CN205487325U - Magnetic force burden rigidity multifrequency sound absorption device - Google Patents
Magnetic force burden rigidity multifrequency sound absorption device Download PDFInfo
- Publication number
- CN205487325U CN205487325U CN201620095545.XU CN201620095545U CN205487325U CN 205487325 U CN205487325 U CN 205487325U CN 201620095545 U CN201620095545 U CN 201620095545U CN 205487325 U CN205487325 U CN 205487325U
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- sound absorption
- magnetic bar
- quality sheet
- vibrating diaphragm
- absorption unit
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 85
- 239000011159 matrix material Substances 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910001021 Ferroalloy Inorganic materials 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 239000006096 absorbing agent Substances 0.000 description 8
- 239000010408 film Substances 0.000 description 4
- 230000001788 irregular Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000010409 thin film Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
The utility model provides a pair of magnetic force burden rigidity multifrequency sound absorption device relates to the sound absorption field, including a plurality of continuous sound absorption units, the sound absorption unit includes: base member, vibrating diaphragm, quality piece and magnetic rod, the base member is for having cavity and upper surface open -ended casing, the base member upper surface by the vibrating diaphragm is sealed, the quality piece place in the vibrating diaphragm top, magnetic rod is vertical to be arranged in in the cavity of base member, in the adjacent sound absorption unit magnetic rod highly varies. The utility model provides a highly the varying of magnetic rod of every sound absorption unit for the resonance frequency of every sound absorption unit is also different, has increased magnetic force burden rigidity multifrequency sound absorbing structure's sound absorption bandwidth, thereby has improved the sound absorption effect.
Description
Technical field
This utility model relates to sound absorption field, particularly relates to a kind of magnetic force negative stiffness multifrequency device.
Background technology
In field of noise control, membrane material is one of conventional sound-absorbing material.Thin film combines to be closed
Cavity composition resonance sound-absorbing structure, its sound absorption characteristics are deep with the tension force of film, surface density and back of the body chamber
Spend relevant, generally have preferable sound absorbing capabilities, actual application often to combine near resonant frequency
The methods such as micropunch expand its wide band sound absorption.
Microperforated absorber, in numerous resonance sound-absorbing structures, occupies extremely important status.
After the founder work of the seventies Ma Dayou academician in last century, microperforated panel soundabsorbing construction is made
Extensively apply in different field for a kind of important Measures on Noise Control, and constantly derivative make new advances
Structure and application.Including tube bundle perforated plate sound absorption structure, utilize the pipe of tube bank and cavity-
Chamber resonance promotes medium and low frequency sound absorbing capabilities；The measures such as mechanical impedance are taked to harden to improve micropunch
Structure wide band sound absorption.On the basis of microperforated panel, the resonance of other forms of some scholar's research
Sound absorption structure, such as Slit Resonance Sound Absorption Structure, micropunch thin film sound absorption structure etc..These sound absorption structures
With the resonance sound-absorbing that microperforated panel is based on identical principle, i.e. hole/seam and cavity.
In order to promote the low frequency absorption performance of microperforated absorber further, one is the most novel
Thought be to introduce actively to control on the basis of microperforated panel, form main-passive mixing sound absorption knot
Structure.In other resonant structures, compare the low frequency that typically shunt loudspeaker design realizes and be total to
Shake sound absorption structure, also one film absorption type acoustic metamaterial, and it is with the most right by one
Claim rigidity platelet elastic film constitute, so selection purpose be in order at resonant frequency from 100
The low-frequency sound wave propagated in air can be fully absorbed in the range of 1000Hz.
But in above structure, all it is not directed to solve that low-frequency resonance sound absorption structure is carried on the back chamber deep simultaneously
Spend compared with big and that low frequency frivolous structure midband is narrower problem so that this structure is frivolous at needs
The practical engineering application of sound absorption structure encounters certain difficulty.In consideration of it, the most separately ward off footpath
Footpath solves thin film/plate sound absorption structure low frequency absorption back of the body chamber and relatively greatly and is difficult to thin low-frequency sound absorption knot
The problem of structure.
