CN116180626A - Rail transit sound barrier based on single hollow primitive cell - Google Patents

Abstract

The invention relates to the field of sound barriers, in particular to a rail transit sound barrier based on a single hollow primitive cell. The problem of track traffic noise in the prior art is solved. The sound barrier is installed in track traffic line both sides through H shaped steel stand, installs a plurality of sound insulation boxes between the H shaped steel stand, inside horizontal vertical perpendicular laminating array of sound insulation box respectively has a plurality of single hollow primitive cells. The device adopts a single hollow primitive cell structure, thereby improving the pertinence and effectiveness of sound insulation of the sound barrier and greatly reducing the maintenance cost of the existing sound barrier.

Description

Rail transit sound barrier based on single hollow primitive cell

Technical Field

The invention relates to the field of sound barriers, in particular to a rail transit sound barrier based on a single hollow primitive cell.

Background

The infrastructure of rail transit in China has been rapidly developed. Along with the implementation of the new edition of the method for preventing and controlling noise pollution of the people's republic of China, the prevention and control of the pollution of the rail transit to the acoustic environment along the line also becomes one of the problems of great concern in the later period. The installation of sound barriers on both sides of the line for noise sensitive zones is currently accepted as the primary noise reduction measure. The most widely used sound barrier in the high-speed railway of China is an upright inserting plate type sound barrier, and the sound barrier accounts for more than 90% of the total quantity; and a semi-closed and fully-closed sound barrier with better sound insulation performance is adopted in a part of high-rise sensitive buildings or areas with special requirements.

CN213328724U discloses a wave-shaped highway phonon crystal sound barrier combining Bragg scattering and sound absorption resonance, which adopts open steel upright posts with different heights as scattering sound absorbers, and is internally provided with porous sound absorption media, four rows are arranged in square lattices, and the front surface is in wave-shaped layer-by-layer heightening design. The technical problems and technical disadvantages include:

1. the patent can be only applied to highway traffic, and cannot effectively block different types of noise frequencies generated by rail traffic;

2. after each scatterer of the wavy structure is welded with the bottom plate, the scatterer is fixed on the ground by using foundation bolts, and compared with a high-speed train, the stability of the scatterer is poor.

3. The rock wool sound absorption medium in the design scheme is directly exposed in the external environment, and has serious problems such as collapse, aging and the like due to the influence of the external environment for a long time, so that the service life and the acoustic life of the sound barrier are directly influenced, and the problems such as maintenance cost and the like in the future are also caused.

4. The rock wool sound absorption medium in the design scheme is directly exposed in the external environment, and has serious problems such as collapse, aging and the like due to the influence of the external environment for a long time, so that the service life and the acoustic life of the sound barrier are directly influenced, and the problems such as maintenance cost and the like in the future are also caused.

Disclosure of Invention

The invention provides a single-hollow-cell-based rail transit sound barrier, which effectively solves the problem of rail transit noise in the background technology.

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:

track traffic sound barrier based on single hollow primitive cell, sound barrier pass through H shaped steel stand 1 and install in track traffic line both sides, install a plurality of sound insulation boxes 2, its characterized in that between the H shaped steel stand 1: the inside of the sound insulation box 2 is respectively vertically and horizontally attached with a plurality of single hollow primitive cells 3.

The sound insulation box 2 at the central position of the H-shaped steel upright column 1 is replaced by a transparent sound insulation plate 5 installed through a fixed frame 4, and two ends of the sound insulation plate 5 are connected with the sound insulation box 2.

The Shan Kongxin primitive cells 3 are fixed at the inner bottom of the sound insulation box 2.

The Shan Kongxin primitive cells 3 are round cylinders prefabricated by steel or polycarbonate.

The outer radius of the Shan Kongxin primitive cell 3 is 4.0 cm-5.75 cm

The outer radius of the Shan Kongxin primitive cell 3 is 5.7cm.

The Shan Kongxin primitive cells 3 are perpendicular to the number of track traffic arrays along the number of track traffic arrays=3n to 7n.

The Shan Kongxin primitive 3 is perpendicular to the number of rail transit arrays along the number of rail transit arrays=5n.

The beneficial effects of the invention are as follows: 1. the single hollow primitive cells are adopted for being horizontally and vertically attached to the array period, so that sound waves of different frequency bands can be remarkably restrained; the phonon crystal structure of five-period single hollow steel pipe arrangement can effectively block noise of railways in frequency bands of 62-135Hz, 888-1902Hz and 1904-2360Hz.

