CN108915546B - Active and passive combined noise reduction glass plate and active noise reduction method thereof - Google Patents
Active and passive combined noise reduction glass plate and active noise reduction method thereof Download PDFInfo
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- CN108915546B CN108915546B CN201810932919.2A CN201810932919A CN108915546B CN 108915546 B CN108915546 B CN 108915546B CN 201810932919 A CN201810932919 A CN 201810932919A CN 108915546 B CN108915546 B CN 108915546B
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- E—FIXED CONSTRUCTIONS
- E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
- E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
- E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
- E06B5/20—Doors, windows, or like closures for special purposes; Border constructions therefor for insulation against noise
Abstract
The invention discloses a noise reduction glass plate with active and passive combination, which comprises the following components: a first glass plate vertically disposed; the active noise reducer shell is adsorbed on the inner side of the first glass plate, the center of the active noise reducer shell protrudes to one side far away from the first glass plate to form a cylinder structure, and supporting arms are arranged at four corners of the active noise reducer shell; a secondary speaker provided on the support arm with an opening direction facing a side away from the first glass plate; a vibration sensor disposed between the first glass plate and the active noise reducer housing, and both sides of which are respectively in contact with the first glass plate and the active noise reducer housing; and the processor is arranged in the cylindrical structure and is used for receiving the detection data of the vibration sensor and controlling the secondary loudspeaker to emit offset noise. The invention also provides an active noise reduction method, which is based on the fuzzy control method, determines the noise canceling frequency of the secondary loudspeaker output according to the vibration frequency and the vibration amplitude of the first glass plate, and improves the noise reduction effect.
Description
Technical Field
The invention relates to the technical field of active noise reduction, in particular to an active and passive combined noise reduction glass plate and an active noise reduction method thereof.
Background
With the progress of urban traffic, which is accompanied by the development of social productivity, the noise generated by urban traffic causes buildings located at airports, railways or on highways, especially buildings located at streets, apartments, hotels, office buildings, etc., and those nearby markets, factories, and downtimes, to suffer from noise intrusion throughout the year.
In modern buildings, the sound insulation of the wall body can generally meet the requirements of sound insulation and noise reduction. The noise in the room is mainly introduced from a relatively thin place such as a door, a window, etc. Thus, if we increase the noise reduction level in a relatively thin place such as a door, window, etc., then the noise that is introduced into the room will be greatly reduced.
The invention provides a novel noise reduction glass plate structure, which adopts a mode of combining active noise reduction and passive noise reduction, wherein the passive noise reduction mainly processes a high-frequency part of noise, and adopts an active noise reduction technology to compensate low-frequency noise with poor passive noise reduction processing effect, so that noise reduction in a wider frequency band is realized, and a better noise reduction effect is obtained.
Disclosure of Invention
The invention aims to design and develop a noise reduction glass plate with active and passive combination, which can collect the vibration frequency of a first glass plate and release offset noise with opposite phase and same frequency, thereby further reducing the noise.
The invention further aims to design and develop an active noise reduction method of the active and passive combined noise reduction glass plate, and the noise cancellation frequency of the secondary loudspeaker is determined according to the vibration frequency and the vibration amplitude of the first glass plate based on a fuzzy control method, so that the noise reduction effect is improved.
The technical scheme provided by the invention is as follows:
a passively and actively bonded noise reducing glass sheet comprising:
a first glass plate vertically disposed;
the active noise reducer shell is adsorbed on the inner side of the first glass plate, the center of the active noise reducer shell protrudes to one side far away from the first glass plate to form a cylinder structure, and supporting arms are arranged at four corners of the active noise reducer shell;
a secondary speaker provided on the support arm with an opening direction facing a side away from the first glass plate;
a vibration sensor disposed between the first glass plate and the active noise reducer housing, and both sides of which are respectively in contact with the first glass plate and the active noise reducer housing;
and the processor is arranged in the cylindrical structure and is used for receiving the detection data of the vibration sensor and controlling the secondary loudspeaker to emit offset noise.
