CN106558302A - A kind of sound source device noise-reduction method - Google Patents
A kind of sound source device noise-reduction method Download PDFInfo
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Abstract
The present invention relates to a kind of sound source device noise-reduction method, including：The body vibration signal of the near field noise signal and sound source device of collection sound source device, determines the characteristic spectra and bandwidth of the noise signal and the characteristic spectra and bandwidth of the vibration signal；According to the noise characteristic frequency spectrum and bandwidth, room acoustic modeling model is set up, calculate indoor sound-filed simulation feature；Characteristic spectra and bandwidth, the characteristic spectra of the vibration signal and bandwidth and the room sound field distribution characteristics according to the noise signal, design sound absorbing module, sound insulation module, noise elimination module and vibration isolation rate.Technical solution of the present invention has good noise reduction, and Jing after noise reduction process, station circle's acoustic environment of factory and enterprise can be good at meeting the requirement of GB12348, be particularly suitable for the noise abatement of the indoor equipmenies such as transformer, reactor, steam turbine.
Description
Technical field
The present invention relates to noise control technique field, is more particularly to a kind of sound source device noise-reduction method.
Background technology
With propulsion and industrialized development, the land resource growing tension of urbanization, many residential areas are caused because neighbouring
Large enterprise, factory and deep perplexed by its noise.And standard requirement of the state's laws regulation to boundary's noise of standing is more and more tighter
Lattice, add the enhancing of masses' troxerutine tabtets, and noise complains the difficult problem for also becoming company manager's headache.Therefore, noise surpasses
Mark is not only related to the life Happiness Index of Residents, more becomes a major issue for limiting industrial enterprise's development.
In factory of enterprise, most sound source devices are all placed in the factory building of relative closure, and inner space is limited, for example, become
Transformer, reactor generally are in power station and are separately provided transformer chamber, reactor room.For convenience of equipment routing inspection, it is ensured that work
Make proper temperature, interior is typically provided door and window and ventilating system.The noise that equipment is produced in running is easily from these
Passage outside connection is propagated to surrounding.Further, since the wall of the factory building such as transformer chamber is processed without any sound absorption, if
Standby noise is overlapped mutually with through noise after running into wall reflection, is formed " standing wave " and " reverberation " effect, can be caused room
The raising of interior noise sound level.Therefore, the noise abatement of indoor sound source device, is the emphasis of all kinds of noise reduction engineerings.
The characteristics of being directly installed on ground or floor concrete pedestal mostly for current enterprise's shop equipment, by for equipment
Acoustic board, the mode such as sound insulationg board are installed, the aerial propagation of sound can only be intercepted, can not hinder sound along basis to
The approach of external diffusion.After the vibration that equipment is produced passes to basis, floor, wall or other structures, will cause and shake
Move, and pass to all sites of building in the form of elastic wave along building structure, and make adjacent air that vibration to occur,
Produce construct noise.Based on case above, to guarantee the validity of noise reduction engineering, need from sound absorption, sound insulation, eliminate the noise and
Four aspect systematicness of vibration isolation carry out noise abatement work.
The content of the invention
It is an object of the invention to provide a kind of sound source device noise-reduction method, realizes fast and efficiently Noise measarement.
For achieving the above object, the present invention is employed the following technical solutions：A kind of sound source device noise-reduction method, including：
The body vibration signal of the near field noise signal and sound source device of collection sound source device, determines the spy of the noise signal
Levy the characteristic spectra and bandwidth of frequency spectrum and bandwidth and the vibration signal；
According to the noise characteristic frequency spectrum and bandwidth, room acoustic modeling model is set up, calculate indoor sound-filed simulation feature；
Characteristic spectra and bandwidth, the characteristic spectra of the vibration signal and bandwidth and the room according to the noise signal
Interior sound-filed simulation feature, design sound absorbing module, sound insulation module, noise elimination module and vibration isolation rate.
Its near field noise signal is gathered using sound level meter in the sound source device 1.5m；Make in the sound source device
Described its described body vibration signal is set with vibration level meter collection in 1.5m.
