Phononic unit cell, phononic crystal, vibration reduction assembly and acoustic device
By asymmetrically distributing notches on the phonon unit cell matrix and using scatterers, the symmetry is broken, the propagation path and scattering mode of the sound waves are enhanced, the problem of limited frequency range of the phonon unit cell is solved, and a wider range of vibration control effects is achieved.
Patent Information
- Application Number
- CN202421236505.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-09-09
- Estimated Expiration
- 2034-05-31
AI Technical Summary
Existing phononic unit cells can only achieve effective vibration control within a limited frequency range, limiting their application in a wider frequency range, especially in the field of speakers, affecting sound quality and durability.
The gaps are asymmetrically distributed on the matrix of the phonon unit cell. The gaps include a first and a second connected opening segment. The first opening segment is tilted near the middle, and the second opening segment is symmetrically distributed near the edge. In combination with the use of scatterers, the symmetry of the matrix is broken to increase complexity and variation, thereby forming a wider frequency range or a deeper band gap depth.
The frequency range of the phonon unit cell is broadened, achieving a wider range of vibration control and improving the sound quality and durability of the speaker.
Smart Images
Figure CN223321001U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of vibration reduction technology, and in particular to a phononic unit cell, a phononic crystal, a vibration reduction component, and an acoustic device. Background Art
[0002] Phononic crystals are composed of multiple phonon cells arranged periodically. This periodic arrangement determines the propagation characteristics of sound waves or elastic waves within them. When the phonon cell is a symmetrical structure, its internal vibration mode and wave scattering mechanism will also show corresponding symmetry. Such symmetrical structural protection may cause waves within certain frequency ranges to propagate more freely without forming band gaps, resulting in the phonon cell being able to achieve effective vibration control only within a limited frequency range, limiting the application of the phonon cell to a wider frequency range. For example, in the field of speakers, vibration is a key factor affecting sound quality and durability. If the phononic crystal cannot achieve effective vibration control at these frequencies, it is easy to cause the speaker to generate unnecessary noise or vibration, and it is easy to cause distortion or degradation of the speaker sound quality, affecting the user experience. Utility Model Content
[0003] Based on this, the embodiments of the present application provide a phononic unit cell, a phononic crystal, a vibration reduction component and an acoustic device, which are used to solve the problem that the existing phononic unit cell can only achieve effective vibration control within a limited frequency range.
[0004] In order to solve the above technical problems, the embodiment of the present application provides a phonon unit cell, which adopts the following technical solution:
[0005] A phononic unit cell includes a substrate;
[0006] The base is provided with a plurality of notches, and the notches are asymmetrically distributed on the base.
[0007] Furthermore, the notch includes a first opening section and a second opening section that are connected;
[0008] The first opening sections are arranged close to the middle of the base, and the first opening sections are asymmetrically distributed around the middle of the base;
[0009] The second opening sections are arranged close to the edge of the base, and the second opening sections are symmetrically distributed around the middle of the base.
[0010] Furthermore, the first opening section is arranged to be inclined in a vertical direction toward the edge relative to the middle of the base body;
[0011] and / or, the second opening section is larger than the first opening section;
[0012] and / or, the contour line of the cross section of the first opening section is parabolic;
[0013] And / or, the contour line of the cross section of the second opening section is parabolic.
[0014] Furthermore, the notch is arranged obliquely relative to the middle of the base body toward the edge;
[0015] Furthermore, the two ends of the notch respectively have an open end and a closed end, the open end is arranged close to the edge of the base, and the closed end is arranged close to the middle of the base;
[0016] Furthermore, the outline of the cross section of the notch is parabolic.
[0017] Furthermore, the notches are asymmetrically distributed around the middle of the base;
[0018] And / or, a central hole is opened in the middle of the base;
[0019] And / or, the matrix is a first elastomer.
[0020] Furthermore, the phonon unit cell further includes a scatterer embedded in the substrate;
[0021] The scattering body is distributed around the middle of the base body.
[0022] Furthermore, the scatterers are symmetrically distributed around the middle of the substrate; and / or,
[0023] At least one gap is provided between two adjacent scatterers; and / or,
[0024] The scatterer is a second elastic body.
[0025] In order to solve the above technical problems, the embodiment of the present application further provides a phononic crystal, which adopts the following technical solution:
[0026] A phononic crystal comprises the phononic unit cell described above.
[0027] In order to solve the above technical problems, the embodiment of the present application further provides a vibration reduction assembly, which adopts the following technical solution:
[0028] A vibration reduction component, applied to an acoustic device, comprises the phononic unit cell or the phononic crystal as described above.
