CN112227237A - Sound barrier containing air resonant cavity - Google Patents
Sound barrier containing air resonant cavity Download PDFInfo
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- CN112227237A CN112227237A CN202011249885.0A CN202011249885A CN112227237A CN 112227237 A CN112227237 A CN 112227237A CN 202011249885 A CN202011249885 A CN 202011249885A CN 112227237 A CN112227237 A CN 112227237A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0017—Plate-like elements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0047—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with open cavities, e.g. for covering sunken roads
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
- E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
- E01F8/0047—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with open cavities, e.g. for covering sunken roads
- E01F8/0064—Perforated plate or mesh, e.g. as wall facing
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The invention provides a sound barrier containing an air resonant cavity, and relates to the field of road noise reduction. The sound barrier containing the air resonance cavity comprises a first panel and a second panel which are arranged in parallel at intervals, a Helmholtz resonator is arranged between the first panel and the second panel, the Helmholtz resonator is of a hollow pipe body structure, the Helmholtz resonance cavity is arranged inside the Helmholtz resonator, and a plurality of through holes are formed in the Helmholtz resonator; still be equipped with first sound absorption column structure between first panel and the second panel, first sound absorption column structure includes first sound absorption body and inhales the sound filler, has seted up a plurality of perforation on the first sound absorption body. When external noise enters the Helmholtz resonant cavity through the through holes, the air column in the Helmholtz resonant cavity generates resonance motion, the resonance motion of the air column plays a role in counteracting the sound wave of the noise, and the dynamic vibration absorber is equivalent to a spring-additional mass system on the dynamic vibration absorber, so that the noise sound wave on specific frequency is effectively eliminated.
Description
Technical Field
The invention relates to the technical field of road noise reduction, in particular to a sound barrier containing an air resonant cavity.
Background
With the rapid development of highways, urban expressways and rail transit, the noise pollution problem is caused while convenience is provided for people to go out. Among them, the sound barrier is a main means for solving road traffic noise, and the sound barrier generally absorbs noise using a sound absorbing material or blocks the transmission of sound using a sound insulating material.
The sound barrier is also called as a sound insulation wall, for example, the chinese patent application with application publication No. CN108005270A and application publication No. 2018.05.08 discloses a wall with sound insulation function, and specifically disclose this wall body including U type fossil fragments, the inner chamber of U type fossil fragments is provided with inhales the sound cotton, it becomes sinusoidal type to inhale the sound cotton, it all is provided with D type fossil fragments to inhale the crest trough department of sound cotton, the U type fossil fragments top, the left and right portion of bottom all installs interior gypsum board, the outer wall of four groups interior gypsum boards all is provided with outer gypsum board, interior gypsum board, self tapping screw is all installed to the outer wall of outer gypsum board, interior gypsum board, the outer wall of outer gypsum board all is connected with U type fossil fragments and D type fossil fragments through self tapping screw, it forms the space of a plurality of similar "resonance rooms" with D type fossil fragments to inhale the sound cotton between the gypsum board, the sound wave is absorbed at a plurality of "resonance room" internal reflection, the cooling energy.
In the prior art, the sound insulation wall reflects and absorbs sound waves by utilizing a plurality of resonance chambers formed between sound absorption cotton and gypsum boards and a D-shaped keel to achieve the sound insulation effect. However, the sound-absorbing structure of a single form cannot effectively shield and eliminate noise of a specific frequency, and the sound-deadening effect of the whole sound barrier is poor.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a sound barrier including an air resonance cavity, so as to solve the problem that the existing sound barrier cannot effectively shield and eliminate the noise of a specific frequency, and the sound-deadening effect of the whole sound barrier is poor.
The technical scheme of the sound barrier containing the air resonant cavity is as follows:
the sound barrier containing the air resonance cavity comprises a first panel and a second panel which are arranged in parallel at intervals, a Helmholtz resonator is arranged between the first panel and the second panel, the Helmholtz resonator is internally provided with the Helmholtz resonance cavity, and a plurality of through holes communicated with the Helmholtz resonance cavity are formed in the Helmholtz resonator;
still be equipped with first sound absorption column structure between first panel and the second panel, the inside of first sound absorption column structure is equipped with inhales the sound filler, a plurality of perforation have been seted up on the first sound absorption column structure.
