CN105427854A - Coal face active noise suppression control system - Google Patents
Coal face active noise suppression control system Download PDFInfo
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- CN105427854A CN105427854A CN201510934409.5A CN201510934409A CN105427854A CN 105427854 A CN105427854 A CN 105427854A CN 201510934409 A CN201510934409 A CN 201510934409A CN 105427854 A CN105427854 A CN 105427854A
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- 230000001629 suppression Effects 0.000 title claims abstract description 27
- 239000003245 coal Substances 0.000 title abstract description 16
- 238000012545 processing Methods 0.000 claims abstract description 27
- 244000309464 bull Species 0.000 claims description 14
- 230000002265 prevention Effects 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 description 18
- 230000009467 reduction Effects 0.000 description 13
- 230000008569 process Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 4
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- 238000013461 design Methods 0.000 description 3
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- 230000008676 import Effects 0.000 description 3
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- 238000005065 mining Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000006185 dispersion Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Abstract
The invention discloses a coal face active noise suppression control system, which comprises an intake airway noise collection and secondary noise source output device, a working face noise collection and secondary noise source output device, a return airway noise collection and secondary noise source output device and a main controller, wherein the signal output end of the intake airway noise collection and secondary noise source output device, the signal output end of the working face noise collection and secondary noise source output device and the signal output end of the return airway noise collection and secondary noise source output device are connected to the main controller. The control system disclosed by the invention, by respectively distributing the noise collection and secondary noise source output devices on various noise source parts, can input the various noise sources subjected to classified collection into the main controller; a central processing unit, according to the characteristics of different signals, can generate various secondary noise source digital signals and then transmit the various secondary noise source digital signals to the various noise sources, and a secondary noise source generator can generate a secondary sound wave, which is the same with the noise source in frequency and amplitude and opposite to the noise source in phase, so as to offset the noise; therefore, the purpose of reducing the noise is finally achieved.
Description
Technical field
The present invention relates to noise in coal mine and administer field, particularly a kind of coal-face initiatively noise suppression control system.
Background technology
Noise is the serious public hazards polluting mine environment, is also one of key factor of harm mine safety production.In the coal-face region of underground coal mine, coalcutter on the haul winch of intake and mine car, main workplace and the fortune coal transmission belt etc. in return aircourse all create very large noise, these noises have that intensity is large, sound level high, add coal mine operation narrow space, close, make sound wave be difficult to dispersion.So more have a strong impact on the physical and mental health of coal miner, also can make that underground labour is slow in reacting, work incentive decline, not easily observation accident omen, ignored or be difficult to receive and transmit the various disaster signal in down-hole, add the possibility had an accident.Therefore the Research of Noise Reduction of coal-face is had a very big significance.
Noise reduction and be mainly divided into two large technology categories according to the difference of disposal route except the technology of making an uproar, i.e. passive noise control technique (also claiming passive noise elimination technique) and active noise control technique (also claiming Active Noise Control technology).Traditional passive noise control mainly adopts sound absorption, sound insulation, uses the acoustic methods such as sound suppressor to carry out noise reduction.This mode centering, high frequency noise (more than 500Hz) are more effective, and it is undesirable to the noise reduction of low-frequency noise (below 500Hz), because in mine, noise mainly concentrates on low-frequency range, this control technology is not obviously suitable for underground coal mine noise reduction, in addition, the coalcutter, mine car, scraper conveyer, fortune coal belt etc. of the underground work main plant equipment producing noise is all motion when working, and passive noise isolation cannot be adopted to control.Active noise control technique then based on sound wave interference principle, by noise control system produce one with noise frequency, amplitude is identical, phase place is contrary secondary sound wave, this sound wave and noise source sound wave are offseted at space overlapping, reach certain noise reduction.Compared with traditional passive noise control technique, active noise control technique is more suitable for the Noise measarement process of coal-face, more economically, conveniently, and reaches better noise reduction.