The noise information and the vibration signal are carried out respectively spectrum analysis obtain the noise signal characteristic spectra and
The characteristic spectra and bandwidth of bandwidth and the vibration signal.
The indoor sound-filed simulation feature acquisition key position information maximum on room noise impact is calculated by described.
The sound absorbing module is microporous fiber composite acoustic board, including compound aluminum fiber acoustic board and microperforated panel；It is described
Aluminum fiber acoustic board is provided with the slit pore that some aluminum fibers are formed with aluminium foil；The aluminum fiber acoustic board is according to including its hole
Gap rate, thickness of slab, fibre diameter and fiber areal densities determine its acoustical absorptivity；The microperforated panel is according to including its punching rate
Its acoustical absorptivity is determined with resonance back of the body chamber thickness.
The various different proportions of the indoor total surface area are accounted in the indoor setting sound absorption mould according to the sound absorbing module
Block simultaneously carries out simulation of acoustic field analysis to the setting；Sound absorption effect in the different proportion is chosen by simulation of acoustic field analysis
Really optimal ratio is configured；Analyzed by the simulation of acoustic field choose the sound absorbing module installed in described indoor
Position causes acoustically effective best.
The sound insulation module includes steel plate, sound-absorption glass cotton and galvanized steel plain sheet；By filling resistance inside the sound-absorption glass cotton
The rigid material structural thickness of damping material thickness and galvanized steel plain sheet determines its sound-insulation capability.
The various different proportions of the indoor wall area are accounted in the indoor setting sound absorption mould according to the sound insulation module
The block setting to different proportion carries out simulation of acoustic field analysis；Chosen in the different proportion by simulation of acoustic field analysis
The optimal ratio of defening effect is set.；
The noise elimination module is silencer；By the sound channel design form of the silencer, anechoic sheet material thickness, material
Material unit weight and noise elimination length determine its acoustical absorptivity.
The vibration isolation rate includes flexible member and the damping element being arranged between vibration source and vibrating body；By the vibration isolation
The damping capacity of module, intrinsic frequency, the rigidity of structure and version determine its vibration isolation capability.
With immediate prior art ratio, the present invention provide technical scheme there is following excellent effect
1st, technical solution of the present invention establishes room acoustic modeling model, is analyzed by calculating, indoors wall locations
Deng position, as the multiple reflections and interference of sound wave become apparent from, thus impact of the relevant position to room noise
It is even more important, therefore sound absorbing module can be installed in relevant position pointedly, optimize acoustically effective；
2nd, technical solution of the present invention instructs various functions to join by simulation analysis in the design of sound absorbing module and noise elimination module
Several adjustment, has saved experimentation cost；
3rd, technical solution of the present invention adopts modular design concept, for being similar to Service Environment, arrangement, apparatus-form
Under, modular design can be adopted, workload can be greatly decreased, design efficiency is improved；；
4th, technical solution of the present invention is in the production design of acoustic damping materials, general modular sheet material structure, material specification,
Production efficiency, improving product stability, reduces cost can be greatly improved；
5th, technical solution of the present invention processes all kinds of noise reduction modules using novel noise reduction material-microporous fiber composite acoustic board, this
Plant material and can change itself acoustical behavior by adjusting the thickness of bi-level resonant cavity, once the feature of master goal noise
Frequency, so that it may targetedly adjust the functional parameter of noise reduction module, it is ensured that efficiently sqouynd absorption lowering noise；And the material does not fire and is stale-proof,
Environmental protection, light weight and process easy to process, have great application potential in noise reduction engineering；
6th, technical solution of the present invention carries out noise-reducing design in terms of sound absorption, sound insulation, noise elimination and sound insulation four, has cut off noise
From the indoor approach outwards propagated, the factory outside noise sound level of factory of enterprise is greatly reduced, disclosure satisfy that GB12348's
Require, be particularly suitable for the noise abatement of the interior such as transformer, reactor, steam turbine sound source device.
