CN105136900A - Method for acquiring fluid-solid boundary surface wave by limited size thin plate - Google Patents
Method for acquiring fluid-solid boundary surface wave by limited size thin plate Download PDFInfo
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- CN105136900A CN105136900A CN201510452645.3A CN201510452645A CN105136900A CN 105136900 A CN105136900 A CN 105136900A CN 201510452645 A CN201510452645 A CN 201510452645A CN 105136900 A CN105136900 A CN 105136900A
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- thin plate
- wave
- acoustic impedance
- specific acoustic
- fluid
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Abstract
The invention discloses a method for acquiring fluid-solid boundary surface wave by a limited size thin plate. The method comprises 1, according to limited size thin plate parameters, determining longitudinal wave specific acoustic impedance and transverse wave specific acoustic impedance of the limited size thin plate, and according to fluid related parameters, determining fluid specific acoustic impedance, 2, according to the longitudinal wave specific acoustic impedance of the thin plate and the fluid specific acoustic impedance, determining specific acoustic impedance of a matching layer for absorbing longitudinal wave, and according to wavelength of longitudinal wave in the plate, determining thickness of the matching layer, 3, according to the transverse wave specific acoustic impedance of the plate and the fluid specific acoustic impedance, determining specific acoustic impedance of a matching layer for absorbing transverse wave, and according to wavelength of transverse wave in the plate, determining thickness of the matching layer, and 4, according to the specific acoustic impedances of the matching layers, determining materials of the matching layers, and according to the thickness of the matching layers, covering two surfaces of the thin plate with the determined matching layers. Supersonic wave excitation and reception are realized at thin plate sides. The thin plate can simulate an infinite solid, and the matching layers covering the surfaces of the thin plates can completely absorb wave reflected between plates so that fluid-solid boundary surface wave is obtained.
Description
Technical field
The invention discloses a kind of obtain Liu ?the method of solid Interface Wave, belong to Ultrasonic Detection scope, be specifically related to be a kind of utilize Liu ?solid Interface Wave inverting media property time analogy method to infinite solid.
Background technology
20 actual 30-40 ages, first Cagniard and Scholte have studied the ripple propagated along Liquid-solid interface, fluid-solid interface waves obtains extensive concern and the research of Chinese scholars subsequently, and is applied to the various fields such as geophysics, microelectronics, engineering and lossless detection.The fluid-solid interface waves such as utilizing coastal basal surface to propagate in oceanophysics is to detect the feature in seabed; Fluid-solid interface waves is utilized to detect etc. System of Detecting Surface Defects For Material and material characteristics.
Exciting for fluid-solid interface waves, method conventional at present comprises: directly excite boundary wave at Liquid-solid interface or utilize surface wave to transform.Gu but due to fluid-solid interface waves be excite on the Liquid-solid interface relative to wavelength being two semi-infinite spaces produce along stream-contact interface propagation elastic sound waves, in actual applications, the requirement of infinite solid is difficult to realize, so limit the acquisition of fluid-solid interface waves to a certain extent.
Summary of the invention
For overcoming the deficiency in prior art, the present invention seeks to be to provide a kind of utilize limited large thin plate obtain Liu ?the method of solid Interface Wave, showed the simulation in limited large thin plate double infinite solid space, by exciting at Liquid-solid interface, reception interface ripple realizes inverting to media property.
For achieving the above object, technical scheme of the present invention is as follows:
Utilize limited large thin plate to obtain a method for stream solid Interface Wave, by utilizing the real acquisition of now flowing ?solid Interface Wave of method of limited large thin plate simulation infinite solid, it is characterized in that, it comprises following step:
(1) utilizing limited large thin plate to simulate infinite solid, absorbing matching layer, to obtain the stream ?solid Interface Wave that semi-infinite space medium produces by increasing in the both sides of thin plate;
(2) its compressional wave specific acoustic impedance Z is determined according to the parameter of limited large thin plate
spwith shear wave specific acoustic impedance Z
ss; According to the specific acoustic impedance Z of the correlation parameter determination fluid of fluid
l.
(3) according to compressional wave specific acoustic impedance Z in plate
spwith fluid specific acoustic impedance Z
ldetermine the specific acoustic impedance Z of the matching layer absorbing compressional wave
p, simultaneously according to the wavelength X of compressional wave in plate
spdetermine its matching layer thickness d
p.
(4) according to shear wave specific acoustic impedance Z in plate
sswith fluid specific acoustic impedance Z
ldetermine the specific acoustic impedance Z of the matching layer absorbing shear wave
s, simultaneously according to the wavelength X of shear wave in plate
ssdetermine matching layer thickness d
s.
