CN105070285A - Direction controllable sound reinforcement transmission device - Google Patents
Direction controllable sound reinforcement transmission device Download PDFInfo
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- CN105070285A CN105070285A CN201510500563.1A CN201510500563A CN105070285A CN 105070285 A CN105070285 A CN 105070285A CN 201510500563 A CN201510500563 A CN 201510500563A CN 105070285 A CN105070285 A CN 105070285A
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Abstract
The invention discloses a direction controllable sound reinforcement transmission device, comprising a sound wave generation device, a metal hollow cylinder and water. A circular column sound source generation device is positioned in a metal hollow circular column and is used for generating a cylindrical surface sound wave; the metal hollow cylinder is immersed in the water; the inner diameter of the metal hollow cylinder is r=1.5 Mum-1.5m, and the outer diameter is R=2.0Mum-2.0m. The sound reinforcement transmission device is based on the sound reinforcement transmission effect of the hollow cylinder structure; the sound pressure amplitude on the outside of the metal hollow cylinder is increased by 20 times, and the transmission direction of the waveform is constant; the frequency range of the sound reinforcement transmission is wide, and the used frequency range is 100Hz-1GHz; and the sound transmission energy magnitude, switching on and off, and the emergent direction can be controlled through adjusting the position of a cylinder sound source generation device inside the metal hollow cylinder. The direction controllable sound reinforcement transmission device is simple in structure, medium in size, easy to process and integrate, and is used in the medical science ultrasonic detection device, a confidential sound communication emitter and a sound wave detector.
Description
Technical field
The invention belongs to acoustic metamaterial field, the sound enhancing transmission device that especially a kind of direction is controlled.
Background technology
Sound wave is energy carrier common in actual life, and sound wave, in communication process, can run into various reflecting object, and be affected, if sound wave is through reflecting object, sound wave can through reflecting object, and sound transmission energy flux density is further enhanced, is sound and strengthens reflected effect.Be achieved if sound strengthens reflected effect, then can apply to the various important events needing to realize acoustic energy Special controlling, such as: medical ultrasonic, secure communication, acoustic sounding etc.Therefore, the research of sound enhancing transmission device has very important learning value and application prospect.
The structure realizing sound enhancing transmission mainly contains following three kinds:
The first is design submergence periodic structure solid panel structure in a fluid, and single or periodic hole seam is set in solid panel, the Fabry-Perot resonance effects of being stitched by single hole, or the diffracting surface ripple of periodically hole seam generation is coupled with narrow slit wave-guide Fabry-Perot resonance mode, can obtain sound and strengthen reflected effect.
The second is the solid platelets structure that design submergence both sides in a fluid have same period grid, different from first method, there is not any hole seam in this solid platelets structure, under some characteristic frequency, sound wave can be excited by solid platelets structure and produce displacement eigenmodes, thus through solid platelets structure, acquisition sound strengthens reflected effect, and the phasmon mechanism that this mechanism and electromagnetic wave strengthen reflected effect is similar.
The third is the novel sound metamaterial structure of design, what copper coin and air as having some cycles formed curls space structure, pass through design of Structural Parameters, make to curl space structure identical with the acoustic impedance of outside air, thus make sound wave completely through curling space structure, realize sound and strengthen reflected effect.
The shortcoming of conventional art is:
(1) periodicity solid panel design hole or seam structure in, sound strengthens reflected effect and comes from the coupling at body structure surface of diffracting surface ripple and narrow slit wave-guide Fabry-Perot resonance mode, transmission acoustic energy mainly concentrates on solid panel body structure surface, distance solid panel remotely, almost there is no transmission acoustic energy, therefore, transmission acoustic energy cannot be propagated, thus cannot be used.
(2) above-mentioned three kinds of sound enhancing transmission device is periodic structure, obtain sound and strengthen reflected effect, need certain periodicity, thus causes device size comparatively large, and structure is more complicated, not easily manufactures.
(3) the sound transmission energy position that traditional sound strengthens transmission device is single, and the exit direction that uncontrollable transmission can be flowed, has certain limitation in actual applications.
