CN115787535A - Rail transit sound barrier based on four-compound primitive cells embedded in openings - Google Patents
Rail transit sound barrier based on four-compound primitive cells embedded in openings Download PDFInfo
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- CN115787535A CN115787535A CN202211470591.XA CN202211470591A CN115787535A CN 115787535 A CN115787535 A CN 115787535A CN 202211470591 A CN202211470591 A CN 202211470591A CN 115787535 A CN115787535 A CN 115787535A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to the field of sound barriers, in particular to a track traffic sound barrier based on four composite primitive cells embedded in an opening. The problem of noise control singleness in the prior art is solved. The sound barrier passes through H shaped steel column mouting in track traffic route both sides, installs a plurality of sound insulation boxes, its characterized in that between the H shaped steel stand: a plurality of opening embedded four-compound type primitive cells are vertically arrayed in the sound insulation box in the transverse and longitudinal directions respectively, the opening embedded four-compound type primitive cells comprise four groups of single hollow primitive cells and a hollow opening pipe, and the four groups of single hollow primitive cells are sequentially connected and then are arranged in the hollow opening pipe. The device adopts the sound barrier of the embedded four compound primitive cell structural design of opening, can form many complete band gap characteristics, solves the problem of sound barrier sound insulation unicity when promoting sound barrier sound insulation performance, can control to the multiple sound source that track traffic formed to have obvious environmental suitability, very big reduction maintenance cost.
Description
Technical Field
The invention relates to the field of sound barriers, in particular to a track traffic sound barrier based on four composite primitive cells embedded in an opening.
Background
The rail transit is the most important transportation mode in China and plays an important role in the development strategy of the strong traffic countries. However, with the continuous improvement of the operation speed of various trains, the problem of noise caused by rail transit is more and more obvious; and with the implementation of the new edition of the noise pollution prevention and control law of the people's republic of China, higher requirements are also put forward on the noise pollution prevention and control of the rail transit. Therefore, the noise problem of the rail transit will become a key problem limiting the rapid development of the rail transit. In the field of rail transit noise control, the main adopted mode is to install sound barriers on two sides of a line, so that the acoustic performance and the service performance of the sound barriers need to be further improved.
The rail train not only can cause serious noise pollution when in operation, but also can form a plurality of noise sources, and the sound radiation can cover the whole frequency band, so that the traditional sound barrier can not well meet the noise control of rail transit in the aspect of sound insulation performance, and has the problem of noise control singleness, and particularly under the condition that a plurality of sound sources exist, the noise of the plurality of sound sources is difficult to control.
Disclosure of Invention
The invention provides a track traffic sound barrier based on four-composite primitive cells embedded in openings, which effectively solves the problem of noise control singleness in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a track traffic sound barrier based on embedded four compound primitive cells of opening, sound barrier pass through H shaped steel stand 1 to install in track traffic route both sides, install a plurality of sound-proof box 2, its characterized in that between H shaped steel stand 1: a plurality of opening embedded four-compound type primitive cells 3 are vertically arrayed in the sound insulation box 2 in the transverse and longitudinal directions respectively, each opening embedded four-compound type primitive cell 3 comprises four groups of single hollow primitive cells 4 and a hollow opening pipe 5, and the four groups of single hollow primitive cells 5 are sequentially connected and then are arranged in the hollow opening pipes 5.
The sound-proof box 2 replacement of H shaped steel stand 1 position placed in the middle is through penetrating acoustic celotex board 5 through the installation of fixed frame 4, and sound-proof box 2 is connected at 5 both ends of acoustic celotex board.
The single hollow primitive cell 4 with the four composite primitive cells 3 embedded in the opening is fixed at the inner bottom of the sound insulation box 2.
The single hollow primitive cell 4 and the hollow opening pipe 5 of the opening embedded with the four-compound primitive cell 3 are both round cylinders prefabricated by steel or polycarbonate.
The outer radius of the single hollow primitive cell 4 with the four-compound primitive cell 3 embedded in the opening is 1.6 cm-2.0 cm.
The outer radius of the single hollow primitive cell 4 with the four-compound primitive cell 3 embedded in the opening is 1.9cm.
The opening angle of the hollow opening pipe 5 with the four-compound primitive cell 3 embedded in the opening is 30-60 degrees.
