CN204516347U - Based on the acoustic impedance regulating device of self-adaptation micro-perforated plate sound absorber - Google Patents
Based on the acoustic impedance regulating device of self-adaptation micro-perforated plate sound absorber Download PDFInfo
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- CN204516347U CN204516347U CN201520150481.4U CN201520150481U CN204516347U CN 204516347 U CN204516347 U CN 204516347U CN 201520150481 U CN201520150481 U CN 201520150481U CN 204516347 U CN204516347 U CN 204516347U
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Abstract
The utility model relates to a kind of acoustic impedance regulating device based on self-adaptation micro-perforated plate sound absorber, and this acoustic impedance regulating device comprises noise detector, adaptive controller, piezoelectric membrane driving circuit and piezoelectric membrane porous plate acoustic adsorption device.Noise detector, probe placement is in noise circumstance, and its output terminal is connected with the input end of adaptive controller; Adaptive controller, its output terminal is connected with the input end of piezoelectric membrane driving circuit; Piezoelectric membrane driving circuit, its output terminal is connected with the outer electrode of piezoelectric membrane porous plate acoustic adsorption device; Piezoelectric membrane porous plate acoustic adsorption device is piezoelectric membrane microperforated panel and the sound absorption structure covering thereafter back of the body chamber formation.The utility model utilizes the inverse piezoelectric effect of piezoelectric membrane to adjust piezoelectric membrane microperforated panel surface vibration velocity in real time, the acoustical absorption coefficient of microperforated panel resonance sound-absorbing structure can be optimized, significantly expand effective sound sucting band of microperforated panel resonance sound-absorbing structure, realize noise reduction as required.
Description
Technical field
The utility model relates to micro-perforated plate sound absorber technical field, is specifically related to a kind of acoustic impedance regulating device based on self-adaptation micro-perforated plate sound absorber.
Background technology
Society, science and technology develops rapidly, and social pace of progress is accelerated, but thing followed radiated noise brings a large amount of harm also to the various aspects of people's productive life.Research and control noises be protection of the environment in the urgent need to, be also improve industrial product quality, the reduction energy consumption problem that must solve.
Noise measarement mainly contains three kinds of measures, and one is control noises source; Two is the routes of transmission at control noises; Three is take quarantine measures with it recipient, reduces noise to the harm of recipient.Route of transmission is controlled be the effective technology of a kind of tradition, comprised sound absorption, sound insulation, vibration isolation, damping vibration attenuation etc.Wherein utilize acoustic absorbant or sound absorption structure to absorb acoustic energy, reducing noise intensity is conventional the most succinct, effective control method
The microperforated panel resonance absorber that famous acoustics expert, academy of sciences academician Ma Dayou professor propose is a kind of conventional sound absorption structure.It is good that microperforated panel resonance sound-absorbing structure has high frequency sound absorbing capabilities, not containing porous fiber material, and not water funk and moisture, heatproof is prevented fires, not mould, do not eat into, clean, pollution-free, can be high temperature resistant, corrosion-resistant, can bear and high connect gas shock, good decorating effect, the advantage such as durable in use.Numerous scientist studies and produces the microperforated panel resonance sound-absorbing structure of various material, various structure, solves many sqouynd absorption lowering noise problems, as the sound quality problem of the Great Hall of the People, and the acoustical flaw problem etc. in reichstag hall.Meanwhile, in the sound absorption problem under the particular surroundings solving strong noise, as strong noise when rocket, MISSILE LAUNCHING is polluted, microperforated panel resonance sound-absorbing structure also plays an important role.Now, along with different materials, different structure, different processing technology are introduced in the making of microperforated panel gradually, the range of application of microperforated panel resonance sound-absorbing structure have also been obtained expansion.