Preferably, the method further comprises:
a second glass plate which is provided outside the first glass plate and whose lower portion is provided obliquely to the outside;
wherein the thickness of the first glass plate is greater than the thickness of the second glass plate.
Preferably, the processor comprises:
a processing module disposed within the cylindrical structure and disposed proximate the first glass sheet;
an error microphone disposed at the center of the cylindrical structure end face away from the first glass plate;
and a storage battery arranged in the cylindrical structure and positioned between the processing module and the error microphone.
Preferably, the method further comprises:
a suction cup disposed between the first glass plate and the support arm for sucking the active noise reducer housing onto the first glass plate;
the frame is provided with grooves at intervals in the circumferential direction and used for fixing the first glass plate and the second glass plate;
the sealing strip is arranged in the groove and used for sealing the first glass plate and the frame and the second glass plate and the frame respectively;
and the silencing sheet is arranged between the first glass plate and the second glass plate and is adsorbed on the frame.
Preferably, the vibration sensor is disposed at the center of the active noise reducer housing.
Preferably, the thickness of the first glass plate is 6 to 8mm, the thickness of the second glass plate is 2 to 3mm, and the distance between the first glass plate and the second glass plate is 40 to 50mm.
Preferably, the width of the silencing sheet is 10-30 mm, and the distance between the error microphone and the first glass plate is 20-30 mm.
An active noise reduction method for an active and passive combined noise reduction glass plate comprises a fuzzy controller:
frequency H of vibration of the first glass plate g And a vibration amplitude A input fuzzy controller, the fuzzyVibration frequency H of first glass plate in controller g And the vibration amplitude A is divided into 7 grades;
the fuzzy controller outputs the offset noise frequency H emitted by the secondary loudspeaker s The output is divided into 7 grades;
the vibration frequency H of the first glass plate g Is [1,2.5 ]]The quantization factor is 400; the fuzzy domain of vibration amplitude A of the first glass plate is [0, 1]]A quantification factor of 0.05; output of cancellation noise frequency H emitted by secondary speaker s Is [1,2.5 ]]The quantization factor is 400;
the fuzzy set of inputs and outputs is NB, NM, NS,0,PS,PM,PB.
Preferably, the method further comprises a fuzzy PID controller:
ideal ambient noise frequency after noise cancellation input to the ith noise reduction processAnd the ambient noise frequency H after noise cancellation si The deviation e and the deviation change rate ec of the output PID are input into a PID controller to cancel the noise frequency H s Error compensation control of (a).
It is preferred that the composition of the present invention,
ideal ambient noise frequency after the noise cancellationAnd the ambient noise frequency H after noise cancellation si The fuzzy argument of the deviation e of (2) is [ -1,1]The quantification factor is 50; the fuzzy universe of variation rate of deviation ec is [ -3,3]The quantification factor is 10;
the fuzzy argument of the proportionality coefficient of the output PID is [ -1,1], and the quantification factor is 0.1; the fuzzy theory domain of the proportional integral coefficient is [ -1,1], and the quantification factor is 0.1; the fuzzy argument of the differential coefficient is [ -1,1], its quantification factor is 0.0001;
the deviation e and the deviation change rate ec are divided into 7 grades; the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are divided into 7 grades;
the fuzzy set of inputs and outputs of the fuzzy PID controller is { NB, NM, NS,0,PS,PM,PB }.
The beneficial effects of the invention are as follows:
1. the invention has the technical advantages that active noise reduction and passive noise reduction are adopted at the same time, so that the noise reduction frequency band range is effectively widened; the non-acoustic original is adopted to acquire the noise source, so that the problem of 'acoustic feedback' is directly avoided; the broadband error noise signals are decomposed into a plurality of narrowband signals with equal bandwidths through a plurality of bandpass filters, and each narrowband signal is controlled simultaneously, so that the noise reduction effect of the broadband noise is effectively improved; the basic structure of the glass sheet is innovatively designed to more effectively reduce noise transmission using high performance materials, with non-parallel configuration of the glass sheet greatly reducing noise transmission. The invention can effectively weaken the noise from being transmitted into the room, and provides a more comfortable environment for life, study and work of people.
