CN1651726A - Adaptive active control silencer - Google Patents
Adaptive active control silencer Download PDFInfo
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- CN1651726A CN1651726A CN 200510023946 CN200510023946A CN1651726A CN 1651726 A CN1651726 A CN 1651726A CN 200510023946 CN200510023946 CN 200510023946 CN 200510023946 A CN200510023946 A CN 200510023946A CN 1651726 A CN1651726 A CN 1651726A
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- phasitron
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Exhaust Silencers (AREA)
Abstract
The present invention provides an adaptive actively-controlled noise blanker. It includes coaxially-arranged internal pipe and external pipe, between the internal pipe and external pipe they are connected by means of a spiral baffle plate, it also includes reference microphone, error microphone, two preamplifier, digital signal processing chip, servo motor controller and servo motor, motor driving magnesium and phasitron. Said invention can effectively eliminate noise in the 100-250 Hz frequency range, and its noise reduction can be up to 25 dB.
Description
Technical field
The present invention relates to a kind of electric transmissio mechanism, particularly a kind of adaptive active control silencer.
Background technique
Similar noise such as internal combustion engine exhaust noise has transfers that feature is obvious, dominant frequency is low, noise level is big, the operating conditions variability is big, reduces this noise like and is significant to protecting environment.
This noise like all is to adopt the passive type silencing apparatus to control traditionally, utilizes the interaction sound energy consumption of sound wave and acoustical material or acoustic construction to reach the purpose of noise elimination.The shortcoming of passive type silencing apparatus is bulky, Heavy Weight, relatively poor to low-frequency noise control effect, and can't adjust working state.
The eighties in last century, the U.S., Japan and other countries begin to utilize the sound wave interference type silencing apparatus of sound wave interference principle research energy practice.Sound wave interference type silencing apparatus utilizes the sound wave interference phenomenon that two row amplitudes are identical, frequency equates, phase place is opposite to eliminate the noise, and to there being the noise of accent sound deadening capacity big, low frequency is eliminated the noise effective.But such silencing apparatus all can't transfer the variation of noise characteristic frequency regulate the feature frequency of noise elimination of silencing apparatus at having, thereby makes that sound deadening capacity obviously descends under most of operating mode, does not reach the due noise elimination effect of interference type silencing apparatus.
Existing sound wave interference type silencing apparatus can be divided into two big classes:
1, passive passive type is interfered silencing apparatus.Such silencing apparatus such as U.S. Pat 3948349, Japan Patent spy open clear 60-222516 etc., all be pipe and the outer tube in the flow that wait that adopts coaxial arrangement, fixing helical baffle is set to increase the transmission distance of outer tube sound wave between inner and outer pipes, thereby form phase difference with the sound wave in interior pipe, form to interfere at downstream part and eliminate the noise.To before and after the nineties, the expert has developed a kind of on-site manual preconditioning interference frequencies device for this type silencing apparatus both at home and abroad, and forms as related invention patents such as Chinese patent CN86104117A.The major defect of this class silencing apparatus is:
A is the same with conventional muffler, belongs to open loop control, and the silencing apparatus control system is easily dispersed, and causes silencing apparatus frequency of noise elimination and actual noise frequency inconsistent, and sound deadening capacity declines to a great extent;
B, can only be before joining machine carry out silencing apparatus particular job interference frequencies and regulate and be provided with according to local noise, behind the equipment operation, such silencing apparatus can not change the running parameter of adjusting silencing apparatus with equipment running status, medium physical parameter, can not the real-time tracking noise frequency, thus development influences sound deadening capacity even can amplify noise.
2, active active interference silencing apparatus, i.e. active silencer.This class silencing apparatus adopts active ACTIVE CONTROL mode, and the noise source signal is analyzed, and utilizes secondary sound source initiatively to send sound wave with noise source signal inversion position then, forms to interfere and eliminates the noise.Active ACTIVE CONTROL (ANC) notion just proposed as far back as the thirties in 20th century, but the research of this class silencing apparatus is just risen after the eighties, digital circuit was found broad application gradually.At present, the Active Noise Control theory emerges in an endless stream, but the active silencer product of domestic external enwergy input practice seldom.Tracing it to its cause, is that active silencer also exists following technological difficulties:
A, active ACTIVE CONTROL system control model more complicated become elementary noise, complex three-dimensional spatial sound field model and multichannel secondary sound source system etc. when relating to;
B, active control theory and algorithm are still immature, and the transfer function poor robustness often causes system to be dispersed, and frequency of noise elimination departs from the noise characteristic frequency, thereby have a strong impact on the noise elimination effect.