At present, there are some patents of invention for underground coal mine initiatively noise suppression control system, disclosed the method for underground coal mine application active control technology reduction noise.Such as, Chinese invention patent CN101930731B discloses a kind of mining multi-wave self-adaptive active noise control system, have employed many ripples, improves the design of the aspect such as speed of convergence, flameproof enclosure of controller and propose certain solution to eliminating the noise pollution of mine.But, at present how active noise suppression control system is arranged to reach better noise reduction in coal work mask body and is also in relative white space.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides that a kind of structure is simple, cost is low, the coal-face of excellent noise reduction effect, long service life initiatively noise suppression control system.
The technical scheme that the present invention solves the problem is: a kind of coal-face is noise suppression control system initiatively, comprise air intake lane Noise Acquisition and secondary sound source output unit, workplace Noise Acquisition and secondary sound source output unit, return airway Noise Acquisition and secondary sound source output unit, master controller, described air intake lane Noise Acquisition and secondary sound source output unit are arranged in air intake lane, workplace Noise Acquisition and secondary sound source output unit are arranged on coalcutter, return airway Noise Acquisition and secondary sound source output unit are arranged on the lane wall of return airway, air intake lane Noise Acquisition and secondary sound source output unit, workplace Noise Acquisition and secondary sound source output unit, the signal output part of return airway Noise Acquisition and secondary sound source output unit is all connected with master controller, master controller respectively with air intake lane Noise Acquisition and secondary sound source output unit, workplace Noise Acquisition and secondary sound source output unit, return airway Noise Acquisition and secondary sound source output unit are connected.
In above-mentioned coal-face active noise suppression control system, described air intake lane Noise Acquisition and secondary sound source output unit comprise the first Noise Acquisition device, the first A/D converter, first level noise generator and the first D/A converter, the signal output part of described first Noise Acquisition device is connected with the input end of the first A/D converter, the output terminal of the first A/D converter is connected with master controller, master controller is connected with the input end of the first D/A converter, and the output terminal of the first D/A converter is connected with first level noise generator.
In above-mentioned coal-face active noise suppression control system, described workplace Noise Acquisition and secondary sound source output unit comprise the second Noise Acquisition device, second A/D converter, second subprime noise generator, second D/A converter and upper and lower swingle, described second Noise Acquisition device is arranged on coalcutter, the signal output part of the second Noise Acquisition device is connected with the input end of the second A/D converter, the output terminal of the second A/D converter is connected with master controller, master controller is connected with the input end of the second D/A converter, the output terminal of the second D/A converter is connected with second subprime noise generator, described second subprime noise generator is connected on coalcutter by upper and lower swingle.
In above-mentioned coal-face active noise suppression control system, the top of described second Noise Acquisition device and second subprime noise generator is provided with loss prevention guard shield.
In above-mentioned coal-face active noise suppression control system, described return airway Noise Acquisition and secondary sound source output unit comprise the 3rd Noise Acquisition device, 3rd A/D converter, level noise generator for the third time, 3rd D/A converter and left-right rotary bull stick, the signal output part of described 3rd Noise Acquisition device is connected with the input end of the 3rd A/D converter, the output terminal of the 3rd A/D converter is connected with master controller, master controller is connected with the input end of the 3rd D/A converter, the output terminal of the 3rd D/A converter is connected with third time level noise generator, described third time, level noise generator was connected on the wall of lane by left-right rotary bull stick, left-right rotary bull stick is connected with master controller.
In above-mentioned coal-face active noise suppression control system, the front of described 3rd Noise Acquisition device and for the third time level noise generator is provided with the first spray means for dedusting.
In above-mentioned coal-face active noise suppression control system, the quantity of described return airway Noise Acquisition and secondary sound source output unit is multiple, and multiple air way Noise Acquisition and secondary sound source output unit are evenly laid on the lane wall of return airway.
In above-mentioned coal-face active noise suppression control system, described master controller comprises the central processing unit being placed in air intake lane, central processing unit has three input ends and three output terminals, three input ends of central processing unit input air intake lane Noise Acquisition digital signal, workplace Noise Acquisition digital signal, return airway Noise Acquisition digital signal respectively, and three output terminals of central processing unit export air intake lane secondary noise digital signal, workplace secondary noise digital signal, return airway secondary noise digital signal respectively.
