CN102708267A - High speed railway sound barrier insertion loss calculation method - Google Patents
High speed railway sound barrier insertion loss calculation method Download PDFInfo
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- CN102708267A CN102708267A CN2012101999786A CN201210199978A CN102708267A CN 102708267 A CN102708267 A CN 102708267A CN 2012101999786 A CN2012101999786 A CN 2012101999786A CN 201210199978 A CN201210199978 A CN 201210199978A CN 102708267 A CN102708267 A CN 102708267A
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Abstract
The invention discloses a high speed railway sound barrier insertion loss calculation method, which is provided according to a high speed railway sound source combination characteristic, a spectrum characteristic and a transmission characteristic, and aims to overcome the shortcomings in the conventional sound barrier insertion loss calculation. The high speed railway sound barrier insertion loss calculation method is applied to acoustic design of a high speed railway sound barrier, so that a theoretical noise reduction result of the high speed railway sound barrier can be calculated. The method comprises the following technical steps of: S1, determining a position relation between a protection target and a line; S2, determining a sound barrier height planned to be set and a horizontal distance from the line; S3, determining an equivalent position of a lower sound source; S4, calculating a sound path difference of the sound barrier to the lower equivalent sound source; S5, calculating insertion loss of the sound barrier to the lower equivalent sound source; and S6, calculating the total insertion loss of the sound barrier by adopting a correction mode.
Description
Technical field
The present invention relates to the engineering design of railway sound barrier, particularly the computing method of high speed railway sound barrier noise reduction.
Background technology
In the existing railway sound barrier engineering design; For calculating the theoretical noise reduction of differing heights sound barrier; And then the best of confirming sound barrier on this basis is provided with height, the endless sound barrier predictive mode of recommending in employing " environmental impact assessment technology guide rule (acoustic environment) " and " sound barrier acoustics design and the measuring technique standard ".The major parameter that relates in this predictive mode is the equivalent position and the equivalent frequency of sound source, and the equivalent position of sound source is chosen at the position of railway rail level, and equivalent frequency is chosen 500Hz.In general fast Railway Design, adopt the theoretical noise reduction of the sound barrier insertion sound barrier that loss calculation method obtained and the measured data of above-mentioned predictive mode identical basically.
Yet,, still adopt above-mentioned predictive mode to calculate sound barrier at present and insert loss for the high-speed railway more than the speed per hour 300km.Form complicated high-speed railway for sound source, there are notable difference in the frequency characteristic and the general fast railway of sound source on the one hand; On the other hand, because the significantly raising of road speed, the shared ratio of wheel-rail noise descended to some extent during sound source was formed, and bow net noise and aerodynamic noise proportion promote to some extent, and the sound source equivalent position is still single, and to fix on the position of rail level really no longer suitable.Measured result shows: the high speed railway sound barrier insertion loss according to existing method calculating obtains is very big with actual noise reduction difference, brings bigger difficulty to engineering design, has caused difficulty also for the environmental protection inspection and acceptance of having built up high-speed railway.
Summary of the invention
Insert the situation that loss calculation method is not suitable for high-speed railway to railway sound barrier in the prior art; The present invention releases new railway sound barrier and inserts loss calculation method; On the basis of lot of experiments; Adopt the sound source equivalent frequency and the equivalent position of suitable high-speed railway, revise sound barrier noise reduction computation schema, to insert the computing method of loss in the sound barrier design that is suitable for the above high-speed railway sound source characteristic of speed per hour 300km.
High speed railway sound barrier involved in the present invention inserts loss calculation method, and technical step comprises: confirm the protection target and the position of circuit concern S1, confirm to propose put the sound barrier height and apart from circuit horizontal range S2, confirm the bottom sound source equivalent position S3, calculate sound barrier to the path difference S4 of bottom equivalent source, calculate sound barrier to the insertion loss S5 of bottom equivalent source, the overall insertion loss value S6 of employing modification model calculating sound barrier.
The position relation of S1, definite protection target and circuit
The protection target is apart from the horizontal range l of railway outside central lines of track
1, the m of unit; Rail level and protection target receive the discrepancy in elevation h between the sound point
1, the m of unit.