Summary of the invention
Purpose of the present invention, be in order to solve under the variable working condition existing interference type silencing apparatus because of interference frequencies and actually have the noise frequency of accent to misfit the problem that causes sound deadening capacity to decline to a great extent, to provide a kind of and need not secondary sound source, can the alterable features frequency of transferring noise be arranged and reach best adaptive active control silencer of interfering the noise elimination effect from motion tracking.
Purpose of the present invention realizes by following technological scheme: a kind of adaptive active control silencer, the outer tube and the interior pipe that comprise coaxial setting, link to each other by helical baffle between the inner and outer pipes, also comprise with reference to microphone, error microphone, two preamplifiers, digital signal processing chip, servomotor controller, actuating motor, motor transmission mechanism and phasitron; Wherein be arranged in the pipe of silencing apparatus entry end with reference to microphone, error microphone is arranged in the pipe of silencing apparatus outlet end, two preamplifiers, digital signal processing chip, servomotor controller and actuating motor are arranged on outside the pipe, the input end of two preamplifiers respectively with the reference microphone, error microphone links to each other, output terminal connects the input end of digital signal processing chip respectively, the output terminal of digital signal processing chip connects the input end of servomotor controller, the output terminal of servomotor controller connects actuating motor, actuating motor links to each other with the motor transmission mechanism transmission, motor transmission mechanism is arranged on the outlet end of silencing apparatus and links to each other with the phasitron transmission, can move forward and backward along interior pipe in the outlet end of pipe in phasitron is arranged on.
Described motor transmission mechanism comprises main shaft, driving bevel gear, transmission umbrella gear and drive lead screw, one end of main shaft links to each other with motor, the tube wall that the other end pierces into outer tube and outer tube downside is movably connected, driving bevel gear is arranged on the middle part of main shaft, the end that the transmission umbrella gear is arranged on drive lead screw links to each other with the driving bevel gear engagement driving, and drive lead screw is set in the phasitron and links to each other with the transmission of phasitron thread engagement.
Described phasitron is a hollow tube, and its two ends respectively are provided with a strut, and the center of two struts respectively is provided with a tapped hole, and described drive lead screw rotation set links to each other with the transmission of phasitron screw thread in two tapped holes of two struts.
Adaptive active control silencer of the present invention makes it compared with prior art owing to adopted above technological scheme, has outstanding advantage:
1, the no secondary sound source self adaption ACTIVE CONTROL mode that original creation proposes for the interference type silencing apparatus, adopt the feedforward closed loop control, strong robustness, good stability, both avoid passive passive type interference type silencing apparatus owing to Interference system is easily dispersed the serious situation about descending of the sound deadening capacity that causes, and avoided the active silencer control system too complicated and at present can't desirable situation about realizing again;
2, adaptive active control silencer of the present invention has been integrated the technology in a plurality of fields such as acoustics, signal measurement and automatic control, and whole process realizes intelligent real-time tracking frequency modulation technology, is applicable to the variable working condition condition.Automatically calculate, carry out and adjust the silencing apparatus Operational Limits according to the noise signal of gathering in real time in running, adjust the interference frequencies of silencing apparatus at any time, reach the best noise elimination state to characteristic frequency, whole process need not to operate manually intervention.
Adaptive active control silencer of the present invention can be to there being the noise of accent to implement effectively to eliminate the noise in 100～250Hz frequency range (most of power equipment work fundamental frequency), and its noise reduction reaches 25dB, and drag losses is little, does not influence the power of power equipment substantially.
Description of drawings
Fig. 1 is the structural principle schematic representation of adaptive active control silencer of the present invention;
Fig. 2 is the structural representation of the interior pipe among the present invention;
Fig. 3 is the structural representation of the phasitron among the present invention.