The opening angle of the hollow opening pipe 5 with the four-compound type primitive cells 3 embedded in the opening is 30 degrees.
The single hollow primitive cells 4 with the four composite primitive cells 3 embedded in the openings are perpendicular to the number of the track traffic arrays and the number of the track traffic arrays = 3N-7N.
The single hollow primitive cells 4 with the four composite primitive cells 3 embedded in the openings are perpendicular to the number of the track traffic arrays and the number of the track traffic arrays =5N.
The invention has the beneficial effects that: the sound insulation device with good acoustic service life and service life is provided for the rail transit industry, and the green sustainable long-term development strategy of rail transit is supported.
1. The structure of the four-compound primitive cells embedded in the opening utilizes two single hollow primitive cells with different radiuses, adopts the design of external opening and internal arrangement combination, can enhance the Bragg reflection of sound waves between the cavity and the scattering body, and the transmission of the sound waves is more complex due to the interference effect of the sound waves for many times, so that complete band gaps of multiple frequency bands can be formed.
2. The opening is embedded with four composite primitive cells to form a plurality of sound insulation complete band gaps, noise of railways at 457-622Hz, 1025-1119Hz, 1123-1318Hz, 1463-1886Hz, 2010-2360Hz, 2949-3184Hz and 3937-4410Hz can be effectively blocked under the background of various complex sound sources of rail transit, and sound waves of different frequency bands can be remarkably suppressed.
3. The sound insulation box with the four-compound primitive cells embedded in the opening does not change the appearance of the original sound barrier for the railway, only increases the thickness in order to improve the sound insulation performance, and does not influence the overall design of railway construction.
4. The structure of the opening embedded four-compound type primitive cell adopts two single hollow primitive cells with different radiuses, the outside adopts the opening and the inside arrangement combination design, resonance can be formed in the inner space of the opening to dissipate sound energy, and therefore the sound insulation performance is improved.
5. The structure of the four-compound primitive cell embedded in the opening adopts a nested structure design, so that the overall stability can be increased, and the four-compound primitive cell structure also has better advantages in the aspect of later maintenance.
Drawings
FIG. 1 is an installation diagram of embodiment 1 of the present invention;
FIG. 2 is a schematic view of the sound isolation box of the present invention;
FIG. 3 is a schematic view of a four-compound type primitive cell embedded in an opening according to the present invention;
FIG. 4 is a schematic diagram of a single opening embedded with four composite type primitive cells;
FIG. 5 is a comparison of transmission characteristic curves of energy band diagrams of four composite primitive cells embedded in openings;
FIG. 6 is the influence of the opening angle of the hollow open pipe and the radius of a single hollow primitive cell on the band gap;
FIG. 7 is a graph showing the transmission characteristics of four composite primitive cells embedded in an opening;
FIG. 8 is a cloud of transmission loss at different frequencies of a four-composite type primitive cell sound barrier embedded in an opening;
FIG. 9 is an installation diagram of embodiment 2 of the present invention;
shown in the figure: the sound insulation structure comprises an H-shaped steel upright 1, a sound insulation box 2, four composite cells 3 embedded in an opening, a single hollow cell 4, a hollow open pipe 5, a fixed frame 6 and a transparent sound insulation plate 7.
Detailed Description
The technical scheme of the invention is further explained by specific embodiments in the following with the accompanying drawings:
example 1
As shown in figures 1-8, a track traffic sound barrier based on embedded four compound primitive cells of opening, sound barrier pass through H shaped steel stand 1 and install in track traffic route both sides, install a plurality of sound-proof box 2 between the H shaped steel stand 1, the key feature of this application is: the traditional sound-absorbing rock wool is embedded with four composite primitive cells 3 in a plurality of openings. The opening embedded four-compound type primitive cell 3 comprises four groups of single hollow primitive cells 4 and a hollow opening pipe 5, wherein the four groups of single hollow primitive cells 5 are sequentially connected and then are arranged in the hollow opening pipe 5.
