CN109373399A - A kind of wideband noise-reduction method with noise interference device kitchen ventilator - Google Patents
A kind of wideband noise-reduction method with noise interference device kitchen ventilator Download PDFInfo
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- CN109373399A CN109373399A CN201811420947.2A CN201811420947A CN109373399A CN 109373399 A CN109373399 A CN 109373399A CN 201811420947 A CN201811420947 A CN 201811420947A CN 109373399 A CN109373399 A CN 109373399A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/161—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general in systems with fluid flow
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
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Abstract
A kind of wideband noise-reduction method with noise interference device kitchen ventilator, the kitchen ventilator are provided with smoke machine main body and noise interference device, and noise interference device is assemblied in smoke machine main body.Noise interference device of the invention can generate frequency according to the fan blade of kitchen ventilator and be designed, and obtaining resonant frequency is the first basic frequency f0,1, the second basic frequency f0,2, the first noise reduction subfrequency fS1With the second noise reduction subfrequency fS2Noise interference device, therefore the noise interference device can offset noise identical with above-mentioned resonant frequency.Simultaneously as noise waves enter noise interference device, it just will form after noise waves leave noise interference device and have dephased interference wave with the noise waves of main air duct, interference wave makes the amplitude of remaining noise waves weaken or reduce.Therefore noise interference device, which can be realized, reduces the broadband noise waves that kitchen ventilator generates, and reaches maximum broad-band noise-reducing effect.
Description
Technical field
The present invention relates to kitchen ventilator field, in particular to a kind of wideband noise-reduction method with noise interference device kitchen ventilator.
Background technique
It is chronically in the environment of high noisy, the hearing of people is often damaged, and can also be made in the environment of having noise for a long time
At user emotion problem.As people's quality of the life improves, people are also lower and lower to the tolerance of noise.Therefore kitchen ventilator
Noise reduction is also got more and more attention.
Kitchen ventilator noise reduction in the prior art is mostly the reduction that noise is realized by active noise reduction and passive noise reduction mode.
Active noise reduction mode can only act on noise of the frequency within 1000Hz, can only be by passive for the noise greater than 1000Hz
Noise reduction technology processing.However passive noise reduction is mainly by being wrapped in noise source or pipeline with acoustical cotton.But exist following several
A disadvantage: one, air pressure consume is excessive, and noise and fluid are needed across acoustical cotton, and sound can be consumed using friction, reach drop
The effect made an uproar, but air performance is reduced simultaneously.Two, it is difficult to select suitable acoustical cotton, seldom supplying factory can mention
For acoustical cotton can acoustic absorptivity at different frequencies data, therefore the manufacturing enterprise of kitchen ventilator can only continuously attempt to and mistake
In find out type or thickness of suitable acoustical cotton etc..Three, the noise reduction frequency of acoustical cotton is uncontrollable, for universal acoustical cotton
Maximum noise reduction effect cannot be reached under specified narrow frequency, different strategies can not be collocated with each other from design also to carry out more
Effective noise reduction.
Therefore in view of the shortcomings of the prior art, providing a kind of wideband noise-reduction method with noise interference device kitchen ventilator to solve
Prior art deficiency is very necessary.
Summary of the invention
A kind of band noise interference device kitchen ventilator is provided it is an object of the invention to avoid the deficiencies in the prior art place
Wideband noise-reduction method.The wideband noise-reduction method with noise interference device kitchen ventilator can reduce specific multi-frequency noise and reach
Wideband noise reduction.
Above-mentioned purpose of the invention is realized by following technical measures:
A kind of wideband noise-reduction method with noise interference device kitchen ventilator is provided, kitchen ventilator is provided with smoke machine main body and noise
Interference device, noise interference device are assemblied in smoke machine main body.
The resonant frequency of noise interference device is Chong Die with broadband noise waves are generated when the operation of kitchen ventilator.
Preferably, above-mentioned noise interference device setting is there are two opening, two main air ducts with smoke machine main body respectively that are open
The horizontal position of connection and two openings is different.
