CN108363872A - The method for carrying out low frequency noise environmental improvement using super sound absorber - Google Patents
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- 239000006096 absorbing agent Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 16
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 41
- 238000004088 simulation Methods 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000009413 insulation Methods 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 claims description 14
- 238000002474 experimental method Methods 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 8
- 230000001174 ascending effect Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
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- 239000011449 brick Substances 0.000 description 1
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- 238000007405 data analysis Methods 0.000 description 1
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- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/10—Noise analysis or noise optimisation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2219/00—Indexing scheme relating to application aspects of data processing equipment or methods
- G06F2219/10—Environmental application, e.g. waste reduction, pollution control, compliance with environmental legislation
Abstract
The present invention relates to a kind of methods carrying out low frequency noise environmental improvement using super sound absorber, Step 1: measuring the frequency noise in low frequency noise source；Step 2: determining the height of super sound absorber according to the cover body in low frequency noise source and the space length in low frequency noise source；Step 3: making the super sound absorber model of different size；Step 4: the first and second detected components, which are not put into 4206 impedance tube of B＆K types, carries out oise insulation factor test；Step 5: the theoretical modeling of resonant cavity sound absorption is carried out using COMSOL softwares, until the gross data of COMSOL softwares fitting and the experimental data of step 4 are almost the same；Step 6: using COMSOL softwares, continue the expansion simulation that resonant cavity sound absorption is carried out using control variate method, and finally determine film thickness, diameter；Step 7：Several super sound absorbers are made, then the bottom of super sound absorber is fixed on the cover body inner wall in low frequency noise source.Realize that the specificity of specific frequency absorbs with minimum space, material and minimum cost.
Description
Technical field
Low frequency noise processing technology field of the present invention, and in particular to a kind of to be controlled using super sound absorber progress low frequency noise environment
The method of reason.
Background technology
Noise elimination plays an important role in our daily life, (is arrived 50 especially for low-frequency noise
Between 500Hz).Due to its penetration power height, realize that effective absorption of low-frequency noise is still a very large order at present.It inhales
The conventional material of sound, such as brick, concrete walls can provide noise attentuation with centering high.However, fully absorbing about
The noise of 300Hz needs its nearly half meter of thickness.With the development of the sound absorbing performance of new material, such as porous fibrous material, band
There is certain depth tuning cavity, required material thickness to be reduced to quarter-wave behind for the porous plate of hole or micropore, surface
It is long, it can realize considerable absorption.But as geometric dimension becomes smaller, can often cause and the faulty impedance matching of incidence wave.
Film resonator is to be sent to great expectations in a kind of future to realize the structure that low frequency noise absorbs.Various forms of films
Resonator has been proved to be able to realize that the perfect of sub-wavelength absorbs by hybridizing resonance, but current film resonator is all
The hydridization eigenstate of difference springform is manufactured using coin is pasted on film.
We have found that the perfect absorption of low frequency can also be reached by relying solely on the absorber of springform in an experiment, we
Wish to continue to use the cavity modes for the cylindricality rigid frame that elastic film is fixed on to interior sky.Model geometric shape under this pattern
Shape is simple, is easy to large-scale production and application, and parametric variable is few, is easy to study the pass of it and sound absorption frequency using control variate method
System, to provide a kind of completely new processing method for low frequency noise environmental improvement.