Description of the drawings
Fig. 1 is embodiment of the present invention noise measuring point figure；
Fig. 2 is that the embodiment of the present invention vibrates measuring point figure；
Fig. 3 is embodiment of the present invention transformer near field noise spectrogram；
Fig. 4 is embodiment of the present invention transformer body rumble spectrum figure；
Fig. 5 is embodiment of the present invention microporous fiber composite acoustic board structural representation；
Fig. 6 is embodiment of the present invention vibrating isolation system kinetic model schematic diagram；
Fig. 7 is embodiment of the present invention transport curve synoptic diagram；
1-microperforated panel, 2-aluminum fiberboard, 3-keel shoe.
Specific embodiment
With reference to embodiment, the invention will be described in further detail.
Embodiment 1：
The invention of this example provides a kind of sound source device noise-reduction method, by the structure optimization of noise reduction module and application design, real
Existing fast and efficiently Noise measarement, all kinds of noise-reducing devices, can modularization, batch metaplasia on the premise of General design
Produce, both ensured the stability of noise-reducing design, and reduced input cost again.This method is completed by following steps：
Methods described includes noise vibration signal collection, room acoustics simulation analysis and sound absorption, sound insulation, noise elimination, vibration isolation mould
Block structure theoretical calculation and functional parameter optimization design.Specially：
(1) its near field noise signal is gathered using sound level meter at sound source device 1m, as shown in Figure 1；Using vibration level meter
Collecting device body vibration signal, as shown in Fig. 2 grasping the characteristic spectra and bandwidth of noise vibration signal.
(2) indoor sound-filed simulation feature is calculated using finite element analysis software, obtaining affects maximum key to room noise
Positional information.
(3) sound absorbing module is made using microporous fiber composite acoustic board, and according to noise spectrum feature, determines composite sound absorbing
The acoustical behavior of plate, by the thickness for adjusting its pair of back of the body chamber, it is ensured that its absorption coefficient curve being capable of coverage goal noise comprehensively
Characteristic spectra.The structure of microporous fiber composite acoustic board is such as
(4) the total area ratio of sound absorbing module, installation site and absorption coefficient curve are input to as conditional parameter imitative
In true mode, by the various functions parameter of result of calculation feedback adjustment sound absorbing module, optimize acoustically effective.
(5) sound insulation module is made using " 1mm steel plate+100mm sound-absorption glass cotton+1mm steel plates ", will insulate against sound module
Total area ratio, packing material damping characteristic, the rigidity of structure be input in simulation model as conditional parameter, pass through
Result of calculation feedback regulation various functions parameter, optimizes defening effect.
(6) silencer is made using microporous fiber composite acoustic board, sets up silencer acoustics simulation model, by silencing channel
Version, deadener thickness, unit weight, air velocity are input in simulation model as conditional parameter, by calculating
As a result feedback regulation various functions parameter, optimizes soundproof effect.
(7) vibration isolation rate is manufactured using nitrile rubber, its damping capacity, intrinsic frequency is determined according to vibration signals spectrograph feature
Rate and the rigidity of structure, it is ensured that can reduce to greatest extent vibrating transmission efficiency.
(8) sound absorbing module is arranged on indoor wall, sound insulation module is installed at indoor gate, and noise elimination module is installed to
At ventilating system, vibration isolation rate is installed on sound source device base, real in terms of sound absorption, sound insulation, noise elimination and vibration isolation four
The systematization Noise measarement of existing sound source device.
Typical city indoor substation, all main transformers two, respectively positioned at independent transformer chamber carried out by certain power transformation
It is interior.The institute is located at down town region, and surrounding environment is complicated, and business, civil buildings stand in great numbers, and at boundary of standing most sensitive position
There is a residential building one, the building is apart from 22 meters of transformer chamber.Fieldtesting results show, under day-to-day operation operating mode, electric substation
Factory outside noise is basically stable at 52～53dB (A), level of the noise in 51～52dB (A), ring at 1 layer of residential building is outer 1 meter
Border affects more serious.On this basis, the factory outside noise of peak of power consumption period is calculated up to more than 60dB (A), outside residential building
Level of the noise in 57～61dB (A) at 1 meter, will have a strong impact on the normal life of nearby residents in the part operation period and stops
Breath.
