CN104359548A - Indoor noise detection method - Google Patents
Indoor noise detection method Download PDFInfo
- Publication number
- CN104359548A CN104359548A CN201410183384.5A CN201410183384A CN104359548A CN 104359548 A CN104359548 A CN 104359548A CN 201410183384 A CN201410183384 A CN 201410183384A CN 104359548 A CN104359548 A CN 104359548A
- Authority
- CN
- China
- Prior art keywords
- noise
- indoor
- sound
- equipment
- vibration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
An indoor noise detection method includes: respectively determining indoor noises in different environments through a series of operation, then, calculating background noises and air sound generated by equipment vibration and solid-borne sound according to a specific method, analyzing on the basis of the three parameters, calculating to obtain sound pressure of the indoor noises, and classifying the indoor noises and subjecting the indoor noises to targeted reduction according to the sound pressure. The indoor noise detection method has the advantages that according to the method, some basic parameters are detected, and the effective sound pressure of the indoor noises is obtained by calculation according to formulas, so that classification of the indoor noises is achieved; main sources of the indoor noises can be analyzed through detection, so that the indoor noises can be subjected to targeted reduction and even can be reduced or eliminated.
Description
Technical field
The present invention relates to the walkaway analysis field in building field, specifically a kind of detection method of room noise.
Background technology
For laying vibratory equipment in buildings (as water pump; transformer; cooling tower; air conditioner etc.); vibration just outwards may be propagated along building structural element, and to indoor discharge (radiation) the low frequency solid borne noise in periphery room, this is a great problem that noise disturbs residents in problem; often can cause civil disputation, should enough attention be caused.
The main cause that noise occurs is caused by object vibration, the structural system of buildings propagates the noise vibrating and cause, or the noise to be produced by bearing carrier itself vibrates belongs to solid borne noise category, structural elements comprises reinforced beam, plate, post and reinforced concrete shear wall etc., the frequency range of solid borne noise mainly concentrates on the interval of octave center frequency 31.5Hz ~ 500Hz, frequency coverage is 22Hz ~ 707Hz, belongs to low-frequency noise.
Along with the raising of people's living standard, the vibration noise problem of covil construction highlights gradually.In engineering reality, common phenomenon is that vibratory equipment is arranged on flooring or roofing, and the vibration passing of equipment is in building structure.Vibration has structural elements, and beam, plate, post, wall etc. are propagated to neighboring buildings, and periphery house is vibrated.To indoor discharge (radiation) low frequency solid borne noise.In house and office class building, such vibration noise can affect normal routine life and the working environment of people.Now, in the house adjacent with equipment room, noise can be divided into: ground unrest, the air-borne sound that vibration equipment produces and solid-borne noise.Room noise is the result of this three superposition.
Summary of the invention
Cannot detect room noise thus the very difficult problem that room noise is graded for solving in prior art, the invention provides a kind of detection method of room noise, can be detected the noise of indoor by this method, and analytical calculation, thus provide theoretical foundation for eliminating and reducing noise.