Has the advantages that: a Helmholtz resonator and a first sound absorption column structure are arranged between the first panel and the second panel, an air column is formed in the Helmholtz resonant cavity inside the Helmholtz resonator, when external noise enters the Helmholtz resonant cavity through the through hole, the air column in the Helmholtz resonant cavity performs resonant motion, the resonant motion of the air column plays a role in counteracting sound waves of the noise, and the Helmholtz resonator is equivalent to a spring-additional mass system on a dynamic vibration absorber, so that the noise sound waves on specific frequency are effectively eliminated; moreover, first sound absorption column structure includes first sound absorption body to and set up the inside sound absorption filler of first sound absorption body, the noise still can get into the inside of first sound absorption body through the perforation, and the sound wave that the filler played the buffering and absorbing action to the noise is inhaled in the utilization.
The Helmholtz resonator is adopted to perform resonance sound loss on noise, the first sound absorption column structure is adopted to absorb the noise and consume the sound energy, different noise reduction forms are combined, the noise sound wave with specific frequency can be accurately eliminated, and the noise reduction effect at the resonance frequency is optimal; and the first sound absorbing column structure and the Helmholtz resonator are complemented, so that a wider and stable shielding and silencing effect is realized.
Furthermore, the helmholtz resonator is of a hollow pipe structure, the outer contour of the helmholtz resonator is prismatic, the helmholtz resonator comprises a main body portion and a convex portion, a groove matched with the convex portion is formed in the inner wall of the second panel, an inner cavity of the main body portion is communicated with an inner cavity of the convex portion to form a prismatic inner cavity, and the prismatic inner cavity forms the helmholtz resonant cavity.
Furthermore, the outer contour of the helmholtz resonator is hexagonal prism-shaped, the helmholtz resonator comprises an inner side wall, a first oblique side wall, a second oblique side wall, a first narrow side wall, a second narrow side wall and an outer side wall, the first oblique side wall and the second oblique side wall are respectively connected with the inner side wall to form the main body part, and the cross section of the inner cavity of the main body part is isosceles trapezoid; the first narrow side wall and the second narrow side wall are respectively connected with the outer side wall to form a protruding part, and the cross section of an inner cavity of the protruding part is rectangular.
Furthermore, the first oblique side wall with the contained angle between the inside wall is the acute angle, first oblique side wall, the oblique side wall of second symmetry respectively set up the border position of inside wall.
Further, an included angle between the first inclined side wall and the inner side wall is any angle between 15 degrees and 45 degrees.
Furthermore, the through hole is formed in the first inclined side wall or the second inclined side wall.
Furthermore, the outer contour of the first sound absorbing column structure is a triangular prism shape, the first sound absorbing column structure and the helmholtz resonator are alternately arranged in parallel, and a sound transmission interval is reserved between the first sound absorbing column structure and the helmholtz resonator.
Further, still be equipped with the second body of inhaling sound that is located marginal position between first panel and the second panel, the inside of second body of inhaling sound is equipped with inhale the sound filler, the second body of inhaling sound with the fixed connection of second panel.
Further, the sound barrier including the air resonance cavity further includes an outer frame, the outer frame is respectively and fixedly connected with the first panel and the second panel, and the first panel is uniformly provided with louver holes.
Drawings
FIG. 1 is a schematic cross-sectional view of a sound barrier containing an air resonant cavity according to an embodiment 1 of the sound barrier containing an air resonant cavity of the present invention;
FIG. 2 is an enlarged partial schematic view of the sound barrier of FIG. 1 including an air resonance cavity;
FIG. 3 is a schematic perspective view of a Helmholtz resonator in an embodiment 1 of the sound barrier including an air resonance cavity of the present invention;
FIG. 4 is a schematic front view of a sound barrier containing an air resonance cavity according to an embodiment 1 of the sound barrier containing an air resonance cavity of the present invention;
fig. 5 is a schematic diagram of the resonant cavity in the embodiment 1 of the sound barrier including the air resonant cavity according to the present invention.
In the figure: 1-first panel, 10-louver hole, 2-second panel, 21-groove, 3-Helmholtz resonator, 30-main body part, 300-inner side wall, 301-first oblique side wall, 302-second oblique side wall, 31-convex part, 310-outer side wall, 311-first narrow side wall, 312-second narrow side wall, 32-through hole, 4-first sound absorption column structure, 41-sound absorption interval, 5-second sound absorption tube body, 6-outer frame and 7-transparent sound insulation window.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In embodiment 1 of the sound barrier including an air resonance cavity of the present invention, as shown in fig. 1 to 4, the sound barrier including an air resonance cavity includes a first panel 1 and a second panel 2 arranged in parallel and spaced apart from each other, a helmholtz resonator 3 is disposed between the first panel 1 and the second panel 2, the helmholtz resonator 3 is a hollow tube structure, a plurality of groups of helmholtz resonance cavities are disposed inside the helmholtz resonator 3, and corresponding through holes 32 are opened on the side surfaces of the helmholtz resonator 3; and, still be equipped with first sound absorption column structure 4 between first panel 1 and the second panel 2, first sound absorption column structure 4 includes first sound-absorbing pipe body to and set up the sound filler of inhaling inside the sound-absorbing pipe body, seted up a plurality of perforation on the first sound-absorbing pipe body, so that the sound wave gets into.
A helmholtz resonator 3 and a first sound absorption column structure 4 are arranged between the first panel 1 and the second panel 2, an air column is formed in the helmholtz resonant cavity inside the helmholtz resonator 3, when external noise enters the helmholtz resonant cavity through the through hole 32, the air column in the helmholtz resonant cavity performs resonant motion, the resonant motion of the air column plays a role in counteracting sound waves of the noise, and the helmholtz resonant motion is equivalent to a spring-additional mass system on the dynamic vibration absorber, so that the noise sound waves on specific frequency are effectively eliminated; moreover, first sound absorption column structure 4 includes first sound absorption body to and set up the inside sound absorption filler of first sound absorption body, the noise still can get into the inside of first sound absorption body through the perforation, utilizes the sound absorption filler to play buffering and absorbing effect to the sound wave of noise.
The Helmholtz resonator 3 is adopted to perform resonance sound loss on noise, the first sound absorption column structure 4 is adopted to absorb the noise to consume the sound energy, and different noise reduction forms are combined, so that the noise sound wave with specific frequency can be accurately eliminated, and the resonance noise reduction effect is better; and the first sound absorbing column structure 4 and the Helmholtz resonator 3 are complemented, so that a wider and stable shielding and silencing effect is realized.
It should be noted that the structure of the resonance cavity is shown in fig. 5, where V is the volume of the resonance cavity, d is the diameter of the throat, and t is the length of the throat. The resonant frequency of the resonant cavity is determined by the volume of the cavity, the length and diameter of the throat, and the resonant sound absorption frequency can be estimated by the following formula:
in the above formula, frIs the resonant frequency of the resonant cavity, Hz; c is the sound velocity, 340 m/s; s is the cross-sectional area of the neck and the mouth, and S is pi d2(ii)/4; v is the volume of the resonant cavity, m3(ii) a t is the length of the throat, m; d is the diameter of the hole neck, m. The purpose of broadband sound absorption can be achieved by finely designing the size of the resonant cavity according to an estimation formula, and the different resonant cavity sizes and the sound absorption effects thereof are shown in table 1.
TABLE 1
According to the parameters in the table, 8 Helmholtz resonators 3 with different specifications can absorb sound in a frequency band of 500-800 Hz, and the noise reduction effect can reach more than 12 dB.
In the present embodiment, the outer contour of the helmholtz resonator 3 is prism-shaped, the helmholtz resonator 3 includes a main body 30 and a convex portion 31, the inner wall of the second panel 2 is provided with a groove 20 matching the convex portion 31, the inner cavity of the main body 30 communicates with the inner cavity of the convex portion 31 to form a prism-shaped inner cavity, and the prism-shaped inner cavity forms a helmholtz resonance cavity. Providing the projecting portion 31 on the helmholtz resonator 3, fixedly mounting the projecting portion 31 with the recess 20 of the second panel 2 facilitates reliably fitting the helmholtz resonator 3 between the first panel 1 and the second panel 2.
