CN108842642A - A kind of road traffic noise decay calculation method for the sound barrier that frequency is equivalent - Google Patents
A kind of road traffic noise decay calculation method for the sound barrier that frequency is equivalent Download PDFInfo
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- CN108842642A CN108842642A CN201810607918.0A CN201810607918A CN108842642A CN 108842642 A CN108842642 A CN 108842642A CN 201810607918 A CN201810607918 A CN 201810607918A CN 108842642 A CN108842642 A CN 108842642A
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- 238000004364 calculation method Methods 0.000 title claims abstract description 39
- 238000005259 measurement Methods 0.000 claims abstract description 12
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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
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Abstract
The invention proposes a kind of road traffic noise decay calculation method of sound barrier that frequency is equivalent, this method, which passes through measurement first or calculates, obtains road traffic noise octave data；Then a sound path difference sequence is chosenWith a frequency sequence, which is known as scale frequency, and calculates the road traffic noise attenuation under each path difference sequential element and each frequency sequence element；Then the centre frequency in road traffic noise octave data is calculatedWith the road traffic noise attenuation under each path difference sequential element, calculate the overall attenuation under each path difference sequential element；Finally calculateWithDifference, and finding out makes the difference reach the smallest frequency values, the frequency valuesFrequency values as of equal value.
Description
Technical field
The present invention relates in road traffic noise calculating field, more particularly to a kind of sound barrier that frequency is equivalent
Road traffic noise decay calculation method.
Background technique
Road traffic noise is the main source of city noise pollution.Establishing sound barrier is to reduce road traffic noise to road
One of the important measures that road neighboring area influences.Need to precalculate the noise reduction effect of sound barrier before establishing sound barrier, with
Determine the height and material selection of sound barrier.In addition, needing comparison that sound barrier noise reduction is not carried out in Noise map application process
With implement sound barrier noise reduction latter two situation difference, calculating the difference using actual measurement mode is clearly a kind of cost
High, low efficiency method.Therefore, it is necessary to it is a kind of sound barrier effect under road traffic noise decay calculation method come solve with
Upper problem.
Currently, commonly the road traffic noise decay calculation method under sound barrier effect only considered path difference one
Factor, and path difference of the attenuation factor of noise not only between noise source and noise Rx point is related, and with noise source
Frequency is related.For this purpose, have scholar by the frequency of noise source be incorporated in sound barrier effect under road traffic noise decay calculation because
In element, the sound pressure level attenuation of each centre frequency of road traffic noise by calculating certain vehicle or certain wagon flow obtains road
The overall attenuation of road traffic noise sound pressure level.
But this method needs to obtain certain vehicle or the octave data of certain wagon flow, and needs to calculate each
The corresponding attenuation of centre frequency, calculation process is cumbersome, is not suitable for engineer application.Therefore, the present invention proposes that a kind of frequency is equivalent
Sound barrier road traffic noise decay calculation method, that is, calculate the equivalence of certain vehicle or certain wagon flow road traffic noise
Frequency, attenuating of the road traffic noise of vehicle or wagon flow of the same race under sound barrier effect can directly be counted with frequency of equal value
It calculates, simplifies the calculation process of attenuating.
Summary of the invention
Present invention aims at the road traffic noise decay calculations under the influence of simplified sound barrier, and it is equivalent to provide a kind of frequency
Sound barrier road traffic noise decay calculation method, the equivalent frequency of road traffic noise is obtained, for simplifying sound barrier
Act on the calculating of lower sound pressure level insertion loss.
In order to solve the above technical problems, the technical solution adopted by the present invention is that：
A kind of road traffic noise decay calculation method for the sound barrier that frequency is equivalent, comprises the steps of：
(a) the road traffic noise octave data of certain vehicle or wagon flow are obtained by measurement；
(b) a sound path difference sequence is chosenWith a frequency sequence, which is known as scale frequency,
And calculate the road traffic noise attenuation under each path difference sequential element and each frequency sequence element；
(c) the centre frequency sequence in road traffic noise octave data is calculatedUnder each path difference sequential element
Road traffic noise attenuation, calculate the overall attenuation under each path difference sequential element；
(d) it calculatesWithDifference, and finding out makes the difference reach the smallest frequency values, the frequency
ValueFrequency values as of equal value, the noise attenuation under sound barrier effect is directly calculated using frequency values of equal value.
Preferably, the sum of sound pressure level attenuation of each centre frequency of road traffic noise under the influence of sound barrier equivalence
In road traffic noise, sound pressure level attenuation, method core are to calculate the equivalence frequency under some frequency of equal value.
Preferably, in the step (a), road traffic noise octave data can be any one octave, often
With third-octave data.
Preferably, in the step (b), sound path difference sequenceIt is an one-dimensional vector, its elementBy from small to large
Arrangement, element number determine the computational accuracy and efficiency of frequency values of equal value.
