CN116673205A - T (0, 1) mode wave source excitation device of rod piece and preparation method - Google Patents
T (0, 1) mode wave source excitation device of rod piece and preparation method Download PDFInfo
- Publication number
- CN116673205A CN116673205A CN202310860113.8A CN202310860113A CN116673205A CN 116673205 A CN116673205 A CN 116673205A CN 202310860113 A CN202310860113 A CN 202310860113A CN 116673205 A CN116673205 A CN 116673205A
- Authority
- CN
- China
- Prior art keywords
- piezoelectric
- rod
- mounting base
- annular mounting
- cube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005284 excitation Effects 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 230000007547 defect Effects 0.000 claims description 16
- 239000003822 epoxy resin Substances 0.000 claims description 12
- 229920000647 polyepoxide Polymers 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 230000010287 polarization Effects 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 abstract description 2
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000012431 wafers Nutrition 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
- B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
- B06B1/0622—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements on one surface
- B06B1/0625—Annular array
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The application relates to a T (0, 1) mode wave source excitation device of a rod piece and a preparation method thereof, wherein the device comprises an annular mounting base, a vibration component and a piezoelectric component; the inner wall of the annular mounting base is attached to the outer wall of the measured rod; the vibration assembly comprises a plurality of cubic blocks distributed on the outer side of the annular mounting base, and the cubic blocks are connected with the annular mounting base through vibration connecting fixing pieces; the piezoelectric assembly comprises a plurality of piezoelectric sheets, the piezoelectric sheets are respectively arranged on one side of the cube, and the cube is connected with the piezoelectric sheets through piezoelectric connecting fixing pieces; the piezoelectric plates are respectively connected with an excitation voltage signal input from the outside, convert the voltage signal into mechanical vibration, and sequentially transmit the mechanical vibration to the surface of the structural measured rod through the piezoelectric connection fixing piece, the vibration assembly and the annular mounting base, so as to complete the excitation of the rod guided wave T (0, 1) mode of the measured rod. The application generates the pure T (0, 1) mode guided wave in the rod piece, and can be used for related experiments and practical applications of the pure T (0, 1) mode guided wave.
Description
Technical Field
The application relates to the technical field of functional devices and elastic wave source generating devices, in particular to a T (0, 1) mode wave source excitation device of a rod piece and a preparation method.
Background
The bar is a necessary load bearing component as an important component of some mechanical, building structures. After the rod is subjected to fatigue damage and corrosion damage, the surface and the inside of the rod can have some tiny defects, and the defects can gradually expand after the rod is loaded, so that the rod can be damaged.
In order to prevent the occurrence of the problem, the whole life cycle of the rod member structure needs to be safely detected so as to ensure the whole reliability of the mechanical and building structures. As a means for detecting the defects, the laser ultrasonic technology has the advantages of low cost and simple process, and the detection process does not cause any damage to the detected structure, so that the method is a main way for detecting whether the rod structure contains the defects.
However, due to the boundary conditions of the rod and the reflection and superposition of the ultrasonic waves in the rod, the guided waves in the rod are subjected to a dispersion phenomenon, so that the ultrasonic waves transmitted into the rod are decomposed into three independent mode forms, namely a longitudinal mode (L mode), a bending Qu Bo mode (F mode) and a torsional mode (T mode). These separate modes can cause the ultrasonic signals to produce superimposed and extremely complex reflected signals when defects in the rod are detected, which is inconvenient for further analysis of the characteristics of the defects.
Disclosure of Invention
In order to solve the defects in the prior art, the application provides a T (0, 1) mode wave source excitation device of a rod piece and a preparation method.
The application aims to achieve the aim, and the aim is achieved by the following technical scheme: a T (0, 1) mode wave source excitation device of a rod piece comprises an annular mounting base, a vibration component and a piezoelectric component;
the inner wall of the annular mounting base is attached to the outer wall of the measured rod;
the vibration assembly comprises at least two cubic blocks which are distributed at the outer side of the annular mounting base at equal intervals, and the cubic blocks are connected with the annular mounting base through vibration connecting fixing pieces;
the piezoelectric assembly comprises a plurality of piezoelectric sheets, the piezoelectric sheets are respectively arranged on one side of the cube, and the cube is connected with the piezoelectric sheets through piezoelectric connecting fixing pieces;
the piezoelectric plates are respectively connected with an excitation voltage signal input from the outside, convert the voltage signal into mechanical vibration, and sequentially transmit the mechanical vibration to the surface of the structural measured rod through the piezoelectric connection fixing piece, the vibration assembly and the annular mounting base, so as to complete the excitation of the rod guided wave T (0, 1) mode of the measured rod.
