CN207989104U - A kind of dynamic sound-absorbing muffler of magnetic rheology elastic body active - Google Patents
A kind of dynamic sound-absorbing muffler of magnetic rheology elastic body active Download PDFInfo
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- CN207989104U CN207989104U CN201820455709.4U CN201820455709U CN207989104U CN 207989104 U CN207989104 U CN 207989104U CN 201820455709 U CN201820455709 U CN 201820455709U CN 207989104 U CN207989104 U CN 207989104U
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Abstract
The utility model discloses a kind of magnetic rheology elastic body actives to move sound-absorbing muffler, including cylinder, and cylinder is equipped with air inlet pipe and an air outlet pipe, and cylinder is interior to be divided into three cavitys equipped with two pieces of partition boards, and recirculation hole is provided on two pieces of partition boards；The fixing axle coaxial with cylinder is equipped in intermediate cavity, at least two pieces of magnetic conductive boards are arranged in fixing axle, magnetic rheology elastic body is equipped between two pieces of adjacent magnetic conductive boards, coil is equipped between magnetic rheology elastic body and fixing axle, there are circulation passages between magnetic conductive board and magnetic rheology elastic body and cylinder inboard wall.The utility model has the advantages that：The magnetic field size in size of current control coil is adjusted by coil, the field for changing magnetic rheology elastic body causes micro-structure, it can change according to incident acoustic wave frequency and adjust its acoustic absorptivity harmony impedance magnitude, realize that acoustic impedance is adjustable, noise rubs in viscosity and is efficiently absorbed under relaxation, therefore acoustical absorptivity is strong, reliability is high；Acoustic impedance size and acoustic absorptivity are adjustable, therefore acoustic frequency bandwidth, and acoustic impedance variable range is big.
Description
Technical field
The utility model is related to sound absorption technique fields, and in particular to a kind of dynamic sound-absorbing muffler of magnetic rheology elastic body active.
Background technology
As the improvement of people's living standards, people especially propose more automobile noise the comfort of running car
High requirement.The reduction inevitable requirement more quiet engine of vehicle running noise standard limit is arranged in automobile engine noise
Gas noise accounts for about the 30% of overall noise, is most important noise source, higher 10dB~15dB than other noises.Muffler is mounted in
Critical component on generator gas channel is the most effective noise reduction means for controlling exhaust noise and generally using.Traditional
It is preferable to the effect of narrow-band noise in passive silencer, wide band noise elimination requirement cannot be met, and passive silencing apparatus is deposited
In the shortcomings of complicated, low frequency noise reduction is poor, size is bigger than normal.Therefore, there has been proposed the methods that active is eliminated the noise, actively
The control targe of noise elimination is usually that regional area acoustic energy is made to reduce, and to achieve the purpose that noise elimination noise reduction, but this method is de-
From noise source main body, inevitably it is suppressed the part that some in sound source need.Therefore, the thought of Active Absorption causes scholars
Great interest, this method are controlled from noise transmission approach and by sound body, and target is to make the reflection system of incident acoustic wave
It counts very little or close to zero, forms " black hole " phenomenon so that acoustic absorptivity reaches maximum, to achieve the purpose that sqouynd absorption lowering noise.
Compared with traditional sound absorption technique, Active Absorption can be such that sound absorption effect changes with the variation of sound source characteristic, realize intelligence, master
Noise is controlled dynamicly.Currently, Active Absorption method mainly has based on impedance matching, based on piezoelectric material and based on metal-rubber material
The active sound-absorbing method of material, but these active sound-absorbing methods also have its respective limitation and are difficult to promote the use of, and reason is：
1. the sound-absorbing method based on impedance matching is good to the effect of low frequency and high-frequency effect is poor；2. passing through piezoelectric effect using piezoelectric material
Energy consumption improves acoustic absorptivity, but the acoustic pressure of general sound wave and is sufficiently large to cause sound-absorbing material bending vibration, leads to active suction
Sound system sound absorption effect in low frequency is undesirable；3. metal rubber material is larger by static flow resistivity itself, therefore sound absorption effect is not
Stablize.
Invention content
The purpose of this utility model is to provide a kind of magnetic rheology elastic body actives to move sound-absorbing muffler, can effectively solve the problem that existing
The problem for having muffler sound absorption effect undesirable.
