CN105719639B - A kind of acoustical material with the Acoustic focusing for realizing self-healing properties - Google Patents
A kind of acoustical material with the Acoustic focusing for realizing self-healing properties Download PDFInfo
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- CN105719639B CN105719639B CN201610038965.9A CN201610038965A CN105719639B CN 105719639 B CN105719639 B CN 105719639B CN 201610038965 A CN201610038965 A CN 201610038965A CN 105719639 B CN105719639 B CN 105719639B
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- wave beam
- pipeline
- healing properties
- airy
- acoustic focusing
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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
- G10K11/26—Sound-focusing or directing, e.g. scanning
- G10K11/30—Sound-focusing or directing, e.g. scanning using refraction, e.g. acoustic lenses
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Abstract
The invention discloses a kind of acoustical materials with the Acoustic focusing for realizing self-healing properties, Airy wave beam generation device including bilateral symmetry distribution, the Airy wave beam generation device includes the piping unit that several are close to arrangement along straight line, each piping unit always includes the pipeline that several are close to arrangement along straight line, the length of all pipelines is identical, each and every one several pipelines in each piping unit it is of same size, zero refraction materials of different depth are filled in each pipeline.Realization of the invention has the acoustical material for the Acoustic focusing for realizing self-healing properties, the self-healing properties of Airy wave beam and the phase distribution characteristic that zero refraction materials are constant is cleverly utilized, a pair of of Airy wave beam is placed simply in symmetric position realizes the Acoustic focusing with self-healing properties, the characteristic makes sound wave continue to propagate around some barriers present in path in communication process, largely weakens influence of the barrier to focusing effect.
Description
Technical field
The present invention relates to a kind of acoustical materials with the Acoustic focusing for realizing self-healing properties, belong to acoustical material neck
Domain.
Background technique
Acoustic focusing is with a wide range of applications in non-destructive testing, medical diagnosis and therapy field, phonon crystal and
Acoustic focusing may be implemented in acoustic metamaterial.But there is some ask in the Acoustic focusing that existing method is realized in practical applications
Topic, for example, during high-strength focusing ultrasonic therapy, if there are barrier, the effect meetings of focusing in the propagation path of ultrasound
By severe jamming, the effect for the treatment of is influenced.Therefore, it is necessary to realize that a kind of Acoustic focusing with self-healing properties is above-mentioned to solve
Problem.Airy wave beam is one kind of non-diffracted beam, and sound can be made by having from characteristics, the self-healing properties such as bending and selfreparing
Wave cut-through object continues to propagate, therefore can use the characteristic of Airy wave beam to realize that the acoustics with self-healing properties is poly-
It is burnt.Zero refraction materials have infinitely great wavelength and phase velocity and constant phase distribution, leave zero refraction materials
The shape of wavefront depends on the shape in the material outlet face.Therefore, it by designing a series of shape of pipelines, and fills corresponding deep
Zero refraction materials of degree, with phase distribution needed for meeting Airy wave beam, so that obtaining above-mentioned required has selfreparing special
The Airy wave beam of property.
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 special with realization selfreparing
Property Acoustic focusing acoustical material, generate Airy wave beam using zero refraction materials, and according to Airy wave beam from bending and
Self-healing properties, the Airy wave beam generated by using a pair by zero refraction materials realize that the acoustics with self-healing properties gathers
It is burnt.
Technical solution: in order to solve the above technical problems, of the invention is a kind of with the Acoustic focusing for realizing self-healing properties
Acoustical material, including bilateral symmetry distribution Airy wave beam generation device, the Airy wave beam generation device includes several
It is close to the piping unit of arrangement along straight line, each piping unit always includes the p pipelines for being close to arrangement along straight line, and p is positive integer,
The length of all pipelines is identical, is the wave length of sound in the air under certain frequency, p pipeline in each piping unit
Of same size, the overall width of p pipeline is the Airy wave beam half-wavelength of corresponding position, and different depths are filled in each pipeline
Zero refraction materials are spent, the depth of material is H, 0≤H≤λ in each pipeline0, as Ai (10x) >=0, H=(2m+1) λ0/2-
10h sinθ；As Ai (10x) < 0, H=n λ0- 10h sin θ, wherein the length direction along pipeline is y-axis, and zero point is located at sound
The symmetrical centre point of material is learned, x-axis is the direction of conduit arrangements, λ0For the wave length of sound in air, m and n are for controlling zero
Refraction materials depth arrives λ 00Integer in range, the h of each pipeline are equal to the horizontal distance at its center and y-axis, and θ is to use
Adjust the bending direction of Airy wave beam,
Preferably, θ=0.9 °.