Specifically, the outer contour of the helmholtz resonator 3 is hexagonal prism-shaped, and the helmholtz resonator 3 includes an inner sidewall 300, a first inclined sidewall 301, a second inclined sidewall 302, a first narrow sidewall 311, a second narrow sidewall 312, and an outer sidewall 310. The first inclined side wall 301 and the second inclined side wall 302 are respectively connected with the inner side wall 300 to form the main body part 30, and the cross section of the inner cavity of the main body part 30 is isosceles trapezoid; the first inclined side wall 301 and the second inclined side wall 302 are respectively inclined towards the second panel 2, and when sound waves are emitted to the side surface of the first sound absorption column 4, the sound waves can be reflected into the resonant cavity, so that sound absorption and noise reduction are facilitated.
The first narrow side wall 311 and the second narrow side wall 312 are connected to the outer side wall 310 to form the convex portion 31, respectively, and the cross-sectional shape of the inner cavity of the convex portion 31 is rectangular. Bulge 31 sets up the top position at main part 30, and the main part 30 that the inner chamber cross-section is isosceles trapezoid has been connected with bulge 31 that the inner chamber cross-section is the rectangle and has constituteed the helmholtz resonator 3 that has hexagonal prism shape inner chamber, and inside wall 300 sets up with the inner wall of the first panel 1 of laminating, and lateral wall 310 sets up in parallel with inside wall 300, and first oblique lateral wall 301, first narrow lateral wall 311 connect on the same side, and the second is oblique lateral wall 302, second narrow lateral wall 312 connects at the opposite side.
An included angle between the first oblique side wall 301 and the inner side wall 300 is an acute angle, and the first oblique side wall 301 and the second oblique side wall 302 are respectively and symmetrically arranged at edge positions of the inner side wall 300. Specifically, the included angle between the first oblique side wall 301 and the inner side wall 300 is 30 °, and the through hole 32 is formed in the second oblique side wall 302. It should be noted that, in order to eliminate the road noise more accurately, the noise sound wave test is performed on the environment around the road before the construction, and then the dimension of the helmholtz resonant cavity is designed correspondingly, so as to cancel the noise sound wave of the main frequency to the maximum extent. In addition, still can make up the setting with different helmholtz resonators 3, utilize the helmholtz resonance chamber of equidimension not to play corresponding offset to the noise sound wave of different frequencies to realize more effective amortization purpose.
The outer contour of the first sound absorbing column structure 4 is a triangular prism, the first sound absorbing column structure 4 and the helmholtz resonator 3 are alternately arranged in parallel, and a sound transmission interval 41 is reserved between the first sound absorbing column structure 4 and the helmholtz resonator 3. The first sound absorbing column structures 4 and the Helmholtz resonators 3 are alternately arranged in parallel, so that the uniformity of the sound attenuation effect of the whole sound barrier is ensured. A second sound-absorbing pipe body 5 located at an edge position is further provided between the first panel 1 and the second panel 2, and sound-absorbing filler inside the second sound-absorbing pipe body 5. It should be noted that, the sound-absorbing filler of the first sound-absorbing column structure 4 and the sound-absorbing filler of the second sound-absorbing pipe body 5 may be glass wool, the glass wool has a large number of communicating gaps inside, and sound waves are lost in the communicating gaps after entering the glass wool, so as to achieve the effects of buffering and absorbing noise. In other embodiments, the glass wool may also be replaced by mineral wool, rock wool, inorganic fiber materials, and the like.
The first sound absorbing column structure 4 is bonded on the inner wall of the first panel 1 through foam glue, the second sound absorbing pipe body 5 is fixedly connected with the second panel 2, and the second sound absorbing pipe body 5 is fixedly arranged in the groove 20 of the second panel 2; the sound barrier containing the air resonant cavity further comprises an outer frame 6, the outer frame 6 is fixedly connected with the first panel 1 and the second panel 2 respectively, the outer frame 6 is made of H-shaped steel, the first panel 1 and the second panel 2 are convenient to install and position through the outer frame 6, and the outer frame 6 is used for sealing the edge of the sound barrier. In addition, first panel 1 and second panel 2 all adopt aluminum alloy plate to make, have evenly seted up tripe hole 10 on first panel 2, ensure that the noise can get into the inside of sound barrier smoothly to prevent that rainwater infiltration from influencing its noise cancelling action.