But, common individual layer porous plate acoustic adsorption device, its penetration hole diameter
d, percentage of perforation
p, thickness of slab
tand cavity depth
ddeng structural parameters fixing after, its sound absorbing capabilities (maximum acoustical absorption coefficient and effectively sound sucting band) can be predicted according to the microperforated panel theory of classics.As a large amount of porous plate acoustic adsorption device aperture used is at about 0.8mm at present, percentage of perforation is between 3% ~ 5%, and its frequency span is about 1 ~ 2 octave, and effective sound sucting band is narrower.This shows, once design the various parameters of structure, the centre frequency of sound absorber is fixed and sound sucting band is limited.Now, the environment that use porous plate acoustic adsorption device carries out sqouynd absorption lowering noise is more complicated, and as the open environment such as large-sized power plant, road, noise signal has bandwidth and the feature of spectrum complex.In this case, a traditional porous plate acoustic adsorption device, is difficult to the applied environment of tackling these complexity, therefore in the urgent need to widening effective sound sucting band of porous plate acoustic adsorption device.The effective sound sucting band widening individual layer porous plate acoustic adsorption device at present has four kinds of main methods.First method is the microperforated panel soundabsorbing construction adopting MULTILAYER COMPOSITE, the structural parameters (percentage of perforation, penetration hole diameter, cavity depth and thickness of slab) of every one deck can be different, and the Be very effective of each layer combined action improves the sound absorbing capabilities of porous plate acoustic adsorption device at full frequency band.But multi-layer compound structure significantly increases structure complexity, also considerably increase material and processing cost, in practical engineering application, be also subject to the restriction of space length.Second method places acoustic absorbant at the microperforated panel back side of individual layer, but increase the secondary pollution that acoustic absorbant can bring total, do not play the advantage of microperforated panel as environmental type acoustic absorbant.The third method is the effective sound sucting band based on Piezoelectric Shunt Damping System technique extension individual layer porous plate acoustic adsorption device.Based on the Noise measarement of Shunt Damping System technology generally for the single mode of oscillation of low frequency, the frequency band improved effect of low-frequency sound absorption is narrower, and the divided circuit based on multiple mode can widen the absorption band of low frequency, but divided circuit structure is comparatively complicated.4th kind of method is the compound sound-absorption structural of main passive combination.By individual layer porous plate acoustic adsorption device with after the Active Absorption control system covered in cavity to combine composition compound sound-absorption structural, wide band high acoustic absorption performance can be realized.But Active Absorption control system causes the structure of whole sound absorber too complicated, is more easily subject to the restriction of space length in practical application.
Summary of the invention
The purpose of this utility model is to provide a kind of acoustic impedance regulating device based on self-adaptation micro-perforated plate sound absorber, this regulating device and control method thereof according to incident-noise acoustic characteristic real-time optimization microperforated panel resonance sound-absorbing structure acoustical absorption coefficient, and can significantly expand effective sound sucting band of microperforated panel resonance sound-absorbing structure.
For achieving the above object, the utility model have employed following technical scheme:
Based on an acoustic impedance regulating device for self-adaptation micro-perforated plate sound absorber, this regulating device comprises noise detector, adaptive controller, piezoelectric membrane driving circuit and piezoelectric membrane porous plate acoustic adsorption device; Described noise detector, probe placement is in noise circumstance, and its output terminal is connected with the input end of adaptive controller; Described adaptive controller, its output terminal is connected with the input end of piezoelectric membrane driving circuit; Described piezoelectric membrane driving circuit, its output terminal is connected with the outer electrode of piezoelectric membrane porous plate acoustic adsorption device; Described piezoelectric membrane porous plate acoustic adsorption device is piezoelectric membrane microperforated panel and the sound absorption structure covering thereafter back of the body chamber formation.
Described adaptive controller is the integrated circuit control panel based on general programmable dsp chip or special DSP chip design.Preferably, the chip that described adaptive controller adopts is the TMS320 series DSP chip that TI company produces.
