CN105869620A - Broadband and stable multi-arm folded acoustic eddy field transmitter - Google Patents
Broadband and stable multi-arm folded acoustic eddy field transmitter Download PDFInfo
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- CN105869620A CN105869620A CN201610177364.6A CN201610177364A CN105869620A CN 105869620 A CN105869620 A CN 105869620A CN 201610177364 A CN201610177364 A CN 201610177364A CN 105869620 A CN105869620 A CN 105869620A
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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
- G10K11/18—Methods or devices for transmitting, conducting or directing sound
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Abstract
The invention discloses a broadband and stable multi-arm folded acoustic eddy field transmitter, which comprises a substrate, wherein n pieces of spiral grooves are formed in the substrate, and n is a positive integer; when one spiral groove is formed in the substrate, two spiral curves of the spiral groove are as shown in Description; and when two spiral grooves are formed in the substrate, two spiral curve of the mth spiral groove are as shown in Description, wherein m is a positive integer. The acoustic eddy field transmitter disclosed by the invention is of a planar structure, and the thickness of the acoustic eddy field transmitter, in a transmission direction (provided that the transmission direction is in an Z direction), is nearly not limited; therefore, the acoustic eddy field transmitter can be designed as an ultra-thin sheet-shaped structure (the minimal thickness is about 3mm), and meanwhile, the acoustic eddy field transmitter can be made as a thicker cylindrical body in accordance with specific requirements, while the radius of the entire transmitter within an x-y plane is just 3.6cm; by regulating the number of arms of the structure, an acoustic eddy field of corresponding orders can be generated; and the functions, without any circuit control means, can be achieved just by structural properties of the acoustic eddy field transmitter.
Description
Technical field
The present invention relates to the multi-arm folded form acoustics rotational field emitter that wideband is stable, belong to acoustical device field.
Background technology
To carrying orbital angular momentum, there is the research of the acoustics rotational field of helical phase characteristic distributions, have in practice
Important value.How to design the acoustics rotational field emitter that a kind of broadband, exponent number are stable, always association area
One study hotspot.
In current existing technical merit, acoustics rotational field emitter can be largely classified into two kinds, and one is to utilize in a large number
Acoustic transducer be arranged into acoustic array, and by the phase delay of electricity means each transducer independently controlled,
Whole transducer array is considered as a rotational field emitter, and produced total sound field is the superposition of single transducer；Second
Planting emitter is the feature utilizing its thickness the most in spiral distribution, causes when acoustics plane wave incidence, sound
Ripple is different in the length of the propagation path of the various location equivalence of structure, thus produces acoustics rotational field.
But, current both acoustics rotational field emitters, all there is respective defect and deficiency.The first acoustics whirlpool
In curl field emitter, whole acoustic array typically requires hundreds of the most thousands of acoustic transducers, by the electricity of lengthy and tedious complexity
Each transducer is individually regulated and controled by road, by the huge cost brought and complicated operating process.The frequency of incident acoustic wave
The highest, corresponding wave length of sound is the shortest, and when the size of single transducer reaches the order of magnitude of wave length of sound, acoustic array
The method of row will lose efficacy, and therefore, can produce high-frequency acoustics rotational field hardly by the method for acoustic array.And the
Two kinds of acoustics rotational field emitters are only capable of for single frequency effective.In other words, when the frequency of rotational field of required generation
During rate change, it is necessary to the Spiral distribution function of the thickness that restructures, to reach required phase delay Spreading requirements.With
Time, helical form geometric thickness makes this structure can not have a shape of plane at incidence end and exit end, and plane,
The feature of small size has very important value in actual application.Additionally, the sound produced by above two emitter
Learn rotational field, in being only capable of the shortest distance, ensure that the exponent number of rotational field is stablized constant.Produce and stablize rank
The acoustics rotational field of number, is the most necessary and important.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the multi-arm that the present invention provides a kind of wideband stable folds
Type acoustics rotational field emitter, by the most special diffraction of sound wave, it is possible in the widest frequency range, is propagating
Produce exponent number on direction to stablize and regulatable acoustics rotational field.
