CN211906945U - Phononic crystal cavity device for controlling low-frequency noise - Google Patents
Phononic crystal cavity device for controlling low-frequency noise Download PDFInfo
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- CN211906945U CN211906945U CN202020191266.XU CN202020191266U CN211906945U CN 211906945 U CN211906945 U CN 211906945U CN 202020191266 U CN202020191266 U CN 202020191266U CN 211906945 U CN211906945 U CN 211906945U
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Abstract
The utility model discloses a photonic crystal cavity device for controlling low-frequency noise, which comprises a cavity body and a plurality of photonic crystal units arranged on the outer surface of the cavity body in a matrix form, wherein two points, namely an excitation input point and an output point, are selected on the outer surface of the cavity body around the periphery of the plurality of photonic crystal units arranged in the matrix form, and the excitation input point and the output point are collinear; the phononic crystal unit comprises a cylindrical scatterer positioned on the upper part and a cylindrical soft coating material layer which is positioned on the lower part and is made of soft coating materials. The advantages are that: the photonic crystal cavity device for controlling the low-frequency noise simulates the automobile carriage by manufacturing the photonic crystal cavity, has simple manufacturing process, and provides an effective solution for the application research of the photonic crystal in the vibration and noise reduction of the automobile.
Description
Technical Field
The utility model relates to a photonic crystal vibration isolation and noise reduction device field, concretely relates to photonic crystal cavity device of control low frequency noise.
Background
The phononic crystal is an artificial periodic medium structure with a phononic band gap, and when the frequency of elastic waves falls within the band gap (forbidden band), the elastic waves cannot pass through the phononic crystal material, so that the vibration isolation and noise reduction effects are achieved. By utilizing the property of band gap, a brand new vibration isolation and noise reduction material can be designed, so that the phononic crystal has wide application prospect in the engineering field.
At present, the mechanism of the phononic crystal has a certain research result, and corresponding devices such as a phononic crystal plate, a phononic crystal beam, a vibration isolator and the like are manufactured. However, the usage rate of the phononic crystal as an excellent vibration isolation and noise reduction device in engineering application is still very low, and the development of a phononic crystal model device serving as a theoretical research foundation is lacked in the prior art, and the phononic crystal model device can provide an effective solution for the phononic crystal in engineering application research.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model provides a control low frequency noise's phononic crystal automobile cavity model device.
The technical scheme is as follows: a photonic crystal cavity device for controlling low-frequency noise comprises a cavity body and a plurality of photonic crystal units arranged on the outer surface of the cavity body in a matrix form,
selecting two points, namely an excitation input point and an excitation output point, on the outer surface of the cavity body around the plurality of photonic crystal units arranged in a matrix form, wherein the excitation input point and the excitation output point are collinear;
the phononic crystal unit comprises a cylindrical scattering body positioned on the upper part and a cylindrical soft coating material layer positioned on the lower part and made of soft coating materials, the scattering body and the soft coating material layer are coaxial and are connected in a sticking mode, and the phononic crystal unit is stuck on the outer surface of the cavity body through the soft coating material layer on the lower part.
The utility model discloses technical scheme selects for use the steel sheet material preparation vapour car carriage of corresponding thickness to simplify model box in kind according to the characteristics of vapour car carriage plate. And preparing a phononic crystal unit group on the cavity of the steel plate, wherein a cavity model device is manufactured, and after drying for 24 hours, a frequency response test and a noise test are carried out in a semi-anechoic chamber for researching the vibration characteristic and the noise reduction characteristic of the phononic crystal model of the cavity of the automobile by a finite element method and a test method.
Furthermore, the cavity body adopts a sealed box body cavity made of a steel plate, and the thickness of the steel plate is 0.6mm-1.0 mm.
Furthermore, the cavity body is a rectangular box cavity formed by steel plates with the thickness of 0.9mm, and the external length multiplied by the width multiplied by the height is 1000mm multiplied by 800mm multiplied by 500 mm.
Further, 15 rows and X5 columns of phononic crystal units are arranged on the upper surface of the rectangular parallelepiped box cavity to the left toward the right, wherein the 15 rows and X5 columns of phononic crystal units are 150mm from the left side boundary of the cavity body.
Further, the excitation input points are disposed at boundary positions on the left side of the cavity body, the output points are disposed collinearly on the right side of the cavity body, and the output points are disposed near 15 rows of the phononic crystal units in column X5.
Further, the distance between the centers of every two adjacent phononic crystal units is 50 mm.