For information above, below scheme is mainly taken：
1. transformer station's noise and vibration measurement and investigation.Grasping transformer chamber of electric substation dimension information, transformer device structure model, master
After wanting the information such as operating mode, measurement of correlation is carried out：Sound level meter acquisition noise signal is used at main transformer 1m, using vibration level
Meter collection transformer body vibration signal, line frequency Spectral characteristics analysis of going forward side by side grasp its characteristic spectra and bandwidth.Equipment it is near
Field noise pattern is as shown in figure 3, it follows that transformer noise acoustic energy is concentrated mainly on the low frequency of 12.5～500Hz
In the range of.As shown in figure 4, such noise waves are grown up, decay is slow, penetration power for the body vibration signals spectrograph figure of equipment
By force, need keypoint treatment.
2. main transformer room acoustics simulation analysis.Using Finite Element Simulation Software, analysis is modeled to room sound field.Transformer chamber
Cube for rectangle is built, according to acoustic theory, when main transformer equipment sends noise in this rectangular configuration,
Sound wave will be propagated in the form of direct sound wave forward, until when being close to body of wall wall border, with the back wave of sound wave and many
Secondary reflection configuration again is into standing wave.The sound wave that equipment sound source is radiated in main transformer room, before wall is run into and in free space
Radiation have no difference, it is simply slightly affected by the ambient.Afterwards, sound wave successively touches wall, side
To different sound waves through reflection, interfere, lose original sphere wave property.By repeatedly persistently reflecting, sound
Ripple may eventually reach stable state, is only left indoor permissible wave mode, is normal mode.Analog result shows, power transformation
The sound-filed simulation that station owner becomes indoor changes with frequency range difference.Noise of main transformer frequency based on low frequency, for all-bottom sound
For, as low frequency sonic wavelength is larger, the larger apart from node of normal mode is caused, it is empty in transformer chamber's wall and inside
Between define large range of strong noise standing wave region, in these regions, sound wave interaction is strong, directly results in sky
Interior overall noise significantly rises.Other band noises also have certain impact, the key area of its effect to overall sound field
At transformer chamber's wall.Therefore, low-frequency noise need to be directed to, sound absorbing module is installed on wall.
3. the structural theory of sound absorbing module is calculated and Functional Design.Sound absorbing module is with microporous fiber composite acoustic board to manufacture material
Material, the material are composited by aluminum fiber acoustic board and microperforated panel, as shown in Figure 5." aluminum fiber acoustic board " is porous
Resonance sound-absorbing material, with the slit pore that numerous aluminum fibers are formed with aluminium foil.When sound wave is entered in material along these pores
Portion, will cause air vibration in hole, produce the friction with hole wall so that part acoustic energy is converted into thermal dissipation.Fiber is narrow
Seam can also be equivalent to multiple anisodiametric resonant structures, will consume target frequency acoustic energy by resonant interaction.Microfracture plate
Acoustic impedance ratio can approximate representation be
Wherein,
It is full ellptic integral,For ellipticity.
In formula, η is air viscosity coefficient, and gap widths of the d=2a for fibrous material, 2l are gap length, and b is fibrous material gap
Centre-to-centre spacing between seam, σ=d/b are porosity, and t is thickness of slab, ρ0c0For the impedance operator in air.
On design of material and processing, can be by the ginseng such as " porosity, thickness of slab, fibre diameter, fiber areal densities " technique
Number adjustment material sound absorbing capabilities.
Microperforated panel reaches sound energy consumption effect by resonance sound-absorbing, and its resonant frequency is：
In formula, c is the velocity of sound, lkFor thickness of slab, P is punching rate, and D is cavity depth.