Summary of the invention
For the sound transmission concentration of energy in traditional sound enhancing transmission device at body structure surface, complex structure, size are large, sound transmission energy cannot the defect such as direction propagation, and the present invention proposes a kind of sound and strengthens the sound that transmission effects is excellent, frequency coverage is wide, structure is simple and easy to realize, transmission potential direction is controlled and strengthen transmission device.
The present invention realizes above-mentioned technical purpose by following technological means.
The sound enhancing transmission device that direction is controlled, comprise cylinder sound source generating means, hollow metal cylinder and water, described hollow metal cylinder is immersed in water, and cylinder sound source generating means is arranged in hollow metal cylinder, for sending cylinder sound wave; Internal diameter r=1.5 μm ~ 1.5m, external diameter R=2.0 μm ~ 2.0m of described hollow metal cylinder.
Preferably, position-movable being arranged in hollow metal cylinder of described cylinder sound source generating means.
Preferably, the material of described hollow metal cylinder is one or more the alloy material in copper, iron, steel, aluminium, zinc, gold, silver, nickel.
Preferably, the cross sectional shape of described metal hollow post is circular or oval.
The invention has the beneficial effects as follows:
(1) sound enhancing transmission effects is good
Hollow metal cylinder is immersed in water, the inside and outside both sides of metal cylinder are all water, in some specific frequencies, when cylinder sound source is from hollow metal cylinder center or more inner specific positions to external radiation, outside hollow metal cylinder, reflected effect can be strengthened by generation sound.Adopt Finite Element Method numerical simulation sound wave to strengthen transmission performance, confirm that sound proposed by the invention strengthens transmission device, compared with free space, the sound pressure amplitude outside hollow metal cylinder increases nearly 20 times, and the direction of propagation of waveform is constant.
(2) frequency range of sound enhancing transmission is wide
Sound proposed by the invention strengthens transmission device, and sound strengthens the frequency of transmission and the overall dimensions of hollow metal cylinder is inversely proportional to, and when hollow metal cylinder entirety reduces, sound strengthens frequencies of transmission and increases, can up to nearly 1GHz; When hollow metal cylinder size is amplified, sound strengthens frequencies of transmission and reduces, and can be low to moderate 100Hz; The scope of frequency is between 100Hz ~ 1GHz, and therefore, sound strengthens the wide range of frequencies of transmission.
(3) difform metal hollow column structure is applicable to
Sound proposed by the invention strengthens transmission device, and the sound based on column structure strengthens reflected effect, can adopt circle and elliptical cylinder structure, applied widely.
(4) sound transmission energy size, switch, exit direction are controlled
Sound proposed by the invention strengthens transmission device, by regulating the position of hollow metal cylinder inner cylinder sound source generating means, controls the size of sound transmission energy, switch and exit direction.
(5) device architecture is simple, easily processes
Hollow metal cylinder proposed by the invention is that deformation based eigenmodes strengthens reflected effect, compared with strengthening transmission device with traditional deformation based eigenmodes sound to realize sound, structure is simple, and moderate dimensions, easily processes preparation, easy of integration, be conducive to applying.
Sound wave of the present invention strengthens transmission device, can be used in medical ultrasonic detecting instrument (B ultrasonic), secret acoustic communication transmitter, acoustic detector.
