CN104405151A - Noise control method for air blower machine room - Google Patents
Noise control method for air blower machine room Download PDFInfo
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- CN104405151A CN104405151A CN201410679737.0A CN201410679737A CN104405151A CN 104405151 A CN104405151 A CN 104405151A CN 201410679737 A CN201410679737 A CN 201410679737A CN 104405151 A CN104405151 A CN 104405151A
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Abstract
The invention discloses a noise control method for an air blower machine room, and relates to a machine room noise control method. The method comprises the schemes of vibration noise testing and analyzing and noise treatment. The method comprises the following specific steps: measuring the noise inside and outside the air blower machine room by using a noise spectrum analyzer; distributing noise measuring points; measuring the vibration information of air blower unit equipment in the machine room by using the vibration spectrum analyzer. According to the vibration noise treatment scheme, acoustic calculation is adopted, a vibration-insulating principle, a vibration-insulating measure and wall surface sound-absorbing and sound-insulating treatment are comprised, and the transmission route of noise sources is insulated by absorbing sound, insulating sound, eliminating sound, damping and insulating vibration with a sound insulating door and a sound insulating window. According to the method, the transmission of equipment vibration energy in the machine room and the air transmission of noise is treated comprehensively by analyzing the properties of a plurality of vibration noise sources in the air blower machine room in combination with equipment vibration spectrum characteristics and the noise broadband characteristic, so that the sound environment in the machine room is improved, and the noise emission in a plant area is up to standard.
Description
Technical field
The present invention relates to a kind of machine room noise control method, particularly relate to a kind of noise control method of blast fan machine room.
Background technology
Blast fan unit is widely used in modern enterprise is produced, but in advantageous behinds such as efficient convenience, environmental protection, its problem of noise pollution produced can not be ignored.As certain Sewage Treatment at Pharmaceutical Factory workshop blast fan machine room, it is far away that this machine room is all no more than 15m apart from workman rest room, janitor's room and factory circle in factory, its noise produced brings to the workman in factory and greatly troubles, and the noise emission of factory simultaneously have also exceeded national standard.Vibrational energy simultaneously due to equipment blower unit is very large, and the body of wall of machine room has had trickle crackle, and staff obviously can feel the vibration on ground when patrolling and examining.Blast fan equipment acoustic noise level is generally at more than 100db (A), and the health substantially exceeded is lived the scope that can bear, and it is by belt transmission simultaneously, and vibrational energy is compared other through-drive equipment and wanted large.Therefore, the vibration noise avoiding unit to produce pollutes, and inquires into the vibration noise comprehensive regulation approach of blower fan unit, has certain realistic meaning to the vibration insulation and noise reduction of similar blast fan unit.
Summary of the invention
The object of the present invention is to provide a kind of noise control method of blast fan machine room, the method is by the analysis to many vibration noises source character in blast fan machine room, bonding apparatus rumble spectrum feature and the wide band characteristic of noise, in the comprehensive regulation machine room vibration equipment energy transmission and and the air borne of noise, acoustic environment in machine room is improved, and the noise emission of plant area reaches standard.
The object of the invention is to be achieved through the following technical solutions:
A noise control method for blast fan machine room, described method comprises involving vibrations noise testing analysis, noise abatement scheme; First noise spectrum analyzer is adopted to measure the noise inside and outside air blast machine room, noise point layout, the measurement that vibration spectrum analyzer carries out the blower unit vibration equipment information in machine room; Vibration noise resolution adopts acoustics to calculate, and comprises vibration isolation principle and vibration isolation measure, the process of metope sound absorption and insulation, and adopts soundproof door and sound proof window sound absorption, sound insulation, noise elimination, damping, vibration isolation means to cut off the route of transmission of noise source.
The noise control method of described a kind of blast fan machine room, described measurement blower noise is the steady-state noise in broad frequency band scope, and based on Low Medium Frequency, especially Mid Frequency draws wider.
The noise control method of described a kind of blast fan machine room, the noise of described method unit and pipe vibration radiation is based on medium and low frequency.
The noise control method of described a kind of blast fan machine room, described vibration isolation principle and vibration isolation measure, according to the spectrogram of test, for each unit vibration frequency feature, design vibration insulating foundation and the spring damping vibration isolator of different size, make it meet intrinsic frequency, frequency ratio, vibration transfer ratio, vibration isolation efficiency Vibration Absorbing System Design, the vibration of unit itself is not passed on basis, avoid room body to produce secondary structure noise.
The noise control method of described a kind of blast fan machine room, the process of described metope sound absorption and insulation, select broadband steel compound noise reduction board, i.e. sound insulating material and porous absorption material, with perforated plate as open cell type sound absorption material external surface, reconcile the sound absorption coefficient of sound absorption material at each frequency band by changing perforated percentage, and then increase the sound absorption coefficient of its low frequency part.
