CN107274880A - A kind of non-linear magnetic force negative stiffness Active Absorption device - Google Patents
A kind of non-linear magnetic force negative stiffness Active Absorption device Download PDFInfo
- Publication number
- CN107274880A CN107274880A CN201710539214.XA CN201710539214A CN107274880A CN 107274880 A CN107274880 A CN 107274880A CN 201710539214 A CN201710539214 A CN 201710539214A CN 107274880 A CN107274880 A CN 107274880A
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- electromagnet
- sound absorption
- negative stiffness
- magnetic force
- vibrating diaphragm
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 72
- 239000011159 matrix material Substances 0.000 claims abstract description 23
- 230000001788 irregular Effects 0.000 claims description 3
- 239000006096 absorbing agent Substances 0.000 abstract description 5
- 230000003044 adaptive effect Effects 0.000 abstract description 4
- 239000012528 membrane Substances 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
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Abstract
The present invention relates to noise control technique field, more particularly to a kind of non-linear magnetic force negative stiffness Active Absorption device.It includes sound absorption structure, modulation controller and noise frequency acquisition elements；The sound absorption structure includes matrix, vibrating diaphragm and electromagnet, described matrix is hollow and open top, and the vibrating diaphragm covers the open-mouth in described matrix, and the vibrating diaphragm and matrix surround sound absorption cavity jointly, the sound absorption cavity bottom is provided with electromagnet, and the vibrating diaphragm outer surface is provided with irony piece；Described modulation controller one end is electrically connected with the electromagnet, and the other end is connected as receiver port with the signal output port of the noise frequency acquisition elements.The sound absorber can be according to the difference of noise frequency, change electromagnet to act on the negative stiffness of film, make the resonant frequency of membrane structure consistent with noise frequency, realize the controllable Active Absorption performance for different frequency noise, expand effective sound sucting band of sound absorption structure, strengthen the adaptive capacity to environment of sound absorption structure.
Description
Technical field
The present invention relates to noise control technique field, more particularly to a kind of non-linear magnetic force negative stiffness Active Absorption dress
Put.
Background technology
In field of noise control, membrane material is one of conventional sound-absorbing material.The composition resonance of film combination closed cavity is inhaled
Acoustic form, its sound absorption characteristics are relevant with the tension force of film, surface density and back of the body chamber depth, generally have near resonant frequency preferably
Sound absorbing capabilities, practical application combines the methods such as micropunch to expand its wide band sound absorption often.
Microperforated absorber occupies extremely important status in numerous resonance sound-absorbing structures.From last century 70
Age Ma Dayou academician lays a foundation after sex work, and microperforated panel soundabsorbing construction is as a kind of important Measures on Noise Control in difference
Field extensive use, and constantly derive new structure and application.Including tube bundle perforated plate sound absorption structure, tube bank is utilized
With low frequency absorption performance in pipe-chamber resonance lifting of cavity；The measures such as mechanical impedance are taken to improve the sound absorption of microperforated panel structure
Bandwidth etc..
For the low frequency absorption performance of further lift structure, a kind of thought of more novelty is on the basis of microperforated panel
Upper introducing active control, formation master-passively mix sound absorption structure.In other resonant structures, more typically shunting is raised one's voice
The low-frequency resonance sound absorption structure that device design is realized.Separately there is a kind of film absorption type acoustic metamaterial, it is with not right by one
Claim the elastic film of rigid platelet to constitute, the purpose so selected be in order in resonant frequency from 100 to 1000Hz in the range of can
With the low-frequency sound wave propagated in fully absorption air.Also a kind of magnetic force negative stiffness sound absorber, can use smaller back of the body chamber knot
Structure realizes low frequency absorption, but resonant frequency is fixed, and adaptive capacity to environment is poor.In consideration of it, the solution magnetic force that urgently looks for another way is negative firm
The problem of spending the environment self-adaption ability of film sound absorber.
The content of the invention
(1) technical problem to be solved
The technical problem to be solved in the present invention is how to realize the low frequency Active Absorption of magnetic force negative stiffness device, to strengthen it
Environment self-adaption ability.
(2) technical scheme
In order to solve the above-mentioned technical problem, the invention provides a kind of non-linear magnetic force negative stiffness Active Absorption device, its
Including sound absorption structure, modulation controller and noise frequency acquisition elements；
The sound absorption structure includes matrix, vibrating diaphragm and electromagnet, and described matrix is hollow and open top, and the vibrating diaphragm is covered
In the open-mouth of described matrix, the vibrating diaphragm and matrix surround sound absorption cavity jointly, and the electromagnet is located at sound absorption cavity bottom,
The vibrating diaphragm outer surface is provided with irony piece；
Described modulation controller one end is electrically connected with the electromagnet, and the other end is used as receiver port and the noise
The signal output port connection of frequency collection element.