2. The active noise reduction method of the active and passive combined noise reduction glass plate provided by the invention is used for determining the noise cancellation frequency H of the secondary loudspeaker output based on the fuzzy control method according to the vibration frequency and the vibration amplitude of the first glass plate s And the noise reduction effect is improved.
Drawings
Fig. 1 is a schematic structural view of a noise reduction glass window with active and passive combination according to the present invention.
FIG. 2 is a front view of an active noise reduction system for an actively engaged noise reduction glazing according to the present invention.
Fig. 3 is a diagram of a multi-channel active noise reduction control system according to the present invention.
Fig. 4 is a control schematic of the fuzzy controller and fuzzy PID controller according to the present invention.
FIG. 5 shows the vibration frequency H of the input first glass plate of the fuzzy controller according to the present invention g Membership function graph of (a).
FIG. 6 is a graph of membership function of vibration amplitude A of an input first glass plate of a fuzzy controller according to the present invention.
FIG. 7 is a graph showing the cancellation noise frequency H emitted by the output secondary speaker of the fuzzy controller according to the present invention s Membership function graph of (a).
FIG. 8 is a membership function chart of the input bias e of the fuzzy PID controller according to the invention.
Fig. 9 is a membership function graph of the input bias change rate ec of the fuzzy PID controller according to the present invention.
FIG. 10 shows the output scaling factor K of the fuzzy PID controller according to the invention p Membership function graph of (a).
FIG. 11 shows the output proportional-integral-coefficient K of the fuzzy PID controller according to the invention i Membership function graph of (a).
FIG. 12 shows the differential coefficient K of the output of the fuzzy PID controller according to the invention d Membership function graph of (a).
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
As shown in fig. 1 and 2, the present invention provides an active and passive combined noise reduction glass plate, which includes an active noise reduction system and a passive noise reduction system, wherein the active noise reduction system includes: a first glass plate 100 disposed vertically; the active noise reducer housing 110 is adsorbed on the inner side of the first glass plate 100, the center of the active noise reducer housing protrudes towards the side far away from the first glass plate 100 and is in a cylindrical structure 120, supporting arms 130 are arranged at four corners, secondary speakers 140, namely, 4 secondary speakers 140, are arranged on the supporting arms 130, and the opening direction of the active noise reducer housing faces towards the side far away from the first glass plate 100, and is used for generating canceling noise with the same vibration frequency as the first glass plate 100 and opposite phase to reduce noise. Between the first glass plate 100 and the active noise reducer housing 110, a vibration sensor 150 is provided, both sides of which are respectively in contact with the first glass plate 100 and the active noise reducer housing 110, and the vibration sensor 150 is preferably provided at the center of the active noise reducer housing 110. A processor is disposed within the cylindrical structure 120 for receiving the detection data of the vibration sensor 150 and controlling the secondary speaker 140 to emit canceling noise.
The processor includes: a DSP processing module 160 disposed within the cylindrical structure 120 and disposed proximate the first glass sheet 100; the error microphone 170 is arranged in the center of the end face of the cylindrical structure 120 far away from the first glass plate 100, namely, the error microphone 170 is positioned at the farthest distance from the first glass plate 100 of the central cylindrical bulge 120 on the active noise reducer shell 110, and the distance between the error microphone 170 and the first glass plate 100 is 20-30 mm, so as to collect the ambient noise frequency after noise cancellation; a storage battery 180 disposed in the cylindrical structure 120 and between the DSP processing module 160 and the error microphone 140, wherein the storage battery 180 is separated from the DSP processing module 160 by a plastic plate for supplying power to the active noise reduction system.
