CN109939916A - A kind of ultrasonic wave launching technique - Google Patents
A kind of ultrasonic wave launching technique Download PDFInfo
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- CN109939916A CN109939916A CN201910218208.3A CN201910218208A CN109939916A CN 109939916 A CN109939916 A CN 109939916A CN 201910218208 A CN201910218208 A CN 201910218208A CN 109939916 A CN109939916 A CN 109939916A
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- adherency
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- ultrasonic oscillator
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Abstract
The invention discloses a kind of ultrasonic wave launching techniques, applied to ultrasonic transducer, ultrasonic transducer includes: the ultrasonic oscillator of shell and adherency on the shell, method includes: the property parameters for obtaining ultrasonic oscillator, wherein, property parameters include: one of density, elastic constant matrix, piezoelectric matrix and dielectric matrix of ultrasonic oscillator or combination；According to the vibration frequency of the property parameters of ultrasonic oscillator and shell, the modal analysis result of shell and ultrasonic oscillator under the conditions of the adherency of each setting is obtained using finite element method, wherein, adherency condition includes: the ingredient of adhesive and the proportion of adhesive；According to target frequency, corresponding modal analysis result is obtained, and corresponding adherency condition is obtained according to modal analysis result, is adhered to each other ultrasonic oscillator and shell according to adherency condition.Using the embodiment of the present invention, the ultrasonic transducer with target frequency can produce.
Description
Technical field
The present invention relates to a kind of ultrasonic wave production methods, are more particularly to a kind of ultrasonic wave launching technique.
Background technique
Ultrasonic wave has good penetrability and directionality, while having lesser Decay Rate, be used as positioning distance measuring,
The medium carrier of the application fields such as subsurface communication, non-destructive testing.
As the core devices for generating transmitting ultrasonic wave, ultrasonic transducer is by ultrasonic oscillator, shell and corresponding connection
Component is constituted, and wherein ultrasonic oscillator is the key factor for determining ultrasonic transducer working frequency.Under normal conditions, ultrasonic wave
Oscillator is generally bonded by piezoelectric ceramic piece and sheet metal, and piezoelectric ceramic piece drives sheet metal vibration, generates ultrasonic wave.
But in the prior art in order to obtain the ultrasonic transducer of target frequency, usually by ultrasonic oscillator and outer
Shell links together, and then carries out ultrasonic wave transmitting test.Then the tranmitting frequency of the ultrasonic transducer obtained according to test
It is whether consistent with preset target frequency, if inconsistent, adjust ultrasonic oscillator and shell adherency condition, then after
It is continuous to be tested, until obtaining the ultrasonic transducer of target frequency.Therefore, determining ultrasonic transducer exists in the prior art
Glue the relatively complicated technical problem of conditional process.
Summary of the invention
Technical problem to be solved by the present invention lies in a kind of ultrasonic wave launching technique is provided, easily to determine target
Adherency condition in the ultrasonic transducer of frequency between ultrasonic oscillator and shell.
The present invention is to solve above-mentioned technical problem by the following technical programs:
The embodiment of the invention provides a kind of ultrasonic wave launching techniques, are applied to ultrasonic transducer, the ultrasonic waves
Energy device includes: the ultrasonic oscillator of shell and adherency on the housing, which comprises
Obtain the property parameters of the ultrasonic oscillator, wherein the property parameters include: ultrasonic oscillator density,
One of elastic constant matrix, piezoelectric matrix and dielectric matrix or combination；
According to the vibration frequency of the property parameters of the ultrasonic oscillator and the shell, finite element method is utilized
Obtain the shell and modal analysis result of the ultrasonic oscillator under the conditions of adherency of each setting, wherein described viscous
Sub conditione includes: the ingredient of adhesive and the proportion of the adhesive；
According to target frequency, corresponding modal analysis result is obtained, and corresponding according to modal analysis result acquisition
The ultrasonic oscillator and the shell are adhered to each other by adherency condition according to the adherency condition.
Optionally, described to obtain the shell and the ultrasonic oscillator in each setting using finite element method
Modal analysis result under the conditions of adherency, comprising:
For each adherency condition, the shell is obtained with the ultrasonic oscillator described using finite element method
The vibration shape result of each rank under the conditions of adherency.