Utility model content
For the defect of prior art, the utility model proposes and solve the one of above-mentioned technical problem
Plant magnetic force negative stiffness multifrequency sound absorption device, it is achieved thin low-frequency acoustically effective.
This utility model provides a kind of magnetic force negative stiffness multifrequency sound absorption device, including multiple connected
Sound absorption unit, described sound absorption unit includes: matrix, vibrating diaphragm, quality sheet and magnetic bar；Described
Matrix is the housing with cavity and upper surface open, and described body upper surface is close by described vibrating diaphragm
Envelope, described quality sheet is positioned over above described vibrating diaphragm, and described magnetic bar is vertically placed to described matrix
Cavity in, the height of the described magnetic bar in adjacent sound absorption unit.
Preferably, the height of the magnetic bar in the plurality of sound absorption unit is periodic arrangement.
Preferably, described quality sheet is iron plate or ferroalloy sheet.
Preferably, described magnetic bar is located at the underface of described quality sheet.
Preferably, close mutually between the plurality of sound absorption unit.
Preferably, the height maximum of described magnetic bar meet be vertically placed at described magnetic bar described
Time in matrix, described magnetic bar can not hold the condition of described quality sheet just.
Preferably, described vibrating diaphragm is elastic film.
Preferably, described quality sheet be shaped as rectangle, hexagon, ellipse or irregular
Shape；Described bar magnet is cylinder or irregular structure.
As shown from the above technical solution, a kind of magnetic force negative stiffness multifrequency that this utility model provides is inhaled
Acoustic device, each sound absorption unit utilizes and is provided with quality sheet and magnetic bar between described vibrating diaphragm and matrix
Form the magnetic spring with negative stiffness, weaken air spring by the negative stiffness of magnetic spring
Positive rigidity, realize low frequency absorption with less cavity depth.The magnetic bar of each sound absorption unit
Height, real by changing in each cavity structure the distance between magnetic bar and quality sheet
The change of existing magnetic spring negative stiffness, bearing of the magnetic spring formed between quality sheet and magnetic bar
Rigidity is different so that the resonant frequency of each sound absorption unit is the most different, and whole device has many
Individual absworption peak, adds the wide band sound absorption of magnetic force negative stiffness multifrequency sound absorption structure, thus improves
Acoustically effective.
Accompanying drawing explanation
The structural representation of the magnetic force negative stiffness sound absorber that Fig. 1 a provides for this utility model embodiment
Figure；
The structure of the magnetic force negative stiffness sound absorber that Fig. 1 b provides for this utility model embodiment is overlooked
Figure；
Fig. 2 is model of vibration schematic diagram；
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, detailed description of the invention of the present utility model is made further
Describe in detail.Following example are used for illustrating this utility model, but it is new to be not limited to this practicality
The scope of type.
Fig. 1 a shows the knot of the magnetic force negative stiffness sound absorber that this utility model one embodiment provides
Structure schematic diagram, the magnetic force negative stiffness sound absorber that Fig. 1 b provides for this utility model one embodiment
Structure top view, as illustrated in figs. ia and ib, the magnetic force negative stiffness sound absorber of the present embodiment
Multiple sound absorption unit 11, described sound absorption unit includes: matrix 12, vibrating diaphragm 13, quality sheet 14
With magnetic bar 15；Described matrix 12 is the housing with cavity and upper surface open, described matrix
12 upper surfaces are sealed by described vibrating diaphragm 13, and described quality sheet 14 is positioned over above described vibrating diaphragm 13,
Described magnetic bar 15 is vertically placed in the cavity of described matrix 12, in adjacent sound absorption unit
The height of described magnetic bar 15.
Wherein, magnetic-adsorption effect, each sound absorption are formed between magnetic bar 15 and quality sheet 14
The shape of unit 11 can be rectangle or other rule shapes according to the shape even partition of matrix 12 wall
Shape.