S2, confirm to propose the height of putting sound barrier and apart from the circuit horizontal range
Propose and put sound barrier and exceed rail level height h
2, the m of unit; Propose and put the horizontal range l of sound barrier apart from railway outside central lines of track
2, the m of unit.
S
3, confirm the equivalent position of bottom sound source
For speed per hour 300km circuit, the above 0.6m of rail level is confirmed as in equivalent source position, bottom.
S
4, calculate the path difference of sound barrier to the bottom equivalent source
Sound barrier is to the path difference δ=A+B-d of bottom equivalent source
In the formula: A is the distance of sound source to the sound barrier top,
B receives sound to put to the distance on sound barrier top
D is sound source and receives the air line distance between the sound point,
S5, calculating sound barrier lose the insertion of bottom equivalent source
Application model is:
In the formula: R
DownBe the insertion loss of sound barrier to the bottom equivalent source;
F is a frequency of sound wave, gets 1250Hz; δ is a path difference, the m of unit;
C is the velocity of sound, gets 340m/s.
S6, employing modification model calculate the overall insertion loss value of sound barrier
The bottom sound source is delivered to after through sound barrier diffraction receive the sound point acoustic energy with the through acoustic energy that put by sound of top sound source superimposed after; Draw the noise level after the measure; Again with measure before noise level subtract each other, the sound barrier that promptly draws the double sound source pattern totally inserts the loss value.
Concrete employing pattern is:
In the formula: R
AlwaysFor total sound barrier inserts loss, the dB of unit;
R
DownBe the insertion loss of sound barrier to the bottom equivalent source, the dB of unit.
The present invention fully takes into account the practicality of computing method according to the sound field distribution character, has proposed the double sound source computing method, and being about to high-speed railway sound source simplification equivalence is upper and lower two parts.The top sound source is main with the bow net noise, and its equivalent position exceeds the acoustic shadow scope of the vertical sound barrier of ordinary straight between more than the rail level between 3.3～4.9m, approximately thinks that acoustic energy directly is transmitted to and receives point.The bottom sound source is main with wheel-rail noise and bottom aerodynamic noise, and sound barrier is mainly administered this partial noise.According to the analyzing and processing to the noise reduction test data of diverse location is set on the above circuit of speed per hour 300km such as Beijing-Tianjin inter-city railway, Beijing-Shanghai High-Speed Railway behind the sound barrier, propose for the high-speed railway more than the speed per hour 300km, equivalent frequency is chosen for 1250Hz.Through the sound barrier noise reduction of on operating line, surveying is carried out regretional analysis, when confirming to adopt the double sound source computing method, the equivalent height of bottom sound source should adopt the above 0.6m of rail level.Sound barrier is to the insertion loss R of bottom sound source
DownCan calculate through inserting the loss computation schema.Through analysis to test data, confirm that bottom equivalent source acoustic energy accounts for 87.5% of total acoustic energy, top equivalent source acoustic energy accounts for 12.5% of total acoustic energy.The bottom sound source is delivered to after through sound barrier diffraction receive the sound point acoustic energy with the through acoustic energy that put by sound of top sound source superimposed after; Draw the noise level after the measure; Again with measure before noise level subtract each other, promptly draw the insertion loss calculated value that adopts the double sound source computing method to draw.
High speed railway sound barrier involved in the present invention inserts loss calculation method; Propose according to high-speed railway sound source component characteristic, spectral characteristic and propagation characteristic; Overcome existing sound barrier and insert the defective that exists in the loss calculating; Be applied to the acoustics design of high speed railway sound barrier, to calculate the theoretical noise reduction of sound barrier.
Description of drawings
Fig. 1 inserts the loss calculation method schematic flow sheet for high speed railway sound barrier.
Description of symbols among the figure:
The position relation of S1, definite protection target and circuit,
S2, confirm to propose the height of putting sound barrier and apart from the circuit horizontal range,
S
3, confirm the equivalent position of bottom sound source,
S
4, calculate the path difference of sound barrier to the bottom equivalent source,
S5, calculating sound barrier lose the insertion of bottom equivalent source,
S6, the overall insertion of adopting modification model to calculate sound barrier are lost.
Embodiment
In conjunction with embodiment technical scheme of the present invention is described further.
