CN109389964A - Low frequency absorption device and its building method - Google Patents
Low frequency absorption device and its building method Download PDFInfo
- Publication number
- CN109389964A CN109389964A CN201710657911.5A CN201710657911A CN109389964A CN 109389964 A CN109389964 A CN 109389964A CN 201710657911 A CN201710657911 A CN 201710657911A CN 109389964 A CN109389964 A CN 109389964A
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- Prior art keywords
- tube body
- low frequency
- absorption device
- elastic tube
- frequency absorption
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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
-
- 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
- G10K11/162—Selection of materials
-
- 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
Abstract
The present invention provides a kind of low frequency absorption device and its building methods, low frequency absorption device of the invention includes the elastic tube body of open at both ends, in being formed with the axially extending opening along the elastic tube body on the side wall of the elastic tube body, further include it is positioned opposite, closed two boards body is carried out with the opening respectively to the elastic tube body both ends.Low frequency absorption device of the present invention is via the setting with opening and elastic tube body closed at both ends, pass through the friction of sound wave and tube wall when use, and the resonance between caused tube body and low-frequency sound wave, the energy of sound wave can be made to be converted to heat to be absorbed, this conversion is especially pronounced when resonating, and this sound absorber can support the resonance mode under low frequency, so as to realize effective absorption to low-frequency sound wave.
Description
Technical field
The present invention relates to sonicated technical field, in particular to a kind of low frequency absorption device absorbed for low-frequency sound wave,
The invention further relates to the building methods of the low frequency absorption device.
Background technique
Low frequency (< 400Hz) sound wave is widely present in life, such as making an uproar of generating of the voice spoken of people and vibration equipment
Sound, therefore to the control of low-frequency sound wave and the important topic in absorption always acoustic engineering.Due to low sound pressure levels (<
Sound system is linear under 120dB), and the dissipation effect between sound wave and material is square directly proportional relative to frequency, therefore
Sound wave is difficult to dissipate in low-frequency range, and the absorption of low-frequency sound wave is to also be always a long standing difficulty.
Since the wave length of sound in air at low frequency is very long (about 1m), traditional sound-absorbing porous material is being supported by wall
Situation also at least needs quarter-wave thickness that can just have significant absorption, this will occupy very big region, in space
It is difficult to endure in limited situation.Meanwhile the scrap of porous material is also very not environmentally, use indoors is both inconvenient, also not
Health.The shortcomings that in order to overcome these traditional materials can not be ignored, people attempt to develop new sub-wavelength low frequency absorption device, example
If embedded film resonating member (DMR) shows impressive absorption at low frequency, but their elastic films for using
It is relatively fragile, and in face of stress or shearing when its stable structure be possible to be destroyed, this to a certain degree on limit its applied field
Scape.
In recent years, it has researched and proposed for resonant structure as open tube resonant cavity, due to its local resonance
Mode can generate the phonon-side bands of deep sub-wavelength at low frequency, and still, up-to-date research also only considered rigid open pipe
Resonant cavity did not studied themselves assimilation effect to sound wave, only studied when they are embedded into porous material pair
The assist gain of wave absorption, to be difficult to put into practical application.
Summary of the invention
In view of this, the invention proposes a kind of low frequency absorption devices, it is intended to overcome in the prior art more insufficient.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of low frequency absorption device comprising:
Elastic tube body, the elasticity tube body open at both ends are formed on the side wall of the elastic tube body along the elasticity
The axially extending opening of tube body；
Plate body, the plate body are positioned opposite two pieces, to respectively constitute the closing to the elastic tube body open at both ends.
Further, the elastic tube body be one or it is nested be arranged it is multiple.
Further, in multiple elastic tube bodies of nested setting, the opening back on the adjacent elastic tube body
To arrangement.
Further, the opening axially penetrates through the elastic tube body along the elastic tube body.
Further, the opening is arranged to be located at the middle section of the elastic tube body axial length.
Further, the elastic tube body has constant or variation cross section along its axial length.
