CN204282239U - A kind of sound barrier top noise elimination structure - Google Patents
A kind of sound barrier top noise elimination structure Download PDFInfo
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- CN204282239U CN204282239U CN201420668306.XU CN201420668306U CN204282239U CN 204282239 U CN204282239 U CN 204282239U CN 201420668306 U CN201420668306 U CN 201420668306U CN 204282239 U CN204282239 U CN 204282239U
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Abstract
The utility model discloses a kind of sound barrier top noise elimination structure, comprise and interfere screen body, resonance sound-absorbing cylinder, column, screen body is interfered to be arc, column comprises vertical rod, snap ring and arc-shaped slot, snap ring and arc-shaped slot are all positioned at vertical rod top, space is left between snap ring and arc-shaped slot, sound barrier screen body both sides are provided with column, sound barrier screen body and vertical rod are connected, resonance sound-absorbing cylinder is positioned at above sound barrier screen body, resonance sound-absorbing cylinder two ends are separately positioned in snap ring, screen body is interfered to be arranged in the space between above-mentioned snap ring and arc-shaped slot, interfere the bottom of screen body to shield body with sound barrier to be connected, resonance sound-absorbing cylinder and sound barrier shield body and there is gap, the bottom of upright rod of column fixes on the ground.The utility model further can reduce the diffraction sound at sound barrier top, expands the sound shadow region scope of sound barrier, and structure is simple, is easy to realize.
Description
Technical field
The utility model belongs to the facility of noise abatement, is specifically related to a kind of sound barrier top noise elimination structure.
Background technology
The apex structure of existing sound barrier has good noise reduction to diffraction sound, and current domestic and international project is applied good top denoising structure and comprised resonance sound-absorbing cylindrical structure and interfere noise elimination structure.Resonance sound-absorbing cylinder mainly excites cylinder resonance absorption acoustic energy by sound, acoustical absorptivity is main relevant with the eigentone of cylinder, at present in noise-reducing design in order to make sound barrier there is no gap often by sound absorption cylinder with shield body and be rigidly connected (or closely cooperating), the resonance frequency of this connected mode to sound absorption cylinder impacts, and makes absorption low-frequency noise hydraulic performance decline; Interfere noise elimination structure to utilize the principle of interference of sound wave to be decreased through the noise at sound barrier top, have good noise reduction to all-bottom sound, but noise elimination frequency band is narrower, is not suitable for the highway traffic noise that frequency band is wider.
Summary of the invention
The purpose of this utility model is to provide a kind of sound barrier top noise elimination structure, effectively can reduce sound barrier top diffraction noise to the impact of sound shadow region.
The technical solution realizing the utility model object is: a kind of sound barrier top noise elimination structure, comprise and interfere screen body, resonance sound-absorbing cylinder, column, screen body is interfered to be arc, column comprises vertical rod, snap ring and arc-shaped slot, snap ring and arc-shaped slot are all positioned at vertical rod top, space is left between snap ring and arc-shaped slot, sound barrier screen body both sides are provided with column, sound barrier screen body and vertical rod are connected, resonance sound-absorbing cylinder is positioned at above sound barrier screen body, resonance sound-absorbing cylinder two ends are separately positioned in snap ring, screen body is interfered to be arranged in the space between above-mentioned snap ring and arc-shaped slot, interfere the bottom of screen body to shield body with sound barrier to be connected, resonance sound-absorbing cylinder and sound barrier shield body and there is gap, the bottom of upright rod of column fixes on the ground.
Above-mentioned resonance sound-absorbing cylinder and the sound barrier gap of shielding between body is 1-10cm.
Above-mentioned resonance sound-absorbing cylinder is thin walled shell cylinder, cylinder thickness 0.5mm-5mm.
Containing sound source to barrier distance a, sound source to the function of sound absorption cylinder heights b, frequency of source μ and resonance sound-absorbing cylinder h, relational expression should be met
Wherein:
μ---frequency of sound wave;
V---acoustic velocity, generally gets 340m/s;
A---sound source is to sound barrier screen body distance;
B---sound source and resonance sound-absorbing cylinder heights poor;
H---resonance sound-absorbing circular cylinder radius.
