CN110322868A - A kind of driving frequency-conversion Helmholz resonance device and its frequency modulation noise-reduction method - Google Patents
A kind of driving frequency-conversion Helmholz resonance device and its frequency modulation noise-reduction method Download PDFInfo
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- CN110322868A CN110322868A CN201910492306.6A CN201910492306A CN110322868A CN 110322868 A CN110322868 A CN 110322868A CN 201910492306 A CN201910492306 A CN 201910492306A CN 110322868 A CN110322868 A CN 110322868A
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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
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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Abstract
The invention discloses a kind of driving frequency-conversion Helmholz resonance devices, including resonant cavity, connection short tube, aperture valve, driving frequency-conversion control system, flange assembly, one end of the connection short tube is connected to pipeline, the other end is connected to the resonant cavity, the aperture valve is coaxially connected at the middle part of the connection short tube and the connection short tube by the flange assembly, the input terminal of the driving frequency-conversion control system connect with the tube wall of the pipeline and is connected to its inside, and the output end of the driving frequency-conversion control system is connect with the aperture valve.The invention also discloses its frequency modulation methods.The invention has the advantages that: the sampling by driving frequency-conversion control system to noise signal in pipeline, and change the internal cross-sectional area of aperture valve by the valve opening degree that driving frequency-conversion system controls aperture valve, change the intrinsic frequency of resonant cavity, actively make resonant cavity intrinsic frequency consistent or close with the main frequency of noise, reach best noise elimination purpose, suitable for the noise reduction under various working.
Description
Technical field
The present invention relates to a kind of Helmholz resonance device, more particularly, to a kind of driving frequency-conversion Helmholz resonance device and its
Frequency modulation noise-reduction method.
Background technique
Helmholz resonance device is common denoiser in a kind of engineering, and principle is reached by Helmholtz sympathetic response effect
To the effect of the noise control under specific frequency, it relies on the features such as structure is simple, design is easy to process to be widely used in very
In multi-pipeline noise elimination problem.However, there is following deficiencies for traditional Helmholz resonance device: volume is bigger, many similar
The small spaces such as radiator fan outlet are difficult to install；Working frequency is single, poor for broadband noise effect, may also need more
A resonant cavity, this meeting is so that the volume of entire resonator is bigger, it is difficult to meet the noise reduction demand of current duct noise.
Application No. is 201610555355.6 patents to disclose a kind of film acoustical material and traditional Helmholz resonance
Device, which combines, forms a kind of new resonator.This improved resonator overcomes traditional Helmholz resonance device working frequency
Single problem provides a kind of new departure for solving the problems, such as duct noise.But belong to one by changing film acoustical material
Kind passive type control method, and control accuracy is not high, so that resonator is difficult to need with noise complete resonance, noise reduction effect
It improves.
Summary of the invention
Goal of the invention: in view of the above-mentioned problems, the object of the present invention is to provide a kind of driving frequency-conversion Helmholz resonance device and
Its frequency modulation noise-reduction method overcomes the problems, such as that duct noise noise reduction is difficult in the prior art, resonant frequency is single, improves sound-deadening and noise-reducing
Effect, and keep resonant frequency variable.
Technical solution: a kind of driving frequency-conversion Helmholz resonance device, including resonant cavity, connection short tube, aperture valve, actively change
One end of frequency control system, flange assembly, the connection short tube is connected to pipeline, and the other end is connected to the resonant cavity, described
Aperture valve by the flange assembly it is described connection short tube middle part and the connection short tube it is coaxially connected, the driving frequency-conversion
The input terminal of control system connect with the tube wall of the pipeline and is connected to its inside, the output of the driving frequency-conversion control system
End is connect with the aperture valve.
Driving frequency-conversion control system samples the noise acoustic signal in pipeline, and by a series of signal
Reason, the valve opening of output control signal control aperture valve, thus change the internal cross-sectional area of aperture valve, the intrinsic frequency of resonant cavity
Rate is identical or close as the main frequency of noise, resonates, to realize the purpose for eliminating noise.This Helmholz resonance device
It can be realized the active control of resonant frequency, to expand the frequency range of sound-deadening and noise-reducing, improve sound-deadening and noise-reducing effect, so that suitable
It is more extensive with property.
Further, the driving frequency-conversion control system includes the choacoustic frequency signal detector, letter of successively signal connection
Number amplifier, A/D converter, signal processor, controllor for step-by-step motor, step motion control motor, the choacoustic frequency signal inspection
The input terminal that device is the driving frequency-conversion control system is surveyed, the choacoustic frequency signal detector is vertically arranged in the pipeline
The output shaft of tube wall and fixation, the step motion control motor is connect with the aperture valve.