Described piezoelectric membrane driving circuit comprises Double-way dc voltage-stabilizing source, signal power amplifier and audio-frequency transformer (AFT); Described Double-way dc voltage-stabilizing source, for powering for signal power amplifier; Described signal power amplifier, its input end is connected with the output terminal of adaptive controller, and its output terminal is connected with the input end of audio-frequency transformer (AFT); Described audio-frequency transformer (AFT), its output terminal is connected with the outer electrode of piezoelectric membrane porous plate acoustic adsorption device.
Described signal power amplifier is special high voltage and high current operational amplifier; Described audio-frequency transformer (AFT) is permalloy type audio boost transformer.
The output voltage of described piezoelectric membrane driving circuit is the single-frequency of 100Hz ~ 20KHz or the ac-excited signal of multifrequency.
The utility model utilizes the inverse piezoelectric effect of piezoelectric membrane to adjust piezoelectric membrane microperforated panel surface vibration velocity in real time, the acoustical absorption coefficient of microperforated panel resonance sound-absorbing structure can be optimized, significantly expand effective sound sucting band of microperforated panel resonance sound-absorbing structure, realize noise reduction as required.
The beneficial effects of the utility model are:
(1) compared with traditional MULTILAYER COMPOSITE microperforated panel resonance sound-absorbing structure, the utility model can meet the demand of wide-band sqouynd absorption lowering noise.
(2), compared with the individual layer microperforated panel placing acoustic absorbant with traditional back side, the utility model, based on self-adaptation micropunch sound absorber, can't bring secondary pollution.
(3), compared with the micro-perforated plate sound absorber of damping loss circuit external with tradition, the utility model effectively absorbs sound centre frequency and bandwidth can self-adaptative adjustment, realizes the sound absorption optimization in wide frequency range, is more suitable for the sqouynd absorption lowering noise requirement of complex environment.
(4) compared with the compound sound-absorption structural of the passive combination of traditional master, the utility model can realize the integrated of ACTIVE CONTROL module and microperforated panel resonance sound-absorbing structure, saves the space taken when whole sound absorber is installed.
Accompanying drawing explanation
Fig. 1 is the structural representation of the acoustic impedance regulating device based on self-adaptation micro-perforated plate sound absorber;
Fig. 2 is the high-level schematic functional block diagram of the acoustic impedance regulating device based on self-adaptation micro-perforated plate sound absorber;
Fig. 3 carries out the principle schematic of testing based on the acoustic impedance regulating device of self-adaptation micro-perforated plate sound absorber in impedance tube.
Wherein:
1, noise detector, 2, adaptive controller, 3, piezoelectric membrane driving circuit, 4, piezoelectric membrane microperforated panel, 5, back of the body chamber, 6, the outer electrode of sound absorber, 7, signal generator, 8, power amplifier, 9, sound source loudspeaker, 10, impedance tube, 11, B & K model 4190 microphone, 12, B & K model 4190 microphone, 13, B & K company PULSE7700 noise and vibration analysis software platform, 201, signal analyse block, 202, impedance conditioning signal computing module, 301, Double-way dc voltage-stabilizing source, 302, signal power amplifier, 303, audio-frequency transformer (AFT), 400, piezoelectric membrane porous plate acoustic adsorption device, 500, noise source.
Embodiment
Be described further the utility model below in conjunction with accompanying drawing, the utility model is applicable to single or multiple lift piezoelectric membrane micropunch sound absorber:
As shown in Figure 1 based on an acoustic impedance regulating device for self-adaptation micro-perforated plate sound absorber, this regulating device comprises noise detector 1, adaptive controller 2, piezoelectric membrane driving circuit 3 and piezoelectric membrane porous plate acoustic adsorption device 400.Described noise detector 1, probe placement is in noise circumstance, and its output terminal is connected with the input end of adaptive controller 2; Described adaptive controller 2, its output terminal is connected with the input end of piezoelectric membrane driving circuit 3; Described piezoelectric membrane driving circuit 3, its output terminal is connected with the outer electrode 6 of piezoelectric membrane porous plate acoustic adsorption device; Described piezoelectric membrane porous plate acoustic adsorption device is piezoelectric membrane microperforated panel 4 and the sound absorption structure covering thereafter back of the body chamber 5 formation.
