CN108334726A - A kind of urban area road noise distribution forecasting method - Google Patents
A kind of urban area road noise distribution forecasting method Download PDFInfo
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Abstract
The present invention proposes a kind of urban area road noise distribution forecasting method, including：S1, mesh generation is carried out to urban area map, urban area is divided into series of rectangular tile；S2, each tile is individually calculated, calculated level face receiving point and building surface receive spot noise figure；S3, all tiles of traversal, obtain the noise figure of the noise Rx point in each tile, and the traffic noise distribution situation of urban area is obtained to obtain prediction.Method proposed by the present invention has taken into account computational efficiency and computational accuracy, and the noise profile for being suitable for City-scale calculates, and can preferably carry out traffic noise forecast of distribution.
Description
Technical field
The present invention relates to the technical fields of traffic noise prediction and space three-dimensional geometry, more particularly, to a kind of city
City region road noise distribution forecasting method, this method be using in city building distribution and urban highway traffic parameter as
Calculating parameter.
Background technology
With the rapid development of society, what road project construction was carried out is very intensive extensive, before the road project implementation, all
It needs to carry out project environment impact evaluation, the influence that can generate ambient enviroment project is predicted, with the knot of forecast assessment
Fruit is modified item goal programming as reference, takes suitable environmental protective measure, to reduce project as much as possible to ring
The harmful effect that border generates.After road is built up, huge traffic noise will be generated, influences resident living, therefore in project construction
Stage needs to predict the noise profile situation that road generates, and proposes rational solution.Therefore, metropolitan district is carried out
The prediction of domain noise profile situation be it is very necessary with it is crucial.
It is mainly calculated at present by prediction model about the noise prediction of urban area, according to the generation of road traffic
Pattern drawing is established in the influence etc. of feature, noise transmission rule and distribution of obstacles to propagation, by (such as the traffic of required data
Flow data) it is input in model and carries out prediction calculating, analog approach goes out traffic noise situation in region.Noise is being calculated in city
When attenuation when regional spread, have based on theory of wave acoustics, consider acoustic propagation process include reflection, diffraction etc. specifically
The computational methods of details；Simultaneously also have based on iso standard, using on acoustic transmission path the distribution character of buildings as
The computational methods of calculation basis.The former calculation amount is huge, urban area building be distributed irregular and number more than in the case of,
Feasibility is relatively low.The latter is by calculating the building of building density and neighbouring road on acoustic propagation path along road direction
Density, obtain under two-dimensional case sound in the attenuation of buildings.China introduces the standard as national standard, existing
Some algorithms based on the standard solve decay calculation of the outdoor sound of three-dimensional under partial picture in buildings, but it is right
When building layout complexity, building geometry are irregular, there is very big error in existing algorithm so that attenuation
Result of calculation and actual measured results have very big gap.
Invention content
The present invention proposes a kind of urban area road noise distribution forecasting method, mainly solves the prior art about sound
The problem of cannot taking into account precision and efficiency simultaneously in terms of attenuation calculating when being propagated in the building of urban compact.The present invention carries
The method gone out obtains the noise figure in urban area somewhere from two generation of traffic noise, propagation attenuation processes.
To achieve the goals above, the technology that the present invention uses is specially：
Content involved by this urban area road noise distribution forecasting method includes road, sound barrier, building, noise
Receiving point；Wherein road sends out noise as sound source；Sound barrier blocks noise；Building blocks noise；Noise Rx point receives
Noise is divided into ground receiver point and building surface receiving point.
A kind of urban area road noise distribution forecasting method, including：
S1, mesh generation is carried out to urban area map, urban area is divided into series of rectangular tile；
S2, each tile is individually calculated, calculated level face receiving point and building surface receive spot noise figure；
Its detailed process is：
(1) several noise Rx points being evenly arranged in each tile element；
(2) road in each tile is segmented, obtains series of road section；
(3) the noise source strength of a certain road segment segment is calculated using traffic information as parameter, the traffic information includes
The magnitude of traffic flow and average link speed；
(4) the noise Rx point in tile is traversed；
(5) all road segment segments in tile are traversed；
(6) calculate noise Rx point when without any blockage some road segment segment to the noise figure L at the noise Rx point0, L0
Only to consider noise figure of the sound with range attenuation, i.e., noise figure when unobstructed,
(7) it is directed to the noise Rx point, inquires and whether there is sound barrier effect of blocking to it in tile element, there are sound
Barrier then calculates sound barrier attenuation Δ Lbarrier；
(8) occlusion effect of the buildings to noise is calculated, that is, calculates buildings attenuation Abuilding；
(9) with it is unobstructed when noise figure L0Subtract pad value Δ LbarrierWith Abuilding, the road segment segment is obtained to the reception
The noise figure L of point0-ΔLbarrier-Abuilding；
(10) (5)-(9) are repeated, calculates in tile that all road segment segments are to the noise figure of the noise Rx point, by all roads
Section is overlapped the noise figure of the receiving point to obtain the noise Rx spot noise figure.
