CN208268639U - A kind of passive noise reduction system of pipeline master based on flexible microperforated panel - Google Patents
A kind of passive noise reduction system of pipeline master based on flexible microperforated panel Download PDFInfo
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- CN208268639U CN208268639U CN201820501046.5U CN201820501046U CN208268639U CN 208268639 U CN208268639 U CN 208268639U CN 201820501046 U CN201820501046 U CN 201820501046U CN 208268639 U CN208268639 U CN 208268639U
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- noise
- acquisition unit
- microperforated panel
- ventilation shaft
- sound source
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Abstract
The passive noise reduction system of pipeline master based on flexible microperforated panel that the utility model discloses a kind of, including ventilation shaft, it further include being located at the primary sound source being arranged successively on ventilation shaft inner wall from arrival end to outlet extreme direction sequence, primary noise acquisition unit, flexible microperforated panel and outlet Noise Acquisition unit, one section tube wall of the ventilation shaft close to outlet end is replaced by flexible microperforated panel, flexible microperforated panel and the seamless airtight connection of ventilation shaft, arrival end of the primary sound source close to ventilation shaft, Noise Acquisition unit is exported close to the outlet end of ventilation shaft, the underface of the flexibility microperforated panel is closed to be fixed with secondary sound source, secondary noise acquisition unit is equipped between flexible microperforated panel and secondary sound source, secondary sound source is abutted against digital signal processor DSP, digital signal processor DSP is adopted with primary noise Collect unit, secondary noise acquisition unit and secondary sound source electrical connection.This system can reduce influence of the noise to pipe-line system.
Description
Technical field
The utility model relates to noise reduction technology, the passive noise reduction system of specifically a kind of pipeline master based on flexible microperforated panel
System.
Background technique
The wideband noise control of ventilation shaft is the key link of industrial system Low Noise Design, is prevented and treated ambient noise
With very important scientific meaning, the method for controlling pipeline noise reduction at present is unable to satisfy wanting for ventilation shaft broadband control
It asks, pipeline noise reduction technology includes two methods of passive noise reduction and active noise reduction at present.
The pipeline noise reduction technology overwhelming majority is all passive noise reduction mode at present, by the shape and use that optimize pipe surface
The modes such as new material reduce noise by resistive sound absorption, reactive muffling, however passive noise reduction mode can only be to a certain extent
Noise is reduced, since the low frequency part of noise is also to influence the comfortable one side of people in the environment, passive noise reduction mode is difficult to disappear
Except the influence of low-frequency noise；
Mainly there are feed forward noise reduction and feedback noise reduction in the active noise reduction techniques studied at present, feed forward noise reduction technology passes through
The reference signal in sensor acquisition noise source and the error signal of outlet end, controller are sent out further according to the signal that sensor acquires
The column sound opposite with noise characteristic carries out noise reduction out, achievees the effect that microperforated panel back acoustic pressure is 0；Feedback noise reduction technology
The noise signal of outlet end is only acquired by sensor, controller issues a column according to the signal that sensor acquires and noise is special
Property opposite sound carry out noise reduction, however feedback noise reduction only carries out noise reduction according to the noise signal of outlet end, has certain stagnant
Property afterwards.
Utility model content
The purpose of this utility model is in view of the deficiencies of the prior art, and to provide a kind of pipeline based on flexible microperforated panel
Main passive noise reduction system.This noise reduction system is avoided that the delay acquisition of acoustical signal, can handle in time noise signal,
Reduce influence of the noise to pipe-line system, which has better low frequency absorption compared to rigid material using flexible sound-absorbing material
Effect, the system excellent noise reduction effect.