Broadband noise waves are propagated in main air duct, and when encountering noise interference device, broadband noise waves are divided into the first via
Broadband noise waves and second are had a lot of social connections frequency noise wave, and the continuation of first via broadband noise waves is propagated in main air duct；Second tunnel
Broadband noise waves enter noise interference device and resonate with noise interference device, and from wherein the one of noise interference device
A opening, which comes out, imports main air duct.
It is propagated after importing main air duct with main air duct from the first via broadband noise waves that noise interference device propagates from
Second have a lot of social connections frequency noise wave there are phase difference, first via broadband noise waves and the second frequency noise wave of having a lot of social connections interfere
Interference broadband noise waves are formed, interference broadband noise waves weaken relative to the amplitude of broadband noise waves, noise reduces.
Preferably, above-mentioned resonant frequency is the first basic frequency f0,1, the second basic frequency f0,2, the first noise reduction subfrequency fS1
With the second noise reduction subfrequency fS2。
The resonant frequency of noise interference device obtains step:
Step 1: the fan blade for obtaining kitchen ventilator generates frequency fF；
Step 2: generating frequency f according to the fan blade that step 1 obtainsF, determine noise interference device target noise reduction frequency
First basic frequency f of rate0,1；
Step 3: the first basic frequency f obtained according to step 20,1,Determine the length L of noise interference deviceaIt is opened with two
The shortest distance Δ L of mouth；
Step 4: the L obtained according to step 3aWith Δ L, noise interference assembly dia C is determined；
Step 5: according to the L of step 4aWith the value of Δ L, the second of noise interference device target noise reduction frequency is calculated
Basic frequency f0,2；
Step 6: the first basic frequency f obtained according to step 20,1The the second basic frequency f obtained with step 50,2, calculate
Obtain the first noise reduction subfrequency f of noise interference device target noise reduction frequencyS1With the second noise reduction subfrequency fS2。
Preferably, above-mentioned steps one are specifically, the frequency f that the fan blade of kitchen ventilator generatesFIt is obtained by formula (I),
fF=β Ψ ω formula (I),
Wherein β=1/60, Ψ are the number of sheets of fan blade, and ω is the rotation speed of primary blades.
Preferably, above-mentioned steps two are specifically, generate frequency f according to the fan blade that step 1 obtainsF, pass through formula (II)
Obtain the first basic frequency f of noise interference device target noise reduction frequency0,1,
f0,1=dfFFormula (II),
Wherein d is noise reduction weight factor, and d is positive number.
Preferably, above-mentioned steps three are specifically, determine L by formula (III)aWith the value of Δ L,
Wherein t is the velocity of sound, and N is subfrequency multiple, acquires N by formula (IV),
N=(2p+1)/2 formula (IV),
It is wherein p is multiple weight factor, and p is 0 or any positive integer.
Preferably, above-mentioned La> Δ L.
Preferably, above-mentioned steps four are specifically, the L obtained according to step 3aWith Δ L, C is obtained by formula (V),
Preferably, above-mentioned steps five are specifically, according to the L of step 4aIt is dry to obtain noise by formula (VI) for value with Δ L
Relate to the second basic frequency f of device target noise reduction frequency0,2,
Wherein k is the ratio of time humorous frequency multiple, and k=2/3.
Preferably, above-mentioned steps six specifically,
Step 6.1, the first basic frequency f obtained according to step 20,1Noise interference device target drop is obtained by formula (VII)
First noise reduction subfrequency f of frequency of making an uproars1,
fs1=[3f0,1,5f0,1,...........,xf0,1] formula (VII),
Wherein ∞ >=x >=2m+1, m=1,2,3....., ∞,
Step 6.2, the second basic frequency f obtained according to step 50,2, noise interference device target is obtained by formula (VIII)
Second noise reduction subfrequency f of noise reduction frequencys2,
fs2=[2f0,2,3f0,2,...........,yf0,2] formula (VIII),
Wherein ∞ >=y >=2.
Preferably, above-mentioned noise interference device is provided with multiple.
Preferably, above-mentioned C is single value or multiple values.
Preferably, above-mentioned LaFor single value or multiple values.