On design of material and processing, can be by being adjusted to punching rate P, resonance back of the body chamber thickness D carries out target noise frequency
The matching of rate.Acoustic impedance after the two is compound is
Design and match in device, by adjusting the dubbing of resonant cavity thickness, aluminum fiberboard parameter and microperforated panel parameter group
Resistance R (R1 be microperforated panel acoustic resistance, R2 be aluminum fiberboard acoustic resistance), acoustic mass M (M1 be microperforated panel acoustic mass, M2
For aluminum fiberboard acoustic mass), and cavity depth D1, D2, finally make the characteristic spectra of the resonant frequency of device to target noise
Skew is simultaneously finally coupled, and obtains the high acoustic absorption coefficient of target frequency bands.The acoustic absorptivity that final design is obtained is
The acoustic absorptivity of sound-absorbing material structure
| Sound sucting band | 250Hz | 500Hz | 1000Hz | 2000Hz | Noise reduction coefficient |
| Acoustic absorptivity | 0.8 | 0.9 | 0.7 | 0.8 | 0.8 |
In addition to the acoustic function of sound absorbing module, its total area ratio is also the key factor for affecting noise abatement.Select first
Take transformer chamber's total surface area 10%, 20%, 30%, 40% 4 kind of area ratio to be arranging sound absorbing module.Through sound field mould
Intend analysis to understand, when sound absorbing module total area accounts for 10%, the sound wave interference effect of transformer chamber's wall attachment different frequency range subtracts
Weak, internal acoustic field distribution optimization, transformer chamber overall noise level decline, the higher 100Hz of noise level, 200Hz,
315Hz, 630Hz band noise obtains a certain degree of decrease.When sound-absorbing material arrangement ratio is 10%, indoor wall
Nearby noise ratio is not added with about 3.8dB is reduced during sound-absorbing material.It is average in the range of calculated 100Hz～1000Hz
Reverberation time is 1.1s, illustrates that room reverberation effect decreases, and the arrangement of sound-absorbing material has played respective action.Sound absorption
When module area ratio is 20%, noise reduces 5.7dB, and the average reverberation time is 0.7s；When area ratio is 30%,
Noise reduces 7.19dB, and the average reverberation time is 0.58s；Area ratio is 40%, and noise reduces 8.03dB, average mixed
The time of sound is 0.46s.It follows that when arranging in main transformer room that the area of sound-absorbing material/structure is continuously increased, in main transformer room
Noise reduction presents ever-increasing trend, but is not linear increase relation, but increment is presented with the increase of arrangement areas
The trend successively decreased, the indoor arrangement areas of this explanation sound-absorbing material/structure are not the bigger the better, but there is an optimum value.
Meanwhile, the analysis of comprehensive Noise Reduction engineering overall economy quality, the final area ratio determined using 20%.
Position of the sound absorbing module on wall, also can produce certain impact to noise reduction.Respectively sound absorbing module is arranged on
At the top of corner, middle part and room, bring in FEM model simulation analysis into and understand, installed in corner when, noise is reduced
3.7dB, reverberation time are 0.78s；When installing in the air, noise reduces 5.21dB, and the reverberation time is 0.76s；Install
At top, noise reduces 4.6dB, reverberation time 0.73s.Therefore, sound absorbing module is arranged in the middle part of wall, can be effective
Play decrease of noise functions.
4. the function of the module that insulates against sound and application design.Sound insulation module adopts " 1mm steel plate+100mm sound-absorption glass cotton+1mm
The sound insulating structure of galvanized steel plain sheet ", is mainly used as soundproof door obstruct noise and outwards propagates from gate.It is main to affect sound insulation module
The factor of acoustical behavior is ratio, internal filling damping material thickness and the rigid material knot that sound insulation module occupies wall area
Structure thickness.According to the statistics of each transformer station's door body size, transformer chamber's door body area is chosen respectively and accounts for place wall area
70%, 40%, 10% 3 kind of area ratio to be analyzing the noise reduction of door body size.
Understand through sound field modeling analysis, for low-frequency sound wave, after door body is installed, low-frequency sound wave still has one
Fixed sound transmission ability, this kind of sound wave in part can be acted on by the particle vibration of door body, to acoustic energy is transmitted outdoors, caused
Low-frequency noise is still with certain intensity to outdoor propagation；For medium-high frequency sound wave, due in main transformer of transformer substation
High-frequency noise is less, thus this kind of noise energy is relatively weak, and the intensity and energy to outdoor transmission is also relatively small.