Accompanying drawing explanation
Fig. 1 is the three-dimensional structure schematic diagram that sound wave of the present invention strengthens transmission device;
Fig. 2 sound wave strengthens the two-dimensional section figure of the x-y plane of transmission device;
Fig. 3 frequency is the sound pressure amplitudes distribution that 160.39kHz cylinder sound wave excites (a) free space and (b) brass hollow cylinder to produce;
Fig. 4 frequency is the sound pressure phase distribution that 160.39kHz cylinder sound wave excites (a) free space and (b) brass hollow cylinder to produce;
Fig. 5 frequency is the displacement deformation figure that 160.39kHz cylinder sound wave excites brass hollow cylinder to produce;
Fig. 6 frequency is that the sound pressure amplitudes that (a) 209.71kHz and (b) 259.02kHz cylinder sound wave excite brass hollow cylinder to produce distributes;
The sound pressure amplitudes distribution that Fig. 7 cylinder sound wave excites brass hollow cylinder to produce: (a) R=2.0 μm, r=1.5 μm, frequency is 1603.9MHz; (b) R=2.0m, r=1.5m, frequency is 1604Hz;
The sound pressure amplitudes distribution that Fig. 8 cylinder sound wave excites the hollow cylinder of different materials to produce: (a) steel cylinder, frequency is 160.58kHz; (b) aluminium cylinder, frequency is 161.53kHz;
Fig. 9 frequency is that the sound pressure amplitudes that (a) 67.84kHz and (b) 123.11kHz cylinder sound wave excite brass hollow ellipse post to produce distributes;
Figure 10 frequency is the sound pressure amplitudes distribution that 160.39kHz cylinder sound wave excites brass hollow cylinder to produce: cylinder sound source position is (a) A point (5.70mm in hollow cylinder respectively, 0), (b) B point (8.17mm, 0);
Figure 11 frequency is the sound pressure amplitudes distribution that 134.81kHz cylinder sound wave excites brass hollow cylinder to produce: cylinder sound source position is (a) A point (3.10mm in hollow cylinder respectively, 0), (b) B point (2.19mm, 2.19mm), (c) C point (0,3.10mm);
Figure 12 frequency is the sound pressure amplitudes distribution plan that 106.47kHz cylinder sound wave excites brass hollow cylinder to excite: cylinder sound source position is (a) A point (6.82mm in hollow cylinder respectively, 0), (b) B point (4.82mm, 4.82mm).
In figure:
1-cylinder sound source generating means, 2-hollow metal cylinder.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further illustrated, but protection scope of the present invention is not limited to this.
Sound of the present invention strengthens transmission device, comprise cylinder sound source generating means 1, hollow metal cylinder 2 and water, cylinder sound source generating means 1 is arranged in hollow metal cylinder 2, described hollow metal cylinder 2 is immersed in water, internal diameter r=1.5 μm ~ 1.5m, external diameter R=2.0 μm ~ 2.0m of described hollow metal cylinder 2.
Described sound strengthens transmission device, sound based on ring texture strengthens reflected effect, the material of described hollow metal cylinder 2 can be selected as copper, iron, steel, aluminium, zinc, gold, silver, nickel or its alloy material, hollow cylinder and hollow ellipse rod structure can be adopted, that is, the cross sectional shape of described metal hollow post 2 is circular or oval.Sound pressure amplitude outside metal cylinder increases nearly 20 times, and the direction of propagation of waveform is constant.The frequency range that sound strengthens transmission is very wide, and the frequency range of use is 100Hz ~ 1GHz.
Position-movable for described cylinder sound source generating means 1 being arranged in hollow metal cylinder 2, by regulating the position of hollow metal cylinder 2 inner cylinder sound source generating means 1, controlling the size of sound transmission energy, switch and exit direction.
The sound strengthening transmission device in order to examine sound of the present invention strengthens transmission effects, adopts Finite Element Method numerical simulation sound wave to strengthen transmission performance, simulation process and result specific as follows:
Embodiment 1
Fig. 1 is that sound wave of the present invention strengthens the three-dimensional structure schematic diagram of transmission device, in order to simplify calculating, according to the column symmetry of hollow metal cylinder 2 and cylinder sound source, is reduced to the two dimensional model of x-y plane, as shown in Figure 2.Employing finite element numerical method establishment is immersed in hollow metal cylinder 2 model in water, calculates sound wave and strengthens transmission performance.The material selection brass of wherein said hollow cylinder; External diameter R=20.0mm, internal diameter r=15.0mm; Material parameter is respectively: the density 8400kg/m of brass
3, velocity of longitudinal wave 4400m/s and shear wave velocity 2200m/s; The density 998kg/m of water
3and velocity of sound 1483m/s.Excite sound source to be cylinder sound source, its position is positioned at hollow cylinder center.