Embodiment
Referring to Fig. 1, adaptive active control silencer of the present invention comprises outer tube 1, interior pipe 2, helical baffle 3, with reference to microphone 4, error microphone 5, two preamplifiers 6,7, digital signal processing chip 8, servomotor controller 9, actuating motor 10, motor transmission mechanism 11 and phasitron 12.Outer tube 1 and the 2 coaxial settings of interior pipe link to each other by helical baffle 3 between outer tube 1 and the interior pipe 2.The entrance point of outer tube 1 is connected with suction flange 101, and outlet end is connected with outlet(discharge) flange 102.Cooperation evenly is provided with a plurality of perforation 21 referring to Fig. 2 on the tube wall of interior pipe 2 outlet end, the ratio that each perforated table area sum accounts for region tube wall total surface area is greater than 40%, and the interior length of tube that is provided with perforation is the 30-50% of interior pipe length overall.Be arranged on reference to microphone 4 in the pipe of silencing apparatus entry end, link to each other with the preamplifier 6 of outside by the shielding wire that passes outer tube wall.Error microphone 5 is arranged in the pipe of silencing apparatus outlet end, links to each other with the preamplifier 7 of outside by the shielding wire that passes outer tube wall.Two preamplifiers 6,7, digital signal processing chip 8, servomotor controller 9 and actuating motor 10 are arranged on outside the pipe, and are placed on cylindrical shell central authorities outside with the form of Set Top Box.The input end of preamplifier 6 links to each other with reference microphone 4, output terminal connects an input end of digital signal processing chip 8, the input end of preamplifier 7 links to each other with error microphone 5, output terminal connects another input end of digital signal processing chip 8, the output terminal of digital signal processing chip 8 connects the input end of servomotor controller 9, the output terminal of servomotor controller 9 connects actuating motor 10, actuating motor 10 links to each other with motor transmission mechanism 11 transmissions, and motor transmission mechanism 11 is arranged on the outlet end of silencing apparatus and links to each other with phasitron 12 transmissions.Cooperation is referring to Fig. 3, and phasitron 12 is a hollow tube, and in the outlet end of pipe 2, the center that its two ends respectively are provided with a strut 121, two struts 121 respectively is provided with a tapped hole 122 in being arranged on.
Continuation is referring to Fig. 1, and motor transmission mechanism 11 is arranged on the outlet end of silencing apparatus, comprises main shaft 111, driving bevel gear 112, transmission umbrella gear 113 and drive lead screw 114.One end of main shaft 111 links to each other with actuating motor 10, and the tube wall that the other end pierces into outer tube and outer tube downside is movably connected.Driving bevel gear 112 is arranged on the middle part of main shaft 111, the end that transmission umbrella gear 113 is arranged on drive lead screw 114 links to each other with driving bevel gear 112 transmissions, and drive lead screw 114 rotation sets link to each other with the transmission of phasitron screw thread in two tapped holes 122 of two struts 121 of phasitron 12.
The working principle of adaptive active control silencer of the present invention is, after height has the noise of accent air-flow to enter silencing apparatus from flange mouth 101, is divided into two-way and enters interior pipe 2 and outer tube 1 respectively, links to each other with helical baffle 3 between inner and outer pipes.Automatically gather the reference noise signal that enters silencing apparatus with reference to microphone 4, be input to digital signal processing chip 8 by preamplifier 6 then and carry out signal spectral analysis and the calculating of eigen frequency interference wavelength; Error microphone 5 automatic the collections through the error noise signal after the interference noise elimination of silencing apparatus outlet end, and feed-in digital signal processing chip 8 are as the adjusting parameter formation feedforward closed loop control of transfer function.Sef-adapting filter in the digital signal processing chip 8 is according to the transfer function of adaptive algorithm adjusting itself, again according to reference signal and error signal output control signal, drive actuating motor 10, thereby regulate the flexible state of phasitron 12, make that the wave length of sound progressive error is 1/2 eigen frequency wavelength in the inner and outer pipes, be that phase difference is 180 °, two sound waves just in time phase place are interfered noise elimination on the contrary, make silencing apparatus be in best noise elimination state all the time.
Adaptive active control silencer of the present invention is applied to a Britain PERKINS1006TAG diesel engine and carries out exhaust sound control.Joining machine is 300mm with the adaptive active control silencer latus rectum, long 16800mm, and size is little, and is in light weight.Make diesel engine work under different power and corresponding rotating speed operating mode, its exhaust has the characteristics of noise of accent frequency to move in the 100-250HZ frequency range.Test result shows, this silencing apparatus can be with there being its eigen frequency of variation real-time tracking of transferring noise, and compares at the eigen frequency place that sound deadening capacity reaches 28～30dB under the light pipe situation.
