CN106205597A - Realize underwater sound wave and orient stealthy phonon functional structure and manufacture method - Google Patents
Realize underwater sound wave and orient stealthy phonon functional structure and manufacture method Download PDFInfo
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- CN106205597A CN106205597A CN201610536880.3A CN201610536880A CN106205597A CN 106205597 A CN106205597 A CN 106205597A CN 201610536880 A CN201610536880 A CN 201610536880A CN 106205597 A CN106205597 A CN 106205597A
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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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- 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
- G10K11/20—Reflecting arrangements
- G10K11/205—Reflecting arrangements for underwater use
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Abstract
Embodiments provide a kind of underwater sound wave that realizes and orient stealthy phonon functional structure and manufacture method.The described underwater sound wave that realizes orients stealthy phonon functional structure, including: alloy matrix aluminum；The hole according to plane positive triangular crystal lattice periodic arrangement it is drilled with on described alloy matrix aluminum.The centre of described alloy matrix aluminum is provided through the cavity of described alloy matrix aluminum, is used for placing target to be concealed.The structure of the present invention only need to be holed on alloy matrix aluminum and be obtained, and processing is simple.
Description
Technical field
The present invention relates to field of acoustics, particularly relate to a kind of underwater sound wave that realizes and orient stealthy phonon functional structure and system
Make method.
Background technology
Optics and Acoustics Stealth Technology can make object hide the detection of electromagnetic wave or sound wave.2006, kingdom of Britain managed
Professor J.B.Pendry of engineering college proposes the stealthy cover arrangement method of optically-based conversion first, and corresponding result of study is sent out
Table is on " science " magazine, and has led the research boom to Meta Materials.Meta Materials possesses certain not available for natural material
A little characteristics, as make ripple " walk around " material surface realize that acoustics is stealthy, optic camouflage and electromagnetic wave stealthy etc..Stealthy it is crucial that
Design, including the queueing discipline of the microstructure unit and these unit designing certain sub-wavelength rank, and finally determines its thing
Reason characteristic (such as dielectric constant, pcrmeability, bulk modulus and mass density etc.).
Sound stealth is the most just to start to cause the concern of people and proceeding by research.This is mainly by currently
The undersea detection of submarine is mainly used active/passive sonar, but ranging information can be produced when target is positioned by passive sonar and forbidden
Problem.Additionally, advanced submarine Sound stealth performance is greatly improved so that the Effect on Detecting of passive sonar declines.Therefore, master is utilized
Dynamic radiocoustic position finding becomes detection submarine and implements the important means of precision strike.Have in terms of theoretical research although Meta Materials is stealthy
Very fast progress, but a bottleneck is that the performance of material is severely limited by absorption loss water.Acoustic construction is designed by acoustics cape simultaneously
The harshest with processing request, experimental verification aspect progress is slower.Therefore scientific research personnel proposes other methods many in fact
Now sound wave is stealthy, as utilized photonic crystal structure.
Phonon crystal (artificial cycle structure) is the artificial cycle elastic fluid structure with phonon-side bands.Sound wave is utilized to exist
Propagation law in different cycles structural material, and the constituent element of different materials and structure thereof are to band structure and the regulation and control of band gap
Mechanism, with design optimization phonon crystal to be modulated sound field form, thus can control propagation and the distribution of sound wave.By setting
The phonon crystal of meter structure gradient distribution can realize the graded of refractive index, so that sound wave gets around stealthy regional spread also
Realize Sound stealth in a particular direction.
Summary of the invention
The embodiment provides a kind of underwater sound wave that realizes and orient stealthy phonon functional structure and manufacture method,
Processing is simple.
To achieve these goals, this invention takes following technical scheme.
A kind of underwater sound wave that realizes orients stealthy phonon functional structure, including:
Alloy matrix aluminum；
Being drilled with the through hole according to plane positive triangular crystal lattice periodic arrangement on described alloy matrix aluminum, described through hole is along Z
Direction of principal axis runs through described alloy matrix aluminum.
The centre of described alloy matrix aluminum is provided with the cavity running through described alloy matrix aluminum along Z-direction, is used for placing
Target to be concealed.
The diameter of described cavity is less than or equal to the half of described alloy matrix aluminum width along the y-axis direction.
Described through hole includes: regular hexagon hole；
Each limit of described regular hexagon hole connects T-shaped hole.
