CN105298933A - Active noise control device for axial fan - Google Patents
Active noise control device for axial fan Download PDFInfo
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- CN105298933A CN105298933A CN201510580336.4A CN201510580336A CN105298933A CN 105298933 A CN105298933 A CN 105298933A CN 201510580336 A CN201510580336 A CN 201510580336A CN 105298933 A CN105298933 A CN 105298933A
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Abstract
An active noise control device for an axial fan comprises a first sound source generator, a second sound source generator, a rotation speed sensor, a first error sensor, a second error sensor and a controller, wherein the first sound source generator, the second sound source generator, the rotation speed sensor, the first error sensor and the second error sensor are all electrically connected with the controller. The active noise control device for the axis fan has the following characteristics: (1) noise in a specific working range can be effectively reduced, and the working environment is improved; (2) an active noise control way is adopted, and compared with a passive way, the active way can improve the noise reduction effect under the condition that the radiating effect is not influenced; and (3) the active noise control way is adopted, so that the environmental suitability of a noise elimination device can be improved, and noise can be effectively reduced after the audio-frequency property of a controlled object is changed.
Description
Technical field
The present invention relates to electronic equipment dissipating heat technical field, particularly a kind of axial fan active noise control device.
Background technique
Axial fan is widely used in the heat radiation of electronic equipment, is the main source of electrical device noise.Research shows, the noise of axial fan forms primarily of three parts: the noise that the friction of bearing and vibration produce, fan blade vibrate the fricative noise of noise and blade and the air produced.Under normal circumstances, the noise produced with air friction is occupied an leading position, and its noise fundamental frequency is relevant with the number of blade with the rotating speed of fan, and frequency generally more than 1000Hz, can not belong to low-frequency noise.If adopt traditional passive noise reduction mode, can take very large space, noise reduction cost is very high, even can reduce radiating effect, and simultaneously when fan noise characteristic changes because of other reasons, noise reduction can reduce greatly, and environmental suitability is too poor.
Summary of the invention
In view of this, the invention provides a kind of can the axial fan active noise control device of active control of noise.
A kind of axial fan active noise control device, it comprises first time sound source generators, second time sound source generators, speed probe, the first error pick-up, the second error pick-up, controller;
Sound source generators, second time sound source generators, speed probe, the first error pick-up, the second error pick-up are all electrically connected with controller for the first time;
Speed probe is used for the synchronous electronic pulse signal obtaining rotation speed of the fan, and the electronic pulse signal of rotation speed of the fan is sent to controller;
First error pick-up is positioned at the noise figure of fan first evaluation point for obtaining, and the noise figure of the first evaluation point is sent to controller;
Second error pick-up is positioned at the noise figure of fan second evaluation point for obtaining, and the noise figure of the second evaluation point is sent to controller;
Controller is used for generating the first control signal, the second control signal according to the electronic pulse signal of the rotating speed received, and the first control signal is sent to first time sound source generators, the second control signal is sent to second time sound source generators; And for generating the first compensating signal according to the first control signal, the first compensating signal is sent to second subprime sound source generators, generate the second compensating signal according to the second control signal, the second compensating signal is sent to first time sound source generators;
First time, sound source generators was for offsetting the noise figure of the first evaluation point according to the first control signal sounding, and compensated the secondary sound source of the second evaluation point place second subprime sound source generators generation to the impact of the first error pick-up according to the second compensating signal;
Second time sound source generators is used for the noise figure of offsetting the first evaluation point according to the second control signal sounding, and compensates the secondary sound source of first the level sound source generators generation in the first evaluation point place to the impact of the second error pick-up according to the first compensating signal.
In axial fan active noise control device of the present invention, controller comprises the first reference generator, the second reference generator, the first sef-adapting filter, the second sef-adapting filter, the first compensating filter, the second compensating filter, the first correcting filter, the second correcting filter, the first adaptive filter coefficient updating device, the second adaptive filter coefficient updating device;
First sef-adapting filter one end is electrically connected with the first reference generator, first correcting filter one end; The first sef-adapting filter the other end is electrically connected with first time sound source generators; The first correcting filter the other end is electrically connected with the first adaptive filter coefficient updating device, the first error pick-up successively;
Second sef-adapting filter one end is electrically connected with the second reference generator, second correcting filter one end; The second sef-adapting filter the other end is electrically connected with second time sound source generators; The second correcting filter the other end is electrically connected with the second adaptive filter coefficient updating device, the second error pick-up successively;
First compensating filter one end be connected electrically in the second sef-adapting filter and second time sound source generators between, the first compensating filter the other end be connected electrically in the first sef-adapting filter and first time sound source generators between;
Second compensating filter one end be connected electrically in the second sef-adapting filter and second time sound source generators between, the second compensating filter the other end be connected electrically in the first sef-adapting filter and first time sound source generators between.