The utility model compared with prior art, its remarkable advantage: the interference screen body in the utility model and resonance sound-absorbing cylinder are formed interferes noise elimination structure, sound wave propagates into sound barrier superjacent air space along resonance sound-absorbing cylinder and the interference space of shielding between body and diffraction interference of sound disappears mutually; The sound barrier top of resonance sound-absorbing cylinder and interference noise elimination structure can reduce the impact of top sound diffraction on sound barrier shadow zone noise reduction in a large number, wherein interferes noise elimination structure can carry out noise reduction targetedly to low-frequency noise, remarkable in low-frequency range noise reduction.Resonance sound-absorbing cylinder has wider sound absorption frequency, has good noise reduction to most diffraction sound.
Accompanying drawing explanation
Fig. 1 is a kind of sound barrier top of the utility model noise elimination structure structure chart.
Fig. 2 is the explosive view of a kind of sound barrier top of the utility model noise elimination structure.
Fig. 3 is the top schematic diagram of a kind of sound barrier top of the utility model noise elimination structure.
Fig. 4 is the design diagram of the noise elimination frequency band of a kind of sound barrier top of the utility model noise elimination structure.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Composition graphs 1 and Fig. 2, a kind of sound barrier top noise elimination structure, comprise and interfere screen body 1, resonance sound-absorbing cylinder 2, sound barrier screen body 3 and column 4, screen body 1 is interfered to be arc, column 4 plays a supportive role, column 4 comprises vertical rod 4-1, snap ring 4-2 and arc-shaped slot 4-3, snap ring 4-2 and arc-shaped slot 4-3 is all positioned at vertical rod 4-1 top, space is left between snap ring 4-2 and arc-shaped slot 4-3, sound barrier screen body 3 both sides are provided with column 4, sound barrier screen body 3 is connected with the vertical rod 4-1 of column 4, resonance sound-absorbing cylinder 2 is positioned at above sound barrier screen body 3, resonance sound-absorbing cylinder 2 two ends are fixed in snap ring 4-2, screen body 1 is interfered to be bonded in the space between above-mentioned snap ring 4-2 and arc-shaped slot 4-3, interfere the bottom of screen body 1 to shield body 3 with sound barrier to be connected, resonance sound-absorbing cylinder 2 and sound barrier shield body 3 and there is gap, the vertical rod 4-1 of column 4 fixes on the ground.
Interfere screen body 1, sound barrier screen body 3 material is that in acrylic glass, fiber aluminium sheet, galvanized steel plain sheet, fiberfill fibers is cotton etc.Column 4, resonance sound-absorbing cylinder 2 material are the metal material such as steel, aluminium, iron.Resonance sound-absorbing cylinder 2 structure is thin walled shell cylinder, cylinder thickness 0.5mm-5mm.Resonance sound-absorbing cylinder 2 and the sound barrier gap of shielding between body 3 is 1-10cm.
Embodiment 1
A kind of sound barrier top noise elimination structure, comprise and interfere screen body 1, resonance sound-absorbing cylinder 2, sound barrier screen body 3 and column 4, screen body 1 is interfered to be arc, column 4 plays a supportive role, column 4 comprises vertical rod 4-1, snap ring 4-2 and arc-shaped slot 4-3, snap ring 4-2 and arc-shaped slot 4-3 is all positioned at vertical rod 4-1 top, space is left between snap ring 4-2 and arc-shaped slot 4-3, between the vertical rod 4-1 of two root posts 4 by bolt be connected sound barrier screen body 3, resonance sound-absorbing cylinder 2 is positioned at above sound barrier screen body 3, resonance sound-absorbing cylinder 2 two ends are bolted in snap ring 4-2, screen body 1 is interfered to be bonded in the space between above-mentioned snap ring 4-2 and arc-shaped slot 4-3, interfere the end of screen body 1 to shield body 3 with sound barrier to be connected, resonance sound-absorbing cylinder 2 and sound barrier shield body 3 and there is gap, the vertical rod 4-1 of column 4 is fixed on the ground by pre-embedded anchoring bolts.