When the module proportion that insulates against sound is 70%, in sound insulation, calculated noise sound level is 39dB outdoors；Proportion 40%
When, noise sound level is 41dB outdoors；When proportion is 10%, noise sound level is 41.5dB outdoors.It follows that every
Impact of the glottis proportion to defening effect is less, and the economy of integration engineering considers, from 10% ratio.
To ensure the optimization sound insulation property of sound insulation module, 50mm, 100mm, 150mm thick damping is selected to fill out respectively
Material is filled, 0.5mm, 1.0mm and 1.5mm thick galvanized steel plain sheet of arranging in pairs or groups.As seen from the experiment, with damping filling
The increase of material and galvanized steel plain sheet thickness, the sound insulation property of the module that insulates against sound are consequently increased.Economy is considered with sound insulation
Performance, the damping filling materials+100mm for selecting 50mm thick thick galvanized steel plain sheet material.
5. the function of noise elimination module and application design.Ventilating system in transformer station is the important channel that noise of main transformer is outwards propagated
One of, it is to reduce station circle's noise, noise elimination noise reduction need to be carried out by installing silencer.And the silencing channel structure of noise elimination module
Form, anechoic sheet material thickness, material unit weight and noise elimination length are the key factors for affecting acoustic attenuation performance.
Simulation analysis are carried out to straight-plate-type, folded plate type and labyrinth silencer, from the point of view of the spectrum analysis of sound deadening capacity, according to
From straight-plate-type silencer, folded plate type silencer, labyrinth silencer order, acoustic attenuation performance peak of curve is gradually frequent from height
Section is moved to low frequency band, and the low frequency band sound deadening capacity in 63～500Hz is gradually increasing, and shows silencer in low frequency
The trend feature that frequency range sound deadening capacity gradually increases.Overall acoustic attenuation performance is straight-plate-type<Folded plate type<Labyrinth type.Due to the power transformation
Institute's noise frequency is based on low frequency, therefore selects labyrinth silencer.
By carrying out simulation analysis to different-thickness anechoic sheet, as thickness increases, the acoustic attenuation performance of noise elimination module is whole
Body is in rising trend, but the lifting of low frequency acoustic attenuation performance is not notable；As unit weight increases, acoustical behavior also increases；With disappearing
The increase of sound passage, acoustic attenuation performance substantially rise, but the value lifted after reaching a threshold value is obviously reduced.Mixed economy
Property and manufacturability consider that the parameter designing of the silencer is：Anechoic sheet thickness 50mm, unit weight 45kg/m3, silencing channel
Length 1300mm.
6. the function of vibration isolation rate and application design.Vibration isolation is exactly that flexible member and damping unit are arranged between vibration source and vibrating body
Part, to reduce or isolate the transmission of vibration.Here mainly discusses the situation of passive vibration isolation according to carrier-borne situation, it every
The mechanical model that shakes has damping spring quality system as shown in fig. 6, being generally reduced to single-degree-of-freedom.
When system is subject to ze=z0ejwtSimple harmonic quantity support exciting when, its equation of motion is represented by：
With u=z-zeBring into
In formula F (w) be with excitation square and change amplitude of exciting force.Solution can obtain the relative displacement amplitude of system：
System vibration transport can be obtained in the same manner：
In formula, ω is extraneous excitation force frequency；
For system frequency；
For system damping ratio.
Wherein .m is vibrating mass quality, and k is rigidity, and c is system damping coefficient, zeFor vibration displacement, z0For amplitude,
Z is initial displacement.
According to different damping than variation relation curve of the transport with frequency ratio is obtained, as shown in Figure 7.
In from the graph as can be seen that only whenWhen, vibration transmissibility η≤1 of system, i.e. system enter vibration isolation area.
