CN103150449A - Design method of electromagnetic ultrasonic body wave transducer - Google Patents
Design method of electromagnetic ultrasonic body wave transducer Download PDFInfo
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- CN103150449A CN103150449A CN201310099541XA CN201310099541A CN103150449A CN 103150449 A CN103150449 A CN 103150449A CN 201310099541X A CN201310099541X A CN 201310099541XA CN 201310099541 A CN201310099541 A CN 201310099541A CN 103150449 A CN103150449 A CN 103150449A
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Abstract
The invention discloses a design method of an electromagnetic ultrasonic body wave transducer, relating to a design method of an electromagnetic ultrasonic body wave transducer, solving the problems of the weak excited body wave signal of the existing electromagnetic ultrasonic body wave transducer and more wave modes in the excited body wave signal. The design method comprises the main steps of: defining parameters required by modeling; establishing a geometric model of each part; setting material attributes; dividing a physical field solving region; modeling an emitting process; modeling a receiving process; partitioning a net of a finite element and solving the finite element; and finding out key parameters influencing induction voltage signal strength and sound wave mode purity in an electromagnetic ultrasonic body wave transducer coil 2, calculating a transducer parameter when the signal of the electromagnetic ultrasonic body wave transducer is strongest and the sound wave mode is optimal, and designing the electromagnetic ultrasonic body wave transducer. The design method has the characteristics that the simplicity is achieved in operation and the influence of the parameters of the electromagnetic ultrasonic body wave transducer to the induction voltage signal is easily analyzed. The design method can be widely applied to the design of the infinite element of any electromagnetic ultrasonic body wave transducer.
Description
Technical field
The present invention relates to a kind of method for designing of electromagnetic acoustic bulk wave transducer.
Background technology
Electromagnetic acoustic bulk wave transducer can inspire ultrasonic bulk wave effectively in metal specimen, be widely applied in electromagnetic acoustic Non-Destructive Testing and nondestructive evaluation field.For convenience of producing and receiving the bulk wave signal, electromagnetic acoustic bulk wave transducer general work pattern is the transceiver pattern, and namely an electromagnetic acoustic bulk wave transducer not only produces bulk wave but also receive the bulk wave echoed signal.Electromagnetic acoustic bulk wave transducer winding form mainly contains three kinds of spiral winding, runway coil and butterfly shaped coilses, and multi-form coil need to be equipped with corresponding magnetic field and effectively excites bulk wave.Wherein to be equipped with the electromagnetic acoustic bulk wave transducer dimensions of cylindrical permanent magnet little, simple in structure for spiral winding, excites bulk wave to be distributed symmetrically, and uses also the most extensive.But, compare with the piezoelectric supersonic technology, the bulk wave signal that electromagnetic acoustic bulk wave transducer excites a little less than, and in the bulk wave signal that excites, wave mode is more, has affected effective judgement of flaw echoes.
Summary of the invention
The present invention is for a little less than solving existing electromagnetic acoustic bulk wave transducer and exciting the bulk wave signal and excite the more problem of wave mode in the bulk wave signal, and a kind of electromagnetic acoustic bulk wave transducer designs method that proposes.