The noise frequency acquisition elements are according to the noise frequency of collection so that modulation controller is defeated to the electric current of electromagnet
Go out to be adjusted, the negative stiffness of film is acted on so as to change electromagnet, the resonant frequency and noise frequency of membrane structure is adjusted
Unanimously so that sound absorption structure can change according to the change of noise frequency.
Further, the electromagnet and irony piece are oppositely arranged.
Further, the electromagnet is located at the bottom centre of the sound absorption cavity, and/or, the irony piece is located at institute
State the center of vibrating diaphragm.
Further, the electromagnet is multiple, and/or, the irony piece is multiple.
Further, the noise frequency acquisition elements are arranged on the outside of the sound absorption structure, for obtaining external environment
In noise frequency.
Further, the irony piece is shaped as rectangle, hexagon, ellipse or irregular shape.
Further, the modulation controller is connected by lead with the magnet spool.
Further, described matrix is rigid body.
Further, the open edge of described matrix is coated on the periphery of the vibrating diaphragm, is tightly connected with being formed.
(3) beneficial effect
The above-mentioned technical proposal of the present invention has the advantages that：
The non-linear magnetic force negative stiffness Active Absorption device of the present invention, electromagnet attracts each other with irony piece, forms electricity
Magnet is acted on the non-linear negative stiffness of vibrating diaphragm, and then the Active Absorption device obtains environment by noise frequency acquisition elements and made an uproar
Acoustic frequency, and the noise frequency signal is transmitted to modulation controller, modulation controller is according to the noise frequency of reception to electromagnetism
The electric current output of iron is adjusted, that is, applies feedback voltage or electric current to electromagnet, vibrating diaphragm is born so as to change electromagnet
Stiffness, the resonant frequency for adjusting diaphragm structure is consistent with noise frequency so that the sound absorbing capabilities of the sound absorption structure being capable of root
Change according to the change of noise frequency, finally realize controllable Active Absorption of the sound absorption structure for different frequency noise, expand
Effective sound sucting band of the sound absorption structure, enhances the adaptive capacity to environment of sound absorption structure.
Brief description of the drawings
Fig. 1 is the structural representation of non-linear magnetic force negative stiffness Active Absorption device described in the embodiment of the present invention；
Wherein, 1, sound absorption cavity；2nd, vibrating diaphragm；3rd, irony piece；4th, electromagnet；5th, matrix；6th, noise frequency acquisition elements；7、
Modulation controller.
Embodiment
Embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples.Following examples are used for
Illustrate the present invention, but can not be used for limiting the scope of the present invention.
In the description of the invention, unless otherwise indicated, " multiple " are meant that two or more；Term " on ",
" under ", " interior ", " outer ", " top ", " bottom ", " front end ", " rear end ", " head ", the orientation of the instruction such as " afterbody " or position relationship be
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than indicate or dark
Specific orientation must be had, with specific azimuth configuration and operation by showing the device or element of meaning, therefore it is not intended that right
The limitation of the present invention.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected to by intermediary.For this
For the those of ordinary skill in field, concrete condition can be regarded and understand the concrete meaning of above-mentioned term in the present invention.
As shown in figure 1, present embodiments providing a kind of non-linear magnetic force negative stiffness Active Absorption device, it includes sound absorption knot
Structure, modulation controller 7 and noise frequency acquisition elements 6；
Sound absorption structure includes matrix 5, vibrating diaphragm 2 and electromagnet 4；Matrix 5 is rigid body, hollow and open top；Vibrating diaphragm 2 covers
Located at the open-mouth of matrix 5, the open edge of matrix 5 is coated on the periphery of vibrating diaphragm 2, is tightly connected with being formed；Vibrating diaphragm 2 and matrix
5 surround sound absorption cavity 1 jointly, and the electromagnet 4 is located at the sound absorption bottom of cavity 1 (i.e. the bottom of matrix 5), the outer surface of vibrating diaphragm 2 bonding
There is irony piece 3；
The one end of modulation controller 7 is connected by lead with the coil of electromagnet 4, and the other end is as receiver port with making an uproar
The signal output port connection of acoustic frequency acquisition elements 6；Noise frequency acquisition elements 6 are arranged on the outside of sound absorption structure, for obtaining
Take the noise frequency in external environment.