The sound pressure amplitudes distribution plan that Fig. 3 (a) and 3 (b) excite free space and brass hollow cylinder to produce for 160.39kHz cylinder sound wave, cylinder sound source is positioned at center (0, the 0) position of hollow cylinder, initial magnitude (| p
0|) represent the relative magnitude of acoustic pressure for solid white line in 1Pa, figure | p/p
0| isoline.Can find out, in free space, as shown in Fig. 3 (a), the acoustic pressure relative magnitude of central point is 1, and along with propagation distance increases, the acoustic pressure relative magnitude of sound wave sharply reduces, and at x=25.0mm, the relative magnitude of acoustic pressure only remains 0.075.In brass hollow cylinder, as shown in Fig. 3 (b), sound wave and brass hollow cylinder interact, produce a circular focus at brass hollow cylinder center, and the acoustic pressure relative magnitude of focus center is up to 160, that is: outside hollow cylinder, the relative magnitude of transmitted acoustic pulse obviously increases, work as x=25.0mm, acoustic pressure relative magnitude reaches 1.5, is 25 times of acoustic pressure relative magnitude in free space.
Fig. 4 (a) and 4 (b) are the sound pressure phase distribution plan in free space and brass hollow cylinder.Can find out, incident cylinder sound wave shown in Fig. 4 (b) is by the PHASE DISTRIBUTION of brass hollow cylinder, identical with the PHASE DISTRIBUTION in free space shown in Fig. 4 (a), phase place isoline is donut, illustrate that incident cylinder sound wave is through after brass hollow cylinder, the direction of propagation is constant.
Fig. 5 is the displacement deformation figure that 160.39kHz cylinder sound wave excites brass hollow cylinder to produce, and black arrow represents the direction of vibration of displacement eigenmodes in hollow cylinder.Can find out, the direction of vibration of displacement eigenmodes all along brass hollow cylinder radially outward, under displacement eigenmodes effect in brass hollow cylinder, incident cylinder sound wave can propagate into cylindrical outer side through brass hollow cylinder, and the direction of propagation is constant, along brass hollow cylinder radially outward.Therefore, the sound wave in column structure strengthens reflected effect and is caused by displacement eigenmodes in brass hollow cylinder.
Except frequency 160.39kHz, brass hollow cylinder also can realize sound in other multiple frequencies and strengthen reflected effect.Fig. 6 (a) and 6 (b) represent that frequency is the sound pressure amplitudes distribution plan that the cylinder sound wave of 209.71kHz and 259.02kHz excites brass hollow cylinder to produce respectively, can find out, compared with Fig. 3 (a) free space, the acoustic pressure relative magnitude of cylindrical outer side equally obviously strengthens.
Can obtain from the result of Fig. 3 and Fig. 6: when the structural parameters of brass hollow cylinder are R=20.0mm and r=15.0mm, sound strengthens reflected effect and appears at 160.39kHz, 209.71kHz and 259.02kHz respectively.
Embodiment 2
Now keep the material parameter of brass and water constant, the interior external radius of change brass hollow cylinder, the frequency that sound strengthens transmission can change.As shown in Fig. 7 (a) He 7 (b), the geometric parameter of brass hollow cylinder be R=2.0 μm with r=1.5 μm time, the frequency of sound enhancing transmission can up to 1603.9MHz, and when the geometric parameter of brass hollow cylinder is R=2.0m and r=1.5m, the frequency that sound strengthens transmission can be low to moderate 1604Hz.Compared with the geometric parameter of brass hollow cylinder in Fig. 3 (b) and frequency, sound strengthens the frequency of transmission and is inversely proportional to the overall dimensions of column structure, and when brass hollow cylinder entirety reduces, sound strengthens the frequency increase of transmission; When brass open circles Column scale-up, the frequency that sound strengthens transmission reduces.Illustrate that open column shape structure proposed by the invention strengthens frequencies of transmission wide range, as long as the overall dimensions of adjustment open column shape structure, the sound that can obtain different frequency strengthens reflected effect.