Invention content
For this purpose, the present invention is intended to provide it is a kind of using super sound absorber carry out low frequency noise environmental improvement method, including with
Lower step：
Step 1: measuring the frequency noise f in low frequency noise source by psophometer；
Step 2: the height h of super sound absorber is determined according to the cover body in low frequency noise source and the space length in low frequency noise source,
And 2cm≤h≤10cm；
Step 3: making the super sound absorber model of different size；
Super sound absorber model includes resonant cavity and elastic film, and resonant cavity is made of PLA material 3D printer, humorous
The cavity that shakes is the hollow cylinder of open at one end, and the elastic film just covers in resonant cavity open end and uses silica gel solid
Fixed, to surround a closed super sound absorber model, three parameters of super sound absorber model are height h, diameter d, film thickness a；
Height h, the diameter d of super sound absorber model immobilize, and film thickness a chooses 0.2mm, 0.3mm and 0.4mm respectively, system
Make the first detection group of three different film thickness；
Height h, the film thickness a of super sound absorber model immobilize, and diameter d chooses 6cm, 9cm respectively, and it is straight to make two differences
Second detection group of diameter；
Step 4: the first detected components, which are not put into 4206 impedance tube of B＆K types, carries out oise insulation factor test, and obtain first group
Experimental data, to analyze influence of the film thickness to sound absorption effect；By the second detected components be not put into 4206 impedance tube of B＆K types carry out every
Volume is tested, and obtains second group of experimental data, to analyze influence of the diameter to sound absorption effect；
Step 5: the theoretical modeling of super sound absorber sound absorption is carried out using COMSOL softwares, including：(1) according to super sound absorber
Structural parameters establish the 3D simulation models of resonant cavity；(2) material property is assigned to the 3D simulation models；(3) to described
3D simulation models carry out mesh generation；(4) by the gross data progress of experimental data and the fitting of COMSOL softwares in step 4
Compare, judge whether gross data is consistent with experimental data, if so, using the corresponding parameter of 3D simulation models as resonant cavity
The design parameter of body simultaneously skips to step 6；If it is not, then adjust the parameter of the 3D simulation models and repeat step 5, until
The gross data of COMSOL softwares fitting and the experimental data of step 4 are almost the same；
Step 6: using COMSOL softwares, continue the expansion simulation that resonant cavity sound absorption is carried out using control variate method：It will surpass
The height of sound absorber model is fixed, and the range of film thickness a is extended to 0.2mm~1mm, and ascending each increase 0.1mm, will
The range of diameter d is extended to 4cm~13cm, and ascending each increase 1cm is simulated, and finally determines film thickness, diameter
The influence curve of sound absorption effect can be reached so that it is determined that when frequency noise f of the super sound absorber for being measured in processing step one
The correspondence film thickness and diameter of predetermined sound absorption effect；
Step 7：According to the height h that step 2 determines, the diameter d and film thickness a that are determined in step 6 make several superabsorbent
Sound device, then the bottom of super sound absorber is fixed on the cover body inner wall in low frequency noise source.
The beneficial effects of the invention are as follows：According to the specific frequency of different low frequency noises, the film-type of adjustable parameter is utilized
Super sound absorber model, and combine COMSOL softwares carry out theoretical modeling, by change model size and elastic membrane thickness come
The absorption frequency and absorption coefficient for adjusting peak value will realize the spy of specific frequency with minimum space, material and minimum cost
The opposite sex absorbs, and is finally applied to the low frequency noise of processing specific frequency, has a vast market foreground.
Description of the drawings
Fig. 1 is the structural schematic diagram of super sound absorber model.
Fig. 2 is under level altitude and diameter, under three kinds of different film thickness, the relation curve of acoustic absorptivity A and corresponding frequencies f.
Fig. 3 is under level altitude and film thickness, under two kinds of different-diameters, the relation curve of acoustic absorptivity A and corresponding frequencies f.
Fig. 4 is the relation curve of the acoustic absorptivity A and corresponding frequencies f of 0.2mm~1mm film thickness ranges.
Fig. 5 is the frequency bandwidth of 0.2mm~1mm film thickness ranges and the function relation curve of film thickness.
Fig. 6 is the absorption peak frequency of 0.2mm~1mm film thickness ranges and the function relation curve of film thickness.
Fig. 7 is the relation curve of the acoustic absorptivity A and corresponding frequencies f of 4~13cm diameter ranges.
Fig. 8 is the frequency bandwidth of 4~13cm diameter ranges and the function relation curve of diameter.
Fig. 9 is~absorption peak frequency of 13cm diameter ranges and the function relation curve of diameter.
Figure 10 is film thickness experiment and analog result is 0.4mm, reaches perfect near 314Hz and absorbs schematic diagram.
Figure 11 is film thickness experiment and analog result is 0.8mm, reaches perfect near 199Hz and absorbs schematic diagram.
