CN102749136A - Method for determining noise equivalent frequency of motor vehicle - Google Patents
Method for determining noise equivalent frequency of motor vehicle Download PDFInfo
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- CN102749136A CN102749136A CN2012102047450A CN201210204745A CN102749136A CN 102749136 A CN102749136 A CN 102749136A CN 2012102047450 A CN2012102047450 A CN 2012102047450A CN 201210204745 A CN201210204745 A CN 201210204745A CN 102749136 A CN102749136 A CN 102749136A
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Abstract
The invention provides a method for determining the noise equivalent frequency of a motor vehicle, which is suitable for different travel speeds and different vehicle types, has simple calculation and high precision, and is used for accurately calculating the insertion loss of a sound barrier. The method for determining the noise equivalent frequency of the motor vehicle comprises the following steps of: step 1, acquiring the noise sample data of the vehicle, including 1/3 octave sound pressure level of a single vehicle, the vehicle type and the travel speed; step 2, using a method of Appendix B of Norm on Acoustical Design and Measurement of Noise Barriers to calculate the noise equivalent frequency; and step 3, analyzing a great number of sample data in a statistical manner according to different vehicle type intervals and different travel speed intervals, and determining the noise equivalent frequency which has the maximum probability of occurrence.
Description
Technical field
The invention belongs to road traffic and technical field of environment protection, particularly relate to the mensuration of motor vehicle noise.
Background technology
Along with the continuous propelling of Urbanization in China, the city noise pollution problem also becomes increasingly conspicuous, the normal daily life system of serious harm people, and caused people's extensive concern.According to State Statistics Bureau's statistics in 2009, the acoustic energy ratio that the traffic noise of China's main cities, man-made noise, building noise and noise of social activities account for all noises is respectively: 38.6%, 19.6%, 25.7% and 16.1%.This shows that traffic noise is the principal ingredient of urban environment noise, how traffic noise being carried out effectively preventing has significance to improving urban environment noise.
It is one of important means of control traffic noise that sound barrier is set.When the sound wave of noise runs into sound barrier, it will be propagated along three paths: a part is crossed the diffraction arrival of sound barrier top and is received point; A part is passed through sound barrier arrival and is received point; A part produces reflection on the sound barrier wall.Insert the poor of acceptance point sound pressure level that loss is meant sound barrier and no sound barrier.Can find out from definition that inserting loss is the amount of taking all factors into consideration, it has comprised the influence of diffraction, reflection, transmission.The insertion of sound barrier loss depends primarily on the acoustic energy that sound wave that sound source sends propagates along this three paths and distributes.Wherein, the decay of the diffraction of sound barrier is that the decision sound barrier inserts the Main physical amount of loss.
The frequency characteristic of traffic noise is one of most important parameter during the diffraction of sound barrier is decayed.Because the energy of traffic noise mainly concentrates on the frequency range of 20Hz ~ 20KHz, the frequency band broad for simplifying computing, generally adopts the equivalent frequency of sound source.In " sound barrier inserts loss to the A weighted sound of traffic noise " literary composition, through analyzing the average frequency spectrum of continuous wagon flow, the traffic noise that proposes China should use the equivalent frequency of 400Hz as far back as domestic scholars Zhang Li in 1989 etc.And abroad, the late 1980s U.S. famous scholar Harris C.M proposes can use traffic noise the equivalent noise of 500Hz in works " Handbook of Noise Control ".Based on this, China's road traffic noise begins to continue to use the equivalent frequency of 500Hz, issues in " sound barrier acoustics design and specifications of surveys " in 2004, also recommends to use the equivalent frequency of 500Hz.
Yet; Along with expanding economy; Very big variation has taken place in the specification of motor vehicle and speed; Adopt the equivalent frequency of 500Hz can not accurately reflect the sound barrier diffraction decay of traffic noise, and adopt single equivalent frequency also can't reflect the noise frequency characteristic of all types of vehicles under the different speed of a motor vehicle.
Summary of the invention
The present invention provides a kind of assay method different speed of a motor vehicle different automobile types, that calculate the motor vehicle noise equivalent frequency simple, that accuracy is high that is applicable to, is used for the insertion loss of accurate Calculation sound barrier.
For solving the problems of the technologies described above, the present invention provides a kind of assay method of motor vehicle noise equivalent frequency, may further comprise the steps:
Step 1: collection vehicle noise sample data comprise third-octave sound pressure level, vehicle and the speed of a motor vehicle of single vehicle;
Step 2: the method with " sound barrier acoustics design and specifications of surveys " appendix B calculates the noise equivalent frequency;
Step 3: the great amount of samples data are carried out statistical study by different automobile types friction speed interval, confirm the noise equivalent frequency that probability of occurrence is the highest.