The present invention is the technical scheme solving the problems of the technologies described above employing: a kind of detection method of room noise, comprises the following steps:
1) airborne noise that the ground unrest in difference sensing chamber, vibration equipment produce and solid borne noise, detection method is:
First, vibratory equipment runs, and test room noise also records this noise figure;
Now, room noise be ground unrest, the superposition of solid borne noise that causes of facilities air noise and equipment;
Secondly, vibratory equipment stops, and test room noise also records this noise figure;
Now, room noise only has ground unrest, and does not have the solid borne noise that facilities air noise and equipment cause;
Finally, vibratory equipment vibration isolation, test room noise also records this noise figure;
Now, room noise is the superposition of ground unrest and facilities air noise, and equipment solid borne noise is isolated;
2) ground unrest be one quantitatively, that is, room noise is not change within a period of time, that is: L
p scape=C
scape;
The airborne noise that equipment produces and solid borne noise are respectively: L
p gaswith L
p is solid;
Equipment overall noise is: L
p establishes;
Indoor overall noise is: L
p room;
Indoor overall noise should be noise of equipment and the superposing of ground unrest, that is:
；
；
3) go out the solid borne noise by structure-borne by above-mentioned formulae discovery, and can regard indoor spot noise source as by the solid borne noise of structure-borne, indoor spot noise source in half space radiation acoustic pressure is:
；
Effective sound pressure:
Ball source sound surface vibration speed is:
In formula,
for wave number;
for vibration velocity, m/s;
for vibration circular frequency;
for distance, m;
for frequency, Hz;
imaginary unit;
air velocity of sound when being 20 degree, 344m/s;
for atmospheric density;
4) radiated sound field of the area source of sound S of indoor arbitrary shape can regard the combination of some point sound source dS as, and now, total space sound radiation pressure is:
；
5) indoor noise can regard that sound source is embedded in half space radiation on infinitely great baffle as, and the total acoustic pressure of radiation is now:
；
In formula,
for bin is to observation station distance,
for the initial phase of bin,
for the vibration velocity amplitude of bin, f is vibration frequency;
6) total acoustic pressure of indoor is regarded as the superposition of the sound wave that N number of amplitude is equal, phase place is random, now the effective value of acoustic pressure is:
Now, sound field and radiation direction have nothing to do, and namely to sound source non-directive, this acoustic pressure is the indoor total acoustic pressure of noise.
Beneficial effect: the present invention first detects some basic parameters by said method, then the effective sound pressure of room noise is obtained by formulae discovery, thus the classification achieved room noise, by above-mentioned detection, also the main source of room noise can be analyzed, thus targetedly it is cut down, thus reduce or decontamination chamber in noise.
Accompanying drawing explanation
Fig. 1 is that room noise propagates schematic diagram;
Fig. 2 is vibration of floor modal graph in embodiment;
Fig. 3 is floor reference mark vibration acceleration response figure in embodiment;
Fig. 4 is the radiation pattern of point sound source.
Embodiment
Below in conjunction with specific embodiment, the present invention is further elaborated.
In engineering reality, common phenomenon is that vibratory equipment is arranged on flooring or roofing, and the vibration passing of equipment is in building structure.Vibration has structural elements, and beam, plate, post, wall etc. are propagated to neighboring buildings, and periphery house is vibrated.To indoor discharge (radiation) low frequency solid borne noise.In house and office class building, such vibration noise can affect normal routine life and the working environment of people.Now, in the house adjacent with equipment room, noise can be divided into: ground unrest, the air-borne sound that vibration equipment produces and solid-borne noise.Room noise is the result of this three superposition.Its noise transmission process as shown in Figure 1.
For the noise analysis of many sound sources, can use noise superposition principle, namely two or more individual sources acts on certain a bit, and the superposition producing noise can according to formulae discovery below.
Sound pressure level after noise superposition is:
(formula 1)
(formula 2)
In formula, the indoor overall sound pressure level of Lp--, dB;
The sound pressure level of Lp1--sound source 1, dB;
The sound pressure level of Lp2--sound source 2, dB.
In order to analytical equipment produce airborne noise and solid borne noise, that is and ground unrest between relation, noise testing can be carried out according to following steps.
The first step: vibratory equipment runs, test room noise.Now, room noise is ground unrest, the superposition of the solid borne noise that facilities air noise and equipment cause.
Second step: vibratory equipment stops, test room noise.Now, room noise only has ground unrest, and does not have the solid borne noise that facilities air noise and equipment cause.
3rd step: vibratory equipment vibration isolation, test room noise.Now, room noise is the superposition of ground unrest and facilities air noise, and equipment solid borne noise is isolated.
If in residential block test, for steady-state vibration source, the test duration at night, should carry out time ground unrest harmony field wave moves less, the desirable 10s of test duration length, and testing time is 3 times.When 3 test results and the ratio of mean value, when error is within 5%, using its mean value as test result.Test data comprises A weighted equivalent sound pressure level and octave sound pressure level etc.