Electromagnet 4 attracts each other with irony piece 3, forms electromagnet 4 and the non-linear negative stiffness of vibrating diaphragm 2 is acted on.Electromagnetism
Iron 4 and irony piece 3 are preferably to be oppositely arranged, and electromagnet 4 is located at the bottom centre of sound absorption cavity 1, and irony piece 3 is located at vibrating diaphragm 2
Center.Electromagnet 4 and irony piece 3 in the present embodiment can be multiple.In addition, the shape of the irony piece 3 of the present embodiment can be with
For various shapes such as rectangle, hexagon, ellipse or irregular shapes.It should be noted that irony piece 3 and electromagnet 4
Position and quantity arrangement, are only used for illustrative.
During work, the sound absorber obtains ambient noise frequency by noise frequency acquisition elements 6, and by the noise frequency
Signal is transmitted to modulation controller 7, and modulation controller 7 is defeated to the electric current of electromagnet 4 according to the noise frequency Signal Regulation of reception
Go out, that is, apply feedback voltage or electric current to electromagnet 4, the negative stiffness of vibrating diaphragm 2 is acted on so as to change electromagnet 4, regulation is shaken
The resonant frequency of membrane structure is consistent with noise frequency so that the sound absorption structure can change according to the change of noise frequency, most
Controllable Active Absorption performance of the sound absorption structure for different frequency noise is realized eventually, expands effective sound absorption frequency of the sound absorption structure
Band, strengthens the adaptive capacity to environment of sound absorption structure.
Sound wave is via the vibrating diaphragm 2 with irony piece 3 and sound absorption cavity 1, under magneticaction of the electromagnet 4 to irony piece 3,
Realize the sound absorption power consumption of negative stiffness compact structure, i.e. the acoustically effective of more low frequency is realized under same cavity depth；Or
The depth of sound absorption cavity 1 under same sound absorption frequency is smaller, more compact structure, frivolous, takes less.Meanwhile, modulation controller 7
The magnetic field of electromagnet 4 is adjusted the ambient noise frequency collected according to noise frequency acquisition elements 6, realizes sound absorption structure
The frequency that absorbs sound is automatically adjustable with environment, reaches the purpose of Active Absorption.
Embodiments of the invention are provided for the sake of example and description, and are not exhaustively or by this to send out
It is bright to be limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Choosing
Select and describe embodiment and be more preferably to illustrate the principle and practical application of the present invention, and make one of ordinary skill in the art
It will be appreciated that the present invention is so as to design the various embodiments with various modifications suitable for special-purpose.
Claims (8)
1. a kind of non-linear magnetic force negative stiffness Active Absorption device, it is characterised in that including sound absorption structure, modulation controller and
Noise frequency acquisition elements；
The sound absorption structure includes matrix, vibrating diaphragm and electromagnet, and described matrix is hollow and open top, and the vibrating diaphragm is covered in institute
The open-mouth of matrix is stated, the vibrating diaphragm and matrix surround sound absorption cavity jointly, and the electromagnet is described located at sound absorption cavity bottom
Vibrating diaphragm outer surface is provided with irony piece；
Described modulation controller one end is electrically connected with the electromagnet, and the other end is used as receiver port and the noise frequency
The signal output port connection of acquisition elements.
2. non-linear magnetic force negative stiffness Active Absorption device according to claim 1, it is characterised in that the electromagnet and
Irony piece is oppositely arranged.
3. non-linear magnetic force negative stiffness Active Absorption device according to claim 1, it is characterised in that the electromagnet is
It is multiple, and/or, the irony piece is multiple.
4. non-linear magnetic force negative stiffness Active Absorption device according to claim 1, it is characterised in that the noise frequency
Acquisition elements are arranged on the outside of the sound absorption structure, for obtaining the noise frequency in external environment.
5. non-linear magnetic force negative stiffness Active Absorption device according to claim 1, it is characterised in that the irony piece
It is shaped as rectangle, hexagon, ellipse or irregular shape.
6. non-linear magnetic force negative stiffness Active Absorption device according to claim 1, it is characterised in that the modulation control
Device is connected by lead with the magnet spool.
7. non-linear magnetic force negative stiffness Active Absorption device according to claim 1, it is characterised in that described matrix is firm
Property body.