A kind of acoustic impedance regulating device based on self-adaptation micro-perforated plate sound absorber as shown in Figure 2, this regulating device comprises noise detector 1, adaptive controller 2, piezoelectric membrane driving circuit 3 and piezoelectric membrane porous plate acoustic adsorption device 400.Described adaptive controller 2 comprises signal analyse block 201 and impedance conditioning signal computing module 202.Described piezoelectric membrane driving circuit 3 comprises Double-way dc voltage-stabilizing source 301, signal power amplifier 302 and audio-frequency transformer (AFT) 303.Described Double-way dc voltage-stabilizing source 301, for powering for signal power amplifier 302.Described piezoelectric membrane porous plate acoustic adsorption device 400 be peripheral hardware contact conductor piezoelectric membrane microperforated panel and after cover rigid back chamber.
As shown in Figure 3, signal generator 7, power amplifier 8, sound source loudspeaker 9, impedance tube 10, B & K model 4190 microphone 11, B & K model 4190 microphone 12 and B & K company PULSE7700 noise and vibration analysis software platform 13 together constitute the device that transfer function method measures acoustical absorption coefficient.In impedance tube 10, piezoelectric membrane microperforated panel face exposure is under the sound wave of vertical incidence, and the back side is an air chamber; Meanwhile, piezoelectric membrane microperforated panel is connected with outside piezoelectric membrane driver 3 by circuit lead end, produces vibration for driving piezoelectric membrane microperforated panel; Piezoelectric membrane driving circuit 3 is connected with adaptive controller 2, sends corresponding control signal by adaptive controller 2, controls the voltage that piezoelectric membrane driving circuit 3 exports suitable size; Adaptive controller 2 is connected with noise detector 1 again, and noise detector 1 face exposure, under the sound wave of vertical incidence, for detecting incident-noise signal, and is transferred to adaptive controller 3 and carries out computing, analyzes detection noise and also produces corresponding control signal; Noise detector 1, adaptive controller 2, piezoelectric membrane driving circuit 3 and piezoelectric membrane porous plate acoustic adsorption device 400 together constitute self-adaptation micropunch sound absorber.
The course of work and the principle of acoustic impedance adjustment and structure sound absorbing capabilities test experience are: signal generator 7 produces noise signal, after the power amplifier 8 of Classic board model 4.0B, be passed to moving-coil type sound source loudspeaker 9, sound source loudspeaker 9 is output noise signal in impedance tube 10; Noise is approximate in impedance tube 10 to be propagated with the form of plane wave, and impinges perpendicularly on the surface of piezoelectric membrane microperforated panel resonance sound-absorbing structure 400; Noise detector 1 detects incident-noise signal simultaneously, and passes to adaptive controller 2; Adaptive controller 2 comprehensively inputs information, produces control signal, controls piezoelectric membrane driver 3 and exports corresponding voltage to drive the ACTIVE CONTROL performer in piezoelectric membrane microperforated panel resonance sound-absorbing structure 400---piezoelectric membrane microperforated panel; Based on inverse piezoelectric effect, piezoelectric membrane produces vibration, and then can change surface emissivity impedance magnitude, regulates the acoustical absorption coefficient of piezoelectric membrane microperforated panel resonance sound-absorbing structure 400; Two microphone 11(12 near piezoelectric membrane microperforated panel resonance sound-absorbing structure 400 surface) each self-monitoring sound pressure signal is delivered to B & K PULSE7700 system simultaneously, utilizing transfer function method to calculate the acoustical absorption coefficient of piezoelectric membrane microperforated panel resonance sound-absorbing structure 400, obtaining driving voltage for feeding back fine setting theory calculate.
