CN211086570U - Ultra-low temperature giant magnetostrictive material force magnetic characteristic measuring device - Google Patents
Ultra-low temperature giant magnetostrictive material force magnetic characteristic measuring device Download PDFInfo
- Publication number
- CN211086570U CN211086570U CN201920898101.3U CN201920898101U CN211086570U CN 211086570 U CN211086570 U CN 211086570U CN 201920898101 U CN201920898101 U CN 201920898101U CN 211086570 U CN211086570 U CN 211086570U
- Authority
- CN
- China
- Prior art keywords
- force
- sample
- measuring
- magnetostrictive material
- giant magnetostrictive
- 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.)
- Active
Links
Images
Landscapes
- Measuring Magnetic Variables (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model provides a device for measuring the force and magnetic properties of giant magnetostrictive material at ultra-low temperature, which comprises a bearing platform, an electromagnet, a heat preservation box body and a pressurizing device; a thick-wall copper pipe is arranged inside the heat preservation box body; a sample to be measured is placed in a thick-wall copper tube, and the sample is an upper aluminum cap, a lower aluminum cap and a GMM material clamped and fixed by the upper aluminum cap and the lower aluminum cap; the upper surface of the pressure lever is connected with a pressurizing device, and a displacement sensor is arranged on the pressurizing device; the sample is adhered with the fiber bragg grating; on one hand, the provided experimental device can provide a controllable force magnetic coupling field environment at a low temperature, and an experimental platform designed aiming at the characteristics of the GMM material can effectively measure the force magnetic characteristics of the GMM material, and on the other hand, the device uses fiber bragg gratings to measure the magnetic strain and is assisted with the traditional micro-displacement sensing.
Description
Technical Field
The utility model belongs to the technical field of observing and controlling, a many field loads of low temperature power-magnetism-heat apply the device field, especially relate to a super magnetostrictive material power magnetic characteristic measuring device under ultra-low temperature.
Background
Giant Magnetostrictive Materials (GMMs) have been emerging and have gained widespread attention for their large magnetostrictive strain in magnetic fields. Researchers develop high-precision and high-energy-density components such as magnetic control actuators, magnetic field sensors, energy conversion and the like by utilizing the magnetic-force conversion principle. The giant magnetostrictive material has excellent force-magnetic characteristics at normal temperature, stable deformation output can be obtained by applying a certain magnetic field, the deformation of the giant magnetostrictive material is not weakened but increased under the action of an external load, and the complex nonlinear characteristics of the GMM under a force-magnetic coupling field make the research and analysis, system design and application behaviors of the GMM under a multi-field coupling environment more complex. After years of research by scholars, GMM materials have more research results within the temperature range of-50 to 200 ℃, and theoretical models are mature.
However, under the ultra-low temperature region, the research report about the GMM force-magnetic characteristics at home and abroad is almost zero. As an effective magnetic control mechanical element and a sensing element, the force magnetic characteristics at low temperature are very interesting. The development of actuators, ultra-low temperature magnetic field sensors and other devices in ultra-low temperature environment depends on the material properties of GMM at low temperature.
In an ultra-low temperature device, whether an actuator developed based on GMM has the same execution force at normal temperature or not needs to be effectively tested for the force magnetic characteristics of the GMM material in a low-temperature environment. However, the research on the low-temperature force magnetic characteristics of the GMM material is quite deficient at present, and the low-temperature actuator and the magnetic field sensor developed for the GMM are almost zero.
SUMMERY OF THE UTILITY MODEL
To above defect, the utility model provides a can provide controllable power magnetic coupling field environment at the low temperature, can measure GMM material power magnetic characteristic's measuring device effectively to the experimental platform of GMM material characteristics design.
