CN109147755A - It is a kind of can the artificial surface acoustic wave of high-efficiency transfer acoustic waveguide and its design method - Google Patents
It is a kind of can the artificial surface acoustic wave of high-efficiency transfer acoustic waveguide and its design method Download PDFInfo
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- CN109147755A CN109147755A CN201810820482.3A CN201810820482A CN109147755A CN 109147755 A CN109147755 A CN 109147755A CN 201810820482 A CN201810820482 A CN 201810820482A CN 109147755 A CN109147755 A CN 109147755A
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- rectangular channel
- artificial surface
- surface acoustic
- wave
- acoustic wave
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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
- G10K11/36—Devices for manipulating acoustic surface waves
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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
Abstract
The invention discloses it is a kind of can the artificial surface acoustic wave of high-efficiency transfer acoustic waveguide and its design method, be made of rectangular channel cellular construction and an additional transition structure, be that metal material is made.Rectangular channel cellular construction has the thickness of sub-wavelength, it can change the transmission characteristic of artificial surface acoustic wave by adjusting the width of slot, depth and thickness, while transition structure can be converted to artificial surface acoustic wave for the volume wave from sound source is efficient in a broadband.The acoustic waveguide can not only the artificial surface acoustic wave of high-efficiency transfer, can also realize simultaneously to the conversion of the high efficiency of volume wave and surface wave, the cost of traditional SAW device can be reduced, promote the development of SAW device and acoustical device.
Description
Technical field
The invention belongs to artificial surface acoustic wave, acoustical device and novel artificial acoustical material fields, and in particular to Yi Zhongneng
Enough high efficiency generate artificial surface acoustic wave, while regulating and controlling the acoustic waveguide of its transmission characteristic.
Background technique
Traditional surface acoustic wave (surface acoustic waves, SAW) refers to and generates simultaneously edge on elastic free surface
The wave for the various modes that surface or interface are propagated, including Ruili wave (Rayleigh wave), Love wave (Love wave) etc., lead to
Often according to the mode of vibration of SAW, to inside elastic solid (Hookean body) penetration depth and used boundary condition come distinguish its type with
Mode.The propagation characteristic of this surface acoustic wave depends on the material parameter of its transmission medium.Nowadays using made by piezoelectric material
SAW device be widely used in our daily life.For example, the amplitude and spread speed of SAW are highly prone to material
The influence for expecting parameter, can produce the sensors such as temperature, pressure using this feature.In addition, using the propagation characteristic of SAW,
Can also make filter, frequency mixer etc. processing signal device, these devices have the advantages that it is small in size, be easily integrated.
Recently, with the development of novel acoustic material, acoustic metamaterial has become people with its special characteristic and studies
Hot spot, the appearance of acoustic metamaterial provides new development opportunity for SAW device and acoustical device.The concept of acoustic metamaterial
It, can be real by the way that well-designed structural unit is carried out periodical or acyclic arrangement from electromagnetism Meta Materials
The acoustics and electromagnetic property that existing many nature materials cannot achieve, such as against doppler phenomenon, negative index, super-resolution
Imaging etc..Different from traditional material, acoustic metamaterial design tends not to restriction by material system, with high flexible
Property, it can realize that traditional material cannot reach or be difficult to realize by the selection of basis material and the design of structural unit
Function.Under the inspiration of the theory of acoustic metamaterial, a kind of new surface acoustic wave --- artificial surface acoustic wave (spoof SAW,
SSAW researcher's note that this SSAW is propagated along the surface of artificial cycle structure) is caused, propagation characteristic depends on
The geometric parameter of the periodic structure.These periodic structures have the size of sub-wavelength, by adjusting these periodic structures
The adjustable SSAW of geometric parameter dispersion characteristics, and then achieve the purpose that adjust its propagation characteristic.2014, Han Jia
Et al. discovery, gradually deepened and the identical rectangular channel of depth by being cut into width on a metal plate, be may be implemented different frequencies
The purpose of the SSAW separation of rate.2013, Yangtao Ye et al. discovery was punched, on a metal plate by controlling this some holes
The purpose for focusing SSAW may be implemented in size.These researchs show that SSAW can become the new way of regulation sound wave.
