CN104751841A - Acoustic material capable of achieving ultra-wide-band sound wave redirection - Google Patents
Acoustic material capable of achieving ultra-wide-band sound wave redirection Download PDFInfo
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- CN104751841A CN104751841A CN201510174928.6A CN201510174928A CN104751841A CN 104751841 A CN104751841 A CN 104751841A CN 201510174928 A CN201510174928 A CN 201510174928A CN 104751841 A CN104751841 A CN 104751841A
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- redirected
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- 239000012814 acoustic material Substances 0.000 title abstract 4
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- IXSZQYVWNJNRAL-UHFFFAOYSA-N etoxazole Chemical compound CCOC1=CC(C(C)(C)C)=CC=C1C1N=C(C=2C(=CC=CC=2F)F)OC1 IXSZQYVWNJNRAL-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses acoustic material capable of achieving ultra-wide-band sound wave redirection. Grooves of different depths are sequentially formed in the surface of the acoustic material, the width d of the grooves are identical, wherein lambda>2d, and lambda is the wavelength of sound waves; the distance of adjacent grooves is d0, wherein d>/=3d0. An X axis parallel with the surface and vertical to the grooves is built. The groove depth h(x) is indicated by a formula in the claims and description. The acoustic material is simple in structure, easy to implement and capable of achieving ultra-wide-band sound wave redirection by only one sound source incoming.
Description
Technical field
The present invention relates to a kind of acoustical material that ultra broadband sound wave can be made to be redirected.
Background technology
Phased-array technique is technology conventional in acoustics, and the loudspeaker sequence of usual out of phase, forms a phase outline, utilize acoustic interference effects to realize various function, and wherein sound wave is redirected transmitting is an important application.And some passive methods can only be operated in single-frequency or narrow bandwidth as acoustics surpasses surface.
Therefore, need a kind of acoustical material that ultra broadband sound wave can be made to be redirected newly to solve the problem.
Summary of the invention
The object of the invention is to reflect for the acoustical anomalies that has in the prior art large, the baroque defect of acoustical material volume be namely redirected, the acoustical material that a kind of structure simply can make ultra broadband sound wave redirected is provided.
For achieving the above object, the acoustical material with the extraordinary reflection of acoustics of the present invention can adopt following technical scheme:
Can make the acoustical material that ultra broadband sound wave is redirected, the surface of described acoustical material is provided with the groove of the different depth be arranged in order, the width d of described groove is all identical, wherein, λ >2d, λ are the wavelength of sound wave, and the distance between adjacent described groove is d
0, wherein, d>=3d
0, set up x-axis, described x-axis is parallel to described surface and vertical with described groove, and wherein, the degree of depth of groove is h (x), and wherein, the degree of depth of groove is represented by following formula h (x):
Wherein, h
1for constant, x is the coordinate that the groove of different depth projects in x-axis, θ
rfor acoustic reflection angle, (d+d
0) sin θ is compensation term, θ is sound wave incident angle.
Further, described groove is perpendicular to described surface.Structure is simpler.
Further, the width of described groove is 0.75cm, and the distance between adjacent described groove is 0.25cm.
Further, described acoustical material is arranged in background media, the acoustic impedance of the described background media of acoustic impedance more than 100 times of described acoustical material.
Inventive principle: the acoustical material with the extraordinary reflection of ultra broadband acoustics, the surface of acoustical material is provided with the groove of the different depth be arranged in order, and the width d of groove is all identical, wherein, λ >2d, λ are the wavelength of sound wave, and the distance between adjacent slot is d
0, wherein, d>=3d
0, set up x-axis, x-axis is parallel to surface and vertical with groove, and wherein, the degree of depth of groove is h (x), and wherein, the degree of depth of groove is represented by following formula h (x):
Wherein, h
0for constant, x is the coordinate that the groove of different depth projects in x-axis, and φ (x) is surperficial phase outline, k
0=2 π/λ are wave number, (d+d
0) sin θ is compensation term, θ is sound wave incident angle.
Sound wave incident surface, by designing function h (x) of different groove depth, controlling the distance that sound wave is propagated in groove, can obtain different phase feedback, thus realize specific surperficial phase outline φ (x) at surperficial diverse location.Wherein, the middle h of depth function h (x) of groove
0be h (x) >0 that a constant is guaranteed to design, in the application of phased array, required φ (x) is proportional to wave number k usually
0, and here by controlling the phase feedback form obtained of acoustic path method, just in time wave number k can be eliminated
0; because this eliminating the dependence to frequency; the phase outline designed is made to be applicable to ultrabroad band acoustical signal; break the restriction of traditional super surperficial single-frequency; here only the condition wavelength X >2d (wherein, d is the width of groove) that Sampling Theorem does not produce aliasing need be met.
By designing different phase outline, different functions can be realized, as sound wave of the present invention is redirected.
Beneficial effect: the acoustical material structure that ultra broadband sound wave can be made to be redirected of the present invention is simple, easily realizes, only needs a sound source incidence just can realize ultra broadband sound wave and is redirected.
Accompanying drawing explanation
Fig. 1 is the structural representation of the acoustical material that ultra broadband sound wave can be made to be redirected of the present invention;
Fig. 2 is the numerical simulation of 7277Hz sound wave incident and the result figure of experiment in embodiment 1;
Fig. 3 is the numerical simulation of 12128Hz sound wave incident and the result figure of experiment in embodiment 1;
Fig. 4 is the numerical simulation of 16979Hz sound wave incident and the result figure of experiment in embodiment 1.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
Refer to shown in Fig. 1, the acoustical material that ultra broadband sound wave can be made to be redirected of the present invention, the surface of acoustical material is provided with the groove of the different depth be arranged in order, the width d of groove is all identical, wherein, and λ >2d, λ is the wavelength of sound wave, and the distance between adjacent slot is d
0, wherein, d>=3d
0, set up x-axis, x-axis is parallel to surface and vertical with groove, and wherein, the degree of depth of groove is h (x), and wherein, the degree of depth of groove is represented by following formula h (x):
Wherein, h
1for constant, x is the coordinate that the groove of different depth projects in x-axis, θ
rfor acoustic reflection angle, (d+d
0) sin θ is compensation term, θ is sound wave incident angle.Middle slot of the present invention, perpendicular to surface, can omit compensation term, operates more simple and convenient.The width of groove is 0.75cm, and the distance between adjacent slot is 0.25cm.
Acoustical material is arranged in background media, and the acoustic impedance of acoustical material is more than the acoustic impedance of the background media of 100 times.Background media is generally air.
Inventive principle: the acoustical material with the extraordinary reflection of ultra broadband acoustics, the surface of acoustical material is provided with the groove of the different depth be arranged in order, and the width d of groove is all identical, wherein, λ >2d, λ are the wavelength of sound wave, and the distance between adjacent slot is d
0, wherein, d>=3d
0, set up x-axis, x-axis is parallel to surface and vertical with groove, and wherein, the degree of depth of groove is h (x), and wherein, the degree of depth of groove is represented by following formula h (x):
Wherein, h
0for constant, x is the coordinate that the groove of different depth projects in x-axis, and φ (x) is surperficial phase outline, k
0=2 π/λ are wave number, (d+d
0) sin θ is compensation term, θ is sound wave incident angle.
Sound wave incident surface, by designing function h (x) of different groove depth, controlling the distance that sound wave is propagated in groove, can obtain different phase feedback, thus realize specific surperficial phase outline φ (x) at surperficial diverse location.Wherein, the middle h of depth function h (x) of groove
0be h (x) >0 that a constant is guaranteed to design, in the application of phased array, required φ (x) is proportional to wave number k usually
0, and here by controlling the phase feedback form obtained of acoustic path method, just in time wave number k can be eliminated
0; because this eliminating the dependence to frequency; the phase outline designed is made to be applicable to ultrabroad band acoustical signal; break the restriction of traditional super surperficial single-frequency; here only the condition wavelength X >2d (wherein, d is the width of groove) that Sampling Theorem does not produce aliasing need be met.Be that (namely φ (x) is proportional to x) constant, can realize Abnormal acoustic wave reflection (i.e. sound wave redirected) by designed phase gradient.
By designing different phase outline, different functions can be realized, as sound wave of the present invention is redirected.
The acoustical material structure that ultra broadband sound wave can be made to be redirected of the present invention is simple, easily realizes, and only needs a sound source incidence just can realize ultra broadband sound wave and is redirected
Embodiment 1: sound wave is redirected
Refer to shown in Fig. 2, Fig. 3 and Fig. 4, show at normal incidence, produce the extraordinary surface of 45 degree of reflections.Now surperficial phase outline should meet linear change, and according to the concept of generalized reflection law, abnormal reflection angle is:
Abnormal reflection angle θ can be obtained
rwith the pass of the gradient g (x) of channel depth change be:
θ
r＝arcsin[sin(θ
i)+2g(x)]
Notice that the reflection angle in formula 3 has nothing to do with wavelength, therefore, the mechanism of proposition can eliminate the dependence to wavelength, thus realizes the application at ultra broadband.As structural parameters g=0.3535, (namely groove depth meets h (x)=h
0-0.3535x), can obtain the effect that the sound wave as figure is redirected, (width of groove is d=0.75cm to the sample showing for 7cm × 19.5cm in Fig. 2, and cell wall is thick is d
0=0.25cm), in the numerical simulation of 3 different frequencies (7277Hz, 12128Hz, 16979Hz) and the result of experiment.