In above-mentioned coal-face active noise suppression control system, described master controller also comprises pedestrian's positioning inductor, and pedestrian's positioning inductor is connected with central processing unit, and central processing unit is connected with left-right rotary bull stick.
In above-mentioned coal-face active noise suppression control system, all A/D converters are arranged in Noise Acquisition device place corresponding thereto, and all D/A converters are arranged in secondary sound source generator place corresponding thereto.
Beneficial effect of the present invention is:
1, the present invention is directed to air intake lane, coal-face, the Main Noise Sources of return airway, Noise Acquisition and secondary sound source output unit is arranged respectively at different noise source place, different noise sources is carried out classification acquisition process, the voice signal collected at different noise source place is input to the central processing unit of master controller after A/D converter converts digital signal to, central processing unit produces different secondary sound source digital signals according to the feature of unlike signal, again secondary sound source digital signal is sent to each noise source place, by D/A converter, digital signal is converted to voice signal again, sent and noise source same frequency by secondary sound source generator, same amplitude, the secondary sound wave of antiphase comes to offset with noise, finally reach noise reduction object.
2, in workplace Noise Acquisition of the present invention and secondary sound source output unit, upper and lower swingle is adopted to be connected with coalcutter by second subprime noise generator, the operation that rotatable second subprime noise generator can switch back and forth according to coalcutter up-down roller, in real time secondary noise is outputted to upper cylinder and the bottom roll place of coalcutter, the acquisition capacity of noise would not be affected like this because of the movement of coalcutter and reduce the effect that secondary noise offsets noise, and the design of a secondary noise generator also facilitates more economically, decreases usage space.
3, the present invention installs loss prevention guard shield additional on the second subprime noise generator and the second Noise Acquisition device of workplace Noise Acquisition and secondary sound source output unit, can prevent the coal cinder cut from falling down the device damaging and be contained on coalcutter, its dust-proof spraying system effect had by coal mining machine roller itself, extends device serviceable life.
4, in return airway Noise Acquisition of the present invention and secondary sound source output unit, third time level noise generator use left-right rotary bull stick connects lane wall, can the return airway pedestrian path timely adjustment anglec of rotation that senses of the secondary noise generator of the left rotation and right rotation air way pedestrian positioning inductor that can return according to master controller, to be transferred in return aircourse around pedestrian with making secondary noise maximum magnitude, improve noise reduction, reduce and use secondary noise generator.
5, the three Noise Acquisition device of the present invention in return airway Noise Acquisition and secondary sound source output unit and third time level noise generator front aerosolater is housed, the accumulation of dust on device can be reduced, extension fixture serviceable life.
6, the quantity of return airway Noise Acquisition of the present invention and secondary sound source output unit is multiple, multiple air way Noise Acquisition and secondary sound source output unit are evenly laid on the lane wall of return airway, improve noise reduction, and the layout quantity of return airway Noise Acquisition and secondary sound source output unit can be drawn according to actual conditions to the wavelength of noise source, frequency after carrying out analytical calculation, reduce unnecessary device waste.
7, master controller of the present invention is placed on the less intake place of dust, decrease the interference of dust, improve work efficiency, extend term of life, master controller adopts the design of multi input, multi output, classification process is carried out to multi-signal, the defect easily obscured when effectively overcoming same parametric controller process multi-signal.
Accompanying drawing explanation
Fig. 1 is one-piece construction block diagram of the present invention.
Fig. 2 is the circuit diagram of air intake lane Noise Acquisition and secondary sound source output unit in Fig. 1.
Fig. 3 is the circuit diagram of workplace Noise Acquisition and secondary sound source output unit in Fig. 1.
Fig. 4 is the circuit diagram of return airway Noise Acquisition and secondary sound source output unit in Fig. 1.