The utility model relates to a super magnetostrictive material power magnetic characteristic measuring device's technical scheme under ultra-low temperature does: the device sequentially comprises a bearing table, an electromagnet, a heat preservation box body and a pressurizing device from bottom to top; the electromagnet is positioned on the bearing table; the middle of the electromagnet is a hollow cylinder, and cushion blocks are arranged below the hollow cylinder and above the bearing table; a heat preservation box body is arranged in the hollow cylinder and above the cushion block; the electromagnet tightly surrounds the lower part of the heat preservation box body; when the device is used for measurement, refrigerating liquid is added into the heat preservation box body; a thick-wall copper pipe is arranged inside the heat preservation box body; a sample to be measured is placed in the thick-wall copper pipe, and the sample to be measured is placed in the thick-wall copper pipe, wherein the sample is an upper aluminum cap, a lower aluminum cap and a GMM material clamped and fixed by the upper aluminum cap and the lower aluminum cap; the lower end aluminum cap of the sample is contacted with the cushion block, and the upper end aluminum cap of the sample is contacted with the pressure rod; the upper surface of the pressure lever is connected with a pressurizing device, and a displacement sensor is arranged on the pressurizing device; the sample is adhered with the fiber bragg grating; the electromagnet is also connected with a programmable power supply, the current output of the electromagnet is controlled by a program, so that the size and the waveform of a magnetic field are controlled, and signals are transmitted to the acquisition card in real time; the acquisition card acquires a real-time current signal provided by the programmable power supply, is connected with the computer, and performs digital-to-analog conversion for the computer to process; the fiber grating demodulator is used for demodulating the wavelength drift of the fiber grating, is connected with the computer and outputs signals in real time; the fiber bragg grating strain sensing signal attached to the sample is transmitted to a fiber bragg grating demodulator, so that multiple groups of signals can be transmitted simultaneously; and the computing terminal collects, processes, plots and stores the wavelength data and the magnetic field data provided by the fiber grating demodulator and the acquisition card in real time to obtain a reliable experimental result.
Further, the device for measuring the force and magnetic properties of the giant magnetostrictive material at the ultralow temperature is characterized in that the heat insulation box is large at the upper part and small at the lower part.
Further, the device for measuring the force and magnetic characteristics of the giant magnetostrictive material at the ultralow temperature is characterized in that the refrigerating liquid is liquid nitrogen.
Further, the device for measuring the force and magnetic characteristics of the giant magnetostrictive material at the ultralow temperature is characterized in that a copper pipe opening is formed in the thick-wall copper pipe, and the refrigerating liquid flows into the copper pipe through the opening.
Further, the device for measuring the force and magnetic properties of the giant magnetostrictive material at the ultralow temperature comprises weights and a weight tray for placing the weights; the weight tray is directly connected with the pressure rod; the displacement sensor is positioned on the weight tray.
Further, the displacement sensor is a contact dial indicator and/or a non-contact laser displacement sensor.
Furthermore, the compression bar and the cushion block are made of G10 materials.
Further, the device for measuring the force-magnetic characteristics of the giant magnetostrictive material at the ultralow temperature uses low-temperature glue to adhere the fiber grating and the GMM material.
Further, the super magnetostrictive material power magnetic characteristic measuring device under ultra-low temperature, the sample survey the face and sets up and pastes the groove, fiber grating pastes paste in the groove.
Further, the end of the aluminum cap is hemispherical.
The utility model has the advantages that: on one hand, the provided experimental device can provide a controllable force magnetic coupling field environment at a low temperature, and an experimental platform designed aiming at the characteristics of the GMM material can effectively measure the force magnetic characteristics of the GMM material; and on the other hand, the measurement of the magnetic strain is carried out by using the fiber grating, and meanwhile, the traditional micro-displacement sensing is assisted. Because the magnetic field interference exists in the test environment, the traditional electric measurement method loop is interfered by the magnetic field, and the measurement of electric signals can be influenced to a great extent, so the fiber bragg grating is selected as strain sensing, and the scheme of using a strain gauge is abandoned. The fiber bragg grating is used as a novel strain sensing device, and the change of the external physical quantity is sensed by analyzing the change of the reflection wavelength by utilizing the Bragg effect in the optical fiber. Compared with an electrical sensing device, the sensor has the remarkable advantages of electromagnetic immunity, corrosion resistance, small volume, small loss and the like, and is widely applied as a deformation sensing element in narrow extreme environments.