The present invention solves the problems of the technologies described above the technical scheme of taking to be:
A kind of electromagnetic acoustic bulk wave transducer designs method, described method for designing are based on that the transducer model that comprises permanent magnet, electromagnet ultrasonic changer coil, metal specimen to be measured, refinement layer, defective and air far field carries out; Described permanent magnet is cylindrical permanent magnet; Described electromagnet ultrasonic changer coil is helical coil structure, is used for producing in metal specimen and receiving bulk wave; Described refinement layer is positioned at electromagnetic acoustic bulk wave transducer winding below metal specimen to be measured; Described defective is cylindrical defective, is positioned at bottom metal specimen to be measured;
The detailed process of described method for designing is:
Step 1: the needed parameter of definition modeling, wherein major parameter comprises diameter d and the height h of permanent magnet, the spacing a of wire in the electromagnet ultrasonic changer coil, width w and number of turn n;
Step 2: set up the geometric model comprise permanent magnet, electromagnet ultrasonic changer coil, metal specimen, refinement layer, defective and air far field;
Step 3: set material properties; Permanent magnet is set as magnetic material; The electromagnet ultrasonic changer coil is set as enameled wire; Metal specimen is set as metal material to be measured; Refinement layer is set as metal material to be measured; Defective and air far field are set as air;
Step 4: divide the physical field Domain; Described physical field comprises that electromagnet ultrasonic changer transmits and receives two physical fields---structure field and the electromagnetic field that relates in process; Described structure field Domain comprises metal specimen and refinement layer; Described electromagnetic field Domain comprises permanent magnet, electromagnetic acoustic bulk wave transducer winding, metal specimen, refinement layer, defective and air far field;
Step 5: emission process modeling; The initial magnetic vector potential of described electromagnetic field Domain is 0; Described structure field Domain initial displacement and initial velocity are 0; Described permanent magnet magnetic field direction is vertical direction; Described electromagnetic acoustic bulk wave transducer receiving coil passes into the Tone-Burst signal of certain frequency; Described refinement layer is the physical load applying zone of structure field, and physical load is the Lorentz force that Electromagnetic Calculation obtains;
Step 6: receiving course modeling; The initial magnetic vector potential of described electromagnetic field Domain is 0; Described structure field Domain initial displacement and initial velocity are 0; Described permanent magnet magnetic field direction is vertical direction; Described refinement layer is the velocity response zone of electromagnetic field, and namely the ultrasonic vibration cutting magnetic line of structure field induces voltage signal in electromagnetic acoustic bulk wave transducer winding;
Step 7: finite element meshing; The ultrasonic bulk wave transducer winding of described permanent magnet electromagnetic, metal specimen, refinement layer, defective and air far field employing tetrahedron element carry out subnetting; Carry out mesh refinement during described refinement layer subnetting, increase the model computational accuracy;
Step 8: finite element solving; Described structure field and electromagnetic field adopt finite element method, calculate the induced voltage signal that causes in eddy current, Lorentz force, ultrasound wave distribution and the electromagnetic acoustic bulk wave transducer winding in metal specimen;
Step 9: the diameter d and the height h that change permanent magnet, the spacing a of wire in the electromagnet ultrasonic changer coil, width w and number of turn n, the electromagnetic acoustic bulk wave transducer of setting up different parameters transmits and receives the process complete model, and finds the solution the induced voltage signal that causes in electromagnetic acoustic bulk wave transducer winding;
Step 10: the relation of induced voltage signal intensity and acoustic wave mode purity in acquisition electromagnetic acoustic bulk wave transducer major parameter and electromagnetic acoustic bulk wave transducer winding;
Step 11: find out the key parameter that affects induced voltage signal intensity and acoustic wave mode purity in electromagnetic acoustic bulk wave transducer winding from the relation that step 10 provides, calculate the strongest and acoustic wave mode of electromagnetic acoustic bulk wave transducer signal transducer parameters when optimum, electromagnetic acoustic bulk wave transducer is designed.
The invention has the beneficial effects as follows:
The ultrasonic bulk wave transducer designs of a kind of electromagnet of the present invention method transmits and receives the process complete basis that is modeled as with electromagnetic acoustic bulk wave transducer, finally realizes the design of electromagnetic acoustic bulk wave transducer; Electromagnetic acoustic bulk wave transducer of the present invention transmits and receives the complete modeling of process and contains electromagnetic field and structure field, the description that the electromagnet ultrasonic changer course of work is accurate complete out, and modeling process is simple, can change flexibly electromagnetic acoustic bulk wave transducer parameters, induced voltage signal in electromagnetic acoustic bulk wave transducer winding 2 under calculating different parameters condition; Electromagnetic acoustic bulk wave transducer designs of the present invention can be analyzed the relation of induced voltage signal intensity and acoustic wave mode purity in electromagnetic acoustic bulk wave transducer parameters and electromagnetic acoustic bulk wave transducer winding 2, calculate the strongest and acoustic wave mode of electromagnetic acoustic bulk wave transducer signal transducer parameters when optimum, realize electromagnetic acoustic bulk wave transducer designs.The ultrasonic bulk wave transducer designs of a kind of electromagnet method that the present invention proposes has simple to operate, and is easy to analyze electromagnetic acoustic bulk wave transducer parameters to the characteristics of induced voltage signal impact.The present invention can be widely used in the Finite element design of any electromagnetic acoustic bulk wave transducer.
Description of drawings
Fig. 1 is the model schematic diagram of realizing the ultrasonic bulk wave transducer designs of the described a kind of electromagnet of the application method; Fig. 2 is the structural representation of electromagnetic acoustic bulk wave transducer winding 2, in figure * the vertical paper of expression current direction is inside, and the vertical paper of expression current direction is outside; 2-1 is respectively two groups of identical wire combinations of current direction with 2-2; Fig. 3 is the Tone-Burst signal schematic representation that electromagnetic acoustic bulk wave transducer winding 2 passes into; Fig. 4 is the induced voltage signal that in embodiment two, electromagnetic acoustic bulk wave transducer winding 2 receives; Fig. 5 is the impact of parameter analysis phase different conductor width w on the reception induced voltage in embodiment two.
Embodiment
Embodiment one: present embodiment is described in conjunction with Fig. 1 and Fig. 2, the described a kind of novel electromagnetic acoustic bulk wave transducer modeling and optimization method for designing of present embodiment, realize that described method for designing need to transmit and receive process to electromagnetic acoustic bulk wave transducer and carry out complete modeling, the accurate description electromagnetic acoustic bulk wave transducer course of work, analyze the impact that ripple signal intensity and acoustic wave mode purity are regained in different transducer parameters docking, thereby obtain the transducer parameters combination of performance parameter optimum, electromagnetic acoustic bulk wave transducer is designed; Described model mainly comprises permanent magnet 1, electromagnet ultrasonic changer coil 2, metal specimen to be measured 3, refinement layer 4, defective 5 and air far field 6; Described permanent magnet 1 is cylindrical permanent magnet; Described electromagnet ultrasonic changer coil 2 is helical coil structure, is used for producing in metal specimen 3 and receiving bulk wave; Described refinement layer 4 is positioned at electromagnetic acoustic bulk wave transducer winding 2 below metal specimen 3 to be measured; Described defective 5 is cylindrical defective, is positioned at metal specimen to be measured 3 bottoms;
The ultrasonic bulk wave transducer designs of described a kind of electromagnet process is completed by following steps:
Step 1: the needed parameter of definition modeling, wherein major parameter comprises diameter d and the height h of permanent magnet 1, the spacing a of wire in electromagnet ultrasonic changer coil 2, width w and number of turn n;
Step 2: set up the geometric model comprise permanent magnet 1, electromagnet ultrasonic changer coil 2, metal specimen 3, refinement layer 4, defective 5 and air far field 6;
Step 3: set material properties; Permanent magnet 1 is set as magnetic material; Electromagnet ultrasonic changer coil 2 is set as enameled wire; Metal specimen 3 is set as metal material to be measured; Refinement layer 4 is set as metal material to be measured; Defective 5 and air far field 6 are set as air;
Step 4: divide the physical field Domain; Described physical field comprises that electromagnet ultrasonic changer transmits and receives two physical fields---structure field and the electromagnetic field that relates in process; Described structure field Domain comprises metal specimen 3 and refinement layer 4; Described electromagnetic field Domain comprises permanent magnet 1, electromagnetic acoustic bulk wave transducer winding 2, metal specimen 3, refinement layer 4, defective 5 and air far field 6;
Step 5: emission process modeling; The initial magnetic vector potential of described electromagnetic field Domain is 0; Described structure field Domain initial displacement and initial velocity are 0; Described permanent magnet 1 magnetic direction is vertical direction; Described electromagnetic acoustic bulk wave transducer receiving coil 2 passes into the Tone-Burst signal of certain frequency; Described refinement layer 4 is the physical load applying zone of structure field, and physical load is the Lorentz force that Electromagnetic Calculation obtains;
Step 6: receiving course modeling; The initial magnetic vector potential of described electromagnetic field Domain is 0; Described structure field Domain initial displacement and initial velocity are 0; Described permanent magnet 1 magnetic direction is vertical direction; The velocity response zone that described refinement layer 4 is electromagnetic field, namely the ultrasonic vibration cutting magnetic line of structure field induces voltage signal in electromagnetic acoustic bulk wave transducer winding 2;