Fig. 5 is the structured flowchart of master controller in Fig. 1.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in Figure 1, the present invention includes air intake lane Noise Acquisition and secondary sound source output unit 1, workplace Noise Acquisition and secondary sound source output unit 2, return airway Noise Acquisition and secondary sound source output unit 3, master controller 5, described air intake lane Noise Acquisition and secondary sound source output unit 1 are arranged on 11 li, air intake lane, workplace Noise Acquisition and secondary sound source output unit 2 are arranged on the coalcutter 8 of coal-face 12, return airway Noise Acquisition and secondary sound source output unit 3 are arranged on the lane wall of return airway 13, air intake lane Noise Acquisition and secondary sound source output unit 1, workplace Noise Acquisition and secondary sound source output unit 2, the signal output part of return airway Noise Acquisition and secondary sound source output unit 3 is all connected with master controller 5, master controller 5 respectively with air intake lane Noise Acquisition and secondary sound source output unit 1, workplace Noise Acquisition and secondary sound source output unit 2, return airway Noise Acquisition and secondary sound source output unit 3 are connected.
As shown in Figure 2, described air intake lane Noise Acquisition and secondary sound source output unit 1 comprise the first Noise Acquisition device 25, first A/D converter 26, first level noise generator 27 and the first D/A converter 28, the signal output part of described first Noise Acquisition device 25 is connected with the input end of the first A/D converter 26, the output terminal of the first A/D converter 26 is connected with master controller 5, master controller 5 is connected with the input end of the first D/A converter 28, and the output terminal of the first D/A converter 28 is connected with first level noise generator 27.
As shown in Figure 3, described workplace Noise Acquisition and secondary sound source output unit 2 comprise the second Noise Acquisition device 10, second A/D converter 30, second subprime noise generator 11, second D/A converter 14 and upper and lower swingle 12, described second Noise Acquisition device 10 is arranged on coalcutter 8, the signal output part of the second Noise Acquisition device 10 is connected with the input end of the second A/D converter 30, the output terminal of the second A/D converter 30 is connected with master controller 5, master controller 5 is connected with the input end of the second D/A converter 14, the output terminal of the second D/A converter 14 is connected with second subprime noise generator 11, described second subprime noise generator 11 is connected on coalcutter 8 by upper and lower swingle 12, the top of described second Noise Acquisition device 10 and second subprime noise generator 11 is provided with loss prevention guard shield 13.
The quantity of described return airway Noise Acquisition and secondary sound source output unit 3 is 2, and 2 return airway Noise Acquisitions and secondary sound source output unit are evenly laid on the lane wall of return airway 13.As shown in Figure 4, each return airway Noise Acquisition and secondary sound source output unit 3 include the 3rd Noise Acquisition device 17, 3rd A/D converter 18, level noise generator 19 for the third time, 3rd D/A converter 20 and left-right rotary bull stick 29, the signal output part of described 3rd Noise Acquisition device 17 is connected with the input end of the 3rd A/D converter 18, the output terminal of the 3rd A/D converter 18 is connected with master controller 5, master controller 5 is connected with the input end of the 3rd D/A converter 20, the output terminal of the 3rd D/A converter 20 19 to be connected with third time level noise generator, described third time, level noise generator 19 was connected on the wall of lane by left-right rotary bull stick 29, left-right rotary bull stick 29 is connected with master controller 5, the front of described 3rd Noise Acquisition device 17 and for the third time level noise generator 19 is provided with the first spray means for dedusting.
As shown in Figure 5, described master controller 5 comprises the central processing unit 32 and pedestrian's positioning inductor 38 that are placed in air intake lane 11, central processing unit 32 has three input ends (air intake lane Noise Acquisition digital signal input end 31, workplace Noise Acquisition digital signal input end 34, return airway Noise Acquisition digital signal input end 36) and three output terminal (air intake lane secondary noise digital signal output ends 33, workplace secondary noise digital signal output end 35, return airway secondary noise digital signal output end 37), three input ends 31 of central processing unit 32, 34, 36 input air intake lane Noise Acquisition digital signal respectively, workplace Noise Acquisition digital signal, return airway Noise Acquisition digital signal, three output terminals 33 of central processing unit 32, 35, 37 export air intake lane secondary noise digital signal respectively, workplace secondary noise digital signal, return airway secondary noise digital signal.Pedestrian's positioning inductor 38 is connected with central processing unit 32, and central processing unit 32 is connected with left-right rotary bull stick 29.