But existing SSAW device is often very thick and bulky, is not easy to integrate, this is significantly limited
The development of SSAW device.
Summary of the invention
In order to reduce the cost of conventional SAW device, promote the development of SAW device and acoustical device, proposing one kind can be high
The acoustic waveguide and its design method of the artificial surface acoustic wave of efficiency transmission have high application prospect in field of acoustics.
The invention discloses it is a kind of can the artificial surface acoustic wave of high-efficiency transfer acoustic waveguide, including acoustic line structure and set
The transition apparatus in acoustic line structure two sides is set, the acoustic line structure includes along several rectangular channel lists linearly arranged
Member, the transition apparatus include hollow, rectangular pipeline and grading structure, and the grading structure includes the rectangle that depth is successively deepened
The metal plate of slot and arcuate structure, which is arranged in rectangular channel upper end, and the grading structure is connected with acoustic line structure.
Wherein, acoustic line structure and transition apparatus are metalwork.
Wherein, rectangular channel cellular construction has the thickness of sub-wavelength.
The invention also discloses it is a kind of can the artificial surface acoustic wave of high-efficiency transfer acoustic waveguide design method, including following step
It is rapid:
S1: according to the working frequency of sound wave, emulation meets the structure size of the rectangular channel unit of working frequency range；
S2: according to the size of required acoustic waveguide, by rectangular channel cellular construction along linear arrangement；
S3: the size and number by regulating and controlling rectangular channel cellular construction control the propagation characteristic of artificial surface acoustic wave；
S4: according to the size of rectangular channel unit, the size of transition structure is determined.
The geometric dimension for adjusting rectangular channel unit, can control the transmission characteristic of artificial surface acoustic wave, and transition structure can be high
Volume wave is converted to artificial surface acoustic wave by efficiency.
The utility model has the advantages that compared with prior art, the present invention acoustic waveguide of the invention have sub-wavelength thickness, can not only
Realize the regulation for artificial surface acoustic wave transmission characteristic, which can also pass through an efficient generation of transition apparatus
Artificial surface acoustic wave promotes the development of SAW device, has high application prospect in acoustical device field.
Detailed description of the invention
Fig. 1 is rectangular channel metal unit structure tomograph of the invention.
Fig. 2 is the dispersion curve of the rectangular channel cellular construction of different thickness of the invention.
Fig. 3 is the dispersion curve of the rectangular channel cellular construction of different width of the invention.
Fig. 4 is the dispersion curve of the rectangular channel cellular construction of different depth of the invention.
Fig. 5 is the overall structure diagram of acoustic waveguide of the invention.
Sound-filed simulation test result when Fig. 6 is 5500Hz, at the 2mm of acoustic waveguide surface.
Sound-filed simulation test result when Fig. 7 is 5800Hz, at the 2mm of acoustic waveguide surface.
Sound-filed simulation test result when Fig. 8 is 6100Hz, at the 2mm of acoustic waveguide surface.
Specific embodiment
The present invention is further explained with reference to the accompanying drawings and examples.
Embodiment 1
The present embodiment it is a kind of can the artificial surface acoustic wave of high-efficiency transfer acoustic waveguide, by rectangular channel cellular construction and one
Additional transition structure composition.Rectangular channel cellular construction has the thickness of sub-wavelength, and structure is as shown in Figure 1, by metal
Plate surface carves out rectangular recess and is made, and the material of rectangular channel cellular construction can be the metal materials such as brass, aluminium alloy.
The transmission characteristic of artificial surface acoustic wave is mainly by supporting the geometric parameter of the periodic cells structure of the surface wave to determine
It is fixed, it can be by the geometric parameter of the dispersion curve observation unit structure of analytical unit structure to artificial surface acoustic wave transmission characteristic
Influence.Here, it can change the dispersion curve of rectangular channel cellular construction by adjusting the width of rectangular channel, depth and thickness.