In axial fan active noise control device of the present invention, described first time sound source generators be a pair loudspeaker, loudspeaker is arranged on fan both sides.
In axial fan active noise control device of the present invention, described second time sound source generators is a pair loudspeaker, and loudspeaker is arranged on both sides, Noise measarement region.
In axial fan active noise control device of the present invention, the first error pick-up is a MIC microphone, and MIC microphone is arranged on above fan.
In axial fan active noise control device of the present invention, the second error pick-up is a MIC microphone, and MIC microphone is arranged on Noise measarement overlying regions.
Axial fan active noise control device provided by the invention: 1. effectively can reduce the noise within the scope of particular job, improve working environment; 2. adopting the mode of active control of noise, noise reduction can be improved when not affecting radiating effect compared with passive mode; 3. adopt the mode of active control of noise can improve the environmental suitability of silencing equipment, can noise be effectively reduced after control object acoustic characteristic changes.
Accompanying drawing explanation
Fig. 1 is the structural representation of the axial fan active noise control device of the embodiment of the present invention;
Fig. 2 is the circuit diagram of Fig. 1 middle controller.
Embodiment
As shown in Figure 1, a kind of axial fan active noise control device, it comprises first time sound source generators, second time sound source generators, speed probe 110, first error pick-up, the second error pick-up, controller 106.In embodiments of the present invention, the number of blade of axial fan is chosen as 5.
Sound source generators, second time sound source generators, speed probe 110, first error pick-up, the second error pick-up are all electrically connected with controller 106 for the first time.
The electronic pulse signal of rotation speed of the fan for synchronously obtaining the electronic pulse signal of rotation speed of the fan, and is sent to controller 106 by speed probe 110.
Alternatively, speed probe 110 can be photoelectric sensor.Be interrupted excitation photoelectric sensor by reflective sheeting, make it send pulse signal, and this pulse signal embodies the rotating speed of fan, and be imported into controller 106.Divide from spectral characteristic and the aerodynamic noise of axial fan is divided into: rotational noise (interaction noise) and broadband noise (self noise).Rotational noise refers to relative to blade rotary system of coordinates, the noise that mutual interference between rotor blade and time dependent erratic flow causes, it is also known as interaction noise, periodic for this interaction the equally distributed fan of moving vane, thus the noise produced also is periodic, and the frequency of rotational noise is
fi＝i*n/60
I in formula---the number of blade; The rotating speed of n---fan.Therefore, its frequency is relevant with rotating speed with the gas number of blade of fan.The noise that fan turns causes and its synchronization, therefore, the pulse signal that the frequency of reference signal can send according to speed probe 110 determines.
First error pick-up is positioned at the noise figure of fan first evaluation point for obtaining, and the noise figure of the first evaluation point is sent to controller 106.Alternatively, the first error pick-up is a MIC microphone 101, and MIC microphone 101 is arranged on above fan.
Second error pick-up is positioned at the noise figure of fan second evaluation point for obtaining, and the noise figure of the second evaluation point is sent to controller 106.Alternatively, the second error pick-up is a MIC microphone 102, and MIC microphone 102 is arranged on Noise measarement overlying regions.Alternatively, MIC microphone 101 and MIC microphone 102 can be identical MIC microphone, also can be different MIC microphone.
First control signal, for generating the first control signal, the second control signal according to the electronic pulse signal of the rotating speed received, is sent to first time sound source generators by controller 106, the second control signal is sent to second time sound source generators; And for generating the first compensating signal according to the first control signal, the first compensating signal is sent to second subprime sound source generators, generate the second compensating signal according to the second control signal, the second compensating signal is sent to first time sound source generators.
First time, sound source generators was for offsetting the noise figure of the first evaluation point according to the first control signal sounding, and compensated the secondary sound source of the second evaluation point place second subprime sound source generators generation to the impact of the first error pick-up according to the second compensating signal.Alternatively, described first time sound source generators be a pair loudspeaker 103, loudspeaker is arranged on fan both sides.
Second time sound source generators is used for the noise figure of offsetting the first evaluation point according to the second control signal sounding, and compensates the secondary sound source of first the level sound source generators generation in the first evaluation point place to the impact of the second error pick-up according to the first compensating signal.Alternatively, described second time sound source generators is a pair loudspeaker 104, and loudspeaker is arranged on both sides, Noise measarement region.Alternatively, loudspeaker 103 and loudspeaker 104 can be identical loudspeaker, also can be different loudspeakers.
Alternatively, in the axial fan active noise control device described in the embodiment of the present invention, controller 106 comprises the first reference generator 107a, the second reference generator 107b, the first sef-adapting filter 108a, the second sef-adapting filter 108b, the first compensating filter 109a, the second compensating filter 109b, the first correcting filter 105a, the second correcting filter 105b, the first adaptive filter coefficient updating device 111a, the second adaptive filter coefficient updating device 111b;
First sef-adapting filter 108a one end is electrically connected with the first reference generator 107a, first correcting filter 105a one end; The first sef-adapting filter 108a the other end is electrically connected with first time sound source generators; The first correcting filter 105a the other end is electrically connected with the first adaptive filter coefficient updating device 111a, the first error pick-up successively;
Second sef-adapting filter 108b one end is electrically connected with the second reference generator 107b, second correcting filter 105b one end; The second sef-adapting filter 108b the other end is electrically connected with second time sound source generators; The second correcting filter 105b the other end is electrically connected with the second adaptive filter coefficient updating device 111b, the second error pick-up successively;
First compensating filter 109a one end be connected electrically in the second sef-adapting filter 108b and second time sound source generators between, the first compensating filter 109a the other end be connected electrically in the first sef-adapting filter 108a and first time sound source generators between;
Second compensating filter 109b one end be connected electrically in the second sef-adapting filter 108b and second time sound source generators between, the second compensating filter 109b the other end be connected electrically in the first sef-adapting filter 108a and first time sound source generators between.
First reference generator 107a, sends the first reference signal; Second reference generator 107b, sends the second reference signal; Their frequency is all determined based on the pulse signal sent by speed probe 110.First sef-adapting filter 108a, receives the first reference signal that the first reference generator 107a sends, exports the first control signal X0 to loudspeaker 103 simultaneously; Second sef-adapting filter 108b, receives the second reference signal that the second reference generator 107b sends, exports the second control signal X1 to loudspeaker 104 simultaneously.First compensating filter 109a, receives the first control signal X0, exports the first compensating signal simultaneously; Second compensating filter 109b, receives the second control signal X1, exports the second compensating signal simultaneously.First correcting filter 105a, receives the first reference signal, exports the first reference signal simultaneously; Second correcting filter 105b, receives the second reference signal, exports the second reference signal simultaneously.First adaptive filter coefficient updating device 111a, the error signal recorded according to the first reference signal and MIC microphone 101 upgrades the coefficient of the first sef-adapting filter 108a; Second adaptive filter coefficient updating device 111b, the error signal recorded according to the second reference signal and MIC microphone 102 upgrades the coefficient of the second sef-adapting filter 108b.First sef-adapting filter 108a and the second sef-adapting filter 108b filter coefficient record according to the transmission characteristics of corresponding secondary channel, for correcting reference signal, obtains two reference signals accurately; (method of measurement can be off-line identification or on-line identification).
Being further described below to the embodiment of the present invention.
The electronic pulse signal of rotation speed of the fan synchronously can be obtained by speed probe 110, and send to controller 106, then controller 106 determines the frequency of first, second reference signal, first reference generator 107a, the second reference generator 107b produce corresponding reference signal, and so the noise of respective frequencies will be lowered.These reference signals may be identical.Fan turns process is counted by photoelectric sensor 110 and exports with the form of square-wave pulse.
First reference signal is multiplied with the filter coefficient W0 of the first sef-adapting filter 108a and obtains the first control signal X0, then amplified by signal amplifier, drive first level sound source generators 103 sounding and give off as secondary sound source, offset the noise at evaluation point place, residual values measured by last first error pick-up 101.
In like manner, second reference signal is multiplied with the filter coefficient W1 of the second sef-adapting filter 108b and obtains the second control signal X1, then signal amplifier amplifies again, drive second subprime sound source generators 104 sounding and give off as secondary sound source, offset the noise at evaluation point place, residual values measured by the second last error pick-up 102.