Preferably, the piezoelectric plate further comprises a plurality of first connecting wires and second connecting wires, wherein the first connecting wires are correspondingly connected to the upper surface of each piezoelectric plate, and the second connecting wires are correspondingly connected to the lower surface of each piezoelectric plate.
Preferably, the plurality of piezoelectric sheets are respectively and equally arranged on the same side face of the corresponding cube along the circumferential direction of the annular mounting base, and the same side face refers to that the circumferential tangential direction of the annular mounting base where the side face is positioned is parallel to the normal direction of the side face.
Preferably, the piezoelectric assembly shares an excitation voltage signal of one channel, and is connected with the positive pole and the negative pole of the excitation voltage signal through the first connecting wire and the second connecting wire respectively, the positive poles of the piezoelectric sheets are connected in series, and the negative poles of the piezoelectric sheets are connected in series.
Preferably, the vibration connection fixing member and the piezoelectric connection fixing member are both epoxy resin members.
Preferably, the piezoelectric sheets are the same in size, the same in material, and the same in polarization direction.
Preferably, the excitation voltage signal is a multicycle sinusoidal pulse voltage signal.
A preparation method of a T (0, 1) mode wave source excitation device of a rod piece comprises the following steps of:
s1, determining the length L and the circumferential dimension of a measured rod, wherein the length L and the circumferential dimension of the measured rod can be directly measured, and determining a required frequency section f which is more than or equal to 2c/m according to the dimension range m of a target defect in the measured rod, wherein the dimension range m refers to the length of a crack of the measured rod, and c is the wave speed of guided waves of a T (0, 1) mode rod in the measured rod;
s2, selecting the geometric shape of the annular mounting base according to the section shape of the measured rod, and determining the annular dimension l of the annular mounting base;
s3, determining the side length q of the cube according to the step S2, wherein q=l/3 pi;
s4, determining the number n of the cubes according to the step S3, wherein n is more than or equal to 2 and less than or equal to l/q;
s5, determining the number of the piezoelectric sheets as e according to the step S4, wherein n=e;
s6, determining the diameter p of the piezoelectric sheet according to the side length q of the cube, wherein p is more than or equal to q/2 and less than or equal to q;
s7, determining the distance S between two adjacent cubic blocks according to the annular dimension l of the annular mounting base and the number n of the cubic blocks, wherein s=l/n;
s8, marking the position of each cube on the annular mounting base according to the size determined in the S7;
s9, smearing epoxy resin on the annular mounting base according to the position determined in the S8, sequentially fixing the cube on the annular mounting base, and standing for two to three hours to enable the cube to be completely fixed;
s10, taking a plurality of first connecting wires, and respectively welding one end of each first connecting wire with the lower surface of the corresponding piezoelectric sheet;
s11, taking a plurality of second connecting wires, and respectively welding one end of each second connecting wire with the upper surface of the corresponding piezoelectric sheet;
s12, checking whether the first connecting wire, the second connecting wire and the corresponding connected surfaces are conductive, and if not, adjusting the steps S9-S11 until each wire is conductive with the respective connected surface;
s13, adhering the lower surface of the piezoelectric sheet to the side surface of the corresponding cube;
s14, connecting the free end of the wire connected with the upper surface of each piezoelectric plate to the positive pole/negative pole of an external excitation signal, and connecting the free end of the wire connected with the lower surface of each piezoelectric plate to the negative pole/positive pole of the external excitation signal.
Preferably, the preparation method of the T (0, 1) mode wave source excitation device of the rod piece is characterized in that epoxy resin is respectively smeared on the side surface of each cube, the lower surface of the corresponding piezoelectric sheet is sequentially and flatly adhered and fixed at the center of the side surface of the cube, and the piezoelectric sheet is kept stand for two to three hours to enable the piezoelectric sheet to be completely fixed.