Specific implementation mode
By way of example and in conjunction with the accompanying drawings, the invention will be further described：
A method of low frequency noise environmental improvement being carried out using super sound absorber, is included the following steps：
Step 1: measuring the frequency noise f in low frequency noise source by psophometer, it is low such as to become distribution computer room and air-conditioning
The main source of frequency noise, the former noise frequency are about 199Hz, and the noise frequency of the latter is about 314Hz.
Step 2: the height h of super sound absorber is determined according to the cover body in low frequency noise source and the space length in low frequency noise source,
And 2cm≤h≤10cm.Low frequency noise source would generally be covered by cover body (being usually a confined space, such as sound insulation house), to reduce
Super sound absorber is arranged on cover body inner wall by noise pollution.It is limited by cover body and the space in low frequency noise source, usually super sound absorber
Height to ensure that cloth postpones, do not influence the normal work of sound insulation house, height h is preferably 6cm.
Step 3: making the super sound absorber model of different size；
As shown in Figure 1, super sound absorber model is made of resonant cavity and elastic film two parts.Resonant cavity uses PLA
Material 3D printer is made, and resonant cavity is the hollow cylinder of open at one end.Elastic film is just covered in resonant cavity opening
It holds and silica gel is used to fix, to surround a super sound absorber model of closing.Three parameters of super sound absorber model be height h,
Diameter d, film thickness a.
In order to carry out the experiment of super sound absorber model using control variate method, the super sound absorber mould for making different size is needed
Type.In tri- the height h of super sound absorber model, diameter d, film thickness a parameters of structural dimension, influences of the height h to sound absorption effect
It almost can be ignored, and the height h of super sound absorber model is limited by space in practical applications, therefore without superabsorbent
The sound absorption of the height h of sound device model influences simulated experiment, and only carry out diameter d, film thickness a influences simulated experiment to the sound absorption of noise.
Specially：Height h=6cm, the diameter d=6cm of super sound absorber model immobilize, and film thickness a chooses respectively
0.2mm, 0.3mm and 0.4mm make the first detection group of three different film thickness.
In addition, the height h=6cm of super sound absorber model, film thickness a=0.4mm immobilize, diameter d choose respectively 6cm,
9cm makes the second detection group of two different-diameters.
Step 4: the first detected components, which are not put into 4206 impedance tube of B＆K types, carries out oise insulation factor test, and obtain first group
Experimental data, to analyze influence of the film thickness to sound absorption effect.As illustrated in solid line in figure 2：As film thickness increases, the best peak frequency that absorbs sound
Rate significantly reduces, and acoustic absorptivity increases, and frequency bandwidth reduces.
Second detected components are not put into 4206 impedance tube of B＆K types and carry out oise insulation factor test, and obtain second group of experiment number
According to analyze influence of the diameter to sound absorption effect.As shown on the solid line in figure 3：As diameter increases, the best peak frequency that absorbs sound slightly has
It reduces, acoustic absorptivity is increased slightly, and frequency bandwidth obviously increases.In the step 4, preferably dual microphone is utilized to obtain first
Group, second group of experimental data.
Step 5: the theoretical modeling of super sound absorber sound absorption is carried out using COMSOL softwares, including：(1) according to super sound absorber
Structural parameters establish the 3D simulation models of resonant cavity；(2) material property is assigned to the 3D simulation models；(3) to described
3D simulation models carry out mesh generation；(4) by the gross data progress of experimental data and the fitting of COMSOL softwares in step 4
Compare, judge whether gross data is consistent with experimental data, if so, using the corresponding parameter of 3D simulation models as resonant cavity
The design parameter of body simultaneously skips to step 6；If it is not, then adjust the parameter of the 3D simulation models and repeat step 5, until
The gross data of COMSOL softwares fitting and the experimental data of step 4 are almost the same.
The gross data characteristic that COMSOL softwares calculate is as shown in phantom in Figure 2：As film thickness increases, the best peak frequency that absorbs sound
Rate is substantially reduced, and acoustic absorptivity and frequency band are basically unchanged.Gross data is almost the same with experimental data, to which we obtain knot
By：Fixed in other parameters, the peak frequency that absorbs sound completely reduces with the increase of film thickness, is inversely proportional with film thickness.
The gross data characteristic that COMSOL softwares calculate is as shown in phantom in Figure 3：As diameter increases, the best peak frequency that absorbs sound
Rate reduces, and frequency bandwidth obviously increases, and acoustic absorptivity is basically unchanged.Gross data is almost the same with experimental data, to us
It draws a conclusion：Fixed in other parameters, the peak frequency that absorbs sound completely increases with the increase of diameter, with diameter at just
Than.
Pass through above step, it can be deduced that preliminary conclusion, compared with experimental data, the overall trend of theory sound absorption seems to compare
More perfect, this phenomenon may be the experimental error caused by manual operation, the interference of external environment, and elasticity of film etc. is uneven
Property, fixed film is to the tight ness rating of frame, and caused by error of 3D printing models etc., the combination that theoretical modeling and experiment measure shows
The correctness of above-mentioned conclusion.
Step 6: using COMSOL softwares, continue the expansion simulation that resonant cavity sound absorption is carried out using control variate method：It will surpass
The height of sound absorber model is fixed, and the range of film thickness a is extended to 0.2mm~1mm, and ascending each increase 0.1mm, will
The range of diameter d is extended to 4cm~13cm, and ascending each increase 1cm is simulated, and finally determines film thickness, diameter
The influence curve of sound absorption effect can be reached so that it is determined that when frequency noise f of the super sound absorber for being measured in processing step one
The correspondence film thickness and diameter of predetermined sound absorption effect.
Expansion of the Thickness Variation to sound absorption effect：Fig. 4-Fig. 6 shows the simulation result and data point of different film thicknesses
Analysis；Wherein, Fig. 4 shows to be moved to the left with the increase of film thickness, absorption peak, and bandwidth tapers into；Fig. 5 and Fig. 6 shows simulation
As a result concrete analysis, bandwidth (corresponding acoustic absorptivity is that maximum value obtains the difference between 50% volume, two frequencies) and sound absorption peak frequency
Rate reduces with the increase of film thickness.
Expansion of the diameter change to sound absorption effect：Fig. 7-Fig. 9 shows simulation result and the data analysis of different-diameter；
Wherein, Fig. 7 shows whole sound absorption images corresponding with the different-diameter of model；We are it can be found that there are two in Fig. 8
Extreme point, when diameter is less than 6cm, bandwidth increases with diameter and is reduced.On the contrary, when diameter changes in the range of 6cm to 9cm
When, bandwidth is gradually increased with diameter increase.When diameter is more than 10cm, bandwidth is stablized in about 150Hz.Such as Fig. 9, absorption peak frequency
Rate fluctuates near 300Hz, there is an extreme point in fig.9, and corresponding abscissa is 8cm, on the left of extreme point, absorbs
Crest frequency reduces with the increase of diameter, however, when diameter is when between 8 centimetres to 9 centimetres, absorption peak frequency with
The increase of diameter and become larger.
It was found that exploration and conclusion and above-mentioned theory based on experiment calculate, the absorption peak frequency of model is with film
Thick changing rule variation, shows e index function.
Y=A × exp (- x^t2/t1)+y0
(A=323.64208, t1=0.15885, t2=1.96122, y0=193.013434), y is absorption peak frequency,
X is film thickness.
Change distribution computer room and air-conditioning are the main sources of low frequency noise, the former noise frequency is about 199Hz, and the latter's makes an uproar
Acoustic frequency is about 314Hz.For super sound absorber model (a diameter of 9cm is highly 6cm), calculated according to above-mentioned formula, the thickness of film
Degree should be set as 0.4mm and 0.8mm, to realize perfect absorb under correlated frequency.Then, we simulate two of different film thicknesses
Model is verified, as a result as shown in Figure 10 and Figure 11.There is apparent absorption peak near 199Hz and 314Hz, two models
Experimental result is coincide good with analog result.
Step 7：According to the height h that step 2 determines, the diameter d and film thickness a that are determined in step 6 make several superabsorbent
Sound device, then the bottom of super sound absorber is fixed and is paved on the cover body inner wall in low frequency noise source.Tiling is covered in low frequency noise source
Cover body inner wall on super sound absorber, absorb sound jointly to noise, reduce noise band come environmental pollution.
Claims (4)
1. a kind of method carrying out low frequency noise environmental improvement using super sound absorber, which is characterized in that include the following steps：
Step 1: measuring the frequency noise f in low frequency noise source by psophometer；
Step 2: the height h of super sound absorber is determined according to the cover body in low frequency noise source and the space length in low frequency noise source, and
2cm≤h≤10cm；
Step 3: making the super sound absorber model of different size；
Super sound absorber model includes resonant cavity and elastic film, and resonant cavity is made of PLA material 3D printer, resonant cavity
Body is the hollow cylinder of open at one end, and the elastic film is just covered in resonant cavity open end and fixed using silica gel, from
And a closed super sound absorber model is surrounded, three parameters of super sound absorber model are height h, diameter d, film thickness a；
Height h, the diameter d of super sound absorber model immobilize, and film thickness a chooses 0.2mm, 0.3mm and 0.4mm respectively, make three
First detection group of a difference film thickness；
Height h, the film thickness a of super sound absorber model immobilize, and diameter d chooses 6cm, 9cm respectively, two different-diameters of making
Second detection group；
Step 4: the first detected components, which are not put into 4206 impedance tube of B＆K types, carries out oise insulation factor test, and obtain first group of experiment
Data, to analyze influence of the film thickness to sound absorption effect；Second detected components are not put into 4206 impedance tube of B＆K types and carry out oise insulation factor
Test, and second group of experimental data is obtained, to analyze influence of the diameter to sound absorption effect；
Step 5: the theoretical modeling of super sound absorber sound absorption is carried out using COMSOL softwares, including：(1) according to the knot of super sound absorber
Structure parameter establishes the 3D simulation models of resonant cavity；(2) material property is assigned to the 3D simulation models；(3) imitative to the 3D
True mode carries out mesh generation；(4) experimental data in step 4 is compared with the gross data that COMSOL softwares are fitted,
Judge whether gross data is consistent with experimental data, if so, using the corresponding parameter of 3D simulation models as resonant cavity
Design parameter simultaneously skips to step 6；If it is not, then adjusting the parameter of the 3D simulation models and repeating step 5, until COMSOL is soft
The gross data of part fitting and the experimental data of step 4 are almost the same；
Step 6: using COMSOL softwares, continue the expansion simulation that resonant cavity sound absorption is carried out using control variate method：By superabsorbent sound
The height of device model is fixed, and the range of film thickness a is extended to 0.2mm~1mm, and ascending each increase 0.1mm, by diameter
The range of d is extended to 4cm~13cm, and ascending each increase 1cm is simulated, and finally determines film thickness, diameter to inhaling
The influence curve of sound effective value can reach predetermined so that it is determined that when frequency noise f of the super sound absorber for being measured in processing step one
The correspondence film thickness and diameter of sound absorption effect；
Step 7：According to the height h that step 2 determines, the diameter d and film thickness a that are determined in step 6 make several superabsorbent sound
Device, then the bottom of super sound absorber is fixed and is paved on the cover body inner wall in low frequency noise source.
2. the method described in accordance with the claim 1 for carrying out low frequency noise environmental improvement using super sound absorber, it is characterised in that：Institute
The height h for stating the super sound absorber model of the first detection group in step 3 is 6cm, and diameter d is 6cm.
3. the method for carrying out low frequency noise environmental improvement using super sound absorber according to claim 2, it is characterised in that：Institute
The height for stating the super sound absorber model of the second detection group in step 3 is 6cm, and film thickness a is 0.4mm.
4. the method described in accordance with the claim 1 for carrying out low frequency noise environmental improvement using super sound absorber, it is characterised in that：Institute
It states in step 4, first group, second group of experimental data is obtained using dual microphone.
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| CN110807288A (en) * | 2019-11-18 | 2020-02-18 | 重庆大学 | Customizable broadband efficient ventilation sound absorber finite element simulation and demonstration verification method |
| CN112651155A (en) * | 2020-12-19 | 2021-04-13 | 重庆大学 | Finite element simulation and demonstration verification method for ventilation self-adaptive low-frequency efficient sound absorber |
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| CN112651155A (en) * | 2020-12-19 | 2021-04-13 | 重庆大学 | Finite element simulation and demonstration verification method for ventilation self-adaptive low-frequency efficient sound absorber |
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