The vibration sensor 150 and the error collecting microphone 170 are signal input modules, the vibration sensor 150 is mainly used for collecting the vibration signals (including vibration frequency and vibration amplitude) of the first glass plate 100 caused by the attenuated noise, the vibration signals are input to the DSP processing module, and the error collecting microphone 170 is used for collecting the environmental sound signals (i.e. the environmental sound frequency) after noise cancellation and inputting the environmental sound signals to the DSP processing module to update the weight; the DSP processing module processes the input signals and transmits the generated corresponding output signals to the loudspeaker sounding module, as shown in fig. 3; the sound generating module of the secondary speaker 140 includes a plurality of secondary speakers facing the indoor, and is mainly used for generating cancellation audio signals.
The novel double-layer glass window structure of the passive noise reduction system is characterized in that two glass plates with different thicknesses are selected and used, the novel double-layer glass window structure comprises a first glass plate 100 and a second glass plate 200, the first glass plate 100 is vertically arranged, the second glass plate 200 is arranged on the outer side of the first glass plate 10, and the lower portion of the second glass plate is arranged in an outwards inclined mode. Of course, the glass frame 300 further comprises grooves 310 circumferentially spaced to accommodate and fix the first glass plate 100 and the second glass plate 200, and sealing strips 320 are disposed in the grooves 310 to seal the first glass plate 100 and the frame 310 and the second glass plate 200 and the frame 310, respectively.
The thickness of the second glass plate 200 is 2 mm-3 mm, the thickness of the first glass plate 100 is 6 mm-8 mm, and the frequency of the anastomosis effect can be staggered by selecting glass plates with different thicknesses, so that the influence of the anastomosis effect on the noise reduction effect is weakened. The second glass plate 200 is disposed outside the first glass plate 100 and has a certain angle with the vertical direction, and the first glass plate 100 is disposed along the vertical direction to weaken the resonance effect of the two glass plates.
The distance between the two glass plates is 40 mm-50 mm, a layer of sound-absorbing sponge with the width of 1-3cm, namely, a sound-absorbing sheet 210 is attached to the surface of the peripheral frame between the two glass plates, and the sound-absorbing sponge 210 can properly inhibit middle-high frequency noise between the two glass plates. Soft connection is adopted between the two layers of glass plates, so that the phenomenon of sound bridge is avoided. The glass window body frame 310 is made of plastic steel materials, the door and window assembly is made of welding technology, and a multi-cavity structure sealed by the plastic steel materials has a shielding effect on noise. And 320 strips of ethylene propylene diene monomer sealant are adopted to seal the plastic steel frame and the glass plate.
The passive noise reduction system and the active noise reduction system are connected by four vacuum suckers 190, namely four corners of the active noise reducer shell 110 are adsorbed on the inner surface of the first glass plate 100 through the suckers 190, the suckers are convenient to detach, and the combination and the separation of the active noise reduction system and the glass window body are realized according to the requirement.
The signal input module of the active noise reduction system adopts a vibration sensor, and the problem of acoustic feedback is avoided due to the non-acoustic sensor, so that the ageing and nonlinearity of a reference sensor (microphone) are avoided, and meanwhile, the reference signal is not acoustic wave and is synthesized by a signal generator in the system through known frequency and phase by adopting an adaptive notch filter method.
The residual middle-low frequency broadband noise of the external sound source after the sound absorption and the sound insulation of the double-layer glass window is eliminated by the active control system, and the feedback type system only can offset the narrow-band noise signal, namely the periodic noise, so that the noise is eliminated by the feedforward type active noise control system without the limitation on the noise signal.