Because sound wave can be decayed in communication process, in order to produce secondary sound source more accurately, all A/D converters are arranged in Noise Acquisition device place corresponding thereto, all D/A converters are arranged in secondary sound source generator place corresponding thereto, transmit between main control platform and noise source with the form of digital signal, effectively reduce error.
Principle of work of the present invention is as follows:
Air intake lane 11 noise is eliminated: the noise of haul winch 6 and mine car 7 is identified by the first Noise Acquisition device 25 and gathers, first A/D converter 26 converts the voice signal from the first Noise Acquisition device 25 to digital signal, after digital signal is sent to master controller 5, central processing unit 32 is entered by air intake lane Noise Acquisition digital signal input end 31, after central processing unit 32 processes, produce corresponding secondary sound source digital signal, via air intake lane secondary noise digital signal output end 33 this secondary sound source digital data transmission got back in the first D/A converter 28 in air intake lane Noise Acquisition and secondary sound source output unit 1 again, change into and noise source same frequency through the first D/A converter 28 process, same amplitude, import into air from first level noise generator 27 after the voice signal of antiphase and offset with noise source.
Workplace 12 noise is eliminated: the upper cylinder 15 on coalcutter 8, the noise that bottom roll 16 cuts coal body identifies collection by the second Noise Acquisition device 10, second A/D converter 30 converts the voice signal from the second Noise Acquisition device 10 to digital signal, after digital signal is sent to master controller 5, central processing unit 32 is entered by workplace Noise Acquisition digital signal input end 34, after central processing unit 32 processes, produce corresponding secondary sound source digital signal, via workplace secondary noise digital signal output end 35 this secondary sound source digital data transmission got back in the second D/A converter 14 in workplace Noise Acquisition and secondary sound source output unit 2 again, change into and noise source same frequency through the second D/A converter 14 process, same amplitude, import into air from second subprime noise generator 11 after the voice signal of antiphase and offset with noise source, the operation that rotatable second subprime noise generator 11 can switch back and forth according to coalcutter 8 up-down roller, outputs to upper cylinder 15 and bottom roll 16 place of coalcutter 8 in real time by secondary noise.
Return airway 13 noise is eliminated: the noise of fortune coal belt 9 is identified by the 3rd Noise Acquisition device 17 and gathers, 3rd A/D converter 18 converts the voice signal from the 3rd Noise Acquisition device 17 to digital signal, after digital signal is sent to master controller 5, central processing unit 32 is entered by return airway Noise Acquisition digital signal input end 36, after central processing unit 32 processes, produce corresponding secondary sound source digital signal, via return airway secondary noise digital signal output end 37 this secondary sound source digital data transmission got back in the 3rd D/A converter 20 in return airway Noise Acquisition and secondary sound source output unit 3 again, change into and noise source same frequency through the 3rd D/A converter 20 process, same amplitude, import into air from third time level noise generator 19 after the voice signal of antiphase and offset with noise source.Meanwhile, return airway pedestrian positioning signal is sent in return airway Noise Acquisition and secondary sound source output unit 3 by the return airway pedestrian positioning inductor 38 on master controller 5, the anglec of rotation of level noise generator 19 is for the third time adjusted by left-right rotary bull stick 29, spray means for dedusting works simultaneously, prevents the dust of return airway 13 li from amassing and drops on return airway Noise Acquisition and secondary sound source output unit 3.
Claims (10)
1. a coal-face initiatively noise suppression control system, it is characterized in that: comprise air intake lane Noise Acquisition and secondary sound source output unit, workplace Noise Acquisition and secondary sound source output unit, return airway Noise Acquisition and secondary sound source output unit, master controller, described air intake lane Noise Acquisition and secondary sound source output unit are arranged in air intake lane, workplace Noise Acquisition and secondary sound source output unit are arranged on coalcutter, return airway Noise Acquisition and secondary sound source output unit are arranged on the lane wall of return airway, air intake lane Noise Acquisition and secondary sound source output unit, workplace Noise Acquisition and secondary sound source output unit, the signal output part of return airway Noise Acquisition and secondary sound source output unit is all connected with master controller, master controller respectively with air intake lane Noise Acquisition and secondary sound source output unit, workplace Noise Acquisition and secondary sound source output unit, return airway Noise Acquisition and secondary sound source output unit are connected.