Described alloy matrix aluminum is symmetrical along X-direction；
The size of described regular hexagon hole is along Y direction distribution gradient, the refractive index ladder of described regular hexagon hole
Spending along Y direction is hyperbolic secant distribution；
Described regular hexagon hole is distribution in the same size along X-direction, and the refractive index of described regular hexagon hole is along X-axis
Direction is uniformly distributed.
When stealthy frequency is 25kHz, the density of described alloy matrix aluminum is ρ=2.7g/cm3；Described alloy matrix aluminum
Longitudinal wave velocity and transverse wave speed be respectively cl=6.15km/s and ct=3.1km/s；
Lattice paprmeter a=20mm of described regular hexagon hole；Described alloy matrix aluminum length L=in the X-axis direction
24a；
The size of described T-shaped hole is respectively as follows: the cross-drilled hole border to the unit cell of described alloy matrix aluminum of T-shaped hole
Distance b=0.0275a, length e=0.32a of the cross-drilled hole of T-shaped hole, the width h=0.06a of the cross-drilled hole of T-shaped hole
Width t=0.05a with the vertical core of T-shaped hole；
The aperture d of described regular hexagon hole is followed successively by 0.5a, 0.507a, 0.526a, 0.556a along the size of y-axis,
0.594a,0.636a,0.68a。。
Described alloy matrix aluminum is at least ten times that thickness is described lattice paprmeter of Z-direction.
A kind of manufacture method realizing the stealthy phonon functional structure of underwater sound wave orientation, it is characterised in that including:
Select an alloy matrix aluminum；
Described alloy matrix aluminum cuts out the through hole according to plane positive triangular crystal lattice periodic arrangement, described through hole
Described alloy matrix aluminum is run through along Z-direction.
The manufacture method of described phonon functional structure, also includes:
Cut out the cavity running through described alloy matrix aluminum in the centre of described alloy matrix aluminum, be used for placing mesh to be concealed
Mark.
The manufacture method of described phonon functional structure, also includes:
Alloy matrix aluminum bonding described at least two of described through hole will be cut out so that the described aluminium alloy after bonding
Matrix is at thickness is lattice paprmeter at least ten times of z-axis direction.
The technical scheme provided by embodiments of the invention described above is it can be seen that the structure of the embodiment of the present invention only need to be at aluminum
On alloy substrate, boring obtains, and processing is simple.
Aspect and advantage that the present invention adds will part be given in the following description, and these will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, required use in embodiment being described below
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for this
From the point of view of the those of ordinary skill of field, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
A kind of vertical view realizing the stealthy phonon functional structure of underwater sound wave orientation that Fig. 1 provides for the embodiment of the present invention
Figure；
A kind of solid realizing the stealthy phonon functional structure of underwater sound wave orientation that Fig. 2 provides for the embodiment of the present invention is shown
It is intended to；
Fig. 3 is the schematic diagram of the unit cell realizing the stealthy phonon functional structure of underwater sound wave orientation in Fig. 1；
A kind of stealthy effect realizing the stealthy phonon functional structure of underwater sound wave orientation that Fig. 4 provides for the embodiment of the present invention
Really simulation drawing；
A kind of making side realizing the stealthy phonon functional structure of underwater sound wave orientation that Fig. 5 provides for the embodiment of the present invention
The flow chart of method.
Detailed description of the invention
Embodiments of the present invention are described below in detail, and the example of described embodiment is shown in the drawings, the most ad initio
Represent same or similar element to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment examining accompanying drawing description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
A kind of vertical view realizing the stealthy phonon functional structure of underwater sound wave orientation that Fig. 1 provides for the embodiment of the present invention
Figure；A kind of schematic perspective view realizing the stealthy phonon functional structure of underwater sound wave orientation that Fig. 2 provides for the embodiment of the present invention；
Fig. 3 is the schematic diagram of the unit cell realizing the stealthy phonon functional structure of underwater sound wave orientation in Fig. 1；Fig. 4 is the embodiment of the present invention
A kind of stealth effect simulation drawing realizing the stealthy phonon functional structure of underwater sound wave orientation provided；Below in conjunction with Fig. 1-Fig. 4
Describe.
Described a kind of underwater sound wave that realizes orients stealthy phonon functional structure, including:
Alloy matrix aluminum 11；
The through hole according to plane positive triangular crystal lattice periodic arrangement, described through hole edge it is drilled with on described alloy matrix aluminum 11
Z-direction runs through described alloy matrix aluminum.
The centre of described alloy matrix aluminum 11 is provided with the cavity 12 running through described alloy matrix aluminum along Z-direction, is used for
Place target to be concealed.