Further, the opening is to have along the axially extending linear of the elastic tube body or the opening along institute
State the bending of elastic tube body circumferential direction.
Further, the cross section of the elastic tube body is ellipse.
Further, it is equipped with rigid backing back to the side in Acoustic Wave Propagation direction in the low frequency absorption device, it is described
Arranged for interval between rigid backing and low frequency absorption device.
Compared with the existing technology, present invention has the advantage that
In low frequency absorption device of the invention, via the setting with opening and elastic tube body closed at both ends, when use, is logical
The resonance between the friction and caused tube body and low-frequency sound wave of sound wave and tube wall is crossed, the energy of sound wave can be made to be converted to heat
It being absorbed, this conversion is especially pronounced when resonating, and this sound absorber can support the resonance mode under low frequency, so as to
Realize effective absorption to low-frequency sound wave.
Meanwhile this sound absorber is not required to setting porous material or elastic film, it thus can be convenient for protection environment and user
Health, and the stability of sound absorber structure will not be destroyed under the shearing force or pressure of some strength, thus but also should
Sound absorber has better practicability.Finally, the structure of this sound absorber designs, and while realizing that low-frequency sound wave absorbs, sound absorption
The general thickness of device also will be greatly reduced compared to the quarter-wave thickness requirement of existing porous material, to can also make
The sound absorber dimensionally has extremely strong competitiveness.
In addition, opening in this sound absorber on adjacent tubes is back to arrangement, can also back to opening between form convolution
Sound wave path, the resonant frequency of sound absorber can be effectively reduced；By the shape and ruler that adjust tube body cross section and opening
Very little, the frequency and absorption maximum of adjustable sound absorber resonance mode are suitable for different application demands；And adjust sound absorber
Contour structures are also beneficial to adapt to the geometry limitation of different application.
Low frequency absorption device as described above of the invention can be to pass through 3D printing or mold injection molding in construction.
Low frequency absorption device of the invention is manufactured by the way of 3D printing or injection molding, can simplify production technology,
And cost is reduced, in favor of the large-scale industrial production of sound absorber.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram (plate body that top is not shown in the figure) of low frequency absorption device described in the embodiment of the present invention；
Fig. 2 is the schematic cross-section of the elastic tube body of ellipse described in the embodiment of the present invention；
Fig. 3 be the embodiment of the present invention described in be disposed with rigid backing low frequency absorption device structural schematic diagram (in figure not
The plate body on top is shown)；
Fig. 4 is that low frequency absorption device described in the embodiment of the present invention uses schematic diagram；
Fig. 5 is that the low frequency absorption device described in the embodiment of the present invention carries out test measurement (circle) and simulation (solid line) obtains
Absorption coefficient；
Fig. 6 is that the low frequency absorption device described in the embodiment of the present invention carries out test measurement (circle) and simulation (solid line) obtains
Reflection coefficient phase；
Description of symbols:
The elastic tube body of 1- first, the elastic tube body of 2- second, 3- opening, 4- plate body, 5- rigidity backing.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
The present embodiment is related to a kind of low frequency absorption device, includes the elastic tube body of open at both ends in structure, in elastic tube
It is also formed with the opening of the long narrow shape of the axially extending arrangement along elastic tube body on the side wall of body, further includes positioned opposite with right
The opening at elastic tube body both ends carries out closed plate body.When work, the low frequency absorption device via have opening and it is closed at both ends
The setting of elastic tube body can make sound by the resonance between the friction and caused tube body and low-frequency sound wave of sound wave and tube wall
The energy of wave is converted to heat and is absorbed, this conversion is especially pronounced when resonating, and this sound absorber can be supported under low frequency
Resonance mode, so as to realize effective absorption to low-frequency sound wave.
Based on overall structure as above, a kind of exemplary structure of the low frequency absorption device of the present embodiment is by Fig. 1 combination Fig. 2 institute
Show, wherein elastic tube body is two of nested setting, and the cross section of elastic tube body is also designed as ellipse, is formed in each
Opening 3 on elastic tube body is located at the middle part of longer sides in the elastic tube body cross section of ellipse, while the opening 3 is along elasticity
The linear for axially penetrating through elastic tube body arrangement of tube body.