Further, said method also comprises
:Step 4: the correspondence table of setting up different automobile types friction speed interval and noise equivalent frequency.
Further, in the said step 1, in 50 meters other vehicles must not be arranged before and after the vehicle to be detected.
Further, in the said step 1, sampled point is 1.2 meters apart from 7.5 meters of first lane center lines apart from floor level.
Further, the vehicle in the said step 1 is divided into compact car, in-between car and large car.More than the large car deadweight 12t, in-between car deadweight 3.5t ~ 12t is below the compact car deadweight 3.5t.
Further, said speed interval is meant that the interval with 10km/h is divided into toy vehicle velocity value between several region, and it is 6 intervals that the compact car speed of a motor vehicle is divided into from 30km/h to 90km/h, and it is 4 intervals that medium-and-large-sized car is divided into from 30km/h to 70km/h.
Through measuring the noise spectrum of single vehicle; Calculate the noise equivalent frequency of each car; Obtain the corresponding noise equivalent frequency of every kind of vehicle under each speed interval through reductive analysis, thereby set up corresponding relation based on all types of motor vehicle noise equivalent frequencies of the different speed of a motor vehicle.The vehicle-state parameter of calculating as required; Comprise the vehicle and the speed of a motor vehicle; Corresponding with type of vehicle and speed interval in the corresponding relation, can obtain corresponding noise equivalent frequency, because these computing method have taken into full account the influence to the noise equivalent frequency of vehicle and speed; Help to improve sound barrier and insert the degree of accuracy that loss is calculated, for the design sound barrier is prepared.
Embodiment
According to embodiment invention is further specified below:
The present invention is according to the relevant regulations of " automobile give it the gun pass-by noise limit value and measuring method GB1495-2002 ", and for avoiding the interference of unnecessary factor, selected sampling highway section should be away from crossing, river and crowded area.The object of sample detecting is the single vehicle noise spectrum, should get rid of the noise phase mutual interference between vehicle, in 50 meters the distance other driving vehicles can not be arranged before and after the vehicle of sample detecting.
Sampled point is apart from 7.5 meters of first lane center lines, and is liftoff high 1.2 meters, when the vehicle distances sampled point that goes is nearest, promptly notes the third-octave sound pressure level of this time with sound meter, the registration of vehicle type, and use knotmeter to measure the speed of a motor vehicle of this vehicle.
Through using the method for " sound barrier acoustics design and specifications of surveys " appendix B to calculate equivalent frequency to vehicle third-octave noise sound
f e, can carry out statistical study after the data acquisition of large sample amount, vehicle noise equivalent frequency probability of occurrence is the highest under a certain velocity shooting of a certain vehicle is the noise equivalent frequency of this vehicle under this velocity shooting.
Said " sound barrier acoustics design and specifications of surveys " appendix B equivalent frequency computing method are as follows:
1, confirms path difference
δSpan be 0.01-10m;
2, receive some place road traffic noise third-octave sound control, A weighted octave band level when calculating should the place no barrier according to actual measurement
LWith total A-weighted sound level
L
3, calculate by noise sound barrier diffraction decay formula and receive the diffraction acoustic attenuation Δ of each frequency band of some place after sound barrier is arranged
L
4, calculate the A weighted octave band level that barrier is arranged
LWith A weighted overall level
L
5, calculate total diffraction acoustic attenuation Δ
L
6, with Δ
LΔ with each frequency band
LCompare, the corresponding mid-band frequency of minimal difference is equivalent frequency.
The computing formula of equivalent frequency is: Δ
f e=
Wherein minimum value is equivalent frequency
f E,In the formula:
δ=0.01,0.1,0.5,1,2.5,5,10 totally 7,
f=315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1000Hz, 1250Hz
Said noise sound barrier diffraction decay formula is as follows:
Through to the sample data reductive analysis, set up the corresponding relation of vehicle vehicle, the speed of a motor vehicle and noise equivalent frequency, as shown in table 1:
Motor vehicle noise equivalent frequency corresponding relation under the different transport conditions of table 1
Speed subitem shown in the table 1, as 30-40km/h be meant car speed [30,40) in the km/h scope.
Through above-mentioned corresponding relation, just can calculate corresponding noise equivalent frequency according to state parameter.
This method is applicable to the noise equivalent frequency computation part that friction speed is interval; In sample; Compact car speed focuses mostly at 30-90km/h, and medium-sized, the large car speed of a motor vehicle focuses mostly at 30-70km/h, so this paper only provides the noise equivalent frequency values of these speed intervals.