If in certain room of a buildings, ground unrest be one quantitatively, that is, room noise is not change within a period of time.We suppose that room background noise is constant constant, that is: Lp scape=C scape.
The airborne noise that equipment produces and solid borne noise are respectively: Lp gas and Lp are admittedly.
Equipment overall noise is: Lp establishes; Indoor overall noise is: Lp room.
Indoor overall noise should be noise of equipment and the superposing of ground unrest, that is,
(formula 3)
(formula 4)
According to the several noise testing steps introduced, the noise data of different phase can be obtained above.When noise testing result is comparatively accurate, according to noise superposition calculation formula (formula 4 and formula 5), the solid borne noise of equipment by structure-borne just can be inferred.
(formula 5)
(formula 6)
Vibratory equipment is arranged on flooring, the solid borne noise problem transmitted by building structural element, needs to take vibration damping and vibration isolation measure to equipment, to reduce structural vibration, eliminates this part noise.
Its principle of work is, building structure is vibration system, vibratory equipment dynamic is disturbed the vibration input that masterpiece is this system, is so vibration outgoing position, namely the vibratory response point of structural system to the vibration control point in the restricted room of noise.
If structural vibration is stable state, the mode superposition method analytical structure vibration characteristics of limited configurations meta software can be adopted, calculate vibratory response.(mode superposition method is conventional vibration analysis method, if need to introduce specially).
For acoustic environment vibration problem, be mainly reflected in the vibration of floor and wall member.Therefore vibration analysis can use Shell Finite Element to analyze.Accompanying drawing 2 is certain first order mode of floor, and accompanying drawing 3 is analyzing acceleration response results of vibration control point.
There is structural vibration analysis result, analyzed vibration acoustic radiation according to Principles of Acoustics.
First the radiation problem of point sound source is considered.In half space radiation acoustic pressure be:
；
Effective sound pressure:
;
Ball source sound surface vibration speed is:
;
In formula,
for wave number;
for vibration velocity, m/s;
for vibration circular frequency;
for distance, m;
for frequency, Hz;
imaginary unit;
air velocity of sound when being 20 degree, 344m/s;
for atmospheric density;
In the combination of consideration point sound source.The radiated sound field of arbitrary shape area source of sound can be determined in principle.If there is a sound source surface to be S, each point vibration source is even, and source, face dS can regard point sound source as.
Total space sound radiation pressure is:
If sound source is embedded in half space radiation on infinitely great baffle, then total acoustic pressure is:
for bin is to observation station distance;
for the initial phase of bin;
for the vibration velocity amplitude of bin; F is vibration frequency.
If the acoustic pressure of surperficial observation station is that N number of amplitude is equal, the superposition of the sound wave that phase place is random, the effective value of acoustic pressure is:
Now sound field and θ direction have nothing to do, i.e. this sound source non-directive.