(11) (4)-(10) are repeated, calculates the noise figure of all noise Rx points in tile；
S3, all tiles of traversal, obtain the noise figure of the noise Rx point in each tile, and metropolitan district is obtained to obtain prediction
The traffic noise distribution situation in domain.
Further, mesh generation is to take interval T respectively in Gauss abscissa, Gauss ordinate direction, will entirely be counted
It calculates area map and is divided into series of rectangular tile element.
Further, the roadway segment method in step (2) is to build triangle with noise Rx point and road endpoint, right
N deciles are carried out by the apex angle of triangle of noise Rx point, every N bisector intersects with road, and road is divided into N+1 sections.
Further, the buildings attenuation is divided into buildings attenuation first item and buildings attenuation the
Binomial；
Buildings attenuation first item Abuilding1It is to be determined by the buildings distribution characteristics on acoustic propagation path, meter
Calculate the volume accounting C and acoustic propagation path length L that parameter includes buildings on acoustic propagation pathb, specific formula for calculation is
Abuilding1=0.1CLb；Wherein, buildings volume accounting C refers to building tetrahedron with sound source and noise Rx point, four
The sum of building volume in the body of face accounts for the tetrahedral volume ratio；
Buildings attenuation Section 2 Abuilding2It is to be determined by the building distribution characteristics for closing on road, calculating parameter
It is sound source close to buildings in the area accounting p where sound source on facade, specific calculation formula is Abuilding2=-10lg
(1-p)；Wherein, the sound source close to buildings is referred to along acoustic propagation direction, the building within sound source d；It is described
Area accounting p is that projected area of the sound source close to buildings on the perpendicular vertical with two-dimentional acoustic propagation direction accounts for this vertically
The ratio of plane,S0For perspective plane of the source close to buildings on the perpendicular vertical with two-dimentional acoustic propagation direction
Product, S are the perpendicular area.
The present invention is a kind of efficiently accurate urban area noise profile prediction technique, compared with the prior art, the present invention
The precision of traffic noise prediction is improved under the premise of not losing accuracy.When calculating weakening traffic noise, consider in city
Sound barrier block effect and the building effect of blocking, wherein the building effect of blocking with the distribution characteristics of buildings be according to
According to being calculated from three-dimensional spatial analysis level so that prediction effect be actually more consistent.
Description of the drawings
Fig. 1 is the prediction flow chart of the present invention；
Fig. 2 is roadway segment schematic diagram of the present invention；
Fig. 3 is that buildings of the present invention decaying first item calculates schematic diagram.
Fig. 4 is that buildings Section 2 of the present invention calculates schematic diagram.
Specific implementation mode
The specific measures for implementation of the present invention are described in detail below in conjunction with the accompanying drawings.It should be noted that this hair
It is bright to be applicable in but be not limited to following specific implementation examples.
In order to more clearly be illustrated to the present invention, specific embodiment is illustrated in conjunction with attached drawing.It needs to manage
Solution, following examples are only used for explaining the present invention, and the present invention is not limited to the examples.
As shown in Figure 1, the present invention proposes a kind of urban area road noise distribution forecasting method.First to urban area
Map piecemeal is carried out, a series of tile element is obtained, individually calculates each tile element.It is actually meter to calculate tile element
The receiving point arranged in tile element is calculated, horizontal plane receiving point and building surface receiving point are divided into.Calculating each reception
When point, segmentation calculating is carried out to road, segmentation method is as shown in Fig. 2, two endpoints of receiving point and road are attached
Angle ∠ AOB are formed, ∠ AOB are subjected to decile according to scan angle theta, every bisector intersects with road, is segmented to road, most
After obtain one group of road segment segment.After being segmented, model is discharged according to traffic noise, calculates making an uproar for each road segment segment
Sound source is strong, when calculating the noise at noise Rx point, needs road piecemeal all in piecemeal being included in calculating.Carrying out certain
When a road segment segment is to noise figure at some noise Rx point, the noise effect of blocking that sound barrier is brought with buildings is calculated,
Wherein, the buildings effect of blocking is divided into two calculating：Buildings decaying first item, buildings decaying Section 2.Building
Using building density on acoustic propagation path as calculation basis when object group decaying first item calculates, as shown in figure 3, buildings first
Item decay formula is Abuilding1=0.1CLb, wherein C refers to building density on acoustic propagation path, is building in figure
Dotted portion volume accounts for the volume ratio of the tetrahedron ABOD constructed.Buildings decay Section 2 calculating with neighbouring road
Building along road projected area be calculation basis, as shown in figure 4, buildings Section 2 decay formula be Abuilding2
=-10lg (1-p), wherein p be building projected area accounting, show as in Fig. 4 two buildings projected area account for it is vertical
The ratio of face ABA'B' areas.
After all receiving points in the block to all points calculates, you can obtain the traffic noise point of urban area with prediction
Butut.