Compared with the prior art, the application has the beneficial effects that:
1) The piezoelectric array is connected with a voltage signal according to the wiring mode of the application, and the pure T (0, 1) mode rod guided wave is finally generated in the rod piece through the piezoelectric connection fixing piece, the vibration array, the vibration connection fixing piece and the annular installation base, so that the piezoelectric array can be used for related experiments and practical application of the pure T (0, 1) mode rod guided wave;
2) The piezoelectric sheets in the piezoelectric assembly have the same structure, and the cubes in the vibration assembly have the same structure, so that the manufacturing difficulty is reduced;
3) According to the application, the piezoelectric sheets in the piezoelectric assembly can be regulated and controlled by only one channel, so that the operation is very concise;
4) The application can excite the guided wave of the pure T (0, 1) mode rod at a wider frequency;
5) The application is suitable for rod structures with cross section forms such as circular cross section rods, elliptic cross section rods, rectangular cross section rods and the like, and has wide application range;
6) The T (0, 1) mode wave source excitation device of the rod piece can be packaged in advance, so that the rod piece can be a detachable and portable device, and the materials adopted by the rod piece can be obtained through customization or purchase, so that the rod piece is simple in structure and convenient to prepare.
Drawings
FIG. 1 is a schematic perspective view of the present application;
FIG. 2 is a front view of the present application;
FIG. 3 is an enlarged schematic view of the structure of FIG. 1A according to the present application;
FIG. 4 is an enlarged schematic view of the structure of FIG. 2B according to the present application;
FIG. 5 is a schematic diagram of a single channel sine wave pulse excitation voltage signal according to the present application;
FIG. 6 is a graph showing the effect of the mode of the guided wave T (0, 1) of the rod generated when the solid aluminum rod is excited;
FIG. 7 is a time domain signal diagram of excitation T (0, 1) mode pole guided wave in an aluminum pole according to an embodiment of the application;
FIG. 8 is a frequency domain signal plot of an aluminum rod excitation T (0, 1) mode rod guided wave according to an embodiment of the application.
The reference numbers shown in the drawings: 1. a ring-shaped mounting base; 2. a vibration connection fixing piece; 3. a piezoelectric connection fixing member; 4. a vibration assembly; 401. a cube I; 402. a cube II; 403. a cube III; 404. a cube IV; 5. a piezoelectric assembly; 501. a piezoelectric sheet I; 502. a piezoelectric sheet II; 503. a piezoelectric sheet III; 504. a piezoelectric sheet IV; 6. a first connecting wire; 7. and a second connecting wire.
Detailed Description
The application will be further described with reference to specific embodiments, as shown in fig. 1-8, a T (0, 1) mode wave source excitation device for a rod, which includes an annular mounting base 1, a vibration assembly 4, a piezoelectric assembly 5, a first connecting wire 6, and a second connecting wire 7.
The application designs a T (0, 1) mode wave source excitation device of a rod piece and a preparation method based on the torsional polarization characteristic of a T (0, 1) mode rod wave guide displacement field. The application not only can provide single-mode excitation for the nondestructive detection of the rod piece, but also can provide experimental support for the research of the rod guide transmission depending on the mode of the rod guide T (0, 1).
The inner wall of the annular mounting base 1 of this embodiment is adapted to and mutually attached to the outer wall of the measured rod, the annular mounting base 1 is a closed annular solid metal, the annular mounting base 1 is an annular solid metal, and is used for fixing an integral device and transmitting mechanical vibration, and the annular mounting base 1 can be a circular ring, an elliptical ring, a rectangular ring, a square ring, an L-shaped ring, a T-shaped ring, an 'I' -shaped ring and the like according to the section shape of the measured rod.
The vibration assembly 4 of this embodiment includes four equally spaced cubic blocks, namely, a cubic block i 401, a cubic block ii 402, a cubic block iii 403, and a cubic block iv 404, which are distributed on the outer side of the annular mounting base 1, and the cubic blocks are connected with the annular mounting base 1 by the vibration connection fixing member 2. The cube materials are metal aluminum, four solid metal cubes are arranged at equal intervals along the circumferential direction according to the circumference of the annular mounting base 1, the vibration connection fixing piece 2 is epoxy resin, and the epoxy resin vibration connection fixing piece has higher connection strength, and is used for fixing the vibration assembly to form a whole with the annular mounting base 1 and transmitting mechanical vibration generated by the vibration assembly to the annular mounting base 1.
