CN208157053U - A kind of compound superstructure of abnormal shape funnel acoustics Helmholz resonance - Google Patents
A kind of compound superstructure of abnormal shape funnel acoustics Helmholz resonance Download PDFInfo
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- CN208157053U CN208157053U CN201820403253.7U CN201820403253U CN208157053U CN 208157053 U CN208157053 U CN 208157053U CN 201820403253 U CN201820403253 U CN 201820403253U CN 208157053 U CN208157053 U CN 208157053U
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Abstract
The utility model discloses a kind of compound superstructures of special-shaped funnel acoustics Helmholz resonance, including a uniform inner tube, one special-shaped funnel shaped variable cross section pipe surrounded along outer wall of inner tube, with the inlet tube of an annular cover plate and a connection annular cover plate at the top of varying cross-section duct, the special-shaped compound superstructure of funnel cavity resonance that circular hole is opened at a both ends is formed.Its cell cube of the utility model is a compound special-shaped funnel structure, can be used as two resonator works simultaneously, wherein the first resonance comes from Helmholz resonance chamber, the second resonance comes from extension tube resonant cavity.Therefore the structure has powerful multiband resonances characteristic, when the sound wave of corresponding frequency band enters, it can be resonated by multiple resonators and generate negative effective mass density, so that generating band gap prevents sonic transmissions, achieve the effect that control noise, while extension tube ensure that gas can normally circulate.
Description
Technical field
The utility model belongs to duct acoustics field of noise control, and in particular to a kind of abnormal shape funnel acoustics Helmholtz is total
It shakes compound superstructure design method.
Background technique
The acoustical behavior of one product is an important factor for influencing consumer's selection and satisfaction.In general, in order to reduce sky
The noise of the electric appliances such as tune, dust catcher, refrigerator, we will use the passive Noises control such as viscous-elastic material, porous foam or silencer
Method processed.But the requirement with consumer to the mute performance of electric appliance is continuously improved, these conventional methods are no longer satisfied people
Demand.Especially to the electric appliance for needing gas to circulate inside air-conditioning, refrigerator etc., gas cannot be hindered while reducing noise
Body circulation, influences properties of product.Therefore we need a kind of method of innovation, effective under the premise of not influencing properties of product
Reduce noise.
It can be used to solve this problem by the acoustic metamaterial of artificial cycle structure composition.Acoustic metamaterial has very much
Special nature not available for traditional material, such as negative equivalent mass density and negative concrete moduli, can effectively control sound wave.
2006, the Fang in University of Illinois of U.S. champagne branch school etc. utilized heimholtz resonator one-dimensional array, realized negative etc.
Modulus is imitated, to effectively decay to sound wave；2008, Yang etc. produced the super material of film-type equivalent negative mass density
Material, the film metamaterial can form equivalent negative mass density in the frequency range of 200~300Hz.When sound wave is perpendicular to thin
When membrane plane incidence, as long as the resonant frequency of incident frequencies and mass block on film matches, it will be able to so that sound wave is complete
Total reflection, and cannot penetrate.Although these Meta Materials can efficiently control noise, their structure can hinder gas
Circulation, so cannot be used in the system with motor and compressor.
In traditional technology applied to low frequency duct attenuation, the resistances such as Helmholtz silencer and expansion muffler pipe
Silencer Technical comparing is mature, when being excited by a certain specific frequency sound wave, can consume energy by the vibration of resonant cavity, because
This these technology can only control single specific frequency noise.
And negative equivalent mass density Meta Materials such as film-type Meta Materials and local resonance type Meta Materials in acoustic metamaterial
Although having preferable sound insulation and working frequency, its most of structure does not allow air-flow to pass through, therefore can not be applied to exist
In the pipeline of air-flow.
Utility model content
The utility model in view of the above technology on deficiency, propose that a kind of special-shaped funnel acoustics Helmholz resonance is compound super
Structure, the structure combine Helmholtz silencer and expansion muffler pipe, cause to bear effect by multi-resmator resonance
Mass density realizes effectively sound insulation so that forming band gap on multiband prevents sonic transmissions.The utility model is unique simultaneously
Design is smaller to gas-flow resistance, can guarantee gas circulation while effective sound insulation.
The utility model is realized by following technical proposals.
A kind of compound superstructure of special-shaped funnel acoustics Helmholz resonance of the utility model, including a uniform inner tube,
One special-shaped funnel shaped variable cross section pipe surrounded along outer wall of inner tube and an annular cover plate at the top of varying cross-section duct and one
The inlet tube for connecting annular cover plate, forms the special-shaped compound superstructure of funnel cavity resonance that circular hole is opened at a both ends.
In above-mentioned technical proposal, scheme that the utility model also further limits：
Further, the caliber of the inlet tube is greater than the caliber of inner tube, and inner tube extends to entrance from varying cross-section duct inner cavity
In pipe.
Further, the distance between said inner tube top and annular cover plate lower end surface are the length of Helmholz resonance chamber neck
Spend Lh；The distance of inner tube low side to annular cover plate lower end surface is the length L of extension tube resonant cavityp；The Helmholz resonance chamber neck
The length L in portionhWith the length L of extension tube resonant cavitypThe ratio between be 0.01~0.05.
Further, inlet tube caliber d1With inner tube diameter d3The ratio between be 1.25~3.
Further, said inner tube, special-shaped funnel shaped variable cross section pipe are identical with the thickness of annular cover plate, are 0.5mm~5mm.
Further, the compound superstructure material of resonance is plastics, metal or wood materials.
Compared with prior art, the utility model has the beneficial effects that：
1) the special-shaped compound superstructure of funnel acoustics Helmholz resonance described in the utility model can be used as Helmholtz simultaneously
Resonator and extension lumen resonator, are resonated by multiple resonators and generate negative effective mass density, to form band gap prevention
Acoustic Wave Propagation, therefore higher oise insulation factor can be realized in multiple broadbands.
2) the special-shaped compound superstructure of funnel acoustics Helmholz resonance described in the utility model effectively insulates against sound same in realization
When, it will not influence gas circulation, can be widely applied to various ventilation pipes and louver(-vre) etc..
3) material therefor impact resistance, heat resistance, lower temperature resistance, chemical resistance and excellent electrical properties, also have
The features such as easy processing, product size are stable, lustrous surface is good is easy coating, coloring, can also carry out surface metallization,
The secondary operation such as plating, welding, hot pressing and bonding, have further widened the application range of this structure in practical projects.
4) cell cube is made of homogenous material, and structure is simple.It can directly be prepared with 3D printing, it is also possible to mold processing, work
Skill is simple, equipment investment cost is low, facilitates and is mass produced.
Detailed description of the invention
Attached drawing described herein is used to provide a further understanding of the present invention, and is constituted part of this application,
It does not constitute improper limits to the present invention, in the accompanying drawings：
Fig. 1 is the compound superstructure cell body symmetrical profile figure of special-shaped funnel acoustics Helmholz resonance of the utility model；
Fig. 2 is the utility model cell cube schematic diagram and parameter；
Fig. 3 is the three-dimensional structure diagram of the utility model embodiment cell cube；
Fig. 4 is the sectional view of the utility model embodiment cell cube；
Fig. 5 is the sound insulation curve graph (1) of the utility model embodiment；
Fig. 6 is the sound insulation curve graph (2) of the utility model embodiment.
In figure：1, inner tube；2, varying cross-section duct lower section；3, varying cross-section duct upper section；4, annular cover plate；5, inlet tube.
Specific embodiment
The utility model is described in detail below in conjunction with attached drawing and specific embodiment, in the signal of this utility model
Property embodiment and explanation be used to explain the utility model, but be not intended to limit the scope of the present invention.