Advantage of the present invention and effect are:
The present invention is by the analysis to many vibration noises source character in blast fan machine room, bonding apparatus rumble spectrum feature and the wide band characteristic of noise, in the comprehensive regulation machine room vibration equipment energy transmission and and the air borne of noise, acoustic environment in machine room is improved, has certain realistic meaning to the vibration insulation and noise reduction of similar blast fan unit.
Accompanying drawing explanation
Fig. 1 air blast machine room noise point layout figure;
The third-octave noise figure of Fig. 2 measuring point 1;
Fig. 3 blower unit vibration acceleration spectrogram;
Vibration acceleration spectrogram on Fig. 4 blower unit basis;
The third-octave noise figure of Fig. 5 measuring point 1;
Vibration acceleration spectrogram on Fig. 6 blower unit pedestal;
Vibration acceleration spectrogram on Fig. 7 blower unit basis.
Detailed description of the invention
Below in conjunction with accompanying drawing illustrated embodiment, the invention will be further described.
The present invention is specifically implemented as follows:
1. vibration and noise test analysis:
The long 15m of air blast machine room, wide 6m.High 6m.Have 6 complete equipments in machine room, wherein large blower group operating weight reaches 2 tons, flow 56.5m
3/ min, power 110kW.Do not take any vibration insulation and noise reduction measure in machine room, north wall surfaces has four fan general window and two air inlets, east side metope Yishanmen, these are all important leakage sound and sound insulation weak spot.Unit itself is rigidly connected on ground, and pipeline is through walls to be also rigidly connected, and the connection of unit and pipeline only has an anti-vibration larynx, and these all make vibrational energy be delivered to easily in structure.
In order to the Noise Characteristic of equipment in accurate analysis machine room and the Vibration Condition of equipment, first Denmark B & K 2238 mediator noise spectrum analyzer is adopted to measure the noise inside and outside air blast machine room, as shown in Figure 1, noise measurement is as shown in table 1 for noise point layout.In order to analyze the vibration information of unit, apply the measurement that German Pu Lufu VIBXpert vibration spectrum analyzer carries out the blower unit vibration equipment information in machine room.The vibration measurement result of blower unit as shown in Figure 3 and Figure 4.
Can analyze from measurement result and obtain:
(1) noise of blast fan is a steady-state noise in broad frequency band scope, and be generally based on Low Medium Frequency, especially Mid Frequency draws wider.Owing to processing without any sound absorption in on-the-spot machine room, and in machine room, there is the sound insulation factor of a lot of leakage sound point and body of wall not enough, cause noise in machine room to arrive outdoor by air borne greatly.
(2) noise of unit and pipe vibration radiation.Unit in machine room does not do vibration isolation process, and the vibration of unit and the flow induced vibrations of pipeline all pass to structure, and to be then radiated in surrounding environment by vibrational energy with the form of construct noise and to go, this part noise is also based on medium and low frequency.
2. vibration noise resolution:
Thorough stress release treatment only has and controls noise source.But be more difficult by sound source being effected a radical cure noise, and be subject to various factors and environmental limit.Such as, operation improving method, transforms mechanical device structure, and improve the machining accuracy, assembly quality etc. of component, these control programs all can affect the structure of manufacturing schedule and machine.Therefore in noise source, noise control effect is undesirable, so should take appropriate measures in the approach of noise transmission, adopts acoustics to calculate and mainly comprises the means such as sound absorption, sound insulation, noise elimination, damping, vibration isolation to cut off the route of transmission of noise source.
To vibration and noise test and the specificity analysis of this blast fan machine room, do not affecting under the normal operation of unit, unit maintenance and precondition attractive in appearance, calculated by acoustics, adopt the noises of mode to blast fan machine room such as vibration isolation, sound insulation, sound absorption, noise elimination to administer.
2.1 vibration isolation principles and vibration isolation measure:
Degree of freedom vibrating isolation system is made up of the spring of a rigid objects quality of moving in the vertical direction and damper, and single-degree-of-freedom vibrating isolation system vibration isolating effect is with definitely transmitting ratio
t a represent, definition: the transmitting force being passed to basis by resiliency supported
f t amplitude and equipment itself disturb power
f 0(or moment
m 0) ratio of amplitude, as the formula (1):
In formula,
c/C 0for damping ratio;
f/f 0for frequency ratio;
ffor the forcing frequency of equipment, Hz;
f 0for the intrinsic frequency of vibrating isolation system, Hz.
When ignoring the damping of system, namely during undamped,
c/C 0when=0, the simplest this vibrating isolation system is called mass-spring system, and vibration transfer ratio is:
The vibration isolating effect of evaluation system, also uses vibration isolation efficiency sometimes
ηrepresent, vibration force is isolated a few percent, it and vibration transfer ratio
t a pass be:
Former blast fan basis is transformed, original base is cancelled, according to the spectrogram of test, for features such as each unit vibration frequencies, design vibration insulating foundation and the spring damping vibration isolator of different size, make it meet intrinsic frequency
f 0, frequency ratio
f/f 0, vibration transfer ratio
t a , vibration isolation efficiency
ηdeng Vibration Absorbing System Design requirement.The vibration of unit itself can not be passed on basis, thus avoid room body to produce secondary structure noise.
2.2 metope sound absorption and insulation process:
The effect of metope sound absorption process mainly absorbs in machine room and obtains reverberation sound and high-frequency noise, ensures the normal operating of patrolling and examining workman.The effect of metope sound insulation process mainly solves the problem of the sound insulation factor deficiency of body of wall, particularly to absorb sound poor defect to the sound insulation of low frequency.Material selec-tion adopts broadband steel compound noise reduction board, i.e. sound insulating material and porous absorption material.The performance of sound absorption material and on it size, perforated percentage, structural form etc. of aperture all have relation, and sound absorption material will have adequate thickness to play sound absorption.Again because porous absorber is generally larger for the sound absorption coefficient of medium-high frequency, and smaller to the sound absorption coefficient of low frequency.Therefore use perforated plate as open cell type sound absorption material external surface, reconcile the sound absorption coefficient of sound absorption material at each frequency band by changing perforated percentage, and then increase the sound absorption coefficient of its low frequency part.By Analysis of The Acoustic Fields, for improving overall noise reduction in blast fan machine room, broadband steel compound noise reduction board perforated percentage gets 9%, thus increases compressor room wall to the sound absorption coefficient of noise frequency composition.
2.3 soundproof doors and sound proof window:
For obtaining best noise reduction, original blast fan machine room door is replaced by soundproof door, and sound insulation factor is greater than 25dB and original window is replaced by sound proof window simultaneously, and sound insulation factor is greater than 20dB.
2.4 vibration insulation and noise reduction effects:
By doing the process such as above vibration isolation sound insulation to blower fan machine room, the noise nuisance that machine room is produced drops to minimum.Noise measurement is as shown in table 2, and as shown in Figure 5, the vibration acceleration frequency spectrum of unit is as shown in Fig. 6 Fig. 7 for the third-octave spectrogram of measuring point 1.
Noise measurement inside and outside machine room after table 2 vibration insulation and noise reduction
As can be seen from measurement result, the obvious reduction that the noise figure inside and outside machine room has, plant area's noise emission reaches GB, and the working environment of staff is greatly improved.Although the vibration of unit itself increases to some extent after vibration isolation, but also in allowed limits, but vibration passing obviously reduces to the energy on basis, on the pipeline of machine set outlet, pipeline shock preventing device is installed simultaneously, has reduce further the vibration of being transmitted by pipeline together with original anti-vibration larynx.
The very large reduction that the present invention makes the indoor and outdoor noise figure of blast fan machine room have by using vibration isolation and sound absorption and insulation process, and plant area's noise emission reaches lower than 0 class standard requirement in GB12348-2008 " Industrial Enterprise Factory Boundary ambient noise discharge standard ", i.e. 50dB (A), 40dB at night (A) between daytime, door external noise value drops to 75dB (A), machine room wall external noise value drops to 75dB (A), illustrates that the wideband noise that this vibration insulation and noise reduction resolution produces air blast machine room multicomputer is very effective.
Claims (5)
1. a noise control method for blast fan machine room, is characterized in that, described method comprises involving vibrations noise testing analysis, noise abatement scheme; First noise spectrum analyzer is adopted to measure the noise inside and outside air blast machine room, noise point layout, the measurement that vibration spectrum analyzer carries out the blower unit vibration equipment information in machine room; Vibration noise resolution adopts acoustics to calculate, and comprises vibration isolation principle and vibration isolation measure, the process of metope sound absorption and insulation, and adopts soundproof door and sound proof window sound absorption, sound insulation, noise elimination, damping, vibration isolation means to cut off the route of transmission of noise source.
2. the noise control method of a kind of blast fan machine room according to claim 1, is characterized in that, described measurement blower noise is the steady-state noise in broad frequency band scope, and based on Low Medium Frequency, especially Mid Frequency draws wider.
3. the noise control method of a kind of blast fan machine room according to claim 1, is characterized in that, the noise of described method unit and pipe vibration radiation is based on medium and low frequency.