Furthermore, the scatterer is a round steel column body, and the height of the scatterer is 4 mm; the soft coating material is silicone adhesive, and the height of the soft coating material layer is 5 mm. The cavity body is made of a steel plate with lower density and elastic modulus; the coating layer material of the soft coating material layer is soft elastic material silicone adhesive with lower elastic modulus; the scatterer adopts heavy metal material round steel cylinder with large density.
Furthermore, the soft coating material layer and the scattering body as well as the soft coating material layer and the outer surface of the cavity body are connected by adopting liquid silicone structural adhesive in a sticking way.
Compared with the prior art, the utility model, its beneficial effect is:
the utility model discloses a control low frequency noise's phononic crystal cavity device through preparation phononic crystal cavity simulation automobile carriage, and preparation simple process provides effectual solution thinking for the application research of phononic crystal in car damping is fallen and is fallen noise.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a phononic crystal unit structure;
FIG. 3 is a schematic top view of a photonic crystal unit;
fig. 4 is a transfer characteristic curve.
Detailed Description
The technical solution of the present invention is explained in detail below, but the scope of protection of the present invention is not limited to the embodiments.
In order to make the disclosure of the present invention more comprehensible, the following description is further made in conjunction with the accompanying fig. 1 to 4 and the embodiments.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1:
as shown in fig. 1 and 2, a photonic crystal cavity apparatus for controlling low-frequency noise includes a cavity body 1 and a plurality of photonic crystal units 2 arranged in a matrix on an outer surface of the cavity body 1, wherein two points, namely an excitation input point 6 and an output point 7, are selected on the outer surface of the cavity body 1 around the plurality of photonic crystal units 2 arranged in the matrix, and the excitation input point 6 and the output point 7 are collinear. The photonic crystal unit 2 comprises a cylindrical scattering body 3 positioned on the upper part and a cylindrical soft coating material layer 4 positioned on the lower part and made of soft coating materials, the scattering body 3 is coaxial with the soft coating material layer 4, the scattering body 3 and the soft coating material layer 4 are connected in a sticking mode, and the photonic crystal unit 2 is stuck on the outer surface of the cavity body 1 through the soft coating material layer 4 on the lower part.
As shown in fig. 1, the cavity body 1 is a rectangular parallelepiped box cavity made of a steel plate having a thickness of 0.9mm, and the external length × width × height dimensions thereof are 1000mm × 800mm × 500 mm. On the upper surface 5 of the rectangular parallelepiped box cavity, 15 rows and X5 columns of phononic crystal units 2 are arranged from left to right, wherein the 15 rows and X5 columns of phononic crystal units 2 are located 150mm from the left side boundary of the cavity body 1. The distance between the centers of every two adjacent phononic crystal units 2 is 50 mm. The excitation input point 6 is arranged at the boundary position on the left side of the cavity body 1, the output points 7 are arranged on the right side of the cavity body 1 in a collinear manner, and the output points 7 are arranged close to the 15 rows of the phononic crystal units 2 in the column X5.
As shown in fig. 2, the diameter of the phononic crystal unit 2 is 50mm, and the scatterer 3 is a cylindrical steel column with a height of 4 mm; the soft coating material is silicone adhesive, and the height of the soft coating material layer 4 is 5 mm. The cavity body is made of a steel plate with lower density and elastic modulus; the coating layer material of the soft coating material layer is soft elastic material silicone adhesive with lower elastic modulus; the scatterer adopts heavy metal material round steel cylinder with large density.
As shown in fig. 2, the soft coating material layer 4 and the scattering body 3, and the soft coating material layer 4 and the outer surface of the cavity body 1 are bonded and connected by liquid silicone structural adhesive, and are left to stand for 24 hours to manufacture the sample of the embodiment.
According to the characteristics of the automobile compartment plate, the simplified model real object box body of the automobile compartment is made of steel plate materials with corresponding thicknesses. And preparing a phononic crystal unit group on the cavity of the steel plate, wherein a cavity model device is manufactured, and after drying for 24 hours, a frequency response test and a noise test are carried out in a semi-anechoic chamber for researching the vibration characteristic and the noise reduction characteristic of the phononic crystal model of the cavity of the automobile by a finite element method and a test method.