Particularly, two of nested arrangement elastic tube bodies are referred to as the first elastic tube in the present embodiment for ease of description
Body 1 and the second elastic tube body 2, the second elastic tube body are located in the first elastic tube body 1, while opening 3 on the second tube body 2 and the
It is designed as between opening 3 on one tube body 1 back to setting, it should be back to arrangement but also the first tube body 1 and the second tube body 2 are being arranged
On show as 180 ° of reversion.
Plate body 4 is closed in the open-mouth in two elastic tube end portions as shown in Figure 1 in the present embodiment, wherein for convenient for
Sound absorber internal structure is shown, and is not illustrated on the plate body 4 on top in Fig. 1.With the elastic tube of ellipse in the present embodiment
Body is expounded the specific structure of the sound absorber, but it should be recognized that in addition to cross section is designed as ellipsoidal structure, when
So other cross sectional shapes, such as round, rectangular, polygon or irregular ring structure can also be used in elasticity tube body.
And it is further, elastic tube body in the sound absorber is designed as two in addition to such as above-mentioned, it also can be only certainly
Closed at both ends one is carried out by plate body 4, or may be alternatively provided as the other quantity nested together such as three, four, for
When other quantity of nested arrangement, opening 3 on adjacent elastic tube body also should using example as illustrated in fig. 1 or fig. 2 back to
Arrangement.
In addition to it is worth noting that, being set in the present embodiment on the cross sectional shape of elastic tube body and its setting quantity
It is each elasticity tube body on opening 3 in addition to be the arrangement that axially penetrates through above-mentioned along elastic tube body, opening 3 can also be setting in elasticity
The middle section of tube body axial length, the cavernous structure in the 3 only interior outsides of perforation elastic tube bodies that are open at this time.The cavernous structure
Opening 3 it is preferred still for along strip structures such as the rectangular opening being axially arranged, elliptical aperture or the slotted holes of elastic tube body, when
So, it in addition to, 3 shape of being open also can be the other forms such as circular hole, square hole, but it can not on sound absorption effect
Together.
In the present embodiment for opening 3, in addition to that can be straight along axially arranging for elastic tube body as described in Figure 1
Linear (rectangular opening, elliptical aperture and the slotted hole of strip structure also can be considered linear) can also make opening 3 in setting
For with the bending along elastic tube body circumferential direction, such as make 3 helical forms etc. that are open.In addition, elastic tube body is being set in the present embodiment
On meter, along its axis direction, the cross section of elastic tube body can be as shown in Figure 2 it is invariable, except of course that invariable
Structure, along the axial direction of elastic tube body, cross-sectional structure may be alternatively provided as (such as cross-sectional area or change in shape of variation
Change), but the variation of elastic tube body cross section can not have an impact the nesting multiple elastic tube bodies.
The low frequency absorption device of the present embodiment can be used 3D printing or thermoplastic materials used to pass through mold injection in construction
Molding, both molding modes all have simple process, advantage low in cost, and the large-scale industry for being conducive to the sound absorber is raw
It produces.Meanwhile the resonant cavity that is constituted of plastic tube body itself also supports the solid resonance mode of low frequency, and sound absorption effect can be improved.
Certainly, in addition to above-mentioned 3D printing and injection molding, which can also be obtained by other machining modes.
The low frequency absorption device of the present embodiment when in use, is absorbed mainly as to the low-frequency sound wave lower than 400Hz,
As shown in Figure 3, to guarantee sound absorption effect when use, in being also equipped with back in the side in Acoustic Wave Propagation direction for sound absorber
The arrangement of rigid backing 5, rigid backing 5 can prevent acoustic wave transmission from propagating, and aluminium sheet or other rigid plates particularly can be used in it
Shape structure, in addition, in setting rigidity backing 5 also should between sound absorber arranged for interval, with rigid backing 5 and sound absorber it
Between formed have one fixed width air gap.