Preferably, in the step (b), scale frequency sequenceIt is an one-dimensional vector, its elementBy from
Small to arrive longer spread, element number determines the computational accuracy and efficiency of frequency values of equal value, it is generally the case that scale frequency sequence
There are two types of common value modes：1）Using the centre frequency of third-octave as scale frequency sequence；2）It is 1Hz's with resolution ratio
Increasing sequence is as scale frequency sequence.
Preferably, in the step (b), the road under each path difference sequential element and each frequency sequence element is handed over
Logical noise attenuationCalculation formula be：
In formulaFor the velocity of sound, value 340m/s.
Preferably, in the step (c), the centre frequency sequence of sound octave dataAccording to the octave of selection
It determines.
Preferably, in the step (c), in the centre frequency sequence of road traffic noise octave dataWith it is every
Road traffic noise attenuation under a path difference sequential elementCalculation formula be：
In formulaFor the velocity of sound, value 340m/s.
Preferably, the overall attenuation in the step (c), under each path difference sequential elementCalculation formula
It is as follows：
In formulaIt is the corresponding sound pressure level of centre frequency that measurement obtains road traffic noise octave data；It is that measurement obtains
The overall sound pressure level of road traffic noise octave data；It is the corresponding acoustic pressure of each centre frequency after sound attenuating
Grade；It is the overall sound pressure level after sound attenuating；It is the overall attenuation under each path difference sequential element.
Preferably, in the step (d),WithThe calculation formula of difference be：
In formulaFor sound path difference sequenceElement number.
Preferably, in the step (d), frequency values of equal valueCalculation formula be：
Even if difference reaches the smallest frequency values。
Preferably, in the step (d), vehicle or wagon flow of the same race is directly calculated using frequency values of equal value and is made in sound barrier
The calculation formula of noise attenuation under is：
In formulaIt is path difference,For the velocity of sound, value 340m/s.
Compared with prior art, the present invention has the following advantages that：
The present invention proposes a kind of road traffic noise decay calculation method of sound barrier that frequency is equivalent.This method is in sound barrier
Under the influence of the sum of the sound pressure level attenuation of each centre frequency of road traffic noise be equivalent to road traffic noise in some frequency of equal value
Sound pressure level attenuation under rate.After calculating the frequency of equal value for obtaining certain vehicle or certain wagon flow, in engineer application, when
Need to calculate vehicle of the same race or wagon flow of the same race influenced by sound barrier after noise attenuation when, directly utilize frequency of equal value
Calculate noise attenuation, it is no longer necessary to pass through the sound pressure level of the octave data and each centre frequency of calculating of measurement vehicle or wagon flow
The mode of attenuation obtains noise attenuation, enormously simplifies sound barrier and acts on lower road traffic noise sound pressure level insertion loss
Calculation process.
Detailed description of the invention
Fig. 1 is flow diagram of the present invention.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, it should be understood that this place
The specific embodiment of description is used only for explaining the present invention, is not intended to limit the present invention.
As shown in Figure 1, the present invention provides a kind of road traffic noise decay calculation method of sound barrier that frequency is equivalent.It is logical
Cross following steps realization：
Step 1：Obtain the road traffic noise octave data of certain vehicle or wagon flow by measurement, which can be with
It is any one octave, commonly uses third-octave data.
Step 2：Choose a sound path difference sequenceWith a frequency sequence, which is known as scale frequency, and
Calculate the road traffic noise attenuation under each path difference sequential element and each frequency sequence element.Sound
Path difference sequenceWith scale frequency sequenceIt is all increasing sequence, element number determines the computational accuracy and effect of frequency values of equal value
Rate, the road traffic noise attenuation under each path difference sequential element and each frequency sequence elementMeter
Calculating formula is：
In formulaIt is scale frequency sequenceElement；It is sound path difference sequenceElement；For the velocity of sound, value 340m/s.
Step 3：Calculate the centre frequency sequence in road traffic noise octave dataWith each path difference sequent
Road traffic noise attenuation under element, calculate the overall attenuation under each path difference sequential element.Meter
It is as follows to calculate formula：
In formulaIt is centre frequency sequenceElement；For the velocity of sound, value 340m/s；It is that measurement obtains road traffic
The corresponding sound pressure level of centre frequency of noise octave data；It is total sound that measurement obtains road traffic noise octave data
It arbitrarily downgrades；It is the corresponding sound pressure level of each centre frequency after sound attenuating；It is total acoustic pressure after sound attenuating
Grade；It is the overall attenuation under each path difference sequential element.