In transformer Vibration Absorbing System Design, to be on the safe side, typically require that frequency ratio is located between 2.5-5.When frequency ratio is 1,
System is in resonance state.In vibration isolation region, with the reduction of damping ratio, the vibration isolating effect of system is become better and better；But hinder
Buddhist nun's ratio is less, and resonance magnifying power during system resonance is bigger, and the impact to equipment is larger.Therefore, preferable vibration isolator should
This is to make the intrinsic frequency of system low, has variable damping characteristic, the i.e. resonance region in system to have larger damping, make be
System does not have significant resonance and amplifies, and has less damping in vibration isolation area, makes system have good vibration isolation efficiency, and
Shock resistance and stability will be got well, and in the damping ratio of the system of selection, should consider the vibration isolation efficiency and resonance of system
Magnifying power, chooses a suitable damping ratio.And the isolation mounting design of power transmission and transforming equipment seeks to appropriate make vibration isolation
The damping of device system and rigidity.
According to the transformer rumble spectrum feature of collection, transformer vibrational energy is concentrated mainly on the frequency such as 25Hz, 50Hz
Region near section, its direction of vibration is based on vertical direction.In the structure design of vibration isolation rate, compression damping knot
Structure has vertical deformability and rigidity, meets vibration isolation requirement.In vibration isolation material is selected, it is conventional for natural rubber,
Nitrile rubber and butyl rubber, caused by its anti-vibration performance such as following table.
1 different rubber vibration isolation performance comparisons of table
As seen from the above table, the vertical stiffness and damping ratio of nitrile rubber are larger, add its bonding strength, ageing-resistant ability excellent
In other two kinds of rubber, therefore the function body of vibration isolation rate is the nitrile rubber of compression damping structure.
7., after above-mentioned sound absorbing module, sound insulation module, noise elimination module and vibration isolation rate are installed by transformer station, measured using sound level meter
Transformer chamber and Substation Station circle between daytime and night noise condition.Acquired results such as following table.
Before and after 2 transformer station of table administers, noise level is contrasted
| Zhou Jianzhan circle dB (A) | DB (A) before building between daytime | Night station circle dB (A) | DB (A) before night building | |
| Before improvement | 52～53 | 55 | 52～53 | 49 |
| After improvement | 43.3 | 50 | 41.15 | 42～43 |
As seen from the above table, this noise-reducing design achieves good effect, reaches with the station circle noise emission of the page between daytime
The requirement of GB12348.
Finally it should be noted that：Above example is only to illustrate technical scheme rather than a limitation, affiliated
The those of ordinary skill in field is although should be understood with reference to above-described embodiment：Still can be to the specific embodiment of the present invention
Modify or equivalent, these exist without departing from any modification or the equivalent of spirit and scope of the invention
Within the claims of the pending present invention of application.
Claims (10)
1. a kind of sound source device noise-reduction method, it is characterised in that：Including：
The body vibration signal of the near field noise signal and sound source device of collection sound source device, determines the characteristic spectra and bandwidth of the noise signal and the characteristic spectra and bandwidth of the vibration signal；
According to the noise characteristic frequency spectrum and bandwidth, room acoustic modeling model is set up, calculate indoor sound-filed simulation feature；
Characteristic spectra and bandwidth, the characteristic spectra of the vibration signal and bandwidth and the room sound field distribution characteristics according to the noise signal, design sound absorbing module, sound insulation module, noise elimination module and vibration isolation rate.
2. a kind of sound source device noise-reduction method as claimed in claim 1, it is characterised in that：Its near field noise signal is gathered using sound level meter in the sound source device 1.5m；Make to set described its described body vibration signal with vibration level meter collection in the sound source device 1.5m.
3. a kind of sound source device noise-reduction method as claimed in claim 1, it is characterised in that：Spectrum analysis is carried out respectively to the noise information and the vibration signal and obtains the characteristic spectra and bandwidth of the noise signal and the characteristic spectra and bandwidth of the vibration signal.
4. a kind of sound source device noise-reduction method as claimed in claim 1, it is characterised in that：The indoor sound-filed simulation feature acquisition key position information maximum on room noise impact is calculated by described.