[0029] In order to solve the above technical problems, the embodiment of the present application further provides an acoustic device, which adopts the following technical solution:
[0030] An acoustic device comprises the vibration reduction assembly described above.
[0031] Compared with the prior art, the embodiments of the present application have the following main beneficial effects: the present application can broaden the frequency range of the phonon unit cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0032] In order to more clearly illustrate the solution of the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0033] Figure 1 1 is a schematic structural diagram of a phonon unit cell according to an embodiment of the present application;
[0034] Figure 2 is a schematic structural diagram of another embodiment of a phonon unit cell according to an embodiment of the present application;
[0035] Figure 3 is a schematic structural diagram of a phononic crystal according to an embodiment of the present application;
[0036] Figure 4 is a schematic structural diagram of a vibration reduction assembly according to an embodiment of the present application;
[0037] Figure 5 1 is a transmission loss curve of the phononic crystal in the vibration reduction assembly according to an embodiment of the present application.
[0038] Reference numerals:
[0039] 100, phononic unit cell; 110, substrate; 111, notch; 1111, first opening section; 1112, second opening section; 1113, open end; 1114, closed end; 112, center hole; 120, scatterer; 200, phononic crystal; 300, vibration reduction assembly; 310, mounting plate. DETAILED DESCRIPTION
[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.
[0041] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0042] See Figure 1 and Figure 2 An embodiment of the present application provides a phononic unit cell 100 , including a substrate 110 ; the substrate 110 is provided with a plurality of notches 111 , and the notches 111 are asymmetrically distributed on the substrate 110 .
[0043] The present application opens multiple gaps 111 in the matrix 110 to introduce additional boundaries and interfaces in the matrix 110 through the gaps 111, thereby forming additional scattering sources, so that when the wave propagates to the gap 111, part of the wave is reflected back, part of the wave will bypass the gap 111 and continue to propagate, and part of the wave will undergo complex scattering and interference inside the gap 111. In this way, these multiple reflection and scattering processes can further enhance the role of the gap 111 as a scattering source and change the propagation path and scattering mode of the wave; based on this, by asymmetrically distributing the gaps 111 on the matrix 110, breaking the symmetry of the original structure of the matrix 110, and introducing more complexity and changes on the matrix 110, the propagation path and scattering mode of the sound wave or elastic wave are more diversified, which helps to form a band gap structure with a wider frequency range or a deeper band gap depth, thereby forming a new band gap in the band structure of the phonon unit cell 100 or changing the original band gap characteristics, so that the phonon unit cell 100 has a wider frequency range.
[0044] In some embodiments, see Figure 1 The notch 111 includes a first opening section 1111 and a second opening section 1112 that are connected to each other; the first opening section 1111 is arranged near the middle of the base 110, and the first opening sections 1111 are asymmetrically distributed around the middle of the base 110; the second opening section 1112 is arranged near the edge of the base 110, and the second opening sections 1112 are symmetrically distributed around the middle of the base 110.
[0045] It can be understood that the first opening sections 1111 are asymmetrically distributed around the middle of the substrate 110 to introduce more complexity and changes in the substrate 110, making the wave propagation path and scattering mode more diverse, which helps to achieve effective scattering and regulation in a wider frequency range.
[0046] Secondly, when the second opening sections 1112 symmetrically distributed on the substrate 110 work together with the asymmetric first opening sections 1111, the first opening sections 1111 make the wave propagation path and scattering mode more diversified through their asymmetric layout; and the second opening sections 1112 introduce ordered elements into this diversified wave propagation environment. The combination of the two causes the wave to experience rich scattering and interference processes during propagation, which further helps to form a band gap structure with a wider frequency range or a deeper band gap depth, further broadening the frequency range of the phonon unit cell 100.
[0047] Further, see Figure 1 , the first opening section 1111 is tilted relative to the vertical direction of the middle portion of the substrate 110 toward the edge. In this way, on the one hand, the notches 111 tilted on the substrate 110 introduce more directional and angular changes to the propagation of waves, which helps to form a bandgap structure with a wider frequency range or a deeper bandgap depth, thereby improving the acoustic performance of the phonon unit cell 100; on the other hand, the design of the tilted first opening sections 1111 increases the degree of freedom in the design of the phonon unit cell 100. By designing the tilt angle, size, and distribution of each first opening section 1111 on the substrate 110, the scattering and bandgap characteristics of the phonon unit cell 100 can be flexibly controlled, thereby achieving a more precise bandgap structure.
