CN112419823A - Stress and defect magnetic memory nondestructive testing virtual experiment teaching system and method - Google Patents
Stress and defect magnetic memory nondestructive testing virtual experiment teaching system and method Download PDFInfo
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- CN112419823A CN112419823A CN202011360923.XA CN202011360923A CN112419823A CN 112419823 A CN112419823 A CN 112419823A CN 202011360923 A CN202011360923 A CN 202011360923A CN 112419823 A CN112419823 A CN 112419823A
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 81
- 238000009659 non-destructive testing Methods 0.000 title claims abstract description 37
- 230000007547 defect Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims description 9
- 238000012360 testing method Methods 0.000 claims abstract description 33
- 238000009864 tensile test Methods 0.000 claims abstract description 21
- 238000002474 experimental method Methods 0.000 claims description 67
- 238000001514 detection method Methods 0.000 claims description 18
- 239000003302 ferromagnetic material Substances 0.000 claims description 14
- 239000000523 sample Substances 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000007405 data analysis Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000010223 real-time analysis Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 230000035515 penetration Effects 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
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- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
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- 230000003993 interaction Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B9/00—Simulators for teaching or training purposes
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Abstract
The stress and defect magnetic memory nondestructive testing virtual experiment teaching system comprises a VR integrated machine, wherein the VR integrated machine is connected with a computer platform through a wireless network, and the computer platform is connected with a data glove through a positioning sensor. Based on the electromagnetic theory and the force magnetic coupling mechanism, the invention develops a virtual cutting testing machine, a tensile test virtual machine and a magnetic memory nondestructive testing virtual operation display system, and is used for virtual experiment teaching of magnetic memory signals induced by complex defect morphology. According to the invention, boring classroom teaching contents are easier to accept by students through a virtual diversified expression form, the teaching quality is improved, the content interest is enhanced, and the learning efficiency is improved.
Description
Technical Field
The invention relates to the technical field of virtual development of VR (virtual reality) of a nondestructive testing technology, in particular to a stress and defect magnetic memory nondestructive testing virtual experiment teaching system and method.
Background
The magnetic signal detection method is a novel nondestructive detection method, and is used for detecting and evaluating the position and the size of a stress concentration area or a defect of a structure surface by utilizing the distortion of a magnetic signal of the structure surface. With the continuous development of the nondestructive testing career in China, the teaching of nondestructive testing experiments such as a magnetic memory method and the like gradually enters the classroom, and corresponding professional experimental instruments and equipment are indispensable to the development of teaching and scientific research in colleges and universities. However, the purchasing cost of the professional detection instrument is high, the requirement for students to participate in the experiment is large, and in addition, the professional equipment is difficult to maintain, the maintenance cost is high, professional instructors are lacked, and the like, so that the enthusiasm of the students to participate in the experiment learning is greatly reduced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a stress and defect magnetic memory nondestructive testing virtual experiment teaching system and method, and a virtual cutting testing machine, a tensile test virtual machine and a magnetic memory nondestructive testing virtual operation display system are developed on the basis of an electromagnetism theory and a force magnetic coupling mechanism. According to the invention, boring classroom teaching contents are easier to accept by students through a virtual diversified expression form, the teaching quality is improved, the content interest is enhanced, and the learning efficiency is improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
stress and defect magnetic memory nondestructive testing virtual experiment teaching system, including VR all-in-one machine 2, VR all-in-one machine 2 passes through the wireless network and is connected with computer platform 1, and computer platform 1 passes through positioning sensor and is connected with data gloves 3.
The data glove 3 is provided with a positioning sensor.
The computer platform 1 is a main platform, and a virtual cutting testing machine, a tensile test virtual machine, a magnetic memory nondestructive testing virtual operation display system 4 and a virtual magnetic memory signal real-time calculation program 5 on the surface of the ferromagnetic material are configured in the computer platform 1; the computer platform 1 is used for providing virtual cutting experiment scenes, experiment data analysis in a tensile test and virtual magnetic memory signal real-time analysis of the surface of the ferromagnetic material in magnetic memory nondestructive testing.
The virtual cutting testing machine, the tensile testing virtual machine and the magnetic memory nondestructive testing virtual operation display system 4 are used for providing a virtual cutting experiment of materials, a virtual tensile experiment and a virtual magnetic memory testing experiment of ferromagnetic materials; and the real-time calculation program 5 of the virtual magnetic memory signal on the surface of the ferromagnetic material is used for calculating the magnetic memory detection virtual signal obtained by the probe in real time according to the position of the magnetic memory nondestructive detection probe in the virtual scene, so as to realize the measurement of the magnetic memory detection virtual signal under different stresses and different defect types.
