CN106205591A - Miniature Helmholtz resonator broadband noise elimination pipeline based on space folding structure - Google Patents
Miniature Helmholtz resonator broadband noise elimination pipeline based on space folding structure Download PDFInfo
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- CN106205591A CN106205591A CN201610566286.9A CN201610566286A CN106205591A CN 106205591 A CN106205591 A CN 106205591A CN 201610566286 A CN201610566286 A CN 201610566286A CN 106205591 A CN106205591 A CN 106205591A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
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Abstract
The invention discloses the broadband noise elimination pipeline of a kind of miniature Helmholtz resonator based on space folding structure, including the main pipeline upper and lower surface be arrangeding in parallel, upper and lower surface is provided with several cavitys fixed along the size that main pipeline is symmetrical, cavity equidistantly arranges, a pair solid baffle it is provided with between each cavity and main pipeline, forming position, the trunnion of variable cross-section between two solid baffle, be provided with several alternatively distributed parallel beams in described cavity.The present invention is while reducing resonator cavity volume, the crossbeam on some acoustics hard borders is added to divide the sound transmission passage of cavity in inside cavity, the equivalent spring realized with the big identical stiffness factor of cavity it is connected in series by the little spring that the stiffness factor of several equivalences is bigger, do not change the acoustic mass that trunnion is corresponding, realize identical resonant frequency, additionally can change the distance of cross section chamber central position relative with it of trunnion to change the acting frequency of resonator.
Description
Technical field
The present invention relates to a kind of miniature Helmholtz resonator broadband noise elimination pipeline based on space folding structure, belong to
Field of acoustics.
Background technology
Traditional duct attenuation equipment such as Helmholtz resonator pipeline based on resonant silencing, is equivalent to reactive muffling
Device, is made up of trunnion and cavity.Air in trunnion is equivalent to acoustic mass, and whole cavity is equivalent to spring, is analogous to electricity respectively
Learning the inductance in circuit and electric capacity, both are connected in series rear ground connection.When frequency of sound wave and acoustic filter natural frequency closest to time disappear
Volume is maximum, plays acoustic filter effect.But this kind of resonator cavity generally has bigger volume, come by bigger volume
The acoustic capacitance that overall realization is bigger.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of based on space folding structure
The broadband noise elimination pipeline of miniature Helmholtz resonator, while reducing resonator cavity volume, add one in inside cavity
The crossbeam on a little acoustics hard borders divides the sound transmission passage of cavity, by the little spring that the stiffness factor of several equivalences is bigger
It is connected in series the equivalent spring realized with the big identical stiffness factor of cavity, does not change the acoustic mass that trunnion is corresponding, it is achieved identical
Resonant frequency, additionally can change the distance of cross section chamber central position relative with it of trunnion to change resonator
Acting frequency.
Technical scheme: for solving above-mentioned technical problem, the present invention's is a kind of based on space folding structure miniature
The broadband noise elimination pipeline of Helmholtz resonator, including the main pipeline upper and lower surface be arrangeding in parallel, upper and lower surface is pacified
The cavity fixed along the size that main pipeline is symmetrical equipped with several, cavity equidistantly arranges, each cavity and main body tube
Being provided with a pair solid baffle between road, the trunnion that forming position between two solid baffle, cross-sectional area are variable, trunnion is eccentric
The change of rate and cross-sectional area realizes by moving left and right solid baffle, is provided with several alternatively distributed flat in described cavity
Row crossbeam Special composition foldable structure.
As preferably, described cavity and trunnion constitute classical Helmholtz resonator, resonant frequencyWherein V, l, S are cavity volume, trunnion height, trunnion sectional area, and δ is that trunnion is respectively relative to chamber
The endgame correction length sum of body and pipe end, δ=1.7r, r are the radius of trunnion, and c is the velocity of sound in background medium, δ=
1.7r is empirical equation, can substantially calculate resonant frequency.
As preferably, described cavity and trunnion constitute classical Helmholtz resonator, and cavity and trunnion cross section are circle
Shape, resonant frequencyWherein V, l, S are cavity volume, trunnion height, trunnion sectional area, and δ is that trunnion divides
Not relative to the endgame correction length sum of cavity and pipe end, endgame correction
L, b are the diameter of cavity and trunnion, JmFor m rank Bessel function, αmnFor (m, n) wave vector that secondary higher order wave is corresponding, a is trunnion
For geometric center deviation cavity geometric center size.