The diameter of described cavity is less than or equal to the half of described alloy matrix aluminum width along the y-axis direction.
Described through hole includes: regular hexagon hole 13；
Each limit of described regular hexagon hole 13 connects T-shaped hole 14.
Described alloy matrix aluminum is symmetrical along X-direction；
The size of described regular hexagon hole is along Y direction distribution gradient, the refractive index ladder of described regular hexagon hole
Spending along Y direction is hyperbolic secant distribution；
Described regular hexagon hole is distribution in the same size along X-direction, and the refractive index of described regular hexagon hole is along X-axis
Direction is uniformly distributed.
When stealthy frequency is 25kHz, the density of described alloy matrix aluminum is ρ=2.7g/cm3；Described alloy matrix aluminum
Longitudinal wave velocity and transverse wave speed be respectively cl=6.15km/s and ct=3.1km/s；
Lattice paprmeter a=20mm of described regular hexagon hole；Described alloy matrix aluminum length L=in the X-axis direction
24a；
The size of described T-shaped hole is respectively as follows: the cross-drilled hole border to the unit cell of described alloy matrix aluminum of T-shaped hole
Distance b=0.0275a, length e=0.32a of the cross-drilled hole of T-shaped hole, the width h=0.06a of the cross-drilled hole of T-shaped hole
Width t=0.05a with the vertical core of T-shaped hole；
The aperture d of described regular hexagon hole is followed successively by 0.5a, 0.507a, 0.526a, 0.556a along the size of y-axis,
0.594a,0.636a,0.68a。
Described stealthy frequency is to change in equal proportion with the size of described lattice paprmeter a；
The cross-drilled hole of the cross-drilled hole of T-shaped hole extremely distance b on border of unit cell of described alloy matrix aluminum, T-shaped hole
Width h, the reduction of width t of vertical core of T-shaped hole make stealthy frequency reduce, subtracting of length e of the cross-drilled hole of T-shaped hole
Little stealthy frequency is made to raise.
Described alloy matrix aluminum is at least ten times that thickness is described lattice paprmeter of Z-direction.
Embodiment is below described.
A kind of can realize the underwater sound wave stealthy phonon functional structure of orientation, by refractive index distribution gradient and be drilled with week
The aluminum alloy materials of phase through hole is made.This periodic structure is triangular shaped periods arrangement, there are six axis of symmetry；Equifrequent curve
Present close to isotropic feature；
The present invention is to get out the through hole of Gradient distribution on aluminum substrate and form according to triangular crystal lattice arrangement.Through hole is
Collectively constituted by " T " font hole of regular hexagon hole and each Bian Shang UNICOM；
The size distribution gradient of regular hexagon hole, and the refractive index of its correspondence also distribution gradient；Particularly as follows: refraction
Rate gradient is controlled by the size of regular hexagon hole；Refractive index gradient is hyperbolic secant distribution along y-axis, is uniformly to divide along x-axis
Cloth.
Structure is high with the impedance match of water, it is possible to realize high-transmission rate.
Particularly as follows: in phonon functional material band structure figure, abscissa is wave vector, vertical coordinate is frequency.Hidden determining
Needed for body after frequency (frequency needs to choose on the Article 4 band of band structure), wave vector corresponding to this frequency it is also determined that
?.When regular hexagon varying aperture, the wave vector corresponding to this frequency also can change.When the size of wave vector is double along y-axis
During bent secant distribution, refractive index gradient is also distributed in hyperbolic secant.Refractive index with the relational expression of y-coordinate is: n (y)=n0sech
(δy)(n0Refractive index for during y=0).Wherein, hyperbolic secant distribution gradient index δ by length L of porous plate (along x-axis side
To) determine, relational expression is: δ=π/L.
As it is shown in figure 5, orient the making of stealthy phonon functional structure for a kind of underwater sound wave that realizes of the present invention
Method, including:
Step 210, selects an alloy matrix aluminum；
Step 220, cuts out the through hole according to plane positive triangular crystal lattice periodic arrangement, institute on described alloy matrix aluminum
State through hole and run through described alloy matrix aluminum along Z-direction.
The manufacture method of described phonon functional structure, also includes:
Step 230, cuts out the cavity running through described alloy matrix aluminum, is used for placing in the centre of described alloy matrix aluminum
Target to be concealed.
The manufacture method of described phonon functional structure, also includes:
Step 240, will cut out alloy matrix aluminum bonding described at least two of described through hole so that the institute after bonding
State alloy matrix aluminum thickness is lattice paprmeter at least ten times of z-axis direction.
