CN108731073B - Lampblack absorber with lampblack separation device and noise reduction method - Google Patents

Lampblack absorber with lampblack separation device and noise reduction method Download PDF

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Publication number
CN108731073B
CN108731073B CN201810772839.5A CN201810772839A CN108731073B CN 108731073 B CN108731073 B CN 108731073B CN 201810772839 A CN201810772839 A CN 201810772839A CN 108731073 B CN108731073 B CN 108731073B
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noise
noise reduction
smoke
dimensional space
main body
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CN108731073A (en
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陈小平
林勇进
李健鹏
李思成
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Foshan Viomi Electrical Technology Co Ltd
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Foshan Viomi Electrical Technology Co Ltd
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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
    • 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
    • F24C15/2035—Arrangement or mounting of filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

A range hood with a lampblack separator and a noise reduction device and a noise reduction method are provided with a lampblack absorber main body, a three-dimensional space sound field noise reduction device for actively reducing noise and a lampblack separator for absorbing and separating lampblack particles, wherein the three-dimensional space sound field noise reduction device is assembled inside the lampblack absorber main body, and the lampblack separator is assembled inside the lampblack absorber main body in a transmission way. The three-dimensional space sound field noise reduction device is provided with a noise acquisition sensor and a noise reduction main body, wherein the noise acquisition sensor is used for detecting the noise source decibels in the main body of the smoke machine. The noise signals are decomposed into a plurality of subband signals, the subband signals are converted to obtain band-pass filter weight vectors, the obtained band-pass filter weight vectors are converted to generate corresponding loudspeaker sound fields, the equal-intensity sound wave signals are transmitted to corresponding loudspeakers, and noise waves generated by the range hood are reduced or offset through sound waves generated by the corresponding loudspeakers, so that noise reduction is realized. The range hood solves the technical difficulty that the noise and the performance are mutually contradictory, and on the premise of not sacrificing the performance of the range hood for sucking the oil smoke, the noise generated when the range hood operates is relatively low and the negative influence of the user on physiology and psychology is not caused.

Description

Lampblack absorber with lampblack separation device and noise reduction method
Technical Field
The invention relates to the field of range hoods, in particular to a range hood with a range hood separation device and a noise reduction method.
Background
The current active noise reduction technology, such as the point-to-point noise reduction technology applied to headphones, i.e. directional noise reduction, cannot effectively eliminate noise with a large range. These techniques focus on eliminating planar acoustic waves in one dimension within a closed small pipe or space, which is effective at low frequency ranges (less than 500 Hz). In order to realize low noise, the current smoke exhaust ventilator generally directly sets low air quantity, namely, the performance of smoke exhaust of the smoke exhaust ventilator is sacrificed to realize low noise, but the smoke exhaust effect is greatly reduced; in addition, some active noise reduction devices are arranged, but the active noise reduction devices can only reduce the noise within 1000Hz, and cannot be suitable for high-order acoustic modes. However, in three dimensions, higher order acoustic modes cannot be ignored, and noise reduction is very difficult and complex, especially in closed large space ducts. Under the normal condition, a plurality of standing waves and sound waves in different directions are mutually interfered and overlapped, so that the difficulty of three-dimensional space noise reduction is greatly increased.
Therefore, in order to solve the deficiencies of the prior art, it is necessary to provide a range hood with a fume separation device and a noise reduction method.
Disclosure of Invention
One of the purposes of the invention is to provide a range hood with a fume separation device and a noise reduction device, which avoids the defects of the prior art. The range hood with the oil smoke separation device and the noise reduction device achieves optimization of the performance of the range hood through the three-dimensional space sound field noise reduction device, and meanwhile works under low-noise operation, so that the technical difficulty that the noise and the performance are contradictory is solved.
The above object of the present invention is achieved by the following means.
The utility model provides a take lampblack absorber of lampblack absorber and noise reduction device is provided with the lampblack absorber main part, is used for initiatively reducing the three-dimensional space sound field noise reduction device and is used for absorbing and separating lampblack particle's lampblack separation device, and three-dimensional space sound field noise reduction device assembles inside the lampblack absorber main part, and lampblack separation device transmission assembles inside the lampblack absorber main part.
The smoke ventilator main body is provided with a smoke ventilator main board for controlling the operation of the smoke ventilator, and the smoke ventilator main board is electrically connected with the three-dimensional space sound field noise reduction device.
The main board of the smoke machine detects the working state of the main body of the smoke machine, when the working state is higher than a threshold value, the main board of the smoke machine transmits an indication signal to the three-dimensional space sound field noise reduction device, and the three-dimensional space sound field noise reduction device receives the indication signal and starts noise reduction work.
Preferably, the smoke ventilator main board detects the rotating speed of the oil smoke separation device, when the rotating speed of the oil smoke separation device is higher than a first threshold value, the smoke ventilator main board transmits an indication signal to the three-dimensional space sound field noise reduction device, and the three-dimensional space sound field noise reduction device receives the indication signal and starts noise reduction work.
Preferably, the cigarette machine main body is further provided with a rectifying plate, and the rectifying plate is assembled on the cigarette machine main body.
Preferably, the cigarette machine main board detects the telescopic length of the rectifying board, and when the telescopic length of the rectifying board is higher than a second threshold value, the cigarette machine main board transmits an indication signal to the three-dimensional space sound field noise reduction device, receives the indication signal and starts noise reduction work.
Preferably, the first threshold is 100 to 10000rpm/min.
Preferably, the second threshold value is 0 to 30cm.
Further preferably, the first threshold is 800 to 2000rpm/min.
More preferably, the second threshold value is 2 to 5cm.
Preferably, the three-dimensional space sound field noise reduction device is provided with a three-dimensional space sound field noise reduction unit and an adaptive noise reduction control unit, the adaptive noise reduction control unit is electrically connected with the three-dimensional space sound field noise reduction unit, and the three-dimensional space sound field noise reduction unit and the adaptive noise reduction control unit are respectively assembled on the main body of the smoke machine.
Preferably, the three-dimensional space sound field noise reduction unit is provided with a fixing frame, a noise collection sensor, a loudspeaker and an acoustic resonance box, wherein the fixing frame is assembled inside the smoke machine main body, the loudspeaker is installed inside the acoustic resonance box, the acoustic resonance box is fixedly assembled on the fixing frame and located below the oil smoke separation device, the noise collection sensor is fixedly installed on the surface of the fixing frame, and the noise collection sensor and the loudspeaker are respectively electrically connected with the self-adaptive noise reduction control unit.
Preferably, the adaptive noise reduction control unit is configured as a band-pass filter, the band-pass filter is assembled inside the smoke ventilator main body, and the noise collection sensor and the speaker are electrically connected with the band-pass filter respectively.
The band-pass filter receives the indication signal of the main board of the smoke machine and starts noise reduction.
Preferably, the main body of the smoke machine is provided with a low-damping air box for reducing broadband vibration, the low-damping air box is assembled inside the main body of the smoke machine, and the oil smoke separating device is assembled inside the low-damping air box in a transmission way.