Realizing the technical solution of the utility model aim is:
This noise reduction system, including ventilation shaft, one end of the ventilation shaft are the arrival end of pipe-line system, the other end
It further include unlike the prior art being located on ventilation shaft inner wall from arrival end to out for the outlet end of pipe-line system
Primary sound source, the primary noise that mouth extreme direction sequence is arranged successively acquire single, flexible microperforated panel and export Noise Acquisition unit,
Wherein, one section tube wall of the ventilation shaft close to outlet end is replaced by flexible microperforated panel, flexible microperforated panel and ventilation duct
Airtight connection that road is seamless, the primary sound source export Noise Acquisition unit close to ventilation duct close to the arrival end of ventilation shaft
The outlet end in road, the underface of the flexibility microperforated panel is closed to be fixed with secondary sound source, flexible microperforated panel and secondary sound source
Between be equipped with secondary noise acquisition unit, secondary sound source is abutted against digital signal processor DSP, digital signal processor DSP and just
Grade Noise Acquisition unit, secondary noise acquisition unit and secondary sound source electrical connection.
The digital signal processor DSP is using least-mean-square error algorithm, that is, LMS algorithm sef-adapting filter.
The primary noise acquisition unit, secondary noise acquisition unit and outlet Noise Acquisition unit are for acquiring sound
The microphone of signal, frequency response range 20Hz-20KHz.
Resistive sound-absorbing material is flexible microperforated panel in this noise reduction system, is vibrated using microperforated panel flexible to absorb
Pipeline low frequency range noise, flexible microperforated panel sound absorption have preferable inhibitory effect to senior middle school's band noise, and micro- using flexibility
The feature of perforated plate flexibility can make resonant frequency mobile to low frequency, be conducive to the noise reduction of part low frequency range noise, but it
Noise reduction frequency range is relatively narrow, and use scope has limitation, and Technique of Active Noise Control is disappeared using the destructive interference principle of sound wave
Except noise；It can be good at inhibiting low-band signal on a large scale, overcome the shortcomings of that structure absorbs sound, and sound absorption effect reaches
Within the scope of required noise reduction.
This noise reduction system combines the method and active-passive composite sound absorption machine of permanent slipstream pipeline interfacial pressure release
Reason, the principle of pressure method for releasing is the signal for acquiring secondary noise acquisition unit, is sent into digital signal processor DSP, warp
One section of signal for making flexible microperforated panel back acoustic pressure tend to 0 is issued after adaptive-filtering processing, reaches preferable medium-high frequency section
Sound absorption effect；Active-passive composite sound absorbing mechanism is to combine passive resistance sound absorption, resistive sound absorption with active adaptive-filtering
Principle can be realized the preferable sound absorption effect of low, middle and high frequency section noise in ventilation shaft.
This noise reduction system use LMS algorithm sef-adapting filter, can be effectively controlled duct noise allowed band with
It is interior, the influence of noise on human body can be reduced.
This ventilation shaft noise reduction system primary sound source ventilation shaft arrival end, ventilation shaft arrival end and go out
Mouthful end is respectively disposed with Noise Acquisition unit, outlet Noise Acquisition unit, can be released by obtaining this signal difference at two
The noise reduction effect of the system, while Noise Acquisition unit will also provide reference signal together with secondary noise acquisition unit for DSP
With error signal, the sef-adapting filter based on LMS algorithm is used inside DSP, passes through collected reference signal and error
Signal calculates iteration signal automatically and is transmitted to secondary sound source, so that the back acoustic pressure of flexible microperforated panel goes to zero, the system
The passive noise-reduction method of master embodied by seal chamber that flexible microperforated panel is formed with secondary sound source, by adjusting in DSP in real time
The coefficient of portion's sef-adapting filter reaches the real-time processing of noise signal, keeps the passive noise reduction system operation strategies of the master more extensive.
This noise reduction system is avoided that the delay acquisition of acoustical signal, can handle in time noise signal, and reduction is made an uproar
Influence of the sound to pipe-line system, the system have better effect of low-frequency sound absorption compared to rigid material using flexible sound-absorbing material,
The system excellent noise reduction effect.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of embodiment.
In figure, primary 3. 4. secondary sound source of flexible microperforated panel of sound source, 5. digital signal processor of 1. ventilation shaft 2.
DSP M1. primary noise acquisition unit M2. secondary noise acquisition unit M3. exports Noise Acquisition unit.