Interference screen body 1, sound barrier screen body 3 material are acrylic glass, and column 4, resonance sound-absorbing cylinder 2 material are steel, the cylinder thickness 3mm of resonance sound-absorbing cylinder 2.Resonance sound-absorbing cylinder 2 and the sound barrier gap of shielding between body 3 is 5cm.
Resonance cylinder sound absorption principle: utilize resonance sound-absorbing cylinder 2 that acoustic energy is converted into mechanical energy, thus stress release treatment, wherein the resonance frequency of resonance sound-absorbing cylinder 2 and the frequency of noise close.
Interfere noise-cancelling theory: can cancel out each other when two sound waves that frequency same phase differs 180 ° meet, when after the sound wave namely produced when same sound source walks around different obstruct thing, distance differs half wavelength, phase 180 °, interferes and disappears mutually.
Composition graphs 3, the sound wave that sound source sends mainly contains A, B, C tri-kinds of propagation paths at sound barrier screen body 3 top.Resonance sound-absorbing cylinder 2 is walked around from sound barrier screen body 3 top in A path, B path strikes resonance sound-absorbing cylinder 2 from sound source, C path is passed through bottom resonance sound-absorbing cylinder 2, passes to sound barrier screen body 3 upper area via the space between sound absorption cylinder and interference screen body 1.Sound superposition above sound barrier screen body 3 of transmitting from A path and C path, when A path differs the half of distance for sound source wavelength with C path, phase 180 °, namely realizes interfering eliminating the noise.The noise passed through from B path strikes resonance sound-absorbing cylinder 2, and make resonance sound-absorbing cylinder 2 produce resonance, acoustic energy is converted into the kinetic energy of cylinder, thus realizes path B resonance sound-absorbing.
The sound absorption frequency of resonance sound-absorbing cylinder 2 is determined by the physical dimension of cylinder, material properties, can obtain according to existing cylinder modal calculation.
Frequency of noise elimination shields body 3 height by sound barrier and resonance sound-absorbing cylinder 2 size is determined, as shown in Figure 4, foundation interferes noise-cancelling theory in the design of noise elimination frequency band, the sound wave that same sound source sends is through different path, meet when stroke difference half wavelength, phase 180 °, interferes and disappears mutually.
Expression formula is:
According to geometrical principle by simplification of a formula be only containing sound source to barrier apart from (a), sound source to the function of absorb sound cylinder heights (b), frequency of source (μ) and resonance sound-absorbing cylinder (h).
Wherein:
μv＝λ；
μ---frequency of sound wave;
V---acoustic velocity, generally gets 340m/s;
λ---wave length of sound;
A---sound source is to sound barrier screen body distance;
B---sound source and resonance sound-absorbing cylinder heights poor;
C---sound source is to resonance sound-absorbing bottom of cylinder distance;
D---sound source to resonance sound-absorbing cylinder distance of center circle from;
E---sound source is to the tangential length of resonance sound-absorbing cylinder;
F, j---interfere the tangential length of point to resonance sound-absorbing cylinder of eliminating the noise;
I---resonance sound-absorbing bottom of cylinder is to 1/4 arc length of side and f tangency location.
H---resonance sound-absorbing circular cylinder radius.
By formula, sound absorption circular cylinder radius h and sound barrier height (sound source is apart from ground level+b+2h) can be designed according to frequency of source (μ) and sound source to barrier distance (a), reach the object of interfering and eliminating the noise.