[0048] Further, see Figure 1 The second opening section 1112 is larger than the first opening section 1111. Thus, on the one hand, the larger second opening section 1112 can further reduce the weight of the substrate 110, which is conducive to the lightweight design of the substrate 110; on the other hand, the larger second opening section 1112 can allow more waves of different frequencies to enter and interact with the inner wall surface of the second opening section 1112, thereby achieving effective scattering and control over a wider frequency range.
[0049] Further, see Figure 1 The cross-sectional profile of the first opening section 1111 is parabolic. As can be understood, a parabola is a smooth curve. This continuous curved surface design allows sound waves to change their propagation direction more evenly and gradually when encountering a parabolic surface, thereby reducing scattering and energy dispersion caused by interface discontinuities during sound wave reflection.
[0050] Further, see Figure 1 The cross-sectional profile of the second opening section 1112 is parabolic. As can be understood, a parabola is a smooth curve. This continuous curved surface design allows sound waves to change their propagation direction more evenly and gradually when encountering the parabolic surface, thereby reducing scattering and energy dispersion caused by interface discontinuities during sound wave reflection.
[0051] In other embodiments, see Figure 2 The notches 111 are tilted relative to the center of the substrate 110 toward the edge. Thus, on the one hand, the tilted notches 111 on the substrate 110 introduce more directional and angular variations to wave propagation, helping to form a bandgap structure with a wider frequency range or a deeper bandgap depth, thereby improving the acoustic performance of the phonon unit cell 100. On the other hand, the design of the tilted notches 111 increases the degree of freedom in the design of the phonon unit cell 100. By designing the tilt angle, size, and distribution of each notch 111 on the substrate 110, the scattering and bandgap characteristics of the phonon unit cell 100 can be flexibly controlled, thereby achieving a more precise bandgap structure.
[0052] In other embodiments, see Figure 2 The notch 111 has an open end 1113 and a closed end 1114 that are oppositely disposed. The open end 1113 is disposed near the edge of the substrate 110, and the closed end 1114 is disposed near the middle of the substrate 110. In this manner, the notch 111 extends from the edge of the substrate 110 to the middle of the substrate 110, thereby occupying a larger space on the substrate 110. The notch 111 introduces more additional boundaries and interfaces into the substrate 110, thereby increasing the likelihood of wave scattering and interference, thereby facilitating a more extensive change in the wave propagation path and scattering mode, and further broadening the frequency range of the phononic unit cell 100.
[0053] Secondly, since the open end 1113 is close to the edge of the substrate 110, the sound waves or elastic waves are more easily captured by the edge of the notch 111 and cause scattering when they propagate near the notch 111, while the closed end 1114 is close to the middle of the substrate 110, which helps to form a complex reflection and scattering path inside the notch 111, further enhancing the scattering effect.
[0054] In one example, see Figure 2 The closed end 1114 is located on one lateral side of the middle portion of the substrate 110. That is, the notch 111 extends from the edge of the substrate 110 to one lateral side of the middle portion of the substrate 110. This further increases the space occupied by the notch 111 on the substrate 110, thereby further increasing the possibility of wave scattering and interference. The lateral direction is a direction parallel to the horizontal direction of the substrate 110, such as the X direction in the drawings.
[0055] In another example, the closed end 1114 is located on one longitudinal side of the middle portion of the base 110, that is, the notch 111 extends from the edge of the base 110 to one longitudinal side of the middle portion of the base 110. This not only increases the possibility of heat dissipation and interference of waves by utilizing the notch 111, but also reduces the space occupied by the notch 111 on the base 110 compared to the arrangement of "the closed end 1114 being located on one lateral side of the middle portion of the base 110" in the above example, thereby improving the overall structural stability of the base 110. The longitudinal direction is a direction parallel to the vertical direction of the base 110, such as the Y direction in the figures.
[0056] In other embodiments, see Figure 2 The cross-sectional profile of the notch 111 is parabolic.
[0057] Understandably, a parabola is a smooth curve. Such a continuous curved surface design enables sound waves to change their propagation direction more evenly and gradually when encountering a parabolic surface, thereby reducing scattering and energy dispersion caused by interface discontinuities during sound wave reflection.
[0058] In some embodiments, see Figure 1 and 2 The notches 111 are asymmetrically distributed around the middle of the substrate 110, so that when the wave passes through the notches 111, its propagation path and scattering mode in the middle area of the substrate 110 change significantly, thereby regulating the propagation effect of the middle area of the substrate 110 to achieve more complex wave control.
