CN109065013A - A kind of apical dominance design method of sound barrier based on flow resistance and surface density coupling gradual change - Google Patents
A kind of apical dominance design method of sound barrier based on flow resistance and surface density coupling gradual change Download PDFInfo
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- CN109065013A CN109065013A CN201810984219.8A CN201810984219A CN109065013A CN 109065013 A CN109065013 A CN 109065013A CN 201810984219 A CN201810984219 A CN 201810984219A CN 109065013 A CN109065013 A CN 109065013A
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- flow resistance
- surface density
- sound barrier
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- apical dominance
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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
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
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- Acoustics & Sound (AREA)
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Abstract
The apical dominance design method of sound barrier based on flow resistance and surface density coupling gradual change that the invention discloses a kind of, flow resistance and surface density of the sound barrier from top to bottom end couple gradual change, for the sound barrier from top to bottom end under the premise of flow resistance and surface density coupling gradual change, shape can be arbitrary face structure；The sound barrier that its is proposed in the present invention is theoretical, computation model, more conventional sound barrier, tremendous increase can be obtained in terms of anti-acoustic capability, and reasonable surface density and flow resistance Coupling Design can be carried out by the noise frequency that is directed to of emphasis as needed, the noise reduction effect being optimal, target frequency noise can be greatly reduced in more traditional sound barrier, and theoretical maximum noise reduction amplitude can reach 25dB；Sound barrier in the present invention, structure is simple, easy to maintain, can reach huge noise reduction effect without increasing.
Description
Technical field
The present invention relates to sound noise process field, relate in particular to a kind of based on flow resistance and surface density coupling gradual change
Apical dominance design method of sound barrier.
Background technique
With the development of railway construction and urban transportation, traffic noise pollution is increasingly severe, urgently to be resolved.Sound barrier is made
For a kind of effective ways for reducing traffic noise pollution, oneself is at home and abroad widely used.How to effectively utilize
This noise reduction measure of sound barrier, makes it play maximum economic and technical effect, has for improving resident living environmental quality
Important meaning.
Because there is the noise source at tip in current sound barrier, no matter what structure sound barrier uses, directly
Structure vertical or in upper end use deformation, but because the design of sound barrier entirety is all made of same material and structure, nothing
By how to handle, noise reduction effect is very bad, is only capable of reducing 3.6-6.5dB.Actual noise source is only simple
The tip of sound barrier is changed to from a position, noise reduction has little significance.
Summary of the invention
The purpose of the present invention is devise a kind of half nothing from flowing control, particle vibration and medium acoustic propagation principle
Limit space apical dominance sound barrier simultaneously gives its theoretical model, proposes one kind with sound barrier top particle velocity gesture as optimization
The noise reduction optimization algorithm of target.By Proper Match surface density and flow resistance, in designated frequency range can pole increase substantially sound
The insertion loss of barrier reaches optimal noise reduction effect in summary.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of apical dominance design method of sound barrier based on flow resistance and surface density coupling gradual change, the sound barrier is from top
Flow resistance and surface density to bottom end couple gradual change.
In the above-mentioned technical solutions, the sound barrier is from top to bottom end in the premise of flow resistance and surface density coupling gradual change
Under, shape can be arbitrary face structure.
In the above-mentioned technical solutions, the sound barrier includes that the solid of lower part support keeps away the gradation zone on face and top.
In the above-mentioned technical solutions, the external surface structure of the gradation zone on the top can be the inclined-plane of gradual change.
In the above-mentioned technical solutions, it is carried out not in the design that the flow resistance and surface density couple according to the different of noise frequency
With design.
In the above-mentioned technical solutions, flow resistance and surface density coupling gradual change need to meet following condition:
Wherein: S is solid wall surface, and A is that flow resistance and surface density couple gradation zone；F is free space,For P point
The spot speed gesture after shielding,Particle velocity gesture is represented, is obtained by solving above-mentioned partial differential equationIt can characterize
Acoustic pressure at observation point Q.