Working principle:
the external environmental noise is firstly transmitted to the second glass plate 200, and because the characteristic impedance of the air is different from that of the glass plate, when the sound wave passes through the second glass plate 200, the sound wave is attenuated by the air and the second glass plate 200 in a twice reflection way, and the absorption effect of the silencing patch 210 enhances the attenuation of the sound energy; the sound wave is transmitted to the first glass plate 100, and the transmitted sound energy is attenuated again after two reflections, so that the total transmission loss is larger; after the external environmental noise passes through the sound insulation and the sound absorption of the double-layer glass window, the high-frequency part in the noise is well eliminated, the rest middle-low frequency noise causes the vibration of the first glass plate 100, the vibration of the first glass plate 100 is measured by the vibration sensor 150 and converted into an electric signal (comprising the vibration frequency and the vibration displacement) to be transmitted into the DSP processing module 160, the DSP processing module 160 generates the signal with the same frequency as the noise after processing according to the transmitted signal, the signal with the opposite phase is transmitted to the secondary loudspeaker 140, the noise cancellation signal is sent by the secondary loudspeaker 140 to realize the noise reduction effect, and meanwhile, the error microphone 170 collects the environmental noise after noise cancellation and transmits the signal into the DSP processing module 160 to finish the updating of the weight of the filter, and the noise reduction effect is continuously improved.
The traditional single-channel active noise control system has no obvious effect when eliminating broadband noise. In order to solve the problem, the active noise reduction system firstly preprocesses the error noise signal, namely, the error noise signal is decomposed into a plurality of narrow-band signals with equal bandwidth through a plurality of band-pass filters, then, each narrow-band signal is simultaneously controlled, and each cancellation noise signal output by the system is simultaneously sent out through a plurality of secondary speakers.
The invention has the technical advantages that active noise reduction and passive noise reduction are adopted at the same time, so that the noise reduction frequency band range is effectively widened; the non-acoustic original is adopted to acquire the noise source, so that the problem of 'acoustic feedback' is directly avoided; the broadband error noise signals are decomposed into a plurality of narrowband signals with equal bandwidths through a plurality of bandpass filters, and each narrowband signal is controlled simultaneously, so that the noise reduction effect of the broadband noise is effectively improved; the basic structure of the glazing has been innovatively designed to more effectively reduce noise transmission using high performance materials, with the non-parallel arrangement of the glass sheets greatly reducing noise transmission. The invention can effectively weaken the noise from being transmitted into the room, and provides a more comfortable environment for life, study and work of people.
The invention also provides an active noise reduction method of the active and passive combined noise reduction glass plate, which comprises a fuzzy controller and a fuzzy PID controller, wherein the control method is shown in figure 4 and comprises the following steps of:
step 1: frequency H of vibration of the first glass plate g Vibration amplitude A and cancellation noise frequency H emitted by secondary speaker s Performing fuzzy processing; in the absence of control, the first glass plate vibrates at a frequency H g Is [1,2.5 ]]The quantization factor is 400; the fuzzy domain of vibration amplitude A of the first glass plate is [0, 1]]A quantification factor of 0.05; output of cancellation noise frequency H emitted by secondary speaker s Is [1,2.5 ]]The quantization factor is 400; in order to ensure the control accuracy and realize better control, experiments are repeatedly carried out to determine the optimal input and output levels, wherein the vibration frequency H of the first glass plate g And the vibration amplitude A is divided into 7 grades; output of cancellation noise frequency H emitted by secondary speaker s The output is divided into 7 grades; the fuzzy sets of input and output are both NB, NM, NS,0,PS,PM,PB. Wherein, the control rule of the fuzzy controller is:
(1) Vibration frequency H of first glass plate g In certain cases, the amplitude A of the vibration of the first glass plate increases, and the frequency H of the cancellation noise emitted by the secondary speaker needs to be increased s ；
(2) The vibration amplitude A of the first glass plate is constant, and the vibration frequency H of the first glass plate g Increase in the frequency H of the cancellation noise emitted by the secondary speaker s ；
The specific control rules of the fuzzy control are shown in the table I.
Fuzzy control table for canceling noise frequency emitted by secondary loudspeaker
The fuzzy controller inputs the vibration frequency H of the first glass plate g And vibration amplitude A, obtaining offset noise frequency H emitted by output secondary speaker of fuzzy controller by fuzzy control rule table s Cancellation noise frequency H emitted by secondary speaker s And de-blurring by using a gravity center method.