Fig. 2, Fig. 3 and Fig. 4 are respectively the dispersion curve of the rectangular channel cellular construction of different-thickness, different in width and different depth.By Fig. 2
As can be seen that the cutoff frequency of rectangular channel cellular construction gradually decreases as rectangle slot thickness gradually increases.Different-thickness simultaneously
The dispersion curve of rectangular channel cellular construction be respectively positioned on the right side of sound ray, namely have certain thickness rectangular channel cellular construction equal
With the ability for constraining artificial surface acoustic wave.Meanwhile from figs. 3 and 4 it can be seen that rectangular channel cellular construction width and depth
It will affect its dispersion curve, specifically, rectangular channel corresponding to broader groove width and deeper groove depth has lower section
Only frequency also just has artificial surface acoustic wave preferably restrictive.It based on above-mentioned analysis, can be by reasonably designing rectangle
Thickness, width and the depth of slot change the dispersion curve of rectangular channel cellular construction, are propped up to change rectangular channel cellular construction
The transmission characteristic for the artificial surface acoustic wave held.Rectangular channel cellular construction is just obtained into a support along linear direction array arrangement
The acoustic line structure of artificial acoustic surface wave propagation.
Since there are huge impedance mismatchs between artificial surface acoustic wave and volume wave, this causes between two kinds of sound waves
Coupling efficiency is very low, to significantly reduce the working efficiency of device.In order to realize the impedance matching between both sound waves,
A transition apparatus must be designed.Fig. 5 is the overall structure figure of acoustic waveguide designed by the present invention, including by rectangular channel unit knot
Acoustic line structure l composed by structure3With this transition apparatus.The transition apparatus is by l1And l2Two parts composition, in sound transmission knot
Structure each side has one.Wherein l1For a hollow, rectangular pipeline, a loudspeaker are placed as sound source in inside；l2It is one
A grading structure, the metal of a series of rectangular channel gradually deepened from 10mm to 30mm including depth and an arcuate structure
Plate, thickness are identical as acoustic line.The people that space wave from sound source and acoustic line are supported may be implemented in the grading structure
Impedance matching between work surface acoustic wave.The material of excessive structural according to the present invention can be equally brass, aluminium alloy etc.
Metal material.
The geometry designs of acoustic waveguide and material are constituted according to Fig.5, processing one acoustic waveguide of preparation, and to obtained
Sample carries out near-field test.Sound-filed simulation figure at last obtained acoustic waveguide surface 2mm is as shown in Fig. 6, Fig. 7 and Fig. 8.From
In figure as can be seen that from 5500Hz to 6100Hz, acoustic waveguide illustrates the splendid binding character to artificial surface acoustic wave.?
In figure, the space wave from sound source has been mostly converted into artificial surface acoustic wave, together other than a part is diffused into air
When can be seen that artificial surface acoustic wave along rectangular channel cellular construction surface propagate, it is very weak in rectangular channel cellular construction outer sound field.
Due in three frequencies, acoustic waveguide can be converted to artificial surface acoustic wave for space wave is efficient, and support it along square
Shape slot cellular construction surface is propagated, this shows that the acoustic waveguide has certain bandwidth of operation.
As shown in Figure 1, enabling the period of rectangular channel cellular construction is p, depth h, width w.Metal plate where rectangular channel
With a thickness of t, width H.As shown in figure 5, acoustic line structure length is l3, excessive structural two parts length is respectively l1And l2,
Width is H1.Geometric dimension and excessive structural geometric dimension according to the operating frequency range of acoustic waveguide, to rectangular channel cellular construction
It optimizes.In the present embodiment, mainly for the generation and transmission characteristic control of the artificial surface acoustic wave of 5500-6500Hz range
System is studied, therefore each parameter optimized is specifically provided that p=6mm, h=30mm, w=5mm, H=50mm, t=
12mm, l1=97mm, l2=42mm, l3=203mm, H1=97mm.It is above-mentioned can be with the sound wave of the artificial surface acoustic wave of high-efficiency transfer
It leads, can be generated in 5500Hz-6500Hz wide frequency range and propagates artificial surface acoustic wave.
Claims (4)
1. one kind can the artificial surface acoustic wave of high-efficiency transfer acoustic waveguide, it is characterised in that: including acoustic line structure and setting
Transition apparatus in acoustic line structure two sides, the acoustic line structure include along several rectangular channel units linearly arranged,
The transition apparatus includes hollow, rectangular pipeline and grading structure, the grading structure include the rectangular channel that depth is successively deepened and
The metal plate of arcuate structure, which is arranged in rectangular channel upper end, and the grading structure is connected with acoustic line structure.
2. one kind according to claim 1 can the artificial surface acoustic wave of high-efficiency transfer acoustic waveguide, it is characterised in that: it is described
Acoustic line structure and transition apparatus are metalwork.
3. one kind according to claim 1 or 2 can the artificial surface acoustic wave of high-efficiency transfer acoustic waveguide, it is characterised in that:
The rectangular channel cellular construction has the thickness of sub-wavelength.
4. one kind can the artificial surface acoustic wave of high-efficiency transfer acoustic waveguide design method, it is characterised in that: the following steps are included:
S1: according to the working frequency of sound wave, emulation meets the structure size of the rectangular channel unit of working frequency range；
S2: according to the size of required acoustic waveguide, by rectangular channel cellular construction along linear arrangement；
S3: the size and number by regulating and controlling rectangular channel cellular construction control the propagation characteristic of artificial surface acoustic wave；
S4: according to the size of rectangular channel unit, the size of transition structure is determined.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6320989B1 (en) * | 1999-01-22 | 2001-11-20 | Harris Corporation | Stepped acoustic impedance-matching transformer for very narrow channel acoustic traveling wave lens waveguide |
| CN105023565A (en) * | 2015-08-25 | 2015-11-04 | 哈尔滨工程大学 | Composite waveguiding structure broadband unidirectional silencer |
| CN105913852A (en) * | 2016-05-04 | 2016-08-31 | 哈尔滨工程大学 | Tunable ultra-narrow band sound filter |
| CN106228971A (en) * | 2016-07-25 | 2016-12-14 | 东南大学 | Broadband sound focusing lens based on fractal acoustic metamaterial and preparation method thereof |
| CN106328115A (en) * | 2016-08-22 | 2017-01-11 | 东南大学 | Low-frequency sound-insulation artificial material based on fractal structure |
| WO2018107098A1 (en) * | 2016-12-09 | 2018-06-14 | University Of Notre Dame | Double-zero-index structural waveguide |
-
2018
- 2018-07-24 CN CN201810820482.3A patent/CN109147755A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6320989B1 (en) * | 1999-01-22 | 2001-11-20 | Harris Corporation | Stepped acoustic impedance-matching transformer for very narrow channel acoustic traveling wave lens waveguide |
| CN105023565A (en) * | 2015-08-25 | 2015-11-04 | 哈尔滨工程大学 | Composite waveguiding structure broadband unidirectional silencer |
| CN105913852A (en) * | 2016-05-04 | 2016-08-31 | 哈尔滨工程大学 | Tunable ultra-narrow band sound filter |
| CN106228971A (en) * | 2016-07-25 | 2016-12-14 | 东南大学 | Broadband sound focusing lens based on fractal acoustic metamaterial and preparation method thereof |
| CN106328115A (en) * | 2016-08-22 | 2017-01-11 | 东南大学 | Low-frequency sound-insulation artificial material based on fractal structure |
| WO2018107098A1 (en) * | 2016-12-09 | 2018-06-14 | University Of Notre Dame | Double-zero-index structural waveguide |
Non-Patent Citations (1)
| Title |
|---|
| WEN KANG CAO ET AL.: "Acoustic surface waves on three-dimensional groove gratings with sub-wavelength thickness", 《APPLIED PHYSICS EXPRESS》, vol. 11, no. 8, 23 July 2018 (2018-07-23), pages 087301 - 1 * |
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Application publication date: 20190104 |