Specific embodiment
The content of the present invention is further elaborated with reference to the accompanying drawings and examples, but is not to the utility model
Restriction.
Embodiment:
Referring to Fig.1, a kind of passive noise reduction system of pipeline master based on flexible microperforated panel, including ventilation shaft 1, it is described logical
One end of air piping 1 is the arrival end of pipe-line system, and it further includes being located at ventilation shaft 1 that the other end, which is the outlet end of pipe-line system,
Primary sound source 2, primary noise acquisition list M1, the flexibility being arranged successively on inner wall from arrival end to outlet extreme direction sequence micro- are worn
Orifice plate 3 and outlet Noise Acquisition unit M3, wherein the ventilation shaft 1 close to outlet end one section of tube wall by flexible micropunch
Plate 3 is replaced, flexible microperforated panel 3 and the seamless airtight connection of ventilation shaft 1, primary sound source 2 the entering close to ventilation shaft 1
Mouth end, for outlet Noise Acquisition unit M3 close to the outlet end of ventilation shaft 1, the underface of the flexibility microperforated panel 3 is closed solid
Surely there is secondary sound source 4, secondary noise acquisition unit M2 is equipped between flexible microperforated panel 3 and secondary sound source 4, secondary sound source 4 leans on
Meet digital signal processor DSP 5, digital signal processor DSP 5 and primary noise acquisition unit M1, secondary noise acquisition unit
M2 and secondary sound source 4 are electrically connected.
The digital signal processor DSP 5 is using least-mean-square error algorithm, that is, LMS algorithm sef-adapting filter.
The primary noise acquisition unit M1, secondary noise acquisition unit M2 and outlet Noise Acquisition unit M3 are to be used for
Acquire the microphone of acoustical signal, frequency response range 20Hz-20KHz.
Resistive sound-absorbing material is flexible microperforated panel 3 in this noise reduction system, is vibrated using microperforated panel 3 flexible to inhale
Closed tube road low frequency range noise, the flexible sound absorption of microperforated panel 3 has preferable inhibitory effect to senior middle school's band noise, and utilizes flexibility
The flexible feature of microperforated panel 3 can make resonant frequency mobile to low frequency, be conducive to the noise reduction of part low frequency range noise, but it
Noise reduction frequency range it is relatively narrow, use scope have limitation, Technique of Active Noise Control using the destructive interference principle of sound wave come
Eliminate noise；It can be good at inhibiting low-band signal on a large scale, overcome the shortcomings of that structure absorbs sound, and reach required
Within the scope of noise reduction.
This noise reduction system combines permanent slipstream pipeline interface impedance Method of Optimal Matching and active-passive composite sound absorption
Mechanism.The principle of pressure method for releasing is the signal for acquiring secondary noise acquisition unit M2, is sent into DSP5, through adaptive-filtering
One section of signal for making flexible 3 back acoustic pressure of microperforated panel go to zero is issued after processing, reaches preferable medium-high frequency section sound absorption effect；
Active-passive composite sound absorbing mechanism is the principle for combining passive resistance sound absorption, resistive sound absorption with active adaptive-filtering, can
Realize the preferable sound absorption effect of low, middle and high frequency section noise in ventilation shaft 1.
This noise reduction system use LMS algorithm sef-adapting filter, can be effectively controlled duct noise allowed band with
It is interior, the influence of noise on human body can be reduced.
This ventilation shaft noise reduction system primary sound source 2 ventilation shaft 1 arrival end, in the arrival end of ventilation shaft 1
It is respectively disposed with primary noise acquisition unit M1, outlet Noise Acquisition unit M3 with outlet end, by obtaining this signal at two
Difference can release the noise reduction effect of the system, while Noise Acquisition unit M1 will also be together with secondary noise acquisition unit M2
DSP5 provides reference signal and error signal, the sef-adapting filter based on LMS algorithm is used inside DSP5, by collecting
Reference signal and error signal, calculate iteration signal automatically and be transmitted to secondary sound source 4, so that after flexible microperforated panel 3
Back acoustic pressure goes to zero, and the seal chamber that the passive noise-reduction method of the master of the system is made of flexible microperforated panel 3 with secondary sound source 4 is come body
It is existing, by adjusting the coefficient of sef-adapting filter inside DSP5 in real time, reaches the real-time processing of noise signal, drop the master passively
System of making an uproar operation strategies are more extensive.