This embodiment, at the excitation input point 6 input excitation of cavity body upper surface 5, output point 7 is gathered, adopts finite element method to calculate frequency response, and the result is shown as the transmission characteristic curve of fig. 4, and fig. 4's transmission characteristic curve explains, the utility model discloses a structure can be in 233.5 ~ 313.6Hz, 461.5 ~ 562.5Hz frequency range, has very obvious band gap, and the maximum 40dB that reaches of attenuation range is about, can effectual control mechanical equipment's well, low frequency vibration noise.
The utility model discloses the part that does not relate to all is the same with prior art or can adopt prior art to realize.
As mentioned above, although the present invention has been shown and described with reference to certain preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A photonic crystal cavity device for controlling low-frequency noise is characterized by comprising a cavity body (1) and a plurality of photonic crystal units (2) arranged on the outer surface of the cavity body (1) in a matrix form,
selecting two points on the outer surface of the cavity body (1) around the periphery of a plurality of phononic crystal units (2) arranged in a matrix form, wherein the two points are an excitation input point (6) and an output point (7), and the excitation input point (6) and the output point (7) are collinear;
the photonic crystal unit (2) comprises a cylindrical scattering body (3) positioned on the upper part and a cylindrical soft coating material layer (4) positioned on the lower part and made of soft coating materials, the scattering body (3) is coaxial with the soft coating material layer (4), the scattering body and the soft coating material layer are connected in a sticking mode, and the photonic crystal unit (2) is stuck on the outer surface of the cavity body (1) through the soft coating material layer (4) on the lower part.
2. The photonic crystal cavity apparatus for controlling low frequency noise according to claim 1, wherein the cavity body (1) is a sealed box cavity made of a steel plate, and the thickness of the steel plate is 0.6mm-1.0 mm.
3. The photonic crystal cavity apparatus for controlling low frequency noise according to claim 2, wherein the cavity body (1) is a rectangular parallelepiped box cavity made of a steel plate with a thickness of 0.9mm, and the external length x width x height dimensions are 1000mm x 800mm x 500 mm.
4. A photonic crystal cavity apparatus for controlling low frequency noise according to claim 3, wherein 15 rows X5 columns of photonic crystal units (2) are provided on the upper surface of the rectangular parallelepiped box cavity to the left toward the right, wherein the 15 rows X5 columns of photonic crystal units (2) are 150mm from the left side boundary of the cavity body (1).
5. The photonic crystal cavity apparatus for controlling low frequency noise according to claim 4, wherein the excitation input point (6) is disposed at a boundary position on the left side of the cavity body (1), the output points (7) are disposed collinearly on the right side of the cavity body (1), and the output points (7) are disposed near 15 rows of the photonic crystal units (2) of X5 columns.
6. The photonic crystal cavity apparatus for controlling low frequency noise according to claim 1, wherein the distance between the centers of two adjacent photonic crystal units (2) is 50 mm.
7. The photonic crystal cavity apparatus for controlling low frequency noise according to claim 1, wherein the scatterer (3) is a cylinder of steel with a height of 4 mm; the soft coating material is silicone adhesive, and the height of the soft coating material layer (4) is 5 mm.
8. The photonic crystal cavity device for controlling low-frequency noise according to claim 7, wherein the flexible coating material layer (4) and the scattering body (3) and the flexible coating material layer (4) and the outer surface of the cavity body (1) are bonded and connected by liquid silicone structural adhesive.
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| CN202020191266.XU CN211906945U (en) | 2020-02-21 | 2020-02-21 | Phononic crystal cavity device for controlling low-frequency noise |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113096628A (en) * | 2021-03-31 | 2021-07-09 | 温州大学 | Triangular lattice local resonance type phononic crystal structure |
| CN113314088A (en) * | 2021-05-18 | 2021-08-27 | 北京航空航天大学 | Heterogeneous/special-shaped acoustic black hole and phonon crystal mixed vibration and noise reduction enhancement structure |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113096628A (en) * | 2021-03-31 | 2021-07-09 | 温州大学 | Triangular lattice local resonance type phononic crystal structure |
| CN113096628B (en) * | 2021-03-31 | 2022-06-24 | 温州大学 | Triangular lattice local resonance type phonon crystal structure |
| CN113314088A (en) * | 2021-05-18 | 2021-08-27 | 北京航空航天大学 | Heterogeneous/special-shaped acoustic black hole and phonon crystal mixed vibration and noise reduction enhancement structure |
| CN113314088B (en) * | 2021-05-18 | 2022-06-28 | 北京航空航天大学 | Heterogeneous/special-shaped acoustic black hole and phononic crystal mixed vibration and noise reduction enhancement structure |
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