Optionally, described that corresponding modal analysis result is obtained according to target frequency, and according to the modal analysis result
Obtain corresponding adherency condition, comprising:
Direction of vibration is found out from the modal analysis result as radial vibration, and the mesh that vibrational energy distribution is concentrated
Mark modal analysis result；
Searched from target modalities analysis result with the analysis of target frequency matched target modalities as a result,
Using the corresponding adherency condition of target modalities analysis result as acquired adherency condition.
Optionally, the adhesive, comprising:
According to the wood powder and polyurethane adhesive of the 40-200 mesh of 2:1-1:20 ratio mixing.
Optionally, the wood powder includes: in Poplar Powder, pine powder, joss powder, teak powder, fir powder and English walnut wood powder
One kind or combination.
Optionally, the shape of the shell is plate shell or spherical shell.
Optionally, the shape of the ultrasonic oscillator are as follows: plate or dome shape.
Optionally, the material of the shell is metal or nonmetallic materials.
The present invention has the advantage that compared with prior art
Using the embodiment of the present invention, using finite element method, to the transducer enclosure intrinsic frequency and mode into
Row analysis, obtain the vibration shape of ultrasonic oscillator and intrinsic frequency characteristic under this constraint condition, determine the ultrasonic oscillator with
Adherency condition between transducer enclosure, the embodiment of the present invention is not under the premise of changing existing ultrasonic oscillator, using existing
Mode that ready-made ultrasonic oscillator and external shell are coupled and generate the ultrasonic wave with expected frequence.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of ultrasonic wave launching technique provided in an embodiment of the present invention；
Fig. 2 is that the first of ultrasonic oscillator and shell are viscous in a kind of ultrasonic wave launching technique provided in an embodiment of the present invention
Attached schematic diagram；
Fig. 3 is that second of ultrasonic oscillator and shell in a kind of ultrasonic wave launching technique provided in an embodiment of the present invention is viscous
Attached schematic diagram；
Fig. 4 is that second of ultrasonic oscillator and shell in a kind of ultrasonic wave launching technique provided in an embodiment of the present invention is viscous
Attached schematic diagram；
Fig. 5 is the result schematic diagram of five first order modes in a kind of ultrasonic wave launching technique provided in an embodiment of the present invention；
Fig. 6 is the result schematic diagram of six first order modes in a kind of ultrasonic wave launching technique provided in an embodiment of the present invention；
Fig. 7 is the result schematic diagram of eight first order modes in a kind of ultrasonic wave launching technique provided in an embodiment of the present invention.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
It should be noted that the embodiment of the present invention is preferably applied to ultrasonic transducer.
Fig. 1 is a kind of flow diagram of ultrasonic wave launching technique provided in an embodiment of the present invention, as shown in Figure 1, described
Ultrasonic transducer includes: the ultrasonic oscillator of shell and adherency on the housing, which comprises
S101: the property parameters of the ultrasonic oscillator are obtained, wherein the property parameters include: ultrasonic oscillator
One of density, elastic constant matrix, piezoelectric matrix and dielectric matrix or combination.
Illustratively, piezoelectric ceramic ultrasound oscillator used in the embodiment of the present invention is emission type PZT-4 type piezoelectricity pottery
Porcelain, density 7500kg/m3。
The elastic constant matrix of the ceramics is
Piezoelectric matrix are as follows:
Dielectric matrix are as follows:
Dielectric constant in vacuum is ε0=8.85 × 10-12F/m。
S102: according to the vibration frequency of the property parameters of the ultrasonic oscillator and the shell, finite element fraction is utilized
Analysis method obtains the shell and modal analysis result of the ultrasonic oscillator under the conditions of adherency of each setting, wherein
The adherency condition includes: the ingredient of adhesive and the proportion of the adhesive；
Specifically, each adherency condition can be directed to, the shell and the ultrasound are obtained using finite element method
The vibration shape result of wave oscillator each rank under the conditions of the adherency.
Illustratively, Fig. 2 is ultrasonic oscillator and shell in a kind of ultrasonic wave launching technique provided in an embodiment of the present invention
The first adherent fashion schematic diagram；As shown in Fig. 2, 201 be disc or cylindrical sonic oscillator, pass through coupling layer
202 are attached with planar shaped transducer enclosure 203.Coupling layer 202 is mainly the adhesive that polyurethane and wood powder mix.
The material of shell 203 is preferably metallic aluminium, stainless steel or PVC plastic.