2. The phonon crystal type acoustic panel does not change the appearance of the original railway sound barrier, only increases the thickness of the acoustic panel for improving the sound insulation performance, and does not influence the overall design of railway construction.

3. The single hollow primitive cell that this application adopted adopts prefabricated mode with single hollow primitive cell welding at the sound insulation incasement, can strengthen the stability of sound barrier. Meanwhile, the traditional sound-absorbing rock wool is changed into a single hollow primitive cell, so that the maintenance and control maintenance cost in the later period can be reduced to a great extent.

Drawings

FIG. 1 is a schematic installation view of embodiment 1 of the present invention;

FIG. 2 is a schematic view of a sound box according to the present invention;

FIG. 3 is a schematic diagram of a single hollow cell structure according to the present invention;

FIG. 4 is a graph showing the transfer characteristic of a single hollow cell energy band diagram

FIG. 5 is a graph of the effect of single hollow cell radius on band gap;

FIG. 6 is a graph showing a single hollow cell transmission characteristic;

FIG. 7 is a single hollow cell transmission loss sound pressure level cloud;

FIG. 8 is a cloud of acoustic transmission losses for a single hollow cell at different frequencies;

FIG. 9 is a schematic installation view of embodiment 2 of the present invention;

the figure shows: h-shaped steel stand 1, sound insulation case 2, single hollow primitive cell 3, fixed frame 4, penetrating acoustic celotex board 5.

Detailed Description

The technical scheme of the invention is further described below by specific embodiments with reference to the accompanying drawings:

example 1

The utility model provides a track traffic sound barrier based on single hollow primitive cell as shown in fig. 1-8, the sound barrier passes through H shaped steel stand 1 and installs in track traffic line both sides, installs a plurality of sound insulation boxes 2 between the H shaped steel stand 1, and the main characteristics of this application are: the traditional sound-absorbing rock wool is replaced by a plurality of single hollow primitive cells 3.

The noise sources of the high-speed train mainly comprise wheel track noise, pneumatic noise, current collecting noise and the like. The existing research results indicate that wheel track noise is always dominant, the sound radiation of the 300-2500Hz steel rail is the most important, and at higher frequencies, the wheel set becomes the most important radiation source. The contribution frequency band of traction system noise to bogie region noise is mainly a medium-high frequency band and takes the dominant role. Therefore, if train passing noise is to be further controlled, wheel rail noise must be controlled. When the ordinary high-speed train in China runs at 270-340km/h, the noise peak frequency band outside the train is mainly concentrated at 1600-2000Hz, and the test result shows that the noise component of wheel track noise in the frequency band of 630-4500Hz always takes the dominant role. The application mainly solves the problem that the wheel track noise is in the 630-4500Hz frequency band.

The single hollow primitive cell 3 adopted by the device adopts a circular cylinder structure.

The single hollow primordia 3 was analyzed as follows:

TABLE 1 hollow cell 3 Material Properties

The lattice constant a of the single hollow primitive cell 3 is selected to be 12cm, the outer diameter R is 5.7cm, the wall thickness t is 0.5cm, as shown in figure 4, which is a comparison graph of the energy band diagram transmission characteristic curve of the single hollow primitive cell 3, three complete band gaps exist in the structure of the Shan Kongxin primitive cell 3, the structure is well matched with the attenuation domain of the transmission loss, and the structure is shown as dark gray rectangles in the figure, namely 62-135Hz, 888-1902Hz and 1904-2360Hz respectively. It can be seen that the elastic wave is effectively suppressed when propagating in the above frequency band, and the acoustic wave cannot propagate in any direction in the structure, wherein the bandwidth of the second complete band gap is the widest, and the frequency span is 1014Hz. The complete band gap is generated mainly because the periodically changing structure and the elastic wave are mutually coupled and are reversely overlapped with the reflected wave of the scattering body, so that the interference effect of the acoustic wave is formed to cause the cancellation of the acoustic wave.

The generation of the complete band gap is based on the Bragg scattering principle, and each key parameter of the scatterer has a critical influence on the formation of the complete band gap, so the application researches the influence of the radius of the single hollow primitive cell 3 on the formation of the band gap. As shown in fig. 5, which is a graph of the effect of the radius of the single hollow cell 3 on the band gap, it is clear from fig. 5 that the radius of the single hollow cell 3 is less than 3.7cm, and the single hollow cell 3 comprises the ratio of the occupied area of the internal hollow in the whole unit cell, that is, the filling rate is less than 30%, the complete band gap will not be formed; the second full band gap achieves the desired bandwidth as the radius of Shan Kongxin cell 3 increases to 4.7cm, i.e., the filling rate is greater than 50%. For example, when the diffuser radius increases from 4cm to 5.75cm, the corresponding start frequency decreases from 1655Hz to 941Hz and the cut-off frequency increases from 1737Hz to 2295Hz, thus indicating that the band gap width increases with increasing filling rate, which has an important effect on the band gap width of the single hollow cell 3. Therefore, the radius of the single hollow cell 3 is selected to be 5.7cm based on the lattice constant, while maintaining an appropriate void and achieving a maximum filling rate.