(5) determine its material by matching layer specific acoustic impedance, and according to its thickness, the matching layer determined be covered in thin plate two surface, excited by the side surface at plate, receive ultrasound wave just can Shi Xian Liu ?the acquisition of solid Interface Wave.
The present invention carrys out simulated implementation infinite solid by utilizing thin plate, and for meeting the condition that boundary wave produces, namely interface media of both sides is the semi-infinite space, so erected by thin plate, the width of principle becomes thickness, has been far longer than wavelength, meets the condition of boundary wave.And add that on thin plate two surface the ripple that absorption layer will reflect between two surfaces as far as possible absorbs, achieve the simulation in limited large thin plate double infinite solid space, by exciting at Liquid-solid interface, reception interface ripple realizes to media property inverting.
Accompanying drawing explanation
Fig. 1 is the concrete embodiment that the present invention uses;
Fig. 2 is the simulation legend adopting this method to realize infinite solid;
Fig. 3 is Fig. 2 vertical view, the s21 upper bound, face surface wave propagation situation.
Embodiment
In order to make content of the present invention more easily be clearly understood, below according to concrete case study on implementation also by reference to the accompanying drawings, the present invention is further detailed explanation.
See Fig. 1-Fig. 3, the present embodiment chooses limited large steel sheet, and fluid media (medium) selects water, as shown in Figure 1.In FIG, relative with s11 face, s21 face, s31 face is s12 face, s22 face, s32 face respectively.
The parameter of matching layer is calculated:
1, compressional wave specific acoustic impedance Z in compressional wave specific acoustic impedance thin plate is calculated in steel plate
sp, shear wave specific acoustic impedance Z
ssand compressional wave specific acoustic impedance Z in water
l:
Z
sp＝ρ
sc
sp(1)
ρ
sfor limited large steel plate density, c
spfor longitudinal wave propagation speed in steel plate
Z
ss＝ρ
sc
ss(2)
ρ
sfor limited large steel plate density, c
ssfor shear wave propagation speed in steel plate.
Z
l＝ρ
lc
l(3)
ρ
lfor the density of water, c
lfor longitudinal wave propagation speed in water.
2, the matching layer specific acoustic impedance Z for absorbing compressional wave is calculated
spand thickness d
p:
Z
sp, Z
lfor formula (1), (2) calculate gained
d
p＝λ
sp/4(5)
λ
spfor the wavelength of compressional wave propagated in steel plate.
3, the specific acoustic impedance Z of the matching layer for absorbing shear wave is calculated
sand thickness d
s:
Z
ss, Z
lfor formula (1), (2) calculate gained
d
s＝λ
ss/4(7)
λ
ssfor the wavelength of shear wave propagated in steel plate.
4, by the above results determination matching layer material, and the S that the matching layer calculating gained thickness is covered in steel plate is chosen
11, S
12face, as shown in Figure 2.
5, be coated with s21 face, the steel plate side excitating surface ripple of matching layer, its ripple reflected between s11 and s12 face is all transmitted in water through matching layer, as shown in Figure 3, wherein
represent compressional wave,
represent shear wave,
the compressional wave that representative is produced by transverse wave reflection,
represent the very ripple produced by longitudinal wave reflection.Thus, just can excite boundary wave on s21 face, by just can realize the inverting to media property to the collection of boundary wave.
The present invention carrys out simulated implementation infinite solid by utilizing thin plate, and for meeting the condition that boundary wave produces, namely interface media of both sides is the semi-infinite space, so erected by thin plate, the width of principle becomes thickness, has been far longer than wavelength, meets the condition of boundary wave.But because interface width is not enough, just can produces reflection and affect the generation of boundary wave, therefore adding on thin plate two surface that the ripple that absorption layer will reflect between two surfaces as far as possible absorbs.So just, achieve the simulation in limited large thin plate double infinite solid space, by exciting at Liquid-solid interface, reception interface ripple realizes inverting to media property.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. utilize limited large thin plate to obtain a method for stream solid Interface Wave, by utilizing the real acquisition of now flowing ?solid Interface Wave of method of limited large thin plate simulation infinite solid, it is characterized in that, it comprises following step:
(1) utilizing limited large thin plate to simulate infinite solid, absorbing matching layer, to obtain the stream ?solid Interface Wave that semi-infinite space medium produces by increasing in the both sides of thin plate;
(2) according to the parameter determination thin plate compressional wave specific acoustic impedance Z of thin plate
spwith shear wave specific acoustic impedance Z
ss, according to the specific acoustic impedance Z of the correlation parameter determination fluid of fluid
l.
(3) according to compressional wave specific acoustic impedance Z in thin plate
spwith fluid specific acoustic impedance Z
ldetermine the specific acoustic impedance Z of the matching layer absorbing compressional wave
p, simultaneously according to the wavelength X of compressional wave in plate
spdetermine its matching layer thickness d
p.
(4) according to shear wave specific acoustic impedance Z in thin plate
sswith fluid specific acoustic impedance Z
ldetermine the specific acoustic impedance Z of the matching layer absorbing shear wave
s, simultaneously according to the wavelength X of shear wave in thin plate
ssdetermine matching layer thickness d
s.
(5) by matching layer specific acoustic impedance determination thin plate material, and according to sheet gauge, the matching layer determined is covered in thin plate two surface, by exciting at thin plate side surface, receive ultrasound wave, just can obtains stream ?solid Interface Wave.
2. a kind of method utilizing limited large thin plate acquisition stream solid Interface Wave according to claim 1, is characterized in that, in described step (2), and compressional wave specific acoustic impedance Z
sp=ρ
sc
sp, wherein ρ
sfor limited large thin plate density, c
spfor longitudinal wave propagation speed in limited large thin plate; Shear wave specific acoustic impedance Z in limited large thin plate
ss=ρ
sc
ss, wherein c
ssfor shear wave propagation speed in limited large thin plate.
3. a kind of method utilizing limited large thin plate acquisition stream solid Interface Wave according to claim 1, is characterized in that, in described step (2), and the specific acoustic impedance Z of fluid
l=ρ
lc
l, wherein ρ
lfor fluid density, c
lfor the speed of longitudinal wave propagation in fluid.
4. a kind of method utilizing limited large thin plate acquisition stream solid Interface Wave according to claim 1, is characterized in that, in described step (3), for absorbing the specific acoustic impedance of the matching layer of compressional wave
its thickness d
p=λ
sp/ 4, wherein λ
spfor the wavelength of compressional wave propagated in solid panel.
5. a kind of method utilizing limited large thin plate acquisition stream solid Interface Wave according to claim 1, is characterized in that, in described step (4), for absorbing the specific acoustic impedance of the matching layer of shear wave
its thickness d
s=λ
ss/ 4, wherein λ
ssfor the wavelength of shear wave propagated in solid panel.
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| CN201510452645.3A CN105136900B (en) | 2015-07-28 | 2015-07-28 | A kind of method for obtaining stream solid Interface Wave using limited big thin plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107153095A (en) * | 2017-06-02 | 2017-09-12 | 大连交通大学 | The health detecting system and its method of work of a kind of composite plate structure |
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| US4484098A (en) * | 1983-12-19 | 1984-11-20 | United Technologies Corporation | Environmentally stable lithium niobate acoustic wave devices |
| CN102323333A (en) * | 2011-06-02 | 2012-01-18 | 河海大学常州校区 | Fluid-solid interface wave based sediment concentration detection device and detection method |
| CN102652435A (en) * | 2010-11-25 | 2012-08-29 | 株式会社东芝 | Ultrasound probe |
| CN102680576A (en) * | 2012-05-29 | 2012-09-19 | 河海大学常州校区 | Detection device and detection method for interface wave |
| CN102980646A (en) * | 2012-11-23 | 2013-03-20 | 河海大学常州校区 | Solid/fluid interfacial wave detecting device and method based on vector hydrophone |
-
2015
- 2015-07-28 CN CN201510452645.3A patent/CN105136900B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4484098A (en) * | 1983-12-19 | 1984-11-20 | United Technologies Corporation | Environmentally stable lithium niobate acoustic wave devices |
| CN102652435A (en) * | 2010-11-25 | 2012-08-29 | 株式会社东芝 | Ultrasound probe |
| CN102323333A (en) * | 2011-06-02 | 2012-01-18 | 河海大学常州校区 | Fluid-solid interface wave based sediment concentration detection device and detection method |
| CN102680576A (en) * | 2012-05-29 | 2012-09-19 | 河海大学常州校区 | Detection device and detection method for interface wave |
| CN102980646A (en) * | 2012-11-23 | 2013-03-20 | 河海大学常州校区 | Solid/fluid interfacial wave detecting device and method based on vector hydrophone |
Non-Patent Citations (2)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107153095A (en) * | 2017-06-02 | 2017-09-12 | 大连交通大学 | The health detecting system and its method of work of a kind of composite plate structure |
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