The four-compound primitive cell 3 embedded in the opening is in a form that four single hollow primitive cells 4 are arranged in a hollow opening pipe 5, the opening angle of the hollow opening steel pipe is 30 degrees and faces to a background pressure field, and the radius and the wall thickness of the inner hollow steel pipe are respectively 1.9cm and 0.2cm. As shown in FIG. 5, the structure has seven complete band gaps which are respectively present at 457-622Hz, 1025-1119Hz, 1123-1318Hz, 1463-1886Hz, 2010-2360Hz, 2949-3184Hz and 3937-4410Hz, and the bandwidths of which are respectively 165Hz,94Hz, 195Hz,315Hz,423Hz,350Hz and 473Hz. The sound wave enters the interior from the opening of the hollow open pipe 5 with the four-compound type primitive cell 3 embedded in the opening, and resonates with the air at the opening and the internal space, so that part of the sound energy is converted into heat energy, and the sound energy is consumed. And then four single hollow primitive cells 4 which are connected in sequence are embedded in the cavity, thereby intensifying Bragg reflection of sound waves between the cavity and the scatterer, further enhancing the frequency of interference effect, leading the transmission of the sound waves to be more complex and leading a plurality of complete band gaps with narrower frequency bands to appear.
The opening angle of the hollow open pipe 5 is 30 degrees, the radius of the open steel pipe is 5.5cm, the direction of the open steel pipe faces a background pressure field, the radius and the wall thickness of the single hollow primitive cell 4 are 1.9cm and 0.2cm respectively, the influence on the band gap is shown in figure 6, and the opening angle of the hollow open pipe 5 and the radius of the single hollow primitive cell 4 influence the fourth band gap, the sixth band gap and the seventh band gap of the phononic crystal structure respectively.
The increasing opening angle of the hollow open pipe 5 tends to reduce the bandwidth, and the complete band gap has the phenomenon of shifting to higher frequency as a whole. The radius of the single hollow primitive cell 4 has larger influence on different band gaps, the starting frequency of the sixth band gap shifts upwards along with the increase of the radius, the cut-off frequency of the seventh band gap shifts downwards, and both bandwidths tend to decrease.
As can be seen from the acoustic transmission loss spectrum curve of the opening embedded four-compound type primitive cell 3 shown in FIG. 7, the design has good inhibition effect on the acoustic wave in a lower frequency band (less than 2500 Hz). Because the structure can form a Helmholtz resonance sound absorption cavity, the air mass of the oscillator is increased during resonance, and the structure can form a low-frequency band gap; at 2500-3500Hz, the structure has not ideal inhibiting effect on the sound wave, because only M Gamma direction band gap exists at the moment, but the propagation of the sound wave is only generated at one side of the exciting source, and the sound transmission loss performance at the Gamma direction band gap is better than that of the M Gamma direction band gap, so that the sound wave can completely pass through the phononic crystal structure. Furthermore, due to the presence of the openings, the periodic suppression of the unit cell is reduced when the acoustic wave propagates in the direction of M r.
According to the transmission loss expression:
in the formula: p in Is incident wave sound pressure, P out Is a transmitted wave acoustic pressure.
Therefore, the following steps are carried out: the number of the rail traffic arrays perpendicular to the number of the rail traffic arrays is optimally selected to be 5 columns, and then complete sound insulation can be achieved.
As can be seen from fig. 8, with the sound barrier having the four-composite cell structure embedded in the opening, sound waves are significantly suppressed when propagating in the complete band gap, and sound waves are difficult to propagate effectively, thereby achieving sound insulation.
Example 2
As shown in fig. 9, the track traffic sound barrier based on the four composite primitive cells embedded in the opening is installed on two sides of the track traffic line through the H-shaped steel upright post 1, and the sound barrier comprises: through the penetrating acoustic celotex board 5 of fixed frame 4 installation, install sound-proof box 2 at the H shaped steel stand 1 at fixed frame 4 both ends, sound-proof box 2 is inside transversely vertically respectively the vertical array have the embedded four compound primitive cells 3 of a plurality of openings.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a track traffic sound barrier based on embedded four compound primitive cells of opening, sound barrier pass through H shaped steel column mouting in track traffic route both sides, install a plurality of sound-proof box, its characterized in that between the H shaped steel column: a plurality of opening embedded four-compound type primitive cells are vertically arrayed in the sound insulation box in the transverse and longitudinal directions respectively, the opening embedded four-compound type primitive cells comprise four groups of single hollow primitive cells and a hollow opening pipe, and the four groups of single hollow primitive cells are sequentially connected and then are arranged in the hollow opening pipe.