4. the noise control method of a kind of blast fan machine room according to claim 1, it is characterized in that, described vibration isolation principle and vibration isolation measure, according to the spectrogram of test, for each unit vibration frequency feature, design vibration insulating foundation and the spring damping vibration isolator of different size, make it meet intrinsic frequency, frequency ratio, vibration transfer ratio, vibration isolation efficiency Vibration Absorbing System Design, the vibration of unit itself is not passed on basis, avoids room body to produce secondary structure noise.
5. the noise control method of a kind of blast fan machine room according to claim 1, it is characterized in that, the process of described metope sound absorption and insulation, select broadband steel compound noise reduction board, i.e. sound insulating material and porous absorption material, with perforated plate as open cell type sound absorption material external surface, reconcile the sound absorption coefficient of sound absorption material at each frequency band by changing perforated percentage, and then increase the sound absorption coefficient of its low frequency part.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106558302A (en) * | 2015-09-29 | 2017-04-05 | 国网智能电网研究院 | A kind of sound source device noise-reduction method |
| CN106682276A (en) * | 2016-12-05 | 2017-05-17 | 华东理工大学 | Ventilation cabinet operating noise control method based on CFD simulation |
| CN104913355B (en) * | 2015-06-29 | 2017-10-27 | 珠海格力电器股份有限公司 | Noise treatment system, method and device of range hood |
| CN109708244A (en) * | 2018-12-26 | 2019-05-03 | 中国机械工业集团有限公司 | A kind of central air-conditioning condensing plant is to building noise hazard diagnosis and processing method |
| CN109829196A (en) * | 2018-12-28 | 2019-05-31 | 中国机械工业集团有限公司 | A kind of self power-equipment noise hazard quantization control method |
| CN110626364A (en) * | 2019-09-24 | 2019-12-31 | 中车株洲电力机车有限公司 | Sound insulation structure of cooling system of railway vehicle and manufacturing method of sound insulation structure |
| CN111076246A (en) * | 2018-10-19 | 2020-04-28 | 宁波方太厨具有限公司 | Method for identifying abnormal sound of fault of range hood |
| CN112199866A (en) * | 2020-11-17 | 2021-01-08 | 中国舰船研究设计中心 | Method for identifying noise source of vane pump or fan |
| CN114189506A (en) * | 2021-12-09 | 2022-03-15 | 新奥数能科技有限公司 | Equipment inspection method, device and system |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913355B (en) * | 2015-06-29 | 2017-10-27 | 珠海格力电器股份有限公司 | Noise treatment system, method and device of range hood |
| CN106558302A (en) * | 2015-09-29 | 2017-04-05 | 国网智能电网研究院 | A kind of sound source device noise-reduction method |
| CN106558302B (en) * | 2015-09-29 | 2021-08-27 | 国网浙江省电力公司 | Noise reduction method for sound source equipment |
| CN106682276A (en) * | 2016-12-05 | 2017-05-17 | 华东理工大学 | Ventilation cabinet operating noise control method based on CFD simulation |
| CN111076246A (en) * | 2018-10-19 | 2020-04-28 | 宁波方太厨具有限公司 | Method for identifying abnormal sound of fault of range hood |
| CN111076246B (en) * | 2018-10-19 | 2021-07-23 | 宁波方太厨具有限公司 | Method for identifying abnormal sound of fault of range hood |
| CN109708244A (en) * | 2018-12-26 | 2019-05-03 | 中国机械工业集团有限公司 | A kind of central air-conditioning condensing plant is to building noise hazard diagnosis and processing method |
| CN109829196A (en) * | 2018-12-28 | 2019-05-31 | 中国机械工业集团有限公司 | A kind of self power-equipment noise hazard quantization control method |
| CN110626364A (en) * | 2019-09-24 | 2019-12-31 | 中车株洲电力机车有限公司 | Sound insulation structure of cooling system of railway vehicle and manufacturing method of sound insulation structure |
| CN110626364B (en) * | 2019-09-24 | 2021-10-22 | 中车株洲电力机车有限公司 | Sound insulation structure of cooling system of railway vehicle and manufacturing method of sound insulation structure |
| CN112199866A (en) * | 2020-11-17 | 2021-01-08 | 中国舰船研究设计中心 | Method for identifying noise source of vane pump or fan |
| CN112199866B (en) * | 2020-11-17 | 2022-07-15 | 中国舰船研究设计中心 | Method for identifying noise source of vane pump or fan |
| CN114189506A (en) * | 2021-12-09 | 2022-03-15 | 新奥数能科技有限公司 | Equipment inspection method, device and system |
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Application publication date: 20150311 |