[0059] In some embodiments, see Figure 1 and 2 A central hole 112 is formed in the middle of the base 110 .
[0060] It can be understood that the setting of the central hole 112 reduces the mass and stiffness of the middle part of the substrate 110, causing the resonance frequency of the middle part of the substrate 110 to change, thereby destroying the original central resonance point of the substrate 110; and the central hole 112 introduces additional boundaries and interfaces to the middle part of the substrate 110, forming a new scattering source, so as to change the propagation path and scattering mode of the wave when the wave passes through the central hole 112.
[0061] In some embodiments, see Figure 1 and 2 The base 110 is a first elastic body, so that the base 110 has good elasticity and anti-compression deformation capabilities.
[0062] Preferably, the first elastomer is a two-dimensional tetragonal lattice type silicone rubber; in this way, the silicone rubber not only has good elasticity and flexibility, but also has excellent high temperature resistance, oxidation resistance, ozone resistance, radiation resistance and good electrical insulation properties, and its unique molecular chain structure gives it good elasticity and resistance to compression deformation.
[0063] Secondly, the two-dimensional tetragonal lattice type makes the phononic unit cell 100 structurally periodic and symmetrical. This periodic structure allows the phononic unit cell 100 to regulate wave propagation within a specific frequency range. Within a certain frequency range, wave propagation will be blocked, while in other frequency ranges, wave propagation can be losslessly transmitted, which helps the phononic unit cell 100 achieve vibration and noise reduction.
[0064] In some embodiments, see Figure 1 and 2 The phononic unit cell 100 further includes a scatterer 120 embedded in the base 110 ; the scatterer 120 is distributed around the middle of the base 110 .
[0065] It can be understood that the scatterers 120 are distributed around the middle of the substrate 110, providing more scattering points for sound waves or elastic waves; and these scatterers 120 will work together with the gaps 111 in the substrate 110 to scatter and reflect the waves multiple times, thereby further changing the propagation path and scattering mode of the waves, helping to achieve wave regulation within a wider frequency range, and being able to form a bandgap structure with a wider frequency range or a deeper bandgap depth.
[0066] Secondly, the addition of the scatterer 120 further breaks the symmetry of the original structure of the matrix 110, making the structure of the phonon unit cell 100 more complex, which helps to form more band gaps in the energy band structure of the phonon unit cell 100 or change the original band gap characteristics, thereby achieving more precise control of sound waves or elastic waves.
[0067] In some embodiments, see Figure 1 and 2 The scatterers 120 are symmetrically distributed around the center of the base 110. This ensures balanced forces on the base 110 in all directions, allowing the base 110 to withstand greater external loads and vibrations without damage, thereby improving the structural stability of the phononic unit cell 100. Furthermore, it ensures consistent and uniform scattering effects during wave propagation in all directions on the base 110, thereby facilitating more precise control of wave propagation characteristics.
[0068] In some embodiments, see Figure 1 and 2At least one gap 111 is provided between two adjacent scatterers 120. This, on the one hand, further increases the number of scattering sources encountered by the wave during propagation, causing the wave to experience more intense scattering and reflection when passing through the phononic unit cell 100, further increasing the diversity and complexity of the wave propagation path; on the other hand, providing the gap 111 between two scatterers 120 can improve the accuracy of the phononic unit cell 100 in controlling acoustic or elastic waves.
[0069] In some embodiments, see Figure 1 and 2 The scatterer 120 is a second elastomer, so that the scatterer 120 interacts with the matrix 110, thereby enhancing the ability of the phonon unit cell 100 to regulate elastic waves (sound waves or vibrations). This regulation ability is reflected in the ability to more effectively form a band gap, prevent the propagation of elastic waves within a specific frequency range, or guide the propagation of elastic waves in a specific direction.
[0070] Preferably, the second elastic body is structural steel. Due to its high elastic modulus and density, structural steel can produce a stronger acoustic impedance difference in the phononic unit cell 100. This difference can enhance the band gap effect of the phononic unit cell 100 and better prevent the propagation of elastic waves within a specific frequency range. Therefore, when external vibrations or sound waves act on the phononic unit cell 100, the structural steel scatterer 120 can effectively disperse or reflect the energy of the vibration or sound wave, thereby reducing the energy transmitted to the base 110 and achieving an improved vibration reduction effect.