The VR integrated machine 2 is used for providing data, image, picture, sound and other transmission; the data glove 3 is combined with the VR integrated machine 2 to achieve the effect that hand actions are restored in a virtual experiment operation interface through wireless data transmission, and a sensor on the data glove 3 is used for accurately positioning the position of a hand in a three-dimensional space.
The virtual cutting testing machine, the tensile testing virtual machine and the magnetic memory nondestructive testing virtual operation display system 4 provide two modes when selecting a sample: a virtual component library mode and a virtual cutter mode.
The application method of the magnetic memory nondestructive testing virtual experiment teaching system for stress and defects,
comprises the following steps of;
step one, experiment preparation: an operator wears the VR integrated equipment 2 and the data gloves 3 to enter a virtual laboratory; an operator formulates an experimental operation scheme according to operation information prompted by the virtual operation interface; preparing and processing an experimental test piece, and selecting a test piece processing mode according to the requirement of an experimental target task;
step two, starting an experiment: carrying out a defect-containing tensile test experiment, and prompting an operator to carry out a virtual tensile experiment through a virtual operation interface according to a formulated experiment operation scheme; after the virtual stretching experiment is finished, an operator prompts the magnetic memory virtual detection experiment through a virtual operation interface according to the purpose of the experiment;
step three, ending the experiment: and the operator quits the virtual interface, the VR integrated equipment 2 and the data glove 3 are placed, and the experiment is finished.
The invention has the beneficial effects that:
the practicability of the invention is as follows:
the establishment of the experiment teaching system not only can provide core experiment teaching, but also can bear simulated scientific research of magnetic memory subjects of colleges and universities, provide practical operation of virtual experiment scenes supporting professional knowledge and skills, and better help schools to perform related scientific research activities combining disciplines and virtual simulation technology by matching virtual stretching experiments, magnetic memory detection experiments and other resource libraries in the system with the teaching outline of researchers;
the experiment teaching system can provide a more real three-dimensional display experiment simulation effect, realize man-machine interaction, provide super-strong invasion and realize multi-user sharing.
The operability of the invention is as follows:
compared with the traditional laboratory teaching, the experimental teaching system is more convenient and fast, the virtual cutting experiment, the stretching experiment and the magnetic signal detection can be realized in the virtual laboratory environment only by operating according to the operation information prompted by the computer platform in the experimental operation, and the operation steps are simple;
the experiment teaching system is simple in equipment installation, the VR integrated equipment and the data gloves are used for data transmission through a wireless network, extra power lines and synchronization lines are not needed, the installation is simple, meanwhile, the movement of experimenters is facilitated, and the phenomena of tripping and the like caused by overlong data lines or power lines are avoided;
the experiment teaching system platform overcomes the defect of experiment teaching caused by difficulty in manufacturing the defects of the prefabricated test piece, and facilitates students to detect the influence of different defect types on magnetic signals.
The safety of the invention is as follows:
this virtual teaching simulation experiment platform does not have experiment operation danger, and the security is high, can operate repeatedly and utilize, cultivates student's enjoyment, reaches the teaching purpose.
Drawings
Fig. 1 is a schematic diagram of a virtual teaching simulation experiment platform device integrated with VR.
FIG. 2 is a schematic diagram of a defect in a part of a virtual component library.
a) Surface cracks b) an elliptic cylinder penetration type c) a square penetration type d) an irregular hexahedron penetration type cross section is a trapezoid e) a rectangular penetration type f) a quadrangular pyramid penetration type g) a combination type penetration type.
FIG. 3 is a flow chart of the operation of the magnetic memory nondestructive testing virtual experiment teaching system for stress and defect.
FIG. 4 is a diagram of magnetic signals caused by different defects.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in the attached figure 1, the virtual experiment teaching system for the magnetic memory nondestructive testing of stress and defects provided by the invention comprises: the device comprises a computer platform 1, a VR (virtual reality) all-in-one machine 2, a data glove 3, a virtual cutting testing machine, a tensile test virtual machine, a magnetic memory nondestructive testing virtual operation display system 4 and a virtual magnetic memory signal real-time calculation program 5 on the surface of a ferromagnetic material.
The VR integrated machine 2 is connected with the computer platform 1 through a wireless network; the data glove 3 is provided with a positioning sensor which is connected with the computer platform 1 through a wireless network.
The computer platform 1 is used as a main platform, and a virtual cutting testing machine, a tensile test virtual machine, a magnetic memory nondestructive testing virtual operation display system 4 and a virtual magnetic memory signal real-time calculation program 5 on the surface of the ferromagnetic material are configured in the computer platform 1.
The computer platform 1 is used for providing virtual cutting experiment scenes, experiment data analysis in a tensile test and virtual magnetic memory signal real-time analysis of the surface of the ferromagnetic material in magnetic memory nondestructive testing.
The VR integrated machine 2 is used for providing data, image, picture, sound and other transmission; the data glove 3 is used for realizing hand action restoration in a virtual experiment operation interface through wireless data transmission in combination with the VR integrated machine 2, wherein a sensor on the data glove 3 is used for accurately positioning the hand in a three-dimensional space. The action of operating personnel hand in the simulation experiment, if grab the action such as object, place the object to show operating personnel's hand action in VR integration equipment.
The virtual cutting testing machine, the tensile testing virtual machine and the magnetic memory nondestructive testing virtual operation display system 4 are used for providing a virtual cutting experiment, a virtual tensile experiment and a virtual magnetic memory detection experiment of ferromagnetic materials.
The virtual cutting testing machine, the tensile testing virtual machine and the magnetic memory nondestructive testing virtual operation display system 4 comprise a ferromagnetic material surface virtual magnetic memory signal real-time calculation program 5 provided based on a force magnetic coupling constitutive theory and a magnetic memory micro magnetic signal calculation model.
The real-time calculation program 5 of the virtual magnetic memory signal on the surface of the ferromagnetic material is used for calculating the magnetic memory detection virtual signal obtained by the probe in real time according to the position of the magnetic memory nondestructive detection probe in the virtual scene, so that the magnetic memory detection virtual signal under different stresses and different defect types can be measured.
The computer platform 1 is provided with a virtual cutting testing machine, a tensile test virtual machine and a magnetic memory nondestructive testing virtual operation display system 4, and when a sample is selected, the system provides two modes: a virtual component library mode and a virtual cutter mode. Prefabricated components with different defect types are provided in the virtual component library, such as components with surface cracks, buried cracks, penetrating cracks and the like, and a schematic diagram of part of the components in the virtual component library is shown in FIG. 2; meanwhile, a virtual cutting machine mode is provided in the virtual display system, so that an operator can experience the real component cutting process, and different requirements of the operator are met.
As shown in FIG. 3, the experimental preparation process is described as follows:
step one, experiment preparation:
wearing virtual instrument equipment: an operator wears the VR integrated equipment 2 and the data gloves 3 according to the wearing requirement of the virtual equipment and enters a virtual laboratory;
a virtual experiment scheme is formulated: an operator enters an experimental window on an interface displayed in the VR integrated equipment according to operation information prompted by the virtual operation interface, and sets an experimental scheme;
preparing and processing an experimental test piece: the test piece processing mode can be selected according to the requirement of the self experiment target task. The operation interface provides two operation modes: virtual component library mode and virtual cutting machine mode: virtual component library mode: the virtual component library mode provides prefabricated components with different defect types, such as components with surface cracks, buried cracks, penetrating cracks and the like, and a schematic diagram of part of the components in the virtual component library is shown in FIG. 2; virtual cutting machine mode: the virtual cutting machine mode can select a basic defect reference type according to the prompted interface; selecting defect positions, size information, cutting processes and the like according to the interface prompt information, and then starting a virtual cutting machine to start cutting; and after the cutting is finished, closing the virtual cutting machine.
Step two, starting an experiment:
tensile test with defects experiment: when an operator prompts a virtual stretching experiment to be carried out through a virtual operation interface according to a formulated experiment operation scheme, the operator strictly follows the relevant operation information prompted by a computer platform: the method comprises the following steps of preparing a test piece, starting a tensile testing machine, adjusting the parallelism of an upper chuck and a lower chuck by using a spare part, avoiding the test piece from being subjected to torsion and load, installing the test piece to the testing machine, adjusting the position of a cross beam clamped in a clamp, adjusting the position of the cross beam by using a manual control box, adjusting the test piece to the position which can be correctly clamped by the lower clamp, ensuring that the test piece is vertically downward, eliminating clamping force and the like; starting the testing machine to perform a tensile test, clamping in a fixed direction every time of loading, gradually loading the test sample, and unloading after a preset load is reached; finally, taking the test piece down from the testing machine, closing the virtual testing machine, and then cutting off the virtual main power supply and other operations;
magnetic memory detection experiment: after the virtual stretching experiment is finished, an operator carries out a magnetic memory virtual detection experiment through a virtual operation interface according to the purpose of the experiment, and the operator needs to be far away from other ferromagnetic components during magnetic signal detection according to the operation prompt of a computer, and places a sample to be tested according to the same detection direction and position; an operator holds the virtual probe to detect a magnetic memory signal on the surface of the sample by wearing a data glove; after the measurement is finished, the magnetic field data is automatically led into a computer, and magnetic memory signal distribution results of the surfaces of the test pieces with different stresses and different defect types are output on the computer in real time, wherein schematic diagrams of magnetic signals caused by different defects are shown in FIG. 4; and (5) after the virtual experiment is finished, the operator closes the virtual real-time display equipment and the virtual magnetic memory signal detector and places the virtual probe.
Step three, ending the experiment:
and after the experiment is finished, the VR integrated machine and the data gloves are taken off by the operator and placed at the designated position.
According to the invention, a computer processes a series of two-dimensional images to obtain a three-dimensional virtual cutting experiment scene, a stretching experiment scene and a magnetic memory nondestructive testing scene, the scenes are displayed in a virtual environment, and students wear VR integrated machine equipment and data gloves to enter the virtual environment to carry out a virtual cutting experiment, a stretching experiment and a magnetic memory nondestructive testing experiment in an all-round and three-dimensional manner.
Claims (7)
1. Stress and defect magnetic memory nondestructive testing virtual experiment teaching system is characterized by comprising a VR integrated machine (2), wherein the VR integrated machine (2) is connected with a computer platform (1) through a wireless network, and the computer platform (1) is connected with a data glove (3) through a positioning sensor.
2. The system for teaching the stress and flaw magnetic memory nondestructive testing virtual experiment according to claim 1, wherein the data glove (3) is equipped with a positioning sensor.
3. The stress and defect magnetic memory nondestructive testing virtual experiment teaching system according to claim 1, characterized in that the computer platform (1) is a main platform, and a virtual cutting testing machine, a tensile testing virtual machine, a magnetic memory nondestructive testing virtual operation display system (4) and a virtual magnetic memory signal real-time calculation program (5) on the surface of the ferromagnetic material are configured in the computer platform (1); the computer platform (1) is used for providing virtual cutting experiment scenes, experiment data analysis in a tensile test and virtual magnetic memory signal real-time analysis of the surface of the ferromagnetic material in magnetic memory nondestructive testing.
4. The stress and defect magnetic memory nondestructive testing virtual experiment teaching system according to claim 3, wherein the virtual cutting testing machine, the tensile testing virtual machine and the magnetic memory nondestructive testing virtual operation display system (4) are used for providing virtual cutting experiments of materials, virtual tensile experiments and virtual magnetic memory testing experiments of ferromagnetic materials; and the real-time calculation program (5) of the virtual magnetic memory signal on the surface of the ferromagnetic material is used for calculating the magnetic memory detection virtual signal obtained by the probe in real time according to the position of the magnetic memory nondestructive detection probe in the virtual scene, so as to realize the measurement of the magnetic memory detection virtual signal under different stresses and different defect types.
5. The virtual experimental teaching system for magnetic memory nondestructive testing of stress and defect according to claim 3 characterized in that the virtual cutting test machine, the virtual machine for tensile test and the virtual operation display system for magnetic memory nondestructive testing (4) provide two modes when selecting a specimen sample: a virtual component library mode and a virtual cutter mode.
6. The virtual experiment teaching system for magnetic memory nondestructive testing of stress and defect according to claim 1, characterized in that the VR all-in-one machine (2) is used for providing data, image and sound transmission; the data glove (3) is combined with the VR integrated machine (2) and used for restoring hand actions in a virtual experiment operation interface through wireless data transmission, and a sensor on the data glove (3) is used for accurately positioning the hand in a three-dimensional space.
7. The use method of the magnetic memory nondestructive testing virtual experiment teaching system for stress and defect based on claim 1 is characterized by comprising the following operation steps;
step one, experiment preparation: an operator wears the VR integrated equipment (2) and the data gloves (3) to enter a virtual laboratory; an operator formulates an experimental operation scheme according to operation information prompted by the virtual operation interface; preparing and processing an experimental test piece, and selecting a test piece processing mode according to the requirement of an experimental target task;
step two, starting an experiment: carrying out a defect-containing tensile test experiment, and prompting an operator to carry out a virtual tensile experiment through a virtual operation interface according to a formulated experiment operation scheme; after the virtual stretching experiment is finished, an operator prompts the magnetic memory virtual detection experiment through a virtual operation interface according to the purpose of the experiment;
step three, ending the experiment: and the operator quits the virtual interface, the VR integrated equipment 2 and the data glove 3 are placed, and the experiment is finished.
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