The first village that embodiment, calculating close on high-speed railway proposes the sound barrier insertion loss of putting sound barrier
The first village is apart from proposing case: certain high-speed railway is closed in the first village, is 1 layer of building, and it is 30m apart from circuit outer rail center line minimum distance; The high-speed railway corresponding road section is the bridge form; Rail level 8.75m above ground level; Receive the sound point to be above 1.2m place, ground; Plan takes to be provided with the noise abatement measure of the high sound barrier of the above 2.05m of rail level, and sound barrier is 3.45m apart from the horizontal range of railway outside central lines of track, and the theoretical noise reduction of calculating sound barrier is that sound barrier inserts loss.
Concrete calculation procedure is following:
The position relation of S1, definite protection target and circuit
The protection target is apart from the horizontal range l at rail track center
1=30m;
Rail level and protection target receive the discrepancy in elevation h between the sound point
1=8.75-1.2=7.55m.
S2, confirm to propose the height of putting sound barrier and apart from the circuit horizontal range
Propose and put sound barrier and exceed rail level height h
2=2.05m.
Propose and put the horizontal range l of sound barrier apart from railway outside central lines of track
2=3.45m.
S
3, confirm the equivalent position of bottom sound source
For speed per hour 300km circuit, the above 0.6m of rail level is confirmed as in equivalent source position, bottom.
S
4, calculate the path difference of sound barrier to the bottom equivalent source
δ=A+B－d=1.07m。
S5, calculating sound barrier lose the insertion of bottom equivalent source
In the formula: f=1250Hz; δ=1.07m; C=340m/s.
Calculating can get, R
Down=10.4dB.
S6, the overall insertion loss of calculating sound barrier
The overall insertion loss of confirming sound barrier is 6.8dB, and is identical basically with the actual measurement noise reduction.
Claims (1)
1. a high speed railway sound barrier inserts loss calculation method, it is characterized in that: technical step comprises the position relation (S1) of confirming protection target and circuit, confirm to propose put the sound barrier height and apart from circuit horizontal range (S2), confirm the bottom sound source equivalent position (S3), calculate sound barrier to the path difference (S4) of bottom equivalent source, calculate sound barrier (S6) lost in the insertion loss (S5) of bottom equivalent source, the overall insertion of adopting modification model to calculate sound barrier;
The equivalent position of bottom sound source (S3) is confirmed as the above 0.6m of rail level;
The calculating sound barrier to insertion loss (S5) application model of bottom equivalent source is:
In the formula: R
DownBe the insertion loss of sound barrier to the bottom equivalent source,
F is the sound wave equivalent frequency, gets 1250Hz,
δ is a path difference,
C is the velocity of sound, gets 340m/s;
Calculate the overall insertion loss (S6) of sound barrier; The bottom sound source is delivered to after through sound barrier diffraction receive the sound point acoustic energy with the through acoustic energy that put by sound of top sound source superimposed after; Draw the noise level after the measure; Again with measure before noise level subtract each other, the total sound barrier that promptly draws the double sound source pattern inserts the loss calculated value; Concrete employing pattern is:
In the formula: R
AlwaysFor high speed railway sound barrier totally inserts loss,
R
DownBe the insertion loss of sound barrier to the bottom equivalent source.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335709A (en) * | 2013-06-26 | 2013-10-02 | 中山大学 | Outdoor measuring method for sound barrier transition area diffraction attenuation based on directional sound source |
| CN104834780A (en) * | 2015-05-05 | 2015-08-12 | 铁道第三勘察设计院集团有限公司 | High-speed railway sound barrier insertion loss prediction method of five-sound-source mode |
| CN106153185A (en) * | 2016-06-15 | 2016-11-23 | 铁道第三勘察设计院集团有限公司 | Source Spectrum computational methods are divided in high-speed railway noise source |