As preferably, the spacing between adjacent beams is identical, and alternatively distributed parallel beams, to constitute foldable structure, folds
Gap between structure forms acoustic propagation passage.
As preferably, the acoustic impedance of described main pipeline, cavity wall and inside cavity crossbeam is much larger than background medium, extremely
It is the background medium acoustic impedance of 100 times less.
As preferably, the material of described main pipeline, cavity wall and crossbeam is metal or organic plastics.
In the present invention, Helmholtz resonator cavity bigger for script volume can be divided, it is achieved Duo Ge little
Sound transmission passage, be at this moment equivalent to multiple spring that rigidity is stronger for big cavity and be connected in series, finally equivalence
Stiffness factor reduce, it is achieved the acoustic capacitance identical with larger volume cavity.And when dividing cavity, trunnion is not changed,
Acoustic mass is constant, finally can realize identical resonant frequency.It is equal that the length of such as main pipeline is about 200mm, width and height
For 82mm, the length, width and height of cavity are respectively as follows: 40mm, 82mm and 12mm, and trunnion height is 2mm, and the length, width and height of crossbeam are respectively
30mm, 82mm and 1mm, cross-section lengths and the distance deviateing chamber central position are divided with order from left to right from upper left to bottom right
Be not: 1,1,5,7,15,9,19,11mm and-10 ,-2 ,-10 ,-8 ,-10 ,-2 ,-4,4mm, be deviated to the right as just, be deviated to the left
It is negative.The resonant frequency that the resonator of above structural parameters is corresponding is respectively as follows: 850,910,950,1010,1050,1130,
1210、1290Hz.The selection of above-mentioned parameter should follow resonant frequency and the eccentricity of trunnion, the relation curve of sectional area.Frequency
It is chosen as arranging a resonator every about 50Hz.
Beneficial effect: based on space folding structure the miniature Helmholtz resonator broadband noise elimination pipeline of the present invention, only
The cavity needing a kind of physical dimension just can realize the filter action to different frequency, and changing traditional noise elimination device can not
Changing this characteristic of acting frequency, meanwhile the size of cavity includes that length and thickness are greatly reduced, and can be applicable to structure
Size harsh environment, the resonator being made up of the trunnion of different structure size finally by cascade can realize broadband noise control
System.
Accompanying drawing explanation
Fig. 1 is the structural representation of a cavity in the present invention；
Fig. 2 is the principle schematic that classical Helmholtz resonator is equivalent to spring oscillator；
Fig. 3 is the principle schematic that the Helmholtz resonator of the present invention is equivalent to spring oscillator；
Fig. 4 is resonator resonant frequency and length of throat, eccentricity relation figure；
Fig. 5 is the structural representation of the present invention；
Fig. 6 is the sound transmission loss figure of broadband of the present invention hush tube road numerical simulation.
Detailed description of the invention
As shown in Figure 1 and Figure 4, the broadband of based on space folding structure the miniature Helmholtz resonator of the present invention disappears
Sound pipe road, including main pipeline 4 upper and lower surface be arrangeding in parallel, upper and lower surface be respectively provided with 4 right along main pipeline 4
Claiming the cavity 3 that the size of distribution is fixing, the spacing of neighboring chambers 3 is 2mm, and each cavity 3 is internal is provided with two row's crossbeams 1, crossbeam 1
The height of spacing trisection cavity, length is chosen for 3/4 i.e. 30mm of cavity length, is highly chosen for 1mm.In addition main pipeline
A pair solid baffle 2 it is provided with, the blank that forming position between two solid baffle 2, cross-sectional area are variable between 4 and cavity 3
Region i.e. trunnion 5, the change of trunnion 5 eccentricity and cross-sectional area realizes by moving left and right solid baffle 2.Mobile solid gear
Resonator cavity 3 inner sealing need to be kept during plate 2.
In the present invention, described cavity 3 and trunnion 5 constitute the Helmholtz resonator of classics, but resonant frequency is by trunnion
Eccentricity, the sectional area of 5 determine, resonant frequencyWherein V, l, S are cavity 3 volume, trunnion 5 height
With sectional area, c is the velocity of sound in background medium, δ be trunnion 5 be respectively relative to cavity 3 and pipeline 4 end endgame correction length it
With the radius that δ=1.7r, r are trunnion 5.
In the present invention, cavity 3 and trunnion 5 cross section can also be all circular situation, and endgame correction is written asL, b are the diameter of cavity 3 and trunnion 5, JmFor m rank Bessel function, αmn
For (m, n) wave vector that secondary higher order wave is corresponding, a is the size of geometric center deviation cavity 3 geometric center of trunnion 5.