In the present embodiment, by each sound absorption unit 11 utilize described vibrating diaphragm 13 and matrix 12 it
Between be provided with quality sheet 14 and form the magnetic spring with negative stiffness with magnetic bar 15, pass through magnetic force
The negative stiffness of spring weakens the positive rigidity of air spring, realizes low frequency with less cavity depth
Sound absorption.The height of the magnetic bar 15 of each sound absorption unit 11, by changing each tube chamber
In structure, distance between magnetic bar 15 and quality sheet 14 realizes the change of magnetic spring negative stiffness,
The negative stiffness of the magnetic spring formed between quality sheet 14 and magnetic bar 15 is different so that
The resonant frequency of each sound absorption unit 11 is the most different, adds magnetic force negative stiffness multifrequency sound absorption structure
Wide band sound absorption, thus change the acoustically effective of whole sound absorption structure.
Further, the height of the magnetic bar 15 in the plurality of sound absorption unit 11 is in periodically
Arrangement so that the frequency that each sound absorption unit 11 absorbs sound differs and absorbable sound
Frequency presses periodic arrangement.
In the present embodiment, the magnetic bar 15 of periodic arrangement can periodically absorb different frequency range
Sound, whole device has multiple absworption peak, has the sound absorption characteristics of multifrequency, wideband.
Further, described quality sheet 14 is iron plate or ferroalloy sheet.
In the present embodiment, vibrating diaphragm 13 center that each sound absorption unit 11 is posted is provided with quality
Sheet 14, quality sheet 14 is iron plate or ferroalloy sheet, passes through between quality sheet 14 and magnetic bar 15
Magnetic force is attracted each other.
Further, described magnetic bar 15 is located at the underface of described quality sheet 14.
In the present embodiment, described magnetic bar 15 is cylinder or irregular structure, is located at each
In the cavity of sound absorption unit 11 and be positioned at immediately below quality sheet 14 so that described quality sheet 14 with
Magnetic bar 15 attracts each other.
By magnetic bar 15 being located at the underface of quality sheet 14 so that quality sheet 14 and magnetic force
Maximum being utilized of magnetic force between rod 15.
Further, close mutually between the plurality of sound absorption unit 11.
The height maximum of described magnetic bar 15 meets and is vertically placed to described base at described magnetic bar 15
Time in body 12, described magnetic bar 15 can not hold the condition of described quality sheet 14 just.
Further, the height of described magnetic bar 15 is described quality sheet 14 to the maximum at natural shape
Under state, the minimum point of described vibrating diaphragm 13 is to the distance bottom described matrix 12, minimum described magnetic
Power rod 15 can not hold the distance of described quality sheet 14 just.
In the present embodiment, the distance between described magnetic bar 15 and quality sheet 14 is adjustable, by changing
The distance become in each unit between magnetic bar 15 and quality sheet 14 realizes magnetic spring negative stiffness
Change, cause the change of rigidity in each sound absorption unit 11.
Owing in each sound absorption unit 11, magnetic bar 15 is different from the distance of quality sheet 14, quality
Sheet 14 is the most different with the negative stiffness of the magnetic spring that magnetic bar 15 is formed, for positive rigidity
Weaken different so that the sound absorption frequency of each sound absorption unit 11 is the most different, thus changes
The acoustically effective of whole cycle sound absorption structure.
Wherein, the depth bounds I of sound absorption unit 11 cavity regulates between 1～10cm,
Owing to the distance between the magnetic bar 15 in each sound absorption unit 11 and quality sheet 14 is cycle row
Cloth, the sound of absorbable different frequency range, this cycle sound absorption structure can be with less cavity depth
Realize low frequency absorption, there are the sound absorption characteristics of multifrequency, wideband.
Further, described quality sheet 14 be shaped as rectangle, hexagon, ellipse or not
Regular shape；Described bar magnet is cylinder or irregular structure.
The operation principle of above-mentioned magnetic force negative stiffness sound absorber is described below；
When sound wave arrives vibrating diaphragm 13 surface, sound wave is respectively via the vibrating diaphragm with quality sheet 14
13 and described cavity, the magnetic bar 15 in cavity has magnetic force and attracts to make quality sheet 14 simultaneously
With, first with the sound absorption power consumption of vibrating diaphragm 13 vibration, sound wave causes vibrating diaphragm 13 to vibrate, drives
Quality sheet 14 vibrates therewith, enters in the cavity in rigid walls.Described vibrating diaphragm 13 and cavity wall
The system of the sound absorption cavity composition surrounded is similar to Helmholz resonance device, model of vibration such as Fig. 2
Spring mass model in shown single sound absorption unit, forms quality with the vibrating diaphragm of quality sheet
Block 23, vibrating diaphragm, cavity and rigid walls are collectively forming air spring 21, described quality sheet and magnetic force
The suction structure of rod composition, forms the magnetic spring 22 with negative stiffness.Bearing of magnetic spring 22
Rigidity is resisted mutually with the positive rigidity of air spring 21 in sound absorption cavity, it is possible to realize this structure
Low frequency absorption.
In the suction structure of quality sheet and magnetic bar composition distance between magnetic bar and quality sheet in
Cycle arranges, the sound of absorbable different frequency range, can be by changing magnetic in each sound absorption unit
Distance between power rod and quality sheet realizes the change of magnetic spring negative stiffness, so that each
The acoustically effective of unit is different；This cycle sound absorption structure is capable of with less cavity depth real
Existing low frequency absorption, has the sound absorption characteristics of multifrequency, wideband.
It should be noted that the distance between the quantity of cavity, arrangement and magnetic bar and quality sheet,
It is only used for illustrative, can set according to practical situation, be not intended as this practicality new
The concrete restriction of type.Meanwhile, magnetic bar add magnetic mode, as long as meet aforementioned sound absorption community
Function need all in the range of the application is claimed.
It will be understood by those skilled in the art that and the module in the equipment in embodiment can be carried out
Adaptively change and they are provided in one or more equipment that this embodiment is different
In.Module in embodiment or unit or assembly can be combined into a module or unit or group
Part, and multiple submodule or subelement or sub-component can be put them in addition.Except this
At least some in the feature of sample and/or process or unit is mutually exclusive part, can use
Any combination is to the institute disclosed in this specification (including adjoint claim, summary and accompanying drawing)
Feature and the disclosedest any method or all processes of equipment or unit is had to carry out group
Close.Unless expressly stated otherwise, this specification (including adjoint claim, summary and accompanying drawing)
Disclosed in each feature can be carried out generation by providing identical, equivalent or the alternative features of similar purpose
Replace.
Although additionally, it will be appreciated by those of skill in the art that embodiments more described herein
Including some feature included in other embodiments rather than further feature, but different enforcement
The combination of the feature of example means to be within the scope of this utility model and form different realities
Execute example.Such as, in the following claims, embodiment required for protection any it
One can mode use in any combination.
All parts embodiment of the present utility model can realize with hardware, or with at one or
The software module run on the multiple processor of person realizes, or realizes with combinations thereof.Should
It is to be noted that this utility model is illustrated rather than by above-described embodiment, this utility model is carried out
Limit, and those skilled in the art without departing from the scope of the appended claims may be used
Design alternative embodiment.In the claims, any reference between bracket should not will be located in
Symbol construction becomes limitations on claims.Word " comprises " not exclude the presence of and is not listed in right
Element in requirement or step.Word "a" or "an" before being positioned at element is not excluded for
There is multiple such element.This utility model can be by means of including some different elements
Hardware and realizing by means of properly programmed computer.If listing the unit of equipment for drying
In claim, several in these devices can be to carry out concrete body by same hardware branch
Existing.Word first, second and third use do not indicate that any order.Can be by these
Word explanation is title.