Fig. 3 is that second of ultrasonic oscillator and shell in a kind of ultrasonic wave launching technique provided in an embodiment of the present invention is viscous
Attached schematic diagram, as shown in figure 3,301 be arc-shaped ultrasonic oscillator, 302 be coupling layer, and 303 is outside arc-shaped energy converters
Shell.The effect of coupling layer 302 is that arc-shaped ultrasonic oscillator 301 is made to be of coupled connections with arc-shaped transducer enclosure 303.Circle
Arc ultrasonic oscillator 301 is consistent with the radian of arc-shaped transducer enclosure 303, it is ensured that the two uniformly connects coupling.Coupling
Closing layer 202 is mainly the adhesive that polyurethane and wood powder mix.
Fig. 4 is that second of ultrasonic oscillator and shell in a kind of ultrasonic wave launching technique provided in an embodiment of the present invention is viscous
Attached schematic diagram, as shown in figure 4, there is changing for Pinggu with bottom for disc of the present invention or cylindrical sonic oscillator
Combination between energy device shell.In figure, 401 be disc or cylindrical sonic oscillator, and 402 be coupling layer, and 403 be bottom
Transducer enclosure with Pinggu.The effect of coupling layer 402 is to have disc or cylindrical sonic oscillator 401 with bottom
The transducer enclosure 403 in Pinggu is of coupled connections.The area or circular cross-section of disc or cylindrical sonic oscillator 401 product
It is consistent with the area in 403 bottom circular Pinggu of transducer enclosure.Coupling layer 202 is mainly that polyurethane is glued with what wood powder mixed
Mixture.
Then, for one of preset Fig. 2-4 adherent fashion, according to 2:1,1:1,1:2,1:4,1:8,1:
12, the mass ratio of 1:16,1:20 are respectively by the Poplar Powder of 40,60,80,100,120,140,160,180,200 mesh and philharmonic spy
The CA380 type polyurethane bonding agent mixing of Investment Co., Ltd's production, obtains the adhesive of different ratio.
Then by the physical and chemical parameter of the adhesive of each proportion, for example, the density of adhesive, adhesive using thickness,
One kind or combination of the physical parameters such as the elasticity modulus of adhesive；And the relevant parameter of the shell obtained in S101 step,
It is input in finite element analysis software such as, the piezo electric module in ANSYS software carries out the simulation of ultrasonic transducer model analysis.
The mathematical expression of simulation process can be with are as follows:
For vibration problem under undamped edge-restraint condition, the coupling moment of piezoelectric ultrasonic oscillator finite element individual unit
Battle array are as follows:
Wherein,
Wherein [M] is the mass matrix of the finite element unit；{ x (t) } is the modal displacement vector of the finite element unit；
[K] is the stiffness matrix of the finite element unit；[ε] is the dielectric constant matrix of the finite element unit；[e] is the finite element unit
Piezoelectricity coupling matrix；{ F } is the constrained vector of the finite element unit；{ Q } is the electrode surface free charge of the finite element unit
Amount.
According to principle of elasticity, the vibration of elastomer can be decomposed into a series of superposition of simple harmonic oscillations, in order to solve
The eigenfrequncies and vibration models of piezoelectric ceramic ultrasound oscillator vibration consider the solution of simple harmonic motion are as follows:
{ x (t) }={ φi}sinωt (2)
The solution of simple harmonic oscillation, which is brought into formula (1), (3) formula and (4) formula is acquired with abbreviation:
([K]-ω2[M]){φiSin ω t={ F } (3)
[e]T{φiSin ω t={ Q } (4)
It is available that simultaneous formula (3) and (4) solve ω:
[K]=∫V[B]T[C][B]dV；
[S]=[B] { x }, wherein
S is strain matrix；X is modal displacement.
Wherein { x (t) } is displacement；{φiIt is amplitude column vector；ω is intrinsic frequency；[B] is connection strain and node position
The matrix of shifting, referred to as geometric matrix.
Fig. 5 is the result schematic diagram of five first order modes in a kind of ultrasonic wave launching technique provided in an embodiment of the present invention；
Fig. 6 is the result schematic diagram of six first order modes in a kind of ultrasonic wave launching technique provided in an embodiment of the present invention；Figure
Fig. 7 is the result schematic diagram of eight first order modes in a kind of ultrasonic wave launching technique provided in an embodiment of the present invention；Such as figure
Shown in 5-7, the characterize data of left data ultrasonic intensity in figure.