5 chip of digital signal processor DSP selects TMS320F28335 in this example, and the inside of TMS320F28335 chip is adopted
With the separated Harvard structure of program and data, there is special hardware multiplier, pile line operation is widely used, passes through multichannel
Buffered serial port is stored data into a manner of data frame on piece buffer area, is interrupted when receiving CPU, and the data of buffer area are moved
The real-time processing of data is realized to processing buffer area in position, can be used to quickly realize various digital signal processing algorithms, especially
It is suitble to the processing of the voice signal of the active noise reduction system of the utility model to calculate.
Claims (3)
1. a kind of passive noise reduction system of pipeline master based on flexible microperforated panel, including ventilation shaft, the one of the ventilation shaft
End is the arrival end of pipe-line system, and the other end is the outlet end of pipe-line system, characterized in that further includes being located at ventilation shaft inner wall
Primary sound source from arrival end to outlet extreme direction sequence that be arranged successively on face from, primary noise acquisition unit, flexible microperforated panel
With outlet Noise Acquisition unit, wherein one section tube wall of the ventilation shaft close to outlet end is replaced by flexible microperforated panel, soft
Property the microperforated panel and seamless airtight connection of ventilation shaft, the primary sound source exports noise close to the arrival end of ventilation shaft
For acquisition unit close to the outlet end of ventilation shaft, the underface of the flexibility microperforated panel is closed to be fixed with secondary sound source, flexibility
Secondary noise acquisition unit is equipped between microperforated panel and secondary sound source, secondary sound source is abutted against digital signal processor DSP, number
Signal processor DSP is electrically connected with primary noise acquisition unit, secondary noise acquisition unit and secondary sound source.
2. the pipeline master passive noise reduction system according to claim 1 based on flexible microperforated panel, characterized in that the number
Word signal processor DSP is using least-mean-square error algorithm, that is, LMS algorithm sef-adapting filter.
3. the pipeline master passive noise reduction system according to claim 1 based on flexible microperforated panel, characterized in that described first
Grade Noise Acquisition unit, secondary noise acquisition unit and outlet Noise Acquisition unit are the microphone for acquiring acoustical signal,
Frequency response range is 20Hz-20KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820501046.5U CN208268639U (en) | 2018-04-10 | 2018-04-10 | A kind of passive noise reduction system of pipeline master based on flexible microperforated panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820501046.5U CN208268639U (en) | 2018-04-10 | 2018-04-10 | A kind of passive noise reduction system of pipeline master based on flexible microperforated panel |
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| CN208268639U true CN208268639U (en) | 2018-12-21 |
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| CN201820501046.5U Expired - Fee Related CN208268639U (en) | 2018-04-10 | 2018-04-10 | A kind of passive noise reduction system of pipeline master based on flexible microperforated panel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110823615A (en) * | 2019-10-16 | 2020-02-21 | 中国人民解放军92578部队 | Performance test evaluation system for active and passive composite muffler of ventilation pipeline |
| CN110838282A (en) * | 2019-11-21 | 2020-02-25 | 珠海格力电器股份有限公司 | Composite sound absorption device and method for drying air duct of washing machine and washing machine |
-
2018
- 2018-04-10 CN CN201820501046.5U patent/CN208268639U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110823615A (en) * | 2019-10-16 | 2020-02-21 | 中国人民解放军92578部队 | Performance test evaluation system for active and passive composite muffler of ventilation pipeline |
| CN110838282A (en) * | 2019-11-21 | 2020-02-25 | 珠海格力电器股份有限公司 | Composite sound absorption device and method for drying air duct of washing machine and washing machine |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181221 Termination date: 20190410 |
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| CF01 | Termination of patent right due to non-payment of annual fee |