Claims (1)
1. a detection method for room noise, is characterized in that, comprises the following steps:
1) airborne noise that the ground unrest in difference sensing chamber, vibration equipment produce and solid borne noise, detection method is:
First, vibratory equipment runs, and test room noise also records this noise figure;
Now, room noise be ground unrest, the superposition of solid borne noise that causes of facilities air noise and equipment;
Secondly, vibratory equipment stops, and test room noise also records this noise figure;
Now, room noise only has ground unrest, and does not have the solid borne noise that facilities air noise and equipment cause;
Finally, vibratory equipment vibration isolation, test room noise also records this noise figure;
Now, room noise is the superposition of ground unrest and facilities air noise, and equipment solid borne noise is isolated;
2) ground unrest be one quantitatively, that is, room noise is not change within a period of time, that is: L
p scape=C
scape;
The airborne noise that equipment produces and solid borne noise are respectively: L
p gaswith L
p is solid;
Equipment overall noise is: L
p establishes;
Indoor overall noise is: L
p room;
Indoor overall noise should be noise of equipment and the superposing of ground unrest, that is:
；
；
3) go out the solid borne noise by structure-borne by above-mentioned formulae discovery, and can regard indoor spot noise source as by the solid borne noise of structure-borne, indoor spot noise source in half space radiation acoustic pressure is:
；
Effective sound pressure:
;
Ball source sound surface vibration speed is:
;
In formula,
for wave number;
for vibration velocity, m/s;
for vibration circular frequency;
for distance, m;
for frequency, Hz;
imaginary unit;
air velocity of sound when being 20 degree, 344m/s;
for atmospheric density;
4) radiated sound field of the area source of sound S of indoor arbitrary shape can regard the combination of some point sound source dS as, and now, total space sound radiation pressure is:
；
5) indoor noise can regard that sound source is embedded in half space radiation on infinitely great baffle as, and the total acoustic pressure of radiation is now:
；
In formula,
for bin is to observation station distance,
for the initial phase of bin,
for the vibration velocity amplitude of bin, f is vibration frequency;
6) total acoustic pressure of indoor is regarded as the superposition of the sound wave that N number of amplitude is equal, phase place is random, now the effective value of acoustic pressure is:
Now, sound field and radiation direction have nothing to do, and namely to sound source non-directive, this acoustic pressure is the indoor total acoustic pressure of noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410183384.5A CN104359548A (en) | 2014-05-04 | 2014-05-04 | Indoor noise detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410183384.5A CN104359548A (en) | 2014-05-04 | 2014-05-04 | Indoor noise detection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104359548A true CN104359548A (en) | 2015-02-18 |
Family
ID=52526831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410183384.5A Pending CN104359548A (en) | 2014-05-04 | 2014-05-04 | Indoor noise detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104359548A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241545A (en) * | 2015-10-30 | 2016-01-13 | 李宗明 | Detection method and system of air-conditioning noises |
| WO2017000813A1 (en) * | 2015-06-30 | 2017-01-05 | 芋头科技（杭州）有限公司 | Indoor noise pollution automatic identification and monitoring system |
| CN107478323A (en) * | 2017-07-17 | 2017-12-15 | 芜湖泰领信息科技有限公司 | A kind of city noise monitoring method and system based on public bicycles |
| CN107563130A (en) * | 2017-08-03 | 2018-01-09 | 郑州云海信息技术有限公司 | A kind of method for estimating n group array fan noises |
| CN110031086A (en) * | 2018-01-05 | 2019-07-19 | 财团法人多次元智能It融合系统 | Interlayer noise measuring device and method and monitoring system |
| CN110715724A (en) * | 2019-08-12 | 2020-01-21 | 中国第一汽车股份有限公司 | Method for measuring and calculating noise in vehicle based on noise of rack and acoustic transmission function |
| US11557279B2 (en) | 2018-05-07 | 2023-01-17 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Device, method and computer program for acoustic monitoring of a monitoring area |
| CN117012231A (en) * | 2023-10-07 | 2023-11-07 | 中国铁路设计集团有限公司 | Method for identifying noise sources of adjacent rooms caused by indoor equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1699934A (en) * | 2005-04-13 | 2005-11-23 | 广州市环境监测中心站 | Method for measuring and evaluating room noise of civil architecture |
| CN103630232A (en) * | 2013-10-29 | 2014-03-12 | 南车青岛四方机车车辆股份有限公司 | Noise source identifying and testing method for high speed train |