Below in conjunction with specific experiment data and program analogue data to the using effect of the low frequency absorption device of the present embodiment
It is described.
In experiment and when program is simulated, still production sample is illustrated for sound absorber structure shown in Fig. 1,
It is specific as shown in Figure 4, the semi-major axis a of the first of elliptic cross-section the elastic tube body 1 at this time1With semi-minor axis b1Respectively 4.3cm
And 1.2cm, the semi-major axis a of the second elastic tube body 22With semi-minor axis b2Respectively 2.5cm and 0.5cm.The tube wall of two elastic tube bodies
Thickness is 1mm, and the height of two elastic tube bodies is 8.6cm, the opening 3 on the first elastic tube body 1 and the second elastic tube body 2
Width w be 4mm, rigid backing 5 selects aluminium sheet, and the air gap △ L between rigid backing 5 and sound absorber is 2mm, two bullets
Property tube body and plate body 4 closed at both ends be made of 3D printing, the overall thickness of sound absorber sample is 2.9cm.
When experiment, absorption of the sound absorber to sound wave, resistance are measured using four-microphone method in the impedance tube of square cross section
Anti- pipe side length 9.0cm corresponds to plane wave cutoff frequency 1700Hz, and Acoustic Wave Propagation direction is as shown in K in Fig. 4.Experiment is surveyed
The absorption value of the sound absorber obtained is as shown in each circle in Fig. 5, by it can be seen that being 22Hz's in its full width at half maximum (FWHM) (FWHM)
Observe that the ratio with the absorption peak close to very (98.9%), corresponding to relative bandwidth is 6.5% in range.And
The aerial wavelength of sound wave at absorption peak (341Hz) is more than 33 times namely sound absorber of sound absorber sample overall thickness
With a thickness of the 1/33 of wave length of sound, this is small for the thickness of 1/4 wave length of sound needed for existing porous absorbent material
Very much.
The measurement phase of the sound absorber reflection coefficient measured in experiment is as shown in each circle in Fig. 6, by that can see in Fig. 6
Big phase jump (being greater than 120 °) is able to observe that at 341Hz out.
Finite element method for simulating, the suction of analogue simulation are carried out using COMSOL Multiphysics software in the present embodiment
The absorption coefficient and reflection coefficient phase of sound device are respectively as shown in solid in Fig. 5 and Fig. 6, by the observation to Fig. 5 and Fig. 6,
It can be seen that compared with testing measurement there is quantitative consistency between measurement result and analog result.In simulations, exist
There is the simulation peak of 99.5% absorption at 342Hz, this about 98.9% absorption peak very one at 341Hz obtained with measurement
It causes, the phase jump that experiment measurement and simulation obtain is also more consistent, this transition shows the suction that sound absorber resonates to sound wave
It produces effects fruit.
By being tested above as can be seen that the low frequency absorption device of the structure as above of the present embodiment can be realized to low-frequency sound wave
It effectively absorbs, moreover, the sound absorber of the present embodiment is while meeting low-frequency sound wave and effectively absorbing, relative to existing absorptions knot
Structure also has structure size smaller, it is easier to the advantages of arrangement is applied, so that the low frequency absorption device of the present embodiment may make to have
Good practicability.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of low frequency absorption device, characterized by comprising:
Elastic tube body, the elasticity tube body open at both ends, in being formed on the side wall of the elastic tube body along the elastic tube body
Axially extending opening；
Plate body, the plate body are positioned opposite two pieces, to respectively constitute the closing to the elastic tube body open at both ends.
2. low frequency absorption device according to claim 1, it is characterised in that: the elasticity tube body is one or nested setting
It is multiple.
3. low frequency absorption device according to claim 2, it is characterised in that: in multiple elastic tube bodies of nesting setting,
The opening on the adjacent elastic tube body is back to arrangement.
4. low frequency absorption device according to any one of claim 1 to 3, it is characterised in that: the opening is along the elasticity
Tube body axially penetrates through the elastic tube body.
5. low frequency absorption device according to any one of claim 1 to 3, it is characterised in that: the opening is arranged to position
In the middle section of the elastic tube body axial length.
6. low frequency absorption device according to any one of claim 1 to 3, it is characterised in that: the elasticity tube body is along its axis
There is constant or variation cross section to length.
7. low frequency absorption device according to any one of claim 1 to 3, it is characterised in that: the opening is along the bullet
Property the axially extending linear of tube body or the opening there is the bending along the elastic tube body circumferential direction.
8. low frequency absorption device according to any one of claim 1 to 3, it is characterised in that: it is described elasticity tube body it is transversal
Face is ellipse.
9. low frequency absorption device according to any one of claim 1 to 3, it is characterised in that: in the low frequency absorption device
Rigid backing, arranged for interval between the rigidity backing and low frequency absorption device are equipped with back to the side in Acoustic Wave Propagation direction.
10. a kind of building method of low frequency absorption device as described in claim 1, it is characterised in that: the low frequency absorption device is
3D printing or mold injection molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710657911.5A CN109389964A (en) | 2017-08-03 | 2017-08-03 | Low frequency absorption device and its building method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710657911.5A CN109389964A (en) | 2017-08-03 | 2017-08-03 | Low frequency absorption device and its building method |
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| Publication Number | Publication Date |
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| CN109389964A true CN109389964A (en) | 2019-02-26 |
Family
ID=65413117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201710657911.5A Pending CN109389964A (en) | 2017-08-03 | 2017-08-03 | Low frequency absorption device and its building method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110767207A (en) * | 2019-10-30 | 2020-02-07 | 哈尔滨工程大学 | Ultra-thin many absorption peak low frequency sound absorber |
| CN113160785A (en) * | 2020-01-07 | 2021-07-23 | 尤姆弗泰克有限公司 | Device for reducing airborne sound and solid sound |
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| CN102016977A (en) * | 2008-03-03 | 2011-04-13 | 3M创新有限公司 | Process for audible acoustic frequency management in gas flow systems |
| CN102864846A (en) * | 2012-09-04 | 2013-01-09 | 北京科奥克声学技术有限公司 | Metal sound insulation low-frequency acoustical board |
| CN104464711A (en) * | 2014-12-08 | 2015-03-25 | 大连理工大学 | Low-frequency broadband sound-absorbing device with sound-absorbing material units in weakly elastic cascade connection as periodic structure design layers |
| CN106652989A (en) * | 2017-01-18 | 2017-05-10 | 江苏大学 | Mechanical impedance plate composite porous elastic tube sound absorbing structure |
| CN106765678A (en) * | 2017-01-09 | 2017-05-31 | 美的集团股份有限公司 | Silencer and air-conditioning system |
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2017
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102016977A (en) * | 2008-03-03 | 2011-04-13 | 3M创新有限公司 | Process for audible acoustic frequency management in gas flow systems |
| CN102864846A (en) * | 2012-09-04 | 2013-01-09 | 北京科奥克声学技术有限公司 | Metal sound insulation low-frequency acoustical board |
| CN104464711A (en) * | 2014-12-08 | 2015-03-25 | 大连理工大学 | Low-frequency broadband sound-absorbing device with sound-absorbing material units in weakly elastic cascade connection as periodic structure design layers |
| CN106765678A (en) * | 2017-01-09 | 2017-05-31 | 美的集团股份有限公司 | Silencer and air-conditioning system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110767207A (en) * | 2019-10-30 | 2020-02-07 | 哈尔滨工程大学 | Ultra-thin many absorption peak low frequency sound absorber |
| CN110767207B (en) * | 2019-10-30 | 2023-09-29 | 哈尔滨工程大学 | Ultrathin multi-absorption peak low-frequency sound absorber |
| CN113160785A (en) * | 2020-01-07 | 2021-07-23 | 尤姆弗泰克有限公司 | Device for reducing airborne sound and solid sound |
| CN113160785B (en) * | 2020-01-07 | 2024-02-23 | 尤姆弗泰克有限公司 | Device for reducing air and solid sound transmission |
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