As shown in Figure 3,4, the compound superstructure of a kind of special-shaped funnel acoustics Helmholz resonance, including a uniform inner tube
1, a special-shaped funnel shaped variable cross section pipe surrounded along 1 outer wall of inner tube, varying cross-section duct includes varying cross-section duct lower section 2 and varying cross-section duct
The inlet tube 5 of upper section 3 and an annular cover plate 4 and a connection annular cover plate at the top of varying cross-section duct, forms one two
Open the special-shaped compound superstructure of funnel cavity resonance of circular hole in end.Wherein, the caliber of inlet tube is greater than the caliber of inner tube, and inner tube is certainly
Varying cross-section duct inner cavity extends in inlet tube.
As shown in Figure 1, for the compound superstructure cell body symmetrical profile figure of special-shaped funnel acoustics Helmholz resonance, wherein
Chain-dotted line is symmetry axis, and part A and E are partly parallel to symmetry axis, therefore can respectively obtain slightly uniformly around 360 ° of symmetry axis rotations
Round tube and thin uniform round tube, i.e. inlet tube and inner tube；Part B obtains ring cover perpendicular to symmetry axis, around 360 ° of rotations of symmetry axis
Plate；C and D is circular arc of the center of circle on symmetry axis, and the center of circle is respectively O1And O2, C portion arc radius is greater than the part D, C and D two
Part connection is rotated by 360 ° to obtain special-shaped funnel shaped variable cross section pipe around symmetry axis.Each section connection relationship is as shown in the figure.
Fig. 2 is the sectional view and important parameter mark of cell cube.D as shown in the figure1It for the internal diameter of inlet tube, while being also ring
The aperture of shape cover board, value range are 10mm~15mm, and inlet tube is the entrance of gas and sound wave.d2For annular cover plate
Outer annular diameter, while being also the outer diameter of the upper end of special-shaped funnel shaped variable cross section pipe, value range is 17mm~35mm.d3It is interior
The internal diameter of pipe, value range are 5mm~8mm.LiFor insertion upper end of inner tube to entrance distance.LhAnnular is higher by for inner tube
The height of cover board lower end surface and the length of Helmholz resonance chamber neck, value range are 0.5mm~5mm.LpIt is then interior
Pipe lower end to annular cover plate distance, while be also extension lumen resonator length, Lh+LpThe as length of inner tube.VhIt is conspicuous
The volume of Mu Huozi resonant cavity.
For two circular arcs in special-shaped funnel shaped variable cross section pipe, the outer diameter of upper circular arc depends on the outer diameter of annular cover plate,
And the outer diameter of lower circular arc then depends on the outer diameter and radian of circular arc, lower end is connect with inner tube.
The utility model is a kind of compound superstructure of special-shaped funnel acoustics Helmholz resonance, and cell cube is one compound different
Type funnel structure can be used as two resonator works simultaneously, wherein the first resonance comes from Helmholz resonance chamber (HR), second is humorous
Vibration comes from extension tube resonant cavity (EPCR).Therefore the structure has powerful multiband resonances characteristic, when the sound wave of corresponding frequency band
Into when, can by multiple resonators resonate generate negative effective mass density, thus generate band gap prevent sonic transmissions, reach
The effect of noise is controlled, while extension tube ensure that gas can normally circulate.
Gas and sound wave enter in cell cube from inlet tube one end, sound wave wherein by resonance dissipate and a plurality of band gap every
Sound, finally only small part acoustic energy can spread out of cell cube, and gas then can be largely smoothly discharged by inner tube.
The internal diameter of inlet tube and the internal diameter of annular cover plate mesoporous are d1, the outer diameter of annular cover plate and special-shaped funnel-form change are cut
The outer diameter of facial canal upper end is d2, therefore three can closely connect to form a special-shaped funnel cavity structure.Special-shaped funnel-form
The internal diameter of varying cross-section duct lower end and the outer diameter of inner tube are d3, therefore inner tube can be closely embedded in special-shaped funnel cavity structure.
The upper surface of the inner tube of embedded part is higher than the lower end surface of annular cover plate, and the length of the raised area is Lh, i.e. Helmholz resonance
The length of the neck of chamber.The inner surface encirclement shape of the outer surface of inner tube and inlet tube, annular cover plate, special-shaped funnel shaped variable cross section pipe
At Helmholz resonance chamber, volume Vh.Inner tube is extension lumen, length L lower than the part of annular cover platep.In cell cube
The thickness of uniform round tube, special-shaped funnel shaped variable cross section pipe and annular cover plate is equal, in one embodiment, with a thickness of 0.5mm
~5mm.
Each section material is ABS plastic in the cell cube of the utility model, other rigid materials can also be used.The unit
Body can be used alone, and periodic arrangement can also form two-dimensionally periodic structure on plane framework.
According to our theory deduction and simulation result, the variation of parameter can have an important influence on the performance of cell cube：
1. in the case where cell cube overall thickness is constant, between the neck and extension lumen resonator of Helmholz resonance chamber
Width of the length than will affect band gap.According to our calculating and simulation result, smaller length ratio will lead to be formed more
Wide band gap.That is the length L of Helmholz resonance chamber neckhWith the length L of extension tube resonant cavitypIt is 0.01~0.05.
2. neck length is directly proportional to the acoustic mass of Helmholz resonance chamber, and lesser acoustic mass is conducive to widen band
Gap.
3. the reduction of neck length can improve the first resonant frequency.
4. in the case where extension lumen resonator parameter determines, the cross-sectional area of Helmholz resonance chamber neck and extension
The variation of ratio, will lead to the variation of resonant frequency between lumen resonator cross-sectional area.Ratio reduction can reduce sticky damage
It loses, reduce resonant frequency and broadening band gap.That is inlet tube caliber d1With inner tube diameter d3The ratio between be 1.25~3.
5. longer EPCR length can produce broader in the case where the resonant frequency of Helmholz resonance chamber determines
Band gap.
6. the volume of Helmholz resonance chamber is bigger, band gap quantity is more.
Comprehensively consider factors above：In order to make the band gap of the special-shaped compound superstructure of funnel acoustics Helmholz resonance proposed
It maximizes, lesser Helmholz resonance chamber neck length and neck area should be selected in parameter selection, select longer
Extension lumen resonator length make Helmholz resonance chamber in the case where meeting other conditions and meeting actual requirement
Volume is as big as possible.
Specifically, our embodiment parameters for selecting for：d1=14mm, d2=34mm, d3=6mm, Li=9.5mm, Lh=
0.5mm, Lp=39.5mm, in two arc surfaces, the radius of upper cambered surface is 17mm, and the radian for corresponding to camber line is 45 °, then descends arc
The radius in face isThe thickness of uniform round tube, special-shaped funnel shaped variable cross section pipe and annular cover plate is 0.5mm.
Fig. 5 and Fig. 6 is the oise insulation factor curve graph that embodiment comsol emulation experiment obtains.As shown in figure 5, selected implementation
Example can realize the sound insulation of 20dB or more in the broadband of 1442Hz~1517Hz, occur a sound insulation peak, peak at 1498Hz
Value oise insulation factor reaches 115dB.As shown in fig. 6, selected embodiment can realize 20dB or more in the wideband of 1944Hz~3338Hz
Sound insulation, and occur a sound insulation peak at 2530Hz, peak value oise insulation factor reaches 165dB, almost sound insulation completely.
The specific preparation process of the utility model is as follows：
1) it according to actual needs, is carried out using parameter of the simulation analysis softwares such as comsol to the utility model structure excellent
Change, obtains optimal structural parameters.
2) according to obtained optimum structure parameter, the three-dimensional of optimum structure is drawn using the 3D such as solidworks mapping software
Model simultaneously exports as the format that suitable 3D printer uses.
3) suitable 3D printer is selected according to the size of threedimensional model and required precision, designed threedimensional model is led
Enter in 3D printer and printed, and carry out subsequent processing after the completion of printing, obtains designed structure.
Since the utility model structure is simple, it can also be used mold into large-scale production.
The utility model is not limited to above-described embodiment, on the basis of technical solution disclosed by the utility model, this
For the technical staff in field according to disclosed technology contents, not needing creative labor can be special to some of which technology
Sign makes some replacements and deformation, these replacements and deformation are within the protection scope of the present utility model.
Claims (6)
1. a kind of compound superstructure of abnormal shape funnel acoustics Helmholz resonance, it is characterised in that：Including uniform an inner tube, one
A special-shaped funnel shaped variable cross section pipe and an annular cover plate and a company at the top of varying cross-section duct surrounded along outer wall of inner tube
The inlet tube for connecing annular cover plate forms the special-shaped compound superstructure of funnel cavity resonance that circular hole is opened at a both ends.
2. a kind of compound superstructure of special-shaped funnel acoustics Helmholz resonance according to claim 1, it is characterised in that：Institute
The caliber for stating inlet tube is greater than the caliber of inner tube, and inner tube extends in inlet tube from varying cross-section duct inner cavity.
3. a kind of compound superstructure of special-shaped funnel acoustics Helmholz resonance according to claim 1, it is characterised in that：Institute
State the length L that the distance between inner tube top and annular cover plate lower end surface are Helmholz resonance chamber neckh；Inner tube low side is to ring
The distance of shape cover board lower end surface is the length L of extension tube resonant cavityp；The length L of the Helmholz resonance chamber neckhWith extension
The length L of pipe resonant cavitypThe ratio between be 0.01~0.05.
4. a kind of compound superstructure of special-shaped funnel acoustics Helmholz resonance according to claim 1, it is characterised in that：Enter
Mouth pipe caliber d1With inner tube diameter d3The ratio between be 1.25~3.
5. a kind of compound superstructure of special-shaped funnel acoustics Helmholz resonance according to claim 1, it is characterised in that：Institute
It is identical with the thickness of annular cover plate to state inner tube, special-shaped funnel shaped variable cross section pipe, is 0.5mm~5mm.
6. a kind of compound superstructure of special-shaped funnel acoustics Helmholz resonance according to claim 1, it is characterised in that：Institute
Stating the compound superstructure material of resonance is plastics, metal or wood materials.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820403253.7U CN208157053U (en) | 2018-03-23 | 2018-03-23 | A kind of compound superstructure of abnormal shape funnel acoustics Helmholz resonance |
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| CN201820403253.7U CN208157053U (en) | 2018-03-23 | 2018-03-23 | A kind of compound superstructure of abnormal shape funnel acoustics Helmholz resonance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111312202A (en) * | 2018-12-11 | 2020-06-19 | 上海汽车集团股份有限公司 | Silencing equipment |
| CN112951190A (en) * | 2021-02-19 | 2021-06-11 | 哈尔滨工程大学 | Variable cross-section pipeline low-frequency broadband vibration damper based on acoustic metamaterial |
-
2018
- 2018-03-23 CN CN201820403253.7U patent/CN208157053U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111312202A (en) * | 2018-12-11 | 2020-06-19 | 上海汽车集团股份有限公司 | Silencing equipment |
| CN111312202B (en) * | 2018-12-11 | 2024-03-08 | 上海汽车集团股份有限公司 | Sound-deadening equipment |
| CN112951190A (en) * | 2021-02-19 | 2021-06-11 | 哈尔滨工程大学 | Variable cross-section pipeline low-frequency broadband vibration damper based on acoustic metamaterial |
| CN112951190B (en) * | 2021-02-19 | 2022-05-20 | 哈尔滨工程大学 | Variable cross-section pipeline low-frequency broadband vibration damper based on acoustic metamaterial |
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