By adopting the above-described technical solution, the beneficial effects of the present invention are:
The sound barrier that its is proposed in the present invention is theoretical, computation model, and more conventional sound barrier can obtain huge in terms of anti-acoustic capability
It is big to be promoted, and can emphasis is directed to as needed noise frequency carry out reasonable surface density and flow resistance Coupling Design, be optimal
Noise reduction effect, target frequency noise can be greatly reduced in more traditional sound barrier, and theoretical maximum noise reduction amplitude can reach 25dB；This hair
Sound barrier in bright, structure is simple, easy to maintain, can reach huge noise reduction effect without increasing.It can be in outstanding noise reduction
Under the premise of, production and maintenance cost are saved, and applied widely, to environment and geographical location without particular/special requirement.
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 is semi-infinite long apical dominance sound barrier theoretical model；
Fig. 2 is the observation point noise reduction effect that surface density and flow resistance are reasonably selected under assigned frequency；
Fig. 3 is theoretical maximum noise reduction amplitude under each frequency.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Embodiment one
It include two parts as shown in Figure 1, establishing semi-infinite long apical dominance sound barrier model, the lower part region S is solid wall
Face, top A are that flow resistance and surface density couple gradation zone；F is free space, and left side Ω 1 is the region sound source Ps, right half
Portion Ω 2 is noise suppressed region, and Φ 1 is left side air particle velocity gesture, and Φ 2 is right side air particle velocity gesture.
In the design of sound barrier, the structure of the region S and a-quadrant can be can be using arbitrary structures conventional at present
Planar structure, is also possible to curved-surface structure, can be the bending plate with inclination angle in other words.But no matter any structure is used,
It only needs to guarantee a bit, is exactly that a-quadrant is necessary for flow resistance and surface density coupling gradual change from the top to the bottom, as long as meeting this
The shape of part, sound barrier can be arbitrarily devised.
, can be by the material of change sound barrier of course for flow resistance and surface density coupling gradual change is met, or provide one
Special structure is planted to realize.Such as the wedge shape structure of same material, just by the consecutive variations of thickness realize flow resistance with
The continuously linear gradual change of surface density.
It is introduced in the present inventionThe concept of particle velocity gesture is represented, which can state the speed of whole field particle from the angle of field theory
Degree, pressure, thenIt can indicate pressure oscillation i.e. this acoustic pressure size.Spot speed gesture when being located at left side for P point,Spot speed gesture when being located at right side for P point.When P point belongs to the region F, acoustic propagation is direct projection, then measurement point velocity potential
It is represented byAccording to spherical wave sound wave propagation equation, the velocity potential of direct projection sound be may be expressed as:
When P point belongs to a-quadrant, the velocity potential field amount difference of left and right half-court is represented by diffraction and transmission two parts, then has:
It, can be by this identical partial differential equation of three parts synthesized form by the coefficient matrix at combination S, F, A:
Exp (ikr)/r is spherical wave distribution factor, and n is unit normal vector, is obtained eventually by above-mentioned partial differential equation are solved
?The acoustic pressure at observation point Q can be characterized.
Wherein in formula (2):
(wherein: p1Indicate barrier left pressure, p2Indicate that barrier right atrial pressure, v indicate particle velocity, rsIndicate sound barrier
The flow resistance of material, ω indicate angular frequency, MsIndicate the surface density of acoustic barrier material, vsIndicate particle reference velocity, vmIndicate particle
Vibration velocity.)
Above-mentioned equation group simultaneous can carry out numerical solution.Under assigned frequency (this is sentenced for 500Hz), it can be obtained and flowing
Under resistance and surface density coupling, SPL (measuring noise reduction effect) variation in monitoring point is rationally selected as shown in Fig. 2, under i.e. corresponding surface density Ms
Selecting flow resistance, (flow resistance and Ms are linearly related herein, and taking its ratio is that k), can get significantly noise reduction effect (nearly 13dB in figure).
(200Hz~2000Hz) theoretical maximum noise reduction amplitude such as Fig. 3 institute can be obtained within the scope of conventional frequency through the above steps
Show.