Simultaneously, first control signal X0 is multiplied with the coefficient F0 of the first compensating filter 109a and obtains the first compensating signal, amplify after adding the second control signal X1, the secondary sound source simultaneously being sent to by the first compensating signal second subprime sound source generators 104 to compensate to produce at evaluation point place loudspeaker 103 on the impact of MIC microphone 102, i.e. the impact of channel C 01 in Fig. 2.In like manner, second control signal X is multiplied with the coefficient F1 of the second compensating filter 109b and obtains the second compensating signal, amplify after adding the first control signal X0, the secondary sound source simultaneously being sent to by the second compensating signal first level sound source generators 103 to compensate to produce at evaluation point place loudspeaker 104 on the impact of MIC microphone 101, i.e. the impact of channel C 10 in Fig. 2.
MIC microphone 101,102 detection noise, and by cable, checkout value is sent to controller 106, controller 106, first sef-adapting filter 108a, the second sef-adapting filter 108b and the first compensating filter 109a, the second compensating filter 109b then calculate first, second control signal X0, X1 according to the value of input, then first, second control signal X0, X1 are by corresponding for driving two groups loudspeaker 103,104, and the drive singal wherein for comfort noise then sends to two groups of loudspeakers 103,104 by cable.
Below the working procedure of the first correcting filter 105a, the second correcting filter 105b is described.As shown in Figure 2, suppose: the first correcting filter 105a, the second correcting filter 105b coefficient are respectively c^0 and c^1 herein; Transmission characteristics from fan loudspeaker 103 to fan place MIC microphone 101 is C00, and the transmission characteristics from loudspeaker 103 to Noise measarement region MIC microphone 102 is C01; Be C10 from Noise measarement field speaker 104 to the transmission characteristics of fan MIC microphone 101, the transmission characteristics from loudspeaker 104 to Noise measarement region MIC microphone 102 is C11.
As mentioned above, when after the transmission characteristics determining each constituent element, the secondary sound source Y0 that near fan, loudspeaker 103 sends can be expressed as at MIC microphone 101 place of fan place: Y0=(X0+F1*Xl) * C00; The secondary sound source Y1 that Noise measarement field speaker 104 sends can be expressed as at MIC microphone 101 place of fan place: Y1=(X1+F0*X0) * C10.
The secondary sound source Y3 that fan place loudspeaker 103 sends can be expressed as at MIC microphone 102 place, Noise measarement region: Y3=(X0+F1*X1) * C01; The secondary sound source Y4 that Noise measarement field speaker 104 sends can be expressed as at MIC microphone 102 place, Noise measarement region: Y3=(X1+F0*X0) * C11.
First adaptive filter coefficient updating device 111a receives the above-mentioned mixed signal detected by MIC microphone 101, and its input signal (Y0+Y1) can be expressed as
Y0+Y1＝(X0+F1*Xl)*C00+(X1+F0*X0)*C10＝(C00+F0*C10)*X0+(C10+F1*C00)*X1(1)
At this, the filter coefficient c^0 of the first correcting filter 105a represents the transmission characteristics from the output X0 of the first sef-adapting filter 108a to the first adaptive filter coefficient updating device 111a, when the filter coefficient c^0 of the first correcting filter 105a determines, it will only affect the part of the first control signal X0 impact, and can be expressed as:
c^0＝C00+F0*C10。(2)
In like manner, the second adaptive filter coefficient updating device 111b receives the mixed signal detected by MIC microphone 102, and its input signal (Y3+Y4) can be expressed as
Y3+Y4＝(C01+F0*C11)*X0+(C11+F1*C01)*X1(3)
Equally, the filter coefficient c^1 of the second correcting filter 105b represents the transmission characteristics from the output X1 of the second sef-adapting filter 108b to the second adaptive filter coefficient updating device 111b, when the filter coefficient c^1 of the second correcting filter 105b determines, it will only affect the part of the first control signal X1 impact, and can be expressed as:
c^1＝C11+F1*C01(4)
Therefore, in systems in which, the corrected value of the first correcting filter 105a is C00+F0*C10, wherein C00 is the transmission characteristics of fan place loudspeaker 103 to fan place MIC microphone 101, F0 is the coefficient of the first compensating filter 109a, and C10 is the transmission characteristics of Noise measarement field speaker 104 to fan place MIC microphone 101.In addition, the corrected value of the second correcting filter 105b is C11+F1*C01, wherein C11 is the transmission characteristics of Noise measarement field speaker 104 to Noise measarement region MIC microphone 102, F1 is the coefficient of the second compensating filter 109b, and C01 is the transmission characteristics of fan place loudspeaker 103 to Noise measarement region MIC microphone 102.