Drawings
Fig. 1 is a schematic structural diagram of a device for measuring the force-magnetic characteristics of an ultra-low temperature giant magnetostrictive material of the present invention;
fig. 2 is a schematic diagram of a test sample in the giant magnetostrictive material force magnetic characteristic measuring device under ultra-low temperature of the present invention;
FIG. 3 is a schematic cross-sectional view of a test sample in an apparatus for measuring the force-magnetic properties of an ultra-low temperature giant magnetostrictive material.
Wherein, 1 bearing platform, 2 cushion, 3 samples, 4 electro-magnets, 5 depression bars, 6 insulation box, 7 copper pipe openings, 8 thick wall copper pipes, 9 weight trays, 10 weights, 11 displacement sensor, 12 lower aluminum caps, 13GMM material, 14 upper aluminum caps, 15 pasting grooves.
Detailed Description
The technical solution of the present invention is further described below with reference to the accompanying drawings.
As shown in figure 1, the device for measuring the force-magnetic characteristics of the giant magnetostrictive material at the ultralow temperature sequentially comprises a bearing platform 1, an electromagnet 4, a heat preservation box 6 and a pressurizing device from bottom to top; the electromagnet 4 is positioned on the bearing table 1; the middle of the electromagnet 4 is a hollow cylinder, and a cushion block 2 is arranged below the hollow cylinder and above the bearing table 1; a heat preservation box body 6 is arranged in the hollow cylinder and above the cushion block 2; the electromagnet 4 tightly surrounds the lower part of the heat preservation box body 6; when the device is used for measurement, refrigerating liquid is added into the heat preservation box body 6; a thick-wall copper pipe 8 is arranged inside the heat preservation box body 6; a sample 3 to be measured is placed in the thick-wall copper pipe 8, the sample 3 to be measured is placed in the thick-wall copper pipe 8, and the sample 3 is an upper aluminum cap 12, a lower aluminum cap 12 and a GMM material 13 clamped and fixed by the upper aluminum cap and the lower aluminum cap; the lower end aluminum cap of the sample 3 is contacted with the cushion block 2, and the upper end aluminum cap of the sample 3 is contacted with the pressure rod 5; a pressurizing device is connected to the upper surface of the pressure lever 5, and a displacement sensor 11 is arranged on the pressurizing device; the sample 3 is adhered with the fiber grating; the electromagnet 4 is also connected with a programmable power supply, and the current output of the electromagnet is controlled by a program, so that the size and the waveform of a magnetic field are controlled, and signals are transmitted to the acquisition card in real time; the acquisition card acquires a real-time current signal provided by the programmable power supply, is connected with the computer, and performs digital-to-analog conversion for the computer to process; the fiber grating demodulator is used for demodulating the wavelength drift of the fiber grating, is connected with the computer and outputs signals in real time; the fiber bragg grating strain sensing signal attached to the sample 3 is transmitted to a fiber bragg grating demodulator, so that multiple groups of signals can be transmitted simultaneously; and the computing terminal collects, processes, plots and stores the wavelength data and the magnetic field data provided by the fiber grating demodulator and the acquisition card in real time to obtain a reliable experimental result.
In order to facilitate the refrigerant liquid to enter the bottom of the heat preservation box body 6 and preserve heat, the shape of the heat preservation box body 6 is designed to be that the upper part is larger and the lower part is smaller; the box body made of materials with good heat insulation such as EPP foamed plastics can isolate the external temperature to a certain extent so as to slow down the volatilization of the refrigerating fluid, keep the low-temperature state for a long time and reduce the use of the coolant.
The method shown in the figure is characterized in that refrigerating liquid, but not limited to liquid nitrogen specified in the figure, can be refrigerating liquid in other forms to meet specific temperature requirements, certain heat preservation measures are adopted to keep the ambient temperature stable, and errors of strain measurement are reduced.