Preferably, the low damping bellows is provided with a plurality of bellows plates and a noise filtering device, the bellows plates are spliced into a three-dimensional structure, the noise filtering device is assembled on the inner surface of the bellows plates, and the fixing frame is assembled below the low damping bellows.
Preferably, the oil smoke separation device is positioned in a full-surrounding structure formed by a filter screen of the air inlet and a low-damping bellows, and the three-dimensional space sound field noise reduction unit is positioned outside the full-surrounding structure; or alternatively
The oil fume separating device is positioned in a semi-enclosed structure which is formed by a low-damping bellows and has at least two completely open structural surfaces.
The range hood disclosed by the invention is used for decomposing a noise signal into a plurality of subband signals, converting the subband signals to obtain the weight vector of the band-pass filter, converting the obtained weight vector of the band-pass filter to generate a corresponding loudspeaker sound field, transmitting an equal-intensity sound wave signal to a corresponding loudspeaker, and reducing or counteracting noise sound waves generated by the range hood through sound waves generated by the corresponding loudspeaker.
Preferably, the self-adaptive noise reduction control unit is further provided with an error return sensor, wherein the error return sensor is fixedly installed inside the smoke machine main body and below the low damping bellows, and the error return sensor is electrically connected with the band-pass filter.
Preferably, the error return sensor is located below the speaker.
Preferably, K speakers and acoustic resonance boxes are arranged, K is larger than or equal to 1, K is a positive integer, and the speakers and the acoustic resonance boxes are in one-to-one correspondence.
Preferably, the cone or the diaphragm of the loudspeaker faces the air inlet of the cigarette machine main body, is parallel to the air inlet or forms an included angle beta, and the beta is less than or equal to 60 degrees.
Preferably, the number of the noise collecting sensors is A, A is more than or equal to 4, A is a positive integer, and A is more than or equal to K.
Preferably, the number of the error feedback sensors is Q, Q is a positive integer, and Q is more than or equal to 1.
Preferably, the noise collection sensor is located above the speaker.
Preferably, the number of the band pass filters is D, and D is a positive integer.
Preferably, the noise filtering device is a low damping noise filter plate.
Preferably, the low damping noise filter plate is provided with a panel body and a reinforcing structure, wherein the panel body and the reinforcing structure are distributed with a plurality of through holes for eliminating noise, and the reinforcing structure is fixed on the panel body.
Preferably, the reinforcing structure is at least one of reinforcing ribs, rivets, guide edges, fixing frames, grooves or convex hulls.
Preferably, the noise filter device is provided with a sound absorbing portion, and the sound absorbing portion is fitted between the low-damping noise filter plate and the wall surface of the low-damping bellows.
Preferably, the outer surface of the low damping bellows is provided with a foam board, an asphalt board or a rubber board.
The noise reduction frequency range of the three-dimensional space sound field noise reduction device is 100 Hz-2000 Hz.
The invention relates to a noise reduction method of a range hood, which comprises the following steps:
step one, determining and fixing the positions of A noise acquisition sensors, Q error return sensors and K loudspeakers;
step two, determining a transfer function T1 from an initial noise source to a noise acquisition sensor, a transfer function T2 from a loudspeaker to a target noise reduction space and a transfer function T3 from the noise acquisition sensor to the target noise reduction space;
step three, A noise collecting sensors collect noise collecting sensor signals of the area in the space in the smoke machine respectively, specifically R 1 (n)，......，R i (n),......,R A (n), i is more than or equal to 4 and less than or equal to A, i is a positive integer,
q error return noise sensors collect signals of the error return noise sensors in the area, specifically epsilon 1 (n)，......,ε v (n),......,ε Q (n), v is more than or equal to 1 and less than or equal to Q, v and Q are positive integers;
step four, converting the noise acquisition sensor signals collected by the A noise acquisition sensors obtained in the step three into R (n) = [ R) 1 (n)......R i (n).......R A (n)]The signals of the error feedback sensors after the correction of the Q noise acquisition sensors are converted into epsilon (n) = [ epsilon ] 1 (n)......ε v (n)......ε Q (n)]；
Fifthly, R (n) in the fourth step is corrected to be in a formula (I)
Step six, D band-pass filters of the three-dimensional space noise reduction control unit are used for obtaining the three-dimensional space noise reduction control unitCorrespondingly decomposed into L subbands: r is (r) 1 (k)，......，r g (k)，......，r L (k) Decomposing the correspondence obtained in the fourth step into L sub-bands: e, e 1 (k)，......，e g (k)，......，e L (k) L is more than or equal to g is more than or equal to 2, and L and g are positive integers;
seventh, the sub-band r obtained in the sixth step is obtained 1 (k)，......，r g (k)，......，r L(k) and e1 (k)，......，e g (k)，......，e L (k) Calculating self-adaptive weight coefficient w of L sub-bands through filtering X least mean square 1 (k)，......，w g (k)，......，w L (k) W (K) is a matrix of kxaxd, r (K) is q× (axkxd), e (K) is a matrix of q×d;
step eight, L sub-band self-adaptive weight coefficients w of the D band-pass filters 1 (k)，......，w g (k)，......，w L (k) Performing a fast Fu Lilie conversion to l×z bands, where Z is a matrix of kxaxd;
step nine, superposing the L multiplied by Z frequency bands obtained in the step eight through a frequency superposition method to form a unique A multiplied by K matrix signal frequency;
step ten, performing Fourier inverse transformation on the frequency of the AxK matrix signal obtained in the step nine to obtain a weight vector Wij (n) of the band-pass filter, wherein j is more than or equal to 1 and less than or equal to K, and i is more than or equal to 4 and less than or equal to A;
step eleven, the step ten is carried out to obtain a weight vector W of the band-pass filter ij (n) converting to generate K speaker sound fields, the K speaker sound fields respectively corresponding to S 1 (n)，.....，S j (n)，.....,S K (n) wherein 1.ltoreq.j.ltoreq.K, and acquiring an initial noise source R by a noise sensor according to the formula (II) i (n) and bandpass filter weight vector W ji Product of (n) to estimate final noise field S of j-th speaker output signal j (n)，
wherein ,is W ij The transposed matrix of (n), R i (n) through T 2 Transposed matrix after transfer function, S j (n) equal intensity acoustic wave signal 180 DEG opposite to noise sourceA number;
step twelve, the equal-intensity sound wave signal S 1 (n)，.....，S j (n)，.....,S K (n) respectively and correspondingly transmitting the signals to K speakers;
thirteenth, the error returns the sensor detection effect, iterates and corrects the self-adaptive weight coefficient to obtain the final self-adaptive weight coefficient meeting the requirement and obtain S j ' (n), go to step fourteen;
step fourteen, S j (n) is that the final equal-intensity sound wave signals are correspondingly transmitted to the corresponding speakers;
the performance of the three-dimensional noise reduction model is supervised by the representation of the cost function of the full band of (III) with the mean square error of the error sensor signal,
where n is the iteration index through the adaptive algorithm;
the said wherein εv (n)＝A(n)+S j (n)·T 2 Wherein A (n) is a final noise field formed by the initial noise source after being transmitted in the internal space of the smoke machine;
the step thirteen specifically comprises the steps of,
step 13.1, presetting a noise value Γ (n) =c of the error-feedback noise sensor, wherein C is the noise value of the region where the error-feedback noise sensor measures, and determining Γ (n) and [ A (n) -S j (n)T 2 ] 2 When [ A (n) -S j (n)T 2 ] 2 When > C, go to step 13.2 when [ A (n) -S j (n)T 2 ] 2 When C is less than or equal to C, entering a step 13.4;
step 13.2, w 1 (k)，......，w g (k)，......，w L (k) Respectively substituting Into (IV) to respectively obtain new w 1 (k+1)，......，w g (k+1)，......，w L L adaptations of (k+1)The step 13.3 is entered by taking the weight coefficient, mu as the convergence factor,
w (k+1) =w (k) + [ μr (k) e (k) ] formula (iv);
step 13.3, let w 1 (k+1)＝w1(k)，......，w g (k+1)＝w g (k)，......，w L (k+1)＝w L (k) Respectively as the weight vectors of the filters, and entering a step eight;
step 13.4, let S j (n)＝S j ' (n), go to step fourteen;
the C value ranges from-0.001 dB to 0.001dB.
Another object of the present invention is to provide a noise reduction method for a range hood with a fume separation device and a noise reduction device, by using the noise reduction method.
The invention relates to a range hood with a lampblack separator and a noise reducer, which is provided with a main body of the range hood, a three-dimensional space sound field noise reducer for actively reducing noise and a lampblack separator for absorbing and separating lampblack particles, wherein the three-dimensional space sound field noise reducer is assembled in the main body of the range hood, and the lampblack separator is assembled in the main body of the range hood in a transmission way. The smoke ventilator main body is provided with a smoke ventilator main board for controlling the operation of the smoke ventilator, and the smoke ventilator main board is electrically connected with the three-dimensional space sound field noise reduction device. The main board of the smoke machine detects the working state of the main body of the smoke machine, when the working state is higher than a threshold value, the main board of the smoke machine transmits an indication signal to the three-dimensional space sound field noise reduction device, and the three-dimensional space sound field noise reduction device receives the indication signal and starts noise reduction work. The range hood disclosed by the invention is used for decomposing a noise signal into a plurality of subband signals, converting the subband signals to obtain the weight vector of the band-pass filter, converting the obtained weight vector of the band-pass filter to generate a corresponding loudspeaker sound field, transmitting an equal-intensity sound wave signal to a corresponding loudspeaker, and reducing or counteracting noise sound waves generated by the range hood through sound waves generated by the corresponding loudspeaker. The range hood is provided with a hood main body and a three-dimensional space sound field noise reduction device for actively reducing noise, wherein the three-dimensional space sound field noise reduction device is assembled inside the hood main body. The low damping bellows of the present invention can make the incident wave and the reflected wave have different phases at a specific distance from the reflecting surface, so that the sound waves of the noise can cancel each other, thereby reducing the intensity of the noise. The full-surrounding structure or the half-surrounding structure can optimize the performance of the smoke machine, but can finish the work under the low-noise operation at the same time, solve the technical difficulty that the noise and the performance are contradictory, and on the premise of not sacrificing the performance of the smoke suction of the smoke machine, the noise generated when the smoke machine operates is relatively low and does not cause negative physiological and psychological effects of users. Meanwhile, the invention designs and optimizes the specific installation position of the three-dimensional space sound field noise reduction device in the smoke machine, and obtains the most effective noise reduction effect and the effective noise reduction space range. Furthermore, the range hood noise reduction method with the oil smoke separation device and the noise reduction device is mainly characterized in that a plurality of sub-band signal processing methods are adopted and a filter least mean square (F-XLMS) algorithm is combined, so that a large number of calculations can be effectively reduced, and the three-dimensional space noise reduction effect is improved. Meanwhile, the calculated amount is inversely proportional to the number of the sub-bands, so that the stability of the system can be enhanced and the system can be quickly converged. Another advantage of this approach is that the delay of the signal can be removed, improving the overall noise reduction.
Drawings
The invention is further illustrated by the accompanying drawings, which are not to be construed as limiting the invention in any way.
Fig. 1 is a signal transmission relation of a range hood with a fume separation device and a noise reduction device.
Fig. 2 is a structural perspective view of embodiment 1.
Fig. 3 is a side view of fig. 2.
Fig. 4 is a schematic diagram of the structure of the oil smoke separating device.
Fig. 5 is an exploded schematic view of the three-dimensional spatial sound field noise reduction unit.
FIG. 6 is a schematic perspective view of a low damping bellows.
Fig. 7 is a schematic structural diagram of a noise filtering device.
FIG. 8 is a top view of a low damping bellows.
FIG. 9 is a front view of a low damping bellows.
Fig. 10 is a schematic diagram of the included angle between the speaker and the air inlet.
Fig. 11 is a schematic view of a low damping bellows, in which fig. 11 a is a fully enclosed structure, fig. 11B is another angle of fig. 11 a, fig. 11C is a semi-enclosed structure, and fig. 11D is another angle of fig. 11C.
Fig. 12 is a schematic signal flow diagram of a noise reduction signal processing method according to the present invention.
Fig. 13 is a schematic diagram of a bandpass filter processing noise acquisition sensor signals and error return sensors.
In fig. 1 to 13, the method includes:
a main body 1 of the cigarette making machine,
Low damping bellows 11, noise filter 111, sound absorber 112, reinforcing structure 113, through hole 114, filter screen 115,
A fume separator 12,
A rectifying plate 13,
A three-dimensional space sound field noise reduction device 2,
A noise collection sensor 221, a speaker 222, an acoustic resonance box 223, a fixing frame 224,
An adaptive noise reduction control unit 23, a band-pass filter 231, an error return sensor 232,
And a kitchen range 3.
Detailed Description
The technical scheme of the invention is further described with reference to the following examples.
Example 1.
As shown in fig. 1 to 10, the range hood with the oil smoke separating device 12 and the noise reducing device is provided with a main body 1 of the range hood, a three-dimensional space sound field noise reducing device 2 for actively reducing noise and the oil smoke separating device 12 for absorbing and separating oil smoke particles, wherein the three-dimensional space sound field noise reducing device 2 is assembled inside the main body 1 of the range hood, and the oil smoke separating device 12 is assembled inside the main body 1 of the range hood in a transmission way. The smoke ventilator main body 1 is provided with a smoke ventilator main board for controlling the operation of the smoke ventilator, and the smoke ventilator main board is electrically connected with the three-dimensional space sound field noise reduction device 2.
The main board of the smoke machine detects the working state of the main body 1 of the smoke machine, when the working state is higher than a threshold value, the main board of the smoke machine transmits an indication signal to the three-dimensional space sound field noise reduction device 2, and the three-dimensional space sound field noise reduction device 2 receives the indication signal and starts noise reduction work.
The smoke ventilator main board detects the rotating speed of the oil smoke separation device 12, when the rotating speed of the oil smoke separation device 12 is higher than a first threshold value, the smoke ventilator main board transmits an indication signal to the three-dimensional space sound field noise reduction device 2, and the three-dimensional space sound field noise reduction device 2 receives the indication signal and starts noise reduction work. The first threshold value of the present invention is 100-10000 rpm/min, wherein the first threshold value is preferably 800-2000 rpm/min, and the first threshold value of this embodiment is 800rpm/min.
The main body 1 of the range hood is also provided with a rectifying plate 13, and the rectifying plate 13 is assembled on the main body 1 of the range hood. The cigarette machine main board detects the flexible length of rectifying board 13, and when the flexible length of rectifying board 13 is higher than the second threshold, cigarette machine main board transmission instruction signal is to three-dimensional space sound field noise reduction device 2, and three-dimensional space sound field noise reduction device 2 receives the instruction signal and begins the work of making an uproar falls. The second threshold of the present invention is 0-30 cm, wherein the second threshold is preferably 2-5 cm, and the second threshold of the present embodiment is 3cm.
The first threshold value and the second threshold value are set, so that the operation of the noise reduction main body when the smoke machine main body 1 generates a smaller noise source under the condition of less oil smoke can be avoided, and the service life of the noise reduction main body can be prolonged, and the energy can be saved.
The three-dimensional space sound field noise reduction device 2 is provided with a three-dimensional space sound field noise reduction unit and an adaptive noise reduction control unit 23, the adaptive noise reduction control unit 23 is electrically connected with the three-dimensional space sound field noise reduction unit, and the three-dimensional space sound field noise reduction unit 22 and the adaptive noise reduction control unit 23 are respectively assembled on the smoke machine main body 1.
The three-dimensional space sound field noise reduction unit is provided with a fixing frame 224, a noise collection sensor 221, a loudspeaker 222 and an acoustic resonance box 223, wherein the fixing frame 224 is assembled inside the smoke machine main body 1, the loudspeaker 222 is installed inside the acoustic resonance box 223, the acoustic resonance box 223 is fixedly assembled on the fixing frame 224 and is located below the oil smoke separation device 12, the noise collection sensor 221 is fixedly installed on the surface of the fixing frame 224, and the noise collection sensor 221 and the loudspeaker 222 are respectively electrically connected with the self-adaptive noise reduction control unit 23.
The adaptive noise reduction control unit 23 is provided as a band pass filter 231, the band pass filter 231 is fitted inside the range hood body 1, and the noise collection sensor 221 and the speaker 222 are electrically connected to the band pass filter 231, respectively. The band pass filter 231 receives an indication signal of the main board of the smoke machine and starts noise reduction.
The range hood main body 1 is provided with a low damping bellows 11 for reducing broadband vibration, the low damping bellows 11 is assembled inside the range hood main body 1, and the oil smoke separating device 12 is assembled inside the low damping bellows 11 in a transmission manner.
The low damping bellows 11 is provided with a plurality of bellows plates and a noise filter 111, the bellows plates are spliced into a three-dimensional structure, the noise filter 111 is assembled on the inner surface of the bellows plates, and the fixing frame 224 is assembled below the low damping bellows 11.
The soot separating device 12 of the present embodiment is located inside a half-enclosed structure having at least two structural surfaces that are completely open and constituted by the low damping bellows 11, as shown by C in fig. 6, 11 and D in fig. 11.
The range hood provided by the invention decomposes a noise signal into a plurality of subband signals, converts the subband signals into the weight vector of the band-pass filter 231, converts the obtained weight vector of the band-pass filter 231 to generate a corresponding loudspeaker 222 sound field, transmits an equal-intensity sound wave signal to the corresponding loudspeaker 222, and reduces or counteracts noise sound waves generated by the range hood through sound waves generated by the corresponding loudspeaker 222 to realize noise reduction.
The adaptive noise reduction control unit 23 is further provided with an error return sensor 232, the error return sensor 232 is fixedly installed inside the smoke machine body 1 and below the low damping bellows 11, and the error return sensor 232 is electrically connected with the band-pass filter 231. The error return sensor 232 is located below the speaker 222.
The speaker 222 of the present invention is used to receive the signal of the adaptive noise reduction control unit 23 and generate sound waves 180 ° inverted from the noise source. The error feedback sensor 232 is used for detecting the performance of the adaptive noise reduction control unit 23, and the algorithm of the adaptive noise reduction control unit 23 performs signal feedback on the three-dimensional space sound field noise reduction unit 22.
The three-dimensional space sound field noise reduction unit is configured to decompose a signal of the noise acquisition sensor 221 or a signal of the error return sensor 232 into a plurality of subbands, receive a wave frequency of a noise source transmitted by the noise acquisition sensor 221 and a signal of the error return sensor 232, perform an operation, and output a signal to the speaker 222.
The number of the speakers 222 and the acoustic resonance boxes 223 is K, K is larger than or equal to 1, K is a positive integer, and the speakers 222 and the acoustic resonance boxes 223 are in one-to-one correspondence. The cone or diaphragm of the speaker 222 faces the air inlet of the main body 1 of the cigarette machine, and is parallel to or forms an included angle beta with the air inlet, and beta is less than or equal to 60 degrees. The speaker 222 and the acoustic resonance box 223 of the present embodiment are each specifically provided in 2.
The number of the noise collecting sensors 221 of the present invention is A, A is not less than 4, A is a positive integer, A is not less than K, and the number of the noise collecting sensors 221 of the present embodiment is specifically 4.
The number of the error feedback sensors 232 is Q, Q is a positive integer, Q is more than or equal to 1, and the number of the error feedback sensors 232 in the embodiment is specifically 2.
The noise collecting sensor 221 is located above the speaker 222, and the bandpass filters 231 are provided with D, which is a positive integer. The band pass filters 231 of the present embodiment are provided in 4.
Note that, the number of speakers 222 according to the present invention may be 2, or may be any positive integer; the number of the noise collection sensors 221 may be 4, or may be any positive integer greater than 4; the number of the error return sensors 232 may be 2, or may be any positive integer; the number of the band pass filters 231 of the present invention may be 4, or may be any positive integer, and the specific implementation is according to the actual situation.
The noise filtering device 111 is a low-damping noise filter plate provided with a panel body in which a plurality of noise-canceling through holes 114 are distributed and a reinforcing structure 113, and the reinforcing structure 113 is fixed to the panel body. The reinforcing structure 113 of the present invention is at least one of a reinforcing rib, a rivet, a guide edge, a fixing frame 224, a groove or a convex hull. The noise filter device 111 is provided with a sound absorbing portion 112, and the sound absorbing portion 112 is fitted between the low-damping noise filter plate and the wall surface of the low-damping bellows 11. The reinforcing structure of this embodiment is a reinforcing rib.
It should be noted that the reinforcement structure of the present invention may be a rivet, a guiding edge, a fixing frame 224, a groove or a convex hull, or may be any combination of various combinations, and the specific embodiment depends on the actual situation.
The function of the reinforcing structure is to enhance the rigidity of the low damping noise filter plate.
The principle of the invention is as follows: the main board of the smoke machine detects the working state of the main body 1 of the smoke machine, when the working state is higher than a threshold value, the main board of the smoke machine transmits an indication signal to the three-dimensional space sound field noise reduction device 2, and the three-dimensional space sound field noise reduction device 2 receives the indication signal and starts noise reduction work. When the rotating speed of the smoke separation device 12 or the telescopic length of the rectifying plate 13 is detected by the smoke machine main board, and when the rotating speed of the smoke separation device 12 or the working condition of the rectifying plate 13 is higher than a threshold value, an indication signal is transmitted to the three-dimensional space sound field noise reduction device 2 by the smoke machine main board, the three-dimensional space sound field noise reduction device 2 receives the indication signal and starts noise reduction work, and sound waves which are 180 degrees opposite to an internal noise source are generated to offset the sound waves, so that the purpose of noise reduction is achieved. When the noise generated by the range hood contacts the full-or half-enclosure structure of the low damping bellows 11, most of the incident wave propagating in the opposite direction interferes with the reflected wave. Meanwhile, the resonance principle of the range hood of the invention is used for noise reduction, when the noise resonates with the natural frequency of the low damping bellows 11, and when the resonance occurs, the oscillated sound wave can forcefully penetrate back and forth into the through hole 114 in the air, and the sound energy of the noise is converted into friction loss in the process, so that the noise of the target frequency is eliminated.
The range hood with the oil smoke separation device 12 and the noise reduction device is provided with a hood body 1, a three-dimensional space sound field noise reduction device 2 for actively reducing noise and the oil smoke separation device 12 for absorbing and separating oil smoke particles, wherein the three-dimensional space sound field noise reduction device 2 is assembled inside the hood body 1, and the oil smoke separation device 12 is assembled inside the hood body 1 in a transmission way. The smoke ventilator main body 1 is provided with a smoke ventilator main board for controlling the operation of the smoke ventilator, and the smoke ventilator main board is electrically connected with the three-dimensional space sound field noise reduction device 2. The main board of the smoke machine detects the working state of the main body 1 of the smoke machine, when the working state is higher than a threshold value, the main board of the smoke machine transmits an indication signal to the three-dimensional space sound field noise reduction device 2, and the three-dimensional space sound field noise reduction device 2 receives the indication signal and starts noise reduction work. The range hood provided by the invention decomposes a noise signal into a plurality of subband signals, converts the subband signals into the weight vector of the band-pass filter 231, converts the obtained weight vector of the band-pass filter 231 to generate a corresponding loudspeaker 222 sound field, transmits an equal-intensity sound wave signal to the corresponding loudspeaker 222, and reduces or counteracts noise sound waves generated by the range hood through sound waves generated by the corresponding loudspeaker 222 to realize noise reduction. The low damping bellows 11 of the range hood can enable the incident wave and the reflected wave to have different phases at a specific distance from the reflecting surface, so that sound waves of noise can cancel each other, and the intensity of the noise is reduced. The full-surrounding structure or the half-surrounding structure can optimize the performance of the smoke machine, but can finish the work under the low-noise operation at the same time, solve the technical difficulty that the noise and the performance are contradictory, and on the premise of not sacrificing the performance of the smoke suction of the smoke machine, the noise generated when the smoke machine operates is relatively low and does not cause negative physiological and psychological effects of users. Finally, the invention designs and optimizes the specific installation position of the three-dimensional space sound field noise reduction device 2 in the smoke machine, and obtains the most effective noise reduction effect and the effective noise reduction space range.
Example 2.
The range hood with the oil smoke separating device 12 and the noise reducing device is the same as the embodiment 1 except that: the outer surface of the low damping bellows 11 of this embodiment is fitted with foam boards.
The outer surface of the low damping bellows 11 of the present invention may be provided with a foam board, or may be provided with any one of a foam board and a rubber board.
The foam board, foam board or rubber board functions to block noise from being transmitted to the outside, thereby reducing noise level.
Compared with the embodiment 1, the range hood of the embodiment has better noise reduction effect.
Example 3.
The range hood with the oil smoke separating device 12 and the noise reducing device is the same as the embodiment 1 except that: the oil smoke separating apparatus 12 of the present embodiment is located inside the full enclosure formed by the screen 115 of the air intake and the low damping bellows 11 and the three-dimensional spatial sound field noise reduction unit is located outside the full enclosure, as shown by a in fig. 11 and B in fig. 11.
Compared with embodiment 1, the seamless full-surrounding structure of the present embodiment can prevent noise sound waves from propagating to the outside, and the noise reduction effect can be improved better.
Example 4.
A range hood with a fume separation device 12 and a noise reduction device, wherein the noise reduction frequency range of a three-dimensional space sound field noise reduction device 2 is 100 Hz-2000 Hz.
The limitation that the active noise reduction in the prior art can only reduce the noise within 1000Hz is broken through, and the noise is effectively reduced to the noise frequency domain of 2000Hz at maximum.
Example 5.
A range hood with a fume separator 12 and a noise reducer, the noise reducing method, as shown in fig. 12-13, comprises the following steps:
step one, determining and fixing the positions of the A noise collecting sensors 221, the Q error feedback sensors 232 and the K speakers 222;
step two, determining the transfer function T1 of the initial noise source to the noise collection sensor 221 and the transfer function T of the loudspeaker 222 to the target noise reduction space 2 And a transfer function T3 of the noise collection sensor 221 to the target noise reduction space;
step three, the signals of the noise collecting sensors 221 of the collecting area of the A noise collecting sensors 221 in the space in the smoke machine are respectively, specifically R 1 (n)，......，R i (n),......,R A (n), i is a positive integer and is more than or equal to 4 and less than or equal to A, and Q error return noise sensors collect signals of the error return sensors 232 in the area respectively, specifically epsilon 1 (n)，......,ε v (n),......,ε Q (n), v is more than or equal to 1 and less than or equal to Q, v and Q are positive integers;
step four, converting the signals of the noise collecting sensors 221 collected by the a noise collecting sensors 221 obtained in the step one into R (n) = [ R 1 (n)......R i (n).......R A (n)]The signals of the error return sensor 232 after the correction of the Q noise collecting sensors 221 are converted into ε (n) = [ ε ] 1 (n)......ε v (n)......ε Q (n)]；
Fifthly, correcting R (n) in the fourth step into a compound with a formula (I)
Step six, D band pass filters 231 of the three-dimensional space noise reduction control unit are used for obtaining the three-dimensional space noise reduction control unitCorrespondingly decomposed into L subbands: r is (r) 1 (k)，......，r g (k)，......，r L (k) The correspondence of step four is decomposed into L subbands: e1 (k) and/or (g) are/is, e.g. g. L (k) is, e.g. eL (k) is, L is, e.g. 2 or more and L and g are positive integers;
seventh, the sub-band r obtained in the sixth step is obtained 1 (k)，......，r g (k)，......，r L(k) and e1 (k)，......，e g (k)，......，e L (k) Calculating self-adaptive weight coefficient w of L sub-bands through filtering X least mean square 1 (k)，......，w g (k)，......，w L (k) W (K) is a matrix of kxaxd, r (K) is q× (axkxd), e (K) is a matrix of q×d;
step eight, L sub-band adaptive weight coefficients w of the D band pass filters 231 1 (k)，......，w g (k)，......，w L (k) Performing a fast Fu Lilie conversion to l×z bands, where Z is a matrix of kxaxd;
step nine, superposing the L multiplied by Z frequency bands obtained in the step eight through a frequency superposition method to form a unique A multiplied by K matrix signal frequency;
tenth, performing Fourier inverse transformation to the frequency of the AxK matrix signal obtained in the ninth step to obtain a weight vector of the band-pass filter 231Quantity W ij (n) wherein 1.ltoreq.j.ltoreq.K, 4.ltoreq.i.ltoreq.A;
step eleven, converting the weight vector Wij (n) of the band-pass filter 231 obtained in step ten to generate K sound fields of the speakers 222, wherein the K sound fields of the speakers 222 are respectively corresponding to S 1 (n)，.....，S j (n)，.....,S K (n), wherein 1.ltoreq.j.ltoreq.K, and acquiring an initial noise source Ri (n) and a weight vector W of the band-pass filter 231 by the noise sensor according to the pass formula (II) ji The product of (n) to estimate the final noise field S of the j-th speaker 222 output signal j (n)，
wherein ,is W ij The transposed matrix of (n), R i (n) through T 2 Transposed matrix after transfer function, S j (n) is an equal intensity acoustic signal 180 ° inverted from the noise source;
step twelve, the equal-intensity sound wave signal S 1 (n)，.....，S j (n)，.....,S K (n) respectively corresponding to the K speakers 222;
thirteenth, the error feedback sensor 232 detects the effect, iterates and corrects the self-adaptive weight coefficient to obtain the final self-adaptive weight coefficient meeting the requirement and obtain S j ' (n), go to step fourteen;
step fourteen, S j ' n is the final equal intensity acoustic signal that is correspondingly transmitted to the corresponding speaker 222;
the full band cost function through equation (III) is expressed in terms of mean square error of the error sensor signal to supervise the performance of the three-dimensional noise reduction model,
where n is the iteration index through the adaptive algorithm;
wherein ε v (n)＝A(n)+S j (n)·T 2 Where a (n) is the final noise field created after the transmission of the initial noise source in the internal volume of the cigarette machine.
Wherein the step thirteen concrete steps comprise,
step 13.1, presetting a noise value Γ (n) =c of the error-feedback noise sensor, wherein C is the noise value of the region where the error-feedback noise sensor measures, and determining Γ (n) and [ A (n) -S j (n)T 2 ] 2 When [ A (n) -S j (n)T 2 ] 2 When > C, go to step 13.2 when [ A (n) -S j (n)T 2 ] 2 When C is less than or equal to C, entering a step 13.4;
step 13.2, w 1 (k)，......，w g (k)，......，w L (k) Respectively substituting Into (IV) to obtain new w 1 (k+1)，......，w g (k+1)，......，w L L adaptive weight coefficients of (k+1), μ being the convergence factor, enter step 13.3,
w (k+1) =w (k) + [ μr (k) e (k) ] formula (IV);
step 13.3, let w 1 (k+1)＝w1(k)，......，w g (k+1)＝w g (k)，......，w L (k+1)＝w L (k) Respectively as the weight vectors of the filters, and entering a step eight;
step 13.4, let S j (n)＝S j ' n, proceed to step fourteen.
The value of C of the present invention ranges from-0.001 dB to 0.001dB.
The adaptive noise reduction control unit 23 of the present invention continuously iterates, and adjusts the weight of the adaptive filtering to make the whole system converge to a stable state. For example: the noise acquisition sensor 221 acquires a noise signal at a noise source in the area, the signal is transmitted to the adaptive noise reduction control unit 23 to reduce noise, and then the calculation output signal is performed to drive the speaker 222 so as to eliminate the noise in the area where the speaker 222 is located. The error feedback sensor 232 monitors the sound pressure value of the region where the speaker 222 is located, so that the adaptive noise reduction control unit 23 adjusts the weight of the adaptive filtering to automatically change the amplitude of the speaker 222.
The self-adaptive algorithm adopts a filter X least mean square algorithm, has the advantages that an inverse matrix is not required to be solved, and optimal convergence solution can be realized without other predicted parameters, and compared with the standard least mean square algorithm, the self-adaptive noise reduction control unit 23 has the main characteristics that the self-adaptive algorithm adopts a signal processing method which is decomposed into a plurality of sub-bands and combines the filter X least mean square algorithm, so that the problem of needing a large amount of calculation can be effectively solved, and the noise reduction effect in a three-dimensional space is enhanced. Meanwhile, the calculated amount is inversely proportional to the number of the sub-bands, so that the stability of the whole system is improved, and the convergence is faster. Furthermore, the influence of each transmission channel on the algorithm is enhanced. Another advantage of this algorithm is that it removes the delay of the signal and enhances the overall noise reduction by adding an adaptive weighting algorithm to each subband by filtering the xleast mean square and then adjusting the final weighting coefficients via the band pass filter 231.
In a closed three-dimensional space, such as a space of length, width, and height L, W, H, respectively, the N-order acoustic mode functions thereof can be expressed as
wherein ,N1 、N 2 N 3 Is the acoustic mode number along rectangular coordinates X, Y, Z. In practical applications, such as a three-dimensional spatial noise reduction system for a smoke machine air duct, the noise frequency domain distribution of the smoke machine is broadband noise from 200Hz to 2000Hz and line spectrum noise generated by a plurality of fans and noise caused by vibration.
In the prior art, only the active noise reduction technology for eliminating the low-order acoustic modes such as typically less than 500Hz or less than 1000Hz is focused, but the noise frequency of the existing smoke machine comprises more than 1000Hz, and the noise power of the smoke machine to be effectively reduced in the prior art cannot meet the noise reduction strategy on the existing smoke machine. For a three-dimensional space sound field which is fully or partially enclosed like a smoke machine air duct or a space where the oil smoke separating device 12 is located, and the amplitude of a noise source mode and the mode coefficient of sound production of the loudspeaker 222 are core technologies for carrying out three-dimensional space noise reduction, the two unknowns are closely related to the peripheral structure of the space, the geometric shape and the sound source characteristics of the noise. Therefore, the noise hologram information is quickly and effectively established by an equivalent source method, namely the noise source amplitude and phase are recorded by the interference principle of the sound wave. Based on the effective and accurate estimation of the spatial noise and the free space noise radiation, the acoustic field signal can be rapidly and accurately simulated for eliminating the calculation of the noise in the smoke machine. The method can be used for adaptively solving the high-order acoustic mode, can improve the noise reduction frequency domain to 2000Hz, solves the problem that some frequency bands cannot be achieved in the existing active noise reduction technology, and breaks through the limitation that the active noise reduction can only reduce the noise within 1000 Hz.
The range hood noise reduction method with the oil smoke separation device 12 and the noise reduction device has the advantages that after signals are decomposed into sub-band signals, the sub-band signals are used for accelerating the convergence on an algorithm, and because the frequency spectrum dynamic domain of the sub-band signals is greatly reduced relative to the original signals, and meanwhile, the reduction rate of the calculated amount is in direct proportion to the number of the sub-bands, the signals are decomposed and then are used in a filtering X least mean square algorithm, and compared with the traditional active noise reduction method for directly processing the original signals, the method can improve the practical effect of the application of active noise reduction in a three-dimensional space.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the scope of the present application, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present application.

Claims (7)

1. The utility model provides a take lampblack absorber of oil smoke separator and noise reduction device which characterized in that: the smoke ventilator is provided with a smoke ventilator main body, a three-dimensional space sound field noise reduction device for actively reducing noise and a smoke separation device for absorbing and separating smoke particles, wherein the three-dimensional space sound field noise reduction device is assembled in the smoke ventilator main body, and the smoke separation device is assembled in the smoke ventilator main body in a transmission way;
The smoke ventilator main body is provided with a smoke ventilator main board for controlling the operation of the smoke ventilator, and the smoke ventilator main board is electrically connected with the three-dimensional space sound field noise reduction device;
the method comprises the steps that a main board of the smoke machine detects the working state of a main body of the smoke machine, when the working state is higher than a threshold value, the main board of the smoke machine transmits an indication signal to a three-dimensional space sound field noise reduction device, and the three-dimensional space sound field noise reduction device receives the indication signal and starts noise reduction work;
the three-dimensional space sound field noise reduction device is provided with a three-dimensional space sound field noise reduction unit and an adaptive noise reduction control unit, the adaptive noise reduction control unit is electrically connected with the three-dimensional space sound field noise reduction unit, and the three-dimensional space sound field noise reduction unit and the adaptive noise reduction control unit are respectively assembled on the smoke machine main body;
the three-dimensional space sound field noise reduction unit is provided with a fixing frame, a noise acquisition sensor, a loudspeaker and an acoustic resonance box, wherein the fixing frame is assembled in the smoke machine main body, the loudspeaker is arranged in the acoustic resonance box, the acoustic resonance box is fixedly assembled in the fixing frame and positioned below the oil smoke separation device, the noise acquisition sensor is fixedly arranged on the surface of the fixing frame, and the noise acquisition sensor and the loudspeaker are respectively electrically connected with the self-adaptive noise reduction control unit;
the self-adaptive noise reduction control unit is provided with a band-pass filter, the band-pass filter is assembled in the smoke machine main body, and the noise acquisition sensor and the loudspeaker are respectively and electrically connected with the band-pass filter;
The band-pass filter receives an indication signal of a main board of the smoke machine and starts noise reduction;
the smoke machine main body is provided with a low-damping air box for reducing broadband vibration, the low-damping air box is assembled in the smoke machine main body, and the oil smoke separation device is assembled in the low-damping air box in a transmission way;
the low damping bellows is provided with a plurality of bellows plates and a noise filtering device, the bellows plates are spliced into a three-dimensional structure, the noise filtering device is assembled on the inner surface of the bellows plates, and the fixing frame is assembled below the low damping bellows;
the oil smoke separation device is positioned in a full-surrounding structure formed by a filter screen of the air inlet and a low-damping bellows, and the three-dimensional space sound field noise reduction unit is positioned outside the full-surrounding structure; or alternatively
The oil fume separation device is positioned in a semi-enclosed structure which is formed by a low-damping bellows and has at least two completely opened structural surfaces;
decomposing the noise signal into a plurality of subband signals, converting to obtain a band-pass filter weight vector, converting the obtained band-pass filter weight vector to generate a corresponding loudspeaker sound field, transmitting an equal-intensity sound wave signal to a corresponding loudspeaker, and reducing or canceling noise sound waves generated by a range hood through sound waves generated by the corresponding loudspeaker to realize noise reduction;
The self-adaptive noise reduction control unit is also provided with an error return sensor which is fixedly arranged in the main body of the smoke machine and below the low-damping bellows, and the error return sensor is electrically connected with the band-pass filter;
the error return sensor is positioned below the loudspeaker;
the noise reduction method comprises the following steps:
step one, determining and fixing the positions of A noise acquisition sensors, Q error return sensors and K loudspeakers;
step two, determining a transfer function T1 from an initial noise source to a noise acquisition sensor, a transfer function T2 from a loudspeaker to a target noise reduction space and a transfer function T3 from the noise acquisition sensor to the target noise reduction space;
step three, A noise collecting sensors collect noise collecting sensor signals of the area in the space in the smoke machine respectively, specifically R 1 (n)，......，R i (n),......,R A (n), i is more than or equal to 4 and less than or equal to A, i is a positive integer,
q error return noise sensors collect signals of the error return noise sensors in the area, specifically epsilon 1 (n)，......,ε v (n),......,ε Q (n), v is more than or equal to 1 and less than or equal to Q, v and Q are positive integers;
step four, converting the noise acquisition sensor signals collected by the A noise acquisition sensors obtained in the step three into R (n) = [ R) 1 (n)......R i (n).......R A (n)]The signals of the error feedback sensors after the correction of the Q noise acquisition sensors are converted into epsilon (n) = [ epsilon ] 1 (n)......ε v (n)......ε Q (n)]；
Fifthly, R (n) in the fourth step is corrected to be in a formula (I)
Step six, D band-pass filters of the three-dimensional space noise reduction control unit are used for obtaining the three-dimensional space noise reduction control unitCorrespondingly decomposed into L subbands: r is (r) 1 (k)，......，r g (k)，......，r L (k) Decomposing the correspondence obtained in the fourth step into L sub-bands: e, e 1 (k)，......，e g (k)，......，e L (k) L is more than or equal to g is more than or equal to 2, and L and g are positive integers;
seventh, the sub-band r obtained in the sixth step is obtained 1 (k)，......，r g (k)，......，r L(k) and e1 (k)，......，e g (k)，......，e L (k) Calculating self-adaptive weight coefficient w of L sub-bands through filtering X least mean square 1 (k)，......，w g (k)，......，w L (k) W (K) is a matrix of kxaxd, r (K) is q× (axkxd), e (K) is a matrix of q×d;
step eight, L sub-band self-adaptive weight coefficients w of the D band-pass filters 1 (k)，......，w g (k)，......，w L (k) Performing a fast Fu Lilie conversion to l×z bands, where Z is a matrix of kxaxd;
step nine, superposing the L multiplied by Z frequency bands obtained in the step eight through a frequency superposition method to form a unique A multiplied by K matrix signal frequency;
step ten, performing Fourier inverse transformation on the frequency of the AxK matrix signal obtained in the step nine to obtain a band-pass filter weight vector W ij (n) wherein 1.ltoreq.j.ltoreq.K, 4.ltoreq.i.ltoreq.A;
step eleven, the step ten is carried out to obtain a weight vector W of the band-pass filter ij (n) converting to generate K speaker sound fields, the K speaker sound fields respectively corresponding to S 1 (n)，.....，S j (n)，.....,S K (n) wherein 1.ltoreq.j.ltoreq.K, and acquiring an initial noise source R by a noise sensor according to the formula (II) i (n) and bandpass filter weight vector W ji Product of (n) to estimate final noise field S of j-th speaker output signal j (n)，
wherein ,is W ij Transposed matrix of (n),>is R i (n) through T 2 The transposed matrix after the transfer function,
S j (n) is an equal intensity acoustic signal 180 ° inverted from the noise source;
step twelve, the equal-intensity sound wave signal S 1 (n)，.....，S j (n)，.....,S K (n) respectively and correspondingly transmitting the signals to K speakers;
thirteenth, the error returns the sensor detection effect, iterates and corrects the self-adaptive weight coefficient to obtain the final self-adaptive weight coefficient meeting the requirement and obtain S j ' (n), go to step fourteen;
step fourteen, S j 'n' is the final equal intensity acoustic signal correspondingly transmitted to the corresponding speakerAn acoustic device;
the performance of the three-dimensional noise reduction model is supervised by the representation of the cost function of the full band of (III) with the mean square error of the error sensor signal,
where n is the iteration index through the adaptive algorithm;
the said wherein εv (n)＝A(n)+S j (n)·T 2 Wherein A (n) is a final noise field formed by the initial noise source after being transmitted in the internal space of the smoke machine;
The step thirteen specifically comprises the steps of,
step 13.1, presetting a noise value Γ (n) =c of the error-feedback noise sensor, wherein C is the noise value of the region where the error-feedback noise sensor measures, and determining Γ (n) and [ A (n) -S j (n)T 2 ] 2 When [ A (n) -S j (n)T 2 ] 2 When > C, go to step 13.2 when [ A (n) -S j (n)T 2 ] 2 When C is less than or equal to C, entering a step 13.4;
step 13.2, w 1 (k)，......，w g (k)，......，w L (k) Respectively substituting Into (IV) to respectively obtain new w 1 (k+1)，......，w g (k+1)，......，w L L adaptive weight coefficients of (k+1), μ being the convergence factor, enter step 13.3,
w (k+1) =w (k) + [ μr (k) e (k) ] formula (iv);
step 13.3, let w 1 (k+1)＝w1(k)，......，w g (k+1)＝w g (k)，......，w L (k+1)＝w L (k) Respectively as the weight vectors of the filters, and entering a step eight;
step 13.4, let S j (n)＝S j ' (n), go to step fourteen;
the C value ranges from-0.001 dB to 0.001dB.
2. The range hood with a fume separator and a noise reducer according to claim 1, wherein: the smoke ventilator main board detects the rotating speed of the oil smoke separation device, and when the rotating speed of the oil smoke separation device is higher than a first threshold value, the smoke ventilator main board transmits an indication signal to the three-dimensional space sound field noise reduction device, and the three-dimensional space sound field noise reduction device receives the indication signal and starts noise reduction work.
3. The range hood with a fume separator and a noise reducer according to claim 2, wherein: the smoke machine main body is also provided with a rectifying plate, and the rectifying plate is assembled on the smoke machine main body;
The smoke ventilator main board detects the telescopic length of the rectifying plate, and when the telescopic length of the rectifying plate is higher than a second threshold value, the smoke ventilator main board transmits an indication signal to the three-dimensional space sound field noise reduction device, receives the indication signal and starts noise reduction work.
4. A range hood with a fume separator and a noise reducer according to claim 3, wherein: the first threshold value is 100-10000 rpm/min;
the second threshold value is 0-30 cm.
5. A range hood with a fume separator and a noise reducer according to claim 3, wherein: the first threshold value is 800-2000 rpm/min;
the second threshold value is 2-5 cm.
6. The range hood with a fume separator and a noise reducer according to claim 5, wherein: k speakers and acoustic resonance boxes are arranged, K is larger than or equal to 1, K is a positive integer, and the speakers and the acoustic resonance boxes are in one-to-one correspondence;
the cone or the diaphragm of the loudspeaker faces the air inlet of the cigarette machine main body and is parallel to the air inlet or forms an included angle beta which is less than or equal to 60 degrees;
the number of the noise acquisition sensors is A, A is more than or equal to 4, A is a positive integer, and A is more than or equal to K;
q error feedback sensors are arranged, Q is a positive integer, and Q is more than or equal to 1;
The noise collection sensor is positioned above the loudspeaker;
the number of the band-pass filters is D, and D is a positive integer;
the noise filtering device is a low damping noise filtering plate;
the low-damping noise filter plate is provided with a panel main body and a reinforcing structure, wherein a plurality of noise through holes are distributed in the panel main body, and the reinforcing structure is fixed on the panel main body;
the reinforcing structure is at least one of reinforcing ribs, rivets, guide edges, fixing frames, grooves or convex hulls;
the noise filtering device is provided with a sound absorbing part, and the sound absorbing part is assembled between the low damping noise filter plate and the wall surface of the low damping bellows;
the outer surface of the low damping bellows is provided with a foam board, an asphalt board or a rubber board;
the noise reduction frequency range of the three-dimensional space sound field noise reduction device is 100 Hz-2000 Hz.
7. A noise reduction method of a range hood with a lampblack separation device and a noise reduction device is characterized in that: by the noise reduction method of claim 1.
CN201810772839.5A 2018-03-08 2018-07-14 Lampblack absorber with lampblack separation device and noise reduction method Active CN108731073B (en)

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CN201810776758.2A Active CN108954442B (en) 2018-03-08 2018-07-14 Range hood with noise reduction device and noise reduction method
CN201810772859.2A Active CN108916948B (en) 2018-03-08 2018-07-14 Active noise reduction range hood and noise reduction method
CN201810772855.4A Active CN108916944B (en) 2018-03-08 2018-07-14 Range hood with noise reduction and visual detection functions and noise reduction method
CN201810772851.6A Active CN108916941B (en) 2018-03-08 2018-07-14 Range hood with detachable three-dimensional space sound field noise reduction device and noise reduction method
CN201810776710.1A Active CN108954440B (en) 2018-03-08 2018-07-14 Range hood with division-measuring-type three-dimensional space sound field noise reduction device and noise reduction method
CN201810772845.0A Active CN108916940B (en) 2018-03-08 2018-07-14 Intelligent range hood and noise reduction method
CN201810772856.9A Active CN108916945B (en) 2018-03-08 2018-07-14 Range hood with lower three-dimensional space sound field noise reduction device and noise reduction method
CN201810772854.XA Active CN108916943B (en) 2018-03-08 2018-07-14 Range hood with gesture control visual detection function and noise reduction method
CN201810772862.4A Active CN108916950B (en) 2018-03-08 2018-07-14 Low-damping fully-enclosed three-dimensional space sound field noise reduction range hood and noise reduction method
CN201810781599.5A Active CN108954444B (en) 2018-03-08 2018-07-14 Range hood capable of reducing noise through Hilbert-Huang transform and noise reduction method
CN201810772853.5A Active CN109340842B (en) 2018-03-08 2018-07-14 Oblique range hood with iterative upgrade function and noise reduction method
CN201810772857.3A Active CN108916946B (en) 2018-03-08 2018-07-14 Range hood with noise reduction device and air draft assembly linked and noise reduction method
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CN201810772839.5A Active CN108731073B (en) 2018-03-08 2018-07-14 Lampblack absorber with lampblack separation device and noise reduction method
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CN201810772851.6A Active CN108916941B (en) 2018-03-08 2018-07-14 Range hood with detachable three-dimensional space sound field noise reduction device and noise reduction method
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