CN210015704U - Phononic crystal sound-proof screen - Google Patents
Phononic crystal sound-proof screen Download PDFInfo
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- CN210015704U CN210015704U CN201920643107.6U CN201920643107U CN210015704U CN 210015704 U CN210015704 U CN 210015704U CN 201920643107 U CN201920643107 U CN 201920643107U CN 210015704 U CN210015704 U CN 210015704U
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Abstract
The application discloses a phononic crystal sound-proof screen, which comprises a hard medium layer, a soft medium layer and a generalized phononic crystal column; the soft medium layer is positioned between the two hard medium layers; the generalized phononic crystal columns are periodically distributed in the soft medium layer; the generalized phononic crystal column consists of at least two periodic components which are mutually attached and a cavity at the center; the periodic elements are sequentially a non-metal layer and a metal layer from inside to outside. The phononic crystal sound-proof screen that this application embodiment provided has coupled the multiple mechanism of making an uproar of falling and has fallen, will carry out the effectual decay of noise, has solved among the prior art that the mechanism of making an uproar of falling single lead to the not good technical problem of noise reduction, compares prior art, reaches better noise reduction.
Description
Technical Field
The application relates to the technical field of sound insulation screens, in particular to a phononic crystal sound insulation screen.
Background
The noise pollution inevitably affects the normal life of people in the surrounding environment, and the reduction of the noise pollution is of great significance for improving the living environment of people. The sound-proof screen is used as the most easily-realized and most economical control mode in noise control, and can effectively reduce noise pollution.
At present, the sound barrier adopts the mode of phononic crystal to design mostly, welds a plurality of phononic crystals at the regional surface that needs syllable-dividing among the prior art and reaches syllable-dividing effect usually, and its mechanism of making an uproar that falls is comparatively single, consequently, technical staff in the field can also optimize the sound barrier to reach better noise reduction effect.
SUMMERY OF THE UTILITY MODEL
An object of this application is to provide a phononic crystal sound-proof barrier, solves among the prior art and makes an uproar the mechanism of making an uproar singly leads to the not good technical problem of noise reduction effect.
In view of the above, the present application provides a phononic crystal sound-proof screen, which includes a hard dielectric layer, a soft dielectric layer and a generalized phononic crystal column;
the soft medium layer is positioned between the two hard medium layers;
the generalized phononic crystal columns are periodically distributed in the soft medium layer;
the generalized phononic crystal column consists of at least two periodic components and a central cavity which are mutually attached;
the period components are sequentially a non-metal layer and a metal layer from outside to inside.
Preferably, the hard medium layer is provided with a plurality of holes.
Preferably, the hard medium layer is specifically an aluminum plate, a steel plate or an iron plate.
Preferably, the surface of the hard medium layer is coated with an anticorrosive paint.
Preferably, the soft medium layer is made of a porous sound-absorbing material.
Preferably, the soft medium layer is specifically sound-absorbing cotton or sound-absorbing fiber.
Preferably, the number of the cycle components is 3.
Preferably, the non-metal layer is made of a composite polymer material.
Preferably, the metal layer is made of an aluminum alloy material.
Compared with the prior art, the embodiment of the application has the advantages that:
in the embodiment of the application, the phononic crystal sound-proof screen comprises a hard medium layer, a soft medium layer and a generalized phononic crystal column; the soft medium layer is positioned between the two hard medium layers; the generalized phononic crystal columns are periodically distributed in the soft medium layer; the generalized phononic crystal column consists of at least two periodic components which are mutually attached and a cavity at the center; the periodic elements are sequentially a non-metal layer and a metal layer from inside to outside.
The hard medium layer is used for stabilizing the structure of the whole phononic crystal sound-proof screen and realizing first-layer noise reduction; the soft medium has higher attenuation degree to sound than the hard medium, so the soft medium plays a role in second layer noise reduction; the generalized phononic crystal columns are periodically distributed in the soft medium layer, so that sound waves are reflected and interfered among the generalized phononic crystal columns, and the third layer of noise reduction is realized; the generalized photonic crystal column is internally composed of at least two periodic components and a central cavity which are mutually attached to form a Helmholtz resonant cavity, so that the noise reduction of the fourth layer is realized.