The piezoelectric assembly 5 comprises four piezoelectric plates corresponding to the cubic block, namely a piezoelectric plate I501, a piezoelectric plate II 502, a piezoelectric plate III 503 and a piezoelectric plate IV 504, wherein the four piezoelectric plates are the same in size, the same in material and the same in polarization direction. The piezoelectric connecting fixing piece 3 is made of epoxy resin, and the epoxy resin piezoelectric connecting fixing piece has higher connecting strength, is used for fixing the piezoelectric assembly 5 to form a whole with the vibration assembly 4, is used for guaranteeing insulation between the lower surface of the piezoelectric sheet and the vibration assembly 4, and simultaneously transmits mechanical vibration generated by the piezoelectric assembly 5 to the vibration assembly 4. The cube and the piezoelectric sheet are connected through a piezoelectric connecting fixing piece 3. In this embodiment, four piezoelectric plates are disposed on the same side of the corresponding cube at equal intervals along the circumferential direction of the annular mounting base 1, and if the four piezoelectric plates are not on the same side, pure T (0, 1) mode rod guided waves cannot be excited.
The number and the material of the piezoelectric sheets and the cubes are selected according to actual conditions.
In this embodiment, the length L of the measured rod is 3000 mm, the cross section is selected to be circular, the circumference of the circular cross section is selected to be 78.5 mm, the side length of each cube is 6 mm, the piezoelectric plates are all cylindrical piezoelectric ceramics with a diameter of 5 mm and a thickness of 1 mm and a material of PZT-5H, the polarization direction is along the thickness direction, the working frequency of the T (0, 1) mode rod waveguide wave source excitation device composed of the piezoelectric plates and the array of the size can at least cover the range of 10 to 70 khz, and the circumferential spacing of the adjacent cubes is 19.625 mm in this example.
The four piezoelectric sheets are respectively connected with an excitation voltage signal input from the outside, convert the voltage signal into mechanical vibration, and sequentially transmit the mechanical vibration to the surface of a structure measured rod through the piezoelectric connection fixing piece 3, the vibration assembly 4 and the annular mounting base 1, so as to complete the excitation of the rod guided wave T (0, 1) mode of the measured rod.
The first connecting wire 6 is connected to the upper surface of each piezoelectric sheet, and the second connecting wire 7 is connected to the lower surface of each piezoelectric sheet; the piezoelectric assembly 5 shares an excitation voltage signal of one channel, wherein the upper surface of the piezoelectric plate 501 is connected with the positive electrode of the excitation voltage signal, the lower surface of the piezoelectric plate 501 is connected with the negative electrode, the upper surface of the piezoelectric plate 502 is connected with the negative electrode, the lower surface of the piezoelectric plate 503 is connected with the positive electrode, the upper surface of the piezoelectric plate 504 is connected with the negative electrode, the lower surface of the piezoelectric plate is connected with the positive electrode, the positive electrodes of the four piezoelectric plates are connected in series, and the negative electrodes of the four piezoelectric plates are connected in series.