Embodiment is below described.
A kind of manufacture method that can realize the stealthy phonon functional structure of underwater sound wave orientation, comprises the following steps:
Step 1: select the aluminium alloy plate of suitable material parameter and thickness；Aluminium alloy density as selected by present case be ρ=
2.7g/cm3, compressional wave and transverse wave speed are respectively cl=6.15km/s and ct=3.1km/s.Its material parameter is not completely fixed,
Can change in less scope.The thickness of slab that aluminium alloy thickness of slab can run through according to Water Cutting equipment is chosen (general
Within 80mm).
Step 2: the method using Water Cutting, requires to cut out through hole according to gradient design on aluminium alloy plate；Unit cell
Cross section geometry as it is shown on figure 3, lattice paprmeter (distance between adjacent aperture centers) is a=20mm.Except regular hexagon hole
Beyond the d of footpath, remaining four parameter is respectively b=0.0275a, e=0.32a, h=0.06a and t=0.05a.Hole along the y-axis direction
The size of footpath d is by designing stealthy frequency and plate length decision in the direction of the x axis, and aperture is not changed in along the x-axis direction.Embodiment
In to choose stealthy frequency be 25kHz, a length of L=24a of plate, then regular hexagon aperture d is followed successively by 0.5a along the size of y-axis,
0.507a,0.526a,0.556a,0.594a,0.636a,0.68a.Wherein, the size of stealthy frequency and lattice paprmeter a be in etc.
Ratio change.The change of remaining four parameter also can cause the change of stealthy frequency, and such as b, the reduction of h, t can cause stealthy frequency
The reduction of rate, and the reduction of e can make stealthy frequency raise.Fig. 1 and Fig. 2 is respectively unitary construction figure and three-dimensional structural map.Fig. 1 and
The circular cavity that Fig. 2 center cuts out is stealthy region, and the diameter of cavity is not more than the half of plate width (along the y-axis direction).
Step 3: porous Al alloy plate is glued together.Bonding front face to polish flat, and gluing is wanted uniformly, to prevent
Degumming and bonding are loosely.Particularly as follows: owing to thickness of slab is had certain limitations by Water Cutting, plane strain problems requires in z-axis direction
Thickness of slab reaches the lattice paprmeter of ten times, it is therefore desirable to be glued together to meet thickness by manufactured for multilamellar porous Al alloy plate
Requirement.This porous plate is two-dimension phonon functional structure.
The invention has the beneficial effects as follows:
The present invention direction of propagation by direct sound waves, such that it is able to allow immersed body hide in a certain direction sonar or
The detection of other ultrasonic instrument, thus it is stealthy to realize underwater sound wave in the range of certain frequency, helps submarine etc. to set under water
The standby detection hiding active sonar；
The structure of the present invention is high with the impedance match of water, it is possible to realize high-transmission rate；
The structure of the present invention only need to be holed on alloy matrix aluminum and be obtained, and processing is simple.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement,
All should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is as the criterion.
Claims (10)
1. realize the phonon functional structure that underwater sound wave orientation is stealthy, including:
Alloy matrix aluminum；
Being drilled with the through hole according to plane positive triangular crystal lattice periodic arrangement on described alloy matrix aluminum, described through hole is along Z axis side
To running through described alloy matrix aluminum.
Phonon functional structure the most according to claim 1, it is characterised in that:
The centre of described alloy matrix aluminum is provided with the cavity running through described alloy matrix aluminum along Z-direction, treats hidden for placement
Hide target.
Phonon functional structure the most according to claim 1, it is characterised in that
The diameter of described cavity is less than or equal to the half of described alloy matrix aluminum width along the y-axis direction.
Phonon functional structure the most according to claim 1, it is characterised in that:
Described through hole includes: regular hexagon hole；
Each limit of described regular hexagon hole connects T-shaped hole.
Phonon functional structure the most according to claim 4, it is characterised in that:
Described alloy matrix aluminum is symmetrical along X-direction；
The size of described regular hexagon hole is along Y direction distribution gradient, and the refractive index gradient of described regular hexagon hole is along Y
Direction of principal axis is hyperbolic secant distribution；
Described regular hexagon hole is distribution in the same size along X-direction, and the refractive index of described regular hexagon hole is along X-direction
It is uniformly distributed.