For example, the vibration frequency of preceding 8 rank obtained after finite element analysis is as shown in table 1, table 1 provides for the embodiment of the present invention
Each first order mode vibration frequency list.
As shown in table 1, single order and second_mode are Z-direction and X to radial vibration；Three ranks, six ranks and seven first order modes are unobvious；
Quadravalence, five ranks and eight first order modes complexity and power dissipation.Therefore, can produce the frequency that radially resonates be 84179kHz and
89612kHz, thus can determine whether to generate in the intrinsic frequency of this transducer enclosure structure the frequency range of resonance 84kHz and 90kHz it
Between.
S103: according to target frequency, corresponding modal analysis result is obtained, and according to modal analysis result acquisition pair
The ultrasonic oscillator and the shell are adhered to each other by the adherency condition answered according to the adherency condition.
Specifically, direction of vibration can be found out from the modal analysis result as radial vibration, and vibrational energy
The target modalities that distribution is concentrated analyze result；It is searched and the matched target mould of target frequency from target modalities analysis result
State analysis is as a result, using the corresponding adherency condition of target modalities analysis result as acquired adherency condition.
Illustratively, vibration shape under the conditions of adherency that target frequency is different from obtained in the S102 step be Z-direction and X to
The frequency of radial vibration is compared, if the vibration shape is frequency and the target frequency of Z-direction and X to radial vibration under the conditions of a certain adherency
Rate matches, then using the proportion of the corresponding adhesive of adherency condition, adhesive thickness as the adherency condition to be obtained,
And then ultrasonic oscillator and shell are equipped according to the adherency condition.
It is emphasized that adherency condition include: the proportion of each ingredient in adhesive, polyurethane model, wood powder partial size,
One kind or combination of the density of adhesive, the physical parameters such as elasticity modulus using thickness, adhesive of adhesive.
Using embodiment illustrated in fig. 1 of the present invention, using finite element method, to the transducer enclosure intrinsic frequency and
Mode is analyzed, and is obtained the vibration shape of ultrasonic oscillator and intrinsic frequency characteristic under this constraint condition, is determined the ultrasonic wave
Adherency condition between oscillator and transducer enclosure, the embodiment of the present invention are adopted under the premise of not changing existing ultrasonic oscillator
The ultrasonic wave with expected frequence is generated with having mode that ready-made ultrasonic oscillator and external shell are coupled.
It, can be by changing ultrasonic oscillator and the mutual different combination side of external shell using the embodiment of the present invention
Formula such as adheres to condition, can obtain the energy converter of different operating frequency, implementation method is simple and practical.
In a kind of specific embodiment of the embodiment of the present invention, the wood powder include: Poplar Powder, pine powder, joss powder,
One of teak powder, fir powder and English walnut wood powder or combination.
In practical applications, one of above-mentioned wood powder can be used only, the mixture of a variety of wood powders, example also can be used
It such as, can be with one in higher proportion of pine powder, joss powder, teak powder or English walnut wood powder when needing highdensity wood powder
Kind is a variety of, and when needing the wood powder compared with low-density, one or more of Poplar Powder or fir powder can be used.
It is described in order to improve the applicability of ultrasonic transducer in a kind of specific embodiment of the embodiment of the present invention
The shape of shell is plate shell or spherical shell.
In practical applications, in order to preferably adapt to the cross sectional shape of city supply water pipeline, spherical shell can be used.Into
One step, in order to avoid the collision of ultrasonic transducer and water supply line, spherical buffering can be wrapped up outside ultrasonic transducer
Layer.
In a kind of specific embodiment of the embodiment of the present invention, the shape of the ultrasonic oscillator are as follows: plate or ball
Planar.
In practical applications, the shape of ultrasonic oscillator can be plate, and the shape of shell can may be for plate
It is spherical；The shape of ultrasonic oscillator can be dome shape, and the shape of shell can may be dome shape for plate.
In a kind of specific embodiment of the embodiment of the present invention, the material of the shell is metal or non-metallic material
Material.
Further, shell can be adhered to ball for hollow metal or nonmetallic manufactured spherical shape, ultrasonic oscillator
In shape shell.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (8)
1. a kind of ultrasonic wave launching technique, which is characterized in that be applied to ultrasonic transducer, the ultrasonic transducer includes:
The ultrasonic oscillator of shell and adherency on the housing, which comprises
Obtain the property parameters of the ultrasonic oscillator, wherein the property parameters include: the density of ultrasonic oscillator, elasticity
One of constant matrices, piezoelectric matrix and dielectric matrix or combination；
According to the vibration frequency of the property parameters of the ultrasonic oscillator and the shell, obtained using finite element method
The shell and modal analysis result of the ultrasonic oscillator under the conditions of adherency of each setting, wherein the adherency item
Part includes: the ingredient of adhesive and the proportion of the adhesive；
According to target frequency, corresponding modal analysis result is obtained, and corresponding adherency is obtained according to the modal analysis result
The ultrasonic oscillator and the shell are adhered to each other by condition according to the adherency condition.
2. a kind of ultrasonic wave launching technique according to claim 1, which is characterized in that described to utilize finite element method
Obtain the shell and modal analysis result of the ultrasonic oscillator under the conditions of adherency of each setting, comprising:
For each adherency condition, the shell and the ultrasonic oscillator are obtained in the adherency using finite element method
Under the conditions of each rank vibration shape result.
3. a kind of ultrasonic wave launching technique according to claim 1, which is characterized in that it is described according to target frequency, it obtains
Corresponding modal analysis result, and corresponding adherency condition is obtained according to the modal analysis result, comprising:
Direction of vibration is found out from the modal analysis result as radial vibration, and the target mould that vibrational energy distribution is concentrated
State analyzes result；
Searched from target modalities analysis result with the analysis of target frequency matched target modalities as a result,
Using the corresponding adherency condition of target modalities analysis result as acquired adherency condition.
4. a kind of ultrasonic wave launching technique according to claim 1, which is characterized in that the adhesive, comprising:
According to the wood powder and polyurethane adhesive of the 40-200 mesh of 2:1-1:20 ratio mixing.
5. a kind of ultrasonic wave launching technique according to claim 4, which is characterized in that the wood powder includes: Poplar Powder, pine
One of wood powder, joss powder, teak powder, fir powder and English walnut wood powder or combination.
6. a kind of ultrasonic wave launching technique according to claim 1, which is characterized in that the shape of the shell is outside plate
Shell or spherical shell.
7. a kind of ultrasonic wave launching technique according to claim 6, which is characterized in that the shape of the ultrasonic oscillator
Are as follows: plate or dome shape.
8. a kind of ultrasonic wave launching technique according to claim 6, which is characterized in that the material of the shell be metal or
Person's nonmetallic materials.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004103014A2 (en) * | 2003-05-09 | 2004-11-25 | The Crest Group, Inc. | Advanced ceramics in ultrasonic transducerized devices |
| CN103308609A (en) * | 2013-06-26 | 2013-09-18 | 哈尔滨工业大学 | Lamb wave mode control method based on electromagnetic ultrasonic emission transducer |
| CN104462667A (en) * | 2014-11-21 | 2015-03-25 | 电子科技大学 | Method for obtaining ultrasonic frequency dispersion curve |
| KR101727593B1 (en) * | 2015-10-30 | 2017-04-17 | 주식회사 로토스 | A device for measuring the viscosity of fluid using piezo ceramic |
| CN108536963A (en) * | 2018-04-10 | 2018-09-14 | 哈尔滨理工大学 | A kind of design method of hollow sandwich piezoelectric ceramic transducer |
-
2019
- 2019-03-21 CN CN201910218208.3A patent/CN109939916B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004103014A2 (en) * | 2003-05-09 | 2004-11-25 | The Crest Group, Inc. | Advanced ceramics in ultrasonic transducerized devices |
| CN103308609A (en) * | 2013-06-26 | 2013-09-18 | 哈尔滨工业大学 | Lamb wave mode control method based on electromagnetic ultrasonic emission transducer |
| CN104462667A (en) * | 2014-11-21 | 2015-03-25 | 电子科技大学 | Method for obtaining ultrasonic frequency dispersion curve |
| KR101727593B1 (en) * | 2015-10-30 | 2017-04-17 | 주식회사 로토스 | A device for measuring the viscosity of fluid using piezo ceramic |
| CN108536963A (en) * | 2018-04-10 | 2018-09-14 | 哈尔滨理工大学 | A kind of design method of hollow sandwich piezoelectric ceramic transducer |
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