The noise acoustic signal in pipeline is sampled by choacoustic frequency signal detector, it will by signal amplifier
Acoustic signal amplification, then amplified acoustic signal will be acquired by A/D converter and be converted into the identifiable electricity of signal processor
Signal analyzes electric signal by signal processor, and signal processor issues control signal to controllor for step-by-step motor, step
Into the output shaft rotation of electric machine controller control step motion control motor, by the forward and reverse rotation of step motion control motor, to aperture
Valve valve opening is controlled, the accurate valve opening for controlling aperture valve, to change the internal cross-sectional area of aperture valve, resonant cavity
Intrinsic frequency it is identical or close as the main frequency of noise, resonate, thus realize eliminate noise purpose.Signal processing
Device is analyzed to obtain noise frequency substantial scope, if stream signal noise frequency changes, recalculates to obtain new correspondence noise frequency
The valve opening of the aperture valve of rate；If upstream noise frequency is constant, then the valve opening of current corresponding aperture valve is maintained.
Optimal, driving frequency-conversion control system further includes rubber seal, the choacoustic frequency signal detector with it is described
The rubber seal is equipped between the joint face of pipe wall.
Optimal, the choacoustic frequency signal detector is mounted on the noise transmission direction centered on the resonant cavity
Upstream.
Further, output gear is installed on the output shaft of the step motion control motor, the output gear with it is described
The valve control gear engagement of aperture valve.By the positive and negative rotation and gear drive of step motion control motor, aperture valve is accurately controlled
Valve opening, thus pass through aperture valve regulation frequency.
Further, the connection short tube includes the first short tube, the second short tube, one end and the pipe of first short tube
Road is connected to and fixes, and the other end is coaxially connected by the Single port of flange assembly and the aperture valve, and the one of second short tube
End is connected to and fixes with the resonant cavity, and the other end is coaxially connected by the another port of flange assembly and the aperture valve.It will
Connection short tube is designed as the first short tube, second short tube two parts, can facilitate and aperture valve is coaxially mounted in connection short tube
Portion.
Further, the flange assembly includes first flange disk, second flange disk, third ring flange, the 4th ring flange,
First flange disk both ends are tightly connected with the tube wall of second flange disk one end, the pipeline respectively, second method
The blue disk other end is connect with the Single port co-axial seal of the aperture valve, the 4th ring flange both ends respectively with the third method
Blue disk one end, the resonant cavity are tightly connected, and the another port of the third ring flange other end and the aperture valve is coaxially close
Envelope connection.
Optimal, first stub length is equal with second stub length.
Optimal, first minor tube inner diameter is equal with second minor tube inner diameter.
A method of using above-mentioned driving frequency-conversion Helmholz resonance device frequency modulation noise reduction, comprising the following steps:
Step 1: choacoustic frequency signal detector samples the noise signal propagated in the duct；
Step 2: sampled signal is passed to signal amplifier, signal amplifiers to sample for choacoustic frequency signal detector
Signal amplifies, and amplified signal is passed to A/D converter；
Step 3: amplified acoustic signal is converted into the identifiable electric signal of signal processor and passed by A/D converter
Pass signal processor；
Step 4: signal processor analyzes electric signal, obtain noise main frequency distribution concentration zones, then in advance
Precalculated result compares, and finds the valve opening of the aperture valve of corresponding best frequency of noise elimination, and will treated signal
Pass to controllor for step-by-step motor；
Step 5: controllor for step-by-step motor controls step motion control motor, and the output shaft gear of step motion control motor passes through tooth
Wheel transmission controls aperture valve valve control gear, actively adjusts aperture valve in real time by the positive and negative rotation of step motion control motor
Valve opening, valve opening size, that is, sectional area size of aperture valve is adjusted to suitable size, so that resonant cavity is intrinsic
Frequency is consistent or close with noise frequency, and specific aim completes the noise elimination noise reduction under real-time noise frequency.
The frequency formula of Helmholz resonance chamber are as follows:By formula it is found that when resonant cavity volume V with connect it is short
When the L of pipe range is remained unchanged, by change aperture valve valve blade opening degree to change the first short tube and the second short tube
Junction aperture valve internal cross-sectional area S, adjust the frequency F of resonant cavity.