5. a kind of sound source device noise-reduction method as claimed in claim 1, it is characterised in that：The sound absorbing module is microporous fiber composite acoustic board, including compound aluminum fiber acoustic board and microperforated panel；The aluminum fiber acoustic board is provided with the slit pore that some aluminum fibers are formed with aluminium foil；The aluminum fiber acoustic board determines its acoustical absorptivity according to including its porosity, thickness of slab, fibre diameter and fiber areal densities；The microperforated panel determines its acoustical absorptivity according to including its punching rate and resonance back of the body chamber thickness.
6. a kind of sound source device noise-reduction method as claimed in claim 5, it is characterised in that：The various different proportions of the indoor total surface area are accounted in the indoor setting sound absorbing module according to the sound absorbing module and simulation of acoustic field analysis is carried out to the setting；The optimal ratio of acoustically effective in the different proportion is chosen by simulation of acoustic field analysis to be configured；The position installed in the interior that the selection sound absorbing module is analyzed by the simulation of acoustic field causes acoustically effective best.
7. a kind of sound source device noise-reduction method as claimed in claim 1, it is characterised in that：The sound insulation module includes steel plate, sound-absorption glass cotton and galvanized steel plain sheet；Its sound-insulation capability is determined by the rigid material structural thickness for filling damping material thickness and galvanized steel plain sheet inside the sound-absorption glass cotton.
8. a kind of sound source device noise-reduction method as claimed in claim 7, it is characterised in that：The various different proportions of the indoor wall area are accounted in the indoor setting sound absorbing module according to the sound insulation module and the setting to different proportion carries out simulation of acoustic field analysis；The optimal ratio of defening effect in the different proportion is chosen by simulation of acoustic field analysis to be set.
9. a kind of sound source device noise-reduction method as claimed in claim 1, it is characterised in that：The noise elimination module is silencer；Its acoustical absorptivity is determined by the sound channel design form of the silencer, anechoic sheet material thickness, material unit weight and noise elimination length.
10. a kind of sound source device noise-reduction method as claimed in claim 1, it is characterised in that：The vibration isolation rate includes flexible member and the damping element being arranged between vibration source and vibrating body；Its vibration isolation capability is determined by the damping capacity of the vibration isolation rate, intrinsic frequency, the rigidity of structure and version.
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| CN109272981A (en) * | 2018-10-23 | 2019-01-25 | 云南电网有限责任公司 | A kind of substation's denoising device |
| CN109506904A (en) * | 2018-10-22 | 2019-03-22 | 北京工商大学 | A kind of thin plate harmonic radiation Noise Suppression Device design method |
| CN111696768A (en) * | 2020-05-13 | 2020-09-22 | 云南电网有限责任公司 | Outdoor transformer noise reduction method |
| CN112116901A (en) * | 2020-09-18 | 2020-12-22 | 北京市燃气集团有限责任公司 | Method for improving acoustic subjective evaluation index of medium-low pressure gas pressure regulating tank |
| CN112434416A (en) * | 2020-11-19 | 2021-03-02 | 西安西电变压器有限责任公司 | Method and device for determining body vibration isolation system and body vibration isolation system |
| CN112447163A (en) * | 2019-08-29 | 2021-03-05 | 比亚迪股份有限公司 | Noise reduction method and acoustic silencing structure in vehicle cab |
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| CN112447163A (en) * | 2019-08-29 | 2021-03-05 | 比亚迪股份有限公司 | Noise reduction method and acoustic silencing structure in vehicle cab |
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| CN112116901A (en) * | 2020-09-18 | 2020-12-22 | 北京市燃气集团有限责任公司 | Method for improving acoustic subjective evaluation index of medium-low pressure gas pressure regulating tank |
| CN112116901B (en) * | 2020-09-18 | 2024-03-05 | 北京市燃气集团有限责任公司 | Method for improving acoustic subjective evaluation index of medium-low pressure gas pressure regulating tank |
| CN112434416A (en) * | 2020-11-19 | 2021-03-02 | 西安西电变压器有限责任公司 | Method and device for determining body vibration isolation system and body vibration isolation system |
| CN112434416B (en) * | 2020-11-19 | 2023-09-05 | 西安西电变压器有限责任公司 | Method and device for determining vibration isolation system of body and vibration isolation system of body |
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