2. The rail transit sound barrier based on the opening embedded four-compound type primitive cell as claimed in claim 1, wherein: the sound-proof box replacement that H shaped steel found 1 position placed in the middle is through the penetrating acoustic celotex board of fixed frame installation, and the sound-proof box is connected at the acoustic celotex board both ends.
3. The rail transit sound barrier based on the opening embedded four-compound type primitive cell as claimed in claim 1, wherein: the single hollow primitive cell with the four composite primitive cells embedded in the opening is fixed at the inner bottom of the sound insulation box.
4. The rail transit sound barrier based on the opening embedded four-compound type primitive cell as claimed in claim 3, wherein: the single hollow primitive cell and the hollow opening pipe of the opening embedded with the four-compound primitive cell are both round cylinders prefabricated by steel or polycarbonate.
5. The rail transit sound barrier based on the opening embedded four-compound type primitive cell as claimed in claim 1, wherein: the outer radius of the single hollow protocell with the four-compound protocell embedded in the opening is 1.6 cm-2.0 cm.
6. The rail transit sound barrier based on the opening embedded four-compound type primitive cell as claimed in claim 5, wherein: the outer radius of the single hollow primitive cell with the four composite primitive cells embedded in the opening is 1.9cm.
7. The rail transit sound barrier based on the opening embedded four-compound type primitive cell as claimed in claim 1, wherein: the opening angle of the hollow opening pipe with the four-compound primitive cells embedded in the opening is 30-60 degrees.
8. The rail transit sound barrier based on the opening embedded four-compound type primitive cell as claimed in claim 7, wherein: the opening angle of the hollow opening pipe with the four-compound primitive cells embedded in the opening is 30 degrees.
9. The rail transit sound barrier based on the opening embedded four-compound type primitive cell as claimed in claim 1, wherein: the single hollow primitive cells embedded with the four composite primitive cells in the opening are perpendicular to the number of the rail traffic arrays and the number of the rail traffic arrays = 3N-7N.
10. The rail transit sound barrier based on the opening embedded four-compound type primitive cell as claimed in claim 9, wherein: the single hollow primitive cells embedded with the four composite primitive cells in the opening are perpendicular to the number of the rail traffic arrays and the number of the rail traffic arrays =5N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211470591.XA CN115787535A (en) | 2022-11-23 | 2022-11-23 | Rail transit sound barrier based on four-compound primitive cells embedded in openings |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211470591.XA CN115787535A (en) | 2022-11-23 | 2022-11-23 | Rail transit sound barrier based on four-compound primitive cells embedded in openings |
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| CN115787535A true CN115787535A (en) | 2023-03-14 |
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| CN202211470591.XA Pending CN115787535A (en) | 2022-11-23 | 2022-11-23 | Rail transit sound barrier based on four-compound primitive cells embedded in openings |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797541A (en) * | 2004-12-21 | 2006-07-05 | 广东工业大学 | Acoustic construction of 2D phonon crystal |
| CN107245963A (en) * | 2017-08-10 | 2017-10-13 | 湖南大学 | A kind of sound barrier that phonon crystal is scattered based on Bragg |
| CN111270621A (en) * | 2019-12-04 | 2020-06-12 | 华东交通大学 | Novel two-dimensional phononic crystal sound barrier structure |
| CN216515208U (en) * | 2021-10-20 | 2022-05-13 | 北京交通大学 | Noise reduction device is strengthened on sound barrier top that combines Bragg scattering and cavity resonance |
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2022
- 2022-11-23 CN CN202211470591.XA patent/CN115787535A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797541A (en) * | 2004-12-21 | 2006-07-05 | 广东工业大学 | Acoustic construction of 2D phonon crystal |
| CN107245963A (en) * | 2017-08-10 | 2017-10-13 | 湖南大学 | A kind of sound barrier that phonon crystal is scattered based on Bragg |
| CN111270621A (en) * | 2019-12-04 | 2020-06-12 | 华东交通大学 | Novel two-dimensional phononic crystal sound barrier structure |
| CN216515208U (en) * | 2021-10-20 | 2022-05-13 | 北京交通大学 | Noise reduction device is strengthened on sound barrier top that combines Bragg scattering and cavity resonance |
Non-Patent Citations (1)
| Title |
|---|
| 秦晓春等: "声子晶体型高速公路声屏障的降噪性能", 中国环境科学 * |
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