Step 4：It calculatesWithDifference, and finding out makes the difference reach the smallest frequency values,
Calculation formula is as follows：
In formulaFor sound path difference sequenceElement number；Make differenceReach the smallest frequency valuesIt is frequency of equal value
Rate。
Step 5：Utilize frequency of equal valueDirectly calculate the noise attenuation of vehicle or wagon flow of the same race under sound barrier effect.
The embodiment of invention described above, is not intended to limit the scope of the present invention..It is any in this hair
Made modifications, equivalent substitutions and improvements etc. within bright spiritual principles should be included in claim protection of the invention
Within the scope of.
Claims (10)
1. a kind of road traffic noise decay calculation method of sound barrier that frequency is equivalent, which is characterized in that specific calculating process
For：
S1：The road traffic noise octave data of certain vehicle or wagon flow are obtained by measurement；
S2：Choose a sound path difference sequenceWith a frequency sequence, which is known as scale frequency, and calculates every
Road traffic noise attenuation under a path difference sequential element and each frequency sequence element；
S3：Calculate the centre frequency sequence in road traffic noise octave dataWith the road under each path difference sequential element
Road weakening traffic noise amount, calculate the overall attenuation under each path difference sequential element；
S4：It calculatesWithDifference, and finding out makes the difference reach the smallest frequency values, the frequency
ValueFrequency values as of equal value directly calculate the noise of vehicle or wagon flow of the same race under sound barrier effect using frequency values of equal value
Attenuation.
2. the road traffic noise decay calculation method of the equivalent sound barrier of frequency according to claim 1, feature exist
In, under the influence of sound barrier the sum of the sound pressure level attenuation of each centre frequency of road traffic noise be equivalent to road traffic noise
The sound pressure level attenuation under some frequency of equal value, method core are to calculate the equivalence frequency.
3. the road traffic noise decay calculation method of the equivalent sound barrier of frequency according to claim 2, feature exist
In in the step S1, the road traffic noise octave data of certain vehicle or wagon flow can be any one octave, often
With third-octave data.
4. the road traffic noise decay calculation method of the equivalent sound barrier of frequency according to claim 3, feature exist
In, in the step S2, sound path difference sequenceIt is an one-dimensional vector, its elementBy arranging from small to large, element number is determined
The computational accuracy and efficiency of fixed equivalence frequency values.
5. the road traffic noise decay calculation method of the equivalent sound barrier of frequency according to claim 4, feature exist
In, in the step S2, scale frequency sequenceIt is an one-dimensional vector, its elementBy arranging from small to large, element
Number determines the computational accuracy and efficiency of frequency values of equal value, it is generally the case that scale frequency sequenceCommon value mode has two
Kind：1）Using the centre frequency of third-octave as scale frequency sequence；2）Using resolution ratio for 1Hz increasing sequence as scale
Frequency sequence.
6. the road traffic noise decay calculation method of the equivalent sound barrier of frequency according to claim 5,
It is characterized in that, the road traffic in the step S2, under each path difference sequential element and each frequency sequence element
Noise attenuationCalculation formula be：
In formulaFor the velocity of sound, value 340m/s.
7. the road traffic noise decay calculation method of the equivalent sound barrier of frequency according to claim 6, feature exist
In in the step S3, in the centre frequency sequence of road traffic noise octave dataWith each path difference sequential element
Under road traffic noise attenuationCalculation formula be：
In formulaFor the velocity of sound, value 340m/s.
8. the road traffic noise decay calculation method of the equivalent sound barrier of frequency according to claim 7, feature exist
In overall attenuation in the step S3, under each path difference sequential elementCalculation formula it is as follows：
In formulaIt is the corresponding sound pressure level of centre frequency that measurement obtains road traffic noise octave data；It is that measurement obtains
The overall sound pressure level of road traffic noise octave data；It is the corresponding acoustic pressure of each centre frequency after sound attenuating
Grade；It is the overall sound pressure level after sound attenuating；It is the overall attenuation under each path difference sequential element.
9. the road traffic noise decay calculation method of the equivalent sound barrier of frequency according to claim 8, feature exist
In, in the step S4,WithThe calculation formula of difference be：
In formulaFor sound path difference sequenceElement number.
10. the road traffic noise decay calculation method of the equivalent sound barrier of frequency according to claim 9, feature exist
In, in the step S4, frequency values of equal valueCalculation formula be：
Even if difference reaches the smallest frequency values；
The calculation formula of the noise attenuation of vehicle or wagon flow of the same race under sound barrier effect is directly calculated using frequency values of equal value
For：
In formulaIt is path difference,For the velocity of sound, value 340m/s.
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Cited By (1)
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| CN109668960A (en) * | 2018-11-23 | 2019-04-23 | 中山大学 | A kind of point sound source house group decay calculation method |
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| CN109668960A (en) * | 2018-11-23 | 2019-04-23 | 中山大学 | A kind of point sound source house group decay calculation method |
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