Last it is noted that one of ordinary skill in the art will appreciate that: various embodiments above
Only in order to the technical solution of the utility model to be described, it is not intended to limit；Although with reference to aforementioned respectively
This utility model has been described in detail by embodiment, and those of ordinary skill in the art should
Understand: the technical scheme described in foregoing embodiments still can be modified by it, or
The most some or all of technical characteristic is carried out equivalent；And these amendments or replacement,
The essence not making appropriate technical solution departs from this utility model claim limited range.
Claims (8)
1. a magnetic force negative stiffness multifrequency sound absorption device, it is characterised in that include multiple connected sound absorption unit, described sound absorption unit includes: matrix, vibrating diaphragm, quality sheet and magnetic bar；Described matrix is the housing with cavity and upper surface open, described body upper surface is sealed by described vibrating diaphragm, described quality sheet is positioned over above described vibrating diaphragm, and described magnetic bar is vertically placed in the cavity of described matrix, the height of the adjacent described magnetic bar in sound absorption unit.
Device the most according to claim 1, it is characterised in that the height of the magnetic bar in the plurality of sound absorption unit is periodic arrangement.
Device the most according to claim 1, it is characterised in that described quality sheet is iron plate or ferroalloy sheet.
Device the most according to claim 1, it is characterised in that described magnetic bar is located at the underface of described quality sheet.
Device the most according to claim 1, it is characterised in that close mutually between the plurality of sound absorption unit.
Device the most according to claim 1, it is characterised in that the height maximum of described magnetic bar meets the described magnetic bar when described magnetic bar is vertically placed in described matrix can not hold the condition of described quality sheet just.
Device the most according to claim 1, it is characterised in that described vibrating diaphragm is elastic film.
8. the device as described in any one of claim 1-7, it is characterised in that described quality sheet be shaped as rectangle, hexagon, ellipse；Described magnetic bar is cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620095545.XU CN205487325U (en) | 2016-01-29 | 2016-01-29 | Magnetic force burden rigidity multifrequency sound absorption device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620095545.XU CN205487325U (en) | 2016-01-29 | 2016-01-29 | Magnetic force burden rigidity multifrequency sound absorption device |
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| Publication Number | Publication Date |
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| CN205487325U true CN205487325U (en) | 2016-08-17 |
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| CN201620095545.XU Expired - Fee Related CN205487325U (en) | 2016-01-29 | 2016-01-29 | Magnetic force burden rigidity multifrequency sound absorption device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105551478A (en) * | 2016-01-29 | 2016-05-04 | 北京市劳动保护科学研究所 | Device and method of magnetic force negative stiffness multi-frequency sound absorption |
| 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 |
| CN110428801A (en) * | 2019-07-10 | 2019-11-08 | 北京石油化工学院 | Silencing apparatus for explosion equipment |
| CN111916041A (en) * | 2020-08-13 | 2020-11-10 | 哈尔滨工程大学 | Broadband sound absorption and insulation structure for perforated metamaterial and perforated plate |
-
2016
- 2016-01-29 CN CN201620095545.XU patent/CN205487325U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105551478A (en) * | 2016-01-29 | 2016-05-04 | 北京市劳动保护科学研究所 | Device and method of magnetic force negative stiffness multi-frequency sound absorption |
| CN110428801A (en) * | 2019-07-10 | 2019-11-08 | 北京石油化工学院 | Silencing apparatus for explosion equipment |
| CN110428801B (en) * | 2019-07-10 | 2024-06-04 | 北京石油化工学院 | Muffler device for explosive device |
| 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 |
| CN111916041A (en) * | 2020-08-13 | 2020-11-10 | 哈尔滨工程大学 | Broadband sound absorption and insulation structure for perforated metamaterial and perforated plate |
| CN111916041B (en) * | 2020-08-13 | 2022-08-02 | 哈尔滨工程大学 | Broadband sound absorption and insulation structure for perforated metamaterial and perforated plate |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160817 |
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| CF01 | Termination of patent right due to non-payment of annual fee |