Preferably, above-mentioned Δ L is single value or multiple values.
Preferably, above-mentioned phase difference is 150 °~180 °.
A kind of wideband noise-reduction method with noise interference device kitchen ventilator of the invention, the kitchen ventilator are provided with smoke machine main body
With noise interference device, noise interference device is assemblied in smoke machine main body.The resonant frequency and kitchen ventilator of noise interference device are run
When generate broadband noise waves overlapping.The setting of noise interference device is there are two opening, two masters with smoke machine main body respectively that are open
The horizontal position of air duct connection and two openings is different.Noise interference device of the invention can be according to the fan blade of kitchen ventilator
It generates frequency to be designed, obtaining resonant frequency is the first basic frequency f0,1, the second basic frequency f0,2, the first noise reduction subfrequency
fS1With the second noise reduction subfrequency fS2Noise interference device, therefore the noise interference device can be offset and above-mentioned resonance
The identical noise of frequency.Simultaneously as noise waves enter noise interference device, it will after noise waves leave noise interference device
It is formed and has dephased interference wave with the noise waves of main air duct, interference wave makes the amplitude of remaining noise waves weaken or reduce.
Therefore noise interference device, which can be realized, reduces the broadband noise waves that kitchen ventilator generates, and reaches maximum broad-band noise-reducing effect.
Detailed description of the invention
Using attached drawing, the present invention is further illustrated, but the content in attached drawing is not constituted to any limit of the invention
System.
Fig. 1 is a kind of flow chart of the wideband noise-reduction method with noise interference device kitchen ventilator of the present invention.
Fig. 2 is the noise interference device and main air duct structural schematic diagram of embodiment 1.
Fig. 3 is the schematic cross-section of Fig. 2.
Fig. 4 is the length L of noise interference deviceaSchematic diagram.
Fig. 5 is the schematic diagram of the shortest distance Δ L of two openings.
Fig. 6 is that embodiment 2 is noise interference device and main air duct structural schematic diagram.
Fig. 1 includes into Fig. 6:
Noise interference device 1 and main air duct 2.
Specific embodiment
Technical solution of the present invention is described further with the following Examples.
Embodiment 1.
A kind of wideband noise-reduction method with noise interference device kitchen ventilator, kitchen ventilator are provided with smoke machine main body and noise interference
Device 1, noise interference device 1 are assemblied in smoke machine main body.
It is Chong Die that broadband noise waves are generated when the resonant frequency of noise interference device 1 is run with kitchen ventilator.
As shown in Fig. 2 to 5, noise interference device 1 setting there are two opening, two opening respectively with the main wind of smoke machine main body
The K of the connection of road 2 and horizontal position difference such as Fig. 3 of two openings1K2It is shown.
Broadband noise waves are propagated in main air duct, and when encountering noise interference device 1, broadband noise waves are divided into the first via
Broadband noise waves and second are had a lot of social connections frequency noise wave, and the continuation of first via broadband noise waves is propagated in main air duct 2；Second tunnel
Broadband noise waves enter noise interference device 1 and resonate with noise interference device 1, and wherein from noise interference device
One opening, which comes out, imports main air duct 2.
It is passed after importing main air duct with main air duct 2 from the first via broadband noise waves that noise interference device 1 propagates from
Second broadcast has a lot of social connections frequency noise wave there are phase difference, first via broadband noise waves and second have a lot of social connections frequency noise wave occur it is dry
It relates to form interference broadband noise waves, interference broadband noise waves weaken relative to the amplitude of broadband noise waves, noise reduces.