Claims (7)
1. the assay method of a motor vehicle noise equivalent frequency is characterized in that, may further comprise the steps:
Step 1: collection vehicle noise sample data comprise third-octave sound pressure level, vehicle and the speed of a motor vehicle of single vehicle;
Step 2: the method with " sound barrier acoustics design and specifications of surveys " appendix B calculates the noise equivalent frequency;
Step 3: the great amount of samples data are carried out statistical study by different automobile types friction speed interval, confirm the noise equivalent frequency that probability of occurrence is the highest.
2. detection method according to claim 1 is characterized in that said method also comprises
:Step 4: the correspondence table of setting up different automobile types friction speed interval and noise equivalent frequency.
3. detection method according to claim 1 and 2 is characterized in that, in the said step 1, in 50 meters other vehicles must not be arranged before and after the vehicle to be detected.
4. detection method according to claim 1 and 2 is characterized in that, in the said step 1, sampled point is 1.2 meters apart from 7.5 meters of first lane center lines apart from floor level.
5. detection method according to claim 1 and 2 is characterized in that the vehicle in the said step 1 is divided into compact car, in-between car and large car.
6. detection method according to claim 5 is characterized in that, more than the said large car deadweight 12t, in-between car deadweight 3.5t ~ 12t is below the compact car deadweight 3.5t.
7. detection method according to claim 1 and 2; It is characterized in that; Said speed interval is meant that the interval with 10km/h is divided into toy vehicle velocity value between several region; It is 6 intervals that the compact car speed of a motor vehicle is divided into from 30km/h to 90km/h, and it is 4 intervals that medium-and-large-sized car is divided into from 30km/h to 70km/h.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103473932A (en) * | 2013-09-06 | 2013-12-25 | 中山大学 | Sound signal vehicle type identification system combined with oscillation mark line |
| CN103994892A (en) * | 2014-05-05 | 2014-08-20 | 中国汽车技术研究中心 | Test system for vehicle acoustical power and test method thereof |
| 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 |
| CN108896665A (en) * | 2018-08-27 | 2018-11-27 | 国网山东省电力公司电力科学研究院 | The applicability appraisal procedure of workplace noiseproof earplug |
| CN114441183A (en) * | 2020-11-03 | 2022-05-06 | 陕西汽车集团有限责任公司 | Method for detecting noise transmission path in vehicle |
| CN114441183B (en) * | 2020-11-03 | 2024-04-26 | 陕西汽车集团股份有限公司 | Method for detecting noise transmission path in vehicle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101515302A (en) * | 2008-05-16 | 2009-08-26 | 上海船舶运输科学研究所 | Acoustic design method for road noise barrier |
| US20090243890A1 (en) * | 2008-03-28 | 2009-10-01 | Institute Of Transportation, Motc | Multi-lane vehicle detection apparatus |
| CN101697175A (en) * | 2009-10-26 | 2010-04-21 | 华东交通大学 | Simulated prediction method for rail transit noise |
-
2012
- 2012-06-20 CN CN2012102047450A patent/CN102749136A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090243890A1 (en) * | 2008-03-28 | 2009-10-01 | Institute Of Transportation, Motc | Multi-lane vehicle detection apparatus |
| CN101515302A (en) * | 2008-05-16 | 2009-08-26 | 上海船舶运输科学研究所 | Acoustic design method for road noise barrier |
| CN101697175A (en) * | 2009-10-26 | 2010-04-21 | 华东交通大学 | Simulated prediction method for rail transit noise |
Non-Patent Citations (3)
| Title |
|---|
| 赵剑强等: "公路交通噪声源强测试", 《公路交通科技》 * |
| 邵钢等: "道路交通噪声等效频率的研究", 《声学技术》 * |
| 龚凯等: "客运列车声屏障的等效频率试验研究", 《噪声与振动控制》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103473932A (en) * | 2013-09-06 | 2013-12-25 | 中山大学 | Sound signal vehicle type identification system combined with oscillation mark line |
| CN103473932B (en) * | 2013-09-06 | 2016-01-20 | 中山大学 | A kind of sound signal model recognition system of combination vibration graticule |
| CN103994892A (en) * | 2014-05-05 | 2014-08-20 | 中国汽车技术研究中心 | Test system for vehicle acoustical power and test method thereof |
| CN103994892B (en) * | 2014-05-05 | 2017-02-15 | 中国汽车技术研究中心 | Test system for vehicle acoustical power and test method thereof |
| 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 |
| CN108896665A (en) * | 2018-08-27 | 2018-11-27 | 国网山东省电力公司电力科学研究院 | The applicability appraisal procedure of workplace noiseproof earplug |
| CN114441183A (en) * | 2020-11-03 | 2022-05-06 | 陕西汽车集团有限责任公司 | Method for detecting noise transmission path in vehicle |
| CN114441183B (en) * | 2020-11-03 | 2024-04-26 | 陕西汽车集团股份有限公司 | Method for detecting noise transmission path in vehicle |
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Application publication date: 20121024 |