The utility model has the advantages that compared with prior art, the invention has the advantages that by driving frequency-conversion control system to making an uproar in pipeline
The sampling of acoustical signal, is analyzed, and changes aperture valve by the valve opening degree that driving frequency-conversion system controls aperture valve
Internal cross-sectional area, thus change the intrinsic frequency of resonant cavity, the intrinsic frequency for making resonant cavity of active and the main frequency of noise
It is consistent or close, to achieve the purpose that most preferably to eliminate the noise.The present invention has broken the inherent limitations of the single resonant frequency of traditional resonator,
To reach suitable for the specific aim noise noise reduction purpose under a variety of different operating conditions.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the partial enlarged view of choacoustic frequency signal detector installation site；
Fig. 3 is the partial enlarged view of aperture valve installation site；
Fig. 4 is the structural schematic diagram of aperture valve；
Fig. 5 is the transmitting loss contrast curve chart that aperture valve fully opened and opened half in the embodiment of the present disclosure.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate
The present invention rather than limit the scope of the invention.
A kind of driving frequency-conversion Helmholz resonance device, as shown in figures 1-4, including resonant cavity 12, connection short tube, aperture valve
4, driving frequency-conversion control system, flange assembly, wherein connection short tube includes the first short tube 2, the second short tube 3, driving frequency-conversion control
System includes choacoustic frequency signal detector 5, signal amplifier 6, A/D converter 7, signal processor 8, controllor for step-by-step motor
9, step motion control motor 10, rubber seal 11, flange assembly include first flange disk 13, second flange disk 14, third flange
Disk 15, the 4th ring flange 16, aperture valve 4 include valve control gear 17, valve blade 18 and valve body 19.
One end of first short tube 2 is fixed with 1 outer wall of pipeline by welded seal, and is connected to the inside of pipeline 1, and first is short
2 other end of pipe and 13 one end of first flange disk are tightly connected, and the both ends of second flange disk 14 are another with first flange disk 13 respectively
The Single port co-axial seal connection at end, aperture valve 4, the another port of aperture valve 4 and 15 one end co-axial seal of third ring flange connect
It connects, the both ends of the 4th ring flange 16 are tightly connected with 15 other end of third ring flange, the second short tube 3 respectively, resonant cavity 12 and the
Two short tubes, 3 other end is tightly connected.The equal length of the length of first short tube 2 and the second short tube 3, and the internal diameter of the two also phase
Deng the first short tube 2, first flange disk 13, second flange disk 14, aperture valve 4, third ring flange 15, the 4th ring flange 16, second
Short tube 3, resonant cavity 12, which are sequentially connected, constitutes a channel.
Choacoustic frequency signal detector 5, signal amplifier 6, A/D converter 7, signal processor 8, controllor for step-by-step motor
9, successively signal connects step motion control motor 10, and choacoustic frequency signal detector 5 is the input terminal of active frequency-changing control system, sound
Tube wall and fixation that frequency signal detector 5 is vertically arranged in pipeline 1 are learned, is connected inside choacoustic frequency signal detector 5 and pipeline 1
It is logical, rubber seal 11, the inspection of choacoustic frequency signal are equipped between the joint face of 1 tube wall of choacoustic frequency signal detector 5 and pipeline
The upstream that device 5 is mounted on the noise transmission direction centered on resonant cavity 12 is surveyed, the output shaft of step motion control motor 10 is actively
The output end of frequency-changing control system is equipped with output gear, output gear and aperture valve 4 on the output shaft of step motion control motor 10
Valve control gear 17 engage, the outer ring of valve blade 18 is equipped with driven gear, and valve control gear 17 is nibbled with driven gear
It closes, 18 opening degree of control valve blade.
The frequency formula of Helmholz resonance chamber are as follows:By formula it is found that when 12 volume V of resonant cavity with connect
When the long L of short tube is remained unchanged, by change aperture valve 4 valve blade 18 opening degree to change the first short tube 2 and the
The 4 internal cross-sectional area S of aperture valve of the junction of two short tubes 3 adjusts the frequency F of resonant cavity 12.