-
2014
- 2014-05-04 CN CN201410183384.5A patent/CN104359548A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1699934A (en) * | 2005-04-13 | 2005-11-23 | 广州市环境监测中心站 | Method for measuring and evaluating room noise of civil architecture |
| CN103630232A (en) * | 2013-10-29 | 2014-03-12 | 南车青岛四方机车车辆股份有限公司 | Noise source identifying and testing method for high speed train |
Non-Patent Citations (2)
| Title |
|---|
| 林旗力: "固定设备结构传播室内噪声排放限值研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
| 袁旻忞等: "高速列车运行工况下噪声传递路径及声源贡献量分析", 《振动与冲击》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017000813A1 (en) * | 2015-06-30 | 2017-01-05 | 芋头科技（杭州）有限公司 | Indoor noise pollution automatic identification and monitoring system |
| CN105241545A (en) * | 2015-10-30 | 2016-01-13 | 李宗明 | Detection method and system of air-conditioning noises |
| CN107478323A (en) * | 2017-07-17 | 2017-12-15 | 芜湖泰领信息科技有限公司 | A kind of city noise monitoring method and system based on public bicycles |
| CN107563130A (en) * | 2017-08-03 | 2018-01-09 | 郑州云海信息技术有限公司 | A kind of method for estimating n group array fan noises |
| CN110031086A (en) * | 2018-01-05 | 2019-07-19 | 财团法人多次元智能It融合系统 | Interlayer noise measuring device and method and monitoring system |
| US11557279B2 (en) | 2018-05-07 | 2023-01-17 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Device, method and computer program for acoustic monitoring of a monitoring area |
| CN110715724A (en) * | 2019-08-12 | 2020-01-21 | 中国第一汽车股份有限公司 | Method for measuring and calculating noise in vehicle based on noise of rack and acoustic transmission function |
| CN110715724B (en) * | 2019-08-12 | 2021-10-08 | 中国第一汽车股份有限公司 | Method for measuring and calculating noise in vehicle based on noise of rack and acoustic transmission function |
| CN117012231A (en) * | 2023-10-07 | 2023-11-07 | 中国铁路设计集团有限公司 | Method for identifying noise sources of adjacent rooms caused by indoor equipment |
| CN117012231B (en) * | 2023-10-07 | 2023-12-12 | 中国铁路设计集团有限公司 | Method for identifying noise sources of adjacent rooms caused by indoor equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104359548A (en) | Indoor noise detection method | |
| CN108955870B (en) | Air conditioner noise testing method | |
| Buratti | Indoor noise reduction index with open window | |
| CN104131626A (en) | Turboset noise control method | |
| CN116502307A (en) | Method for evaluating influence of subway operation on vibration and secondary noise of adjacent building projects | |
| Coquel et al. | Analysis of ground-borne noise and vibration levels generated by buses | |
| Fahy et al. | Determination of statistical energy analysis loss factors by means of an input power modulation technique | |
| Buratti | Indoor noise reduction index with an open window (Part II) | |
| Krimm et al. | Updated urban facade design for quieter outdoor spaces | |
| Hawkins | Studies and research regarding sound reduction materials with the purpose of reducing sound pollution | |
| Girdhar et al. | Modeling a representative room to explore standard sound measurement methods for ASTM Impact Sound Rating testing | |
| CN117012231B (en) | Method for identifying noise sources of adjacent rooms caused by indoor equipment | |
| Chae et al. | Comparison of the Vibration and Acoustic Characteristics of Floor Structural System for Multi-Family Housing | |
| CN104032851B (en) | A kind of vibro-acoustic analysis laboratory | |
| CN110749375B (en) | Prediction method and device for transformer structure sound transmission in building room | |
| Mijić et al. | Measurement of reverberation gain in an urban environment | |
| Girdhar et al. | Measuring the impact force from the ISO impact ball and comparison with the tapping machine and alternate input method | |
| Dijckmans et al. | The repeatability and reproducibility of laboratory building acoustic measurements: Numerical study | |
| Li et al. | Experimental research on identification of ground-borne noise from subway lines based on partial coherence analysis | |
| Lurcock | Predicting groundborne noise and vibration in buildings from railways | |
| Zakariya et al. | Noise Characteristics and Sound Pressure Level Prediction of Loggia Balcony in Apartment | |
| Scoczynski Ribeiro et al. | Evaluating Airborne Sound Insulation in Dwellings Constructed with Hollow Ceramic Blocks under Brazilian Housing Policies | |
| Pareek | Method of Noise Control for Building | |
| CN118194624A (en) | Method and system for predicting indoor structural noise of subway adjacent residential building | |
| Roozen et al. | Laser scanning vibrometry measurements on a light weight building element |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150218 |