Therefore, the phononic crystal sound-proof screen that this application embodiment provided has coupled the multiple noise reduction mechanism and has fallen the noise, carries out effectual decay with the noise, has solved among the prior art that the noise reduction mechanism is single to lead to the not good technical problem of noise reduction effect, compares prior art, reaches better noise reduction effect.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a transverse cross-sectional view of a phononic crystal acoustic barrier provided by an embodiment of the present application;
FIG. 2 is a longitudinal cross-sectional view of a phononic crystal acoustic barrier provided by an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a phononic crystal acoustic barrier provided by an embodiment of the present application;
FIG. 4 is a schematic diagram of a generalized phononic crystal column of a phononic crystal acoustic barrier provided by an embodiment of the present application;
FIG. 5 is a cross-sectional view of a generalized phononic crystal column of a phononic crystal acoustic barrier provided by an embodiment of the present application;
FIG. 6 is an energy plot of the noise effect after placement of a phononic crystal septum provided by an embodiment of the present application;
fig. 7 is an energy plot of the noise effect without the phononic crystal acoustic barrier provided by an embodiment of the present application.
Reference numerals: a hard dielectric layer 1; a hole 2; a soft medium layer 3; a generalized phononic crystal column 4; a non-metal layer 41; a metal layer 42; a central cavity 43.
Detailed Description
The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Please refer to fig. 1 to 3.
The embodiment of the application provides a phononic crystal sound-proof screen, which comprises a hard medium layer 1, a soft medium layer 3 and a generalized phononic crystal column 4.
The hard medium layer 1 is positioned on the outermost layer of the whole phononic crystal sound-proof screen, and mainly plays a role in stabilizing the structure of the whole phononic crystal sound-proof screen and plays a role in noise reduction of the first layer to a certain extent.
The soft medium layer 3 is positioned between the two hard medium layers 1, and the attenuation degree of the soft medium to sound is larger than that of the hard medium, so that the soft medium layer 3 plays a role in noise reduction of a second layer on the first aspect, and is used for installing the generalized phononic crystal column 4 on the second aspect.
The generalized phonon crystal columns 4 are periodically distributed in the soft medium layer 3, when sound waves pass through the generalized phonon crystal columns 4 periodically distributed according to a specific rule, a multiple scattering effect occurs, the sound waves are continuously reflected, the reflected sound waves interfere, and the energy of the sound waves is greatly consumed due to the interference effect, so that the generalized phonon crystal columns periodically distributed play a role in third-layer noise reduction. The center frequency of the lowest acoustic wave forbidden band can be approximately determined by the sound velocity of the matrix and the lattice constant a (distance between generalized phononic crystals). Therefore, different lattice constants a can be determined for optimal effect according to the main frequency ranges of different noise environments. Preferably, the distances between adjacent generalized phononic crystal columns are equal, and at least two layers are arranged (one layer is formed by arranging the single generalized phononic crystal columns at a preset distance). In the embodiment of the application, 4 layers of generalized phononic crystal columns are arranged, and the adjacent generalized phononic crystal columns form an equilateral triangle (which can also form a rectangle). Because the phononic crystal sound-proof screen in the embodiment of the application is of a plate-shaped structure, the hard medium layer 1, the soft medium layer 3 and the generalized phononic crystal column 4 are all arranged in parallel.
Referring to fig. 4 and 5, the generalized photonic crystal pillar 4 is specifically composed of at least two periodic elements and a central cavity 43, which are attached to each other, wherein the periodic elements are a non-metal layer 41 and a metal layer 42 in sequence from outside to inside. The innermost metal layer 42 of each generalized photonic crystal column 4 and the central cavity 43 form a helmholtz resonator, which has a good sound absorption effect in the low frequency range. According to classical helmholtz theory, helmholtz resonance sound absorption frequency is mainly determined by the volume of the resonant cavity, so that when the main frequency of the target noise environment is determined, the optimal sound absorption effect can be obtained by optimizing the periodic components and the volume of the resonant cavity of the generalized phononic crystal column 4, which is the fourth layer noise reduction.
The phononic crystal sound-proof screen provided by the embodiment of the application comprises a hard medium layer, a soft medium layer and a generalized phononic crystal column; the soft medium layer is positioned between the two hard medium layers; the generalized phononic crystal columns are periodically distributed in the soft medium layer; the generalized phononic crystal column consists of at least two periodic components which are mutually attached and a cavity at the center; the periodic elements are sequentially a non-metal layer and a metal layer from inside to outside. The phononic crystal sound-proof screen that this application embodiment provided has coupled the multiple mechanism of making an uproar of falling and has fallen, will carry out the effectual decay of noise, has solved among the prior art that the mechanism of making an uproar of falling single lead to the not good technical problem of noise reduction, compares prior art, reaches better noise reduction.