Embodiment 3
Except brass, the sound based on open column shape structure proposed by the invention strengthens reflected effect also other metal materials applicable.Fig. 8 (a) and 8 (b) represent that frequency is the sound pressure amplitudes distribution plan that the cylinder sound wave of 160.58kHz and 161.53kHz excites steel cylinder and aluminium cylinder to produce respectively respectively.The geometric parameter of hollow metal cylinder 2 is identical with Fig. 3, and material parameter is respectively: the density 7800kg/m of steel
3, velocity of longitudinal wave 6100m/s and shear wave velocity 3300m/s; The density 2700kg/m of aluminium
3, velocity of longitudinal wave 6260m/s and shear wave velocity 3080m/s.Can find out, incident cylinder sound wave excites from hollow cylinder, strengthens reflected effect equally at cylindrical outer side generation sound.The applicable multiple different metal material of column structure proposed by the invention is described.
Embodiment 4
In addition, except circular metal hollow cylinder 2, sound proposed by the invention strengthens reflected effect also applicable hollow ellipse rod structure.Fig. 9 (a) and 9 (b) represent the sound pressure amplitudes distribution plan that 67.84kHz and 123.11kHz column sound wave excites brass hollow ellipse post and produces respectively.Cylindroid geometric parameter is respectively: b
1=12.0mm, b
2=15.0mm, b
3=18.0mm and b
4=20.0mm.Can find out, incident cylinder sound wave excites at cylindroid center, and outside cylindroid, generation sound strengthens reflected effect equally.Illustrate that sound proposed by the invention strengthens reflected effect and is applicable to hollow ellipse rod structure.
Embodiment 5
Excite the position of cylinder sound source to be all arranged on the center of column structure in Fig. 3-Fig. 9, below cylinder sound source is arranged on other positions of column structure inside by us.
Figure 10 represents the sound pressure amplitudes distribution plan that 160.39kHz column sound wave excites brass hollow cylinder to produce, incident cylinder sound wave lays respectively at A point and the B point of brass hollow cylinder internal deviation circle ring center position, and the geometric parameter of brass hollow cylinder is identical with embodiment 1.As Figure 10 (a), the coordinate of A point is (5.70mm, 0), be positioned on the maximum value striped of sound pressure amplitudes distribution, can find out, a focus is produced equally in cylindrical center, the acoustic pressure relative magnitude of focus center reaches 60, and the acoustic pressure relative magnitude of cylindrical outer side obviously strengthens, and reaches 0.55 at x=25.0mm, but with excite sound source compared with the cylindrical center shown in Fig. 3 (b), the acoustic pressure relative magnitude of cylindrical outer side obviously reduces.And in Figure 10 (b), the coordinate of B point is (8.17mm, 0), be positioned on the minimal value striped of sound pressure amplitudes distribution, now, the relative magnitude of cylindrical center's focus is 0.4, the acoustic pressure relative magnitude of cylindrical outer side is 0.02, does not occur that sound strengthens reflected effect.Illustrate and excite sound source position by what regulate hollow cylinder inside, control sound strengthens the power of reflected effect and switch.
Figure 11 represents the sound pressure amplitudes distribution plan that 134.81kHz column sound wave excites brass hollow cylinder to produce, and incident column sound wave lays respectively at the A point of brass hollow cylinder inside, B point and C point, and the geometric parameter of brass hollow cylinder is identical with embodiment 1.As Figure 11 (a), under this frequency, excite sound source to produce two focuses at brass cylindrical inside, and excite sound source position A point (3.10mm, 0) overlap with right side focus center, now sound transmission energy exit direction is cylindrical exterior 0 degree and 180 degree of directions.Now with the center (0 of hollow cylinder, 0) be reference point, sound source position A point will be excited to be rotated counterclockwise 45 degree and 90 degree, arrive B point and C point respectively, as Figure 11 (b) and 11 (c), can finding out, rotating along with exciting sound source position, inner two focal positions of brass hollow cylinder and sound transmission energy exit direction rotate equally, and the anglec of rotation is identical.