Resonant frequency is the first basic frequency f0,1, the second basic frequency f0,2, the first noise reduction subfrequency fS1With the second noise reduction
Subfrequency fS2。
The resonant frequency of noise interference device 1 obtains step, as shown in Figure 1:
Step 1: the fan blade for obtaining kitchen ventilator generates frequency fF；
Step 2: generating frequency f according to the fan blade that step 1 obtainsF, obtain 1 target noise reduction frequency of noise interference device
First basic frequency f of rate0,1；
Step 3: the first basic frequency f obtained according to step 20,1, determine the length L of noise interference device 1aWith two
The shortest distance Δ L of opening；
Step 4: the L obtained according to step 3aWith Δ L, 1 diameter C of noise interference device is determined；
Step 5: according to the L of step 4aWith the value of Δ L, the of 1 target noise reduction frequency of noise interference device is calculated
Two basic frequency f0,2；
Step 6: the first basic frequency f obtained according to step 20,1The the second basic frequency f obtained with step 50,2, calculate
Obtain the first noise reduction subfrequency f of 1 target noise reduction frequency of noise interference deviceS1With the second noise reduction subfrequency fS2。
Wherein step 1 is specifically, the frequency f that the fan blade of kitchen ventilator generatesFIt is obtained by formula (I),
fF=β Ψ ω formula (I),
Wherein β=1/60, Ψ are the number of sheets of fan blade, and ω is the rotation speed of primary blades.
Wherein step 2 is specifically, generate frequency f according to the fan blade that step 1 obtainsF, made an uproar by formula (II)
First basic frequency f of 1 target noise reduction frequency of acoustic interference device0,1,
f0,1=dfFFormula (II),
Wherein d is noise reduction weight factor, and d is positive number, and d can be 0.1,5,10,21,10000 etc. any positive number.
Wherein step 3 is specifically, determine L by formula (III)aWith the value of Δ L,
Wherein t is the velocity of sound, and N is subfrequency multiple, acquires N by formula (IV),
N=(2p+1)/2 formula (IV),
Wherein p is multiple weight factor, and p is 0 or any positive integer, p can for 0,1,2 ... .10000 ... ..
∞。
Wherein La> Δ L.
It should be noted that a specific L can be first arranged in the present invention according to actual needsaOr Δ L, then it can obtain
To the range of another value, as long as meeting La> Δ L.
Wherein step 4 is specifically, the L obtained according to step 3aWith Δ L, C is obtained by formula (V),
Wherein step 5 is specifically, according to the L of step 4aValue with Δ L obtains noise interference device 1 by formula (VI)
Second basic frequency f of target noise reduction frequency0,2,
Wherein k is the ratio of time humorous frequency multiple, and k=2/3.
Wherein step 6 specifically,
Step 6.1, the first basic frequency f obtained according to step 20,11 target of noise interference device is obtained by formula (VII)
First noise reduction subfrequency f of noise reduction frequencys1,
fs1=[3f0,1,5f0,1,...........,xf0,1] formula (VII),
Wherein ∞ >=x >=2m+1, m=1,2,3....., ∞；
Step 6.2, the second basic frequency f obtained according to step 50,2, 1 target of noise interference device is obtained by formula (VIII)
Second noise reduction subfrequency f of noise reduction frequencys2,
fs2=[2f0,2,3f0,2,...........,yf0,2] formula (VIII),
Wherein ∞ >=y >=2.
It should be noted that being the first basic frequency f for the resonant frequency of the same noise interference device 10,1, the second dominant frequency
Rate f0,2, the first noise reduction subfrequency fs1With the second noise reduction subfrequency fs2.Therefore of the invention 1, noise interference device
Need the frequency f generated according to fan bladeF, the first basic frequency f of noise interference device 1 is obtained by calculation0,1, so as to
Obtain the L of noise interference device 1a, Δ L and C parameter.Work as La, after Δ L and C determine, the of the noise interference device 1 can be obtained
Two basic frequency f0,2, the first noise reduction subfrequency fs1With the second noise reduction subfrequency fs2, which can support
Disappear noise identical with above-mentioned resonant frequency.Simultaneously as noise waves enter noise interference device, done when noise waves leave noise
Relating to, which just will form after device, has dephased interference wave with the noise waves of main air duct, and interference wave makes the amplitude of remaining noise waves
Weaken or reduces.Therefore noise interference device, which can be realized, reduces the broadband noise waves that kitchen ventilator generates, and reaches maximum broadband
Noise reduction effect.