Therefore the sound barrier that proposes is theoretical in the present invention, computation model, and more conventional sound barrier can obtain in terms of anti-acoustic capability
Obtain tremendous increase.And reasonable surface density and flow resistance Coupling Design can be carried out by the noise frequency that is directed to of emphasis as needed, reach
Optimal noise reduction effect.
The invention is not limited to specific embodiments above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (6)
1. a kind of apical dominance design method of sound barrier based on flow resistance and surface density coupling gradual change, it is characterised in that the sound-screen
Hinder flow resistance and surface density from top to bottom end and couples gradual change.
2. a kind of apical dominance Sound Barrier Design side based on flow resistance and surface density coupling gradual change according to claim 1
Method, it is characterised in that for the sound barrier from top to bottom end under the premise of flow resistance and surface density coupling gradual change, shape can be with
For arbitrary face structure.
3. a kind of apical dominance Sound Barrier Design side based on flow resistance and surface density coupling gradual change according to claim 2
Method, it is characterised in that the sound barrier includes that the solid of lower part support keeps away the gradation zone on face and top.
4. a kind of apical dominance Sound Barrier Design side based on flow resistance and surface density coupling gradual change according to claim 3
Method, it is characterised in that the external surface structure of the gradation zone on the top can be the inclined-plane of gradual change.
5. a kind of apical dominance Sound Barrier Design side based on flow resistance and surface density coupling gradual change according to claim 1
Method, it is characterised in that the design that the flow resistance and surface density couple carries out different designs according to the different of noise frequency.
6. a kind of -5 any apical dominance sound barriers based on flow resistance and surface density coupling gradual change are set according to claim 1
Meter method, it is characterised in that its flow resistance and surface density coupling gradual change need to meet following condition:
Wherein: S is solid wall surface, and A is that flow resistance and surface density couple gradation zone；F is free space,It is located at screen for P point
The spot speed gesture after covering,Particle velocity gesture is represented, is obtained by solving above-mentioned partial differential equationObservation can be characterized
Acoustic pressure at point Q.
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| CN201810984219.8A CN109065013A (en) | 2018-08-28 | 2018-08-28 | A kind of apical dominance design method of sound barrier based on flow resistance and surface density coupling gradual change |
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| CN201810984219.8A CN109065013A (en) | 2018-08-28 | 2018-08-28 | A kind of apical dominance design method of sound barrier based on flow resistance and surface density coupling gradual change |
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Citations (5)
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|---|---|---|---|---|
| CN101982613A (en) * | 2010-10-20 | 2011-03-02 | 北京士兴钢结构有限公司 | Compound sound insulation-absorption barrier board |
| CN104136695A (en) * | 2011-01-24 | 2014-11-05 | 学校法人关西大学 | Sound-absorbing body and sound insulation wall equipped with same |
| CN104153305A (en) * | 2014-08-20 | 2014-11-19 | 朴太善 | Sound barrier and material and production technology of sound barrier |
| CN205348017U (en) * | 2015-09-01 | 2016-06-29 | 安境迩（上海）科技有限公司 | Acoustic absorber and use this acoustic absorber's sound barrier |
| CN106854855A (en) * | 2015-12-08 | 2017-06-16 | 北京知易普道技术有限责任公司 | A kind of sound absorber and the sound barrier using the sound absorber |
-
2018
- 2018-08-28 CN CN201810984219.8A patent/CN109065013A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101982613A (en) * | 2010-10-20 | 2011-03-02 | 北京士兴钢结构有限公司 | Compound sound insulation-absorption barrier board |
| CN104136695A (en) * | 2011-01-24 | 2014-11-05 | 学校法人关西大学 | Sound-absorbing body and sound insulation wall equipped with same |
| CN104153305A (en) * | 2014-08-20 | 2014-11-19 | 朴太善 | Sound barrier and material and production technology of sound barrier |
| CN205348017U (en) * | 2015-09-01 | 2016-06-29 | 安境迩（上海）科技有限公司 | Acoustic absorber and use this acoustic absorber's sound barrier |
| CN106854855A (en) * | 2015-12-08 | 2017-06-16 | 北京知易普道技术有限责任公司 | A kind of sound absorber and the sound barrier using the sound absorber |
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Application publication date: 20181221 |