Claims (4)
1. a kind of urban area road noise distribution forecasting method, which is characterized in that include the following steps：
S1, mesh generation is carried out to urban area map, urban area is divided into series of rectangular tile；
S2, each tile is individually calculated, calculated level face receiving point and building surface receive spot noise figure；It has
Body process is：
(1) several noise Rx points being evenly arranged in each tile element；
(2) road in each tile is segmented, obtains series of road section；
(3) the noise source strength of a certain road segment segment is calculated using traffic information as parameter, the traffic information includes traffic
Flow and average link speed；
(4) the noise Rx point in tile is traversed；
(5) all road segment segments in tile are traversed；
(6) calculate noise Rx point when without any blockage some road segment segment to the noise figure L at the noise Rx point0, L0For only
Consideration sound is with the noise figure of range attenuation, i.e., noise figure when unobstructed,
(7) it is directed to the noise Rx point, inquires and whether there is sound barrier effect of blocking to it in tile element, there are sound barriers
Then calculate sound barrier attenuation Δ Lbarrier；
(8) occlusion effect of the buildings to noise is calculated, that is, calculates buildings attenuation Abuilding；
(9) with it is unobstructed when noise figure L0Subtract pad value Δ LbarrierWith Abuilding, obtain the road segment segment and make an uproar to the receiving point
Sound value L0-ΔLbarrier-Abuilding；
(10) (5)-(9) are repeated, calculates in tile that all road segment segments are to the noise figure of the noise Rx point, by all road segment segments pair
The noise figure of the receiving point is overlapped to obtain the noise Rx spot noise figure.
(11) (4)-(10) are repeated, calculates the noise figure of all noise Rx points in tile；
S3, all tiles of traversal, obtain the noise figure of the noise Rx point in each tile, and urban area is obtained to obtain prediction
Traffic noise distribution situation.
2. road noise distribution forecasting method in urban area according to claim 1, which is characterized in that mesh generation be
Interval T is taken on Gauss abscissa, Gauss ordinate direction respectively, entire zoning map is divided into series of rectangular tile list
Member.
3. the acoustic attenuation prediction technique of City Building group according to claim 1, which is characterized in that in step (2)
Roadway segment method is to build triangle with noise Rx point and road endpoint, to using noise Rx point as the apex angle of triangle into
Row N deciles, every N bisector intersect with road, and road is divided into N+1 sections.
4. the acoustic attenuation prediction technique of City Building group according to claim 1, which is characterized in that the buildings
Attenuation is divided into buildings attenuation first item and buildings attenuation Section 2；
Buildings attenuation first item Abuilding1It is to be determined by the buildings distribution characteristics on acoustic propagation path, calculates ginseng
Number includes the volume accounting C and acoustic propagation path length L of buildings on acoustic propagation pathb, specific formula for calculation Abuilding1
=0.1CLb；Wherein, buildings volume accounting C refers to building tetrahedron with sound source and noise Rx point, in tetrahedron
The sum of building volume account for the tetrahedral volume ratio；
Buildings attenuation Section 2 Abuilding2It is to determine that calculating parameter is sound by the building distribution characteristics for closing on road
For source close to buildings in the area accounting p where sound source on facade, specific calculation formula is Abuilding2=-10lg (1-p)；
Wherein, the sound source close to buildings is referred to along acoustic propagation direction, the building within sound source d；The area accounts for
It is that projected area of the sound source close to buildings on the perpendicular vertical with two-dimentional acoustic propagation direction accounts for the perpendicular than p
Ratio,S0For projected area of the source close to buildings on the perpendicular vertical with two-dimentional acoustic propagation direction, S is should
Perpendicular area.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109405962A (en) * | 2018-11-21 | 2019-03-01 | 中山大学 | A kind of road traffic noise frequency spectrum calculation method |
| CN109443526A (en) * | 2018-11-09 | 2019-03-08 | 中山大学 | A kind of noise automated monitor point arrangement method based on Noise map |
| CN116108672A (en) * | 2023-02-17 | 2023-05-12 | 南京声远声学科技有限公司 | Outdoor sound propagation prediction model construction method based on geographic information system |
| CN117848365A (en) * | 2023-12-12 | 2024-04-09 | 西藏北斗森荣科技(集团)股份有限公司 | Navigation route planning system based on Beidou positioning |
| CN117848365B (en) * | 2023-12-12 | 2024-07-05 | 西藏北斗森荣科技(集团)股份有限公司 | Navigation route planning system based on Beidou positioning |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443526A (en) * | 2018-11-09 | 2019-03-08 | 中山大学 | A kind of noise automated monitor point arrangement method based on Noise map |
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| CN116108672A (en) * | 2023-02-17 | 2023-05-12 | 南京声远声学科技有限公司 | Outdoor sound propagation prediction model construction method based on geographic information system |
| CN116108672B (en) * | 2023-02-17 | 2024-01-23 | 南京声远声学科技有限公司 | Outdoor sound propagation prediction model construction method based on geographic information system |
| CN117848365A (en) * | 2023-12-12 | 2024-04-09 | 西藏北斗森荣科技(集团)股份有限公司 | Navigation route planning system based on Beidou positioning |
| CN117848365B (en) * | 2023-12-12 | 2024-07-05 | 西藏北斗森荣科技(集团)股份有限公司 | Navigation route planning system based on Beidou positioning |
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