The utility model discloses the thick wall copper pipe 8 of chooseing for use is one of very critical component, and the copper pipe is non-magnetic material on the one hand, can not influence background magnetic field applying the magnetic field in-process, and secondly the copper pipe has good heat conductivity, easily realizes the even transmission of temperature, guarantees test environment temperature's stability. On the other hand, the copper pipe is used as a component for restraining the G10 pressure lever 5, so that the verticality is guaranteed, and the weight 10 is prevented from deviating and turning on the side.
Be provided with copper pipe opening 7 on thick wall copper pipe 8, this opening is direct to link up with low temperature container with copper intraduct for in refrigeration liquid can flow into the copper pipe, guarantee that test sample 3 can obtain good cooling.
In this embodiment, the weight 10 is selected as the mechanical loading scheme, which has obvious advantages. Weight 10 can provide stable vertical pressure load, and the convenient increase and decrease operation of accessible changes the load. Compared with a universal tester, the load of the test device is not delayed along with deformation, the test device is very critical to the application of stable load, and a stable force field environment is provided for the research of GMM force magnetic characteristics at low temperature. The weight 10 is placed on the weight tray 9; weight tray 9 is used for placing weight 10, links to each other with lower part depression bar 5 is direct, for avoiding the tie point to damage, does necessary enhancement in the junction because the weight load that applys in the experimentation is very big.
The displacement sensor 11 is positioned on the weight tray 9 and used as an auxiliary device for deformation measurement of the fiber bragg grating, and can monitor the total expansion and contraction quantity of materials in the magneto-dynamic process and calculate the average strain. The device can select a contact dial indicator or a displacement measuring device with higher precision such as a non-contact laser displacement sensor 11 and the like, can be a single displacement sensor 11 or a plurality of displacement sensors 11, and mutually checks the obtained results.
In this embodiment, the material of the pressing rod 5 and the cushion block 2 is G10 material. The compression bar 5 directly transmits the pressure load applied by the weight 10 to the test sample 3, and the material G10 is selected. The G10 material still has excellent mechanical property at ultralow temperature, higher strength, difficult brittle failure, good heat insulation and no magnetism, and avoids interfering a background magnetic field.
As shown in fig. 2, the test specimen 3 is composed of upper and lower aluminum caps holding a segment of cylindrical GMM material 13, and in order to prevent the material from being pressed eccentrically during the pressing process, which results in uneven internal pressure, the end of the aluminum cap is designed to be hemispherical. Meanwhile, the side surface of the columnar GMM sample 3 is provided with an optical fiber pasting groove 15, and as shown in figure 3, the optical fiber is firmly pasted therein. And adhering the fiber grating and the GMM material 13 by using low-temperature glue to realize strain sensing.
In addition, the bearing platform 1 is used for bearing all heavy objects on the upper portion of the bearing platform, and is required to be horizontal, nonmagnetic and good in heat insulation.
The utility model relates to a super magnetostrictive material power magnetic characteristic measuring device does at the work flow who measures GMM material magnetic characteristic under the ultra-low temperature.
S1, properly connecting the fiber grating demodulator, the computer, the acquisition card and the programmable power supply, and finishing debugging;
and S2, accessing the optical fiber into the fiber grating demodulator, and checking whether the wavelength is normal. And finding out the conversion coefficient of the wavelength drift and the dependent variable, which is usually provided by a manufacturer;
s3, properly connecting the programmable power supply with the electromagnet 4, calibrating the corresponding relation between current and a magnetic field by a gaussmeter before an experiment, and finding a conversion coefficient;
s4, slowly injecting cooling liquid (such as liquid nitrogen), observing the temperature reduction pattern of the fiber grating, so that the whole device gradually enters a low-temperature state, the process is not suitable to be too violent, and the temperature should be reduced slowly. Cooling liquid flows into the copper pipe through the copper pipe opening 7, the sample 3 is gradually cooled, the liquid can be boiled in the process, and after the temperature is stable and the boiling is stopped, an experiment can be started;
s5 and the upper weight 10 are applied according to experimental requirements, pressure values only need to be calculated under different loads, and the upper weight is lightly held in the process so as to avoid over-rush impact and damage to the sample 3 or the device.