Technical scheme: for achieving the above object, the multi-arm folded form acoustics rotational field emitter that the wideband of the present invention is stable,
Including substrate, including substrate, described substrate is provided with n helicla flute, and n is positive integer；A helicla flute is had on substrate
Time, two spiral curves of spiral fluted are: r1=a1ebθAnd r2=a2ebθ, 5mm≤a1≤ 15mm, a1+0.5mm
≤a2≤a1+ 2.5mm, 0.0215≤b≤0.0235, the value of θ is from 0 to 12 π；When substrate is provided with at least two spiral shell
During spin slot, two spiral curves of m-th spiral fluted areWith
M≤n, m are positive integer, 5mm≤a1≤ 15mm, a1+0.5mm≤a2≤a1+ 2.5mm, 0.0441≤b≤0.912,
The value of θ is π from 0 to 12/n.
As preferably, the acoustic impedance of described substrate is at least 20 times of background media acoustic impedance.
As preferably, described substrate having a helicla flute, the equation of two helixes is r1=a1ebθAnd r2=a2ebθ,
a1=13.8mm, a2The value of=14.85mm, b=0.0225, θ is from 0 to 12 π.
As preferably, described substrate having two helicla flutes, the equation of two helixes of spiral fluted of m-th isWithM≤2, m is positive integer, a1=13.8mm, a2=14.85
The value of mm, b=0.0451, θ is from 0 to 6 π.
As preferably, described substrate having three helicla flutes, the equation of two helixes of spiral fluted of m-th isWithM≤3, m is positive integer, a1=13.8mm, a2=14.85
The value of mm, b=0.0676, θ is from 0 to 4 π.
As preferably, described substrate having four helicla flutes, the equation of two helixes of spiral fluted of m-th isWithM≤4, m is positive integer, a1=13.8mm, a2=14.85
The value of mm, b=0.0902, θ is from 0 to 3 π.
Beneficial effect: the multi-arm folded form acoustics rotational field emitter that the wideband of the present invention is stable, is a kind of plane-shaped structure,
Its thickness on the direction of propagation (assuming that the direction of propagation is z direction) is little affected by limiting, and both can make ultra-thin sheet
Shape (minimum about 3mm), it is also possible to make thicker cylinder according to real needs, and whole emitter is put down at x-y
Radius in face is only 3.6cm, by adjusting the number of the arm of structure, can produce the acoustics rotational field of corresponding exponent number,
It need not any circuit control measures, the only architectural characteristic by self just can realize above-mentioned functions.
Accompanying drawing explanation
Fig. 1 is the design diagram of the single armed folded form emitter of single order acoustics rotational field.
Fig. 2 is the design diagram of the both arms folded form emitter of second order acoustics rotational field.
Fig. 3 is the design diagram of three arm folded form emitters of three rank acoustics rotational fields.
Fig. 4 is the design diagram of four arm folded form emitters of quadravalence acoustics rotational field.
Fig. 5 is the emulation PHASE DISTRIBUTION figure of Fig. 1.
Fig. 6 is the emulation PHASE DISTRIBUTION figure of Fig. 2.
Fig. 7 is the emulation PHASE DISTRIBUTION figure of Fig. 3.
Fig. 8 is the emulation PHASE DISTRIBUTION figure of Fig. 4.
Fig. 9 is 425kHz, 625kHz, in the plane of distance exit facet 0.85 λ, 2.5 λ and 5 λ, around the one of rotational field
On individual circumference, the experiment of phase place change curve and simulation result comparison diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is further described.
As it is shown in figure 1, offer a helicla flute on substrate, inside and outside spiral fluted, the equation of two helixes is
r1=a1ebθAnd r2=a2ebθ, a1=13.8mm, a2The value of=14.85mm, b=0.0225, θ is from 0 to 12 π.
Substrate can make various different shape as required.
As in figure 2 it is shown, there are two helicla flutes on substrate, the equation of two helixes of spiral fluted of m-th isWithM≤2, m is positive integer, a1=13.8mm, a2=14.85
The value of mm, b=0.0451, θ is from 0 to 6 π.Two spiral fluted shapes are just the same, second helicla flute phase
When rotating 180 ° in first helicla flute.
As it is shown on figure 3, there are three helicla flutes on substrate, the equation of two helixes of spiral fluted of m-th isWithM≤3, m is positive integer, a1=13.8mm, a2=14.85
The value of mm, b=0.0676, θ is from 0 to 4 π.Three helicla flute shapes are just the same, second helicla flute and
Three helicla flutes are equivalent to first helicla flute and rotate 120 degree and 240 degree respectively.