In actual design, change parameter h (x) (or g (x)), Abnormal acoustic wave reflection at any angle can be realized and be redirected.
Claims (4)
1. the acoustical material that ultra broadband sound wave can be made to be redirected, it is characterized in that: the groove surface of described acoustical material being provided with the different depth be arranged in order, the width d of described groove is all identical, wherein, λ >2d, λ is the wavelength of sound wave, and the distance between adjacent described groove is d
0, wherein, d>=3d
0, set up x-axis, described x-axis is parallel to described surface and vertical with described groove, and wherein, the degree of depth of groove is h (x), and wherein, the degree of depth of groove is represented by following formula h (x):
Wherein, h
1for constant, x is the coordinate that the groove of different depth projects in x-axis, θ
rfor acoustic reflection angle, (d+d
0) sin θ is compensation term, θ is sound wave incident angle.
2. the acoustical material that ultra broadband sound wave can be made as claimed in claim 1 to be redirected, is characterized in that: described groove is perpendicular to described surface.
3. the acoustical material that ultra broadband sound wave can be made as claimed in claim 1 to be redirected, is characterized in that: the width of described groove is 0.75cm, and the distance between adjacent described groove is 0.25cm.
4. can make the acoustical material that ultra broadband sound wave is redirected as claimed in claim 1, it is characterized in that: described acoustical material is arranged in background media, the acoustic impedance of described acoustical material is greater than the acoustic impedance of the described background media of 100 times.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105448288A (en) * | 2015-11-11 | 2016-03-30 | 南京大学 | Acoustic material for generating acoustic specular reflection |
| CN105869620A (en) * | 2016-03-25 | 2016-08-17 | 南京大学 | Broadband and stable multi-arm folded acoustic eddy field transmitter |
| WO2021206330A1 (en) * | 2020-04-06 | 2021-10-14 | 한국표준과학연구원 | Metasurface having one smooth and exposed surface and method for designing same |
| CN115236647A (en) * | 2022-07-22 | 2022-10-25 | 江苏科技大学 | Corner reflector with acoustic super surface, corner reflector and intensity evaluation method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505085A (en) * | 2014-12-03 | 2015-04-08 | 南京大学 | Ultra-wideband acoustic absorber |
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2015
- 2015-04-14 CN CN201510174928.6A patent/CN104751841B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104505085A (en) * | 2014-12-03 | 2015-04-08 | 南京大学 | Ultra-wideband acoustic absorber |
Non-Patent Citations (3)
| Title |
|---|
| YANGBO XIE ETC.: "Wavefront Modulation and Subwavelength Diffractive Acoustics with an Acoustic Metasuface", 《RESEARCHGATE》 * |
| YI-FAN ZHU ETC: "Ultra-Broadband Acoustic Metasurface for Manipulating the Reflected Waves", 《EPRINT ARXIV》 * |
| 邹欣晔等: "单向声传播结构研究", 《应用声学》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105448288A (en) * | 2015-11-11 | 2016-03-30 | 南京大学 | Acoustic material for generating acoustic specular reflection |
| CN105448288B (en) * | 2015-11-11 | 2019-04-16 | 南京大学 | A kind of acoustical material that can generate sound wave regular reflection |
| CN105869620A (en) * | 2016-03-25 | 2016-08-17 | 南京大学 | Broadband and stable multi-arm folded acoustic eddy field transmitter |
| CN105869620B (en) * | 2016-03-25 | 2019-05-03 | 南京大学 | A kind of multi-arm folded form acoustics vortex field emission device that wideband is stable |
| WO2021206330A1 (en) * | 2020-04-06 | 2021-10-14 | 한국표준과학연구원 | Metasurface having one smooth and exposed surface and method for designing same |
| KR20210123945A (en) * | 2020-04-06 | 2021-10-14 | 한국표준과학연구원 | Metasurface having exposed smooth side and method for designing the same |
| KR102387310B1 (en) | 2020-04-06 | 2022-04-18 | 한국표준과학연구원 | Metasurface having exposed smooth side and method for designing the same |
| CN115236647A (en) * | 2022-07-22 | 2022-10-25 | 江苏科技大学 | Corner reflector with acoustic super surface, corner reflector and intensity evaluation method |
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| CN104751841B (en) | 2018-07-31 |
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