In the present invention, Airy wave beam is one kind of non-diffracted beam, the characteristic with selfreparing, therefore symmetrically placed
A pair of of Airy wave beam is also to have self-healing properties.Acoustical material in the present invention can produce a pair of symmetrical Airy wave
Beam, realize Acoustic focusing theoretically for there is self-repair function.
The utility model has the advantages that realization of the invention has the acoustical material for the Acoustic focusing for realizing self-healing properties, it is cleverly sharp
With the phase distribution characteristic that the self-healing properties of Airy wave beam and zero refraction materials are constant, simply in symmetric position
Placing a pair of of Airy wave beam realizes the Acoustic focusing with self-healing properties, which makes sound wave in communication process around passing by one's way
Some barriers present in diameter continue to propagate, and largely weaken influence of the barrier to focusing effect.
Detailed description of the invention
Fig. 1 be in embodiment the Airy function Ai (10x) that chooses with the change curve of x；
Fig. 2 is the structural schematic diagram for being used to generate the Airy wave beam of Fig. 1 in the present invention；
Fig. 3 is the sound intensity numerical simulation figure that structure generates as shown in Figure 2；
Fig. 4 is the lens schematic diagram for being used to realize Acoustic focusing in the present invention；
Fig. 5 is the sound intensity numerical simulation figure that lens generate as shown in Figure 4；
Fig. 6 is that the sound intensity numerical simulation figure after barrier is added in structure shown in Fig. 5.
Specific embodiment
Embodiment 1
As shown in figure 4, there is the acoustical material for the Acoustic focusing for realizing self-healing properties, the Chinese mugwort including bilateral symmetry distribution
In wave beam generation device, Airy wave beam generation device is as shown in Fig. 2, the Airy wave beam generation device includes several along straight line
It is close to the piping unit of arrangement, each piping unit always includes the p pipelines for being close to arrangement along straight line, and p is positive integer, this implementation
The each piping unit of example includes 4 pipelines, and the length of all pipelines is identical, is the sound wave wave in the air under certain frequency
Long, the frequency chosen in the present invention is 4500Hz.Fig. 1 is bent with the variation of x for the Airy function Ai (10x) chosen in the present invention
Line, the present invention can also choose other Airy functions, and the half-wavelength of the Airy wave beam at the bright different location of the chart is different
, half-wavelength here refers to the distance between two adjacent zero crossings of curve, and the width of each piping unit is equal to phase
The half-wavelength of the Airy wave beam on position is answered, therefore the width of each piping unit is also different, in each piping unit
Four pipelines it is of same size, the width of pipeline is a quarter of the Airy wave beam half-wavelength of corresponding position, in each pipe
Zero refraction materials of different depth are filled in road, the depth of material is H in each pipeline,As Ai (10x) >=0, H=(2m+1) λ0/2-10h sinθ；Work as Ai
When (10x) < 0, H=n λ0- 10h sin θ, wherein the length direction along pipeline is y-axis, and zero point is located at the symmetrical of acoustical material
Central point, x-axis are the direction of conduit arrangements, λ0For the wave length of sound in air, m and n are for controlling zero refraction materials depth
Degree arrives λ 00Integer in range, the h of each pipeline are equal to the horizontal distance at its center and y-axis, and θ is for adjusting Airy wave
The bending direction of beam, the present invention in choose be used to control Airy beam-bending direction angle, θ value be 0.9 °, in fact,
θ can arbitrarily value may be implemented by selecting suitable θ value using the material in the present invention in a certain range
Acoustic focusing on different location.
Structure shown in Fig. 2 is rotated to the right 90 °, is placed on the y axis, the region as shown in Fig. 3 white wire frame.Fig. 3 gives
Sound intensity numerical simulation figure caused by structure as shown in Figure 2, frequency is 4500Hz in numerical simulation, and background medium is air, close
Spend ρ=1.21kg/m3, velocity of sound c=343m/s.Should the result shows that in the present invention structure shown in Fig. 2 be can produce have from
The Airy wave beam of the characteristics such as bending.