In systems in which, MIC microphone 101 is placed in one, fan place evaluation point as the first error pick-up, loudspeaker 103 sends the noise that signal eliminates this point, and loudspeaker 104 sends the impact of secondary sound source at Noise measarement region place that secondary sound source elimination fan place sends; MIC microphone 102 is placed in Noise measarement region o'clock as the second error pick-up, and loudspeaker 104 sends the noise that signal eliminates this shop, loudspeaker 103 sends secondary sound source that secondary sound source stress release treatment control area sends to the impact at fan place simultaneously.
In order to realize noise reduction in this way, filter coefficient F0, F1 of compensating filter 109a, 109b need meet:
C01＝-C11*F0(5)
C10＝-C00*F1(6)
By the first compensating filter 109a as above, the second compensating filter 109b, equation (1), (3) can be transformed to:
Y0+Y1＝(C00+F0*C10)*X0＝c^0*X0(7)
Y3+Y4＝(C11+F1*C01)*X1＝c^1*X1(8)
As shown in equation (7), (8), signal (Y0+Y1) inputs the first sef-adapting filter 108a correcting device 111a from MIC microphone 101a, and only by the impact of the first control signal X0; Signal (Y3+Y4) inputs the second sef-adapting filter 108b correcting device 111b from MIC microphone 101b, and only by the impact of the second control signal X1.Therefore, by designing above-mentioned first compensating filter 109a, the second compensating filter 109b, when the reduction of fan place noise, the noise in Noise measarement region also can reduce, and vice versa.
As mentioned above, the filter coefficient F0 of the first compensating filter 109a is determined by transmission characteristics C01 and C11 weighting; Meanwhile, the filter coefficient F1 of the second compensating filter 109b is determined by transmission characteristics C10 and C00 weighting.
Meanwhile, the filter coefficient W0 of the first sef-adapting filter 108a is upgraded by the first adaptive filter coefficient updating device 111a iteration, and is the residual signals that the first reference signal of sending based on the first correcting filter 105a and MIC microphone 101 record.In like manner, the filter coefficient W1 of the second sef-adapting filter 108b is upgraded by the second adaptive filter coefficient updating device 111b iteration, and is the residual signals that the second reference signal of sending based on the second correcting filter 105b and MIC microphone 102 record.The embodiment of the present invention can upgrade filter coefficient W0, W1 based on the LMS algorithm of saddle point method.Suppose that the first reference signal that the first correcting filter 105a exports is r0, the second reference signal that second correcting filter 105b exports is r1, the residual signals that MIC microphone 101 records is e0, and the residual signals that MIC microphone 102 records is e1, and makes the step-length of LMS algorithm be μ.So the recursive algorithm of filter coefficient W0 (n+1), W1 (n+1) can be expressed as:
W0(n+1)＝W0(n)-μ*e0(n)*r0(n)(9)
W1(n+1)＝W1(n)-μ*e1(n)*r1(n)(10)
By this method, filter coefficient W0, W1 can obtain optimum value by recursive convergent, make residual signals e0, e1 reach Minimal Realization self adaptive control, and that is the noise at MIC microphone 101,102 place reduces.As mentioned above, active noise controlling reduces noise, and the impact that can not change by the corresponding transmission characteristics between loudspeaker 103,104 to MIC microphone 101,102.Meanwhile, the not only noise reduction at fan place, the also reduction at Noise measarement region place.
Be understandable that, for the person of ordinary skill of the art, other various corresponding change and distortion can be made by technical conceive according to the present invention, and all these change the protection domain that all should belong to the claims in the present invention with distortion.