[0071] See Figures 1 to 3 , an embodiment of the present application provides a phononic crystal 200, including the phononic unit cell 100 as described above.
[0072] It can be understood that the phononic crystal 200 includes a plurality of phononic unit cells 100, and the plurality of phononic unit cells 100 are connected to form the phononic crystal 200; a plurality of gaps 111 are opened on the matrix 110 in the phononic unit cell 100, so as to introduce additional boundaries and interfaces in the matrix 110 through the gaps 111, thereby forming additional scattering sources, so that when the wave propagates to the gap 111, part of the wave is reflected back, part of the wave will bypass the gap 111 and continue to propagate, and another part of the wave will undergo complex scattering and interference inside the gap 111, so that these multiple reflection and scattering processes can be further The role of the notch 111 as a scattering source is enhanced, and the propagation path and scattering mode of the wave are changed; based on this, by asymmetrically distributing the notches 111 on the substrate 110, the symmetry of the original structure of the substrate 110 is broken, so as to introduce more complexity and changes on the substrate 110, so that the propagation path and scattering mode of the sound wave or elastic wave are more diversified, which helps to form a band gap structure with a wider frequency range or a deeper band gap depth, and realizes the formation of a new band gap in the band structure of the phonon unit cell 100 or changes the original band gap characteristics, so that the phonon unit cell 100 has a wider frequency range.
[0073] Furthermore, since the phononic crystal 200 is a periodic artificial structure and the materials are assumed to be elastic, only the phononic unit cell structure needs to be analyzed. According to Bloch's theorem, its governing equation is:
[0074] u(r)=e i(k*r) u k (r)
[0075] Where r is the position vector, k is the first irreducible Brillouin zone wave vector, u(r) is the nodal displacement field function with the same periodicity as the phonon unit cell structure, and e i(k*r) It represents the transmission of plane waves, and i is an imaginary number.
[0076] For the unit node, the stiffness matrix and node matrix are established, and the eigenvalue equation of the phonon unit cell is:
[0077] (K-ω 2 M)U=0
[0078] Where K is the stiffness matrix, ω is the angular frequency, M is the mass matrix, and U is the eigenvector.
[0079] According to Bloch's theorem, the displacement of the outer boundary of the phonon unit cell satisfies the following formula:
[0080] u(r+a)=e i(k*r) u k (r)
[0081] Wherein, r is the position vector of the node, a is the lattice basis vector of the phononic crystal 200, r is the position vector, k is the first irreducible Brillouin zone wave vector, and u(r+a) is the lattice distance of the phononic crystal 200 periodically extended outward a.
[0082] See Figures 1 to 4 An embodiment of the present application provides a vibration reduction assembly 300 for use in an acoustic device, including the phononic unit cell 100 described above, or the phononic crystal 200 described above.
[0083] It can be understood that the vibration reduction assembly 300 includes a mounting plate 310 and a phononic unit cell 100 or a phononic crystal 200 embedded in the mounting plate 310 . In this way, multiple gaps 111 are opened on the matrix 110 in the phonon unit cell 100 to introduce additional boundaries and interfaces in the matrix 110 through the gaps 111, thereby forming additional scattering sources, so that when the wave propagates to the gap 111, part of the wave is reflected back, part of the wave will bypass the gap 111 and continue to propagate, and part of the wave will undergo complex scattering and interference inside the gap 111. In this way, these multiple reflection and scattering processes can further enhance the role of the gap 111 as a scattering source and change the propagation path and scattering mode of the wave; based on this, by asymmetrically distributing the gaps 111 on the matrix 110, breaking the symmetry of the original structure of the matrix 110, and introducing more complexity and changes on the matrix 110, the propagation path and scattering mode of the sound wave or elastic wave are more diversified, which helps to form a band gap structure with a wider frequency range or a deeper band gap depth, and realize the formation of a new band gap in the band structure of the phonon unit cell 100 or change the original band gap characteristics, so that the phonon unit cell 100 has a wider frequency range.
[0084] In some examples, the phononic crystal 200 includes 50 phononic unit cells 100, with 5 phononic unit cells 100 arranged in each column and 10 phononic unit cells 100 arranged in each row, presenting a two-dimensional periodically arranged phononic crystal 200 structure, and the phononic crystal 200 structure is connected between two mounting plates 310 to form a vibration damping assembly 300; in this way, each phononic unit cell 100 in the phononic crystal 200 presents 10 periodic vibration damping effects.