Above-described embodiment is only be described preferred implementation of the present utility model; not scope of the present utility model is limited; under not departing from the present invention and designing the prerequisite of spirit; the various distortion that those of ordinary skill in the art make technical scheme of the present invention and improvement, all should fall in protection domain that claims of the present invention determines.
Claims (3)
1. based on an acoustic impedance regulating device for self-adaptation micro-perforated plate sound absorber, it is characterized in that: this regulating device comprises noise detector (1), adaptive controller (2), piezoelectric membrane driving circuit (3) and piezoelectric membrane porous plate acoustic adsorption device (400); Described noise detector (1), probe placement is in noise circumstance, and its output terminal is connected with the input end of adaptive controller (2); Described adaptive controller (2), its output terminal is connected with the input end of piezoelectric membrane driving circuit (3); Described piezoelectric membrane driving circuit (3), its output terminal is connected with the outer electrode (6) of piezoelectric membrane porous plate acoustic adsorption device (400); Described piezoelectric membrane porous plate acoustic adsorption device (400) is for piezoelectric membrane microperforated panel (4) and cover thereafter the sound absorption structure of carrying on the back chamber (5) and forming;
Described piezoelectric membrane driving circuit (3) comprises Double-way dc voltage-stabilizing source (301), signal power amplifier (302) and audio-frequency transformer (AFT) (303); Described Double-way dc voltage-stabilizing source (301), for powering for signal power amplifier; Described signal power amplifier (302), its input end is connected with the output terminal of adaptive controller (2), and its output terminal is connected with the input end of audio-frequency transformer (AFT) (303); Described audio-frequency transformer (AFT) (303), its output terminal is connected with the outer electrode (6) of piezoelectric membrane porous plate acoustic adsorption device (400).
2. a kind of acoustic impedance regulating device based on self-adaptation micro-perforated plate sound absorber according to claim 1, is characterized in that: described signal power amplifier (302) is special high voltage and high current operational amplifier; Described audio-frequency transformer (AFT) (303) is permalloy type audio boost transformer.
3. a kind of acoustic impedance regulating device based on self-adaptation micro-perforated plate sound absorber according to claim 1, is characterized in that: the output voltage of described piezoelectric membrane driving circuit (3) is the single-frequency of 100Hz ~ 20KHz or the ac-excited signal of multifrequency.
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| CN201520150481.4U CN204516347U (en) | 2015-03-17 | 2015-03-17 | Based on the acoustic impedance regulating device of self-adaptation micro-perforated plate sound absorber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107316632A (en) * | 2017-06-14 | 2017-11-03 | 中国农业大学 | A kind of sound absorber and sound absorption method |
| CN108430016A (en) * | 2018-04-06 | 2018-08-21 | 西北工业大学 | A kind of closing cavate PVDF thin film loud speaker |
| CN112365872A (en) * | 2020-11-10 | 2021-02-12 | 国网北京市电力公司 | Noise reduction regulation and control method, device and system and processor |
-
2015
- 2015-03-17 CN CN201520150481.4U patent/CN204516347U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107316632A (en) * | 2017-06-14 | 2017-11-03 | 中国农业大学 | A kind of sound absorber and sound absorption method |
| CN108430016A (en) * | 2018-04-06 | 2018-08-21 | 西北工业大学 | A kind of closing cavate PVDF thin film loud speaker |
| CN108430016B (en) * | 2018-04-06 | 2020-04-03 | 西北工业大学 | Closed cavity type PVDF film loudspeaker |
| CN112365872A (en) * | 2020-11-10 | 2021-02-12 | 国网北京市电力公司 | Noise reduction regulation and control method, device and system and processor |
| CN112365872B (en) * | 2020-11-10 | 2024-05-28 | 国网北京市电力公司 | Noise reduction regulation method, device and system and processor |
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Granted publication date: 20150729 |
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| CF01 | Termination of patent right due to non-payment of annual fee |