Phonon functional structure the most according to claim 5, it is characterised in that
When stealthy frequency is 25kHz, the density of described alloy matrix aluminum is ρ=2.7g/cm3；The compressional wave of described alloy matrix aluminum
Velocity of wave and transverse wave speed are respectively cl=6.15km/s and ct=3.1km/s；
Lattice paprmeter a=20mm of described regular hexagon hole；Described alloy matrix aluminum length L=24a in the X-axis direction；
The size of described T-shaped hole be respectively as follows: the cross-drilled hole of T-shaped hole to the unit cell of described alloy matrix aluminum border away from
From b=0.0275a, length e=0.32a of the cross-drilled hole of T-shaped hole, the width h=0.06a of the cross-drilled hole of T-shaped hole and T word
The width t=0.05a of the vertical core of shape hole；
The aperture d of described regular hexagon hole is followed successively by 0.5a, 0.507a, 0.526a, 0.556a, 0.594a along the size of y-axis,
0.636a,0.68a。
Phonon functional structure the most according to claim 6, it is characterised in that
Described stealthy frequency is to change in equal proportion with the size of described lattice paprmeter a；
The cross-drilled hole of T-shaped hole is to distance b on border of unit cell of described alloy matrix aluminum, the width of the cross-drilled hole of T-shaped hole
H, the reduction of width t of vertical core of T-shaped hole make stealthy frequency reduce, and the reduction of length e of the cross-drilled hole of T-shaped hole makes
Stealthy frequency raises.
Phonon functional structure the most according to claim 1, it is characterised in that
Described alloy matrix aluminum is at least ten times that thickness is described lattice paprmeter of Z-direction.
9. the manufacture method realizing the stealthy phonon functional structure of underwater sound wave orientation, it is characterised in that including:
Select an alloy matrix aluminum；
Cutting out the through hole according to plane positive triangular crystal lattice periodic arrangement on described alloy matrix aluminum, described through hole is along Z
Direction of principal axis runs through described alloy matrix aluminum；
Alloy matrix aluminum bonding described at least two of described through hole will be cut out so that the described alloy matrix aluminum after bonding
In z-axis direction thickness is lattice paprmeter at least ten times.
The manufacture method of phonon functional structure the most according to claim 9, it is characterised in that also include:
Cut out the cavity running through described alloy matrix aluminum in the centre of described alloy matrix aluminum, be used for placing target to be concealed.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108845291A (en) * | 2018-06-12 | 2018-11-20 | 江苏大学 | A kind of underwater sound source positioning system and method based on phonon crystal sensing |
| CN110880312A (en) * | 2018-09-05 | 2020-03-13 | 湖南大学 | Underwater sub-wavelength local resonance type acoustic metamaterial |
| CN115602141A (en) * | 2022-11-16 | 2023-01-13 | 青岛国数信息科技有限公司（Cn） | Active acoustic stealth method for frogman |
| CN116956688A (en) * | 2023-07-31 | 2023-10-27 | 中国船舶集团有限公司第七一九研究所 | Five-mode metamaterial cell and design method thereof |
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| US8836792B1 (en) * | 2010-12-13 | 2014-09-16 | Image Acoustics, Inc. | Active cloaking with transducers |
| CN103046480A (en) * | 2011-10-11 | 2013-04-17 | 无锡市德林环保工程有限公司 | Complete aluminum pierced noise-absorbing plate |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108845291A (en) * | 2018-06-12 | 2018-11-20 | 江苏大学 | A kind of underwater sound source positioning system and method based on phonon crystal sensing |
| CN110880312A (en) * | 2018-09-05 | 2020-03-13 | 湖南大学 | Underwater sub-wavelength local resonance type acoustic metamaterial |
| CN110880312B (en) * | 2018-09-05 | 2023-10-27 | 湖南大学 | Underwater sub-wavelength local resonance type acoustic metamaterial |
| CN115602141A (en) * | 2022-11-16 | 2023-01-13 | 青岛国数信息科技有限公司（Cn） | Active acoustic stealth method for frogman |
| CN115602141B (en) * | 2022-11-16 | 2023-03-10 | 青岛国数信息科技有限公司 | Active acoustic stealth method for frogman |
| CN116956688A (en) * | 2023-07-31 | 2023-10-27 | 中国船舶集团有限公司第七一九研究所 | Five-mode metamaterial cell and design method thereof |
| CN116956688B (en) * | 2023-07-31 | 2023-12-22 | 中国船舶集团有限公司第七一九研究所 | Five-mode metamaterial cell and design method thereof |
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