The length of main pipeline 4 is about 200mm, width and be highly 82mm, the length, width and height of cavity 3 be respectively as follows: 40mm,
40mm and 12mm, trunnion 5 height be 2mm, and width is 82mm, length according to resonant frequency and sectional area characteristic such as
Choosing shown in Fig. 4, the length, width and height of crossbeam 1 are respectively 30mm, 40mm and 1mm, and pipeline about 4 comprises 8 symmetrical cavitys 3, adjacent
Spacing distance between cavity 3 is 2mm, cross-section lengths with deviation chamber central position distance from upper left to bottom right with from a left side
Order of turning right is respectively as follows: 1,1,5,7,15,9,19,11mm and-10 ,-2 ,-10 ,-8 ,-10 ,-2 ,-4,4mm, be deviated to the right into
Just, it is deviated to the left as negative.The resonant frequency that the resonator of above structural parameters is corresponding is respectively as follows: 850,910,950,1010,
1050、1130、1210、1290Hz.The selection of above-mentioned parameter should follow resonant frequency and the eccentricity of trunnion, the relation of sectional area
Curve.Frequency is chosen as arranging a resonator every about 50Hz.Pipeline 4 and cavity 3 wall acoustic impedance should be much larger than background
100 times of medium and at least background medium acoustic impedance, material selected here is metal or organic plastics.
Values of the structural parameters for above-mentioned each group of trunnion 5 and cavity 3 can obtain being positioned at the arrowband near resonant frequency altogether
Shake peak, when the Helmholtz of different parameters value is cascaded except by also need in addition to the superposition of formant to consider different resonator it
Between intercouple, numerical simulation finds that the acting frequency width after cascade is more than the superposition of different structure formant, it is clear that this
It is useful for sound insulation filtering.
As Fig. 1 is three dimensional structure parameter schematic diagram and the parameter thereof of the present invention miniature Helmholtz resonator, in order to simplify
Considering, the Helmholtz resonator cavity 3 for three-dimensional case can use two-dimensional structure being perpendicular to two dimensional surface stretching necessarily
Distance replaces, it is desirable to be that stretching distance should be less than half-wavelength, it should be noted that the following resonator knot carrying out numerical simulation
Structure is two-dimensional case, and in figure, b is the length of trunnion 5, and t is the wall thickness of fixed dam 2, and e is the spacing between adjacent beams 1,
L is the length of cavity 3, and d is the width of cavity 3, and h is the height of cavity 3, and a is geometric center deviation cavity 3 geometry of trunnion 5
The size at center.
Fig. 2 and Fig. 3 is classical Helmholtz resonator and the present invention miniature Helmholtz based on space folding structure
Resonator is equivalent to the principle schematic of spring oscillator.Miniature Helmholtz resonator is equivalent to divide sound passage, is analogous to
The spring that stiffness factor is bigger is in series, and final realizes with volume compared with the spring of the identical stiffness factor of large cavity.
Fig. 4 is the point-rendering resonator resonant frequency and two choosing sound intensity transmission rate in the range of certain frequency less than 0.1
Trunnion 5 length Sb, the relation curve of eccentric distance a during dimension situation, owing to the width of trunnion is certain, Fig. 4 is actual can be as larynx
The long-pending relation with resonant frequency of tube section.
Fig. 5 show the two-dimensional structure schematic diagram of noise elimination pipeline in broadband of the present invention.When known resonator resonant frequency with
During the structural parameters curve of cavity 3 and trunnion 5, choose the resonator corresponding to Different structural parameters and its grade is associated in pipeline
Two ends, design parameter value is as noted above.
Fig. 6 is the transmission loss figure of emulation gained sound.The acting frequency scope that simulation result is corresponding is 800Hz
1400Hz, sound transmission loss is all higher than 10dB in this range, and the sound transmission loss of maximum can reach 50dB.
Embodiment: as shown in Figure 4 and Figure 5, the present invention miniature Helmholtz resonator based on space folding structure realizes
Broadband noise elimination pipeline, is provided with the identical cavity of physical dimension 3 and eccentricity, cross-sectional area not what upper and lower surface was respectively symmetrically
Same trunnion 5, the change of trunnion 5 eccentricity and cross-sectional area realizes by moving left and right solid baffle 2.Level on this basis
Connection Different structural parameters resonator, the cavity 3 of 4 same sizes of distribution of a main pipeline 4 upper and lower surface symmetry, totally 8
The resonator of different resonant frequencies.The length of main pipeline 4 is about 200mm, width and be highly 82mm, the length and width of cavity 3
Height is respectively as follows: 40mm, 40mm and 12mm, and trunnion 5 height is 2mm, and width is 82mm, cross-section lengths and deviation cavity 3 center
The distance of position is respectively as follows: 1 from upper left to bottom right with order from left to right, 1,5,7,15,9,19,11mm and-10 ,-2 ,-10 ,-
8 ,-10 ,-2 ,-4,4mm, be deviated to the right as just, be deviated to the left as negative.The resonant frequency that the resonator of above structural parameters is corresponding
Be respectively as follows: 850,910,950,1010,1050,1130,1210,1290Hz.
The above is only the preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. the broadband noise elimination pipeline of a miniature Helmholtz resonator based on space folding structure, it is characterised in that: include
The main pipeline upper and lower surface be arrangeding in parallel, upper and lower surface is provided with several along the symmetrical size of main pipeline
Fixing cavity, cavity equidistantly arranges, and is provided with a pair solid baffle, two solid baffle between each cavity and main pipeline
Between the most variable trunnion of forming position, cross-sectional area, trunnion connects with main pipeline, trunnion eccentricity and cross-sectional area
Change realizes by moving left and right solid baffle, is provided with several alternatively distributed parallel beams and constitutes sky in described cavity
Between foldable structure, the length of crossbeam less than cavity length using slot milling as sound transmission passage.
The broadband noise elimination pipeline of miniature Helmholtz resonator based on space folding structure the most according to claim 1,
It is characterized in that: described cavity and trunnion constitute classical Helmholtz resonator, resonant frequency
Wherein V, l, S are cavity volume, trunnion height, trunnion sectional area, and δ is that trunnion is respectively relative to the end of cavity and pipe end and repaiies
Positive length sum, δ=1.7r, r are the radius of trunnion, and c is the velocity of sound in background medium.
The broadband noise elimination pipeline of miniature Helmholtz resonator based on space folding structure the most according to claim 1,
It is characterized in that: described cavity and trunnion constitute classical Helmholtz resonator, cavity and trunnion cross section are circle, altogether
Vibration frequencyWherein V, l, S are cavity volume, trunnion height, trunnion sectional area, and δ is trunnion phase respectively
For the endgame correction length sum of cavity and pipe end, endgame correctionl,
B is the diameter of cavity and trunnion, JmFor m rank Bessel function, αmnFor (m, n) wave vector that secondary higher order wave is corresponding, a is trunnion
Size for geometric center deviation cavity geometric center.
The broadband noise elimination pipeline of miniature Helmholtz resonator based on space folding structure the most according to claim 1,
It is characterized in that: the spacing between adjacent beams is identical.
The broadband noise elimination pipeline of miniature Helmholtz resonator based on space folding structure the most according to claim 1,
It is characterized in that: the acoustic impedance of described main pipeline, cavity wall and inside cavity crossbeam is much larger than background medium, at least
The background medium acoustic impedance of 100 times.
The broadband noise elimination pipeline of miniature Helmholtz resonator based on space folding structure the most according to claim 5,
It is characterized in that: the material of described main pipeline, cavity wall and crossbeam is metal or organic plastics.
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Cited By (12)
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| CN108463092A (en) * | 2017-02-22 | 2018-08-28 | 中兴通讯股份有限公司 | A kind of denoising device and cabinet |
| CN108682411A (en) * | 2018-05-16 | 2018-10-19 | 南京大学 | A kind of broad band low frequency acoustic muffler |
| CN109243421A (en) * | 2018-11-08 | 2019-01-18 | 南京光声超构材料研究院有限公司 | A kind of low-frequency sound-absorbing structure for sqouynd absorption lowering noise |
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| KR20220056676A (en) * | 2020-10-28 | 2022-05-06 | 재단법인 파동에너지 극한제어 연구단 | Metamaterial muffler for noise reduction in wide bandfrequencies |
| WO2022092630A1 (en) * | 2020-10-28 | 2022-05-05 | 재단법인 파동에너지 극한제어연구단 | Meta muffler for reducing broadband noise |
| CN112344544A (en) * | 2020-10-30 | 2021-02-09 | 南京大学 | Natural ventilation sound insulation structure applied to transformer noise control |
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Application publication date: 20161207 |