Noise of range hood wave is mainly based upon fan blade and generates frequency fF, frequency f is just generated when fan blade workF
Noise, while resonance can be generated inside kitchen ventilator to forming broadband noise waves.
1 principle of noise reduction of noise interference device of the invention are as follows: noise interference device 1 (Herschel-Quincke pipe) is root
According between sound wave resonance and interference achieve the effect that reduce sound.Because noise interference device 1 is with multiple resonant frequencies: the
One basic frequency f0,1, the second basic frequency f0,2, the first noise reduction subfrequency fs1With the second noise reduction subfrequency fs2.Kitchen ventilator
The broadband noise waves of generation are propagated in main air duct 2, and when encountering noise interference device, broadband noise waves are divided into first and have a lot of social connections
Frequency noise wave and second is had a lot of social connections frequency noise wave, and first via broadband noise waves and second have a lot of social connections frequency noise wave in main air duct
It is propagated in 2, when encountering noise interference device 1, the continuation of first via broadband noise waves is propagated in main air duct 2.It has a lot of social connections when second
Frequency noise wave has and the first basic frequency f0,1, the second basic frequency f0,2, the first noise reduction subfrequency fs1With the second noise reduction
Harmonic frequency fs2When same or similar frequency, the second frequency noise wave of having a lot of social connections enters noise interference device 1 and and noise interference
Device 1 resonates, and one of them from noise interference device 1 is open out and imports main air duct.It is passed from noise interference device 1
Second have a lot of social connections frequency noise wave of the first via broadband noise waves come after importing main air duct 2 with the propagation of main air duct 2 is broadcasted to deposit
In phase difference, first via broadband noise waves and the second frequency noise wave of having a lot of social connections interfere to form interference broadband noise waves,
Broadband noise waves are interfered to weaken relative to the amplitude of broadband noise waves, noise reduction.
The present invention carries out noise spectrum actual measurement to the kitchen ventilator that is obtained after being computed with noise interference device 1, such as with making an uproar
Sound collector carries out noise signal acquisition around kitchen ventilator, and collected live signal (time-domain) is then passed through quick Fu
Li Ye is changed turn after carry out from time-domain being transformed into frequency domain.The signal of frequency spectrum is obtained in frequency domain, to sentence noise interference dress
Set whether 1 carry out noise reduction to all or distinctive noise frequency.If having the decibel value of single or multiple frequencies in frequency spectrum
Higher than 40dB, then illustrate that the noise frequency is not eliminated or eradicating efficacy is bad, therefore can be by increasing multiple noises
Interference device 1 or the L for adjusting noise interference device 1a, Δ L and C be directed to these decibel values higher than 40dB specific noise frequency
Rate.
The wideband noise-reduction method with noise interference device kitchen ventilator, kitchen ventilator are provided with smoke machine main body and noise interference dress
It sets, noise interference device is assemblied in smoke machine main body.The resonant frequency and kitchen ventilator of noise interference device generate broadband when running
Noise waves overlapping.There are two opening, two openings are connected to the main air duct of smoke machine main body and two the setting of noise interference device respectively
The horizontal position of a opening is different.Noise interference device of the invention can generate frequency according to the fan blade of kitchen ventilator and carry out
Design, obtaining resonant frequency is the first basic frequency f0,1, the second basic frequency f0,2, the first noise reduction subfrequency fS1With the second noise reduction
Subfrequency fS2Noise interference device, therefore the noise interference device can offset make an uproar identical with above-mentioned resonant frequency
Sound.Simultaneously as noise waves enter noise interference device, just will form after noise waves leave noise interference device and main air duct
Noise waves have dephased interference wave, interference wave makes the amplitude of remaining noise waves weaken or reduce.Therefore noise interference
Device, which can be realized, reduces the broadband noise waves that kitchen ventilator generates, and reaches maximum broad-band noise-reducing effect.
Embodiment 2.
A kind of wideband noise-reduction method with noise interference device kitchen ventilator, as shown in fig. 6, other features and 1 phase of embodiment
Together, the difference is that: the noise interference device 1 of kitchen ventilator of the invention may be set to be it is multiple, such as 2,4,10,
500 or 10000 etc., specific noise interference device 1 according to the actual situation depending on.The present embodiment is specially 4.
