young's modulus is 16.46e 10 Pa, and Poisson's ratio is 0.35.

[0037] Through the calculation of the finite element software, the band structure of the piezoelectric phononic crystal beam is obtained, as shown in Figure 5 . The results show that in the frequency range below 100 Hz, two obvious band gaps are formed in this structure. This means that in this corresponding frequency band, phonons cannot propagate, effectively isolating the vibration energy. In addition, through the calculation of the vibration transmission curve, as shown in Figure 6 , it can be observed that, consistent with the results of the band structure diagram, two obvious attenuation frequency bands appear in this frequency range, and the maximum attenuation amplitude reaches about 240 dB. These results indicate that the piezoelectric phononic crystal beam in this embodiment exhibits excellent vibration damping effects in the frequency range below 100 Hz. Based on these performance indicators, the piezoelectric phononic crystal beam can be effectively used for vibration damping and noise reduction of ship equipment, solving the low-frequency vibration problems faced by ships during actual operation, and having good application prospects.

[0038] Embodiment 2: The vibration damping beam is an engineering component used to reduce and control structural vibrations and is widely applied in the fields of construction, mechanical equipment, transportation vehicles, and aerospace. In modern engineering, the problem of vibration has received increasing attention, especially in situations such as high-speed rotating mechanical equipment, buildings affected by wind loads, and aircraft. Vibration not only affects the stability of the structure and the lifespan of equipment but may also cause discomfort to personnel and potential safety hazards. The sources of vibration are complex and diverse, including dynamic imbalance during machine operation, resonance caused by external wind forces or earthquakes, and uneven driving of transportation vehicles. By installing vibration damping beams at key positions, the comfort and safety of the structure can be significantly improved, the service life of equipment can be extended, and the operating performance of the overall system can be enhanced. In engineering practice, the design of the vibration damping beam needs to comprehensively consider the characteristics of the vibration source and the requirements of the target application to achieve the best vibration damping effect.

[0039] In Embodiment 2, the piezoelectric phononic crystal beam is used as the vibration damping beam. The vibration damping beam is formed by horizontally arranging unit cells in a one-dimensional period of 1×15, as shown in Figure 3 and Figure 4 . The specific dimensional parameters of the piezoelectric phononic crystal beam are as follows: the lattice constant is 0.105 m, the length of the major semi-axis of the inner ellipse is 0.05 m, the width of the unit cell model is 0.105 m, the length of the minor semi-axis of the inner ellipse is 0.032 m, the fillet radius is 0.01 m, the distance between adjacent coating pairs is 0.015 m, the width of the edge of the matrix layer is 0.004 m, the length of the rectangle at the four corners of the matrix layer is 0.005 m, the width of the left local oscillator is 0.015 m, the width of the middle local oscillator is 0.0175 m, the width of the right local oscillator is 0.015 m, the length of the left local oscillator is 0.01 m, the length of the middle local oscillator is 0.0075 m, the length of the right local oscillator is 0.0075 m, and the thickness of the unit cell is 0.00125 m. The material parameters of the piezoelectric phononic crystal beam are as follows: the material parameters of epoxy resin are density = 1180 kg / m 3 , Poisson's ratio is 0.368, and Young's modulus is 4.08e 10 Pa; the material parameters of PZT-4 are density = 7500 kg / m 3 , elastic constant c 11 = 132 GPa, piezoelectric constant e 31 = -4.1 C / m -2 , dielectric constant is 7.124e -9 C / V -1 / m -1 ; the density of copper = 8950 kg / m 3 , Young's modulus is 16.46e 10 Pa, and Poisson's ratio is 0.35.

[0040] Through the calculation of finite element software, the band structure of the piezoelectric phononic crystal beam is obtained, as Figure 7 shown. The results show that the vibration damping beam structure opens five band gaps within 0 - 3200 Hz, which are 452.86 Hz - 593.17 Hz, 623.57 Hz - 682.97 Hz, 688.9 Hz - 891.50 Hz, 891.97 Hz - 1241.8 Hz, and 1299.4 Hz - 2439.7 Hz respectively. At the same time, the transmission curve of the model is calculated, as Figure 8 shown. The attenuation frequency range that appears in the transmission loss basically coincides with the band gap frequency range in the band structure diagram, which also conforms to the conclusion that the band gap frequency band of the infinite structure and the attenuation frequency band of the finite structure obtained in previous studies coincide. In multiple frequency bands, the beam shows significant vibration damping effect, and the maximum transmission ratio reaches -426.86 dB. This multi-band vibration damping ability enables the beam to adapt to vibration sources of different frequencies, providing greater flexibility for various practical application scenarios. Within the band gap frequency range, the piezoelectric phononic crystal beam almost completely blocks the propagation of vibration. This high-performance vibration damping effect is crucial for systems that require strict vibration control, such as precision machinery, optical equipment, etc.