In order to realize the perspective of the whole sound barrier, the transparent sound insulation window 7 is arranged in the middle of the sound barrier, and the transparent sound insulation window 7 is made of double-layer transparent acrylic plates, so that a good perspective effect can be ensured, and an effective partition effect on noise can be realized.
In other embodiments of the sound barrier including an air resonance cavity according to the present invention, in order to meet different requirements, the included angle between the first inclined sidewall and the inner sidewall may be designed to be 15 °, or 45 °, or any angle between 15 ° and 45 °, so that a hexagonal prism-shaped helmholtz resonance cavity can be formed. In addition, the opening position of the through hole may be not limited to the first oblique sidewall in embodiment 1, and the through hole may be formed on the second oblique sidewall of the helmholtz resonator, so that the noise wave may enter the helmholtz resonator.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. A sound barrier containing air resonance cavities is characterized by comprising a first panel and a second panel which are arranged in parallel at intervals, wherein a Helmholtz resonator is arranged between the first panel and the second panel, the Helmholtz resonance cavities are arranged inside the Helmholtz resonator, and a plurality of through holes communicated with the Helmholtz resonance cavities are formed in the Helmholtz resonator;
still be equipped with first sound absorption column structure between first panel and the second panel, the inside of first sound absorption column structure is equipped with inhales the sound filler, a plurality of perforation have been seted up on the first sound absorption column structure.
2. The sound barrier of claim 1, wherein the Helmholtz resonator is a hollow tubular structure, the Helmholtz resonator has a prismatic outer contour, the Helmholtz resonator comprises a main body portion and a bulge portion, the inner wall of the second panel is provided with a groove matching the bulge portion, the inner cavity of the main body portion is communicated with the inner cavity of the bulge portion to form a prismatic inner cavity, and the prismatic inner cavity forms the Helmholtz resonator.
3. The sound barrier of claim 2, wherein the outer contour of the Helmholtz resonator is hexagonal prism shaped, the Helmholtz resonator comprises an inner sidewall, a first oblique sidewall, a second oblique sidewall, a first narrow sidewall, a second narrow sidewall and an outer sidewall, the first oblique sidewall and the second oblique sidewall are respectively connected with the inner sidewall to form the main body portion, and the cross-sectional shape of the inner cavity of the main body portion is isosceles trapezoid; the first narrow side wall and the second narrow side wall are respectively connected with the outer side wall to form a protruding part, and the cross section of an inner cavity of the protruding part is rectangular.
4. The sound barrier of claim 3, wherein the angle between the first inclined sidewall and the inner sidewall is an acute angle, and the first inclined sidewall and the second inclined sidewall are symmetrically disposed at the edge of the inner sidewall.
5. The sound barrier of claim 4, wherein said first angled sidewall is at any angle between 15 ° and 45 ° to said inner sidewall.
6. The sound barrier comprising an air resonance cavity according to claim 5, wherein said through hole opens on said first or second slanted sidewall.
7. The sound barrier of claim 1, wherein the outer contour of the first sound absorbing pillar structure is a triangular prism, the first sound absorbing pillar structure and the helmholtz resonator are alternately arranged in parallel, and a sound transmission space is reserved between the first sound absorbing pillar structure and the helmholtz resonator.
8. The sound barrier of claim 1, wherein a second acoustical tube is further provided between said first and second panels at an edge location, said acoustical filler being provided inside said second acoustical tube, said second acoustical tube being fixedly attached to said second panel.
9. The sound barrier of claim 1, wherein the sound barrier further comprises an outer frame, the outer frame is fixedly connected to the first panel and the second panel, and the first panel is uniformly perforated with louver holes.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113129860A (en) * | 2021-04-09 | 2021-07-16 | 西安建筑科技大学 | Acoustic metamaterial of foamed aluminum coupled Helmholtz resonator and preparation method thereof |
| CN114855660A (en) * | 2022-06-01 | 2022-08-05 | 重庆交通大学 | Phononic crystal sound absorber, sound barrier and using and mounting method |
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| CN114855660A (en) * | 2022-06-01 | 2022-08-05 | 重庆交通大学 | Phononic crystal sound absorber, sound barrier and using and mounting method |
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| CN112227237B (en) | 2022-04-29 |
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