Kitchen ventilator of the invention can be single value for the C of multiple noise interference devices 1, or multiple values.
LaIt can be single value, or multiple values.Δ L can be single value, or multiple values, specific LaWith Δ L value
Number according to the actual situation depending on.The L of this exampleaWith the specific multiple and different values of Δ L difference.
It should be noted that according to formula (III)It is found that for identical f0,1, LaAnd Δ
The value of L is simultaneously unique.That is for the first basic frequency f having the same0,1The parameter of noise interference device 1 can also be with
Difference, as long as LaMeet formula (III) with Δ L.
Work as LaWith Δ L specifically multiple and different values when, the first basic frequency f of multiple noise interference devices 10,1It is possible that it is different,
As the first basic frequency f0,1When different, the second basic frequency f0,2, the first noise reduction subfrequency fs1With the second noise reduction subfrequency
fs2Also different.The frequency model of multiple noise interference devices 1 is wider compared with Example 1, so that wideband noise reduction be better achieved.
Embodiment 3.
A kind of wideband noise-reduction method with noise interference device kitchen ventilator, other features are same as Example 1, difference
It is: the L of the present embodimentaSpecially 10cm, Δ L are specially 3cm, C 0.18cm.
Phase difference of the invention can be 150 °~180 °.When phase difference is 180 °, interference effect is best.
Compared with Example 1, the L of the noise interference device 1 of the present embodimenta, Δ L, C specific value, have the noise
The kitchen ventilator of interference device 1 has the advantages that noise reduction is good.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention
The limitation of range, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should be managed
Solution, can be with modifying or equivalently replacing the technical solution of the present invention, without departing from the essence and model of technical solution of the present invention
It encloses.
Claims (12)
1. a kind of wideband noise-reduction method with noise interference device kitchen ventilator, it is characterised in that: kitchen ventilator is provided with smoke machine main body
With noise interference device, noise interference device is assemblied in smoke machine main body；
The broadband noise waves that the resonant frequency of the noise interference device generates when running with kitchen ventilator are Chong Die；
There are two openings for the noise interference device setting, and two openings are connected to respectively with the main air duct of smoke machine main body and two are opened
The horizontal position of mouth is different；
The broadband noise waves are propagated in main air duct, and when encountering noise interference device, broadband noise waves are divided into the first via
Broadband noise waves and second are had a lot of social connections frequency noise wave, and the continuation of first via broadband noise waves is propagated in main air duct；Second tunnel
Broadband noise waves enter noise interference device and resonate with noise interference device, and from wherein the one of noise interference device
A opening, which comes out, imports main air duct；
The propagated after importing main air duct with main air duct from the first via broadband noise waves that noise interference device propagates from
Two have a lot of social connections frequency noise wave there are phase difference, and first via broadband noise waves and the second frequency noise wave of having a lot of social connections interfere to be formed
Interfere broadband noise waves, interference broadband noise waves weaken relative to the amplitude of broadband noise waves, noise reduces.
2. the wideband noise-reduction method according to claim 1 with noise interference device kitchen ventilator, it is characterised in that: it is described total
Vibration frequency is the first basic frequency f0,1, the second basic frequency f0,2, the first noise reduction subfrequency fS1With the second noise reduction subfrequency
fS2。
3. the wideband noise-reduction method according to claim 2 with noise interference device kitchen ventilator, it is characterised in that: it is described to make an uproar
Steps are as follows for the resonant frequency acquisition of acoustic interference device:
Step 1: the fan blade for obtaining kitchen ventilator generates frequency fF；
Step 2: generating frequency f according to the fan blade that step 1 obtainsF, determine the of noise interference device target noise reduction frequency
One basic frequency f0,1；
Step 3: the first basic frequency f obtained according to step 20,1, determine the length L of noise interference deviceaIt is open with two
Shortest distance Δ L；
Step 4: the L obtained according to step 3aWith Δ L, noise interference assembly dia C is determined；
Step 5: according to the L of step 4aWith the value of Δ L, the second dominant frequency of noise interference device target noise reduction frequency is calculated
Rate f0,2；
Step 6: the first basic frequency f obtained according to step 20,1The the second basic frequency f obtained with step 50,2, it is calculated
First noise reduction subfrequency f of noise interference device target noise reduction frequencyS1With the second noise reduction subfrequency fS2。
4. the wideband noise-reduction method according to claim 3 with noise interference device kitchen ventilator, it is characterised in that: the step
Rapid one specifically, the frequency f that the fan blade of kitchen ventilator generatesFIt is obtained by formula (I),
fF=β Ψ ω formula (I),
Wherein β=1/60, Ψ are the number of sheets of fan blade, and ω is the rotation speed of primary blades.
5. the wideband noise-reduction method according to claim 4 with noise interference device kitchen ventilator, it is characterised in that: the step
Rapid two specifically, generate frequency f according to the fan blade that step 1 obtainsF, noise interference device target is obtained by formula (II)
First basic frequency f of noise reduction frequency0,1,
f0,1=dfFFormula (II),
Wherein d is noise reduction weight factor, and d is positive number.
6. the wideband noise-reduction method according to claim 5 with noise interference device kitchen ventilator, it is characterised in that: the step
Rapid three specifically, determine L by formula (III)aWith the value of Δ L,
Wherein t is the velocity of sound, and N is subfrequency multiple, acquires N by formula (IV),
N=(2p+1)/2 formula (IV),
It is wherein p is multiple weight factor, and p is 0 or any positive integer.
7. the wideband noise-reduction method according to claim 6 with noise interference device kitchen ventilator, it is characterised in that: the La
> Δ L.
8. the wideband noise-reduction method according to claim 7 with noise interference device kitchen ventilator, it is characterised in that: the step
Rapid four specifically, the L obtained according to step 3aWith Δ L, C is obtained by formula (V),
9. the wideband noise-reduction method according to claim 8 with noise interference device kitchen ventilator, it is characterised in that: the step
Rapid five specifically, according to the L of step 4aWith the value of Δ L by formula (VI), the of noise interference device target noise reduction frequency is obtained
Two basic frequency f0,2,
Wherein k is the ratio of time humorous frequency multiple, and k=2/3.
10. the wideband noise-reduction method according to claim 9 with noise interference device kitchen ventilator, it is characterised in that: it is described
Step 6 specifically,
Step 6.1, the first basic frequency f obtained according to step 20,1Noise interference device target noise reduction frequency is obtained by formula (VII)
First noise reduction subfrequency f of rates1,
fs1=[3f0,1,5f0,1,...........,xf0,1] formula (VII),
Wherein ∞ >=x >=2m+1, m=1,2,3....., ∞；
Step 6.2, the second basic frequency f obtained according to step 50,2, noise interference device target noise reduction is obtained by formula (VIII)
Second noise reduction subfrequency f of frequencys2,
fs2=[2f0,2,3f0,2,...........,yf0,2] formula (VIII),
Wherein ∞ >=y >=2.
11. the wideband noise-reduction method according to claim 10 with noise interference device kitchen ventilator, it is characterised in that: it is described
Noise interference device is provided with multiple；
The C is single value or multiple values；
The LaFor single value or multiple values；
The Δ L is single value or multiple values.
12. the wideband noise-reduction method according to claim 11 with noise interference device kitchen ventilator, it is characterised in that: it is described
Phase difference is 150 °~180 °.
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| CN107542668A (en) * | 2017-09-11 | 2018-01-05 | 珠海格力电器股份有限公司 | Denoising device, compressor and air conditioner |
| CN108731081A (en) * | 2018-07-14 | 2018-11-02 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator with noise filtering function exhausting component |
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| CN107542668A (en) * | 2017-09-11 | 2018-01-05 | 珠海格力电器股份有限公司 | Denoising device, compressor and air conditioner |
| CN108731081A (en) * | 2018-07-14 | 2018-11-02 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator with noise filtering function exhausting component |
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