And S6, starting the acquisition program after the preparation of each link is finished, automatically starting the power supply by the computer, acquiring corresponding data, automatically acquiring in the whole process, stopping after the addition and the unloading are finished for a plurality of times, and automatically storing the data in a specific folder.
In the actual working process, the acquisition program in the computer controls the power supply on one hand and carries out real-time signal acquisition on the other hand, so that the automation of the test process is realized.
Claims (10)
1. The utility model provides a super magnetostrictive material power magnetic property measuring device under ultra-low temperature which characterized in that: the device sequentially comprises a bearing table, an electromagnet, a heat preservation box body and a pressurizing device from bottom to top;
the electromagnet is positioned on the bearing table; the middle of the electromagnet is a hollow cylinder, and cushion blocks are arranged below the hollow cylinder and above the bearing table;
a heat preservation box body is arranged in the hollow cylinder and above the cushion block; the electromagnet tightly surrounds the lower part of the heat preservation box body;
when the device is used for measurement, refrigerating liquid is added into the heat preservation box body;
a thick-wall copper pipe is arranged inside the heat preservation box body;
a sample to be measured is placed in a thick-wall copper tube, and the sample is an upper aluminum cap, a lower aluminum cap and a GMM material clamped and fixed by the upper aluminum cap and the lower aluminum cap;
the lower end aluminum cap of the sample is contacted with the cushion block, and the upper end aluminum cap of the sample is contacted with the pressure rod;
the upper surface of the pressure lever is connected with a pressurizing device, and a displacement sensor is arranged on the pressurizing device;
the sample is adhered with the fiber bragg grating;
the electromagnet is also connected with a programmable power supply, the current output of the electromagnet is controlled by a program, so that the size and the waveform of a magnetic field are controlled, and signals are transmitted to the acquisition card in real time;
the acquisition card acquires a real-time current signal provided by the programmable power supply, is connected with the computer, and performs digital-to-analog conversion for the computer to process;
the fiber grating demodulator is used for demodulating the wavelength drift of the fiber grating, is connected with the computer and outputs signals in real time;
the fiber bragg grating strain sensing signal attached to the sample is transmitted to a fiber bragg grating demodulator, so that multiple groups of signals can be transmitted simultaneously;
and the computing terminal collects, processes, plots and stores the wavelength data and the magnetic field data provided by the fiber grating demodulator and the acquisition card in real time to obtain a reliable experimental result.
2. The device for measuring the force-magnetic property of the giant magnetostrictive material at the ultralow temperature according to claim 1, characterized in that: the shape of the heat preservation box is that the upper part is big and the lower part is small.
3. The device for measuring the force-magnetic property of the giant magnetostrictive material at the ultralow temperature according to claim 1, characterized in that: the refrigerating liquid is liquid nitrogen.
4. The device for measuring the force-magnetic property of the giant magnetostrictive material at the ultralow temperature according to claim 1, characterized in that: the thick-wall copper pipe is provided with a copper pipe opening, and the refrigerating liquid flows into the copper pipe through the pass opening.
5. The device for measuring the force-magnetic property of the giant magnetostrictive material at the ultralow temperature according to claim 1, characterized in that: the pressurizing device is a weight and a weight tray for placing the weight; the weight tray is directly connected with the pressure rod; the displacement sensor is positioned on the weight tray.
6. The device for measuring the force-magnetic property of the giant magnetostrictive material at the ultralow temperature according to any one of claims 1 and 5, characterized in that: the displacement sensor is a contact dial indicator and/or a non-contact laser displacement sensor.
7. The device for measuring the force-magnetic property of the giant magnetostrictive material at the ultralow temperature according to claim 1, characterized in that: the material of the pressure lever and the cushion block is G10 material.
8. The device for measuring the force-magnetic property of the giant magnetostrictive material at the ultralow temperature according to claim 1, characterized in that: and adhering the fiber grating and the GMM material by using low-temperature glue.
9. The device for measuring the force-magnetic property of the giant magnetostrictive material at the ultralow temperature according to any one of claims 1 and 8, characterized in that: the sample measuring surface is provided with a pasting groove, and the fiber bragg grating is pasted in the pasting groove.
10. The device for measuring the force-magnetic property of the giant magnetostrictive material at the ultralow temperature according to claim 1, characterized in that: the end of the aluminum cap is hemispherical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920898101.3U CN211086570U (en) | 2019-06-14 | 2019-06-14 | Ultra-low temperature giant magnetostrictive material force magnetic characteristic measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920898101.3U CN211086570U (en) | 2019-06-14 | 2019-06-14 | Ultra-low temperature giant magnetostrictive material force magnetic characteristic measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211086570U true CN211086570U (en) | 2020-07-24 |
Family
ID=71622706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920898101.3U Active CN211086570U (en) | 2019-06-14 | 2019-06-14 | Ultra-low temperature giant magnetostrictive material force magnetic characteristic measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211086570U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286341A (en) * | 2019-06-14 | 2019-09-27 | 兰州大学 | Giant magnetostrictive material power magnetic characteristic measuring device under a kind of ultralow temperature |
-
2019
- 2019-06-14 CN CN201920898101.3U patent/CN211086570U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286341A (en) * | 2019-06-14 | 2019-09-27 | 兰州大学 | Giant magnetostrictive material power magnetic characteristic measuring device under a kind of ultralow temperature |
| CN110286341B (en) * | 2019-06-14 | 2024-05-10 | 兰州大学 | Super magnetostriction material force magnetic characteristic measuring device under ultralow temperature |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103293184B (en) | Experimental device for testing heat conductivity coefficient of building material based on quasi steady state and unsteady state methods | |
| CN110286341B (en) | Super magnetostriction material force magnetic characteristic measuring device under ultralow temperature | |
| CN103063145B (en) | Multifunctional intelligent type laser speckle interference measuring device and method | |
| CN202794074U (en) | High temperature superconduction temperature transition measuring device based upon cryogenic refrigerator | |
| CN102798575A (en) | Large-scale multifunctional frozen soil-composition contact surface cycle direct shear apparatus and test operation method | |
| CN102507725B (en) | Measuring device and measuring method of superconductive AC magnetic susceptibility | |
| CN108344642B (en) | Creep experiment device based on gravity loading three-point bending and testing method | |
| CN211086570U (en) | Ultra-low temperature giant magnetostrictive material force magnetic characteristic measuring device | |
| CN103592195A (en) | Machine and method for slight impact wear test on nuclear power station steam generator heat-transfer pipe | |
| CN203785953U (en) | Loading system of durability test of concrete sample | |
| Lai et al. | Stress relaxation of nonlinear viscoelastic material under uniaxial strain | |
| CN106802399A (en) | The measuring system and method for a kind of magnetostriction coefficient | |
| CN104035058A (en) | Device and method for parameter characteristic testing of magnetostrictive material | |
| CN106018062A (en) | Apparatus for testing mechanical properties of superconducting material in multiple environmental fields | |
| CN108896840A (en) | A kind of device and method of original position real-time measurement piezoelectric material high-temperature piezoelectric strain constant | |
| CN110501114A (en) | Three-dimensional force sensor Calibration of Dynamic device and method | |
| CN108508381B (en) | Magnetic characteristic measurement sensing box considering temperature loading | |
| CN204286937U (en) | A kind of carton checkout equipment | |
| CN103822668B (en) | The optical fiber Bragg raster low-temperature sensor of a kind of strain and temperature simultaneously measuring and using method thereof | |
| CN103149236A (en) | Low-temperature material linear expansion coefficient measuring method and low-temperature material linear expansion coefficient measuring device | |
| CN209123872U (en) | The device of dynamic monitoring deformation index under a kind of high-temperature and high-pressure conditions in reaction kettle | |
| CN109030568B (en) | Nondestructive testing device and method for critical current of high-temperature superconducting film | |
| CN100425977C (en) | Method for measuring polymer-base foam material linear expansion coefficient by displacement sensor | |
| CN203658188U (en) | Slight impact wear test device for heat transfer tube of steam generator of nuclear power plant | |
| CN112986874B (en) | Single-chip magnetic property measuring device based on space orthogonal triaxial stress loading condition |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |