CN109340842B - Oblique range hood with iterative upgrade function and noise reduction method - Google Patents

Oblique range hood with iterative upgrade function and noise reduction method Download PDF

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CN109340842B
CN109340842B CN201810772853.5A CN201810772853A CN109340842B CN 109340842 B CN109340842 B CN 109340842B CN 201810772853 A CN201810772853 A CN 201810772853A CN 109340842 B CN109340842 B CN 109340842B
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noise
noise reduction
range hood
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band
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CN109340842A (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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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

An inclined range hood with an iteration upgrading function and a noise reduction method are provided with a range hood main body, a signal receiving and transmitting device used for carrying out system upgrading iteration with external remote equipment and a three-dimensional space sound field noise reduction device used for actively reducing noise, wherein the signal receiving and transmitting device and the three-dimensional space sound field noise reduction device are respectively assembled in the range hood main body. The range hood of the invention decomposes noise signals into a plurality of sub-band signals, converts the sub-band signals to obtain the weight vector of the band-pass filter, converts the weight vector of the band-pass filter to generate a corresponding loudspeaker sound field, transmits equal-intensity sound wave signals to the corresponding loudspeaker, and cancels or cancels the noise sound wave generated by the range hood through the sound wave generated by the corresponding loudspeaker to realize noise reduction. The range hood solves the technical difficulty that noise and performance are mutually contradictory, and the noise generated by the range hood during operation is relatively low without causing negative influences on physiology and psychology of a user on the premise of not sacrificing the performance of absorbing oil smoke of the range hood.

Description

Oblique range hood with iterative upgrade function and noise reduction method
Technical Field
The invention relates to the field of range hoods, in particular to an inclined range hood with an iterative upgrade function and a noise reduction method.
Background
The existing active noise reduction technology, for example, the application in the earphone is a point-to-point noise reduction technology, that is, directional noise reduction, which cannot effectively eliminate noise with a large range. These techniques focus on eliminating one dimension of the plane acoustic wave in a small enclosed duct or space, which is very effective at low frequency ranges (less than 500 Hz). In order to realize low noise, the existing range hood generally directly sets low air volume, namely the low noise is realized by sacrificing the performance of oil smoke absorption of the range hood, but the oil smoke absorption effect is greatly reduced; in addition, some active noise reduction devices are arranged, but the active noise reduction can only reduce the noise within 1000Hz, and the active noise reduction devices cannot be adapted to high-order acoustic modes. However, in three-dimensional space, higher-order acoustic modes cannot be ignored, and noise reduction is very difficult and complicated especially in a closed large-space pipeline. Under the general condition, a plurality of standing waves and sound waves in different directions are mutually interfered and superposed, so that the noise reduction difficulty of the three-dimensional space is greatly increased.
Therefore, aiming at the defects of the prior art, the oblique range hood with the iterative upgrade function and the noise reduction method are provided to solve the defects of the prior art.
Disclosure of Invention
One of the purposes of the invention is to provide an inclined range hood with an iterative upgrade function to avoid the defects of the prior art. The oblique range hood with the iterative upgrading function achieves the optimization of the performance of the range hood through the three-dimensional space sound field noise reduction device, but simultaneously completes the work under the operation of low noise, and solves the technical difficulty that the noise and the performance are mutually contradictory.
The above object of the present invention is achieved by the following technical means.
The oblique range hood with the iteration upgrading function is provided with a range hood main body, a signal receiving and transmitting device used for carrying out system upgrading iteration with external remote equipment and a three-dimensional space sound field noise reduction device used for actively reducing noise, wherein the signal receiving and transmitting device and the three-dimensional space sound field noise reduction device are respectively assembled inside the range hood main body.
The signal receiving and transmitting device and the three-dimensional space sound field noise reduction device are respectively and electrically connected with a cigarette machine main board of the cigarette machine main body.
The signal receiving and transmitting device is in wireless signal connection with external remote equipment.
The signal transceiver sends a system upgrading signal to the external remote equipment, the external remote equipment receives the system upgrading signal and carries out system upgrading iterative operation to obtain an updating signal, the external remote equipment feeds the updating signal back to the signal transceiver, and the signal transceiver transmits the updating signal to the cigarette machine main board.
Preferably, the wireless signal between the signal transceiver and the external remote device is a WIFI signal, a 4G data network signal, a 5G data network signal, or a bluetooth signal.
Preferably, the external remote device is a smart sound box, a refrigerator, a mobile phone or a tablet computer.
The inclined range hood is also provided with a visual detection system for monitoring the smoke condition, the visual detection system is assembled on the main body of the range hood, and the visual detection system is electrically connected with a main board of the range hood.
Preferably, the three-dimensional space sound field noise reduction device is provided with a three-dimensional space sound field noise reduction unit and a self-adaptive noise reduction control unit, the self-adaptive noise reduction control unit is electrically connected with the three-dimensional space sound field noise reduction unit, the three-dimensional space sound field noise reduction unit is electrically connected with a main board of the cigarette machine, and the three-dimensional space sound field noise reduction unit and the self-adaptive noise reduction control unit are respectively assembled on the cigarette machine main body.
Preferably, the three-dimensional space sound field noise reduction unit is provided with a noise collection sensor, a loudspeaker and an acoustic resonator, the loudspeaker is installed inside the acoustic resonator, the acoustic resonator is fixedly assembled below an air draft assembly of the cigarette machine main body, the noise collection sensor is fixedly installed on the air draft assembly, and the noise collection sensor and the loudspeaker are respectively electrically connected with the self-adaptive noise reduction control unit.
Preferably, the self-adaptive noise reduction control unit is arranged as a band-pass filter, the band-pass filter is assembled inside the cigarette machine main body, the noise collection sensor and the loudspeaker are respectively electrically connected with the band-pass filter, and the band-pass filter is electrically connected with a cigarette machine main board and connected with WIFI or a serial port.
Preferably, the vision detection system is provided with an infrared light supplementing device, a camera device, a relay, a main control chip and an anti-fuzzy lens, wherein the infrared light supplementing device, the camera device and the relay are respectively electrically connected with the main control chip, the main control chip is electrically connected with a main board of the cigarette machine, the infrared light supplementing device and the camera device are respectively assembled on an external furnace facing the cigarette machine main body, and the anti-fuzzy lens is assembled on the outer surface of the camera device.
The camera device obtains the regional smog image information of outside stove of current cigarette machine main part and transmits to main control chip, and main control chip confirms the target area of current image and confirms current smog concentration level through detection algorithm and obtains the processing signal, and main control chip is with processing signal transmission to cigarette machine mainboard again, and the cigarette machine mainboard adjusts the rotational speed of convulsions subassembly or assembles the flexible length in the cowling panel of cigarette machine main part.
The cigarette machine mainboard feeds back the processing signal to the band-pass filter, and the band-pass filter receives the processing signal of the cigarette machine mainboard and adjusts the noise reduction strategy.
Preferably, the cigarette machine main body is provided with a low-damping air box for reducing broadband vibration, and the low-damping air box is assembled inside the cigarette machine main body.
Preferably, the low damping bellows is provided with a plurality of bellows plates which are joined to form a three-dimensional structure, and a noise filter which is mounted on an inner surface of the bellows plates.
Preferably, the air draft assembly is positioned inside a full surrounding structure formed by a filter screen of the air inlet and the low-damping air box; or
The air draft assembly is positioned inside a semi-enclosed structure which is composed of low-damping air boxes and at least has two completely opened structural surfaces.
Preferably, the air draft assembly is provided with a wind wheel, a volute and air guide hoods for guiding airflow to enter two sides of the wind wheel, the air guide hoods and the wind wheel are fixedly installed on the volute, the wind wheel is assembled inside the volute, the volute is fixedly assembled inside the low-damping wind box, and the wind wheel is electrically connected with the main board of the range hood.
The inclined range hood decomposes the noise signal into a plurality of sub-band signals, converts the sub-band signals to obtain the weight vector of the band-pass filter, converts the weight vector of the band-pass filter to generate a corresponding loudspeaker sound field, transmits the equal-intensity sound wave signal to the corresponding loudspeaker, and cancels or cancels the noise sound wave generated by the range hood through the sound wave generated by the corresponding loudspeaker to realize noise reduction.
Preferably, the self-adaptive noise reduction control unit is further provided with an error return sensor, the error return sensor is fixedly installed inside the cigarette machine main body and located below the low-damping air box, and the error return sensor is electrically connected with the band-pass filter.
Preferably, the error feedback sensor is located below the speaker.
Preferably, the number of the loudspeakers and the number of the acoustic resonance boxes are K, K is larger than or equal to 1, K is a positive integer, and the loudspeakers and the acoustic resonance boxes correspond to one another.
Preferably, the acoustic resonance box is fixedly mounted on the air guide sleeve and is suspended at the bottom of the low-damping air box.
Preferably, the cone or the diaphragm of the loudspeaker faces the air inlet of the main body of the cigarette making machine, and is parallel to the air inlet or forms an included angle beta with the air inlet, and the beta is less than or equal to 60 degrees.
Preferably, the noise collection sensors are fixed on the air guide sleeve, and A noise collection sensors are arranged, wherein A is more than or equal to 4, A is a positive integer, and A is more than or equal to K.
Preferably, the error feedback sensor is provided with 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 plurality of panel main bodies and reinforcing structures, wherein the panel main bodies are used for eliminating noise through holes, and the reinforcing structures are fixed on the panel main bodies.
Preferably, the reinforcing structure is at least one of a reinforcing rib, a rivet, a guide edge, a fixing frame, a groove or a convex hull.
Preferably, the noise filter device is provided with a sound absorbing portion which 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 fitted with a foam board, an asphalt board or a rubber board.
Preferably, the noise reduction frequency range of the three-dimensional space sound field noise reduction device is 100Hz to 2000 Hz.
The invention relates to a noise reduction method of an inclined range hood, which comprises the following steps:
determining and fixing the positions of A noise acquisition sensors, Q error feedback sensors and K loudspeakers;
step two, determining a transfer function T from an initial noise source to a noise acquisition sensor1Transfer function T of loudspeaker to target noise reduction space2And transfer function T of noise collection sensor to target noise reduction space3；
Step three, respectively collecting the noise collection sensor signals of the regions in which the A noise collection sensors are positioned in the space of the smoke machine, specifically R1(n)，......，Ri(n),......,RA(n), i is more than or equal to 4 and less than or equal to A, i is a positive integer,
q error feedback sensors collect the signals of the error feedback sensors respectively in the areas, specifically1(n)，......,v(n),......,Q(n), v is more than or equal to 1 and less than or equal to Q, and v and Q are positive integers;
step four, converting the noise acquisition sensor signals collected by the noise acquisition sensors A obtained in the step one into R (n) ═ R1(n)......Ri(n).......RA(n)]After Q noise collection sensors are corrected, the signal of error feedback sensor is converted into (n) ([ deg. ])1(n)......v(n)......Q(n)]；
Step five, correcting R (n) in the step four into R (n) through the formula (I)
Figure GDA0002512025300000063
Figure GDA0002512025300000061
Step six, the D band-pass filters of the three-dimensional space noise reduction control unit enable the D band-pass filters obtained in the step five
Figure GDA0002512025300000062
The corresponding decomposition into L subbands: r is1(k)，......，rg(k)，......，rL(k) Correspondingly decomposing (n) obtained in the fourth step into L sub-bands: e.g. of the type1(k)，......，eg(k)，......，eL(k) L is more than or equal to g and more than or equal to 2, and L and g are positive integers;
step seven, the sub-band r obtained in the step six is used1(k)，......，rg(k)，......，rL(k) And e1(k)，......，eg(k)，......，eL(k) Calculating the adaptive weight coefficient w of L sub-bands by filtering X least mean square1(k)，......，wg(k)，......，wL(k) W (K) is a matrix of K × A × D, r (K) is Q × (A × K × D), e (K) is a matrix of Q × D;
step eight, the L sub-bands of the D band-pass filters are subjected to self-adaptive weight coefficients w1(k)，......，wg(k)，......，wL(k) Performing fast Fourier transform to transform into L × Z frequency bands, wherein Z is a matrix of K × A × D;
step nine, superposing the L multiplied by Z frequency bands obtained in the step eight by a frequency superposition method to form a unique A multiplied by K matrix signal frequency;
step ten, carrying out Fourier inverse transformation solving on the signal frequency of the A × K matrix obtained in the step nine to obtain a weight vector W of the band-pass filterij(n), 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, obtaining the weight vector W of the band-pass filter in the step elevenij(n) converting to generate K loudspeaker sound fields, wherein the K loudspeaker sound fields respectively correspond to S1(n)，.....，Sj(n)，.....,SK(n), wherein j is more than or equal to 1 and less than or equal to K, and acquiring an initial noise source R through a noise sensor according to a formula (II)i(n) and the bandpass filter weight vector Wji(n) to estimate the final noise field S of the j-th loudspeaker output signalj(n)，
Figure GDA0002512025300000071
Wherein,
Figure GDA0002512025300000072
is Wij(n) a transpose of the matrix,
Figure GDA0002512025300000073
is Ri(n) by T2Transposed matrix after transfer function, Sj(n) is an equal intensity acoustic signal 180 ° opposite to the noise source;
step twelve, the equal intensity sound wave signal S1(n)，.....，Sj(n)，.....,SK(n) transmitting to the K loudspeakers respectively;
step thirteen, the error is transmitted back to the sensor detection effect, iteration is carried out and the self-adaptive weight coefficient is corrected, the final self-adaptive weight coefficient meeting the requirements is obtained, and S is obtainedj' (n), go to step fourteen;
step fourteen, with Sj' (n) the final equal intensity sound wave signal is correspondingly transmitted to the corresponding loudspeaker.
The representation of the three-dimensional noise reduction model is supervised by expressing the mean square error of the error feedback sensor signal through the cost function of the full band of the formula (III),
Figure GDA0002512025300000081
where n is the iteration index through the adaptive algorithm.
The above-mentioned
Figure GDA0002512025300000082
Wherein (n) ═ a (n) + Sj(n)·T2Where A (n) is the final noise field created by the initial noise source after transmission through the interior space of the machine.
Preferably, the step thirteen concretely comprises the steps of,
step 13.1, noise of the error feedback sensor is presetThe value (n) is C, where C is the noise value of the region where the error feedback sensor detected, and (n) and [ A (n) -S are determinedj(n)T2]2When [ A (n) -S ] isj(n)T2]2When the value is more than C, the step 13.2 is entered, when the value is [ A (n) -S [)j(n)T2]2When the temperature is less than or equal to C, entering the step 13.4;
step 13.2, mixing w1(k)，......，wg(k)，......，wL(k) Respectively substituting formula (IV) to respectively obtain new w1(k+1)，......，wg(k+1)，......，wLL adaptive weight coefficients of (k +1), μ being a convergence factor, are entered in step 13.3,
w (k +1) ═ w (k) + [ μ r (k) e (k) ] formula (IV);
step 13.3, let w1(k+1)＝w1(k)，......，wg(k+1)＝wg(k)，......，wL(k+1)＝wL(k) Respectively taking the weight vectors of the filter, and entering the step eight;
step 13.4, let Sj(n)＝Sj' (n), proceed to step fourteen.
Preferably, the above-mentioned C value ranges from 0dB to 0.001 dB.
The invention also aims to provide a noise reduction method of the inclined range hood with the iterative upgrade function, which is carried out by the noise reduction method.
The invention relates to an inclined range hood with an iteration upgrading function, which is provided with a range hood main body, a signal transceiving device for carrying out system upgrading iteration with external remote equipment and a three-dimensional space sound field noise reduction device for actively reducing noise, wherein the signal transceiving device and the three-dimensional space sound field noise reduction device are respectively assembled in the range hood main body. The signal receiving and transmitting device and the three-dimensional space sound field noise reduction device are respectively and electrically connected with a cigarette machine main board of the cigarette machine main body. The signal receiving and transmitting device is in wireless signal connection with external remote equipment. The range hood of the invention decomposes noise signals into a plurality of sub-band signals, converts the sub-band signals to obtain the weight vector of the band-pass filter, converts the weight vector of the band-pass filter to generate a corresponding loudspeaker sound field, transmits equal-intensity sound wave signals to the corresponding loudspeaker, and cancels or cancels the noise sound wave generated by the range hood through the sound wave generated by the corresponding loudspeaker to realize noise reduction. The range hood is provided with a range 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 range hood main body. The low-damping bellows can enable incident waves and reflected waves to have different phases at a specific distance from the reflecting surface, so that sound waves of noise can be mutually offset, and the intensity of the noise is reduced. The fully-enclosed structure or the semi-enclosed structure can optimize the performance of the range hood, but simultaneously complete the work under the operation of low noise, solve the technical difficulty of mutual contradiction between noise and performance, and have relatively low noise generated when the range hood operates without sacrificing the performance of oil smoke absorption of the range hood, and avoid negative influences on physiology and psychology of users. Meanwhile, the invention designs and optimizes the specific installation position of the three-dimensional space sound field noise reduction device in the range hood, and obtains the most effective noise reduction effect and the space range of effective noise reduction. Moreover, the method for reducing the noise of the inclined range hood with the iterative upgrade function is mainly characterized in that a signal processing method of a plurality of sub-bands is adopted and a filter least mean square (F-XLMS) algorithm is combined, so that a large amount of calculation can be effectively reduced, and the noise reduction effect of a three-dimensional space is improved. Meanwhile, the calculated amount is inversely proportional to the number of sub-bands, so that the stability of the system can be enhanced, and the convergence can be fast. Another advantage of this method is that it can remove signal delay and improve the overall noise reduction effect.
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The invention is further illustrated by means of the attached drawings, the content of which is not in any way limiting.
Fig. 1 shows the signal transmission relationship of an inclined range hood with iterative upgrade function according to the present invention.
FIG. 2 is a perspective view showing the structure of embodiment 1.
Fig. 3 is a side view of fig. 2.
Fig. 4 is a partial perspective view of fig. 2.
Fig. 5 is an exploded view of fig. 4.
FIG. 6 is a schematic perspective view of a low damping windbox.
Fig. 7 is a schematic structural diagram of a noise filtering device.
FIG. 8 is a top view of a low damping windbox.
Fig. 9 is a front view of a low damping bellows.
Fig. 10 is a schematic diagram of an included angle between the speaker and the air inlet.
FIG. 11 is a schematic view showing the structure of a low-damping bellows, wherein A in FIG. 11 is a full-enclosed structure, B in FIG. 11 is an alternate angle A in FIG. 11, C in FIG. 11 is a half-enclosed structure, and D in FIG. 11 is an alternate angle C in FIG. 11.
Fig. 12 is a schematic signal flow diagram illustrating a noise reduction signal processing method according to the present invention.
FIG. 13 is a schematic diagram of the bandpass filter processing of the noise acquisition sensor signal and the error return sensor.
In fig. 1 to 13, the following are included:
a main body 1 of the cigarette machine,
Low damping bellows 11, noise filter 111, sound absorbing part 112, reinforcing structure 113, through hole 114, screen 115,
The air draft assembly 12, the wind wheel 121, the volute 122, the air guide sleeve 123, the fairing 13,
A three-dimensional space sound field noise reduction device 2,
The three-dimensional space sound field noise reduction unit 22, the noise acquisition sensor 221, the loudspeaker 222, the acoustic resonator 223,
An adaptive noise reduction control unit 23, a band-pass filter 231, an error feedback sensor 232,
A vision detection system 3,
An external furnace 4,
And a signal transceiver 5.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples.
Example 1.
An inclined range hood with an iterative upgrade function is provided with a range hood main body 1, a signal transceiver 5 for performing system upgrade iteration with external remote equipment and a three-dimensional space sound field noise reduction device 2 for actively reducing noise, wherein the signal transceiver 5 and the three-dimensional space sound field noise reduction device 2 are respectively assembled inside the range hood main body 1, as shown in fig. 1 to 10. The signal receiving and transmitting device 5 and the three-dimensional space sound field noise reduction device 2 are respectively and electrically connected with a cigarette machine main board of the cigarette machine main body 1.
The signal transceiver 5 is in wireless signal connection with an external remote device. The signal transceiver 5 sends a system upgrading signal to external remote equipment, the external remote equipment receives the system upgrading signal and carries out system upgrading iterative operation to obtain an updating signal, the external remote equipment feeds the updating signal back to the signal transceiver 5, and the signal transceiver 5 transmits the updating signal to the cigarette machine main board.
The wireless signal between the signal transceiver 5 and the external remote device of the present invention is preferably a WIFI signal, and may be any one of a 4G data network signal, a 5G data network signal, or a bluetooth signal, and the specific implementation manner is determined according to the actual situation.
The external remote equipment is preferably an intelligent sound box, and can also be a refrigerator, a mobile phone or a tablet personal computer, and the like, and the system with the inclined range hood can be upgraded and iterated with the inclined range hood system.
The invention has the advantage of reducing the hardware requirement of the inclined range hood when the system upgrading iteration is carried out with the external remote equipment.
The inclined range hood is also provided with a visual detection system 3 for monitoring the smoke condition, the visual detection system 3 is assembled on the range hood main body 1, and the visual detection system 3 is electrically connected with a range hood main board of the range hood main body 1.
The three-dimensional space sound field noise reduction device 2 is provided with a three-dimensional space sound field noise reduction unit 22 and a self-adaptive noise reduction control unit 23, the self-adaptive noise reduction control unit 23 is electrically connected with the three-dimensional space sound field noise reduction unit 22, the three-dimensional space sound field noise reduction unit 22 is electrically connected with a cigarette machine main board, and the three-dimensional space sound field noise reduction unit 22 and the self-adaptive noise reduction control unit 23 are respectively assembled on the cigarette machine main body 1.
The three-dimensional space sound field noise reduction unit 22 is provided with a noise collection sensor 221, a loudspeaker 222 and an acoustic resonator 223, the loudspeaker 222 is installed inside the acoustic resonator 223, the acoustic resonator 223 is fixedly assembled below the air draft assembly 12 of the cigarette machine main body 1, the noise collection sensor 221 is fixedly installed on the air draft assembly 12, 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 set as a band-pass filter 231, the band-pass filter 231 is assembled inside the cigarette maker main body 1, and the noise collection sensor 221 and the speaker 222 are electrically connected with the band-pass filter 231 respectively. The band-pass filter 231 and the cigarette machine main board are preferably electrically connected, and can also be connected in a WIFI (wireless fidelity) or serial port mode.
The vision detection system 3 is provided with an infrared light supplementing device, a camera device, a relay, a main control chip and an anti-fuzzy lens, wherein the infrared light supplementing device, the camera device and the relay are respectively electrically connected with the main control chip, the main control chip is electrically connected with a main board of the cigarette machine, the infrared light supplementing device and the camera device are respectively assembled on an external furnace facing the cigarette machine main body 1, and the anti-fuzzy lens is assembled on the outer surface of the camera device.
The camera device obtains the regional smog image information of outside stove 4 of current cigarette machine main part 1 and transmits to main control chip, and main control chip confirms the target area of current image and confirms current smog concentration level through detection algorithm and obtains the processing signal, and main control chip is with processing signal transmission to cigarette machine mainboard again, and the cigarette machine mainboard adjusts the rotational speed of convulsions subassembly 12 or assembles the flexible length in the cowling panel 13 of cigarette machine main part 1.
The cigarette machine mainboard feeds back the processing signal to the band-pass filter 231 and connects, and the band-pass filter 231 receives the processing signal of cigarette machine mainboard and adjusts the noise reduction strategy.
The infrared light supplementing device is used for improving the light intensity of the picture collected by the camera device, and the anti-fuzzy lens is used for preventing the concentration of water vapor or oil smoke from influencing the definition of the picture collected by the camera device.
The three-dimensional space sound field noise reduction device 2 is provided with a three-dimensional space sound field noise reduction unit 22 and a self-adaptive noise reduction control unit 23, the self-adaptive noise reduction control unit 23 is electrically connected with the three-dimensional space sound field noise reduction unit 22, the three-dimensional space sound field noise reduction unit 22 is electrically connected with a cigarette machine main board, and the three-dimensional space sound field noise reduction unit 22 and the self-adaptive noise reduction control unit 23 are respectively assembled on the cigarette machine main body 1.
The cigarette machine main body 1 is provided with a low-damping air box 11 for reducing broadband vibration, and the low-damping air box 11 is assembled inside the cigarette machine main body 1.
The low-damping bellows 11 is provided with a plurality of bellows plates and a noise filtering device 111, the bellows plates are spliced into a three-dimensional structure, and the noise filtering device 111 is assembled on the inner surface of the bellows plates.
The draft assembly 12 of this embodiment is located within a half enclosure having at least two structural faces fully open, as shown in fig. 6, C in fig. 11 and D in fig. 11, and comprising a low damping bellows 11.
The air draft assembly 12 is provided with a wind wheel 121, a volute 122 and air guide hoods 123 for guiding air flow to enter two sides of the wind wheel 121, the air guide hoods 123 and the wind wheel 121 are fixedly installed on the volute 122, the wind wheel 121 is assembled inside the volute 122, the volute 122 is fixedly assembled inside the low-damping wind box 11, and the wind wheel 121 is electrically connected with a main board of the range hood.
It should be noted that, the visual inspection system 3 and the three-dimensional spatial sound field noise reduction apparatus 2 may also be independently started, and the specific embodiment is determined according to the actual situation.
The range hood of the invention decomposes noise signals into a plurality of sub-band signals, converts the sub-band signals to obtain the weight vector of the band-pass filter 231, converts the weight vector of the band-pass filter 231 to generate a corresponding loudspeaker 222 sound field, transmits the equal-intensity sound wave signals to the corresponding loudspeaker 222, and cancels or cancels the noise sound wave generated by the range hood through the sound wave generated by the corresponding loudspeaker 222, thereby realizing 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 cigarette machine main body 1 and located below the low-damping air box 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 ° opposite to 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 22 is configured to decompose the signal of the noise collection sensor 221 or the signal of the error return sensor 232 into a plurality of sub-bands, receive the wave frequency of the noise source transmitted by the noise collection sensor 221 and the signal of the error return sensor 232, perform an operation, and output a signal to the speaker 222.
K loudspeakers 222 and K acoustic resonance boxes 223 are arranged, K is larger than or equal to 1 and is a positive integer, and the loudspeakers 222 and the acoustic resonance boxes 223 correspond to one another. The acoustic resonance box 223 is fixedly mounted to the pod 123 and suspended from the bottom of the low damping bellows 11. The cone or diaphragm of the speaker 222 faces the air inlet of the main body 1 of the cigarette making machine, and is parallel to the air inlet 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 specifically set to 2.
The noise collection sensors 221 of the present invention are provided with a, a is greater than or equal to 4, a is a positive integer, and a is greater than or equal to K, and the noise collection sensors 221 of the present embodiment are specifically provided with 4.
The error feedback sensors 232 of the present invention are provided with Q, Q is a positive integer, Q is greater than or equal to 1, and the number of the error feedback sensors 232 of the present embodiment is specifically set to 2.
The noise collection sensor 221 is located above the speaker 222, and the number of the band pass filters 231 is D, where D is a positive integer. The band pass filters 231 of the present embodiment are set to 4.
It should be noted that the number of the speakers 222 of the present invention may be set to 2, or may be set to be any positive integer; the number of the noise collection sensors 221 may be set to 4, or may be set to any positive integer greater than 4; the number of the error feedback sensors 232 can be set to be 2, or can be set to 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 manner is determined according to the actual situation.
The noise filtering device 111 is a low damping noise filtering plate, the low damping noise filtering plate is distributed with a plurality of panel main bodies for eliminating noise through holes 114 and a reinforcing structure 113, and the reinforcing structure 113 is fixed on the panel main 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, a groove, or a convex hull. The noise filter 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 air box 11. The reinforcing structure of the present embodiment is a reinforcing rib.
It should be noted that the reinforcing structure of the present invention may be a rivet, a guide edge, a fixing frame, a groove, or a convex hull, or may be any combination of a plurality of types, and the specific embodiment is determined in actual circumstances.
The reinforcing structure functions to enhance the rigidity of the low damping noise filter plate.
The principle of the invention is as follows: when the inclined range hood system needs, the signal transceiver 5 sends a system upgrading signal to the external remote equipment, the external remote equipment receives the system upgrading signal and performs system upgrading iterative operation to obtain an updating signal, the external remote equipment feeds the updating signal back to the signal transceiver 5, and the signal transceiver 5 transmits the updating signal to the main board of the range hood. When the cigarette machine main body 1 is started, the cigarette machine main board provides a power supply for the visual detection system 3 and the three-dimensional space sound field noise reduction device 2, the visual detection system 3 and the three-dimensional space sound field noise reduction device 2 are started simultaneously or within 0.5 to 5 seconds, and the three-dimensional space sound field noise reduction device 2 is used for reducing noise. Wherein the smog condition in the stove region is monitored to vision detection system 3, and vision detection system 3 and confirm current smog concentration level and will handle signal transmission to cigarette machine mainboard, and the cigarette machine mainboard is adjusted the rotational speed of convulsions subassembly 12 or is assembled in the flexible length of the cowling panel 13 of cigarette machine main part 1. The cigarette machine mainboard feeds back the gear number adjustment indicating signal or the processing signal to the three-dimensional space sound field noise reduction device 2, and the three-dimensional space sound field noise reduction device 2 adjusts the noise reduction strategy. For example, when the vision detecting system 3 detects that there is much smoke, the vision detecting system 3 transmits a signal to the main board of the range hood, the main board of the range hood increases the rotation speed of the exhaust assembly 1213, and increases the extension length of the rectifying plate 13 of the range hood body 1 so as to increase the area of the air inlet, thereby rapidly exhausting the smoke, and vice versa.
When noise generated by the range hood contacts the fully-enclosed structure or the semi-enclosed structure of the low-damping air box 11, most incident waves propagating in the opposite direction interfere with reflected waves. Meanwhile, the noise reduction is carried out by the resonance principle of the range hood, when the noise resonates with the natural frequency of the low-damping air box 11, when the resonance occurs, the oscillating sound waves violently penetrate into and out of 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 purpose of eliminating the target frequency noise is achieved.
The inclined range hood with the iteration upgrading function is provided with a range hood main body 1, a signal receiving and transmitting device 5 used for carrying out system upgrading iteration with external remote equipment and a three-dimensional space sound field noise reduction device 2 used for actively reducing noise, wherein the signal receiving and transmitting device 5 and the three-dimensional space sound field noise reduction device 2 are respectively assembled inside the range hood main body 1. The range hood of the invention decomposes noise signals into a plurality of sub-band signals, converts the sub-band signals to obtain the weight vector of the band-pass filter 231, converts the weight vector of the band-pass filter 231 to generate a corresponding loudspeaker 222 sound field, transmits the equal-intensity sound wave signals to the corresponding loudspeaker 222, and cancels or cancels the noise sound wave generated by the range hood through the sound wave generated by the corresponding loudspeaker 222, thereby realizing noise reduction. The low damping bellows 11 of this lampblack absorber can make incident wave and reflection wave have different phases under the specific distance with the plane of reflection to the sound wave of noise can offset each other, thereby the intensity of noise reduction. The fully-enclosed structure or the semi-enclosed structure can optimize the performance of the range hood, but simultaneously complete the work under the operation of low noise, solve the technical difficulty of mutual contradiction between noise and performance, and have relatively low noise generated when the range hood operates without sacrificing the performance of oil smoke absorption of the range hood, and avoid negative influences on physiology and psychology 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 range hood, and obtains the most effective noise reduction effect and the space range of effective noise reduction.
Example 2.
An inclined range hood with an iterative upgrade function has the same other characteristics as embodiment 1, and is different in that: the outer surface of the low damping bellows 11 of this embodiment is fitted with a foam board.
It should be noted that the outer surface of the low damping bellows 11 of the present invention may be equipped with a foam board, or may be equipped with any one of a foam board and a rubber board.
The foam board, the foam board or the rubber board functions to block the transmission of noise to the outside, thereby reducing the noise level.
Compared with embodiment 1, the noise reduction effect of the range hood of the embodiment is better.
Example 3.
An inclined range hood with an iterative upgrade function has the same other characteristics as embodiment 1, and is different in that: the visual inspection system 3 and the three-dimensional space sound field noise reduction device 2 of the present embodiment are independently started.
The working process is as follows: when the cigarette machine main body 1 is started, the cigarette machine main board provides power for the visual detection system 3 and the three-dimensional space sound field noise reduction device 2, and a user respectively selects to start the visual detection system 3 and the three-dimensional space sound field noise reduction device 2 according to actual conditions. And when the three-dimensional space sound field noise reduction device 2 is started, noise reduction is carried out. When the vision detection system 3 is started, the vision detection system 3 monitors the smoke condition of the stove area, the vision detection system 3 determines the current smoke concentration level and transmits a processing signal to the main board of the range hood, and the main board of the range hood adjusts the rotating speed of the air draft assembly 12 or the telescopic length of the rectifying plate 13 assembled on the main body 1 of the range hood. For example, when the vision detecting system 3 detects that there is much smoke, the vision detecting system 3 transmits a signal to the main board of the range hood, the main board of the range hood increases the rotation speed of the exhaust assembly 1213, and increases the extension length of the rectifying plate 13 of the range hood body 1 so as to increase the area of the air inlet, thereby rapidly exhausting the smoke, and vice versa.
Compared with embodiment 1, the present embodiment has improved flexibility in that the visual inspection system 3 and the three-dimensional spatial sound field noise reduction device 2 can be selectively turned on.
Example 4.
An inclined range hood with an iterative upgrade function has the same other characteristics as embodiment 2, and is different in that: the extraction assembly 12 of this embodiment is located inside the fully enclosed structure formed by the screen 115 of the air intake and the low damping bellows 11, as shown at a in fig. 11 and B in fig. 11.
Compared with embodiment 2, the seamless full-enclosure structure of the present embodiment can prevent the noise sound wave from propagating to the outside, and can improve the noise reduction effect better.
Example 5.
An inclined range hood with an iterative upgrade function is provided, wherein a 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 frequency domain of the maximum 2000Hz is effectively reduced.
Example 6.
An inclined range hood with an iterative upgrade function and a noise reduction method are shown in fig. 12-13, and comprise the following steps:
step one, determining and fixing the positions of A noise acquisition sensors 221, Q error return sensors 232 and K loudspeakers 222;
step two, determining the transfer function T from the initial noise source to the noise collection sensor 2211The transfer function T of the speaker 222 to the target noise reduction space2And the transfer function T of the noise collection sensor 221 to the target noise reduction space3；
Thirdly, the A noise acquisition sensors 221 respectively collect the signals of the noise acquisition sensors 221 in the regions in the space of the cigarette machine, specifically R1(n)，......，Ri(n),......,RA(n), i is more than or equal to 4 and less than or equal to A, i is a positive integer,
the Q error feedback sensors collect the signals of the error feedback sensors 232 in the respective areas, specifically1(n)，......,v(n),......,Q(n), v is more than or equal to 1 and less than or equal to Q, and v and Q are positive integers;
step four, converting the noise collection sensor 221 signals collected by the a noise collection sensors 221 obtained in step one into R (n) ═ R1(n)......Ri(n).......RA(n)]Q noise collection sensors 221 corrected error feedback sensor 232The signal of (a) is converted into (n) ═ 21(n)......v(n)......Q(n)]；
Step five, correcting R (n) in the step four into R (n) through the formula (I)
Figure GDA0002512025300000202
Figure GDA0002512025300000201
Step six, the D band-pass filter 231 of the three-dimensional space noise reduction control unit enables the D band-pass filter 231 obtained in the step five
Figure GDA0002512025300000211
The corresponding decomposition into L subbands: r is1(k)，......，rg(k)，......，rL(k) Correspondingly decomposing (n) obtained in the fourth step into L sub-bands: e.g. of the type1(k)，......，eg(k)，......，eL(k) L is more than or equal to g and more than or equal to 2, and L and g are positive integers;
step seven, the sub-band r obtained in the step six is used1(k)，......，rg(k)，......，rL(k) And e1(k)，......，eg(k)，......，eL(k) Calculating the adaptive weight coefficient w of L sub-bands by filtering X least mean square1(k)，......，wg(k)，......，wL(k) W (K) is a matrix of K × A × D, r (K) is Q × (A × K × D), e (K) is a matrix of Q × D;
step eight, adapting the L sub-band adaptive weight coefficients w of the D band-pass filters 2311(k)，......，wg(k)，......，wL(k) Performing fast Fourier transform to transform into L × Z frequency bands, wherein Z is a matrix of K × A × D;
step nine, superposing the L multiplied by Z frequency bands obtained in the step eight by a frequency superposition method to form a unique A multiplied by K matrix signal frequency;
step ten, performing Fourier inverse transformation solution on the signal frequency of the A × K matrix obtained in the step nine to obtain the weight vector W of the band-pass filter 231ij(n), 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, obtaining the weight vector W of the band-pass filter 231 in the step elevenij(n) converting to generate K speaker 222 sound fields, the K speaker 222 sound fields corresponding to S1(n)，.....，Sj(n)，.....,SK(n), wherein j is more than or equal to 1 and less than or equal to K, and acquiring an initial noise source R through a noise sensor according to a formula (II)i(n) and the weight vector W of the band pass filter 231ji(n) to estimate the final noise field S of the output signal of the jth speaker 222j(n)，
Figure GDA0002512025300000212
Wherein,
Figure GDA0002512025300000213
is Wij(n) a transpose of the matrix,
Figure GDA0002512025300000214
is Ri(n) by T2Transposed matrix after transfer function, Sj(n) is an equal intensity acoustic signal 180 ° opposite to the noise source;
step twelve, the equal intensity sound wave signal S1(n)，.....，Sj(n)，.....,SK(n) are respectively transmitted to the K speakers 222;
step thirteen, the error feedback sensor 232 detects the effect, iterates and corrects the adaptive weight coefficient to obtain the final adaptive weight coefficient meeting the requirements and Sj' (n), go to step fourteen;
step fourteen, with Sj' (n) the final equal intensity sound wave signal is correspondingly transmitted to the corresponding speaker 222;
the representation of the three-dimensional noise reduction model is supervised by expressing the mean square error of the error feedback sensor signal through the cost function of the full band of the formula (III),
Figure GDA0002512025300000221
wherein n is an iterative index through an adaptive algorithm;
Figure GDA0002512025300000222
wherein (n) ═ a (n) + Sj(n)·T2Where A (n) is the final noise field created by the initial noise source after transmission through the interior space of the machine.
Wherein the thirteen steps specifically comprise the following steps of,
step 13.1, presetting the noise value (n) ═ C of the error feedback sensor, where C is the noise value of the area where the error feedback sensor is located, and judging (n) and [ a (n) — Sj(n)T2]2When [ A (n) -S ] isj(n)T2]2When the value is more than C, the step 13.2 is entered, when the value is [ A (n) -S [)j(n)T2]2When the temperature is less than or equal to C, entering the step 13.4;
step 13.2, mixing w1(k)，......，wg(k)，......，wL(k) Respectively substituting formula (IV) to respectively obtain new w1(k+1)，......，wg(k+1)，......，wLL adaptive weight coefficients of (k +1), μ being a convergence factor, are entered in step 13.3,
w (k +1) ═ w (k) + [ μ r (k) e (k) ] formula (IV);
step 13.3, let w1(k+1)＝w1(k)，......，wg(k+1)＝wg(k)，......，wL(k+1)＝wL(k) Respectively taking the weight vectors of the filter, and entering the step eight;
step 13.4, let Sj(n)＝Sj' (n), proceed to step fourteen.
The value of C of the present invention ranges from-0.001 dB to 0.001 dB.
The adaptive noise reduction control unit 23 of the present invention continuously performs iteration to adjust the weight of adaptive filtering so that the convergence of the whole system tends to a stable state. For example: noise signals are collected at a noise source position in the area where the noise collection sensor 221 is located, the signals are transmitted to the adaptive noise reduction control unit 23 for noise reduction, and then calculation is performed to output signals to drive the loudspeaker 222 so as to eliminate the noise in the area where the loudspeaker 222 is located. The error feedback sensor 232 monitors the sound pressure value of the area where the speaker 222 is located, so that the adaptive noise reduction control unit 23 adjusts the adaptive filtering weight to automatically change the amplitude of the speaker 222.
The adaptive algorithm of the invention adopts a filtering X least mean square algorithm, the advantage of the filtering X least mean square method is that the optimal convergence solution can be realized without solving an inverse matrix and other pre-known parameters, and compared with the standard least mean square algorithm, the algorithm of the adaptive noise reduction control unit 23 is mainly characterized in that a signal processing method which is decomposed into a plurality of sub-bands is adopted and combined with the filtering X least mean square algorithm, 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 in inverse proportion to the number of the sub-bands, so that the stability of the whole system is improved, and the convergence is faster. Moreover, the influence of each transmission channel on the algorithm is strengthened. Another advantage of this algorithm is that it can remove the delay doubt of the signal and enhance the overall noise reduction effect by adding an adaptive weighting algorithm in each subband by filtering X least mean square method and then adjusting the final weighting coefficients via the band pass filter 231.
In a closed three-dimensional space, such as a space with a length, a width and a height of L, W, H, the N-th order acoustic mode function can be expressed as
Figure GDA0002512025300000241
Wherein N is1、N2And N3Is the acoustic mode number along the rectangular coordinate X, Y, Z. In practical applications, such as three-dimensional space noise reduction systems of air ducts of cigarette making machines, the noise frequency domain distribution of the cigarette making machines is broadband noise from 200Hz to 2000Hz, and line spectrum noise generated by some fans and noise caused by vibration.
In the prior art, only the active noise reduction technology for eliminating low-order sound modes such as the typical noise reduction technology of less than 500Hz or less than 1000Hz is focused, but the noise frequency of the existing cigarette making machine is more than 1000Hz, and the noise power of the existing cigarette making machine which needs to be effectively reduced cannot meet the noise reduction strategy of the existing cigarette making machine. For a three-dimensional sound field which is completely or partially surrounded by a space where an air duct or an air draft assembly 12 of a cigarette machine is located, and the amplitude of a noise source mode and the mode coefficient of a loudspeaker 222 sound production are used for three-dimensional noise reduction, the core technology for actively reducing the noise is the unknown number, and the two unknown numbers are closely related to the peripheral structure, 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 amplitude and the phase of the noise source are recorded by the interference principle of the sound wave. Based on the effective and accurate estimation of the space noise and the free space noise radiation, the sound field signal can be simulated quickly and accurately to eliminate the calculation of the noise in the smoke ventilator. The method can adapt to solving the high-order acoustic mode, can improve the frequency domain of noise reduction 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 oblique range hood noise reduction method with the iterative upgrade function has the advantages that after signals are decomposed into sub-band signals, the signals are used for accelerating convergence on an algorithm, the dynamic domain of the frequency spectrum of the sub-band signals is greatly reduced relative to original signals, and meanwhile, the reduction rate of calculated amount is in direct proportion to the number of the sub-bands, so that the signals are decomposed and then used in a filtering X least mean square algorithm.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (9)

1. The utility model provides an oblique range hood with iteration upgrading function which characterized in that: the smoke machine is provided with a smoke machine main body, a signal transceiver for carrying out system upgrading iteration with external remote equipment and a three-dimensional space sound field noise reduction device for actively reducing noise, wherein the signal transceiver and the three-dimensional space sound field noise reduction device are respectively assembled in the smoke machine main body;
the signal receiving and transmitting device and the three-dimensional space sound field noise reduction device are respectively and electrically connected with a cigarette machine main board of the cigarette machine main body;
the signal receiving and transmitting device is in wireless signal connection with external remote equipment;
the signal transceiver sends a system upgrading signal to the external remote equipment, the external remote equipment receives the system upgrading signal and performs system upgrading iterative operation to obtain an updating signal, the external remote equipment feeds the updating signal back to the signal transceiver, and the signal transceiver transmits the updating signal to the smoke machine mainboard;
decomposing the noise signal into a plurality of sub-band signals, converting to obtain a weight vector of a band-pass filter, converting the weight vector of the band-pass filter to generate a corresponding loudspeaker sound field, transmitting the equal-intensity sound wave signal to a corresponding loudspeaker, and offsetting or counteracting the noise sound wave generated by the range hood through the sound wave generated by the corresponding loudspeaker to realize noise reduction;
a method of noise reduction comprising the steps of:
determining and fixing the positions of A noise acquisition sensors, Q error feedback sensors and K loudspeakers;
step two, determining a transfer function T from an initial noise source to a noise acquisition sensor1Transfer function T of loudspeaker to target noise reduction space2And transfer function T of noise collection sensor to target noise reduction space3；
Step three, respectively collecting the noise collection sensor signals of the regions in which the A noise collection sensors are positioned in the space of the smoke machine, specifically R1(n)，......，Ri(n),......,RA(n), i is more than or equal to 4 and less than or equal to A, i is a positive integer,
q error feedback sensors collect the signals of the error feedback sensors respectively in the areas, specifically1(n)，......,v(n),......,Q(n), v is more than or equal to 1 and less than or equal to Q, and v and Q are positive integers;
step four, the A noise signals obtained in the step three are collectedConverting the noise collected by the sensor into R (n) ═ R1(n)......Ri(n).......RA(n)]After Q noise collection sensors are corrected, the signal of error feedback sensor is converted into (n) ([ deg. ])1(n)......v(n)......Q(n)]；
Step five, correcting R (n) in the step four into R (n) through the formula (I)
Figure FDA0002512025290000023
Figure FDA0002512025290000021
Step six, the D band-pass filters of the three-dimensional space noise reduction control unit enable the D band-pass filters obtained in the step five
Figure FDA0002512025290000022
The corresponding decomposition into L subbands: r is1(k)，......，rg(k)，......，rL(k) Correspondingly decomposing (n) obtained in the fourth step into L sub-bands: e.g. of the type1(k)，......，eg(k)，......，eL(k) L is more than or equal to g and more than or equal to 2, and L and g are positive integers;
step seven, the sub-band r obtained in the step six is used1(k)，......，rg(k)，......，rL(k) And e1(k)，......，eg(k)，......，eL(k) Calculating the adaptive weight coefficient w of L sub-bands by filtering X least mean square1(k)，......，wg(k)，......，wL(k) W (K) is a matrix of K × A × D, r (K) is Q × (A × K × D), e (K) is a matrix of Q × D;
step eight, the L sub-bands of the D band-pass filters are subjected to self-adaptive weight coefficients w1(k)，......，wg(k)，......，wL(k) Performing fast Fourier transform to transform into L × Z frequency bands, wherein Z is a matrix of K × A × D;
step nine, superposing the L multiplied by Z frequency bands obtained in the step eight by a frequency superposition method to form a unique A multiplied by K matrix signal frequency;
step ten, carrying out Fourier inverse transformation solving on the signal frequency of the A × K matrix obtained in the step nine to obtain a weight vector W of the band-pass filterij(n), 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, obtaining the weight vector W of the band-pass filter in the step elevenij(n) converting to generate K loudspeaker sound fields, wherein the K loudspeaker sound fields respectively correspond to S1(n)，.....，Sj(n)，.....,SK(n), wherein j is more than or equal to 1 and less than or equal to K, and acquiring an initial noise source R through a noise sensor according to a formula (II)i(n) and the bandpass filter weight vector Wji(n) to estimate the final noise field S of the j-th loudspeaker output signalj(n)，
Figure FDA0002512025290000031
Wherein,
Figure FDA0002512025290000032
is Wij(n) a transpose of the matrix,
Figure FDA0002512025290000033
is Ri(n) by T2Transposed matrix after transfer function, Sj(n) is an equal intensity acoustic signal 180 ° opposite to the noise source;
step twelve, the equal intensity sound wave signal S1(n)，.....，Sj(n)，.....,SK(n) transmitting to the K loudspeakers respectively;
step thirteen, the error is transmitted back to the sensor detection effect, iteration is carried out and the self-adaptive weight coefficient is corrected, the final self-adaptive weight coefficient meeting the requirements is obtained, and S is obtainedj' (n), go to step fourteen;
step fourteen, with Sj' (n) the final equal-intensity sound wave signals are correspondingly transmitted to corresponding loudspeakers;
the representation of the three-dimensional noise reduction model is supervised by expressing the mean square error of the error feedback sensor signal through the cost function of the full band of the formula (III),
Figure FDA0002512025290000034
wherein n is an iterative index through an adaptive algorithm;
the above-mentioned
Figure FDA0002512025290000035
Whereinv(n)＝A(n)+Sj(n)·T2Wherein A (n) is the final noise field formed by the initial noise source after transmission through the interior space of the cigarette machine;
the step thirteen concretely comprises the following steps of,
step 13.1, presetting the noise value (n) ═ C of the error feedback sensor, where C is the noise value of the area where the error feedback sensor is located, and judging (n) and [ a (n) — Sj(n)T2]2When [ A (n) -S ] isj(n)T2]2When the value is more than C, the step 13.2 is entered, when the value is [ A (n) -S [)j(n)T2]2When the temperature is less than or equal to C, entering the step 13.4;
step 13.2, mixing w1(k)，......，wg(k)，......，wL(k) Respectively substituting formula (IV) to respectively obtain new w1(k+1)，......，wg(k+1)，......，wLL adaptive weight coefficients of (k +1), μ being a convergence factor, are entered in step 13.3,
w (k +1) ═ w (k) + [ μ r (k) e (k) ] formula (IV);
step 13.3, let w1(k+1)＝w1(k)，......，wg(k+1)＝wg(k)，......，wL(k+1)＝wL(k) Respectively taking the weight vectors of the filter, and entering the step eight;
step 13.4, let Sj(n)＝Sj' (n), go to step fourteen;
the C value ranges from 0dB to 0.001 dB.
2. The oblique range hood with the iterative upgrade function according to claim 1, characterized in that: the wireless signals of the signal transceiver and the external remote equipment are WIFI signals, 4G data network signals, 5G data network signals or Bluetooth signals.
3. The oblique range hood with the iterative upgrade function according to claim 2, characterized in that: the external remote equipment is an intelligent sound box, a refrigerator, a mobile phone or a tablet personal computer.
4. The oblique range hood with the iterative upgrade function according to claim 3, characterized in that: the cigarette making machine is characterized by also comprising a visual detection system for monitoring the smoke condition, wherein the visual detection system is assembled on the cigarette making machine main body and is electrically connected with a cigarette making machine main board of the cigarette making machine main body;
the three-dimensional space sound field noise reduction device is provided with a three-dimensional space sound field noise reduction unit and a self-adaptive noise reduction control unit, the self-adaptive noise reduction control unit is electrically connected with the three-dimensional space sound field noise reduction unit, the three-dimensional space sound field noise reduction unit is electrically connected with a main board of the range hood, and the three-dimensional space sound field noise reduction unit and the self-adaptive noise reduction control unit are respectively assembled on a main body of the range hood;
the three-dimensional space sound field noise reduction unit is provided with a noise collection sensor, a loudspeaker and an acoustic resonator, the loudspeaker is installed inside the acoustic resonator, the acoustic resonator is fixedly assembled below an air draft assembly of the cigarette machine main body, the noise collection sensor is fixedly installed on the air draft assembly, and the noise collection sensor and the loudspeaker are respectively and electrically connected with the self-adaptive noise reduction control unit;
the self-adaptive noise reduction control unit is arranged as a band-pass filter, the band-pass filter is assembled inside the cigarette machine main body, the noise collection sensor and the loudspeaker are respectively electrically connected with the band-pass filter, and the band-pass filter is electrically connected with a cigarette machine main board, WIFI or a serial port.
5. The oblique range hood with the iterative upgrade function of claim 4, wherein: the vision detection system is provided with an infrared light supplementing device, a camera device, a relay, a main control chip and an anti-fuzzy lens, wherein the infrared light supplementing device, the camera device and the relay are respectively and electrically connected with the main control chip, the main control chip is electrically connected with a main board of the range hood, the infrared light supplementing device and the camera device are respectively assembled outside the main body of the range hood and face a stove, and the anti-fuzzy lens is assembled on the outer surface of the camera device;
the camera device acquires smoke image information of an external stove area of a current cigarette machine main body and transmits the smoke image information to the main control chip, the main control chip determines a target area of a current image through a detection algorithm and determines a current smoke concentration level to obtain a processing signal, the main control chip transmits the processing signal to a cigarette machine main board, and the cigarette machine main board adjusts the rotating speed of an air draft assembly or the telescopic length of a rectifying plate assembled on the cigarette machine main body;
the cigarette machine mainboard feeds back the gear number adjusting processing signal to the band-pass filter, and the band-pass filter receives the processing signal of the cigarette machine mainboard and adjusts the noise reduction strategy.
6. The oblique range hood with the iterative upgrade function of claim 5, wherein: the cigarette machine main body is provided with a low-damping air box for reducing broadband vibration, and the low-damping air box is assembled in the cigarette machine main body;
the low-damping air bellow is provided with a plurality of air bellow plates and a noise filtering device, the air bellow plates are spliced into a three-dimensional structure, and the noise filtering device is assembled on the inner surface of the air bellow plates;
the air draft assembly is positioned inside a full-surrounding structure formed by a filter screen of the air inlet and the low-damping air box; or
The air draft assembly is positioned in a semi-enclosed structure which is composed of low-damping bellows and at least has two completely opened structural surfaces;
the air draft assembly is provided with a wind wheel, a volute and flow guide covers used for guiding airflow to enter two sides of the wind wheel, the flow guide covers and the wind wheel are fixedly installed on the volute, the wind wheel is assembled inside the volute, the volute is fixedly assembled inside the low-damping wind box, and the wind wheel is electrically connected with a main board of the range hood.
7. The oblique range hood with the iterative upgrade function of claim 6, wherein: the self-adaptive noise reduction control unit is also provided with the error return sensor, the error return sensor is fixedly arranged in the smoke machine main body and is positioned below the low-damping air box, and the error return sensor is electrically connected with the band-pass filter;
the error return sensor is located below the speaker.
8. The oblique range hood with the iterative upgrade function according to claim 7, characterized in that: k loudspeakers and acoustic resonance boxes are arranged, wherein K is more than or equal to 1 and is a positive integer, and the loudspeakers and the acoustic resonance boxes are in one-to-one correspondence;
the acoustic resonance box is fixedly assembled on the flow guide cover and suspended at the bottom of the low-damping air box;
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 with the air inlet, and the beta is less than or equal to 60 degrees;
the noise acquisition sensors are fixed on the air guide sleeve, A is more than or equal to 4, A is a positive integer and is more than or equal to K;
the error feedback sensors are provided with Q numbers, Q is a positive integer and is more than or equal to 1;
the noise acquisition sensor is positioned above the loudspeaker;
d band-pass filters are arranged, 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 plurality of panel main bodies and reinforcing structures, wherein the panel main bodies are used for eliminating noise through holes;
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 which is assembled between the low-damping noise filtering plate and the wall surface of the low-damping air box;
the outer surface of the low-damping air box 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.
9. A noise reduction method of an inclined range hood with an iterative upgrade function is characterized in that: the noise reduction method of the range hood as set forth in claim 8.
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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
CN201810772871.3A Active CN108916952B (en) 2018-03-08 2018-07-14 Range hood with three-dimensional space sound field noise reduction device and noise reduction method
CN201810772839.5A Active CN108731073B (en) 2018-03-08 2018-07-14 Lampblack absorber with lampblack separation device and noise reduction method
CN201810772881.7A Active CN108916953B (en) 2018-03-08 2018-07-14 Range hood with Hilbert transform noise reduction function and noise reduction method
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CN201810772840.8A Active CN108954434B (en) 2018-03-08 2018-07-14 Range hood with wavelet transformation noise reduction function and noise reduction method
CN201810781598.0A Active CN108954443B (en) 2018-03-08 2018-07-14 Range hood with active and passive noise reduction devices and noise reduction method
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CN201810772881.7A Active CN108916953B (en) 2018-03-08 2018-07-14 Range hood with Hilbert transform noise reduction function and noise reduction method
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