As shown in Figure 4, substrate having four helicla flutes, the equation of two helixes of spiral fluted of m-th isWithM≤4, m is positive integer, a1=13.8mm, a2=14.85
The value of mm, b=0.0902, θ is from 0 to 3 π.Four helicla flute shapes are just the same, second helicla flute,
Three helicla flutes and the 4th helicla flute be equivalent to first helicla flute 90-degree rotation respectively, 180 degree and 270 degree.
Emulating four kinds of structures of Fig. 1 to Fig. 4, background media is set as water, and the frequency of incident acoustic wave is from 300kHz
It is gradually increased to 750kHz, the material 17-4 rustless steel of substrate.As shown in Fig. 5 to Fig. 8, the most corresponding multi-arm
Folded form acoustics rotational field generator 425kHz, distance 2.5 wavelength of exit facet plane in, produced single order,
Second order, three rank, the PHASE DISTRIBUTION figure of quadravalence sound rotational field.Corresponding PHASE DISTRIBUTION occurs once in a circumference, two
Secondary, the sudden change of three times, four times 2 π, these features are identical with the character of the acoustics rotational field of corresponding exponent number, illustrate set
The structure of meter can ideally produce required acoustics rotational field.
As illustrated in fig. 9, substrate offering a helicla flute, incident acoustic wave frequency is 425kHz, 625kHz, along passing
Broadcast in the distance exit facet 2.5 λ plane of direction, on a circumference of rotational field, the experiment of phase place change curve and emulation
Comparative result figure；As shown in figure 9b, substrate offering four helicla flutes, incident acoustic wave frequency is 425kHz, 625kHz,
Along the direction of propagation distance exit facet 2.5 λ plane along, on a circumference of rotational field, the experiment of phase place change curve and
Simulation result comparison diagram, this structure designed by explanation can produce required acoustics rotational field in the range of wideband；As
Shown in Fig. 9 c, substrate offering a helicla flute, incident acoustic wave frequency is 425kHz, along direction of propagation distance outgoing
In face 0.85 λ, 2.5 λ and 5 λ planes, on a circumference of rotational field, the experiment of phase place change curve and emulation knot
Really comparison diagram；As shown in figure 9d, substrate offering four helicla flutes, incident acoustic wave frequency is 425kHz, along propagating
On direction distance exit facet 0.85 λ, 2.5 λ and 5 λ planes, on a circumference of rotational field, the reality of phase place change curve
Test and simulation result comparison diagram.Exponent number is produced steady in the scope that this structure designed by explanation can be the widest
Fixed acoustics rotational field.
The above is only the preferred embodiment of the present invention, it should be pointed out that: for those skilled in the art
For, 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 are also
Should be regarded as protection scope of the present invention.
Claims (6)
1. the multi-arm folded form acoustics rotational field emitter that a wideband is stable, it is characterised in that: include substrate, described
Substrate is provided with n helicla flute, and n is positive integer；When having a helicla flute on substrate, two spiral curves of spiral fluted
For: r1=a1ebθAnd r2=a2ebθ, 5mm≤a1≤ 15mm, a1+0.5mm≤a2≤a1+ 2.5mm, 0.0215≤b
The value of≤0.0235, θ is from 0 to 12 π；When substrate is provided with at least two helicla flute, m-th spiral fluted two
Root spiral curve isWithM≤n, m are positive integer, 5mm
≤a1≤ 15mm, a1+0.5mm≤a2≤a1+ 2.5mm, 0.0441≤b≤0.912, the value of θ is π from 0 to 12/n.
The multi-arm folded form acoustics rotational field emitter that wideband the most according to claim 1 is stable, it is characterised in that:
The acoustic impedance of described substrate is at least 20 times of background media acoustic impedance.
The multi-arm folded form acoustics rotational field emitter that wideband the most according to claim 2 is stable, it is characterised in that:
Having a helicla flute on described substrate, the equation of two helixes is r1=a1ebθAnd r2=a2ebθ, a1=13.8mm,
a2The value of=14.85mm, b=0.0225, θ is from 0 to 12 π.