Step 7: finite element meshing; Described permanent magnet 1, electromagnetic acoustic bulk wave transducer winding 2, metal specimen 3, refinement layer 4, defective 5 and air far field 6 adopt tetrahedron elements to carry out subnetting; Carry out mesh refinement during described refinement layer 4 subnetting, increase the model computational accuracy;
Step 8: finite element solving; Described structure field and electromagnetic field adopt finite element method, calculate the induced voltage signal that causes in eddy current, Lorentz force, ultrasound wave distribution and the electromagnetic acoustic bulk wave transducer winding 2 in metal specimen 3;
Step 9: the diameter d and the height h that change permanent magnet 1, the spacing a of wire in electromagnet ultrasonic changer coil 2, width w and number of turn n, the electromagnetic acoustic bulk wave transducer of setting up different parameters transmits and receives the process complete model, and finds the solution the induced voltage signal that causes in electromagnetic acoustic bulk wave transducer winding 2;
Step 10: the relation of induced voltage signal intensity and acoustic wave mode purity in analysis electromagnetic acoustic bulk wave transducer major parameter and electromagnetic acoustic bulk wave transducer winding 2; Induced voltage signal intensity and acoustic wave mode purity are the indexs of electromagnetic acoustic bulk wave transducer; Electromagnetic acoustic bulk wave transducer major parameter is influential to these two indexs;
Step 11: find out the key parameter (some parameter in electromagnetic acoustic bulk wave transducer major parameter) that affects induced voltage signal intensity and acoustic wave mode purity in electromagnetic acoustic bulk wave transducer winding 2, calculate the strongest and acoustic wave mode of electromagnetic acoustic bulk wave transducer signal transducer parameters when optimum, electromagnetic acoustic bulk wave transducer is designed.
Embodiment two: in present embodiment, in step 5, the frequency of the Tone-Burst signal of described certain frequency is 1～10MHz.Other step is identical with embodiment one.
Embodiment: in conjunction with Fig. 1 to Fig. 5, the present embodiment is described, the present embodiment is for adopting the specific embodiment of a kind of described novel electromagnetic acoustic bulk wave transducer designs method of embodiment one;
it is the cylindrical aluminium block of 45mm that metal specimen 3 adopts thickness, permanent magnet 1 adopts NdFeB material, with the distance of electromagnetic acoustic bulk wave transducer winding 2 be 1mm, the diameter d of permanent magnet 1 is 25mm, height h is 30mm, in electromagnet ultrasonic changer coil 2, the spacing a of wire is 1mm, width w is 0.5mm, number of turn n is 16, electromagnetic acoustic bulk wave transducer winding 2 is 0.5mm apart from the distance of metal specimen 3, defective 5 is highly 15mm, width is 2mm, distance model central axis distance is 2mm, it is 10A that electromagnetic acoustic bulk wave transducer winding 2 passes into Tone Burst current signal peak value, frequency is 2MHz, pulse width is 3.5 μ s.The described modeling and optimization method for designing of the application can obtain induced voltage signal in electromagnetic acoustic bulk wave transducer winding 2 by step 1 to step 8, as shown in Figure 4.Flaw echoes 8 and the end face echoed signal 9 that electromagnetic acoustic bulk wave transducer winding 2 receives after main impact signal 7 in Fig. 4.Change conductor width w in electromagnetic acoustic bulk wave transducer winding 2, obtain the variation of induced voltage in electromagnetic acoustic bulk wave transducer winding 2 by step 9 to step 11, as shown in Figure 5.Can get conductor width w and wire pitch a ratio is less from Fig. 5, the induced voltage amplitude is larger, so electromagnetic acoustic bulk wave transducer winding 2 should adopt the thin wire producing of trying one's best.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that concrete enforcement of the present invention is confined to these explanations.For this person of an ordinary skill in the technical field, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to the definite scope of patent protection of claims that the present invention submits to.