[0041] Example 3: Bridge vibration may cause serious hazards. Long-term vibration will lead to fatigue of the bridge structure, reducing the bearing capacity and overall safety. Cracks and deformations caused by vibration may accelerate the deterioration of materials. In particular, cracks in concrete may cause water penetration, which may in turn lead to steel corrosion or further structural damage. The bridge deck may also develop cracks, settlements or potholes due to vibration, affecting driving comfort and safety. The vibration frequency of the bridge is determined by factors such as the span and structural form, generally around 3 - 4 Hz or a few Hz. Modern bridges, due to their large volume and weight, have slightly lower frequencies. By applying the present utility model to the bridge structure, the propagation of bridge vibration can be blocked to a certain extent.

[0042] The piezoelectric phononic crystal beam of Example 3 is formed by arranging unit cells horizontally in a one-dimensional period of 1×8, as Figure 3 and Figure 4As shown in the figure, the specific size parameters of the piezoelectric phononic crystal beam are as follows: the lattice constant is 0.105 m, the length of the major semi-axis of the inner ellipse is 0.05 m, the width of the unit cell model is 0.105 m, the length of the minor semi-axis of the inner ellipse is 0.032 m, the radius of the fillet is 0.01 m, the distance between adjacent coatings is 0.015 m, the width of the matrix layer edge is 0.004 m, the length of the rectangle at the four corners of the matrix layer is 0.005 m, the width of the left local oscillator is 0.015 m, the width of the middle local oscillator is 0.0175 m, the width of the right local oscillator is 0.015 m, the length of the left local oscillator is 0.01 m, the length of the middle local oscillator is 0.0075 m, the length of the right local oscillator is 0.0075 m, and the thickness of the unit cell is 0.000002 m. The material parameters are as follows: the material parameters of epoxy resin are density = 1180 kg / m 3 , Poisson's ratio is 0.368, and Young's modulus is 4.08e 10 Pa; the material parameters of PZT-4 are density = 7500 kg / m 3 , elastic constant c 11 = 132 GPa, piezoelectric constant e 31 = -4.1 Cm -2 , dielectric constant is 7.124e -9 CV -1 m -1 ; the density of copper = 8950 kg / m 3 , Young's modulus is 16.46e 10 Pa, and Poisson's ratio is 0.35.

[0043] It can be calculated that the energy band structure diagram of the unit cell is as shown in Figure 9 . It can be observed that a band gap of 3.3163 Hz - 4.2455 Hz is opened in the unit cell. At the same time, compared with the transmission curve diagram, as shown in Figure 10 , there is an obvious attenuation region at 3 - 4 Hz, and the maximum transmission ratio reaches 19.5 dB. This means that within this frequency range, the model can, to a certain extent, prevent the propagation of vibrations, thereby reducing the impact of bridge vibrations on structural safety.

[0044] Example 4: In modern engineering, the management of high-frequency vibrations has become increasingly important. Taking high-frequency vibrations in transportation as an example, high-speed trains and subways generate high-frequency sound waves with frequencies in the range of 2000 Hz to 5000 Hz when entering stations. According to the on-site actual measurements of railway environmental vibrations in several typical cities in China by the Railway Labor Hygiene Research Institute of the Ministry of Railways, in the area within 30 meters from the center line of the track, the vibration levels are mostly close to 80 decibels. Such high-level vibrations and noises have greatly affected the daily life and physical and mental health of residents along the railway.

[0045] In Example 4, the piezoelectric phononic crystal beam acts as a vibration isolation beam and is directly laid under the track to achieve the effect of vibration reduction and noise reduction. The unit cells are arranged horizontally in a one-dimensional period of 1×15, as Figure 3 and Figure 4 shown. The size parameters are as follows: the lattice constant is 0.105 m, the length of the major semi-axis of the inner ellipse is 0.05 m, the width of the unit cell model is 0.105 m, the length of the minor semi-axis of the inner ellipse is 0.032 m, the radius of the fillet is 0.01 m, the distance between adjacent coatings is 0.015 m, the edge width of the matrix layer is 0.004 m, the length of the rectangle at the four corners of the matrix layer is 0.005 m, the width of the left local oscillator is 0.01 m, the width of the middle local oscillator is 0.01 m, the width of the right local oscillator is 0.01 m, the length of the left local oscillator is 0.005 m, the length of the middle local oscillator is 0.005 m, the length of the right local oscillator is 0.005 m, and the thickness of the unit cell is 0.00285 m. The material parameters are as follows: the material parameters of epoxy resin are density = 1180 kg / m 3 , Poisson's ratio is 0.368, and Young's modulus is 4.08e 10 Pa; the material parameters of PZT-4 are density = 7500 kg / m 3 , elastic constant c 11 = 132 GPa, piezoelectric constant e 31 = -4.1 Cm -2 , dielectric constant is 7.124e -9 CV -1 m -1 ; the density of copper = 8950 kg / m 3 , Young's modulus is 16.46e 10 Pa, and Poisson's ratio is 0.35.

[0046] As Figure 11 shown, the calculation results show that the band structure diagram of the unit cell indicates that the unit cell opens a wide band gap in the range of 2635 - 4978 Hz, and at the same time opens four small band gaps in the range of 1300 Hz - 2500 Hz. These band gaps are in good agreement with the attenuation frequency domain of the transmission curve diagram, as Figure 12 shown, and its maximum transmission ratio reaches 527 dB. This indicates that the piezoelectric phononic crystal beam performs excellently in controlling the propagation of vibration in the plane and effectively blocks the propagation of high-frequency vibration in transportation. To further verify the vibration frequency control effect of the phononic crystal beam within the band gap, taking 3000 Hz as an example, the propagation process of vibration is simulated with simulation software, as Figure 13 shown. The observation results show that after the vibration passes through the phononic crystal beam, its propagation is significantly suppressed, further verifying its effectiveness in controlling high-frequency vibration in transportation.

[0047] In the description of the present utility model, the orientation or positional relationship indicated by terms such as "middle", "left", "right", "inside", "outside", etc. is based on the schematic position in the drawings or the common placement mode of the product in actual use. These terms are intended to simplify the description of the present utility model and do not mean that the device or component must be constructed or operated in a specific orientation.

[0048] The preferred embodiments of the present utility model have been described in detail above, but the present utility model is not limited to these specific details. Within the technical concept of the present utility model, various equivalent transformations can be made to the technical solutions, and these transformations are all within the protection scope of the present utility model. In addition, it should be noted that each technical feature described in the specific embodiments can be combined with parameters in any appropriate manner without conflict. To avoid unnecessary repetition, the present utility model does not list all possible parameter combination modes separately.

Claims

1. A piezoelectric phonon crystal beam based on DNA structure, characterized in that, It includes piezoelectric phononic crystal unit cells horizontally and periodically arranged in a one-dimensional direction. The piezoelectric phononic crystal unit cell includes a matrix layer (1) formed by connecting two semi-elliptical matrices back to back, a coating pair (2) periodically arrayed along the one-dimensional direction of the matrix layer and oppositely arranged inside the arc sides of the semi-elliptical matrix, and a local oscillator (3) located between each pair of coating pairs. A plurality of coating pairs form a coating layer, and a plurality of local oscillators form a scatterer layer.

2. The piezoelectric phonon crystal beam based on the DNA structure according to claim 1, wherein: The lattice constant of the piezoelectric phononic crystal unit cell is 0.01 m to 1 m, and the cell thickness is 1.5e -6 m to 1e -3 m.

3. A piezoelectric phonon crystal beam based on the DNA structure according to claim 1, characterized in that: The width of the local oscillator is 0.005 m to 0.02 m, and the length of the local oscillator is 0.0025 m to 0.02 m.

4. The piezoelectric phonon crystal beam based on the DNA structure according to claim 1, wherein: The matrix layer, the coating pair, and the local oscillator have the same thickness.

5. A piezoelectric phonon crystal beam based on the DNA structure according to claim 1, characterized in that: The volume of the coating pair decreases sequentially from the outside of the unit cell to the central symmetry line.

6. The piezoelectric phonon crystal beam based on the DNA structure according to claim 1, wherein: The volumes of a plurality of local oscillators are the same or different.

7. The piezoelectric phonon crystal beam based on the DNA structure according to claim 1, wherein: There are rigid connections between the matrix layer, the coating pair, and the local oscillator.

8. A piezoelectric phonon crystal beam based on DNA structure according to claim 1, characterized in that: The matrix layer is a structure made of an elastic material.

9. The piezoelectric phonon crystal beam based on the DNA structure according to claim 1, wherein: The coating layer is a structure made of a thermoplastic material.

10. A piezoelectric phonon crystal beam based on the DNA structure according to claim 1, characterized in that: The scatterer layer is a structure made of a piezoelectric material.

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