The method for carrying out frequency modulation noise reduction using above-mentioned driving frequency-conversion Helmholz resonance device, is calculated using emulation mode
Aperture valve 4 opens different degrees of transmitting loss.Wherein pipeline 1 is bounds round tube, and a diameter of 0.05m, length is
1.20m, when this resonator is installed in its side, and aperture valve 4 is opened, internal diameter is 0.0808m, length 0.04m, resonant cavity
12 be cylindrical bounds cavity, diameter 0.15m, height 0.24m.Specific steps are as follows:
Step 1: when noise is propagated in the duct, noise signal is adopted by choacoustic frequency signal detector 5 first
Sample；
Step 2: sampled signal is passed to signal amplifiers 6 for choacoustic frequency signal detector 5, the letter after over-sampling
Number sampled signal is amplified by signal amplifier 6；
Step 3: amplified acoustic signal is converted into signal processor using A/D converter 7 by amplified signal
8 identifiable electric signals；
Step 4: signal processor 8 analyzes electric signal, obtain noise main frequency distribution concentration zones, then with
The result precalculated compares, and finds the valve opening of the aperture valve 4 of corresponding best frequency of noise elimination；
Step 5: the frequency formula of Helmholz resonance chamber are as follows:By formula it is found that working as 12 body of resonant cavity
It is short to change the first short tube 2 and second by the opening degree for changing aperture valve 4 when L product V long with short tube is connect is remained unchanged
The 4 internal cross-sectional area S of aperture valve of the junction of pipe 3 adjusts the frequency F of resonant cavity 12；
Step 6: controllor for step-by-step motor 9 controls step motion control motor 10, the output shaft gear pair of step motion control motor 10
4 valve of aperture valve control gear 17 is controlled, and actively adjusts the valve opening of aperture valve 4 in real time.When step motion control motor
When 10 rotating forward, the valve opening of aperture valve 4 increases；When step motion control motor 10 inverts, the valve opening of aperture valve 4 reduces.
Valve opening size, that is, sectional area size of aperture valve 4 is adjusted to suitable size, so that the intrinsic frequency and noise of resonant cavity 12
Frequency is consistent or close, to achieve the purpose that the specific aim noise elimination noise reduction of different noise frequencies.
As shown in figure 5, solid line indicates that valve fully opens, connecting minor tube inner diameter at this time is 0.0808m, and resonant frequency exists
90Hz, and mark line is indicated when aperture valve 4 opens half, connection minor tube inner diameter is 0.0404m, and resonant frequency becomes 75Hz.
Therefore, it is apparent that acoustic attenuation performance of the novel driving frequency-conversion Helmholz resonance device under different noise frequency operating conditions
Performance is good.
Claims (10)
1. a kind of driving frequency-conversion Helmholz resonance device, it is characterised in that: including resonant cavity, connection short tube, aperture valve, actively change
One end of frequency control system, flange assembly, the connection short tube is connected to pipeline, and the other end is connected to the resonant cavity, described
Aperture valve by the flange assembly it is described connection short tube middle part and the connection short tube it is coaxially connected, the driving frequency-conversion
The input terminal of control system connect with the tube wall of the pipeline and is connected to its inside, the output of the driving frequency-conversion control system
End is connect with the aperture valve.
2. a kind of driving frequency-conversion Helmholz resonance device according to claim 1, it is characterised in that: the driving frequency-conversion control
System processed includes choacoustic frequency signal detector, the signal amplifier, A/D converter, signal processor, step of successively signal connection
Into electric machine controller, step motion control motor, the choacoustic frequency signal detector is the input of the driving frequency-conversion control system
End, the choacoustic frequency signal detector are vertically arranged in tube wall and the fixation of the pipeline, the step motion control motor it is defeated
Shaft is connect with the aperture valve.
3. a kind of driving frequency-conversion Helmholz resonance device according to claim 2, it is characterised in that: further include rubber seal
Circle is equipped with the rubber seal between the choacoustic frequency signal detector and the joint face of the pipe wall.
4. a kind of driving frequency-conversion Helmholz resonance device according to claim 2, it is characterised in that: the choacoustic frequency letter
Number detector is mounted on the upstream in the noise transmission direction centered on the resonant cavity.
5. a kind of driving frequency-conversion Helmholz resonance device according to claim 2, it is characterised in that: the step motion control electricity
Output gear is installed, the output gear is engaged with the valve of aperture valve control gear on the output shaft of machine.
6. a kind of driving frequency-conversion Helmholz resonance device according to claim 1, it is characterised in that: the connection short tube packet
The first short tube, the second short tube are included, one end of first short tube is connected to and fixes with the pipeline, and the other end passes through flange assembly
Coaxially connected with the Single port of the aperture valve, one end of second short tube is connected to and fixes with the resonant cavity, the other end
Another port by flange assembly and the aperture valve is coaxially connected.
7. a kind of driving frequency-conversion Helmholz resonance device according to claim 6, it is characterised in that: the flange assembly packet
Include first flange disk, second flange disk, third ring flange, the 4th ring flange, first flange disk both ends are respectively with described
The tube wall sealed connection of two ring flange one end, the pipeline, the Single port of the second flange disk other end and the aperture valve
Co-axial seal connection, the 4th ring flange both ends are tightly connected with third ring flange one end, the resonant cavity respectively, institute
The third ring flange other end is stated to connect with the another port co-axial seal of the aperture valve.