A preparation method of a T (0, 1) mode wave source excitation device of a rod piece adopts the T (0, 1) mode wave source excitation device of the rod piece, and the preparation method comprises the following steps:
s1, according to the length L of a measured rod, the circumferential dimension and the dimension m of a target defect, the length L of the measured rod and the circumferential dimension can be directly measured; according to the size range m of the target defect in the rod piece, determining a required frequency section f which is more than or equal to 2c/m, wherein c is the wave speed of the T (0, 1) mode rod guided wave in the measured rod, and the wave speed value is 3072m/s;
size range of target defects in this example: the length of the crack is about 13 cm; the selected frequency band is 50 khz; the size of the target defect refers to the length of the crack, the accurate size of the target defect is an unknown factor, the size range of the target defect is obtained through observation, direct measurement or numerical calculation, and then the accurate defect size is detected through the T (0, 1) mode wave source excitation device;
the length of the rod of the measured rod is 3000 mm, the cross section of the measured rod is circular, the perimeter of the circular cross section is directly measured according to the actual rod piece, and the perimeter of the circular cross section is 78.5 mm;
s2, selecting the geometric shape of the annular mounting base 1 to be circular according to the section shape of the measured rod, and determining the annular dimension l of the annular mounting base 1 to be 78.5 mm;
s3, determining the side length q of the cube according to the circumferential dimension l of the annular mounting base 1, wherein l/8 pi is not less than q and not more than l/3 pi (l is the circumferential dimension), and the dimension of the selected cube is 6 mm;
s4, determining the number n of the cubes according to the circumferential dimension l of the annular mounting base 1 and the side length q of the cubes, wherein n is more than or equal to 2 and less than or equal to l/q, and the cubes are four;
s5, determining the diameters p, q/2 and p are less than or equal to q of the piezoelectric sheets according to the side length q of the cube, wherein the diameters of the piezoelectric sheets are 5 mm, the thickness of the piezoelectric sheets is 1 mm, and the piezoelectric sheets are cylindrical piezoelectric ceramic wafers made of PZT-5H;
s6, determining the distance S between two adjacent cubes according to the circumferential dimension l of the annular mounting base 1 and the number n of cubes, wherein s=l/n, and the distance between the two adjacent cubes is 19.625 millimeters;
s7, drawing the position of each cube on the annular mounting base 1 by using a marker pen according to the sizes determined in the S4 and the S6;
s8, smearing epoxy resin on the annular mounting base 1 according to the position determined in the S7, sequentially fixing the cube blocks on the annular mounting base 1 in sequence, and standing for two to three hours to enable the cube blocks to be completely fixed;
s9, in the embodiment, four first connecting wires 6 are taken, and one end of each first connecting wire 6 is welded with the lower surface of the corresponding piezoelectric sheet;
s10, in the embodiment, four second connecting wires 7 are taken, and one end of each second connecting wire 7 is welded with the upper surface of the corresponding piezoelectric sheet;
s11, checking whether the first connecting wire 6, the second connecting wire 7 and the corresponding connected surfaces are conductive, and if not, adjusting the steps S8-S10 until each wire is conductive with the respective connected surface;
and S12, respectively smearing epoxy resin on the side surfaces of each cube, sequentially flatly bonding and fixing the lower surfaces of the corresponding piezoelectric sheets at the centers of the side surfaces of the cubes, and standing for two to three hours to enable the piezoelectric sheets to be completely fixed.
And S13, connecting the free end of the wire connected with the upper surface of each piezoelectric plate to the positive electrode (or the negative electrode) of an external excitation signal, and connecting the free end of the wire connected with the lower surface of each piezoelectric plate to the negative electrode (or the positive electrode) of the external excitation signal.
FIG. 5 is a schematic diagram of a single channel of a sine wave pulse excitation voltage signal with a center frequency of 50 kHz;
fig. 6 is an effect diagram of the device of this embodiment, showing the calculation result of an example of the excitation signal at a center frequency of 50 khz, and the displacement in the vertical rod direction is in an antisymmetric distribution.
Fig. 7 is a time domain signal diagram of the device of this embodiment exciting a T (0, 1) mode beam guided wave in an aluminum beam 3 meters long.
Fig. 8 is a frequency domain signal diagram of the device of this embodiment exciting a guided wave of a T (0, 1) mode rod in an aluminum rod with a length of 3 meters, and it can be seen that the guided wave of a pure T (0, 1) mode rod is generated in the rod under the excitation of the T (0, 1) mode wave source excitation device suitable for the rod.
It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Further, it will be understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the application, and equivalents thereof fall within the scope of the application as defined by the claims.