2. coal-face according to claim 1 initiatively noise suppression control system, it is characterized in that: described air intake lane Noise Acquisition and secondary sound source output unit comprise the first Noise Acquisition device, the first A/D converter, first level noise generator and the first D/A converter, the signal output part of described first Noise Acquisition device is connected with the input end of the first A/D converter, the output terminal of the first A/D converter is connected with master controller, master controller is connected with the input end of the first D/A converter, and the output terminal of the first D/A converter is connected with first level noise generator.
3. coal-face according to claim 2 initiatively noise suppression control system, it is characterized in that: described workplace Noise Acquisition and secondary sound source output unit comprise the second Noise Acquisition device, second A/D converter, second subprime noise generator, second D/A converter and upper and lower swingle, described second Noise Acquisition device is arranged on coalcutter, the signal output part of the second Noise Acquisition device is connected with the input end of the second A/D converter, the output terminal of the second A/D converter is connected with master controller, master controller is connected with the input end of the second D/A converter, the output terminal of the second D/A converter is connected with second subprime noise generator, described second subprime noise generator is connected on coalcutter by upper and lower swingle.
4. coal-face according to claim 3 initiatively noise suppression control system, is characterized in that: the top of described second Noise Acquisition device and second subprime noise generator is provided with loss prevention guard shield.
5. coal-face according to claim 3 initiatively noise suppression control system, it is characterized in that: described return airway Noise Acquisition and secondary sound source output unit comprise the 3rd Noise Acquisition device, 3rd A/D converter, level noise generator for the third time, 3rd D/A converter and left-right rotary bull stick, the signal output part of described 3rd Noise Acquisition device is connected with the input end of the 3rd A/D converter, the output terminal of the 3rd A/D converter is connected with master controller, master controller is connected with the input end of the 3rd D/A converter, the output terminal of the 3rd D/A converter is connected with third time level noise generator, described third time, level noise generator was connected on the wall of lane by left-right rotary bull stick, left-right rotary bull stick is connected with master controller.
6. coal-face according to claim 5 initiatively noise suppression control system, is characterized in that: the front of described 3rd Noise Acquisition device and for the third time level noise generator is provided with the first spray means for dedusting.
7. coal-face according to claim 6 initiatively noise suppression control system, it is characterized in that: the quantity of described return airway Noise Acquisition and secondary sound source output unit is multiple, and multiple air way Noise Acquisition and secondary sound source output unit are evenly laid on the lane wall of return airway.
8. coal-face according to claim 5 initiatively noise suppression control system, it is characterized in that: described master controller comprises the central processing unit being placed in air intake lane, central processing unit has three input ends and three output terminals, three input ends of central processing unit input air intake lane Noise Acquisition digital signal, workplace Noise Acquisition digital signal, return airway Noise Acquisition digital signal respectively, and three output terminals of central processing unit export air intake lane secondary noise digital signal, workplace secondary noise digital signal, return airway secondary noise digital signal respectively.
9. coal-face according to claim 8 initiatively noise suppression control system, it is characterized in that: described master controller also comprises pedestrian's positioning inductor, pedestrian's positioning inductor is connected with central processing unit, and central processing unit is connected with left-right rotary bull stick.
10. coal-face according to claim 5 initiatively noise suppression control system, it is characterized in that: all A/D converters are arranged in Noise Acquisition device place corresponding thereto, all D/A converters are arranged in secondary sound source generator place corresponding thereto.
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| CN201510934409.5A CN105427854A (en) | 2015-12-15 | 2015-12-15 | Coal face active noise suppression control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107749295A (en) * | 2017-10-17 | 2018-03-02 | 张博强 | Wind power generating set Noise Active noise control method and active noise control system |
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| CN104217712A (en) * | 2014-09-19 | 2014-12-17 | 阿特拉斯科普柯(南京)建筑矿山设备有限公司 | Active noise reduction device of engineering machinery operation room and rock drilling machine |
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| CN107749295A (en) * | 2017-10-17 | 2018-03-02 | 张博强 | Wind power generating set Noise Active noise control method and active noise control system |
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