In order to solve the above-mentioned technical problem, the utility model is achieved through the following technical solutions：A kind of magnetorheological bullet
Property body Active Absorption muffler, including cylinder are respectively equipped with air inlet pipe and an air outlet pipe, in the cylinder along the both ends of tubular axis
Cylinder is divided into the first cavity, the second cavity and third cavity, the air inlet along vertical tubular axis direction by two pieces of partition boards
Pipe is communicated with the first cavity, and the escape pipe is communicated with third cavity, and recirculation hole is provided on two pieces of partition boards；
It is equipped with the fixing axle coaxial with cylinder in second cavity, at least two pieces of magnetic conductions are arranged in the fixing axle
Plate is equipped with magnetic rheology elastic body between adjacent two pieces of magnetic conductive boards, and coil is equipped between magnetic rheology elastic body and fixing axle, described
There are circulation passages between magnetic conductive board and magnetic rheology elastic body and cylinder inboard wall.
Preferably, the cylinder is by including outer wall, magnetic rheology elastic body and perforated plate successively within outer, on the perforated plate
It is provided with several stomatas.
Preferably, 30% of the stomata occupied area not less than perforation plate suqare.
Preferably, be provided at least six recirculation holes on every piece of partition board, the recirculation hole be evenly distributed on it is described every
On plate.
Preferably, the both ends of the fixing axle are separately fixed on two pieces of partition boards.
Preferably, the air inlet pipe is extend into the first cavity, and the escape pipe is also extend into third cavity.
Compared with prior art, the utility model has the advantages that：It is adjusted in size of current control coil and is generated by coil
Magnetic field size, the field to change setting magnetic rheology elastic body in the second cavity causes micro-structure, and then changes its mechanical property,
And the change of its mechanical property will cause acoustic impedance and acoustic absorptivity to change, therefore can change according to incident acoustic wave frequency and adjust
Its acoustic absorptivity harmony impedance magnitude realizes that acoustic impedance is adjustable；Magnetic rheology elastic body low-frequency range acoustic absorptivity with electric current increase and
Increase, and acoustic absorptivity reaches peak value when size of current reaches a certain value；When incident acoustic wave frequency and magnetic rheology elastic body are solid
Have frequency it is same or similar when both resonate, peak value will occur in sound energy loss amount, to improve whole sound absorbing performance.
Therefore, noise rubs in viscosity and is efficiently absorbed under relaxation, therefore acoustical absorptivity is strong, and reliability is high；
Acoustic impedance size and acoustic absorptivity are adjustable, therefore acoustic frequency bandwidth, and acoustic impedance variable range is big.
The cylinder is by including successively outer wall, magnetic rheology elastic body and perforated plate within outer, if being provided on the perforated plate
Dry gas hole, the sound wave reflected by partition board, is consumed with magnetic rheology elastic body collective effect sorption enhanced for thermal energy by perforated plate,
Improve performance muffler.
The stomata occupied area ensures the magnetic rheology elastic body for having perforated plate rear not less than the 30% of perforation plate suqare
Enough effects can be played, stomata accounting is very few, and magnetic rheology elastic body will be unable to play maximum efficiency.
At least six recirculation holes are provided on every piece of partition board, the recirculation hole is evenly distributed on the partition board.Every
The recirculation hole opened on plate can allow sound wave normally to propagate in cylinder and gradually be absorbed.
The both ends of the fixing axle are separately fixed on two pieces of partition boards, are allowed what fixing axle can stablize to fix, are not easy
It shakes and influences erasure effect.
The air inlet pipe is extend into the first cavity, and the escape pipe also extend into third cavity and allows, and sound is in cylinder
It is inside not easy to escape out from air inlet pipe or escape pipe, carries out multiple reflections and absorbed.
Description of the drawings
Fig. 1 is the structural schematic diagram that a kind of magnetic rheology elastic body active of the utility model moves sound-absorbing muffler；
Fig. 2 is magnetic rheology elastic body elasticity modulus and magnetic field intensity graph of relation in the utility model；
Fig. 3 is acoustic absorptivity and sound wave incident frequency relation curve figure in the utility model.
Specific implementation mode
Refering to fig. 1, Fig. 2, Fig. 3 be a kind of magnetic rheology elastic body active of the utility model move sound-absorbing muffler embodiment, one
Kind magnetic rheology elastic body active moves sound-absorbing muffler, including cylinder, and air inlet pipe 1 and escape pipe are respectively equipped with along the both ends of tubular axis
8, the cylinder is interior to be divided into the first cavity 15,13 and of the second cavity along vertical tubular axis direction by two pieces of partition boards 10 by cylinder
Third cavity 9, the air inlet pipe 1 are communicated with the first cavity 15, and the escape pipe 8 is communicated with third cavity 9, on two pieces of partition boards 10
It is provided with recirculation hole 14；
The fixing axle 7 coaxial with cylinder is equipped in second cavity 13, being arranged at least two pieces in the fixing axle 7 leads
Magnetic sheet 12 is equipped with magnetic rheology elastic body 11 between adjacent two pieces of magnetic conductive boards 12, is set between magnetic rheology elastic body 11 and fixing axle 7
There is coil 6, there are circulation passages 16 between the magnetic conductive board 12 and magnetic rheology elastic body 11 and cylinder inboard wall.
The magnetic field size generated in size of current control coil 6 is adjusted by coil 6, is set to change in the second cavity 13
Set magnetic rheology elastic body 11 field cause micro-structure, and then and change its mechanical property, and its mechanical property change will lead to acoustic resistance
Anti- and acoustic absorptivity changes, therefore can change according to incident acoustic wave frequency and adjust its acoustic absorptivity harmony impedance magnitude, real
Existing acoustic impedance is adjustable；3 low-frequency range acoustic absorptivity of magnetic rheology elastic body increases with electric current and is increased, and reaches a certain in size of current
Acoustic absorptivity reaches peak value when value；The hair both when incident acoustic wave frequency and 3 intrinsic frequency of magnetic rheology elastic body are same or similar
Raw resonance, peak value will occur in sound energy loss amount, to improve whole sound absorbing performance.
Further, the cylinder includes outer wall 2, magnetic rheology elastic body 3 and perforated plate 4, the perforation successively from outside to inside
Several stomatas 5 are provided on plate 4, the sound wave reflected by partition board 10 is absorbed by perforated plate 4 and 3 collective effect of magnetic rheology elastic body
It is converted into thermal energy and consumes, improve performance muffler.
Further, 5 occupied area of the stomata is not less than the 30% of 4 area of perforated plate, ensures the magnetic for having 4 rear of perforated plate
Magnetorheological elastomer 3 can play enough effects, and 5 accounting of stomata is very few, and magnetic rheology elastic body 3 will be unable to play maximum efficiency.
Further, at least six recirculation holes 14 are provided on every piece of partition board 10, the recirculation hole 14 is evenly distributed on
On the partition board 10.The recirculation hole 14 opened on partition board 10, can allow sound wave normally to propagate in cylinder and gradually be absorbed.
Further, the both ends of the fixing axle 7 are separately fixed on two pieces of partition boards 10, and fixing axle 7 can be stablized
It fixes, is not easy to shake and influence erasure effect.
Further, the air inlet pipe 1 is extend into the first cavity 15, and the escape pipe 8 is also extend into third cavity 9,
It allows sound to be not easy to escape out from air inlet pipe 1 or escape pipe 8 in cylinder, carries out multiple reflections and absorbed.
The magnetic rheology elastic body 3 be one kind under magnetic fields its elasticity modulus can with applied field strengths change and
The material of variation has many characteristics, such as that controllability, invertibity, response are rapid；Its microstructure is logical to be formed along additional field direction
The fields such as chain, branch, Isolated Chains and beam chain cause micro-structure, the variation of this microstructure to cause the huge change of macromechanics behavior
Change.Using the above-mentioned characteristic of magnetic rheology elastic body 3, by adjusting size of current in coil 6, and then generated in control coil 6
Magnetic field size, the field to change magnetic rheology elastic body 3 cause micro-structure, the final regulation and control realized to sound absorbing performance.
Magnetic-particle of the magnetic rheology elastic body 3 in matrix forms chain structure under magnetic fields, when sound wave enters noise reduction
When device pipeline, caused in 3 chain structure of magnetic rheology elastic body inside viscosity resistance, chain structure between chain and chain by acoustic vibration
Impact force and frictional force, chain structure end and muffler the cylinder frictional force caused by wall effect etc. change therewith, sound
Thermal energy can be converted mainly into be dissipated, and due to the irregular arrangement between each chain structure, each chain air gap periphery is divided into
Some finer holes of cloth, such structure more effectively increase Air mycetes in hole so that incident acoustic wave energy quilt
More effectively absorb；Secondly the matrix of magnetic rheology elastic body 3 is high molecular polymerization composition granule, and internal damping is larger, and there are elastic relaxations
Henan effect sound absorption, under sound wave effect, granular materials deforms upon, and acoustic energy is changed by the elastic relaxation effect of material itself
Thermal energy and be lost, therefore noise rub in viscosity and relaxation effect collective effect under sound absorbing power it is stronger.
In above process, magnetic rheology elastic body 3 can be big by adjusting 6 size of current of coil change magnetic field in muffler
It is small, and then and change its mechanical property, and the change of its mechanical property will cause acoustic impedance and acoustic absorptivity to change, therefore can
Its acoustic absorptivity harmony impedance magnitude is adjusted according to the variation of incident acoustic wave frequency, realizes that acoustic impedance is adjustable；Magnetic rheology elastic body 3 is low
Frequency range acoustic absorptivity increases with electric current and is increased, and acoustic absorptivity reaches peak value when size of current reaches a certain value；Work as incidence
It resonating both when frequency of sound wave and same or similar 3 intrinsic frequency of magnetic rheology elastic body, peak value will occur in sound energy loss amount,
To improve whole sound absorbing performance.