Claims (9)
1. A T (0, 1) mode wave source excitation device of a rod piece is characterized in that: comprises an annular mounting base (1), a vibration component (4) and a piezoelectric component (5);
the inner wall of the annular mounting base (1) is attached to the outer wall of the measured rod;
the vibration assembly (4) comprises at least two cubic blocks which are distributed at the outer side of the annular mounting base (1) at equal intervals, and the cubic blocks are connected with the annular mounting base (1) through vibration connecting fixing pieces (2);
the piezoelectric assembly (5) comprises a plurality of piezoelectric sheets, the piezoelectric sheets are respectively arranged on one side of a cube, and the cube is connected with the piezoelectric sheets through a piezoelectric connection fixing piece (3);
the piezoelectric plates are respectively connected with an excitation voltage signal input from the outside, convert the voltage signal into mechanical vibration, sequentially pass through the piezoelectric connection fixing piece (3), the vibration assembly (4), the vibration connection fixing piece (2) and the annular mounting base (1) and are conducted to the surface of a structure measured rod, and are used for completing the excitation of the rod guided wave T (0, 1) mode of the measured rod.
2. A rod T (0, 1) mode wave source excitation device according to claim 1, wherein: the piezoelectric patch further comprises a plurality of first connecting wires (6) and second connecting wires (7), wherein the first connecting wires (6) are correspondingly connected to the upper surface of each piezoelectric patch, and the second connecting wires (7) are correspondingly connected to the lower surface of each piezoelectric patch.
3. A rod T (0, 1) mode wave source excitation device according to claim 2, wherein: the piezoelectric sheets are respectively and equally arranged on the same side face of the corresponding cube along the circumferential direction of the annular mounting base (1), and the same side face refers to that the circumferential tangential direction of the annular mounting base where the side face is located is parallel to the normal direction of the side face.
4. A rod T (0, 1) mode wave source excitation device according to claim 2, wherein: the piezoelectric assembly (5) shares an excitation voltage signal of one channel, and is respectively connected with the positive electrode and the negative electrode of the excitation voltage signal through a first connecting wire (6) and a second connecting wire (7), the positive electrodes of a plurality of piezoelectric plates are connected in series, and the negative electrodes of a plurality of piezoelectric plates are connected in series.
5. A rod T (0, 1) mode wave source excitation device according to claim 1, wherein: the vibration connecting fixing piece (2) and the piezoelectric connecting fixing piece (3) are epoxy resin pieces.
6. A rod T (0, 1) mode wave source excitation device according to claim 1, wherein: the piezoelectric sheets are identical in size, identical in material and identical in polarization direction.
7. A rod T (0, 1) mode wave source excitation device according to claim 4, wherein: the excitation voltage signal is a multicycle sine pulse voltage signal.
8. A method for preparing a device for exciting a T (0, 1) mode wave source of a rod, comprising the device for exciting the T (0, 1) mode wave source of a rod according to any one of claims 1 to 7, wherein: comprises the following steps of the method,
s1, determining the length L and the circumferential dimension of a measured rod, wherein the length L and the circumferential dimension of the measured rod can be directly measured, and determining a required frequency section f which is more than or equal to 2c/m according to the dimension range m of a target defect in the measured rod, wherein the dimension range m refers to the length of a crack of the measured rod, and c is the wave speed of guided waves of a T (0, 1) mode rod in the measured rod;
s2, selecting the geometric shape of the annular mounting base (1) according to the section shape of the measured rod, and determining the annular dimension l of the annular mounting base (1);
s3, determining the side length q of the cube according to the step S2, wherein q=l/3 pi;
s4, determining the number n of the cubes according to the step S3, wherein n is more than or equal to 2 and less than or equal to l/q;
s5, determining the number of the piezoelectric sheets as e according to the step S4, wherein n=e;
s6, determining the diameter p of the piezoelectric sheet according to the side length q of the cube, wherein p is more than or equal to q/2 and less than or equal to q;
s7, determining the distance S between two adjacent cubes according to the circumferential dimension l of the annular mounting base (1) and the number n of the cubes, wherein s=l/n;
s8, marking the position of each cube on the annular mounting base (1) according to the size determined in the step S7;
s9, smearing epoxy resin on the annular mounting base (1) according to the position determined in the step S8, sequentially fixing the cube on the annular mounting base (1), and standing for two to three hours to enable the cube to be completely fixed;
s10, taking a plurality of first connecting wires (6), and respectively welding one end of each first connecting wire (6) with the lower surface of the corresponding piezoelectric sheet;
s11, taking a plurality of second connecting wires (7), and respectively welding one end of each second connecting wire (7) with the upper surface of the corresponding piezoelectric sheet;
s12, checking whether the first connecting wire (6), the second connecting wire (7) and the corresponding connected surfaces are conductive, and if not, adjusting the steps S9-S11 until each wire is conductive with the respective connected surface;
s13, adhering the lower surface of the piezoelectric sheet to the side surface of the corresponding cube;
s14, connecting the free end of the wire connected with the upper surface of each piezoelectric plate to the positive pole/negative pole of an external excitation signal, and connecting the free end of the wire connected with the lower surface of each piezoelectric plate to the negative pole/positive pole of the external excitation signal.