Step 2: fuzzy PID controller
Ideal ambient noise frequency after cancellation of noise in the ith noise reduction processAnd the ambient noise frequency H after noise cancellation si The deviation e, the deviation change rate ec, the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are subjected to fuzzy processing, and when the control is not performed, the fuzzy argument of the deviation e is [ -1,1]The quantization factor is 50; fuzzy universe of variation rate of deviation ec [ -3,3]The quantization factor is 10; proportional coefficient K of PID p The ambiguity domain of (1) is [ -1,1]The quantization factor is 0.1; proportional integral coefficient K i The ambiguity domain of (1) is [ -1,1]The quantization factor is 0.1; differential coefficient K d The ambiguity domain of (1) is [ -1,1]The quantification factor is 0.0001. In order to ensure the control precision and realize better control, experiments are repeatedly carried out, and the optimal input and output levels are determined, wherein the deviation e and the deviation change rate ec in the fuzzy controller are divided into 7 levels; the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are divided into 7 grades; the fuzzy sets of input and output are { NB, NM, NS,0,PS,PM,PB }, and the membership functions of input and output are triangle membership functions, see in detail fig. 5-12. The fuzzy control rule is as follows:
1. when the deviation |e| is large, K is increased p Thereby the deviation is reduced rapidly, but a larger deviation change rate is generated at the same time, a smaller K is adopted d K is usually taken i ＝0；
2. When the values of |ec| and |e| are at medium, K is suitably reduced to avoid overshoot p To take the value of K i Smaller, select proper sizeK of (2) d ；
3. When the deviation |e| is small, K is increased p K i To avoid unstable oscillation around the steady state value of the system, the value of (1) is usually set to be smaller when |ec| is larger d The method comprises the steps of carrying out a first treatment on the surface of the When |ec| is small, a large K is taken d The method comprises the steps of carrying out a first treatment on the surface of the The specific fuzzy control rules are shown in tables II, III and IV.
Table II proportional coefficient K of PID p Fuzzy control table of (a)
Table three PID proportional integral coefficient K i Fuzzy control table of (a)
Differential coefficient K of Table four PID d Fuzzy control table of (a)
Ideal ambient noise frequency after noise cancellation input to the ith noise reduction processAnd the ambient noise frequency H after noise cancellation si The deviation e and the deviation change rate ec of the output PID, the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are defuzzified by a height method, and the output PID controller is used for counteracting the noise frequency H s The control formula is as follows:
experiments repeatedly determine that the fuzzy PID controller raises secondary levelCancellation noise frequency H emitted by acoustic device s Accurately controlling the cancellation noise frequency H emitted by the secondary speaker s Is the sum of the output frequency of the fuzzy controller and the frequency error compensation value of the PID controller, so that the noise cancellation frequency H emitted by the secondary speaker s Can be precisely controlled to ensure that the deviation is less than 0.1 percent.
The active noise reduction method of the active and passive combined noise reduction glass plate provided by the invention is used for determining the noise cancellation frequency H of the secondary loudspeaker output based on the fuzzy control method according to the vibration frequency and the vibration amplitude of the first glass plate s And the noise reduction effect is improved.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (4)
1. An active noise reduction method for an active and passive combined noise reduction glass plate, which uses the active and passive combined noise reduction glass plate, is characterized by comprising a fuzzy controller:
frequency of vibration of the first glass plateH g And vibration amplitudeAInputting a fuzzy controller, wherein the fuzzy controller is used for controlling the vibration frequency of the first glass plateH g And vibration amplitudeADividing into 7 grades;
the fuzzy controller outputs the frequency of the offset noise emitted by the secondary loudspeakerH s The output is divided into 7 grades;
the vibration frequency of the first glass plateH g Is [1,2.5 ]]The quantization factor is 400; vibration amplitude of the first glass plateAIs [0, 1]]A quantification factor of 0.05; output of cancellation noise frequencies from secondary speakersH s Is [1,2.5 ]]Its quantization factor is 400；
The fuzzy set of input and output is { NB, NM, NS,0,PS,PM,PB };
the method also comprises the steps of:
input the firstiIdeal ambient noise frequency after noise cancellation for noise reduction processAnd the ambient noise frequency after noise cancellationH si Deviation of (2)eRate of change of deviationecThe proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are input into a PID controller to cancel noise frequencyH s Error compensation control of (2);
ideal ambient noise frequency after the noise cancellationAnd the ambient noise frequency after noise cancellationH si Deviation of (2)eThe ambiguity domain of (1) is [ -1,1]The quantification factor is 50; the rate of change of the deviationecThe fuzzy discourse domain of [ -3,3]The quantification factor is 10;
the fuzzy argument of the proportionality coefficient of the output PID is [ -1,1], and the quantification factor is 0.1; the fuzzy theory domain of the proportional integral coefficient is [ -1,1], and the quantification factor is 0.1; the fuzzy argument of the differential coefficient is [ -1,1], its quantification factor is 0.0001;
the deviation iseAnd rate of change of deviationecDividing into 7 grades; the proportional coefficient, the proportional integral coefficient and the differential coefficient of the output PID are divided into 7 grades;
the fuzzy set of the input and output of the fuzzy PID controller is { NB, NM, NS,0,PS,PM,PB };
wherein, the active and passive combination noise reduction glass plate comprises:
a first glass plate vertically disposed;
the active noise reducer shell is adsorbed on the inner side of the first glass plate, the center of the active noise reducer shell protrudes to one side far away from the first glass plate to form a cylinder structure, and supporting arms are arranged at four corners of the active noise reducer shell;
a secondary speaker provided on the support arm with an opening direction facing a side away from the first glass plate;
the vibration sensor is arranged between the first glass plate and the active noise reducer shell, two sides of the vibration sensor are respectively contacted with the first glass plate and the active noise reducer shell, and the vibration sensor is arranged at the center of the active noise reducer shell;
a processor disposed within the cylindrical structure for receiving the detection data of the vibration sensor and controlling the secondary speaker to emit canceling noise;
a second glass plate which is provided outside the first glass plate and whose lower portion is provided obliquely to the outside;
wherein the thickness of the first glass plate is greater than the thickness of the second glass plate;
the thickness of the first glass plate is 6-8 mm, the thickness of the second glass plate is 2-3 mm, and the distance between the first glass plate and the second glass plate is 40-50 mm.
2. The active noise reduction method of an actively engaged noise reducing glass sheet according to claim 1, wherein said processor comprises:
a processing module disposed within the cylindrical structure and disposed proximate the first glass sheet;
an error microphone disposed at the center of the cylindrical structure end face away from the first glass plate;
and a storage battery arranged in the cylindrical structure and positioned between the processing module and the error microphone.
3. The active noise reduction method of an active and passive bonded noise reduction glass sheet according to claim 2, wherein the active and passive bonded noise reduction glass sheet further comprises:
a suction cup disposed between the first glass plate and the support arm for adsorbing the active noise reducer housing on the first glass plate;
the frame is provided with grooves at intervals in the circumferential direction and used for fixing the first glass plate and the second glass plate;
the sealing strip is arranged in the groove and used for sealing the first glass plate and the frame and the second glass plate and the frame respectively;
and the silencing sheet is arranged between the first glass plate and the second glass plate and is adsorbed on the frame.
4. The active noise reduction method of the active and passive combined noise reduction glass plate according to claim 3, wherein the width of the noise reduction sheet is 10-30 mm, and the distance between the error microphone and the first glass plate is 20-30 mm.
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| CN112802442A (en) * | 2021-04-15 | 2021-05-14 | 上海鹄恩信息科技有限公司 | Control method of electrostatic field noise reduction glass, electrostatic field noise reduction glass and storage medium |
| CN113488015B (en) * | 2021-06-23 | 2024-03-15 | 武汉理工大学 | Active control system and control method for mixing structural sound and air sound of cab of excavator |
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| CN108915546A (en) | 2018-11-30 |
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