The phononic crystal sound-proof screen provided by the embodiment of the application can be further optimized, for example, the hard medium layer 1 is provided with the holes 2. When sound passes through the sound insulation screen, the holes 2 on the surface of the hard medium layer 1 form a micro-perforated sound absorption effect, and a further sound absorption effect is achieved. The distribution of the holes 2 on the surface of the hard medium layer 1 can be set to different distribution standards according to the use requirement, and the uniform distribution structure is adopted in the application.
The hard medium layer 1 is mainly used for supporting the whole phononic crystal sound insulation screen, and can be an aluminum plate, a steel plate or an iron plate. Preferably, the coating also has certain functions of corrosion prevention, fire prevention and water prevention, for example, an anticorrosive coating is coated on the surface of the hard medium layer 1.
The soft medium layer 3, which serves as a second noise reduction layer, is preferably made of a porous sound absorbing material, such as sound absorbing cotton, suction fibers, or the like.
The periodic components of the generalized photonic crystal column 4 include a metal layer 42 and a non-metal layer 41, wherein the non-metal layer 41 is specifically made of a composite polymer material, and the metal layer 42 is made of an aluminum alloy material. The number of the period components is 3. Of course, different materials can achieve different effects, and the embodiment of the application only provides a feasible scheme.
The following is a noise reduction effect test simulated by a two-dimensional simulation method for the phononic crystal sound-proof screen provided in the embodiment of the present application, please refer to fig. 6 and 7.
Fig. 6 is an energy chart showing the noise effect after placing the soundproof screen according to the embodiment of the present invention, and fig. 6 is a two-dimensional model of an indoor noise source, each having a length and a width of 4m, having an opening with a width of 2m in front of a room, having two noise sources in the room, radiating sound waves with a frequency of 315 Hz. Outside the opening of the room a sound barrier as proposed in the present application is placed. It can be seen that the noise is essentially intercepted at the exit of the room after being radiated from the noise source, and the acoustic energy is confined to the room and eventually absorbed.
Fig. 7 is an energy plot of the noise effect without the acoustic barrier provided by the embodiments of the present application. It can be seen that a significant portion of the acoustic energy radiates directly out through the opening in the room.
Through the simulation, the sound insulation screen provided by the application is added at the opening of a room, so that the sound can be effectively insulated.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (9)
1. A phononic crystal sound-proof screen is characterized by comprising a hard medium layer, a soft medium layer and a generalized phononic crystal column;
the soft medium layer is positioned between the two hard medium layers;
the generalized phononic crystal columns are periodically distributed in the soft medium layer;
the generalized phononic crystal column consists of at least two periodic components and a central cavity which are mutually attached;
the period components are sequentially a non-metal layer and a metal layer from outside to inside.
2. The phononic crystal acoustic baffle of claim 1 wherein the hard dielectric layer is provided with a plurality of holes.
3. The phononic crystal sound barrier of claim 1, wherein the hard dielectric layer is specifically an aluminum plate, a steel plate, or an iron plate.
4. The phononic crystal acoustic baffle of claim 1 wherein a surface of the hard dielectric layer is coated with an anticorrosive paint.
5. The phononic crystal acoustic baffle of claim 1 wherein the layer of soft media is made of a porous sound absorbing material.
6. The phononic crystal acoustic screen of claim 5 wherein the soft dielectric layer is specifically sound absorbing cotton or sound absorbing fiber.
7. The phononic crystal acoustic baffle of claim 1 wherein the number of said periodic elements is 3.
8. The phononic crystal acoustic baffle of claim 1 wherein the non-metallic layer is made of a composite polymeric material.
9. The phononic crystal acoustic baffle of claim 1 wherein the metal layer is specifically made of an aluminum alloy material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920643107.6U CN210015704U (en) | 2019-05-07 | 2019-05-07 | Phononic crystal sound-proof screen |
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| CN201920643107.6U CN210015704U (en) | 2019-05-07 | 2019-05-07 | Phononic crystal sound-proof screen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111667807A (en) * | 2020-05-27 | 2020-09-15 | 武汉大学 | Composite phononic crystal structure and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111667807A (en) * | 2020-05-27 | 2020-09-15 | 武汉大学 | Composite phononic crystal structure and preparation method thereof |
| CN111667807B (en) * | 2020-05-27 | 2023-06-02 | 武汉大学 | Composite phonon crystal structure and preparation method thereof |
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