[0085] Further, see Figure 5 , Figure 5 The transmission loss curve of the phononic crystal is shown. Figure 5The horizontal axis represents frequency freq, and the vertical axis represents transmission loss TL. As can be seen, the energy band relationship of the phononic crystal 200 unit cell has two band gaps within the frequency range of 0-450 Hz. The first band gap ranges from 62 Hz to 103 Hz, with a full band gap width of 41 Hz; the second band gap ranges from 103 Hz to 389 Hz, with a band gap width of 286 Hz. Thus, the periodically arranged phononic crystal 200 can effectively attenuate mechanical vibrations between 62-103 Hz and 103-389 Hz, giving the phononic crystal 200 a wider frequency range.
[0086] The embodiments described above are only some examples of the present application, rather than all the embodiments. Accordingly, in practical applications, the periodic arrangement of the phononic unit cells 100 in the phononic crystal 200 can be flexibly controlled according to needs to meet the required vibration reduction effect.
[0087] See Figures 1 to 4 , an embodiment of the present application provides an acoustic device, including the vibration reduction assembly 300 as described above.
[0088] In this embodiment, the acoustic device uses the vibration reduction component 300 as described above, which includes a phononic unit cell 100. A plurality of notches 111 are provided on the matrix 110 in the phononic unit cell 100, so as to introduce additional boundaries and interfaces into the matrix 110 through the notches 111, thereby forming additional scattering sources. When a wave propagates to the notches 111, part of the wave is reflected back, part of the wave bypasses the notches 111 and continues to propagate, and another part of the wave undergoes complex scattering and interference inside the notches 111. In this way, these multiple reflection and scattering processes can further improve the acoustic performance. The role of the notch 111 as a scattering source is further enhanced, and the propagation path and scattering mode of the wave are changed; based on this, by asymmetrically distributing the notches 111 on the substrate 110, the symmetry of the original structure of the substrate 110 is broken, so as to introduce more complexity and changes on the substrate 110, making the propagation path and scattering mode of the sound wave or elastic wave more diversified, and helping to form a band gap structure with a wider frequency range or a deeper band gap depth, so as to form a new band gap in the band structure of the phonon unit cell 100 or change the original band gap characteristics, so that the phonon unit cell 100 has a wider frequency range.
[0089] It is understandable that the above-mentioned acoustic device can be a speaker, etc., and is not specifically limited here.
[0090] Obviously, the embodiments described above are only some of the embodiments of the present application, rather than all of the embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present application specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present application.
Claims
1. A phonon unit cell, characterized in that: including a matrix; The base body is provided with a plurality of notches, and the notches are asymmetrically distributed on the base body; The notch includes a first opening section and a second opening section that are connected; The first opening sections are arranged close to the middle of the base, and the first opening sections are asymmetrically distributed around the middle of the base; The second opening sections are arranged close to the edge of the base, and the second opening sections are symmetrically distributed around the middle of the base.
2. The phononic unit cell according to claim 1, wherein The first opening section is arranged to be inclined in a vertical direction toward the edge relative to the middle of the base body; and / or, the second opening section is larger than the first opening section; and / or, the contour line of the cross section of the first opening section is parabolic; And / or, the contour line of the cross section of the second opening section is parabolic.
3. The phonon unit cell according to claim 1, characterized in that The notch is arranged obliquely relative to the middle of the base toward the edge; And / or, both ends of the notch respectively have an open end and a closed end, the open end is arranged close to the edge of the base, and the closed end is arranged close to the middle of the base; And / or, the contour line of the cross section of the notch is parabolic.
4. The phononic unit cell according to any one of claims 1 to 3, characterized in that The notches are asymmetrically distributed around the middle of the base; And / or, a central hole is opened in the middle of the base; And / or, the matrix is a first elastomer.
5. The phononic unit cell according to any one of claims 1 to 3, characterized in that The phonon unit cell further includes a scatterer embedded in the substrate; The scattering body is distributed around the middle of the base body.
6. The phononic unit cell according to claim 5, characterized in that The scatterers are symmetrically distributed around the middle of the substrate; and / or, At least one gap is provided between two adjacent scatterers; and / or, The scatterer is a second elastic body.
7. A phononic crystal, characterized in that: Comprising at least one phononic unit cell according to any one of claims 1 to 6.
8. A vibration reduction component, used in an acoustic device, characterized in that: The method comprises the phononic unit cell according to any one of claims 1 to 6, or the phononic crystal according to claim 7.
9. An acoustic device, characterized in that: Comprising the vibration damping assembly of claim 8.