| CN108842642A (en) * | 2018-06-13 | 2018-11-20 | 中山大学 | A kind of road traffic noise decay calculation method for the sound barrier that frequency is equivalent |
| CN112580136A (en) * | 2020-12-16 | 2021-03-30 | 杭州京杭运河二通道建设投资有限公司 | Noise reduction optimization arrangement method for T-beam precast field |
| CN112782282A (en) * | 2020-12-25 | 2021-05-11 | 合肥市清大创新研究院有限公司 | Quick measuring device for insertion loss of active noise reduction foamed aluminum sound barrier |
| CN113935103A (en) * | 2021-12-17 | 2022-01-14 | 中国铁路设计集团有限公司 | Method for dynamically predicting insertion loss of high-iron-based sound source and sound barrier with limited long line |
| CN114357730A (en) * | 2021-12-16 | 2022-04-15 | 武汉理工大学 | Sound barrier optimization design system and method for reducing transformer substation noise |
| CN117852154A (en) * | 2024-03-04 | 2024-04-09 | 中国铁路设计集团有限公司 | Acoustic design method of pressure relief type sound barrier applied to high-speed railway and application of acoustic design method |
| CN118094089A (en) * | 2024-04-22 | 2024-05-28 | 泰豪科技股份有限公司 | Noise calculation method and system for container type diesel generator set |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335709B (en) * | 2013-06-26 | 2014-12-17 | 中山大学 | Outdoor measuring method for sound barrier transition area diffraction attenuation based on directional sound source |
| CN103335709A (en) * | 2013-06-26 | 2013-10-02 | 中山大学 | Outdoor measuring method for sound barrier transition area diffraction attenuation based on directional sound source |
| CN104834780A (en) * | 2015-05-05 | 2015-08-12 | 铁道第三勘察设计院集团有限公司 | High-speed railway sound barrier insertion loss prediction method of five-sound-source mode |
| CN104834780B (en) * | 2015-05-05 | 2018-01-09 | 中国铁路设计集团有限公司 | A kind of high speed railway sound barrier insertion loss Forecasting Methodology of five-sound source pattern |
| CN106153185A (en) * | 2016-06-15 | 2016-11-23 | 铁道第三勘察设计院集团有限公司 | Source Spectrum computational methods are divided in high-speed railway noise source |
| CN108842642A (en) * | 2018-06-13 | 2018-11-20 | 中山大学 | A kind of road traffic noise decay calculation method for the sound barrier that frequency is equivalent |
| CN112580136B (en) * | 2020-12-16 | 2023-08-08 | 杭州京杭运河二通道建设投资有限公司 | Noise reduction optimization arrangement method for T beam prefabricated field |
| CN112580136A (en) * | 2020-12-16 | 2021-03-30 | 杭州京杭运河二通道建设投资有限公司 | Noise reduction optimization arrangement method for T-beam precast field |
| CN112782282A (en) * | 2020-12-25 | 2021-05-11 | 合肥市清大创新研究院有限公司 | Quick measuring device for insertion loss of active noise reduction foamed aluminum sound barrier |
| CN114357730B (en) * | 2021-12-16 | 2024-08-13 | 武汉理工大学 | Sound barrier optimization design system and method for reducing noise of transformer substation |
| CN114357730A (en) * | 2021-12-16 | 2022-04-15 | 武汉理工大学 | Sound barrier optimization design system and method for reducing transformer substation noise |
| CN113935103A (en) * | 2021-12-17 | 2022-01-14 | 中国铁路设计集团有限公司 | Method for dynamically predicting insertion loss of high-iron-based sound source and sound barrier with limited long line |
| CN113935103B (en) * | 2021-12-17 | 2022-03-18 | 中国铁路设计集团有限公司 | Method for dynamically predicting insertion loss of high-iron-based sound source and sound barrier with limited long line |
| CN117852154A (en) * | 2024-03-04 | 2024-04-09 | 中国铁路设计集团有限公司 | Acoustic design method of pressure relief type sound barrier applied to high-speed railway and application of acoustic design method |
| CN117852154B (en) * | 2024-03-04 | 2024-06-11 | 中国铁路设计集团有限公司 | Acoustic design method of pressure relief type sound barrier applied to high-speed railway and application of acoustic design method |
| CN118094089A (en) * | 2024-04-22 | 2024-05-28 | 泰豪科技股份有限公司 | Noise calculation method and system for container type diesel generator set |
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Address after: 300142 Hebei District, Zhongshan Road, No. 10, Patentee after: China Railway Design Group Limited Address before: 300142 Hebei District, Zhongshan Road, No. 10, Patentee before: China Railway Third Survey and Design Institute Group Ltd. |
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