Fig. 4 be designed in the present invention be used to realize the lens schematic diagram of Acoustic focusing, which is as shown in a pair of of Fig. 2
Structure be placed on and constituted on symmetrical position.If the lens are rotated to the right 90 ° to place on the y axis, the sound intensity
Numerical simulation is as shown in figure 5, white wire frame inner region is structure shown in Fig. 4 in figure.Plane sound wave is incident to by left side
Mirror, it can be seen that acoustic energy is concentrated in the x-axis at a certain distance from sound source, has good Acoustic focusing effect.
In addition, for the characteristic whether Acoustic focusing that the lens verified in the present invention are realized has selfreparing, in Fig. 5
A circular barrier is placed in shown structure, as shown in white circle in Fig. 6.In the presence of what Fig. 6 was provided is barrier
Sound intensity distribution, as seen from the figure, after barrier is added, sound wave meeting cut-through object continues to propagate, and still has preferable acoustics poly-
Burnt effect.The consistency of Fig. 5 and Fig. 6 result shows the presence of barrier, and there is no the effects of severe jamming Acoustic focusing, namely
Show that the Acoustic focusing with self-healing properties may be implemented in the lens in the present invention.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (2)
1. the acoustical material with the Acoustic focusing for realizing self-healing properties, it is characterised in that: the Chinese mugwort including bilateral symmetry distribution
In wave beam generation device, the Airy wave beam generation device, which includes several, is close to piping units of arrangement, Mei Geguan along straight line
Road unit always includes the p pipelines for being close to arrangement along straight line, and it is certain frequency that p, which is positive integer, and the length of all pipelines is identical
Under air in wave length of sound, p pipeline in each piping unit it is of same size, the overall width of p pipeline is to correspond to
Airy wave beam half-wavelength at position is filled with zero refraction materials of different depth, material in each pipeline in each pipeline
Depth be H, 0≤H≤λ0, as Ai (10x) >=0, H=(2m+1) λ0/2-10hsinθ；As Ai (10x) < 0, H=n λ0-
10hsin θ, wherein the length direction along pipeline is y-axis, and zero point is located at the symmetrical centre point of acoustical material, and x-axis is conduit arrangements
Direction, λ0For the wave length of sound in air, m and n are for controlling zero refraction materials depth 0 to λ0Integer in range,
The h of each pipeline is equal to the horizontal distance at its center and y-axis, and θ is the bending direction for adjusting Airy wave beam,
2. the acoustical material with the Acoustic focusing for realizing self-healing properties according to claim 1, it is characterised in that: institute
State θ=0.9 °.
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| CN201610038965.9A CN105719639B (en) | 2016-01-20 | 2016-01-20 | A kind of acoustical material with the Acoustic focusing for realizing self-healing properties |
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| CN105719639B true CN105719639B (en) | 2019-09-10 |
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Citations (3)
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| CN101419337A (en) * | 2008-11-28 | 2009-04-29 | 中国科学技术大学 | Superresolved phase modulating sheet for flare three-dimensional compression and its processing method |
| CN104751840A (en) * | 2015-04-14 | 2015-07-01 | 南京大学 | Acoustic material capable of achieving ultra-wide-band sound wave focusing |
| CN104916279A (en) * | 2015-04-14 | 2015-09-16 | 南京大学 | Acoustic material having ultra-wideband acoustic extraordinary reflection function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8361593B2 (en) * | 2007-10-17 | 2013-01-29 | Lockheed Martin Corporation | Plasmonic coatings for reflectors |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419337A (en) * | 2008-11-28 | 2009-04-29 | 中国科学技术大学 | Superresolved phase modulating sheet for flare three-dimensional compression and its processing method |
| CN104751840A (en) * | 2015-04-14 | 2015-07-01 | 南京大学 | Acoustic material capable of achieving ultra-wide-band sound wave focusing |
| CN104916279A (en) * | 2015-04-14 | 2015-09-16 | 南京大学 | Acoustic material having ultra-wideband acoustic extraordinary reflection function |
Non-Patent Citations (3)
| Title |
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| "One-way acoustic mirror based on anisotropic zero-index media";gu zhongming，et al.;《Applied Physics Letters》;20151231;第107卷(第21期);全文 |
| "Plasmonic airy beam generated by in-plane diffraction";L. li, et al.;《PHYSICAL REVIEW LETTERS》;20110916;全文 |
| "基于自弯曲波束的声学聚焦";郜贺 等;《声学技术》;20151231;第34卷(第6期);全文 |
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