Meanwhile, the arrangement period of the single hollow primary cells 3 has a serious influence on the sound insulation performance, and as shown in fig. 6, the single hollow primary cells 3 have good noise reduction effect in the band gap range and are basically matched with the band gap range of the single hollow primary cells 3. As is clear from fig. 6, the sound insulation performance of the single hollow cell 3 is improved with an increase in the number of arrangement cycles, because the number of cycles of the single hollow cell 3 plays an important role in suppressing the elastic wave as a periodic structure. Therefore, the actual installation condition and the like can be considered in the actual engineering application in the sound barrier field, and the period arrangement number can be increased as much as possible.

In general, the more the number of phonon crystal cycles is, the more the phonon crystal cycles can be approximately considered to be close to an ideal model (infinite cycle), and the sound insulation effect can be improved. In order to further analyze the propagation rule of the sound wave in the single hollow primitive cell 3, fig. 7 shows sound transmission loss sound pressure cloud diagrams of four-period and five-period single hollow tube phonon crystals at 1451Hz, and fig. 7 shows that the sound wave is difficult to effectively propagate in the complete band gap frequency band of the phonon crystal structure, and the five-period arrangement mode is superior to the single hollow primitive cell 3 structure of four-period arrangement in terms of sound transmission loss. The main attenuation domain of the single hollow primitive cell 3 is 600-2400Hz, the peak area of wheel track noise during the running of a high-speed train can be well covered, and the single hollow primitive cell 3 has the advantages of easy production, convenient construction, ideal attenuation domain and the like, and is applicable to most road sections with simple working conditions, small and stable noise source change in the sound barrier field.

The practical effect is shown in fig. 8, and fig. 8 is a cloud chart of acoustic transmission loss at different frequencies. From the figure, the sound wave is obviously inhibited when the sound wave propagates in the complete band gap.

Example 2

As shown in fig. 9, a single hollow primitive cell-based sound barrier for rail transit is installed at both sides of a rail transit line through H-shaped steel columns 1, and comprises: through penetrating acoustic celotex board 5 of fixed frame 4 installation, install sound insulation box 2 at H shaped steel stand 1 at fixed frame 4 both ends, inside horizontal vertically laminating array respectively has a plurality of single hollow primitive cells 3 of sound insulation box 2.

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 characteristics 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 disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (8)

1. Track traffic sound barrier based on single hollow primitive cell, sound barrier pass through H shaped steel stand and install in track traffic line both sides, install a plurality of sound insulation boxes, its characterized in that between the H shaped steel stand: the sound insulation box is internally provided with a plurality of single hollow primordium cells in a horizontally and longitudinally vertical laminating array respectively.

2. A single hollow cell based sound barrier for rail transit as claimed in claim 1, wherein: the sound insulation box of H shaped steel stand central point puts is replaced for penetrating acoustic celotex board through fixed frame installation, and the sound insulation box is connected at penetrating acoustic celotex board both ends.

3. A single hollow cell based sound barrier for rail transit as claimed in claim 1, wherein: the Shan Kongxin primitive is fixed on the inner bottom of the sound insulation box.

4. A single hollow cell based sound barrier for rail transit according to claim 3, wherein: the Shan Kongxin primitive cells are round cylinders prefabricated by steel or polycarbonate.

5. The single hollow cell based sound barrier for rail transit of claim 4, wherein: the extracellular radius of Shan Kongxin is 4.0 cm-5.75 cm.

6. The single hollow cell based sound barrier for rail transit of claim 5, wherein: the Shan Kongxin primary extracellular radius is 5.7cm.

7. A single hollow cell based sound barrier for rail transit as claimed in claim 1, wherein: the Shan Kongxin primitive cells are perpendicular to the number of track traffic arrays along the number of track traffic arrays=3n-7n.

8. The single hollow cell based sound barrier for rail transit of claim 7, wherein: the Shan Kongxin primitive cell is perpendicular to the number of rail transit arrays along the number of rail transit arrays = 5N.

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