Claims (2)
1. electromagnetic acoustic bulk wave transducer designs method, described method for designing are based on that the transducer model that comprises permanent magnet (1), electromagnet ultrasonic changer coil (2), metal specimen to be measured (3), refinement layer (4), defective (5) and air far field (6) carries out; Described permanent magnet (1) is cylindrical permanent magnet; Described electromagnet ultrasonic changer coil (2) is helical coil structure, is used for producing in metal specimen (3) and receiving bulk wave; Described refinement layer (4) is positioned at electromagnetic acoustic bulk wave transducer winding (2) below metal specimen to be measured (3); Described defective (5) is cylindrical defective, is positioned at bottom metal specimen to be measured (3);
It is characterized in that: the detailed process of described method for designing is:
Step 1: the needed parameter of definition modeling, wherein major parameter comprises diameter d and the height h of permanent magnet (1), the spacing a of wire in electromagnet ultrasonic changer coil (2), width w and number of turn n;
Step 2: set up the geometric model that comprises permanent magnet (1), electromagnet ultrasonic changer coil (2), metal specimen (3), refinement layer (4), defective (5) and air far field (6);
Step 3: set material properties; Permanent magnet (1) is set as magnetic material; Electromagnet ultrasonic changer coil (2) is set as enameled wire; Metal specimen (3) is set as metal material to be measured; Refinement layer (4) is set as metal material to be measured; Defective (5) and air far field (6) are set as air;
Step 4: divide the physical field Domain; Described physical field comprises that electromagnet ultrasonic changer transmits and receives two physical fields---structure field and the electromagnetic field that relates in process; Described structure field Domain comprises metal specimen (3) and refinement layer (4); Described electromagnetic field Domain comprises permanent magnet (1), electromagnetic acoustic bulk wave transducer winding (2), metal specimen (3), refinement layer (4), defective (5) and air far field (6);
Step 5: emission process modeling; The initial magnetic vector potential of described electromagnetic field Domain is 0; Described structure field Domain initial displacement and initial velocity are 0; Described permanent magnet (1) magnetic direction is vertical direction; Described electromagnetic acoustic bulk wave transducer receiving coil (2) passes into the Tone-Burst signal of certain frequency; Described refinement layer (4) is the physical load applying zone of structure field, and physical load is the Lorentz force that Electromagnetic Calculation obtains;
Step 6: receiving course modeling; The initial magnetic vector potential of described electromagnetic field Domain is 0; Described structure field Domain initial displacement and initial velocity are 0; Described permanent magnet (1) magnetic direction is vertical direction; Described refinement layer (4) is the velocity response zone of electromagnetic field, and namely the ultrasonic vibration cutting magnetic line of structure field induces voltage signal in electromagnetic acoustic bulk wave transducer winding (2);
Step 7: finite element meshing; Described permanent magnet (1), electromagnetic acoustic bulk wave transducer winding (2), metal specimen (3), refinement layer (4), defective (5) and air far field (6) adopt tetrahedron element to carry out subnetting; Carry out mesh refinement during described refinement layer (4) subnetting, increase the model computational accuracy;
Step 8: finite element solving; Described structure field and electromagnetic field adopt finite element method, calculate the induced voltage signal that causes in eddy current, Lorentz force, ultrasound wave distribution and the electromagnetic acoustic bulk wave transducer winding (2) in metal specimen (3);
Step 9: the diameter d and the height h that change permanent magnet (1), the spacing a of wire in electromagnet ultrasonic changer coil (2), width w and number of turn n, the electromagnetic acoustic bulk wave transducer of setting up different parameters transmits and receives the process complete model, and finds the solution the induced voltage signal that causes in electromagnetic acoustic bulk wave transducer winding (2);
Step 10: the relation that obtains the middle induced voltage signal intensity of electromagnetic acoustic bulk wave transducer major parameter and electromagnetic acoustic bulk wave transducer winding (2) and acoustic wave mode purity;
Step 11: find out the key parameter that affects the middle induced voltage signal intensity of electromagnetic acoustic bulk wave transducer winding (2) and acoustic wave mode purity from the relation that step 10 provides, calculate the strongest and acoustic wave mode of electromagnetic acoustic bulk wave transducer signal transducer parameters when optimum, electromagnetic acoustic bulk wave transducer is designed.
2. a kind of electromagnetic acoustic bulk wave transducer designs method according to claim 1, it is characterized in that: in step 5, the frequency of the Tone-Burst signal of described certain frequency is 1～10MHz.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104122336A (en) * | 2014-07-16 | 2014-10-29 | 哈尔滨工业大学 | Electromagnetic ultrasonic surface wave transducer and design method thereof |
| CN108760899A (en) * | 2018-08-03 | 2018-11-06 | 广东工业大学 | Ultrasonic transducer model manufacturing method and device |
| CN110287617A (en) * | 2019-06-28 | 2019-09-27 | 中北大学 | A kind of design and relevant parameter method for solving of high power altrasonic transducer |
| CN112268954A (en) * | 2020-08-31 | 2021-01-26 | 北京工业大学 | L based on electromagnetic ultrasonic phased array sensorCRWave sound beam deflection regulating and controlling method |
| CN114101016A (en) * | 2021-11-04 | 2022-03-01 | 之江实验室 | Magnetic control flexible ultrasonic transducer |
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| CN101701810A (en) * | 2009-11-13 | 2010-05-05 | 哈尔滨工业大学 | Electromagnetic ultrasonic transducer capable of reducing echo of magnet |
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| CN101701810A (en) * | 2009-11-13 | 2010-05-05 | 哈尔滨工业大学 | Electromagnetic ultrasonic transducer capable of reducing echo of magnet |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122336A (en) * | 2014-07-16 | 2014-10-29 | 哈尔滨工业大学 | Electromagnetic ultrasonic surface wave transducer and design method thereof |
| CN108760899A (en) * | 2018-08-03 | 2018-11-06 | 广东工业大学 | Ultrasonic transducer model manufacturing method and device |
| CN108760899B (en) * | 2018-08-03 | 2021-01-29 | 广东工业大学 | Ultrasonic transducer model manufacturing method and device |
| CN110287617A (en) * | 2019-06-28 | 2019-09-27 | 中北大学 | A kind of design and relevant parameter method for solving of high power altrasonic transducer |
| CN110287617B (en) * | 2019-06-28 | 2022-09-27 | 中北大学 | Design of high-power ultrasonic transducer and related parameter solving method |
| CN112268954A (en) * | 2020-08-31 | 2021-01-26 | 北京工业大学 | L based on electromagnetic ultrasonic phased array sensorCRWave sound beam deflection regulating and controlling method |
| CN114101016A (en) * | 2021-11-04 | 2022-03-01 | 之江实验室 | Magnetic control flexible ultrasonic transducer |
| CN114101016B (en) * | 2021-11-04 | 2022-08-23 | 之江实验室 | Magnetic control flexible ultrasonic transducer |
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