The multi-arm folded form acoustics rotational field emitter that wideband the most according to claim 2 is stable, it is characterised in that:
Having two helicla flutes on described substrate, the equation of two helixes of spiral fluted of m-th isWithM≤2, m is positive integer, a1=13.8mm, a2=14.85
The value of mm, b=0.0451, θ is from 0 to 6 π.
The multi-arm folded form acoustics rotational field emitter that wideband the most according to claim 2 is stable, it is characterised in that:
Having three helicla flutes on described substrate, the equation of two helixes of spiral fluted of m-th isWithM≤3, m is positive integer, a1=13.8mm, a2=14.85
The value of mm, b=0.0676, θ is from 0 to 4 π.
The multi-arm folded form acoustics rotational field emitter that wideband the most according to claim 2 is stable, it is characterised in that:
Having four helicla flutes on described substrate, the equation of two helixes of spiral fluted of m-th isWithM≤4, m is positive integer, a1=13.8mm, a2=14.85
The value of mm, b=0.0902, θ is from 0 to 3 π.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108831433A (en) * | 2018-08-08 | 2018-11-16 | 广东工业大学 | A kind of super surface of acoustics and sound vortex wave producer |
| CN110010119A (en) * | 2019-04-08 | 2019-07-12 | 广东工业大学 | A kind of super surface texture of acoustics and sound vortex wave producer |
| CN111447015A (en) * | 2020-03-20 | 2020-07-24 | 哈尔滨工程大学 | Multi-order sound track angular momentum transmitting transducer array |
| CN111551243A (en) * | 2020-05-08 | 2020-08-18 | 天津大学 | Working frequency expanding method for resonance cavity hydrophone |
| CN111785244A (en) * | 2020-07-06 | 2020-10-16 | 南京师范大学 | Acoustic focusing fraction vortex field transmitter |
| CN114822482A (en) * | 2022-03-11 | 2022-07-29 | 南京师范大学 | Coupled acoustic vortex transmitter and application thereof |
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| CN104505085A (en) * | 2014-12-03 | 2015-04-08 | 南京大学 | Ultra-wideband acoustic absorber |
| CN104751841A (en) * | 2015-04-14 | 2015-07-01 | 南京大学 | Acoustic material capable of achieving ultra-wide-band sound wave redirection |
| CN105158729A (en) * | 2015-09-25 | 2015-12-16 | 南京大学 | Sound source directional sensing device with deep sub-wavelength size |
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2016
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Patent Citations (3)
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| CN104505085A (en) * | 2014-12-03 | 2015-04-08 | 南京大学 | Ultra-wideband acoustic absorber |
| CN104751841A (en) * | 2015-04-14 | 2015-07-01 | 南京大学 | Acoustic material capable of achieving ultra-wide-band sound wave redirection |
| CN105158729A (en) * | 2015-09-25 | 2015-12-16 | 南京大学 | Sound source directional sensing device with deep sub-wavelength size |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108831433A (en) * | 2018-08-08 | 2018-11-16 | 广东工业大学 | A kind of super surface of acoustics and sound vortex wave producer |
| CN108831433B (en) * | 2018-08-08 | 2023-07-25 | 广东工业大学 | Acoustic super-surface and acoustic vortex wave generator |
| CN110010119A (en) * | 2019-04-08 | 2019-07-12 | 广东工业大学 | A kind of super surface texture of acoustics and sound vortex wave producer |
| CN110010119B (en) * | 2019-04-08 | 2023-05-05 | 广东工业大学 | Acoustic super-surface structure and acoustic vortex wave generator |
| CN111447015A (en) * | 2020-03-20 | 2020-07-24 | 哈尔滨工程大学 | Multi-order sound track angular momentum transmitting transducer array |
| CN111551243A (en) * | 2020-05-08 | 2020-08-18 | 天津大学 | Working frequency expanding method for resonance cavity hydrophone |
| CN111785244A (en) * | 2020-07-06 | 2020-10-16 | 南京师范大学 | Acoustic focusing fraction vortex field transmitter |
| CN114822482A (en) * | 2022-03-11 | 2022-07-29 | 南京师范大学 | Coupled acoustic vortex transmitter and application thereof |
| CN114822482B (en) * | 2022-03-11 | 2023-05-23 | 南京师范大学 | Coupled sound vortex emitter and application thereof |
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