Claims (3)
1, a kind of adaptive active control silencer, the outer tube and the interior pipe that comprise coaxial setting, link to each other by helical baffle between the inner and outer pipes, it is characterized in that: also comprise with reference to microphone, error microphone, two preamplifiers, digital signal processing chip, servomotor controller, actuating motor, motor transmission mechanism and phasitron; Wherein be arranged in the pipe of silencing apparatus entry end with reference to microphone, error microphone is arranged in the pipe of silencing apparatus outlet end, two preamplifiers, digital signal processing chip, servomotor controller and actuating motor are arranged on outside the pipe, the input end of two preamplifiers respectively with the reference microphone, error microphone links to each other, output terminal connects the input end of digital signal processing chip respectively, the output terminal of digital signal processing chip connects the input end of servomotor controller, the output terminal of servomotor controller connects actuating motor, actuating motor links to each other with the motor transmission mechanism transmission, motor transmission mechanism is arranged on the outlet end of silencing apparatus and links to each other with the phasitron transmission, can move forward and backward along interior pipe in the outlet end of pipe in phasitron is arranged on.
2, adaptive active control silencer as claimed in claim 1, it is characterized in that: described motor transmission mechanism comprises main shaft, driving bevel gear, transmission umbrella gear and drive lead screw, one end of main shaft links to each other with motor, the tube wall that the other end pierces into outer tube and outer tube downside is movably connected, driving bevel gear is arranged on the middle part of main shaft, the end that the transmission umbrella gear is arranged on drive lead screw links to each other with the driving bevel gear engagement driving, and drive lead screw is set in the phasitron and links to each other with the transmission of phasitron thread engagement.
3, adaptive active control silencer as claimed in claim 1 or 2, it is characterized in that: described phasitron is a hollow tube, its two ends respectively are provided with a strut, the center of two struts respectively is provided with a tapped hole, and described drive lead screw rotation set links to each other with the transmission of phasitron screw thread in two tapped holes of two struts.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510023946 CN1651726A (en) | 2005-02-18 | 2005-02-18 | Adaptive active control silencer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510023946 CN1651726A (en) | 2005-02-18 | 2005-02-18 | Adaptive active control silencer |
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| CN1651726A true CN1651726A (en) | 2005-08-10 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102477883A (en) * | 2010-11-25 | 2012-05-30 | 中原工学院 | Driving silencer |
| CN104063610A (en) * | 2014-07-01 | 2014-09-24 | 中冶南方工程技术有限公司 | Simulation noise source and original noise sensor transmitting model identifying method |
| CN104632792A (en) * | 2014-12-12 | 2015-05-20 | 燕山大学 | Pipe type variable-damping filter provided with multiple holes with different parameters and applied to opening of hydraulic pump |
| CN105139861A (en) * | 2015-08-24 | 2015-12-09 | 昆明科林科技工程有限公司 | Method and device for active noise reduction for industrial noise treatment |
| CN110318845A (en) * | 2018-03-30 | 2019-10-11 | 现代自动车株式会社 | Silencer and its control method with removable baffle plate |
| CN110630352A (en) * | 2019-11-21 | 2019-12-31 | 潍柴动力股份有限公司 | Silencer and engine with same |
| CN111210801A (en) * | 2020-02-25 | 2020-05-29 | 北京绿创声学工程股份有限公司 | Tonal noise compensation elimination method and system |
-
2005
- 2005-02-18 CN CN 200510023946 patent/CN1651726A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102477883A (en) * | 2010-11-25 | 2012-05-30 | 中原工学院 | Driving silencer |
| CN104063610A (en) * | 2014-07-01 | 2014-09-24 | 中冶南方工程技术有限公司 | Simulation noise source and original noise sensor transmitting model identifying method |
| CN104632792A (en) * | 2014-12-12 | 2015-05-20 | 燕山大学 | Pipe type variable-damping filter provided with multiple holes with different parameters and applied to opening of hydraulic pump |
| CN105139861A (en) * | 2015-08-24 | 2015-12-09 | 昆明科林科技工程有限公司 | Method and device for active noise reduction for industrial noise treatment |
| CN105139861B (en) * | 2015-08-24 | 2018-08-17 | 昆明科林科技工程有限公司 | A kind of reduction method and device administered for man-made noise |
| CN110318845A (en) * | 2018-03-30 | 2019-10-11 | 现代自动车株式会社 | Silencer and its control method with removable baffle plate |
| CN110630352A (en) * | 2019-11-21 | 2019-12-31 | 潍柴动力股份有限公司 | Silencer and engine with same |
| CN111210801A (en) * | 2020-02-25 | 2020-05-29 | 北京绿创声学工程股份有限公司 | Tonal noise compensation elimination method and system |
| CN111210801B (en) * | 2020-02-25 | 2022-08-02 | 北京绿创声学工程股份有限公司 | Tonal noise compensation elimination method and system |
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