When sound wave enters the first cavity 15 by air inlet pipe 1, most of sound wave passes through the circulation on partition board 10 and partition board 10
Channel 16 enters the second cavity 13, common by perforated plate 4 and magnetic rheology elastic body 3 after small part sound wave is reflected by partition board 10
Effect sorption enhanced consumes for thermal energy；Sound wave into the second cavity 13 is mainly " black in the formation of 3 surface of magnetic rheology elastic body
Hole " effect, leads to multiple reflections, repeatedly absorbs so that acoustic absorptivity reaches maximum, and fraction passes through perforated plate 4 and magnetic current
Become the sound absorption of 3 collective effect of elastomer；Sound wave enters third cavity from the second cavity 13 by circulation passage 16 and across partition board 10
9, at this time only remain a small amount of noise, can perforated plate 4 with sorption enhanced disappears for thermal energy again under 3 collective effect of magnetic rheology elastic body
Consumption.Clearly for the muffler of the utility model, when electric current increase makes acoustic impedance and acoustic absorptivity increase, the frequency of incident acoustic wave
Bandwidth is consequently increased, and has effectively expanded the frequency bandwidth of the incident acoustic wave of system, therefore controllability is strong, adjustable sound-absorbing frequency band
Width, acoustic impedance variable range are big.
The perforated plate 4 is combined with 3 material of magnetic rheology elastic body, can widen sound sucting band, and 3 energy of magnetic rheology elastic body
The vibrational energy for enough reducing muffler, up to the purpose up to damping shock absorption and sound absorption.
The foregoing is merely specific embodiment of the utility model, but the technical characteristics of the utility model is not limited to
This, any those skilled in the art in the field of the utility model, made by changes or modifications all cover it is new in this practicality
Among the scope of the claims of type.
Claims (1)
1. a kind of magnetic rheology elastic body active moves sound-absorbing muffler, it is characterised in that：Including cylinder, distinguish along the both ends of tubular axis
Equipped with air inlet pipe (1) and escape pipe (8), cylinder is separated along vertical tubular axis direction by two pieces of partition boards (10) in the cylinder
For the first cavity (15), the second cavity (13) and third cavity (9), the air inlet pipe (1) communicates with the first cavity (15), described
Escape pipe (8) is communicated with third cavity (9), and recirculation hole (14) is provided on two pieces of partition boards (10)；In second cavity (13)
Equipped with the fixing axle (7) coaxial with cylinder, the both ends of the fixing axle (7) are separately fixed on two pieces of partition boards (10), institute
It states and is arranged at least two pieces of magnetic conductive boards (12) in fixing axle (7), magnetorheological elasticity is equipped between adjacent two pieces of magnetic conductive boards (12)
Body (11) is equipped with coil (6), the magnetic conductive board (12) and magnetorheological elasticity between magnetic rheology elastic body (11) and fixing axle (7)
There are circulation passage (16) between cylinder inboard wall for body (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820455709.4U CN207989104U (en) | 2018-03-19 | 2018-03-19 | A kind of dynamic sound-absorbing muffler of magnetic rheology elastic body active |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820455709.4U CN207989104U (en) | 2018-03-19 | 2018-03-19 | A kind of dynamic sound-absorbing muffler of magnetic rheology elastic body active |
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| Publication Number | Publication Date |
|---|---|
| CN207989104U true CN207989104U (en) | 2018-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820455709.4U Expired - Fee Related CN207989104U (en) | 2018-03-19 | 2018-03-19 | A kind of dynamic sound-absorbing muffler of magnetic rheology elastic body active |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108252768A (en) * | 2018-03-19 | 2018-07-06 | 浙江师范大学 | A kind of magnetic rheology elastic body active moves sound-absorbing muffler |
| CN110318348A (en) * | 2019-07-12 | 2019-10-11 | 中铁四局集团第五工程有限公司 | A kind of sound barrier using bladder-type magnetic rheology elastic body |
-
2018
- 2018-03-19 CN CN201820455709.4U patent/CN207989104U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108252768A (en) * | 2018-03-19 | 2018-07-06 | 浙江师范大学 | A kind of magnetic rheology elastic body active moves sound-absorbing muffler |
| CN110318348A (en) * | 2019-07-12 | 2019-10-11 | 中铁四局集团第五工程有限公司 | A kind of sound barrier using bladder-type magnetic rheology elastic body |
| CN110318348B (en) * | 2019-07-12 | 2021-02-09 | 中铁四局集团第五工程有限公司 | Sound barrier applying air bag type magnetorheological elastomer |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181019 |
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| CF01 | Termination of patent right due to non-payment of annual fee |