8. non-linear magnetic force negative stiffness Active Absorption device according to claim 1, it is characterised in that described matrix it is spacious
Mouth edge is coated on the periphery of the vibrating diaphragm, is tightly connected with being formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710539214.XA CN107274880A (en) | 2017-07-04 | 2017-07-04 | A kind of non-linear magnetic force negative stiffness Active Absorption device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710539214.XA CN107274880A (en) | 2017-07-04 | 2017-07-04 | A kind of non-linear magnetic force negative stiffness Active Absorption device |
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| Publication Number | Publication Date |
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| CN107274880A true CN107274880A (en) | 2017-10-20 |
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| CN201710539214.XA Pending CN107274880A (en) | 2017-07-04 | 2017-07-04 | A kind of non-linear magnetic force negative stiffness Active Absorption device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107989530A (en) * | 2018-01-22 | 2018-05-04 | 青岛理工大学 | A kind of active noise reducing device and control method applied to multiple-glazing unit |
| CN110415675A (en) * | 2019-08-22 | 2019-11-05 | 北京市劳动保护科学研究所 | The sound arrester of adjustable acoustic characteristic |
| CN110415674A (en) * | 2019-08-22 | 2019-11-05 | 北京市劳动保护科学研究所 | Sound insulating structure |
| CN111489728A (en) * | 2019-12-13 | 2020-08-04 | 中国舰船研究设计中心 | Active acoustic metamaterial based on local resonance |
| CN113112975A (en) * | 2021-04-20 | 2021-07-13 | 南京富罗新环保科技有限公司 | Sound absorption plate with electromagnetic sound absorption structure |
| CN113257216A (en) * | 2021-06-23 | 2021-08-13 | 北京市劳动保护科学研究所 | Magnetic low-frequency broadband sound absorption and insulation board |
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| US20070014418A1 (en) * | 2005-07-14 | 2007-01-18 | Eatwell Graham P | Vibration excited sound absorber with dynamic tuning |
| CN102332259A (en) * | 2011-10-12 | 2012-01-25 | 中国科学院合肥物质科学研究院 | Adaptive micro-perforated plate sound absorber and real-time micropore adjusting method thereof |
| CN104575483A (en) * | 2014-12-29 | 2015-04-29 | 北京市劳动保护科学研究所 | Controllable sound absorption structure |
| CN104681021A (en) * | 2015-02-11 | 2015-06-03 | 上海交通大学 | Magnetic-field-adjustable low-frequency sound insulation structure and sound insulation material |
| CN104751836A (en) * | 2015-03-03 | 2015-07-01 | 北京市劳动保护科学研究所 | Magnetic negative-stiffness sound absorption device and method |
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2017
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| US20070014418A1 (en) * | 2005-07-14 | 2007-01-18 | Eatwell Graham P | Vibration excited sound absorber with dynamic tuning |
| CN102332259A (en) * | 2011-10-12 | 2012-01-25 | 中国科学院合肥物质科学研究院 | Adaptive micro-perforated plate sound absorber and real-time micropore adjusting method thereof |
| CN104575483A (en) * | 2014-12-29 | 2015-04-29 | 北京市劳动保护科学研究所 | Controllable sound absorption structure |
| CN104681021A (en) * | 2015-02-11 | 2015-06-03 | 上海交通大学 | Magnetic-field-adjustable low-frequency sound insulation structure and sound insulation material |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107989530A (en) * | 2018-01-22 | 2018-05-04 | 青岛理工大学 | A kind of active noise reducing device and control method applied to multiple-glazing unit |
| CN107989530B (en) * | 2018-01-22 | 2023-08-22 | 青岛理工大学 | Active noise reduction device applied to multi-layer glass window and control method |
| CN110415675A (en) * | 2019-08-22 | 2019-11-05 | 北京市劳动保护科学研究所 | The sound arrester of adjustable acoustic characteristic |
| CN110415674A (en) * | 2019-08-22 | 2019-11-05 | 北京市劳动保护科学研究所 | Sound insulating structure |
| CN111489728A (en) * | 2019-12-13 | 2020-08-04 | 中国舰船研究设计中心 | Active acoustic metamaterial based on local resonance |
| CN111489728B (en) * | 2019-12-13 | 2024-03-26 | 中国舰船研究设计中心 | Active acoustic metamaterial based on local resonance |
| CN113112975A (en) * | 2021-04-20 | 2021-07-13 | 南京富罗新环保科技有限公司 | Sound absorption plate with electromagnetic sound absorption structure |
| CN113257216A (en) * | 2021-06-23 | 2021-08-13 | 北京市劳动保护科学研究所 | Magnetic low-frequency broadband sound absorption and insulation board |
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Application publication date: 20171020 |
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