8. a kind of driving frequency-conversion Helmholz resonance device according to claim 6, it is characterised in that: first short tube is long
It spends equal with second stub length.
9. a kind of driving frequency-conversion Helmholz resonance device according to claim 6, it is characterised in that: in first short tube
Diameter is equal with second minor tube inner diameter.
10. a kind of method using any driving frequency-conversion Helmholz resonance device frequency modulation noise reduction of claim 2~5,
Be characterized in that the following steps are included:
Step 1: choacoustic frequency signal detector samples the noise signal propagated in the duct；
Step 2: choacoustic frequency signal detector is sampled signal is passed to signal amplifier, and signal amplifier is by sampled signal
It amplifies, and amplified signal is passed into A/D converter；
Step 3: amplified acoustic signal is converted into the identifiable electric signal of signal processor and passed to by A/D converter
Signal processor；
Step 4: signal processor analyzes electric signal, obtains the main frequency distribution concentration zones of noise, then counts with preparatory
The result of calculation compares, and finds the valve opening of the aperture valve of corresponding best frequency of noise elimination, and signal transmits by treated
To controllor for step-by-step motor；
Step 5: controllor for step-by-step motor controls step motion control motor, and the output shaft gear of step motion control motor is passed by gear
It is dynamic that aperture valve valve control gear is controlled, actively adjust the valve of aperture valve in real time by the positive and negative rotation of step motion control motor
Door aperture, valve opening size, that is, sectional area size of aperture valve is adjusted to suitable size, so that the intrinsic frequency of resonant cavity
Consistent or close with noise frequency, specific aim completes the noise elimination noise reduction under real-time noise frequency.
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Cited By (7)
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| CN110751938A (en) * | 2019-10-12 | 2020-02-04 | 江苏科技大学 | Helmholtz resonator and working method thereof |
| CN111981236A (en) * | 2020-07-14 | 2020-11-24 | 江苏科技大学 | Silencing device for actively modulating frequency and changing stop band and silencing method thereof |
| CN112664744A (en) * | 2020-12-15 | 2021-04-16 | 江苏科技大学 | Helmholtz resonator with adjustable extension neck and adjusting method thereof |
| CN112687255A (en) * | 2020-12-23 | 2021-04-20 | 江苏科技大学 | Parallel Helmholtz resonator capable of being automatically switched and working method thereof |
| CN112967708A (en) * | 2021-02-01 | 2021-06-15 | 江苏科技大学 | Cavity-movable Helmholtz resonator and control method thereof |
| CN115142999A (en) * | 2022-08-02 | 2022-10-04 | 哈尔滨工程大学 | Booster air inlet silencer with adjustable cavity space structure |
| CN116045414A (en) * | 2022-12-15 | 2023-05-02 | 南京林业大学 | Continuous frequency-adjustable ventilation sound insulation structure based on Fano resonance and frequency modulation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110751938A (en) * | 2019-10-12 | 2020-02-04 | 江苏科技大学 | Helmholtz resonator and working method thereof |
| CN111981236A (en) * | 2020-07-14 | 2020-11-24 | 江苏科技大学 | Silencing device for actively modulating frequency and changing stop band and silencing method thereof |
| CN112664744A (en) * | 2020-12-15 | 2021-04-16 | 江苏科技大学 | Helmholtz resonator with adjustable extension neck and adjusting method thereof |
| CN112687255A (en) * | 2020-12-23 | 2021-04-20 | 江苏科技大学 | Parallel Helmholtz resonator capable of being automatically switched and working method thereof |
| CN112967708A (en) * | 2021-02-01 | 2021-06-15 | 江苏科技大学 | Cavity-movable Helmholtz resonator and control method thereof |
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| US11905916B1 (en) * | 2022-08-02 | 2024-02-20 | Harbin Engineering University | Turbocharger air intake silencer with adjustable cavity space structure |
| CN116045414A (en) * | 2022-12-15 | 2023-05-02 | 南京林业大学 | Continuous frequency-adjustable ventilation sound insulation structure based on Fano resonance and frequency modulation method |
| CN116045414B (en) * | 2022-12-15 | 2023-06-20 | 南京林业大学 | Continuous frequency-adjustable ventilation sound insulation structure based on Fano resonance and frequency modulation method |
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Application publication date: 20191011 |