Figure 12 represents the sound pressure amplitudes distribution plan that 106.47kHz column sound wave excites brass hollow cylinder to produce, and incident column sound wave lays respectively at A point and the B point of brass hollow cylinder inside, and the geometric parameter of brass hollow cylinder is identical with embodiment 1.As Figure 12 (a), under this frequency, sound source is excited to produce 4 focuses in brass hollow cylinder inside, and excite sound source position A point (6.82mm, 0) overlap with right side focus center, now sound transmission energy exit direction is outside 0 degree of annulus, 90 degree, 180 degree and 270 degree of directions, now with the center (0 of cylinder, 0) be reference point, sound source position A point will be excited to be rotated counterclockwise 45 degree, arrive B point, as Figure 12 (b), can find out, rotate along with exciting sound source position, 4 focal positions and the sound transmission energy exit direction of brass cylindrical inside rotate equally, and the anglec of rotation is identical.Illustrate by regulating the excitaton source anglec of rotation of cylindrical inside to control sound transmission energy exit direction.
Described embodiment is the preferred embodiment of the present invention; but the present invention is not limited to above-mentioned embodiment; when not deviating from flesh and blood of the present invention, any apparent improvement that those skilled in the art can make, replacement or modification all belong to protection scope of the present invention.
Claims (4)
1. the sound enhancing transmission device that a direction is controlled, it is characterized in that, comprise cylinder sound source generating means (1), hollow metal cylinder (2) and water, described hollow metal cylinder (2) is immersed in water, cylinder sound source generating means (1) is arranged in hollow metal cylinder (2), for sending cylinder sound wave; Internal diameter r=1.5 μm ~ 1.5m, external diameter R=2.0 μm ~ 2.0m of described hollow metal cylinder (2).
2. sound according to claim 1 strengthens transmission device, it is characterized in that, position-movable being arranged in hollow metal cylinder (2) of described cylinder sound source generating means (1).
3. sound according to claim 1 strengthens transmission device, and it is characterized in that, the material of described hollow metal cylinder (2) is one or more the alloy material in copper, iron, steel, aluminium, zinc, gold, silver, nickel.
4. sound according to claim 1 strengthens transmission device, it is characterized in that, the cross sectional shape of described metal hollow post (2) is circular or oval.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105750181A (en) * | 2016-03-11 | 2016-07-13 | 南京大学 | Device for generating acoustic vortex field by utilizing acoustic metamaterial |
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| US20060056275A1 (en) * | 2003-12-12 | 2006-03-16 | Deangelis Matthew M | Acoustic projector and method of manufacture |
| CN101103392A (en) * | 2005-01-14 | 2008-01-09 | 英国国防部 | An acoustic reflector |
| CN102016979A (en) * | 2008-04-02 | 2011-04-13 | 英国国防部 | Tunable acoustic reflector |
| CN102625945A (en) * | 2009-07-29 | 2012-08-01 | 海底资产定位科技有限公司 | Acoustic reflectors |
| CN104505088A (en) * | 2015-01-08 | 2015-04-08 | 江苏大学 | Acoustic wave focusing device based on intrinsic displacement mode |
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2015
- 2015-08-14 CN CN201510500563.1A patent/CN105070285B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060056275A1 (en) * | 2003-12-12 | 2006-03-16 | Deangelis Matthew M | Acoustic projector and method of manufacture |
| CN101103392A (en) * | 2005-01-14 | 2008-01-09 | 英国国防部 | An acoustic reflector |
| CN102016979A (en) * | 2008-04-02 | 2011-04-13 | 英国国防部 | Tunable acoustic reflector |
| CN102625945A (en) * | 2009-07-29 | 2012-08-01 | 海底资产定位科技有限公司 | Acoustic reflectors |
| CN104505088A (en) * | 2015-01-08 | 2015-04-08 | 江苏大学 | Acoustic wave focusing device based on intrinsic displacement mode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105750181A (en) * | 2016-03-11 | 2016-07-13 | 南京大学 | Device for generating acoustic vortex field by utilizing acoustic metamaterial |
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