Claims (6)
1. an axial fan active noise control device, it is characterized in that, it comprises first time sound source generators, second time sound source generators, speed probe (110), the first error pick-up, the second error pick-up, controller (106);
Sound source generators, second time sound source generators, speed probe (110), the first error pick-up, the second error pick-up are all electrically connected with controller (106) for the first time;
The electronic pulse signal of rotation speed of the fan for synchronously obtaining the electronic pulse signal of rotation speed of the fan, and is sent to controller (106) by speed probe (110);
First error pick-up is positioned at the noise figure of fan first evaluation point for obtaining, and the noise figure of the first evaluation point is sent to controller (106);
Second error pick-up is positioned at the noise figure of fan second evaluation point for obtaining, and the noise figure of the second evaluation point is sent to controller (106);
First control signal, for generating the first control signal, the second control signal according to the electronic pulse signal of the rotating speed received, is sent to first time sound source generators by controller (106), the second control signal is sent to second time sound source generators; And for generating the first compensating signal according to the first control signal, the first compensating signal is sent to second subprime sound source generators, generate the second compensating signal according to the second control signal, the second compensating signal is sent to first time sound source generators;
First time, sound source generators was for offsetting the noise figure of the first evaluation point according to the first control signal sounding, and compensated the secondary sound source of the second evaluation point place second subprime sound source generators generation to the impact of the first error pick-up according to the second compensating signal;
Second time sound source generators is used for the noise figure of offsetting the first evaluation point according to the second control signal sounding, and compensates the secondary sound source of first the level sound source generators generation in the first evaluation point place to the impact of the second error pick-up according to the first compensating signal.
2. axial fan active noise control device as claimed in claim 1, it is characterized in that, controller (106) comprises the first reference generator (107a), second reference generator (107b), first sef-adapting filter (108a), second sef-adapting filter (108b), first compensating filter (109a), second compensating filter (109b), first correcting filter (105a), second correcting filter (105b), first adaptive filter coefficient updating device (111a), second adaptive filter coefficient updating device (111b),
First sef-adapting filter (108a) one end is electrically connected with the first reference generator (107a), the first correcting filter (105a) one end; First sef-adapting filter (108a) the other end is electrically connected with first time sound source generators; First correcting filter (105a) the other end is electrically connected with the first adaptive filter coefficient updating device (111a), the first error pick-up successively;
Second sef-adapting filter (108b) one end is electrically connected with the second reference generator (107b), the second correcting filter (105b) one end; Second sef-adapting filter (108b) the other end is electrically connected with second time sound source generators; Second correcting filter (105b) the other end is electrically connected with the second adaptive filter coefficient updating device (111b), the second error pick-up successively;
First compensating filter (109a) one end be connected electrically in the second sef-adapting filter (108b) and second time sound source generators between, the first compensating filter (109a) the other end be connected electrically in the first sef-adapting filter (108a) and first time sound source generators between;
Second compensating filter (109b) one end be connected electrically in the second sef-adapting filter (108b) and second time sound source generators between, the second compensating filter (109b) the other end be connected electrically in the first sef-adapting filter (108a) and first time sound source generators between.
3. axial fan active noise control device as claimed in claim 2, is characterized in that, described first time sound source generators be a pair loudspeaker, loudspeaker is arranged on fan both sides.
4. axial fan active noise control device as claimed in claim 2, it is characterized in that, described second time sound source generators is a pair loudspeaker, and loudspeaker is arranged on both sides, Noise measarement region.
5. axial fan active noise control device as claimed in claim 2, it is characterized in that, the first error pick-up is a MIC microphone, and MIC microphone is arranged on above fan.
6. axial fan active noise control device as claimed in claim 2, it is characterized in that, the second error pick-up is a MIC microphone, and MIC microphone is arranged on Noise measarement overlying regions.
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| CN107168179A (en) * | 2017-06-22 | 2017-09-15 | 武汉电器科学研究所 | A kind of noise fest checking sound-source signal generator based on FPGA |
| CN107165846A (en) * | 2016-03-07 | 2017-09-15 | 深圳市轻生活科技有限公司 | A kind of Voice command intelligent fan |
| CN107725487A (en) * | 2017-11-27 | 2018-02-23 | 山东超越数控电子股份有限公司 | A kind of denoising device for fan |
| CN108597491A (en) * | 2018-06-22 | 2018-09-28 | 常州倍速智能科技有限公司 | A kind of plumbing installation of achievable fan noise active control |
| CN108591129A (en) * | 2018-04-02 | 2018-09-28 | 郑州云海信息技术有限公司 | A kind of adaptive server active noise reduction system and noise-reduction method |
| CN114046273A (en) * | 2021-11-26 | 2022-02-15 | 西安科技大学 | Noise control method for local ventilator of coal mine |
| TWI779863B (en) * | 2021-10-06 | 2022-10-01 | 宏碁股份有限公司 | Electronic system with heat dissipation and feedforward active noise control function |
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