Interference screen body in the utility model and resonance sound-absorbing cylinder are formed interferes noise elimination structure, and sound wave propagates into sound barrier superjacent air space along resonance sound-absorbing cylinder and the interference space of shielding between body and diffraction interference of sound disappears mutually; The sound barrier top of resonance sound-absorbing cylinder and interference noise elimination structure can reduce the impact of top sound diffraction on sound barrier shadow zone noise reduction in a large number, wherein interferes noise elimination structure can carry out noise reduction targetedly to low-frequency noise, remarkable in low-frequency range noise reduction.Resonance sound-absorbing cylinder has wider sound absorption frequency, has good noise reduction to most diffraction sound.
Claims (4)
1. a sound barrier top noise elimination structure, comprise and interfere screen body (1), resonance sound-absorbing cylinder (2), column (4), it is characterized in that: interfere screen body (1) to be arc, column (4) comprises vertical rod (4-1), snap ring (4-2) and arc-shaped slot (4-3), snap ring (4-2) and arc-shaped slot (4-3) are all positioned at vertical rod (4-1) top, space is left between snap ring (4-2) and arc-shaped slot (4-3), sound barrier screen body (3) both sides are provided with column (4), sound barrier screen body (3) and vertical rod (4-1) are connected, resonance sound-absorbing cylinder (2) is positioned at sound barrier screen body (3) top, resonance sound-absorbing cylinder (2) two ends are separately positioned in snap ring (4-2), screen body (1) is interfered to be arranged in the space between above-mentioned snap ring (4-2) and arc-shaped slot (4-3), interfere the bottom of screen body (1) to shield body (3) with sound barrier to be connected, resonance sound-absorbing cylinder (2) and sound barrier shield body (3) and there is gap, vertical rod (4-1) bottom of column (4) fixes on the ground.
2. sound barrier top according to claim 1 noise elimination structure, is characterized in that: above-mentioned resonance sound-absorbing cylinder (2) and the sound barrier gap of shielding between body (3) are 1-10cm.
3. sound barrier top according to claim 1 noise elimination structure, is characterized in that: above-mentioned resonance sound-absorbing cylinder (2) is thin walled shell cylinder, cylinder thickness 0.5mm-5mm.
4. sound barrier top according to claim 1 noise elimination structure, is characterized in that: containing sound source to barrier distance a, sound source to the function of sound absorption cylinder heights b, frequency of source μ and resonance sound-absorbing cylinder h, should meet relational expression
Wherein:
μ---frequency of sound wave;
V---acoustic velocity, generally gets 340m/s;
A---sound source is to sound barrier screen body distance;
B---sound source and resonance sound-absorbing cylinder heights poor;
H---resonance sound-absorbing circular cylinder radius.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420668306.XU CN204282239U (en) | 2014-11-10 | 2014-11-10 | A kind of sound barrier top noise elimination structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420668306.XU CN204282239U (en) | 2014-11-10 | 2014-11-10 | A kind of sound barrier top noise elimination structure |
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| CN204282239U true CN204282239U (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420668306.XU Withdrawn - After Issue CN204282239U (en) | 2014-11-10 | 2014-11-10 | A kind of sound barrier top noise elimination structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105603894A (en) * | 2014-11-10 | 2016-05-25 | 江苏省交通科学研究院股份有限公司 | Top-end noise elimination structure of sound barrier |
| CN111119085A (en) * | 2020-01-16 | 2020-05-08 | 湖南省交通科学研究院有限公司 | Sound barrier with semi-cylindrical top protruding structure |
-
2014
- 2014-11-10 CN CN201420668306.XU patent/CN204282239U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105603894A (en) * | 2014-11-10 | 2016-05-25 | 江苏省交通科学研究院股份有限公司 | Top-end noise elimination structure of sound barrier |
| CN105603894B (en) * | 2014-11-10 | 2018-06-26 | 苏交科集团股份有限公司 | A kind of sound barrier top noise elimination structure |
| CN111119085A (en) * | 2020-01-16 | 2020-05-08 | 湖南省交通科学研究院有限公司 | Sound barrier with semi-cylindrical top protruding structure |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150422 Effective date of abandoning: 20180626 |
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| AV01 | Patent right actively abandoned |