9. The method for preparing the T (0, 1) mode wave source excitation device of the rod piece according to claim 8, wherein the method comprises the following steps: and respectively smearing epoxy resin on the side surfaces of each cube, sequentially flatly bonding and fixing the lower surfaces of the corresponding piezoelectric sheets at the centers of the side surfaces of the cubes, and standing for two to three hours to completely fix the piezoelectric sheets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310860113.8A CN116673205A (en) | 2023-07-13 | 2023-07-13 | T (0, 1) mode wave source excitation device of rod piece and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310860113.8A CN116673205A (en) | 2023-07-13 | 2023-07-13 | T (0, 1) mode wave source excitation device of rod piece and preparation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116673205A true CN116673205A (en) | 2023-09-01 |
Family
ID=87791088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310860113.8A Pending CN116673205A (en) | 2023-07-13 | 2023-07-13 | T (0, 1) mode wave source excitation device of rod piece and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116673205A (en) |
-
2023
- 2023-07-13 CN CN202310860113.8A patent/CN116673205A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Zhou et al. | Guided torsional wave generation of a linear in-plane shear piezoelectric array in metallic pipes | |
| CN110887898B (en) | Square tube detection method and device based on ultrasonic guided waves | |
| CN108680641A (en) | Flexible array sensor based on vortex with ULTRASONIC COMPLEX | |
| US11428671B2 (en) | Arrangement for non-destructive testing and a testing method thereof | |
| CN106124635B (en) | For the PZT (piezoelectric transducer) and its control method of pipe ultrasonic guide wave flaw detection and application | |
| CN108613644B (en) | Ultrasonic probe for wall thickness reduction measurement in extreme environment | |
| CN106198727A (en) | A kind of non-linear guided circumferential method for metal circular tube Damage Evaluation | |
| CN110220974A (en) | SV ultrasound bulk wave unilateral side focused transducer suitable for aluminium sheet defects detection | |
| CN110939431A (en) | Array sensor for nondestructive detection of cement sheath defects of well cementation casing | |
| CN112630307A (en) | Modular array element piezoelectric ceramic ultrasonic guided wave detection device and detection method | |
| CN111595952A (en) | Ultrasonic phased array ring array probe and bolt detection system | |
| CN101393172A (en) | Non-damage detection for cracks in solid by non-linear resonating sound spectrum method | |
| CN109141793B (en) | Shallow spherical thin shell vibration detection control device and method | |
| US9465011B2 (en) | Flexible magnetostrictive probe having sensor elements without permanent magnets | |
| WO2015157488A1 (en) | Active waveguide excitation and compensation | |
| CN111678465B (en) | Pipeline bending detection method based on ultrasonic guided waves | |
| Wang et al. | Design and performance evaluation of electromechanical impedance instrumented quantitative corrosion measuring probe based on conical rods | |
| CN116673205A (en) | T (0, 1) mode wave source excitation device of rod piece and preparation method | |
| WO2012129478A9 (en) | Broadband waveguide | |
| CN109470774B (en) | Ultrasonic guided wave focusing transducer based on aluminum plate defect detection | |
| CN218911991U (en) | Intelligent grouting sleeve with built-in annular ultrasonic sensor array | |
| US7150200B1 (en) | Miniature axisymmetric streamline tensile (MAST) specimen | |
| CN115112148B (en) | Identification device and method for quality defect error of harmonic oscillator | |
| WO2022241855A1 (en) | Ultrasonic probe for on-line measurement of axial force of high-temperature bolt | |
| Wang et al. | Research on the Actuation Performance of 2D-Orthotropic Piezoelectric Composite Materials Linear Phased Array Transducer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |